Built-in Translator + ModalBottomSheet → CustomBottomSheet(fixes bugs) + Constants.NAVIGATION_ITEMS for NavigationBars + Various dependencies updates + ReleaseResponse → LatestReleaseInfo + Fixed: Modifier.clip did not apply correctly + Room Version Migration(cause of translator) + Changed order of the selection toolbar items(revert): Translate, Copy, Dictionary > Copy, Translate, Dictionary + Gradle Version Update 8.2 → 8.4 + StringWithId → LineWithTranslation + Less transparent bars color in ReaderScreen + Small localization changes (v1.0.1)

.idea/kotlinc.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="KotlinJpsPluginSettings">
-    <option name="version" value="1.9.21" />
+    <option name="version" value="2.0.0" />
   </component>
 </project>

app/build.gradle.kts

@@ -1,10 +1,13 @@
 plugins {
     id("com.android.application")
     id("org.jetbrains.kotlin.android")
+    id("org.jetbrains.kotlin.plugin.compose")
     id("com.google.devtools.ksp")
     id("com.google.dagger.hilt.android")
     id("kotlin-parcelize")
     id("com.mikepenz.aboutlibraries.plugin")
+    id("androidx.room")
+    id("org.jetbrains.kotlin.plugin.serialization")
 }
 
 android {
@@ -24,6 +27,10 @@ android {
         }
     }
 
+    room {
+        schemaDirectory("$projectDir/schemas")
+    }
+
     buildTypes {
         getByName("debug") {
             applicationIdSuffix = ".debug"
@@ -76,12 +83,12 @@ aboutLibraries {
 dependencies {
 
     // Default
-    implementation("androidx.core:core-ktx:1.13.0")
+    implementation("androidx.core:core-ktx:1.13.1")
-    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.7.0")
+    implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.8.1")
     implementation("androidx.activity:activity-compose:1.9.0")
 
     // Compose BOM libraries
-    implementation(platform("androidx.compose:compose-bom:2024.04.01"))
+    implementation(platform("androidx.compose:compose-bom:2024.05.00"))
     implementation("androidx.compose.foundation:foundation")
     implementation("androidx.compose.animation:animation")
     implementation("androidx.compose.animation:animation-android")
@@ -90,18 +97,18 @@ dependencies {
     implementation("androidx.compose.ui:ui-graphics")
     implementation("androidx.compose.ui:ui-tooling-preview")
     implementation("androidx.compose.ui:ui-android")
-    implementation("androidx.compose.material3:material3:latest.release")
+    implementation("androidx.compose.material3:material3:1.3.0-alpha06")
     implementation("androidx.compose.material3:material3-window-size-class")
     implementation("androidx.compose.material:material-icons-extended")
     implementation("androidx.compose.material:material")
 
     // All dependencies
-    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.7.0")
+    implementation("androidx.lifecycle:lifecycle-viewmodel-compose:2.8.1")
     implementation("com.google.accompanist:accompanist-swiperefresh:0.24.2-alpha")
 
     // Dagger - Hilt
     implementation("com.google.dagger:hilt-android:2.51.1")
-    debugImplementation("androidx.compose.ui:ui-tooling:1.6.6")
+    debugImplementation("androidx.compose.ui:ui-tooling:1.6.7")
     ksp("com.google.dagger:hilt-android-compiler:2.51")
     implementation("com.google.dagger:hilt-compiler:latest.release")
     ksp("androidx.hilt:hilt-compiler:latest.release")
@@ -152,4 +159,11 @@ dependencies {
     // About open source libraries
     implementation("com.mikepenz:aboutlibraries-core:latest.release")
     implementation("com.mikepenz:aboutlibraries-compose-m3:latest.release")
+
+    // Translator
+    implementation("com.google.mlkit:translate:latest.release")
+    implementation("com.google.mlkit:language-id:latest.release")
+
+    // Navigation
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.6.2")
 }

app/src/main/java/ua/acclorite/book_story/Activity.kt

@@ -25,31 +25,23 @@ import ua.acclorite.book_story.presentation.data.MainViewModel
 import ua.acclorite.book_story.presentation.data.NavigationHost
 import ua.acclorite.book_story.presentation.data.Screen
 import ua.acclorite.book_story.presentation.screens.about.AboutScreenRoot
-import ua.acclorite.book_story.presentation.screens.about.data.AboutViewModel
 import ua.acclorite.book_story.presentation.screens.about.nested.credits.CreditsScreenRoot
 import ua.acclorite.book_story.presentation.screens.about.nested.license_info.LicenseInfoScreenRoot
-import ua.acclorite.book_story.presentation.screens.about.nested.license_info.data.LicenseInfoViewModel
 import ua.acclorite.book_story.presentation.screens.about.nested.licenses.LicensesScreenRoot
-import ua.acclorite.book_story.presentation.screens.about.nested.licenses.data.LicensesViewModel
 import ua.acclorite.book_story.presentation.screens.book_info.BookInfoScreenRoot
-import ua.acclorite.book_story.presentation.screens.book_info.data.BookInfoViewModel
 import ua.acclorite.book_story.presentation.screens.browse.BrowseScreenRoot
 import ua.acclorite.book_story.presentation.screens.browse.data.BrowseViewModel
 import ua.acclorite.book_story.presentation.screens.help.HelpScreenRoot
-import ua.acclorite.book_story.presentation.screens.help.data.HelpViewModel
 import ua.acclorite.book_story.presentation.screens.history.HistoryScreenRoot
 import ua.acclorite.book_story.presentation.screens.history.data.HistoryViewModel
 import ua.acclorite.book_story.presentation.screens.library.LibraryScreenRoot
 import ua.acclorite.book_story.presentation.screens.library.data.LibraryViewModel
 import ua.acclorite.book_story.presentation.screens.reader.ReaderScreenRoot
-import ua.acclorite.book_story.presentation.screens.reader.data.ReaderViewModel
 import ua.acclorite.book_story.presentation.screens.settings.SettingsScreenRoot
-import ua.acclorite.book_story.presentation.screens.settings.data.SettingsViewModel
 import ua.acclorite.book_story.presentation.screens.settings.nested.appearance.AppearanceSettingsRoot
 import ua.acclorite.book_story.presentation.screens.settings.nested.general.GeneralSettingsRoot
 import ua.acclorite.book_story.presentation.screens.settings.nested.reader.ReaderSettingsRoot
 import ua.acclorite.book_story.presentation.screens.start.StartScreenRoot
-import ua.acclorite.book_story.presentation.screens.start.data.StartViewModel
 import ua.acclorite.book_story.presentation.ui.BookStoryTheme
 import ua.acclorite.book_story.presentation.ui.Transitions
 import ua.acclorite.book_story.presentation.ui.isDark
@@ -66,14 +58,6 @@ class Activity : AppCompatActivity() {
     private val libraryViewModel: LibraryViewModel by viewModels()
     private val historyViewModel: HistoryViewModel by viewModels()
     private val browseViewModel: BrowseViewModel by viewModels()
-    private val bookInfoViewModel: BookInfoViewModel by viewModels()
-    private val readerViewModel: ReaderViewModel by viewModels()
-    private val helpViewModel: HelpViewModel by viewModels()
-    private val aboutViewModel: AboutViewModel by viewModels()
-    private val licenseInfoViewModel: LicenseInfoViewModel by viewModels()
-    private val licensesViewModel: LicensesViewModel by viewModels()
-    private val settingsViewModel: SettingsViewModel by viewModels()
-    private val startViewModel: StartViewModel by viewModels()
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
@@ -102,8 +86,8 @@ class Activity : AppCompatActivity() {
         WindowCompat.setDecorFitsSystemWindows(window, false)
 
         setContent {
-            val isLoaded by mainViewModel.isReady.collectAsState()
+            val isLoaded = mainViewModel.isReady.collectAsState()
-            val state by mainViewModel.state.collectAsState()
+            val state = mainViewModel.state.collectAsState()
 
             val density = LocalDensity.current
             val imeInsets = WindowInsets.ime
@@ -120,15 +104,15 @@ class Activity : AppCompatActivity() {
                 }
             }
 
-            if (isLoaded) {
+            if (isLoaded.value) {
                 BookStoryTheme(
-                    theme = state.theme!!,
+                    theme = state.value.theme!!,
-                    isDark = state.darkTheme!!.isDark(),
+                    isDark = state.value.darkTheme!!.isDark(),
-                    isPureDark = state.pureDark!!.isPureDark(this),
+                    isPureDark = state.value.pureDark!!.isPureDark(this),
-                    themeContrast = state.themeContrast!!
+                    themeContrast = state.value.themeContrast!!
                 ) {
                     NavigationHost(
-                        startScreen = if (state.showStartScreen!!) Screen.START
+                        startScreen = if (state.value.showStartScreen!!) Screen.START
                         else Screen.LIBRARY
                     ) {
                         navigation(

app/src/main/java/ua/acclorite/book_story/data/di/AppModule.kt

@@ -2,6 +2,10 @@ package ua.acclorite.book_story.data.di
 
 import android.app.Application
 import androidx.room.Room
+import com.google.mlkit.common.model.RemoteModelManager
+import com.google.mlkit.nl.languageid.LanguageIdentification
+import com.google.mlkit.nl.languageid.LanguageIdentificationOptions
+import com.google.mlkit.nl.languageid.LanguageIdentifier
 import com.squareup.moshi.Moshi
 import com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory
 import dagger.Module
@@ -41,4 +45,20 @@ object AppModule {
             "book_db"
         ).allowMainThreadQueries().build().dao
     }
+
+    @Provides
+    @Singleton
+    fun provideModelManager(): RemoteModelManager {
+        return RemoteModelManager.getInstance()
+    }
+
+    @Provides
+    @Singleton
+    fun provideLanguageIdentifier(): LanguageIdentifier {
+        return LanguageIdentification.getClient(
+            LanguageIdentificationOptions.Builder()
+                .setConfidenceThreshold(0.2f)
+                .build()
+        )
+    }
 }

app/src/main/java/ua/acclorite/book_story/data/local/dto/BookEntity.kt

@@ -1,5 +1,6 @@
 package ua.acclorite.book_story.data.local.dto
 
+import androidx.room.ColumnInfo
 import androidx.room.Entity
 import androidx.room.PrimaryKey
 import ua.acclorite.book_story.domain.model.Category
@@ -16,5 +17,10 @@ data class BookEntity(
     val scrollOffset: Int,
     val progress: Float,
     val image: String? = null,
-    val category: Category
+    val category: Category,
+    @ColumnInfo(defaultValue = "false") val enableTranslator: Boolean,
+    @ColumnInfo(defaultValue = "auto") val translateFrom: String,
+    @ColumnInfo(defaultValue = "en") val translateTo: String,
+    @ColumnInfo(defaultValue = "true") val doubleClickTranslation: Boolean,
+    @ColumnInfo(defaultValue = "false") val translateWhenOpen: Boolean
 )

app/src/main/java/ua/acclorite/book_story/data/local/notification/UpdatesNotificationService.kt

@@ -1,10 +1,10 @@
 package ua.acclorite.book_story.data.local.notification
 
-import ua.acclorite.book_story.data.remote.dto.ReleaseResponse
+import ua.acclorite.book_story.data.remote.dto.LatestReleaseInfo
 
 interface UpdatesNotificationService {
 
-    fun postNotification(releaseInfo: ReleaseResponse)
+    fun postNotification(releaseInfo: LatestReleaseInfo)
 
     companion object {
         const val CHANNEL_ID = "updates_channel"

app/src/main/java/ua/acclorite/book_story/data/local/notification/UpdatesNotificationServiceImpl.kt

@@ -8,7 +8,7 @@ import android.content.Context
 import android.content.Intent
 import android.net.Uri
 import ua.acclorite.book_story.R
-import ua.acclorite.book_story.data.remote.dto.ReleaseResponse
+import ua.acclorite.book_story.data.remote.dto.LatestReleaseInfo
 import javax.inject.Inject
 
 class UpdatesNotificationServiceImpl @Inject constructor(
@@ -18,7 +18,7 @@ class UpdatesNotificationServiceImpl @Inject constructor(
     private val notificationManager = application.getSystemService(Context.NOTIFICATION_SERVICE)
             as NotificationManager
 
-    override fun postNotification(releaseInfo: ReleaseResponse) {
+    override fun postNotification(releaseInfo: LatestReleaseInfo) {
         val downloadLatestVersionIntent = Intent(
             Intent.ACTION_VIEW,
             Uri.parse(application.getString(R.string.download_latest_release_page))

app/src/main/java/ua/acclorite/book_story/data/local/room/BookDatabase.kt

@@ -1,5 +1,6 @@
 package ua.acclorite.book_story.data.local.room
 
+import androidx.room.AutoMigration
 import androidx.room.Database
 import androidx.room.RoomDatabase
 import ua.acclorite.book_story.data.local.dto.BookEntity
@@ -10,8 +11,11 @@ import ua.acclorite.book_story.data.local.dto.HistoryEntity
         BookEntity::class,
         HistoryEntity::class
     ],
-    version = 1,
+    version = 2,
-    exportSchema = false
+    autoMigrations = [
+        AutoMigration(1, 2)
+    ],
+    exportSchema = true
 )
 abstract class BookDatabase : RoomDatabase() {
     abstract val dao: BookDao

app/src/main/java/ua/acclorite/book_story/data/mapper/book/BookMapperImpl.kt

@@ -20,7 +20,12 @@ class BookMapperImpl @Inject constructor() : BookMapper {
             textPath = book.textPath,
             description = book.description,
             image = if (book.coverImage != null) book.coverImage.toString() else null,
-            category = book.category
+            category = book.category,
+            enableTranslator = book.enableTranslator,
+            translateFrom = book.translateFrom,
+            translateTo = book.translateTo,
+            doubleClickTranslation = book.doubleClickTranslation,
+            translateWhenOpen = book.translateWhenOpen
         )
     }
 
@@ -39,7 +44,12 @@ class BookMapperImpl @Inject constructor() : BookMapper {
             filePath = bookEntity.filePath,
             lastOpened = null,
             category = bookEntity.category,
-            coverImage = if (bookEntity.image != null) Uri.parse(bookEntity.image) else null
+            coverImage = if (bookEntity.image != null) Uri.parse(bookEntity.image) else null,
+            enableTranslator = bookEntity.enableTranslator,
+            translateFrom = bookEntity.translateFrom,
+            translateTo = bookEntity.translateTo,
+            doubleClickTranslation = bookEntity.doubleClickTranslation,
+            translateWhenOpen = bookEntity.translateWhenOpen
         )
     }
 }

app/src/main/java/ua/acclorite/book_story/data/parser/TextParser.kt

@@ -1,9 +1,8 @@
 package ua.acclorite.book_story.data.parser
 
-import ua.acclorite.book_story.domain.model.StringWithId
 import ua.acclorite.book_story.domain.util.Resource
 import java.io.File
 
 interface TextParser {
-    suspend fun parse(file: File): Resource<List<StringWithId>>
+    suspend fun parse(file: File): Resource<List<String>>
 }

app/src/main/java/ua/acclorite/book_story/data/parser/TextParserImpl.kt

@@ -4,7 +4,6 @@ import ua.acclorite.book_story.R
 import ua.acclorite.book_story.data.parser.epub.EpubTextParser
 import ua.acclorite.book_story.data.parser.pdf.PdfTextParser
 import ua.acclorite.book_story.data.parser.txt.TxtTextParser
-import ua.acclorite.book_story.domain.model.StringWithId
 import ua.acclorite.book_story.domain.util.Resource
 import ua.acclorite.book_story.domain.util.UIText
 import java.io.File
@@ -15,7 +14,7 @@ class TextParserImpl @Inject constructor(
     private val pdfTextParser: PdfTextParser,
     private val epubTextParser: EpubTextParser,
 ) : TextParser {
-    override suspend fun parse(file: File): Resource<List<StringWithId>> {
+    override suspend fun parse(file: File): Resource<List<String>> {
         val fileFormat = ".${file.name.substringAfterLast(".")}"
 
         if (fileFormat == ".pdf") {

app/src/main/java/ua/acclorite/book_story/data/parser/epub/EpubFileParser.kt

@@ -55,7 +55,12 @@ class EpubFileParser @Inject constructor() : FileParser {
                 filePath = file.path,
                 lastOpened = null,
                 category = Category.entries[0],
-                coverImage = null
+                coverImage = null,
+                enableTranslator = false,
+                translateFrom = "",
+                translateTo = "",
+                doubleClickTranslation = false,
+                translateWhenOpen = false
             ) to coverImage
         } catch (e: Exception) {
             return null

app/src/main/java/ua/acclorite/book_story/data/parser/epub/EpubTextParser.kt

@@ -8,7 +8,6 @@ import org.jsoup.nodes.Document.OutputSettings
 import org.jsoup.safety.Safelist
 import ua.acclorite.book_story.R
 import ua.acclorite.book_story.data.parser.TextParser
-import ua.acclorite.book_story.domain.model.StringWithId
 import ua.acclorite.book_story.domain.util.Resource
 import ua.acclorite.book_story.domain.util.UIText
 import java.io.BufferedReader
@@ -21,7 +20,7 @@ import javax.inject.Inject
 
 class EpubTextParser @Inject constructor() : TextParser {
 
-    override suspend fun parse(file: File): Resource<List<StringWithId>> {
+    override suspend fun parse(file: File): Resource<List<String>> {
         if (!file.name.endsWith(".epub")) {
             return Resource.Error(UIText.StringResource(R.string.error_wrong_file_format))
         }
@@ -57,7 +56,7 @@ class EpubTextParser @Inject constructor() : TextParser {
                 }
             }
 
-            val stringWithIds = mutableListOf<StringWithId>()
+            val strings = mutableListOf<String>()
 
             val parsedText = Jsoup.parse(unformattedText.toString())
             parsedText.outputSettings(OutputSettings().prettyPrint(false))
@@ -78,15 +77,15 @@ class EpubTextParser @Inject constructor() : TextParser {
                 .split("\n")
                 .forEach {
                     if (it.isNotBlank()) {
-                        stringWithIds.add(StringWithId(it.trim()))
+                        strings.add(it.trim())
                     }
                 }
 
-            if (stringWithIds.isEmpty()) {
+            if (strings.isEmpty()) {
                 return Resource.Error(UIText.StringResource(R.string.error_file_empty))
             }
 
-            return Resource.Success(stringWithIds)
+            return Resource.Success(strings)
         } catch (e: Exception) {
             return Resource.Error(
                 UIText.StringResource(

app/src/main/java/ua/acclorite/book_story/data/parser/pdf/PdfFileParser.kt

@@ -43,7 +43,12 @@ class PdfFileParser @Inject constructor(private val application: Application) :
                 filePath = file.path,
                 lastOpened = null,
                 category = Category.entries[0],
-                coverImage = null
+                coverImage = null,
+                enableTranslator = false,
+                translateFrom = "",
+                translateTo = "",
+                doubleClickTranslation = false,
+                translateWhenOpen = false
             ) to null
         } catch (e: Exception) {
             return null

app/src/main/java/ua/acclorite/book_story/data/parser/pdf/PdfTextParser.kt

@@ -6,7 +6,6 @@ import com.tom_roush.pdfbox.pdmodel.PDDocument
 import com.tom_roush.pdfbox.text.PDFTextStripper
 import ua.acclorite.book_story.R
 import ua.acclorite.book_story.data.parser.TextParser
-import ua.acclorite.book_story.domain.model.StringWithId
 import ua.acclorite.book_story.domain.util.Resource
 import ua.acclorite.book_story.domain.util.UIText
 import java.io.File
@@ -14,7 +13,7 @@ import javax.inject.Inject
 
 class PdfTextParser @Inject constructor(private val application: Application) : TextParser {
 
-    override suspend fun parse(file: File): Resource<List<StringWithId>> {
+    override suspend fun parse(file: File): Resource<List<String>> {
         if (!file.name.endsWith(".pdf")) {
             return Resource.Error(UIText.StringResource(R.string.error_wrong_file_format))
         }
@@ -23,7 +22,7 @@ class PdfTextParser @Inject constructor(private val application: Application) :
             PDFBoxResourceLoader.init(application)
 
             val document = PDDocument.load(file)
-            val stringWithIds = mutableListOf<StringWithId>()
+            val strings = mutableListOf<String>()
 
             val pdfStripper = PDFTextStripper()
             pdfStripper.paragraphStart = "</br>"
@@ -103,14 +102,14 @@ class PdfTextParser @Inject constructor(private val application: Application) :
             }
 
             lines.forEach { line ->
-                stringWithIds.add(StringWithId(line.trim()))
+                strings.add(line.trim())
             }
 
-            if (stringWithIds.isEmpty()) {
+            if (strings.isEmpty()) {
                 return Resource.Error(UIText.StringResource(R.string.error_file_empty))
             }
 
-            return Resource.Success(stringWithIds)
+            return Resource.Success(strings)
         } catch (e: Exception) {
             e.printStackTrace()
             return Resource.Error(

app/src/main/java/ua/acclorite/book_story/data/parser/txt/TxtFileParser.kt

@@ -31,7 +31,12 @@ class TxtFileParser @Inject constructor() : FileParser {
                 filePath = file.path,
                 lastOpened = null,
                 category = Category.entries[0],
-                coverImage = null
+                coverImage = null,
+                enableTranslator = false,
+                translateFrom = "",
+                translateTo = "",
+                doubleClickTranslation = false,
+                translateWhenOpen = false
             ) to null
         } catch (e: Exception) {
             return null

app/src/main/java/ua/acclorite/book_story/data/parser/txt/TxtTextParser.kt

@@ -4,7 +4,6 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
 import ua.acclorite.book_story.R
 import ua.acclorite.book_story.data.parser.TextParser
-import ua.acclorite.book_story.domain.model.StringWithId
 import ua.acclorite.book_story.domain.util.Resource
 import ua.acclorite.book_story.domain.util.UIText
 import java.io.BufferedReader
@@ -14,19 +13,19 @@ import javax.inject.Inject
 
 class TxtTextParser @Inject constructor() : TextParser {
 
-    override suspend fun parse(file: File): Resource<List<StringWithId>> {
+    override suspend fun parse(file: File): Resource<List<String>> {
         if (!file.name.endsWith(".txt")) {
             return Resource.Error(UIText.StringResource(R.string.error_wrong_file_format))
         }
 
         return try {
-            val formattedLines = mutableListOf<StringWithId>()
+            val formattedLines = mutableListOf<String>()
 
             withContext(Dispatchers.IO) {
                 BufferedReader(FileReader(file)).forEachLine { line ->
                     if (line.isNotBlank()) {
                         formattedLines.add(
-                            StringWithId(line)
+                            line.trim()
                         )
                     }
                 }

app/src/main/java/ua/acclorite/book_story/data/remote/GithubAPI.kt

@@ -1,11 +1,11 @@
 package ua.acclorite.book_story.data.remote
 
 import retrofit2.http.GET
-import ua.acclorite.book_story.data.remote.dto.ReleaseResponse
+import ua.acclorite.book_story.data.remote.dto.LatestReleaseInfo
 
 interface GithubAPI {
     @GET("repos/Acclorite/book-story/releases/latest")
-    suspend fun getLatestRelease(): ReleaseResponse
+    suspend fun getLatestRelease(): LatestReleaseInfo
 
     companion object {
         const val BASE_URL = "https://api.github.com/"

app/src/main/java/ua/acclorite/book_story/data/remote/dto/LatestReleaseInfo.kt

@@ -8,7 +8,7 @@ import com.squareup.moshi.JsonClass
 @Keep
 @JsonClass(generateAdapter = true)
 @Immutable
-data class ReleaseResponse(
+data class LatestReleaseInfo(
     @Json(name = "name") val name: String,
     @Json(name = "tag_name") val tagName: String
 )

app/src/main/java/ua/acclorite/book_story/data/repository/BookRepositoryImpl.kt

@@ -6,6 +6,13 @@ import android.net.Uri
 import android.os.Environment
 import android.util.Log
 import androidx.datastore.preferences.core.Preferences
+import com.google.mlkit.common.model.DownloadConditions
+import com.google.mlkit.common.model.RemoteModelManager
+import com.google.mlkit.nl.languageid.LanguageIdentifier
+import com.google.mlkit.nl.translate.TranslateLanguage
+import com.google.mlkit.nl.translate.TranslateRemoteModel
+import com.google.mlkit.nl.translate.Translation
+import com.google.mlkit.nl.translate.TranslatorOptions
 import kotlinx.coroutines.CompletableDeferred
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -24,28 +31,35 @@ import ua.acclorite.book_story.data.mapper.history.HistoryMapper
 import ua.acclorite.book_story.data.parser.FileParser
 import ua.acclorite.book_story.data.parser.TextParser
 import ua.acclorite.book_story.data.remote.GithubAPI
-import ua.acclorite.book_story.data.remote.dto.ReleaseResponse
+import ua.acclorite.book_story.data.remote.dto.LatestReleaseInfo
 import ua.acclorite.book_story.domain.model.Book
 import ua.acclorite.book_story.domain.model.History
 import ua.acclorite.book_story.domain.model.NullableBook
-import ua.acclorite.book_story.domain.model.StringWithId
 import ua.acclorite.book_story.domain.repository.BookRepository
 import ua.acclorite.book_story.domain.util.Constants
 import ua.acclorite.book_story.domain.util.CoverImage
+import ua.acclorite.book_story.domain.util.DataStoreConstants
+import ua.acclorite.book_story.domain.util.LanguageCode
 import ua.acclorite.book_story.domain.util.Resource
 import ua.acclorite.book_story.domain.util.UIText
 import ua.acclorite.book_story.presentation.data.MainState
 import java.io.File
 import java.io.FileOutputStream
+import java.util.Locale
 import java.util.UUID
 import javax.inject.Inject
 import javax.inject.Singleton
+import kotlin.coroutines.resume
+import kotlin.coroutines.suspendCoroutine
 
+@Suppress("DEPRECATION")
 @Singleton
 class BookRepositoryImpl @Inject constructor(
     private val application: Application,
     private val database: BookDao,
     private val dataStore: DataStore,
+    private val modelManager: RemoteModelManager,
+    private val languageIdentifier: LanguageIdentifier,
 
     private val githubAPI: GithubAPI,
     private val updatesNotificationService: UpdatesNotificationService,
@@ -88,7 +102,7 @@ class BookRepositoryImpl @Inject constructor(
         }
     }
 
-    override suspend fun getBookText(textPath: String): List<StringWithId> {
+    override suspend fun getBookText(textPath: String): List<String> {
         val textFile = File(textPath)
 
         if (textPath.isBlank() || !textFile.exists()) {
@@ -108,7 +122,7 @@ class BookRepositoryImpl @Inject constructor(
     override suspend fun insertBook(
         book: Book,
         coverImage: CoverImage?,
-        text: List<StringWithId>
+        text: List<String>
     ): Boolean {
         val filesDir = application.filesDir
         val coversDir = File(filesDir, "covers")
@@ -135,7 +149,7 @@ class BookRepositoryImpl @Inject constructor(
             withContext(Dispatchers.IO) {
                 FileOutputStream(textPath).use { stream ->
                     text.forEach { line ->
-                        stream.write(line.line.toByteArray())
+                        stream.write(line.toByteArray())
                         stream.write(System.lineSeparator().toByteArray())
                     }
                 }
@@ -169,12 +183,34 @@ class BookRepositoryImpl @Inject constructor(
             }
         }
 
+        val enableTranslator = dataStore.getNullableData(DataStoreConstants.ENABLE_TRANSLATOR)
+            ?: false
+
+        val translateFrom = dataStore.getNullableData(DataStoreConstants.TRANSLATE_FROM)
+            ?: "auto"
+
+        val translateTo = dataStore.getNullableData(DataStoreConstants.TRANSLATE_TO) ?: if (
+            Constants.LANGUAGES.any { Locale.getDefault().language.take(2) == it.first }
+        ) {
+            Locale.getDefault().language.take(2)
+        } else {
+            "en"
+        }
+
+        val doubleClickTranslation = dataStore.getNullableData(
+            DataStoreConstants.DOUBLE_CLICK_TRANSLATION
+        ) ?: true
+
 
         val updatedBook = book.copy(
             textPath = "$booksDir/$textUri",
             coverImage = if (coverUri.isNotBlank()) {
                 Uri.fromFile(File("$coversDir/$coverUri"))
-            } else null
+            } else null,
+            enableTranslator = enableTranslator,
+            translateFrom = translateFrom,
+            translateTo = translateTo,
+            doubleClickTranslation = doubleClickTranslation
         )
 
         val bookToInsert = bookMapper.toBookEntity(updatedBook)
@@ -197,7 +233,7 @@ class BookRepositoryImpl @Inject constructor(
         )
     }
 
-    override suspend fun updateBookWithText(book: Book, text: List<StringWithId>): Boolean {
+    override suspend fun updateBookWithText(book: Book, text: List<String>): Boolean {
         // without cover image
         val filesDir = application.filesDir
         val booksDir = File(filesDir, "books")
@@ -220,7 +256,7 @@ class BookRepositoryImpl @Inject constructor(
             withContext(Dispatchers.IO) {
                 FileOutputStream(textPath).use { stream ->
                     text.forEach { line ->
-                        stream.write(line.line.toByteArray())
+                        stream.write(line.toByteArray())
                         stream.write(System.lineSeparator().toByteArray())
                     }
                 }
@@ -604,7 +640,7 @@ class BookRepositoryImpl @Inject constructor(
         database.deleteHistory(history.map { historyMapper.toHistoryEntity(it) })
     }
 
-    override suspend fun checkForUpdates(postNotification: Boolean): ReleaseResponse? {
+    override suspend fun checkForUpdates(postNotification: Boolean): LatestReleaseInfo? {
         return withContext(Dispatchers.IO) {
             try {
                 val result = githubAPI.getLatestRelease()
@@ -625,6 +661,155 @@ class BookRepositoryImpl @Inject constructor(
             }
         }
     }
+
+    override suspend fun isLanguageModelDownloaded(languageCode: String): Boolean {
+        val model = TranslateRemoteModel.Builder(languageCode).build()
+        return suspendCoroutine { continuation ->
+            modelManager.isModelDownloaded(model)
+                .addOnSuccessListener {
+                    continuation.resume(it)
+                }
+                .addOnFailureListener {
+                    continuation.resume(false)
+                }
+        }
+    }
+
+    override suspend fun downloadLanguageModel(
+        languageCode: String,
+        onCompleted: () -> Unit,
+        onFailure: (Exception) -> Unit
+    ) {
+        val isLanguageDownloaded = isLanguageModelDownloaded(languageCode)
+        if (isLanguageDownloaded) {
+            onCompleted()
+            return
+        }
+
+        return suspendCoroutine { continuation ->
+            val language = TranslateRemoteModel.Builder(languageCode).build()
+            val conditions = DownloadConditions.Builder().build()
+
+            modelManager.download(language, conditions)
+                .addOnSuccessListener {
+                    onCompleted()
+                    continuation.resume(Unit)
+                }
+                .addOnFailureListener {
+                    onFailure(it)
+                    onCompleted()
+                    continuation.resume(Unit)
+                }
+                .addOnCanceledListener {
+                    onCompleted()
+                    Log.i("TRANSLATOR", "Downloading Model: Canceled")
+                    continuation.resume(Unit)
+                }
+        }
+    }
+
+    override suspend fun deleteLanguageModel(languageCode: String): Boolean {
+        val isLanguageDownloaded = isLanguageModelDownloaded(languageCode)
+        if (!isLanguageDownloaded) {
+            return true
+        }
+
+        return suspendCoroutine { continuation ->
+            val language = TranslateRemoteModel.Builder(languageCode).build()
+
+            modelManager.deleteDownloadedModel(language)
+                .addOnSuccessListener {
+                    continuation.resume(true)
+                }
+                .addOnFailureListener {
+                    continuation.resume(false)
+                }
+        }
+    }
+
+    override suspend fun identifyLanguage(text: String): Resource<String> {
+        return suspendCoroutine { continuation ->
+            languageIdentifier.identifyLanguage(text)
+                .addOnSuccessListener {
+                    val languageCode = it.trim().lowercase().take(2)
+                    var identified = true
+
+                    if (languageCode == "ru") {
+                        identified = false
+                    }
+
+                    if (TranslateLanguage.fromLanguageTag(languageCode) == null) {
+                        identified = false
+                    }
+
+                    if (identified) {
+                        continuation.resume(
+                            Resource.Success(languageCode)
+                        )
+                        return@addOnSuccessListener
+                    }
+
+                    continuation.resume(
+                        Resource.Error(UIText.StringResource(R.string.error_language_not_identified))
+                    )
+                }
+                .addOnFailureListener {
+                    continuation.resume(
+                        Resource.Error(
+                            UIText.StringResource(
+                                R.string.error_query,
+                                it.message ?: ""
+                            )
+                        )
+                    )
+                }
+        }
+    }
+
+    override suspend fun translateText(
+        sourceLanguage: LanguageCode,
+        targetLanguage: LanguageCode,
+        text: String
+    ): Resource<String> {
+        return suspendCoroutine { continuation ->
+            val translatorOptions = TranslatorOptions.Builder()
+                .setSourceLanguage(sourceLanguage)
+                .setTargetLanguage(targetLanguage)
+                .build()
+            val translator = Translation.getClient(translatorOptions)
+
+            translator.translate(text)
+                .addOnSuccessListener {
+                    translator.close()
+                    continuation.resume(
+                        Resource.Success(
+                            it.trim()
+                        )
+                    )
+                }
+                .addOnFailureListener {
+                    translator.close()
+                    continuation.resume(
+                        Resource.Error(
+                            UIText.StringResource(
+                                R.string.error_query,
+                                it.message ?: ""
+                            )
+                        )
+                    )
+                }
+                .addOnCanceledListener {
+                    translator.close()
+                    continuation.resume(
+                        Resource.Error(
+                            UIText.StringResource(
+                                R.string.error_something_went_wrong
+                            )
+                        )
+                    )
+                }
+        }
+    }
 }
 
 

app/src/main/java/ua/acclorite/book_story/domain/model/Book.kt

@@ -22,4 +22,10 @@ data class Book(
 
     val lastOpened: Long?,
     val category: Category,
+
+    val enableTranslator: Boolean,
+    val translateFrom: String,
+    val translateTo: String,
+    val doubleClickTranslation: Boolean,
+    val translateWhenOpen: Boolean
 )

app/src/main/java/ua/acclorite/book_story/domain/model/Language.kt

@@ -0,0 +1,31 @@
+package ua.acclorite.book_story.domain.model
+
+import androidx.compose.runtime.Immutable
+import ua.acclorite.book_story.domain.util.ID
+import ua.acclorite.book_story.domain.util.Selected
+import ua.acclorite.book_story.domain.util.UIText
+
+@Immutable
+data class Language(
+    val languageCode: String,
+    val displayLanguage: String,
+    val isDownloading: Boolean,
+    val isCanceled: Boolean,
+    val isDownloaded: Boolean,
+    val isSelected: Selected,
+    val historyOrder: Int?
+)
+
+@Immutable
+data class SelectableLanguage(
+    val languageCode: String,
+    val displayLanguage: String,
+    val isDownloading: Boolean,
+    val isCanceled: Boolean,
+    val isDownloaded: Boolean,
+    val isError: Boolean,
+    val errorMessage: UIText? = null,
+    val isSelected: Selected,
+    val canUnselect: Boolean,
+    val occurrences: List<ID>?
+)

app/src/main/java/ua/acclorite/book_story/domain/model/LanguageHistory.kt

@@ -3,11 +3,10 @@ package ua.acclorite.book_story.domain.model
 import android.os.Parcelable
 import androidx.compose.runtime.Immutable
 import kotlinx.parcelize.Parcelize
-import java.util.UUID
 
 @Parcelize
 @Immutable
-data class StringWithId(
+data class LanguageHistory(
-    val line: String,
+    val id: Int,
-    val id: String = UUID.randomUUID().toString()
+    val languageCode: String
 ) : Parcelable

app/src/main/java/ua/acclorite/book_story/domain/model/LineWithTranslation.kt

@@ -0,0 +1,21 @@
+package ua.acclorite.book_story.domain.model
+
+import android.os.Parcelable
+import androidx.compose.runtime.Immutable
+import kotlinx.parcelize.Parcelize
+import ua.acclorite.book_story.domain.util.UIText
+
+@Parcelize
+@Immutable
+data class LineWithTranslation(
+    val originalLine: String,
+
+    val useTranslation: Boolean = false,
+    val translatingFrom: String = "",
+    val translatingTo: String = "",
+    val translatedLine: String? = null,
+
+    val isTranslationLoading: Boolean = false,
+    val isTranslationFailed: Boolean = false,
+    val errorMessage: UIText? = null
+) : Parcelable

app/src/main/java/ua/acclorite/book_story/domain/model/NavigationItem.kt

@@ -1,11 +1,15 @@
 package ua.acclorite.book_story.domain.model
 
+import androidx.annotation.DrawableRes
+import androidx.annotation.StringRes
 import androidx.compose.runtime.Immutable
-import androidx.compose.ui.graphics.painter.Painter
+import ua.acclorite.book_story.presentation.data.Screen
 
 @Immutable
 data class NavigationItem(
-    val title: String,
+    val screen: Screen,
-    val selectedIcon: Painter,
+    @StringRes val title: Int,
-    val unselectedIcon: Painter
+    @StringRes val tooltip: Int,
+    @DrawableRes val selectedIcon: Int,
+    @DrawableRes val unselectedIcon: Int
 )

app/src/main/java/ua/acclorite/book_story/domain/model/NullableBook.kt

@@ -8,14 +8,14 @@ import ua.acclorite.book_story.domain.util.UIText
 sealed class NullableBook(
     val book: Book?,
     val coverImage: CoverImage? = null,
-    val text: List<StringWithId> = emptyList(),
+    val text: List<String> = emptyList(),
     val fileName: String?,
     val message: UIText?
 ) {
     class NotNull(
         book: Book,
         coverImage: CoverImage?,
-        text: List<StringWithId>
+        text: List<String>
     ) : NullableBook(
         book = book,
         text = text,

app/src/main/java/ua/acclorite/book_story/domain/repository/BookRepository.kt

@@ -3,12 +3,12 @@ package ua.acclorite.book_story.domain.repository
 import androidx.datastore.preferences.core.Preferences
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.flow.Flow
-import ua.acclorite.book_story.data.remote.dto.ReleaseResponse
+import ua.acclorite.book_story.data.remote.dto.LatestReleaseInfo
 import ua.acclorite.book_story.domain.model.Book
 import ua.acclorite.book_story.domain.model.History
 import ua.acclorite.book_story.domain.model.NullableBook
-import ua.acclorite.book_story.domain.model.StringWithId
 import ua.acclorite.book_story.domain.util.CoverImage
+import ua.acclorite.book_story.domain.util.LanguageCode
 import ua.acclorite.book_story.domain.util.Resource
 import ua.acclorite.book_story.presentation.data.MainState
 import java.io.File
@@ -25,12 +25,12 @@ interface BookRepository {
 
     suspend fun getBookText(
         textPath: String
-    ): List<StringWithId>
+    ): List<String>
 
     suspend fun insertBook(
         book: Book,
         coverImage: CoverImage?,
-        text: List<StringWithId>
+        text: List<String>
     ): Boolean
 
     suspend fun updateBooks(
@@ -39,7 +39,7 @@ interface BookRepository {
 
     suspend fun updateBookWithText(
         book: Book,
-        text: List<StringWithId>
+        text: List<String>
     ): Boolean
 
     suspend fun updateCoverImageOfBook(
@@ -51,6 +51,7 @@ interface BookRepository {
         books: List<Book>
     )
 
+
     suspend fun <T> retrieveDataFromDataStore(
         key: Preferences.Key<T>,
         defaultValue: T
@@ -61,12 +62,14 @@ interface BookRepository {
         value: T
     )
 
+
     suspend fun getAllSettings(scope: CoroutineScope): MainState
 
     suspend fun getFilesFromDevice(query: String = ""): Flow<Resource<List<File>>>
 
     suspend fun getBooksFromFiles(files: List<File>): List<NullableBook>
 
+
     suspend fun insertHistory(history: List<History>)
 
     suspend fun getHistory(): Flow<Resource<List<History>>>
@@ -81,5 +84,25 @@ interface BookRepository {
         history: List<History>
     )
 
-    suspend fun checkForUpdates(postNotification: Boolean): ReleaseResponse?
+
+    suspend fun checkForUpdates(postNotification: Boolean): LatestReleaseInfo?
+
+
+    suspend fun isLanguageModelDownloaded(languageCode: String): Boolean
+
+    suspend fun downloadLanguageModel(
+        languageCode: String,
+        onCompleted: () -> Unit,
+        onFailure: (Exception) -> Unit
+    )
+
+    suspend fun deleteLanguageModel(languageCode: String): Boolean
+
+    suspend fun identifyLanguage(text: String): Resource<String>
+
+    suspend fun translateText(
+        sourceLanguage: LanguageCode,
+        targetLanguage: LanguageCode,
+        text: String
+    ): Resource<String>
 }

app/src/main/java/ua/acclorite/book_story/domain/use_case/CheckForUpdates.kt

@@ -1,12 +1,12 @@
 package ua.acclorite.book_story.domain.use_case
 
-import ua.acclorite.book_story.data.remote.dto.ReleaseResponse
+import ua.acclorite.book_story.data.remote.dto.LatestReleaseInfo
 import ua.acclorite.book_story.domain.repository.BookRepository
 import javax.inject.Inject
 
 class CheckForUpdates @Inject constructor(private val repository: BookRepository) {
 
-    suspend fun execute(postNotification: Boolean): ReleaseResponse? {
+    suspend fun execute(postNotification: Boolean): LatestReleaseInfo? {
         return repository.checkForUpdates(postNotification)
     }
 }

app/src/main/java/ua/acclorite/book_story/domain/use_case/DeleteLanguageModel.kt

@@ -0,0 +1,15 @@
+package ua.acclorite.book_story.domain.use_case
+
+import ua.acclorite.book_story.domain.repository.BookRepository
+import javax.inject.Inject
+
+class DeleteLanguageModel @Inject constructor(
+    private val repository: BookRepository
+) {
+
+    suspend fun execute(languageCode: String): Boolean {
+        return repository.deleteLanguageModel(
+            languageCode = languageCode
+        )
+    }
+}

app/src/main/java/ua/acclorite/book_story/domain/use_case/DownloadLanguageModel.kt

@@ -0,0 +1,21 @@
+package ua.acclorite.book_story.domain.use_case
+
+import ua.acclorite.book_story.domain.repository.BookRepository
+import javax.inject.Inject
+
+class DownloadLanguageModel @Inject constructor(
+    private val repository: BookRepository
+) {
+
+    suspend fun execute(
+        languageCode: String,
+        onCompleted: () -> Unit,
+        onFailure: (Exception) -> Unit
+    ) {
+        repository.downloadLanguageModel(
+            languageCode = languageCode,
+            onCompleted = onCompleted,
+            onFailure = onFailure
+        )
+    }
+}

app/src/main/java/ua/acclorite/book_story/domain/use_case/GetText.kt

@@ -1,12 +1,15 @@
 package ua.acclorite.book_story.domain.use_case
 
-import ua.acclorite.book_story.domain.model.StringWithId
+import ua.acclorite.book_story.domain.model.LineWithTranslation
 import ua.acclorite.book_story.domain.repository.BookRepository
+import ua.acclorite.book_story.domain.util.ID
 import javax.inject.Inject
 
 class GetText @Inject constructor(private val repository: BookRepository) {
 
-    suspend fun execute(textPath: String): List<StringWithId> {
+    suspend fun execute(textPath: String): Map<ID, LineWithTranslation> {
-        return repository.getBookText(textPath = textPath)
+        return repository.getBookText(textPath = textPath).withIndex().associate {
+            it.index to LineWithTranslation(originalLine = it.value)
+        }
     }
 }

app/src/main/java/ua/acclorite/book_story/domain/use_case/IdentifyLanguage.kt

@@ -0,0 +1,15 @@
+package ua.acclorite.book_story.domain.use_case
+
+import ua.acclorite.book_story.domain.repository.BookRepository
+import ua.acclorite.book_story.domain.util.LanguageCode
+import ua.acclorite.book_story.domain.util.Resource
+import javax.inject.Inject
+
+class IdentifyLanguage @Inject constructor(
+    private val repository: BookRepository
+) {
+
+    suspend fun execute(text: String): Resource<LanguageCode> {
+        return repository.identifyLanguage(text)
+    }
+}

app/src/main/java/ua/acclorite/book_story/domain/use_case/InsertBook.kt

@@ -1,13 +1,16 @@
 package ua.acclorite.book_story.domain.use_case
 
 import ua.acclorite.book_story.domain.model.Book
-import ua.acclorite.book_story.domain.model.StringWithId
 import ua.acclorite.book_story.domain.repository.BookRepository
 import ua.acclorite.book_story.domain.util.CoverImage
 import javax.inject.Inject
 
 class InsertBook @Inject constructor(private val repository: BookRepository) {
-    suspend fun execute(book: Book, coverImage: CoverImage?, text: List<StringWithId>): Boolean {
+    suspend fun execute(
+        book: Book,
+        coverImage: CoverImage?,
+        text: List<String>
+    ): Boolean {
         return repository.insertBook(book, coverImage, text)
     }
 }

app/src/main/java/ua/acclorite/book_story/domain/use_case/IsLanguageModelDownloaded.kt

@@ -0,0 +1,13 @@
+package ua.acclorite.book_story.domain.use_case
+
+import ua.acclorite.book_story.domain.repository.BookRepository
+import javax.inject.Inject
+
+class IsLanguageModelDownloaded @Inject constructor(
+    private val repository: BookRepository
+) {
+
+    suspend fun execute(languageCode: String): Boolean {
+        return repository.isLanguageModelDownloaded(languageCode)
+    }
+}

app/src/main/java/ua/acclorite/book_story/domain/use_case/TranslateText.kt

@@ -0,0 +1,23 @@
+package ua.acclorite.book_story.domain.use_case
+
+import ua.acclorite.book_story.domain.repository.BookRepository
+import ua.acclorite.book_story.domain.util.LanguageCode
+import ua.acclorite.book_story.domain.util.Resource
+import javax.inject.Inject
+
+class TranslateText @Inject constructor(
+    private val repository: BookRepository
+) {
+
+    suspend fun execute(
+        sourceLanguage: LanguageCode,
+        targetLanguage: LanguageCode,
+        text: String
+    ): Resource<String> {
+        return repository.translateText(
+            sourceLanguage,
+            targetLanguage,
+            text
+        )
+    }
+}

app/src/main/java/ua/acclorite/book_story/domain/use_case/UpdateBookWithText.kt

@@ -1,13 +1,12 @@
 package ua.acclorite.book_story.domain.use_case
 
 import ua.acclorite.book_story.domain.model.Book
-import ua.acclorite.book_story.domain.model.StringWithId
 import ua.acclorite.book_story.domain.repository.BookRepository
 import javax.inject.Inject
 
 class UpdateBookWithText @Inject constructor(private val repository: BookRepository) {
 
-    suspend fun execute(book: Book, text: List<StringWithId>): Boolean {
+    suspend fun execute(book: Book, text: List<String>): Boolean {
         return repository.updateBookWithText(book, text)
     }
 }

app/src/main/java/ua/acclorite/book_story/domain/util/Constants.kt

@@ -9,6 +9,8 @@ import ua.acclorite.book_story.domain.model.Book
 import ua.acclorite.book_story.domain.model.Category
 import ua.acclorite.book_story.domain.model.Credit
 import ua.acclorite.book_story.domain.model.FontWithName
+import ua.acclorite.book_story.domain.model.NavigationItem
+import ua.acclorite.book_story.presentation.data.Screen
 import ua.acclorite.book_story.presentation.ui.Theme
 
 object Constants {
@@ -25,6 +27,31 @@ object Constants {
         Pair("uk", "Українська"),
     )
 
+    // Navigation items for NavigationBars.
+    val NAVIGATION_ITEMS = listOf(
+        NavigationItem(
+            screen = Screen.LIBRARY,
+            title = R.string.library_screen,
+            tooltip = R.string.library_content_desc,
+            selectedIcon = R.drawable.library_screen_filled,
+            unselectedIcon = R.drawable.library_screen_outlined
+        ),
+        NavigationItem(
+            screen = Screen.HISTORY,
+            title = R.string.history_screen,
+            tooltip = R.string.history_content_desc,
+            selectedIcon = R.drawable.history_screen_filled,
+            unselectedIcon = R.drawable.history_screen_outlined
+        ),
+        NavigationItem(
+            screen = Screen.BROWSE,
+            title = R.string.browse_screen,
+            tooltip = R.string.browse_content_desc,
+            selectedIcon = R.drawable.browse_screen_filled,
+            unselectedIcon = R.drawable.browse_screen_outlined
+        )
+    )
+
     // Supported themes
     val THEMES = listOf(
         Pair(Theme.DYNAMIC, UIText.StringResource(R.string.dynamic_theme)),
@@ -255,6 +282,11 @@ object Constants {
         scrollOffset = 0,
         progress = 0f,
         lastOpened = null,
-        category = Category.READING
+        category = Category.READING,
+        enableTranslator = false,
+        translateFrom = "",
+        translateTo = "",
+        doubleClickTranslation = false,
+        translateWhenOpen = false
     )
 }

app/src/main/java/ua/acclorite/book_story/domain/util/DataStoreConstants.kt

@@ -6,6 +6,7 @@ import androidx.datastore.preferences.core.longPreferencesKey
 import androidx.datastore.preferences.core.stringPreferencesKey
 
 object DataStoreConstants {
+    // App settings
     val LANGUAGE = stringPreferencesKey("language")
     val THEME = stringPreferencesKey("theme")
     val DARK_THEME = stringPreferencesKey("dark_theme")
@@ -22,4 +23,9 @@ object DataStoreConstants {
     val PARAGRAPH_INDENTATION = booleanPreferencesKey("paragraph_indentation")
     val CHECK_FOR_UPDATES = booleanPreferencesKey("check_for_updates")
     val SIDE_PADDING = intPreferencesKey("side_padding")
+    val ENABLE_TRANSLATOR = booleanPreferencesKey("enable_translator")
+    val TRANSLATE_FROM = stringPreferencesKey("translate_from")
+    val TRANSLATE_TO = stringPreferencesKey("translate_to")
+    val DOUBLE_CLICK_TRANSLATION = booleanPreferencesKey("double_click_translation")
+    val TRANSLATOR_LANGUAGE_HISTORY = stringPreferencesKey("translator_languages_history")
 }

app/src/main/java/ua/acclorite/book_story/domain/util/Typealias.kt

@@ -4,3 +4,6 @@ import android.graphics.Bitmap
 
 typealias CoverImage = Bitmap
 typealias Selected = Boolean
+typealias ID = Int
+typealias LanguageCode = String
+typealias Route = String

app/src/main/java/ua/acclorite/book_story/domain/util/UIText.kt

@@ -1,14 +1,19 @@
 package ua.acclorite.book_story.domain.util
 
 import android.content.Context
+import android.os.Parcelable
 import androidx.annotation.StringRes
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.Immutable
 import androidx.compose.ui.res.stringResource
+import kotlinx.parcelize.Parcelize
+import java.io.Serializable
 
-
+@Parcelize
-sealed class UIText(val string: String?) {
+@Immutable
+sealed class UIText(val string: String?) : Parcelable {
     data class StringValue(val value: String) : UIText(value)
-    class StringResource(@StringRes val resId: Int, vararg val args: Any) : UIText(null)
+    class StringResource(@StringRes val resId: Int, vararg val args: Serializable) : UIText(null)
 
     @Composable
     fun asString(): String {

app/src/main/java/ua/acclorite/book_story/presentation/components/CustomBottomSheet.kt

@@ -0,0 +1,71 @@
+package ua.acclorite.book_story.presentation.components
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.foundation.layout.WindowInsets
+import androidx.compose.foundation.layout.asPaddingValues
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.navigationBars
+import androidx.compose.material3.BottomSheetDefaults
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.ModalBottomSheet
+import androidx.compose.material3.rememberModalBottomSheetState
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.Shape
+import androidx.compose.ui.unit.Dp
+
+/**
+ * Custom Bottom Sheet. Fixes bugs with [ModalBottomSheet].
+ *
+ * @param modifier [Modifier].
+ * @param hasFixedHeight Whether the bottom sheet has fixed height passed through [modifier] or not.
+ * @param scrimColor Scrim color.
+ * @param shape Shape.
+ * @param containerColor Container color.
+ * @param onDismissRequest OnDismiss callback.
+ * @param dragHandle Drag Handle, pass null to disable.
+ * @param content Content inside [ModalBottomSheet]. Provides you navigation bar padding.
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun CustomBottomSheet(
+    modifier: Modifier = Modifier,
+    hasFixedHeight: Boolean = false,
+    scrimColor: Color = BottomSheetDefaults.ScrimColor,
+    shape: Shape = BottomSheetDefaults.ExpandedShape,
+    containerColor: Color = MaterialTheme.colorScheme.surfaceContainerLow,
+    onDismissRequest: () -> Unit,
+    dragHandle: @Composable (() -> Unit)? = { BottomSheetDefaults.DragHandle() },
+    content: @Composable ColumnScope.(navigationBarPadding: Dp) -> Unit
+) {
+    val navigationBarPadding =
+        WindowInsets.navigationBars.asPaddingValues().calculateBottomPadding()
+
+    Box(Modifier.fillMaxSize()) {
+        ModalBottomSheet(
+            scrimColor = scrimColor,
+            dragHandle = dragHandle,
+            modifier = Modifier
+                .then(
+                    if (hasFixedHeight) Modifier.align(Alignment.BottomCenter)
+                    else Modifier
+                )
+                .fillMaxWidth()
+                .then(modifier),
+            onDismissRequest = {
+                onDismissRequest()
+            },
+            shape = shape,
+            sheetState = rememberModalBottomSheetState(true),
+            contentWindowInsets = { WindowInsets(0, 0, 0, 0) },
+            containerColor = containerColor
+        ) {
+            content(navigationBarPadding)
+        }
+    }
+}

app/src/main/java/ua/acclorite/book_story/presentation/components/CustomCheckbox.kt

@@ -11,7 +11,6 @@ import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.Dp
@@ -20,14 +19,21 @@ import ua.acclorite.book_story.R
 
 /**
  * Custom Checkbox. Has a Circle shape.
+ *
+ * @param selected Whether checked or not.
+ * @param containerColor Container color.
+ * @param size Size of the checkbox icon(not the whole checkbox).
  */
 @Composable
-fun CustomCheckbox(selected: Boolean, containerColor: Color, size: Dp = 22.dp) {
+fun CustomCheckbox(
+    selected: Boolean,
+    containerColor: Color,
+    size: Dp = 22.dp
+) {
     Icon(
         imageVector = Icons.Default.Check,
         tint = if (selected) containerColor else Color.Transparent,
         modifier = Modifier
-            .clip(CircleShape)
             .border(
                 width = if (!selected) 1.dp else 0.dp,
                 if (!selected) MaterialTheme.colorScheme.outline else Color.Transparent,

app/src/main/java/ua/acclorite/book_story/presentation/components/CustomSelectionContainer.kt

@@ -1,3 +1,5 @@
+@file:Suppress("DEPRECATION")
+
 package ua.acclorite.book_story.presentation.components
 
 import android.content.ClipData
@@ -7,6 +9,7 @@ import android.view.ActionMode
 import android.view.Menu
 import android.view.MenuItem
 import android.view.View
+import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.text.selection.SelectionContainer
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.CompositionLocalProvider
@@ -15,6 +18,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
 import androidx.compose.ui.geometry.Rect
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalTextToolbar
@@ -42,13 +46,13 @@ private class CustomTextActionModeCallback(
         requireNotNull(menu)
         requireNotNull(mode)
 
-        onTranslateRequested?.let {
+        onCopyRequested?.let {
-            menu.add(0, MENU_ITEM_TRANSLATE, 0, context.getString(R.string.translate))
+            menu.add(0, MENU_ITEM_COPY, 0, context.getString(R.string.copy))
                 .setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER)
         }
 
-        onCopyRequested?.let {
+        onTranslateRequested?.let {
-            menu.add(0, MENU_ITEM_COPY, 1, context.getString(R.string.copy))
+            menu.add(0, MENU_ITEM_TRANSLATE, 1, context.getString(R.string.translate))
                 .setShowAsAction(MenuItem.SHOW_AS_ACTION_NEVER)
         }
 
@@ -233,7 +237,7 @@ fun CustomSelectionContainer(
     CompositionLocalProvider(
         LocalTextToolbar provides customSelectionToolbar
     ) {
-        SelectionContainer {
+        SelectionContainer(Modifier.fillMaxSize()) {
             content(isToolbarHidden.value)
         }
     }

app/src/main/java/ua/acclorite/book_story/presentation/components/bottom_navigation_bar/BottomNavigationBar.kt

@@ -7,10 +7,7 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.setValue
-import androidx.compose.ui.res.painterResource
+import ua.acclorite.book_story.domain.util.Constants
-import androidx.compose.ui.res.stringResource
-import ua.acclorite.book_story.R
-import ua.acclorite.book_story.domain.model.NavigationItem
 import ua.acclorite.book_story.presentation.data.LocalNavigator
 import ua.acclorite.book_story.presentation.data.Screen
 
@@ -31,41 +28,13 @@ fun BottomNavigationBar() {
     }
 
     NavigationBar {
-
+        Constants.NAVIGATION_ITEMS.forEach {
-        BottomNavigationBarItem(
+            BottomNavigationBarItem(
-            item = NavigationItem(
+                item = it,
-                stringResource(id = R.string.library_screen),
+                isSelected = currentScreen == it.screen
-                selectedIcon = painterResource(id = R.drawable.library_screen_filled),
+            ) {
-                unselectedIcon = painterResource(id = R.drawable.library_screen_outlined)
+                navigator.navigate(it.screen, false)
-            ),
+            }
-            tooltipText = stringResource(id = R.string.library_content_desc),
-            isSelected = currentScreen == Screen.LIBRARY
-        ) {
-            navigator.navigate(Screen.LIBRARY, false)
-        }
-
-        BottomNavigationBarItem(
-            item = NavigationItem(
-                stringResource(id = R.string.history_screen),
-                selectedIcon = painterResource(id = R.drawable.history_screen_filled),
-                unselectedIcon = painterResource(id = R.drawable.history_screen_outlined)
-            ),
-            tooltipText = stringResource(id = R.string.history_content_desc),
-            isSelected = currentScreen == Screen.HISTORY
-        ) {
-            navigator.navigate(Screen.HISTORY, false)
-        }
-
-        BottomNavigationBarItem(
-            item = NavigationItem(
-                stringResource(id = R.string.browse_screen),
-                selectedIcon = painterResource(id = R.drawable.browse_screen_filled),
-                unselectedIcon = painterResource(id = R.drawable.browse_screen_outlined)
-            ),
-            tooltipText = stringResource(id = R.string.browse_content_desc),
-            isSelected = currentScreen == Screen.BROWSE
-        ) {
-            navigator.navigate(Screen.BROWSE, false)
         }
     }
 }

app/src/main/java/ua/acclorite/book_story/presentation/components/bottom_navigation_bar/BottomNavigationItem.kt

@@ -8,6 +8,8 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import ua.acclorite.book_story.domain.model.NavigationItem
@@ -15,12 +17,16 @@ import ua.acclorite.book_story.presentation.components.CustomTooltip
 
 /**
  * Bottom Navigation Bar Item, uses default [NavigationBarItem].
+ *
+ * @param modifier Modifier.
+ * @param item [NavigationItem].
+ * @param isSelected Whether this screen is currently selected.
+ * @param onClick OnClick callback.
  */
 @Composable
 fun RowScope.BottomNavigationBarItem(
     modifier: Modifier = Modifier,
     item: NavigationItem,
-    tooltipText: String,
     isSelected: Boolean,
     onClick: () -> Unit
 ) {
@@ -33,11 +39,11 @@ fun RowScope.BottomNavigationBarItem(
     NavigationBarItem(
         label = {
             CustomTooltip(
-                text = tooltipText,
+                text = stringResource(id = item.tooltip),
                 padding = 64.dp
             ) {
                 Text(
-                    text = item.title,
+                    text = stringResource(id = item.title),
                     maxLines = 1,
                     overflow = TextOverflow.Ellipsis
                 )
@@ -47,11 +53,11 @@ fun RowScope.BottomNavigationBarItem(
         onClick = { onClick() },
         icon = {
             CustomTooltip(
-                text = tooltipText,
+                text = stringResource(id = item.tooltip),
                 padding = 32.dp
             ) {
                 Icon(
-                    painter = icon,
+                    painter = painterResource(id = icon),
                     contentDescription = null,
                     modifier = Modifier.size(24.dp)
                 )

app/src/main/java/ua/acclorite/book_story/presentation/components/custom_dialog/CustomDialogWithLazyColumn.kt

@@ -2,7 +2,6 @@ package ua.acclorite.book_story.presentation.components.custom_dialog
 
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.layout.ExperimentalLayoutApi
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -57,7 +56,7 @@ import ua.acclorite.book_story.R
  * @param withDivider Should divider be shown or not.
  * @param items The items of this dialog, use items(..) { .. } or item { .. }.
  */
-@OptIn(ExperimentalMaterial3Api::class, ExperimentalLayoutApi::class)
+@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun CustomDialogWithLazyColumn(
     modifier: Modifier = Modifier,

app/src/main/java/ua/acclorite/book_story/presentation/components/custom_navigation_rail/CustomNavigationRail.kt

@@ -22,11 +22,8 @@ import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalLayoutDirection
-import androidx.compose.ui.res.painterResource
-import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
-import ua.acclorite.book_story.R
+import ua.acclorite.book_story.domain.util.Constants
-import ua.acclorite.book_story.domain.model.NavigationItem
 import ua.acclorite.book_story.presentation.data.LocalNavigator
 import ua.acclorite.book_story.presentation.data.Screen
 
@@ -69,38 +66,13 @@ fun BoxScope.CustomNavigationRail() {
             verticalArrangement = Arrangement.spacedBy(12.dp, Alignment.CenterVertically),
             horizontalAlignment = Alignment.CenterHorizontally
         ) {
-            CustomNavigationRailItem(
+            Constants.NAVIGATION_ITEMS.forEach {
-                item = NavigationItem(
+                CustomNavigationRailItem(
-                    stringResource(id = R.string.library_screen),
+                    item = it,
-                    selectedIcon = painterResource(id = R.drawable.library_screen_filled),
+                    isSelected = currentScreen == it.screen
-                    unselectedIcon = painterResource(id = R.drawable.library_screen_outlined)
+                ) {
-                ),
+                    navigator.navigate(it.screen, false)
-                tooltipText = stringResource(id = R.string.library_content_desc),
+                }
-                isSelected = currentScreen == Screen.LIBRARY
-            ) {
-                navigator.navigate(Screen.LIBRARY, false)
-            }
-            CustomNavigationRailItem(
-                item = NavigationItem(
-                    stringResource(id = R.string.history_screen),
-                    selectedIcon = painterResource(id = R.drawable.history_screen_filled),
-                    unselectedIcon = painterResource(id = R.drawable.history_screen_outlined)
-                ),
-                tooltipText = stringResource(id = R.string.history_content_desc),
-                isSelected = currentScreen == Screen.HISTORY
-            ) {
-                navigator.navigate(Screen.HISTORY, false)
-            }
-            CustomNavigationRailItem(
-                item = NavigationItem(
-                    stringResource(id = R.string.browse_screen),
-                    selectedIcon = painterResource(id = R.drawable.browse_screen_filled),
-                    unselectedIcon = painterResource(id = R.drawable.browse_screen_outlined)
-                ),
-                tooltipText = stringResource(id = R.string.browse_content_desc),
-                isSelected = currentScreen == Screen.BROWSE
-            ) {
-                navigator.navigate(Screen.BROWSE, false)
             }
         }
     }

app/src/main/java/ua/acclorite/book_story/presentation/components/custom_navigation_rail/CustomNavigationRailItem.kt

@@ -7,6 +7,8 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import ua.acclorite.book_story.domain.model.NavigationItem
@@ -14,12 +16,16 @@ import ua.acclorite.book_story.presentation.components.CustomTooltip
 
 /**
  * Custom Navigation Rail item.
+ *
+ * @param modifier Modifier.
+ * @param item [NavigationItem].
+ * @param isSelected Whether this screen is currently selected.
+ * @param onClick OnClick callback.
  */
 @Composable
 fun CustomNavigationRailItem(
     modifier: Modifier = Modifier,
     item: NavigationItem,
-    tooltipText: String,
     isSelected: Boolean,
     onClick: () -> Unit
 ) {
@@ -31,11 +37,11 @@ fun CustomNavigationRailItem(
     NavigationRailItem(
         label = {
             CustomTooltip(
-                text = tooltipText,
+                text = stringResource(id = item.tooltip),
                 padding = 48.dp
             ) {
                 Text(
-                    text = item.title,
+                    text = stringResource(id = item.title),
                     maxLines = 1,
                     overflow = TextOverflow.Ellipsis
                 )
@@ -45,11 +51,11 @@ fun CustomNavigationRailItem(
         onClick = { onClick() },
         icon = {
             CustomTooltip(
-                text = tooltipText,
+                text = stringResource(id = item.tooltip),
                 padding = 16.dp
             ) {
                 Icon(
-                    painter = icon,
+                    painter = painterResource(id = icon),
                     contentDescription = null,
                     modifier = Modifier.size(24.dp)
                 )

app/src/main/java/ua/acclorite/book_story/presentation/components/translator_language/TranslatorLanguageBottomSheet.kt

@@ -0,0 +1,320 @@
+package ua.acclorite.book_story.presentation.components.translator_language
+
+import androidx.compose.animation.core.tween
+import androidx.compose.animation.fadeOut
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxHeight
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.AutoAwesome
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Scaffold
+import androidx.compose.material3.TopAppBarDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.State
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.hilt.navigation.compose.hiltViewModel
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.domain.model.LanguageHistory
+import ua.acclorite.book_story.presentation.components.CategoryTitle
+import ua.acclorite.book_story.presentation.components.CustomAnimatedVisibility
+import ua.acclorite.book_story.presentation.components.CustomBottomSheet
+import ua.acclorite.book_story.presentation.components.customItems
+import ua.acclorite.book_story.presentation.components.is_messages.IsEmpty
+import ua.acclorite.book_story.presentation.components.translator_language.components.TranslatorLanguageDownloadDialog
+import ua.acclorite.book_story.presentation.components.translator_language.components.TranslatorLanguageItem
+import ua.acclorite.book_story.presentation.components.translator_language.components.TranslatorLanguageItemWithIcon
+import ua.acclorite.book_story.presentation.components.translator_language.components.TranslatorLanguageTopBar
+import ua.acclorite.book_story.presentation.components.translator_language.data.TranslatorLanguageEvent
+import ua.acclorite.book_story.presentation.components.translator_language.data.TranslatorLanguageState
+import ua.acclorite.book_story.presentation.components.translator_language.data.TranslatorLanguageViewModel
+import ua.acclorite.book_story.presentation.data.MainEvent
+import ua.acclorite.book_story.presentation.data.MainViewModel
+import ua.acclorite.book_story.presentation.ui.DefaultTransition
+import ua.acclorite.book_story.presentation.ui.Transitions
+
+/**
+ * Translator language bottom sheet.
+ * Manages downloading, deleting and selecting language for translator.
+ *
+ * @param selectedLanguage Current selected language.
+ * @param unselectedLanguage Current unselected language(second).
+ * @param translateFromSelecting Whether user selects "Translate from" or "Translate to" language.
+ * @param onDismiss Dismissing BottomSheet.
+ * @param onSelect Gives two variables, first - Translate from, second - Translate to. If user selects "Translate from" and then selects current unselected language(in this case "Translate to"), then it also changes "Translate to" to previous "Translate from" value.
+ */
+@Composable
+fun TranslatorLanguageBottomSheet(
+    selectedLanguage: String,
+    unselectedLanguage: String,
+    translateFromSelecting: Boolean,
+    onDismiss: () -> Unit,
+    onSelect: (String, String) -> Unit
+) {
+    val translatorLanguageViewModel: TranslatorLanguageViewModel = hiltViewModel()
+    val mainViewModel: MainViewModel = hiltViewModel()
+
+    val state = translatorLanguageViewModel.state.collectAsState()
+    val mainState = mainViewModel.state.collectAsState()
+
+    val loading = remember { mutableStateOf(true) }
+
+    LaunchedEffect(Unit) {
+        translatorLanguageViewModel.init(
+            selectedLanguage = selectedLanguage,
+            unselectedLanguage = unselectedLanguage,
+            translateFromSelecting = translateFromSelecting,
+            history = mainState.value.translatorLanguageHistory!!,
+            loaded = {
+                loading.value = false
+            }
+        )
+    }
+
+    TranslatorLanguageBottomSheetContent(
+        state = state,
+        loading = loading,
+        onSelect = { from, to ->
+            val fromSelecting = state.value.translateFromSelecting
+            val languageToChoose = if (fromSelecting) from else to
+
+            if (languageToChoose != "auto") {
+                val currentHistory = mainState.value.translatorLanguageHistory!!.toMutableList()
+                val langToAdd = state.value.languageToSelect
+                val newHistory = mutableListOf<LanguageHistory>()
+                val indexOfItem = currentHistory.indexOfFirst { it.languageCode == langToAdd }
+
+                if (indexOfItem != -1) {
+                    currentHistory.removeAt(indexOfItem)
+                }
+
+                currentHistory.add(0, LanguageHistory(0, langToAdd))
+
+                currentHistory.sortedBy { it.id }.forEachIndexed { index, languageHistory ->
+                    newHistory.add(LanguageHistory(index, languageHistory.languageCode))
+                }
+
+                mainViewModel.onEvent(
+                    MainEvent.OnChangeTranslatorLanguageHistory(
+                        newHistory
+                    )
+                )
+            }
+            onSelect(from, to)
+        },
+        onDismiss = onDismiss,
+        onEvent = translatorLanguageViewModel::onEvent
+    )
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun TranslatorLanguageBottomSheetContent(
+    state: State<TranslatorLanguageState>,
+    loading: State<Boolean>,
+    onSelect: (String, String) -> Unit,
+    onDismiss: () -> Unit,
+    onEvent: (TranslatorLanguageEvent) -> Unit
+) {
+    val scrollBehavior = TopAppBarDefaults.pinnedScrollBehavior()
+
+    val languagesWithHistory = remember(state.value.languages) {
+        state.value.languages.filter {
+            it.historyOrder != null
+        }.sortedBy {
+            it.historyOrder
+        }
+    }
+    val languages = remember(state.value.languages) {
+        state.value.languages.filter {
+            it.historyOrder == null
+        }.sortedBy {
+            it.languageCode
+        }
+    }
+
+    CustomBottomSheet(
+        hasFixedHeight = true,
+        modifier = Modifier
+            .fillMaxWidth()
+            .fillMaxHeight(),
+        dragHandle = {},
+        shape = RoundedCornerShape(0),
+        scrimColor = Color.Transparent,
+        onDismissRequest = {
+            onDismiss()
+        },
+        containerColor = MaterialTheme.colorScheme.surface
+    ) {
+        Scaffold(
+            modifier = Modifier
+                .fillMaxSize()
+                .nestedScroll(scrollBehavior.nestedScrollConnection),
+            containerColor = Color.Transparent,
+            topBar = {
+                TranslatorLanguageTopBar(
+                    state = state,
+                    scrollBehavior = scrollBehavior,
+                    onDismissBottomSheet = onDismiss,
+                    onEvent = onEvent
+                )
+            }
+        ) { paddingValues ->
+            Box(
+                modifier = Modifier
+                    .fillMaxSize()
+                    .padding(paddingValues),
+                contentAlignment = Alignment.Center
+            ) {
+                DefaultTransition(
+                    visible = !loading.value,
+                    modifier = Modifier.fillMaxSize()
+                ) {
+                    if (state.value.showDownloadLanguageDialog) {
+                        TranslatorLanguageDownloadDialog(
+                            state = state,
+                            onSelect = onSelect,
+                            onEvent = onEvent
+                        )
+                    }
+
+                    LazyColumn(Modifier.fillMaxSize()) {
+                        item {
+                            Spacer(
+                                modifier = Modifier
+                                    .animateItem()
+                                    .height(12.dp)
+                            )
+                        }
+
+                        if (
+                            state.value.translateFromSelecting &&
+                            (!state.value.showSearch || state.value.searchQuery.isEmpty())
+                        ) {
+                            item {
+                                val isSelected = remember(state.value.selectedLanguage) {
+                                    state.value.selectedLanguage == "auto"
+                                }
+
+                                TranslatorLanguageItemWithIcon(
+                                    isSelected = isSelected,
+                                    displayLanguage = stringResource(id = R.string.translator_auto),
+                                    customIcon = Icons.Default.AutoAwesome,
+                                    onSelect = {
+                                        onSelect("auto", state.value.unselectedLanguage)
+                                    }
+                                )
+
+                                Spacer(
+                                    modifier = Modifier
+                                        .animateItem()
+                                        .height(36.dp)
+                                )
+                            }
+                        }
+
+                        if (languagesWithHistory.isNotEmpty()) {
+                            item {
+                                CategoryTitle(
+                                    title = stringResource(id = R.string.translator_recent_languages),
+                                    color = MaterialTheme.colorScheme.primary,
+                                    padding = 28.dp,
+                                    modifier = Modifier.animateItem()
+                                )
+                                Spacer(
+                                    modifier = Modifier
+                                        .animateItem()
+                                        .height(14.dp)
+                                )
+                            }
+
+
+                            customItems(
+                                languagesWithHistory,
+                                key = { it.languageCode }
+                            ) { language ->
+                                TranslatorLanguageItem(
+                                    language = language,
+                                    onSelect = onSelect,
+                                    onEvent = onEvent
+                                )
+                            }
+                        }
+
+                        if (languages.isNotEmpty()) {
+                            item {
+                                if (languagesWithHistory.isNotEmpty()) {
+                                    Spacer(
+                                        modifier = Modifier
+                                            .animateItem()
+                                            .height(36.dp)
+                                    )
+                                }
+
+                                CategoryTitle(
+                                    title = stringResource(id = R.string.translator_all_languages),
+                                    color = MaterialTheme.colorScheme.primary,
+                                    padding = 28.dp,
+                                    modifier = Modifier.animateItem()
+                                )
+                                Spacer(
+                                    modifier = Modifier
+                                        .animateItem()
+                                        .height(14.dp)
+                                )
+                            }
+
+                            customItems(
+                                languages,
+                                key = { it.languageCode }
+                            ) { language ->
+                                TranslatorLanguageItem(
+                                    language = language,
+                                    onSelect = onSelect,
+                                    onEvent = onEvent
+                                )
+                            }
+                        }
+
+                        item {
+                            Spacer(
+                                modifier = Modifier
+                                    .animateItem()
+                                    .height(12.dp)
+                            )
+                        }
+                    }
+
+                    CustomAnimatedVisibility(
+                        visible = state.value.languages.isEmpty(),
+                        modifier = Modifier.align(Alignment.Center),
+                        enter = Transitions.DefaultTransitionIn,
+                        exit = fadeOut(tween(0))
+                    ) {
+                        IsEmpty(
+                            message = stringResource(id = R.string.translator_languages_empty),
+                            icon = painterResource(id = R.drawable.empty_languages)
+                        )
+                    }
+                }
+            }
+        }
+    }
+}

app/src/main/java/ua/acclorite/book_story/presentation/components/translator_language/components/TranslatorLanguageDownloadDialog.kt

@@ -0,0 +1,100 @@
+package ua.acclorite.book_story.presentation.components.translator_language.components
+
+import android.widget.Toast
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Download
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
+import androidx.compose.runtime.remember
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.presentation.components.custom_dialog.CustomDialogWithContent
+import ua.acclorite.book_story.presentation.components.translator_language.data.TranslatorLanguageEvent
+import ua.acclorite.book_story.presentation.components.translator_language.data.TranslatorLanguageState
+import java.util.Locale
+
+/**
+ * Translator Language Download Dialog.
+ * Used for downloading languages and selecting them right after.
+ *
+ * @param state [TranslatorLanguageState].
+ * @param onSelect OnSelect callback. Happens when language is downloaded.
+ * @param onEvent [TranslatorLanguageEvent] callback.
+ */
+@Composable
+fun TranslatorLanguageDownloadDialog(
+    state: State<TranslatorLanguageState>,
+    onSelect: (String, String) -> Unit,
+    onEvent: (TranslatorLanguageEvent) -> Unit
+) {
+    val context = LocalContext.current
+    val displayLanguage = remember(state.value.languageToSelect) {
+        val locale = Locale(state.value.languageToSelect)
+        locale.getDisplayLanguage(locale).replaceFirstChar {
+            it.uppercase()
+        }
+    }
+
+    CustomDialogWithContent(
+        title = stringResource(id = R.string.download_language, displayLanguage),
+        imageVectorIcon = Icons.Default.Download,
+        description = stringResource(
+            id = R.string.download_language_description
+        ),
+        actionText = stringResource(id = R.string.download),
+        isActionEnabled = true,
+        disableOnClick = true,
+        onDismiss = { onEvent(TranslatorLanguageEvent.OnDismissDownloadDialog) },
+        onAction = {
+            val selectedLanguage = state.value.languageToSelect
+
+            onEvent(TranslatorLanguageEvent.OnDismissDownloadDialog)
+            onEvent(
+                TranslatorLanguageEvent.OnDownloadLanguage(
+                    languageCode = state.value.languageToSelect,
+                    onComplete = {
+                        if (selectedLanguage == state.value.languageToSelect) {
+                            withContext(Dispatchers.Main) {
+                                Toast.makeText(
+                                    context,
+                                    context.getString(R.string.language_downloaded),
+                                    Toast.LENGTH_LONG
+                                ).show()
+                            }
+
+                            onEvent(
+                                TranslatorLanguageEvent.OnSelectLanguage(
+                                    languageCode = state.value.languageToSelect,
+                                    onSelect = onSelect,
+                                    onError = {
+                                        Toast
+                                            .makeText(
+                                                context,
+                                                it.asString(context),
+                                                Toast.LENGTH_LONG
+                                            )
+                                            .show()
+                                    }
+                                )
+                            )
+                        }
+                    },
+                    onFailure = {
+                        Toast.makeText(
+                            context,
+                            context.getString(
+                                R.string.error_query,
+                                it.message
+                            ),
+                            Toast.LENGTH_LONG
+                        ).show()
+                    }
+                )
+            )
+        },
+        withDivider = false
+    )
+}

app/src/main/java/ua/acclorite/book_story/presentation/components/translator_language/components/TranslatorLanguageItem.kt

@@ -0,0 +1,243 @@
+package ua.acclorite.book_story.presentation.components.translator_language.components
+
+import android.widget.Toast
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyItemScope
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Check
+import androidx.compose.material.icons.filled.CheckCircle
+import androidx.compose.material.icons.filled.Download
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.domain.model.Language
+import ua.acclorite.book_story.presentation.components.translator_language.data.TranslatorLanguageEvent
+import ua.acclorite.book_story.presentation.ui.DefaultTransition
+
+/**
+ * Translator Language Item with Icon.
+ *
+ * @param isSelected Whether item is selected.
+ * @param displayLanguage Display language to be shown.
+ * @param customIcon Icon.
+ * @param onSelect OnSelect(click) callback.
+ */
+@Composable
+fun LazyItemScope.TranslatorLanguageItemWithIcon(
+    isSelected: Boolean,
+    displayLanguage: String,
+    customIcon: ImageVector,
+    onSelect: () -> Unit,
+) {
+    Row(
+        modifier = Modifier
+            .animateItem()
+            .padding(horizontal = 12.dp)
+            .clip(RoundedCornerShape(100))
+            .background(
+                if (isSelected) MaterialTheme.colorScheme.primaryContainer
+                else Color.Transparent,
+                RoundedCornerShape(100)
+            )
+            .clickable {
+                onSelect()
+            }
+            .padding(horizontal = 16.dp, vertical = 14.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        if (isSelected) {
+            Icon(
+                imageVector = Icons.Default.Check,
+                contentDescription = stringResource(R.string.selected_content_desc),
+                tint = MaterialTheme.colorScheme.onPrimaryContainer,
+                modifier = Modifier.size(24.dp)
+            )
+            Spacer(modifier = Modifier.width(16.dp))
+        }
+
+        Text(
+            displayLanguage,
+            color = if (isSelected) MaterialTheme.colorScheme.onPrimaryContainer
+            else MaterialTheme.colorScheme.onSurface,
+            style = MaterialTheme.typography.bodyLarge,
+            modifier = Modifier.weight(1f)
+        )
+
+        Spacer(modifier = Modifier.width(16.dp))
+        Icon(
+            imageVector = customIcon,
+            contentDescription = null,
+            tint = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.size(24.dp)
+        )
+    }
+}
+
+/**
+ * Translator Language Item with Icon.
+ *
+ * @param language [Language] item.
+ * @param onSelect OnSelect(click) callback.
+ * @param onEvent [TranslatorLanguageEvent] callback.
+ */
+@Composable
+fun LazyItemScope.TranslatorLanguageItem(
+    language: Language,
+    onSelect: (String, String) -> Unit,
+    onEvent: (TranslatorLanguageEvent) -> Unit
+) {
+    val context = LocalContext.current
+
+    Row(
+        modifier = Modifier
+            .animateItem()
+            .padding(horizontal = 12.dp)
+            .clip(RoundedCornerShape(100))
+            .background(
+                if (language.isSelected) MaterialTheme.colorScheme.primaryContainer
+                else Color.Transparent,
+                RoundedCornerShape(100)
+            )
+            .clickable(enabled = !language.isDownloading) {
+                onEvent(
+                    TranslatorLanguageEvent.OnSelectLanguage(
+                        languageCode = language.languageCode,
+                        onSelect = onSelect,
+                        onError = {
+                            Toast
+                                .makeText(
+                                    context,
+                                    it.asString(context),
+                                    Toast.LENGTH_LONG
+                                )
+                                .show()
+                        }
+                    )
+                )
+            }
+            .padding(horizontal = 16.dp, vertical = 14.dp),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        if (language.isSelected) {
+            Icon(
+                imageVector = Icons.Default.Check,
+                contentDescription = stringResource(R.string.selected_content_desc),
+                tint = MaterialTheme.colorScheme.onPrimaryContainer,
+                modifier = Modifier.size(24.dp)
+            )
+            Spacer(modifier = Modifier.width(16.dp))
+        }
+
+        Text(
+            language.displayLanguage,
+            color = if (language.isSelected) MaterialTheme.colorScheme.onPrimaryContainer
+            else MaterialTheme.colorScheme.onSurface,
+            style = MaterialTheme.typography.bodyLarge,
+            modifier = Modifier.weight(1f)
+        )
+
+        Box(contentAlignment = Alignment.CenterEnd) {
+            DefaultTransition(!language.isDownloaded && !language.isDownloading) {
+                Row {
+                    Spacer(modifier = Modifier.width(16.dp))
+                    Icon(
+                        imageVector = Icons.Default.Download,
+                        contentDescription = stringResource(id = R.string.download),
+                        tint = if (language.isSelected) MaterialTheme.colorScheme.onSurfaceVariant
+                        else MaterialTheme.colorScheme.primary,
+                        modifier = Modifier
+                            .size(24.dp)
+                            .clickable(
+                                interactionSource = null,
+                                indication = null
+                            ) {
+                                onEvent(
+                                    TranslatorLanguageEvent.OnDownloadLanguage(
+                                        languageCode = language.languageCode,
+                                        onComplete = {},
+                                        onFailure = {
+                                            Toast
+                                                .makeText(
+                                                    context,
+                                                    context.getString(
+                                                        R.string.error_query,
+                                                        it.message
+                                                    ),
+                                                    Toast.LENGTH_LONG
+                                                )
+                                                .show()
+                                        }
+                                    )
+                                )
+                            }
+                    )
+                }
+            }
+
+            DefaultTransition(language.isDownloading && !language.isDownloaded) {
+                Row {
+                    Spacer(modifier = Modifier.width(16.dp))
+                    CircularProgressIndicator(
+                        strokeWidth = 2.7.dp,
+                        modifier = Modifier
+                            .size(22.dp)
+                            .clickable(
+                                interactionSource = null,
+                                indication = null
+                            ) {
+                                onEvent(
+                                    TranslatorLanguageEvent.OnCancelDownload(
+                                        languageCode = language.languageCode
+                                    )
+                                )
+                            },
+                        color = MaterialTheme.colorScheme.onSurfaceVariant
+                    )
+                    Spacer(modifier = Modifier.width(1.dp))
+                }
+            }
+
+            DefaultTransition(language.isDownloaded && !language.isDownloading) {
+                Row {
+                    Spacer(modifier = Modifier.width(16.dp))
+                    Icon(
+                        imageVector = Icons.Filled.CheckCircle,
+                        contentDescription = stringResource(id = R.string.done),
+                        tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                        modifier = Modifier
+                            .size(24.dp)
+                            .clickable(
+                                interactionSource = null,
+                                indication = null
+                            ) {
+                                onEvent(
+                                    TranslatorLanguageEvent.OnDeleteLanguage(
+                                        languageCode = language.languageCode
+                                    )
+                                )
+                            }
+                    )
+                }
+            }
+        }
+    }
+}

app/src/main/java/ua/acclorite/book_story/presentation/components/translator_language/components/TranslatorLanguageTopBar.kt

@@ -0,0 +1,107 @@
+@file:OptIn(ExperimentalMaterial3Api::class)
+
+package ua.acclorite.book_story.presentation.components.translator_language.components
+
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.filled.Close
+import androidx.compose.material.icons.filled.Search
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBarScrollBehavior
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.focus.FocusRequester
+import androidx.compose.ui.focus.focusRequester
+import androidx.compose.ui.layout.onGloballyPositioned
+import androidx.compose.ui.res.stringResource
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.presentation.components.AnimatedTopAppBar
+import ua.acclorite.book_story.presentation.components.CustomIconButton
+import ua.acclorite.book_story.presentation.components.CustomSearchTextField
+import ua.acclorite.book_story.presentation.components.translator_language.data.TranslatorLanguageEvent
+import ua.acclorite.book_story.presentation.components.translator_language.data.TranslatorLanguageState
+
+/**
+ * Translator Language TopBar.
+ *
+ * @param state [TranslatorLanguageState].
+ * @param scrollBehavior [TopAppBarScrollBehavior].
+ * @param onDismissBottomSheet OnDismiss callback.
+ * @param onEvent [TranslatorLanguageEvent] callback.
+ */
+@Composable
+fun TranslatorLanguageTopBar(
+    state: State<TranslatorLanguageState>,
+    scrollBehavior: TopAppBarScrollBehavior,
+    onDismissBottomSheet: () -> Unit,
+    onEvent: (TranslatorLanguageEvent) -> Unit
+) {
+    val focusRequester = remember { FocusRequester() }
+
+    AnimatedTopAppBar(
+        scrollBehavior = scrollBehavior,
+        isTopBarScrolled = null,
+
+        content1Visibility = !state.value.showSearch,
+        content1NavigationIcon = {
+            CustomIconButton(
+                icon = Icons.Default.Close,
+                contentDescription = R.string.go_back_content_desc,
+                disableOnClick = true
+            ) {
+                onDismissBottomSheet()
+            }
+        },
+        content1Title = {
+            Text(
+                text = stringResource(
+                    id = R.string.translator_query, stringResource(
+                        if (state.value.translateFromSelecting) R.string.translator_from
+                        else R.string.translator_to
+                    )
+                )
+            )
+        },
+        content1Actions = {
+            CustomIconButton(
+                icon = Icons.Default.Search,
+                contentDescription = R.string.search_content_desc,
+                disableOnClick = true
+            ) {
+                onEvent(TranslatorLanguageEvent.OnSearchShowHide)
+            }
+        },
+
+        content2Visibility = state.value.showSearch,
+        content2NavigationIcon = {
+            CustomIconButton(
+                icon = Icons.AutoMirrored.Default.ArrowBack,
+                contentDescription = R.string.exit_search_content_desc,
+                disableOnClick = true
+            ) {
+                onEvent(TranslatorLanguageEvent.OnSearchShowHide)
+            }
+        },
+        content2Title = {
+            CustomSearchTextField(
+                modifier = Modifier
+                    .focusRequester(focusRequester)
+                    .onGloballyPositioned {
+                        onEvent(TranslatorLanguageEvent.OnRequestFocus(focusRequester))
+                    },
+                query = state.value.searchQuery,
+                onQueryChange = {
+                    onEvent(TranslatorLanguageEvent.OnSearchQueryChange(it))
+                },
+                onSearch = { onEvent(TranslatorLanguageEvent.OnSearch) },
+                placeholder = stringResource(
+                    id = R.string.search_query,
+                    stringResource(id = R.string.languages)
+                )
+            )
+        }
+    )
+}

app/src/main/java/ua/acclorite/book_story/presentation/components/translator_language/data/TranslatorLanguageEvent.kt

@@ -0,0 +1,39 @@
+package ua.acclorite.book_story.presentation.components.translator_language.data
+
+import androidx.compose.runtime.Immutable
+import androidx.compose.ui.focus.FocusRequester
+import ua.acclorite.book_story.domain.model.Language
+import ua.acclorite.book_story.domain.util.UIText
+
+@Immutable
+sealed class TranslatorLanguageEvent {
+    data class OnSelectLanguage(
+        val languageCode: String,
+        val onError: suspend (UIText) -> Unit,
+        val onSelect: (String, String) -> Unit
+    ) : TranslatorLanguageEvent()
+
+    data class OnDownloadLanguage(
+        val languageCode: String,
+        val onComplete: suspend () -> Unit,
+        val onFailure: (Exception) -> Unit
+    ) : TranslatorLanguageEvent()
+
+    data class OnCancelDownload(
+        val languageCode: String
+    ) : TranslatorLanguageEvent()
+
+    data class OnDeleteLanguage(
+        val languageCode: String
+    ) : TranslatorLanguageEvent()
+
+    data object OnSearchShowHide : TranslatorLanguageEvent()
+    data class OnRequestFocus(val focusRequester: FocusRequester) : TranslatorLanguageEvent()
+    data class OnSearchQueryChange(val query: String) : TranslatorLanguageEvent()
+    data object OnSearch : TranslatorLanguageEvent()
+    data object OnDismissDownloadDialog : TranslatorLanguageEvent()
+    data class OnUpdateLanguage(
+        val languageCode: String,
+        val block: (Language) -> Language
+    ) : TranslatorLanguageEvent()
+}

app/src/main/java/ua/acclorite/book_story/presentation/components/translator_language/data/TranslatorLanguageState.kt

@@ -0,0 +1,21 @@
+package ua.acclorite.book_story.presentation.components.translator_language.data
+
+import androidx.compose.runtime.Immutable
+import ua.acclorite.book_story.domain.model.Language
+
+@Immutable
+data class TranslatorLanguageState(
+    val selectedLanguage: String = "",
+    val unselectedLanguage: String = "",
+    val languageToSelect: String = "",
+    val translateFromSelecting: Boolean = false,
+    val showDownloadLanguageDialog: Boolean = false,
+
+    val unfilteredLanguages: List<Language> = emptyList(),
+    val languages: List<Language> = emptyList(),
+
+    val showSearch: Boolean = false,
+    val searchQuery: String = "",
+    val hasFocused: Boolean = false,
+
+    )

app/src/main/java/ua/acclorite/book_story/presentation/components/translator_language/data/TranslatorLanguageViewModel.kt

@@ -0,0 +1,424 @@
+package ua.acclorite.book_story.presentation.components.translator_language.data
+
+import androidx.lifecycle.ViewModel
+import androidx.lifecycle.viewModelScope
+import com.google.mlkit.nl.translate.TranslateLanguage
+import dagger.hilt.android.lifecycle.HiltViewModel
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.yield
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.domain.model.Language
+import ua.acclorite.book_story.domain.model.LanguageHistory
+import ua.acclorite.book_story.domain.use_case.DeleteLanguageModel
+import ua.acclorite.book_story.domain.use_case.DownloadLanguageModel
+import ua.acclorite.book_story.domain.use_case.IsLanguageModelDownloaded
+import ua.acclorite.book_story.domain.util.UIText
+import java.util.Locale
+import javax.inject.Inject
+
+@HiltViewModel
+class TranslatorLanguageViewModel @Inject constructor(
+    private val isLanguageModelDownloaded: IsLanguageModelDownloaded,
+    private val downloadLanguageModel: DownloadLanguageModel,
+    private val deleteLanguageModel: DeleteLanguageModel
+) : ViewModel() {
+
+    private val _state = MutableStateFlow(TranslatorLanguageState())
+    val state = _state.asStateFlow()
+
+    private var job: Job? = null
+
+    @Suppress("LABEL_NAME_CLASH")
+    fun onEvent(event: TranslatorLanguageEvent) {
+        when (event) {
+            is TranslatorLanguageEvent.OnSelectLanguage -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    if (_state.value.showDownloadLanguageDialog) {
+                        return@launch
+                    }
+
+                    val isDownloaded = isLanguageModelDownloaded.execute(
+                        event.languageCode
+                    )
+
+                    _state.update {
+                        it.copy(
+                            languageToSelect = event.languageCode
+                        )
+                    }
+
+                    onEvent(
+                        TranslatorLanguageEvent.OnUpdateLanguage(event.languageCode) {
+                            it.copy(
+                                isDownloaded = isDownloaded
+                            )
+                        }
+                    )
+
+                    if (isDownloaded) {
+                        val from = _state.value.translateFromSelecting
+                        val langToSelect = _state.value.languageToSelect
+                        val unselectedLang = _state.value.unselectedLanguage
+                        val selectedLang = _state.value.selectedLanguage
+
+                        val translateFrom: String
+                        val translateTo: String
+
+                        if (langToSelect == unselectedLang) {
+                            if (from) {
+                                if (selectedLang == "auto") {
+                                    launch(Dispatchers.Main) {
+                                        event.onError(
+                                            UIText.StringResource(R.string.error_cannot_select_language)
+                                        )
+                                    }
+                                    return@launch
+                                }
+
+                                translateFrom = langToSelect
+                                translateTo = selectedLang
+                            } else {
+                                translateTo = langToSelect
+                                translateFrom = selectedLang
+                            }
+                        } else {
+                            if (from) {
+                                translateFrom = langToSelect
+                                translateTo = unselectedLang
+                            } else {
+                                translateTo = langToSelect
+                                translateFrom = unselectedLang
+                            }
+                        }
+
+                        if (translateTo == "auto") {
+                            launch(Dispatchers.Main) {
+                                event.onError(
+                                    UIText.StringResource(R.string.error_wrong_language)
+                                )
+                            }
+                            return@launch
+                        }
+
+                        event.onSelect(
+                            translateFrom,
+                            translateTo
+                        )
+                        return@launch
+                    }
+
+                    _state.update {
+                        it.copy(
+                            showDownloadLanguageDialog = true
+                        )
+                    }
+                }
+            }
+
+            is TranslatorLanguageEvent.OnDownloadLanguage -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    onEvent(
+                        TranslatorLanguageEvent.OnUpdateLanguage(event.languageCode) {
+                            it.copy(
+                                isDownloading = true,
+                                isCanceled = false
+                            )
+                        }
+                    )
+
+                    val isDownloaded = isLanguageModelDownloaded.execute(
+                        event.languageCode
+                    )
+
+                    onEvent(
+                        TranslatorLanguageEvent.OnUpdateLanguage(event.languageCode) {
+                            it.copy(
+                                isDownloaded = isDownloaded
+                            )
+                        }
+                    )
+
+                    if (isDownloaded) {
+                        onEvent(
+                            TranslatorLanguageEvent.OnUpdateLanguage(event.languageCode) {
+                                it.copy(
+                                    isDownloading = false
+                                )
+                            }
+                        )
+                        return@launch
+                    }
+
+                    downloadLanguageModel.execute(
+                        languageCode = event.languageCode,
+                        onCompleted = {
+                            viewModelScope.launch(Dispatchers.IO) {
+                                val modelDownloaded = isLanguageModelDownloaded.execute(
+                                    event.languageCode
+                                )
+
+                                onEvent(
+                                    TranslatorLanguageEvent.OnUpdateLanguage(event.languageCode) {
+                                        it.copy(
+                                            isDownloading = false,
+                                            isDownloaded = modelDownloaded
+                                        )
+                                    }
+                                )
+
+                                val isCanceled = _state.value.unfilteredLanguages.find {
+                                    it.languageCode == event.languageCode
+                                }?.isCanceled
+
+                                if (isCanceled == true && modelDownloaded) {
+                                    deleteLanguageModel.execute(
+                                        languageCode = event.languageCode
+                                    )
+                                    onEvent(
+                                        TranslatorLanguageEvent.OnUpdateLanguage(event.languageCode) {
+                                            it.copy(
+                                                isDownloading = false,
+                                                isDownloaded = false,
+                                                isCanceled = false
+                                            )
+                                        }
+                                    )
+                                    return@launch
+                                }
+
+                                event.onComplete()
+                            }
+                        },
+                        onFailure = {
+                            event.onFailure(it)
+                        }
+                    )
+                }
+            }
+
+            is TranslatorLanguageEvent.OnCancelDownload -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    onEvent(
+                        TranslatorLanguageEvent.OnUpdateLanguage(event.languageCode) {
+                            it.copy(
+                                isDownloaded = false,
+                                isDownloading = false,
+                                isCanceled = true
+                            )
+                        }
+                    )
+                }
+            }
+
+            is TranslatorLanguageEvent.OnDeleteLanguage -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    val deleted = deleteLanguageModel.execute(event.languageCode)
+
+                    if (deleted) {
+                        onEvent(
+                            TranslatorLanguageEvent.OnUpdateLanguage(event.languageCode) {
+                                it.copy(
+                                    isDownloaded = false,
+                                    isDownloading = false
+                                )
+                            }
+                        )
+                    }
+                }
+            }
+
+            is TranslatorLanguageEvent.OnSearchShowHide -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    val shouldHide = _state.value.showSearch
+
+                    if (shouldHide) {
+                        filterLanguages("")
+                    } else {
+                        _state.update {
+                            it.copy(
+                                searchQuery = "",
+                                hasFocused = false
+                            )
+                        }
+                    }
+
+                    _state.update {
+                        it.copy(
+                            showSearch = !shouldHide
+                        )
+                    }
+                }
+            }
+
+            is TranslatorLanguageEvent.OnSearchQueryChange -> {
+                _state.update {
+                    it.copy(
+                        searchQuery = event.query
+                    )
+                }
+                job?.cancel()
+                job = viewModelScope.launch(Dispatchers.IO) {
+                    delay(500)
+                    yield()
+                    onEvent(TranslatorLanguageEvent.OnSearch)
+                }
+            }
+
+            is TranslatorLanguageEvent.OnSearch -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    filterLanguages()
+                }
+            }
+
+            is TranslatorLanguageEvent.OnRequestFocus -> {
+                if (!_state.value.hasFocused) {
+                    event.focusRequester.requestFocus()
+                    _state.update {
+                        it.copy(
+                            hasFocused = true
+                        )
+                    }
+                }
+            }
+
+            is TranslatorLanguageEvent.OnDismissDownloadDialog -> {
+                _state.update {
+                    it.copy(
+                        showDownloadLanguageDialog = false
+                    )
+                }
+            }
+
+            is TranslatorLanguageEvent.OnUpdateLanguage -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    val unfilteredLanguages = _state.value.unfilteredLanguages.map {
+                        if (it.languageCode == event.languageCode) {
+                            event.block(it)
+                        } else {
+                            it
+                        }
+                    }
+
+                    _state.update {
+                        it.copy(
+                            unfilteredLanguages = unfilteredLanguages
+                        )
+                    }
+                    filterLanguages()
+                }
+            }
+        }
+    }
+
+    fun init(
+        selectedLanguage: String,
+        unselectedLanguage: String,
+        translateFromSelecting: Boolean,
+        history: List<LanguageHistory>,
+        loaded: () -> Unit
+    ) {
+        viewModelScope.launch(Dispatchers.IO) {
+            val oldState = _state.value
+            _state.update {
+                TranslatorLanguageState()
+            }
+
+            val unfilteredLanguages = TranslateLanguage.getAllLanguages()
+                .filter {
+                    if (it == "ru") {
+                        return@filter false
+                    }
+
+                    true
+                }
+                .map { languageCode ->
+                    val previousLanguage = oldState.languages.find {
+                        it.languageCode == languageCode
+                    }
+
+                    val locale = Locale(languageCode)
+                    val displayLanguage = locale.getDisplayLanguage(locale).replaceFirstChar {
+                        it.uppercase()
+                    }
+
+                    val isDownloading = previousLanguage?.isDownloading ?: false
+                    val isCancelled = previousLanguage?.isCanceled ?: false
+                    val isSelected = selectedLanguage == languageCode
+
+                    val historyOrder = history.find {
+                        it.languageCode == languageCode
+                    }?.id
+
+                    Language(
+                        languageCode = languageCode,
+                        displayLanguage = displayLanguage,
+                        isDownloading = isDownloading,
+                        isDownloaded = false,
+                        isCanceled = isCancelled,
+                        isSelected = isSelected,
+                        historyOrder = historyOrder
+                    )
+                }
+
+
+            _state.update {
+                it.copy(
+                    selectedLanguage = selectedLanguage,
+                    unselectedLanguage = unselectedLanguage,
+                    translateFromSelecting = translateFromSelecting,
+                    unfilteredLanguages = unfilteredLanguages
+                )
+            }
+            filterLanguages()
+            loaded()
+            loadDownloadedState()
+        }
+    }
+
+    private suspend fun loadDownloadedState() {
+        viewModelScope.launch(Dispatchers.IO) {
+            _state.value.unfilteredLanguages.map { language ->
+                val isDownloaded = isLanguageModelDownloaded.execute(
+                    language.languageCode
+                )
+                val isDownloading = if (isDownloaded) false else null
+
+                onEvent(
+                    TranslatorLanguageEvent.OnUpdateLanguage(
+                        languageCode = language.languageCode,
+                        block = {
+                            it.copy(
+                                isDownloaded = isDownloaded,
+                                isDownloading = isDownloading ?: it.isDownloading
+                            )
+                        }
+                    )
+                )
+            }
+        }
+    }
+
+    private fun filterLanguages(
+        query: String = if (_state.value.showSearch) _state.value.searchQuery else ""
+    ) {
+        _state.update {
+            it.copy(
+                languages = it.unfilteredLanguages.filter { language ->
+                    if (query.isBlank()) {
+                        return@filter true
+                    }
+
+                    language.displayLanguage.lowercase().trim().contains(
+                        query.lowercase().trim()
+                    )
+                }
+            )
+        }
+    }
+}

app/src/main/java/ua/acclorite/book_story/presentation/data/ArithmeticOperations.kt

@@ -10,3 +10,61 @@ fun String.removeTrailingZero(): String {
 
 fun Double.removeDigits(digits: Int) = "%.${digits}f".format(this).replace(",", ".")
 
+fun <K, T> Map<K, T>.update(item: Pair<K, T>): Map<K, T> {
+    val keyExists = containsKey(item.first)
+
+    return if (!keyExists) this
+    else this.plus(item)
+}
+
+fun <K, T> Map<K, T>.update(items: List<Pair<K, T>>): Map<K, T> {
+    var map = this
+
+    for (item in items) {
+        map = map.update(item)
+    }
+
+    return map
+}
+
+fun <K, T> Map<K, T>.update(items: Map<K, T>): Map<K, T> {
+    var map = this
+
+    for (item in items) {
+        map = map.update(item.toPair())
+    }
+
+    return map
+}
+
+fun <K, T> Map<K, T>.updateWithCopy(
+    calculation: (T) -> T
+): Map<K, T> {
+    var map = this
+
+    for (item in this) {
+        map = map.update(item.key to calculation(item.value))
+    }
+
+    return map
+}
+
+fun <K, T> Map<K, T>.removeKeys(
+    keys: Set<K>
+): Map<K, T> {
+    val map = this.toMutableMap()
+
+    for (key in keys) {
+        map.remove(key)
+    }
+
+    return map.toMap()
+}
+
+fun <K, T> Map<K, T>.removeKey(
+    key: K
+): Map<K, T> {
+    val map = this.toMutableMap()
+    map.remove(key)
+    return map.toMap()
+}

app/src/main/java/ua/acclorite/book_story/presentation/data/MainEvent.kt

@@ -1,5 +1,7 @@
 package ua.acclorite.book_story.presentation.data
 
+import ua.acclorite.book_story.domain.model.LanguageHistory
+
 sealed class MainEvent {
     data class OnChangeLanguage(val lang: String) : MainEvent()
     data class OnChangeTheme(val theme: String) : MainEvent()
@@ -17,4 +19,9 @@ sealed class MainEvent {
     data class OnChangeShowStartScreen(val bool: Boolean) : MainEvent()
     data class OnChangeCheckForUpdates(val bool: Boolean) : MainEvent()
     data class OnChangeSidePadding(val sidePadding: Int) : MainEvent()
+    data class OnChangeEnableTranslator(val bool: Boolean) : MainEvent()
+    data class OnChangeTranslateFrom(val languageCode: String) : MainEvent()
+    data class OnChangeTranslateTo(val languageCode: String) : MainEvent()
+    data class OnChangeDoubleClickTranslation(val bool: Boolean) : MainEvent()
+    data class OnChangeTranslatorLanguageHistory(val history: List<LanguageHistory>) : MainEvent()
 }

app/src/main/java/ua/acclorite/book_story/presentation/data/MainState.kt

@@ -5,6 +5,12 @@ import android.os.Parcel
 import android.os.Parcelable
 import androidx.compose.runtime.Immutable
 import androidx.compose.ui.graphics.Color
+import com.google.mlkit.nl.translate.TranslateLanguage
+import com.squareup.moshi.JsonAdapter
+import com.squareup.moshi.Moshi
+import com.squareup.moshi.Types
+import com.squareup.moshi.kotlin.reflect.KotlinJsonAdapterFactory
+import ua.acclorite.book_story.domain.model.LanguageHistory
 import ua.acclorite.book_story.domain.util.Constants
 import ua.acclorite.book_story.domain.util.DataStoreConstants
 import ua.acclorite.book_story.presentation.ui.DarkTheme
@@ -17,8 +23,19 @@ import ua.acclorite.book_story.presentation.ui.toTheme
 import ua.acclorite.book_story.presentation.ui.toThemeContrast
 import java.util.Locale
 
+val translatorHistoryMoshi: JsonAdapter<List<LanguageHistory>> = Moshi
+    .Builder()
+    .add(KotlinJsonAdapterFactory())
+    .build()
+    .adapter(
+        Types.newParameterizedType(
+            List::class.java,
+            LanguageHistory::class.java
+        )
+    )
+
 /**
- * Main State. All app's settings are here. Wrapped in SavedStateHandle, so it won't reset.
+ * Main State. All app's settings/preferences/permanent-variables are here. Wrapped in SavedStateHandle, so it won't reset.
  */
 @Immutable
 data class MainState(
@@ -38,7 +55,13 @@ data class MainState(
     val showStartScreen: Boolean? = null,
     val checkForUpdates: Boolean? = null,
     val sidePadding: Int? = null,
+    val enableTranslator: Boolean? = null,
+    val translateFrom: String? = null,
+    val translateTo: String? = null,
+    val doubleClickTranslation: Boolean? = null,
+    val translatorLanguageHistory: List<LanguageHistory>? = null,
 ) : Parcelable {
+
     constructor(parcel: Parcel) : this(
         // String
         language = parcel.readString(),
@@ -75,6 +98,19 @@ data class MainState(
             .toInt() == 1 else null,
         // Int
         sidePadding = if (parcel.readByte().toInt() != 0) parcel.readInt() else null,
+        // Boolean
+        enableTranslator = if (parcel.readByte().toInt() != 0) parcel.readByte()
+            .toInt() == 1 else null,
+        // String
+        translateFrom = parcel.readString(),
+        // String
+        translateTo = parcel.readString(),
+        // Boolean
+        doubleClickTranslation = if (parcel.readByte().toInt() != 0) parcel.readByte()
+            .toInt() == 1 else null,
+        translatorLanguageHistory = parcel.readString()?.let {
+            translatorHistoryMoshi.fromJson(it)
+        }
     )
 
     override fun writeToParcel(parcel: Parcel, flags: Int) {
@@ -117,9 +153,21 @@ data class MainState(
         // Check For Updates
         parcel.writeByte((if (checkForUpdates != null) 1 else 0).toByte())
         checkForUpdates?.let { parcel.writeByte(if (it) 1 else 0) }
-        // Side padding
+        // Side Padding
         parcel.writeByte((if (sidePadding != null) 1 else 0).toByte())
         sidePadding?.let { parcel.writeInt(it) }
+        // Enable Translator
+        parcel.writeByte((if (enableTranslator != null) 1 else 0).toByte())
+        enableTranslator?.let { parcel.writeByte(if (it) 1 else 0) }
+        // Translate From
+        parcel.writeString(translateFrom)
+        // Translate To
+        parcel.writeString(translateTo)
+        // Double Click Translation
+        parcel.writeByte((if (doubleClickTranslation != null) 1 else 0).toByte())
+        doubleClickTranslation?.let { parcel.writeByte(if (it) 1 else 0) }
+        // Translator Language History
+        parcel.writeString(translatorHistoryMoshi.toJson(translatorLanguageHistory))
     }
 
     override fun describeContents(): Int {
@@ -140,7 +188,6 @@ data class MainState(
          */
         fun initialize(data: Map<String, Any>): MainState {
             DataStoreConstants.apply {
-
                 val language: String = data[LANGUAGE.name] as? String ?: if (
                     Constants.LANGUAGES.any { Locale.getDefault().language.take(2) == it.first }
                 ) {
@@ -195,6 +242,30 @@ data class MainState(
                 val sidePadding: Int = data[SIDE_PADDING.name] as? Int
                     ?: 6
 
+                val enableTranslator: Boolean = data[ENABLE_TRANSLATOR.name] as? Boolean
+                    ?: false
+
+                val translateFrom: String = data[TRANSLATE_FROM.name] as? String
+                    ?: "auto"
+
+                val translateTo: String = data[TRANSLATE_TO.name] as? String ?: if (
+                    TranslateLanguage.getAllLanguages().any { it == language }
+                ) {
+                    language
+                } else {
+                    "en"
+                }
+
+                val doubleClickTranslation: Boolean =
+                    data[DOUBLE_CLICK_TRANSLATION.name] as? Boolean
+                        ?: true
+
+                val translatorLanguageHistory: List<LanguageHistory> =
+                    (data[TRANSLATOR_LANGUAGE_HISTORY.name] as? String)?.let {
+                        translatorHistoryMoshi.fromJson(it)
+                    } ?: emptyList()
+
+
                 return MainState(
                     language = language,
                     theme = theme.toTheme(),
@@ -211,7 +282,12 @@ data class MainState(
                     paragraphHeight = paragraphHeight,
                     paragraphIndentation = paragraphIndentation,
                     checkForUpdates = checkForUpdates,
-                    sidePadding = sidePadding
+                    sidePadding = sidePadding,
+                    enableTranslator = enableTranslator,
+                    translateFrom = translateFrom,
+                    translateTo = translateTo,
+                    doubleClickTranslation = doubleClickTranslation,
+                    translatorLanguageHistory = translatorLanguageHistory
                 )
             }
         }

app/src/main/java/ua/acclorite/book_story/presentation/data/MainViewModel.kt

@@ -227,6 +227,66 @@ class MainViewModel @Inject constructor(
                     }
                 }
             }
+
+            is MainEvent.OnChangeEnableTranslator -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    setDatastore.execute(DataStoreConstants.ENABLE_TRANSLATOR, event.bool)
+                    updateStateWithSavedHandle {
+                        it.copy(
+                            enableTranslator = event.bool
+                        )
+                    }
+                }
+            }
+
+            is MainEvent.OnChangeTranslateFrom -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    setDatastore.execute(DataStoreConstants.TRANSLATE_FROM, event.languageCode)
+                    updateStateWithSavedHandle {
+                        it.copy(
+                            translateFrom = event.languageCode
+                        )
+                    }
+                }
+            }
+
+            is MainEvent.OnChangeTranslateTo -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    setDatastore.execute(DataStoreConstants.TRANSLATE_TO, event.languageCode)
+                    updateStateWithSavedHandle {
+                        it.copy(
+                            translateTo = event.languageCode
+                        )
+                    }
+                }
+            }
+
+            is MainEvent.OnChangeDoubleClickTranslation -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    setDatastore.execute(DataStoreConstants.DOUBLE_CLICK_TRANSLATION, event.bool)
+                    updateStateWithSavedHandle {
+                        it.copy(
+                            doubleClickTranslation = event.bool
+                        )
+                    }
+                }
+            }
+
+            is MainEvent.OnChangeTranslatorLanguageHistory -> {
+                viewModelScope.launch(Dispatchers.IO) {
+                    val historyJson = translatorHistoryMoshi.toJson(event.history)
+
+                    setDatastore.execute(
+                        DataStoreConstants.TRANSLATOR_LANGUAGE_HISTORY,
+                        historyJson
+                    )
+                    updateStateWithSavedHandle {
+                        it.copy(
+                            translatorLanguageHistory = event.history
+                        )
+                    }
+                }
+            }
         }
     }
 

app/src/main/java/ua/acclorite/book_story/presentation/screens/about/data/AboutState.kt

@@ -1,10 +1,10 @@
 package ua.acclorite.book_story.presentation.screens.about.data
 
 import androidx.compose.runtime.Immutable
-import ua.acclorite.book_story.data.remote.dto.ReleaseResponse
+import ua.acclorite.book_story.data.remote.dto.LatestReleaseInfo
 
 @Immutable
 data class AboutState(
     val showUpdateDialog: Boolean = false,
-    val updateInfo: ReleaseResponse? = null
+    val updateInfo: LatestReleaseInfo? = null
 )

app/src/main/java/ua/acclorite/book_story/presentation/screens/about/nested/credits/CreditsScreen.kt

@@ -7,7 +7,6 @@ import androidx.compose.foundation.layout.navigationBars
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.windowInsetsPadding
 import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.foundation.lazy.items
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.LargeTopAppBar
 import androidx.compose.material3.MaterialTheme
@@ -24,6 +23,7 @@ import ua.acclorite.book_story.R
 import ua.acclorite.book_story.domain.util.Constants
 import ua.acclorite.book_story.presentation.components.GoBackButton
 import ua.acclorite.book_story.presentation.components.collapsibleUntilExitScrollBehaviorWithLazyListState
+import ua.acclorite.book_story.presentation.components.customItems
 import ua.acclorite.book_story.presentation.data.LocalNavigator
 import ua.acclorite.book_story.presentation.data.Navigator
 import ua.acclorite.book_story.presentation.screens.about.data.AboutEvent
@@ -78,7 +78,7 @@ private fun CreditsScreen(
                 .padding(top = paddingValues.calculateTopPadding()),
             state = scrollState.second
         ) {
-            items(Constants.CREDITS, key = { it.name }) {
+            customItems(Constants.CREDITS, key = { it.name }) {
                 CreditItem(credit = it) {
                     onAboutNavigateEvent(
                         AboutEvent.OnNavigateToBrowserPage(

app/src/main/java/ua/acclorite/book_story/presentation/screens/about/nested/credits/components/CreditItem.kt

@@ -23,6 +23,11 @@ import ua.acclorite.book_story.domain.model.Credit
 
 /**
  * Credit Item.
+ *
+ * @param credit [Credit] item.
+ * @param horizontalPadding Horizontal item padding.
+ * @param verticalPadding Vertical item padding.
+ * @param onClick OnClick callback.
  */
 @OptIn(ExperimentalLayoutApi::class)
 @Composable
@@ -67,7 +72,7 @@ fun CreditItem(
                         overflow = TextOverflow.Ellipsis,
                         modifier = Modifier
                             .clip(RoundedCornerShape(100))
-                            .background(MaterialTheme.colorScheme.primary)
+                            .background(MaterialTheme.colorScheme.primary, RoundedCornerShape(100))
                             .padding(vertical = 4.dp, horizontal = 8.dp)
                     )
                 }

app/src/main/java/ua/acclorite/book_story/presentation/screens/about/nested/license_info/LicenseInfoScreen.kt

@@ -183,7 +183,10 @@ private fun LicenseInfoScreen(
                                 .clickable(enabled = license.licenseContent?.isNotBlank() == true) {
                                     showed.value = !showed.value
                                 }
-                                .background(MaterialTheme.colorScheme.primary)
+                                .background(
+                                    MaterialTheme.colorScheme.primary,
+                                    RoundedCornerShape(100)
+                                )
                                 .padding(vertical = 6.dp, horizontal = 12.dp)
                         )
 

app/src/main/java/ua/acclorite/book_story/presentation/screens/about/nested/licenses/components/LicenseItem.kt

@@ -27,6 +27,11 @@ import com.mikepenz.aboutlibraries.ui.compose.m3.util.author
 
 /**
  * License Item.
+ *
+ * @param modifier Modifier.
+ * @param library [Library] item.
+ * @param horizontalPadding Horizontal item padding.
+ * @param verticalPadding Vertical item padding.
  */
 @OptIn(ExperimentalLayoutApi::class)
 @Composable
@@ -85,7 +90,7 @@ fun LicenseItem(
                         overflow = TextOverflow.Ellipsis,
                         modifier = Modifier
                             .clip(RoundedCornerShape(100))
-                            .background(MaterialTheme.colorScheme.primary)
+                            .background(MaterialTheme.colorScheme.primary, RoundedCornerShape(100))
                             .padding(vertical = 4.dp, horizontal = 8.dp)
                     )
                 }

app/src/main/java/ua/acclorite/book_story/presentation/screens/book_info/components/BookInfoInfoSection.kt

@@ -45,7 +45,10 @@ import ua.acclorite.book_story.presentation.screens.book_info.data.BookInfoEvent
 import ua.acclorite.book_story.presentation.screens.book_info.data.BookInfoState
 
 /**
- * Info section.
+ * BookInfo's Info section.
+ *
+ * @param state [BookInfoState] instance.
+ * @param onEvent [BookInfoEvent] callback.
  */
 @OptIn(ExperimentalFoundationApi::class)
 @Composable
@@ -65,7 +68,10 @@ fun BookInfoInfoSection(
                 .height(195.dp)
                 .width(130.dp)
                 .clip(MaterialTheme.shapes.medium)
-                .background(MaterialTheme.colorScheme.surfaceContainerLow)
+                .background(
+                    MaterialTheme.colorScheme.surfaceContainerLow,
+                    MaterialTheme.shapes.medium
+                )
                 .combinedClickable(
                     interactionSource = remember { MutableInteractionSource() },
                     indication = null,

app/src/main/java/ua/acclorite/book_story/presentation/screens/book_info/components/change_cover_bottom_sheet/BookInfoChangeCoverBottomSheet.kt

@@ -5,18 +5,11 @@ import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.PickVisualMediaRequest
 import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.WindowInsets
-import androidx.compose.foundation.layout.asPaddingValues
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.navigationBars
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.HideImage
 import androidx.compose.material.icons.filled.ImageSearch
-import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.ModalBottomSheet
-import androidx.compose.material3.rememberModalBottomSheetState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.State
 import androidx.compose.ui.Modifier
@@ -24,6 +17,7 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import ua.acclorite.book_story.R
+import ua.acclorite.book_story.presentation.components.CustomBottomSheet
 import ua.acclorite.book_story.presentation.screens.book_info.data.BookInfoEvent
 import ua.acclorite.book_story.presentation.screens.book_info.data.BookInfoState
 import ua.acclorite.book_story.presentation.screens.history.data.HistoryEvent
@@ -31,8 +25,12 @@ import ua.acclorite.book_story.presentation.screens.library.data.LibraryEvent
 
 /**
  * Change cover bottom sheet. Lets user select photo from the gallery and replaces old one.
+ *
+ * @param state [BookInfoState] instance.
+ * @param onEvent [BookInfoEvent] callback.
+ * @param onLibraryUpdateEvent [LibraryEvent] callback.
+ * @param onHistoryUpdateEvent [HistoryEvent] callback.
  */
-@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun BookInfoChangeCoverBottomSheet(
     state: State<BookInfoState>,
@@ -41,8 +39,6 @@ fun BookInfoChangeCoverBottomSheet(
     onHistoryUpdateEvent: (HistoryEvent.OnUpdateBook) -> Unit
 ) {
     val context = LocalContext.current
-    val navigationBarPadding =
-        WindowInsets.navigationBars.asPaddingValues().calculateBottomPadding()
     val photoPicker = rememberLauncherForActivityResult(
         contract = ActivityResultContracts.PickVisualMedia(),
         onResult = { uri ->
@@ -66,16 +62,12 @@ fun BookInfoChangeCoverBottomSheet(
         }
     )
 
-    ModalBottomSheet(
+    CustomBottomSheet(
         modifier = Modifier.fillMaxWidth(),
         onDismissRequest = {
             onEvent(BookInfoEvent.OnShowHideChangeCoverBottomSheet)
-        },
+        }
-        sheetState = rememberModalBottomSheetState(true),
+    ) { padding ->
-        contentWindowInsets = { WindowInsets(0, 0, 0, 0) },
-        containerColor = MaterialTheme.colorScheme.surfaceContainerLow
-    ) {
-
         BookInfoChangeCoverBottomSheetItem(
             icon = Icons.Default.ImageSearch,
             text = stringResource(id = R.string.change_cover),
@@ -110,7 +102,7 @@ fun BookInfoChangeCoverBottomSheet(
 
         Spacer(
             modifier = Modifier.height(
-                8.dp + navigationBarPadding
+                8.dp + padding
             )
         )
     }

app/src/main/java/ua/acclorite/book_story/presentation/screens/book_info/components/details_bottom_sheet/BookInfoDetailsBottomSheet.kt

@@ -2,15 +2,8 @@ package ua.acclorite.book_story.presentation.screens.book_info.components.detail
 
 import android.widget.Toast
 import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.WindowInsets
-import androidx.compose.foundation.layout.asPaddingValues
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.navigationBars
-import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.ModalBottomSheet
-import androidx.compose.material3.rememberModalBottomSheetState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.State
 import androidx.compose.runtime.remember
@@ -19,6 +12,7 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.unit.dp
 import ua.acclorite.book_story.R
+import ua.acclorite.book_story.presentation.components.CustomBottomSheet
 import ua.acclorite.book_story.presentation.screens.book_info.data.BookInfoEvent
 import ua.acclorite.book_story.presentation.screens.book_info.data.BookInfoState
 import java.io.File
@@ -28,16 +22,16 @@ import java.util.Locale
 
 /**
  * Details bottom sheet. Displays name, path, last opened and size of the file.
+ *
+ * @param state [BookInfoState] instance.
+ * @param onEvent [BookInfoEvent] callback.
  */
-@OptIn(ExperimentalMaterial3Api::class)
 @Composable
 fun BookInfoDetailsBottomSheet(
     state: State<BookInfoState>,
     onEvent: (BookInfoEvent) -> Unit
 ) {
     val context = LocalContext.current
-    val navigationBarPadding =
-        WindowInsets.navigationBars.asPaddingValues().calculateBottomPadding()
 
     val pattern = remember {
         SimpleDateFormat("HH:mm dd MMM yyyy", Locale.getDefault())
@@ -66,14 +60,11 @@ fun BookInfoDetailsBottomSheet(
         else ""
     }
 
-    ModalBottomSheet(
+    CustomBottomSheet(
         modifier = Modifier.fillMaxWidth(),
         onDismissRequest = {
             onEvent(BookInfoEvent.OnShowHideDetailsBottomSheet)
-        },
+        }
-        sheetState = rememberModalBottomSheetState(true),
-        contentWindowInsets = { WindowInsets(0, 0, 0, 0) },
-        containerColor = MaterialTheme.colorScheme.surfaceContainerLow
     ) {
         BookInfoDetailsBottomSheetItem(
             title = stringResource(id = R.string.file_name),
@@ -151,7 +142,7 @@ fun BookInfoDetailsBottomSheet(
 
         Spacer(
             modifier = Modifier.height(
-                8.dp + navigationBarPadding
+                8.dp + it
             )
         )
     }

app/src/main/java/ua/acclorite/book_story/presentation/screens/book_info/data/BookInfoEvent.kt

@@ -7,7 +7,6 @@ import androidx.compose.runtime.Immutable
 import androidx.compose.ui.focus.FocusRequester
 import ua.acclorite.book_story.domain.model.Book
 import ua.acclorite.book_story.domain.model.Category
-import ua.acclorite.book_story.domain.model.StringWithId
 import ua.acclorite.book_story.presentation.data.Navigator
 
 @Immutable
@@ -58,7 +57,7 @@ sealed class BookInfoEvent {
     data object OnDismissConfirmUpdateDialog : BookInfoEvent()
 
     data class OnShowConfirmUpdateDialog(
-        val updatedBook: Pair<Book, List<StringWithId>>,
+        val updatedBook: Pair<Book, List<String>>,
         val authorUpdated: Boolean,
         val descriptionUpdated: Boolean,
         val textUpdated: Boolean,

app/src/main/java/ua/acclorite/book_story/presentation/screens/book_info/data/BookInfoState.kt

@@ -3,7 +3,6 @@ package ua.acclorite.book_story.presentation.screens.book_info.data
 import androidx.compose.runtime.Immutable
 import ua.acclorite.book_story.domain.model.Book
 import ua.acclorite.book_story.domain.model.Category
-import ua.acclorite.book_story.domain.model.StringWithId
 import ua.acclorite.book_story.domain.util.Constants
 
 @Immutable
@@ -13,7 +12,7 @@ data class BookInfoState(
     val isLoadingUpdate: Boolean = false,
     val isRefreshing: Boolean = false,
     val showConfirmUpdateDialog: Boolean = false,
-    val updatedBook: Pair<Book, List<StringWithId>>? = null,
+    val updatedBook: Pair<Book, List<String>>? = null,
     val authorChanged: Boolean = false,
     val descriptionChanged: Boolean = false,
     val textChanged: Boolean = false,

app/src/main/java/ua/acclorite/book_story/presentation/screens/book_info/data/BookInfoViewModel.kt

@@ -386,7 +386,7 @@ class BookInfoViewModel @Inject constructor(
                     val updatedText = updatedBook.text
                     val text = getText.execute(book.textPath)
 
-                    if (updatedText.map { it.line } != text.map { it.line }) {
+                    if (updatedText != text.map { it.value.originalLine }) {
                         textUpdated = true
                     }
 

app/src/main/java/ua/acclorite/book_story/presentation/screens/browse/components/BrowseFIleItem.kt

@@ -22,6 +22,7 @@ import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -41,6 +42,12 @@ import java.util.Locale
 
 /**
  * Browse list element item. Can be selected.
+ *
+ * @param file [File].
+ * @param hasSelectedFiles Whether parent list has selected items.
+ * @param modifier Modifier.
+ * @param onClick OnClick callback.
+ * @param onLongClick OnLongClick callback.
  */
 @OptIn(ExperimentalFoundationApi::class)
 @Composable
@@ -52,12 +59,12 @@ fun BrowseFileItem(
     onLongClick: () -> Unit
 ) {
     val pattern = remember { SimpleDateFormat("HH:mm dd MMM yyyy", Locale.getDefault()) }
-    val lastModified = remember { pattern.format(Date(file.first.lastModified())) }
+    val lastModified = rememberSaveable { pattern.format(Date(file.first.lastModified())) }
-    val sizeBytes = remember { file.first.length() }
+    val sizeBytes = rememberSaveable { file.first.length() }
 
-    val fileSizeKB = remember { if (sizeBytes > 0) sizeBytes.toDouble() / 1024.0 else 0.0 }
+    val fileSizeKB = rememberSaveable { if (sizeBytes > 0) sizeBytes.toDouble() / 1024.0 else 0.0 }
-    val fileSizeMB = remember { if (sizeBytes > 0) fileSizeKB / 1024.0 else 0.0 }
+    val fileSizeMB = rememberSaveable { if (sizeBytes > 0) fileSizeKB / 1024.0 else 0.0 }
-    val fileSize = remember {
+    val fileSize = rememberSaveable {
         if (fileSizeMB >= 1.0) "%.2f MB".format(fileSizeMB)
         else if (fileSizeMB > 0.0) "%.2f KB".format(fileSizeKB)
         else "0 KB"
@@ -74,7 +81,7 @@ fun BrowseFileItem(
             .fillMaxWidth()
             .padding(horizontal = 8.dp, vertical = 3.dp)
             .clip(RoundedCornerShape(10.dp))
-            .background(backgroundColor)
+            .background(backgroundColor, RoundedCornerShape(10.dp))
             .combinedClickable(
                 onLongClick = {
                     onLongClick()

app/src/main/java/ua/acclorite/book_story/presentation/screens/history/components/HistoryItem.kt

@@ -40,6 +40,14 @@ import java.util.Locale
 
 /**
  * History list element item.
+ *
+ * @param modifier Modifier.
+ * @param history [History] item.
+ * @param isOnClickEnabled Whether OnClick is enabled.
+ * @param onBodyClick OnBodyClick callback.
+ * @param onTitleClick OnTitleClick callback.
+ * @param isDeleteEnabled Whether Delete button is enabled.
+ * @param onDeleteClick OnDeleteClick callback.
  */
 @Composable
 fun HistoryItem(
@@ -73,8 +81,10 @@ fun HistoryItem(
                 modifier = Modifier
                     .height(90.dp)
                     .width(60.dp)
-                    .clip(RoundedCornerShape(10.dp))
+                    .background(
-                    .background(MaterialTheme.colorScheme.surfaceContainerLow)
+                        MaterialTheme.colorScheme.surfaceContainerLow,
+                        RoundedCornerShape(10.dp)
+                    )
             ) {
                 if (history.book?.coverImage != null) {
                     CustomCoverImage(

app/src/main/java/ua/acclorite/book_story/presentation/screens/library/LibraryScreen.kt

@@ -47,7 +47,6 @@ import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.draw.clip
 import androidx.compose.ui.focus.FocusRequester
 import androidx.compose.ui.focus.focusRequester
 import androidx.compose.ui.layout.onGloballyPositioned
@@ -179,8 +178,10 @@ private fun LibraryScreen(
                             Text(
                                 text = state.value.books.size.toString(),
                                 modifier = Modifier
-                                    .clip(RoundedCornerShape(14.dp))
+                                    .background(
-                                    .background(MaterialTheme.colorScheme.surfaceContainer)
+                                        MaterialTheme.colorScheme.surfaceContainer,
+                                        RoundedCornerShape(14.dp)
+                                    )
                                     .padding(horizontal = 8.dp, vertical = 3.dp),
                                 color = MaterialTheme.colorScheme.onSurfaceVariant,
                                 fontSize = 16.sp

app/src/main/java/ua/acclorite/book_story/presentation/screens/library/components/LibraryBookItem.kt

@@ -39,6 +39,12 @@ import ua.acclorite.book_story.presentation.data.removeTrailingZero
 
 /**
  * Library list element item.
+ *
+ * @param book [Pair] of [Book] and [Selected] (Boolean).
+ * @param modifier Modifier.
+ * @param onCoverImageClick OnCoverImageClick callback.
+ * @param onLongClick OnLongClick callback.
+ * @param onButtonClick OnButtonClick callback.
  */
 @OptIn(ExperimentalFoundationApi::class)
 @Composable
@@ -86,7 +92,10 @@ fun LibraryBookItem(
                 .aspectRatio(1f / 1.5f)
                 .fillMaxWidth()
                 .clip(MaterialTheme.shapes.medium)
-                .background(MaterialTheme.colorScheme.surfaceContainerLow)
+                .background(
+                    MaterialTheme.colorScheme.surfaceContainerLow,
+                    MaterialTheme.shapes.medium
+                )
                 .combinedClickable(
                     onClick = {
                         onCoverImageClick()
@@ -124,7 +133,7 @@ fun LibraryBookItem(
                 modifier = Modifier
                     .padding(6.dp)
                     .clip(MaterialTheme.shapes.small)
-                    .background(MaterialTheme.colorScheme.primary)
+                    .background(MaterialTheme.colorScheme.primary, MaterialTheme.shapes.small)
                     .padding(horizontal = 8.dp, vertical = 4.dp),
                 style = MaterialTheme.typography.bodySmall
             )

app/src/main/java/ua/acclorite/book_story/presentation/screens/library/components/LibraryTabRow.kt

@@ -21,7 +21,6 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.draw.clip
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.dp
@@ -113,8 +112,10 @@ fun LibraryTabRow(
                             Text(
                                 text = tabItem.second.toString(),
                                 modifier = Modifier
-                                    .clip(MaterialTheme.shapes.medium)
+                                    .background(
-                                    .background(MaterialTheme.colorScheme.surfaceContainer)
+                                        MaterialTheme.colorScheme.surfaceContainer,
+                                        MaterialTheme.shapes.medium
+                                    )
                                     .padding(horizontal = 8.dp, vertical = 4.dp),
                                 color = MaterialTheme.colorScheme.onSurfaceVariant,
                                 style = MaterialTheme.typography.bodyMedium

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/ReaderScreen.kt

@@ -15,10 +15,7 @@ import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.lazy.LazyColumn
-import androidx.compose.foundation.lazy.LazyListState
-import androidx.compose.foundation.lazy.rememberLazyListState
 import androidx.compose.foundation.text.selection.DisableSelection
 import androidx.compose.material3.LinearProgressIndicator
 import androidx.compose.material3.MaterialTheme
@@ -32,7 +29,6 @@ import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.runtime.snapshotFlow
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.geometry.Offset
@@ -42,24 +38,21 @@ import androidx.compose.ui.input.nestedscroll.NestedScrollConnection
 import androidx.compose.ui.input.nestedscroll.NestedScrollSource
 import androidx.compose.ui.input.nestedscroll.nestedScroll
 import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.res.painterResource
 import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.text.TextStyle
 import androidx.compose.ui.text.font.FontStyle
-import androidx.compose.ui.text.style.LineBreak
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.unit.sp
 import androidx.hilt.navigation.compose.hiltViewModel
-import kotlinx.coroutines.FlowPreview
-import kotlinx.coroutines.flow.collectLatest
-import kotlinx.coroutines.flow.debounce
 import ua.acclorite.book_story.R
 import ua.acclorite.book_story.domain.util.Constants
 import ua.acclorite.book_story.presentation.components.CustomAnimatedVisibility
 import ua.acclorite.book_story.presentation.components.CustomSelectionContainer
-import ua.acclorite.book_story.presentation.components.customItemsIndexed
+import ua.acclorite.book_story.presentation.components.customItems
 import ua.acclorite.book_story.presentation.components.is_messages.IsError
+import ua.acclorite.book_story.presentation.components.translator_language.TranslatorLanguageBottomSheet
 import ua.acclorite.book_story.presentation.data.LocalNavigator
 import ua.acclorite.book_story.presentation.data.MainEvent
 import ua.acclorite.book_story.presentation.data.MainState
@@ -72,8 +65,11 @@ import ua.acclorite.book_story.presentation.screens.library.data.LibraryViewMode
 import ua.acclorite.book_story.presentation.screens.reader.components.ReaderEndItem
 import ua.acclorite.book_story.presentation.screens.reader.components.app_bar.ReaderBottomBar
 import ua.acclorite.book_story.presentation.screens.reader.components.app_bar.ReaderTopBar
+import ua.acclorite.book_story.presentation.screens.reader.components.download_language_dialog.ReaderDownloadLanguageDialog
 import ua.acclorite.book_story.presentation.screens.reader.components.settings_bottom_sheet.ReaderSettingsBottomSheet
 import ua.acclorite.book_story.presentation.screens.reader.components.start_item.ReaderStartItem
+import ua.acclorite.book_story.presentation.screens.reader.components.text.ReaderTextParagraph
+import ua.acclorite.book_story.presentation.screens.reader.components.translator_bottom_sheet.ReaderTranslatorBottomSheet
 import ua.acclorite.book_story.presentation.screens.reader.data.ReaderEvent
 import ua.acclorite.book_story.presentation.screens.reader.data.ReaderState
 import ua.acclorite.book_story.presentation.screens.reader.data.ReaderViewModel
@@ -88,12 +84,27 @@ fun ReaderScreenRoot() {
     val libraryViewModel: LibraryViewModel = hiltViewModel()
     val historyViewModel: HistoryViewModel = hiltViewModel()
 
-    val listState = rememberLazyListState()
     val loading = remember { mutableStateOf(true) }
 
     val state = viewModel.state.collectAsState()
     val mainState = mainViewModel.state.collectAsState()
 
+    val canScroll by remember {
+        derivedStateOf {
+            state.value.listState.canScrollBackward && state.value.listState.canScrollForward
+        }
+    }
+    val firstVisibleItemIndex = remember {
+        derivedStateOf {
+            state.value.listState.firstVisibleItemIndex
+        }
+    }
+    val firstVisibleItemOffset = remember {
+        derivedStateOf {
+            state.value.listState.firstVisibleItemScrollOffset
+        }
+    }
+
     LaunchedEffect(Unit) {
         viewModel.init(
             navigator,
@@ -102,17 +113,37 @@ fun ReaderScreenRoot() {
                 libraryViewModel.onEvent(LibraryEvent.OnUpdateBook(it))
                 historyViewModel.onEvent(HistoryEvent.OnLoadList)
             },
-            listState = listState,
+            onError = {
+                Toast.makeText(
+                    context,
+                    it.asString(context),
+                    Toast.LENGTH_LONG
+                ).show()
+            },
             onLoaded = {
                 loading.value = false
             }
         )
     }
+    LaunchedEffect(canScroll) {
+        if (!canScroll && !state.value.showMenu && !loading.value) {
+            viewModel.onEvent(ReaderEvent.OnShowHideMenu(context = context))
+        }
+    }
+    LaunchedEffect(firstVisibleItemIndex.value, firstVisibleItemOffset.value) {
+        viewModel.onUpdateProgress(
+            firstVisibleItemIndex = firstVisibleItemIndex.value,
+            firstVisibleItemOffset = firstVisibleItemOffset.value,
+            navigator = navigator,
+            isReaderLoading = loading.value,
+            onLibraryEvent = libraryViewModel::onEvent,
+            onHistoryEvent = historyViewModel::onEvent
+        )
+    }
 
     ReaderScreen(
         state = state,
         mainState = mainState,
-        listState = listState,
         loading = loading,
         navigator = navigator,
         onEvent = viewModel::onEvent,
@@ -122,13 +153,11 @@ fun ReaderScreenRoot() {
     )
 }
 
-@OptIn(FlowPreview::class)
 @SuppressLint("UnusedMaterial3ScaffoldPaddingParameter")
 @Composable
 private fun ReaderScreen(
     state: State<ReaderState>,
     mainState: State<MainState>,
-    listState: LazyListState,
     loading: State<Boolean>,
     navigator: Navigator,
     onEvent: (ReaderEvent) -> Unit,
@@ -137,13 +166,9 @@ private fun ReaderScreen(
     onHistoryEvent: (HistoryEvent) -> Unit,
 ) {
     val context = LocalContext.current as ComponentActivity
-    val systemBarsColor = MaterialTheme.colorScheme.surfaceContainerHighest.copy(0.85f)
+    val density = LocalDensity.current
+    val systemBarsColor = MaterialTheme.colorScheme.surfaceContainerHighest.copy(0.94f)
 
-    val canScroll by remember {
-        derivedStateOf {
-            listState.canScrollBackward && listState.canScrollForward
-        }
-    }
     val nestedScrollConnection = remember(state) {
         object : NestedScrollConnection {
             override fun onPostScroll(
@@ -162,6 +187,9 @@ private fun ReaderScreen(
         }
     }
 
+    val text = remember(state.value.text) {
+        state.value.text.toList().sortedBy { it.first }
+    }
     val fontFamily = remember(mainState.value.fontFamily) {
         Constants.FONTS.find {
             it.id == mainState.value.fontFamily
@@ -190,46 +218,45 @@ private fun ReaderScreen(
         }
     }
 
-
+    if (state.value.showTranslatorBottomSheet) {
-    LaunchedEffect(canScroll) {
+        ReaderTranslatorBottomSheet(
-        if (!canScroll && !state.value.showMenu && !loading.value) {
+            state = state,
-            onEvent(ReaderEvent.OnShowHideMenu(context = context))
+            onEvent = onEvent
-        }
+        )
     }
+    if (state.value.showLanguageBottomSheet) {
+        TranslatorLanguageBottomSheet(
+            selectedLanguage = if (state.value.languageBottomSheetTranslateFrom) {
+                state.value.book.translateFrom
+            } else state.value.book.translateTo,
 
-    LaunchedEffect(listState) {
+            unselectedLanguage = if (!state.value.languageBottomSheetTranslateFrom) {
-        snapshotFlow {
+                state.value.book.translateFrom
-            listState.firstVisibleItemIndex to listState.firstVisibleItemScrollOffset
+            } else state.value.book.translateTo,
-        }.debounce(500).collectLatest { items ->
-            if (!loading.value && state.value.text.isNotEmpty() && listState.layoutInfo.totalItemsCount > 0) {
-                val lastVisibleItemIndex = listState.layoutInfo.visibleItemsInfo.last().index
-
-                val progress = if (items.first > 0) {
-                    if (lastVisibleItemIndex >= (listState.layoutInfo.totalItemsCount - 1)) {
-                        1f
-                    } else {
-                        (items.first.toFloat() / (state.value.text.lastIndex).toFloat())
-                    }
-                } else {
-                    0f
-                }
 
+            translateFromSelecting = state.value.languageBottomSheetTranslateFrom,
+            onSelect = { from, to ->
                 onEvent(
-                    ReaderEvent.OnChangeProgress(
+                    ReaderEvent.OnChangeTranslatorSettings(
-                        progress = progress,
+                        translateFrom = from,
-                        navigator = navigator,
+                        translateTo = to
-                        firstVisibleItemIndex = items.first,
+                    )
-                        firstVisibleItemOffset = items.second,
+                )
-                        refreshList = { book ->
+                onEvent(
-                            onLibraryEvent(LibraryEvent.OnUpdateBook(book))
+                    ReaderEvent.OnShowHideLanguageBottomSheet(
-                            onHistoryEvent(HistoryEvent.OnUpdateBook(book))
+                        show = false
-                        }
+                    )
+                )
+            },
+            onDismiss = {
+                onEvent(
+                    ReaderEvent.OnShowHideLanguageBottomSheet(
+                        show = false
                     )
                 )
             }
-        }
+        )
     }
-
     if (state.value.showSettingsBottomSheet) {
         ReaderSettingsBottomSheet(
             mainState = mainState,
@@ -237,6 +264,12 @@ private fun ReaderScreen(
             onMainEvent = onMainEvent
         )
     }
+    if (state.value.showDownloadLanguageDialog) {
+        ReaderDownloadLanguageDialog(
+            state = state,
+            onEvent = onEvent
+        )
+    }
 
     Scaffold(
         Modifier
@@ -254,13 +287,13 @@ private fun ReaderScreen(
                     onEvent = onEvent,
                     onLibraryUpdateEvent = onLibraryEvent,
                     onHistoryUpdateEvent = onHistoryEvent,
-                    listState = listState,
                     containerColor = systemBarsColor
                 )
             }
         },
         bottomBar = {
             CustomAnimatedVisibility(
+                modifier = Modifier.fillMaxWidth(),
                 visible = state.value.showMenu,
                 enter = slideInVertically { it },
                 exit = slideOutVertically { it }
@@ -270,7 +303,6 @@ private fun ReaderScreen(
                     onEvent = onEvent,
                     onLibraryUpdateEvent = onLibraryEvent,
                     onHistoryUpdateEvent = onHistoryEvent,
-                    listState = listState,
                     containerColor = systemBarsColor
                 )
             }
@@ -288,7 +320,7 @@ private fun ReaderScreen(
             },
             onTranslateRequested = { textToTranslate ->
                 onEvent(
-                    ReaderEvent.OnTranslateText(
+                    ReaderEvent.OnOpenTranslator(
                         textToTranslate,
                         context,
                         noAppsFound = {
@@ -318,9 +350,10 @@ private fun ReaderScreen(
             }
         ) { toolbarShowed ->
             LazyColumn(
-                state = listState,
+                state = state.value.listState,
                 modifier = Modifier
                     .fillMaxSize()
+                    .background(backgroundColor)
                     .then(
                         if (!loading.value && toolbarShowed) {
                             Modifier
@@ -336,56 +369,49 @@ private fun ReaderScreen(
                         } else {
                             Modifier
                         }
-                    )
+                    ),
+                verticalArrangement = Arrangement.spacedBy(paragraphHeight)
             ) {
                 if (state.value.text.isNotEmpty()) {
                     item {
                         DisableSelection {
                             ReaderStartItem(state = state)
                         }
+
+                        Spacer(modifier = Modifier.height(18.dp))
                     }
                 }
 
-                customItemsIndexed(
+                customItems(
-                    state.value.text, key = { key -> key.id }
+                    text, key = { key -> key.first }
-                ) { index, line ->
+                ) { line ->
-                    val text = remember(mainState.value.paragraphIndentation, line) {
+                    ReaderTextParagraph(
-                        "${if (mainState.value.paragraphIndentation!!) "  " else ""}${line.line}"
+                        state = state,
-                    }
+                        id = line.first,
-
+                        line = line.second,
-                    Column(
+                        context = context,
-                        Modifier
+                        density = density,
-                            .background(backgroundColor)
+                        fontFamily = fontFamily,
-                            .fillMaxWidth()
+                        fontColor = fontColor,
-                            .padding(
+                        lineHeight = lineHeight,
-                                top = if (index == 0) 18.dp else 0.dp,
+                        fontStyle = fontStyle,
-                                start = sidePadding,
+                        fontSize = mainState.value.fontSize!!.sp,
-                                end = sidePadding,
+                        sidePadding = sidePadding,
-                                bottom = if (index == state.value.text.lastIndex) 18.dp
+                        paragraphIndentation = mainState.value.paragraphIndentation!!,
-                                else paragraphHeight
+                        onEvent = onEvent
-                            )
+                    )
-                    ) {
-                        Text(
-                            text = text,
-                            color = fontColor,
-                            style = TextStyle(lineBreak = LineBreak.Paragraph),
-                            fontFamily = fontFamily.font,
-                            fontStyle = fontStyle,
-                            fontSize = mainState.value.fontSize!!.sp,
-                            lineHeight = lineHeight
-                        )
-                    }
                 }
 
                 if (state.value.text.isNotEmpty()) {
                     item {
+                        Spacer(modifier = Modifier.height(18.dp))
+
                         DisableSelection {
                             ReaderEndItem(
                                 state = state,
                                 onEvent = onEvent,
                                 onLibraryEvent = onLibraryEvent,
                                 onHistoryUpdateEvent = onHistoryEvent,
-                                listState = listState
                             )
                         }
                     }
@@ -417,7 +443,6 @@ private fun ReaderScreen(
                                     onLibraryEvent(LibraryEvent.OnUpdateBook(it))
                                     onHistoryEvent(HistoryEvent.OnUpdateBook(it))
                                 },
-                                listState = listState,
                                 navigate = {
                                     it.navigateBack()
                                 }
@@ -452,7 +477,6 @@ private fun ReaderScreen(
                     onLibraryEvent(LibraryEvent.OnUpdateBook(it))
                     onHistoryEvent(HistoryEvent.OnUpdateBook(it))
                 },
-                listState = listState,
                 navigate = {
                     it.navigateBack()
                 }

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/ReaderEndItem.kt

@@ -9,11 +9,10 @@ import androidx.compose.foundation.layout.PaddingValues
 import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.WindowInsets
 import androidx.compose.foundation.layout.asPaddingValues
-import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.navigationBarsIgnoringVisibility
 import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
@@ -40,6 +39,11 @@ import ua.acclorite.book_story.presentation.screens.reader.data.ReaderState
 
 /**
  * Reader end item. Displays at the end of the book.
+ *
+ * @param state [ReaderState].
+ * @param onEvent [ReaderEvent] callback.
+ * @param onLibraryEvent [LibraryEvent] callback.
+ * @param onHistoryUpdateEvent [HistoryEvent] callback.
  */
 @OptIn(ExperimentalLayoutApi::class)
 @Composable
@@ -48,7 +52,6 @@ fun ReaderEndItem(
     onEvent: (ReaderEvent) -> Unit,
     onLibraryEvent: (LibraryEvent) -> Unit,
     onHistoryUpdateEvent: (HistoryEvent.OnUpdateBook) -> Unit,
-    listState: LazyListState,
 ) {
     val navigator = LocalNavigator.current
     val context = LocalContext.current as ComponentActivity
@@ -62,7 +65,7 @@ fun ReaderEndItem(
 
     Column(
         modifier = Modifier
-            .fillMaxWidth()
+            .fillMaxSize()
             .background(MaterialTheme.colorScheme.surface)
             .padding(
                 horizontal = 36.dp,
@@ -104,7 +107,6 @@ fun ReaderEndItem(
                                 onLibraryEvent(LibraryEvent.OnUpdateCurrentPage(it))
                             },
                             navigator = navigator,
-                            listState = listState,
                             context = context
                         )
                     )
@@ -123,7 +125,6 @@ fun ReaderEndItem(
                                 onLibraryEvent(LibraryEvent.OnUpdateBook(it))
                                 onHistoryUpdateEvent(HistoryEvent.OnUpdateBook(it))
                             },
-                            listState = listState,
                             navigate = {
                                 it.navigate(Screen.LIBRARY, true)
                             }

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/app_bar/ReaderBottomBar.kt

@@ -9,7 +9,6 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.navigationBarsPadding
 import androidx.compose.foundation.layout.padding
-import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Slider
 import androidx.compose.material3.SliderDefaults
@@ -33,6 +32,12 @@ import ua.acclorite.book_story.presentation.screens.reader.data.ReaderState
 
 /**
  * Reader bottom bar. Has a slider to change progress.
+ *
+ * @param state [ReaderState].
+ * @param onEvent [ReaderEvent] callback.
+ * @param onLibraryUpdateEvent [LibraryEvent] callback.
+ * @param onHistoryUpdateEvent [HistoryEvent] callback.
+ * @param containerColor Container color.
  */
 @Composable
 fun ReaderBottomBar(
@@ -40,7 +45,6 @@ fun ReaderBottomBar(
     onEvent: (ReaderEvent) -> Unit,
     onLibraryUpdateEvent: (LibraryEvent.OnUpdateBook) -> Unit,
     onHistoryUpdateEvent: (HistoryEvent.OnUpdateBook) -> Unit,
-    listState: LazyListState,
     containerColor: Color
 ) {
     val navigator = LocalNavigator.current
@@ -79,13 +83,13 @@ fun ReaderBottomBar(
             value = state.value.book.progress,
             enabled = !state.value.lockMenu,
             onValueChange = {
-                if (listState.layoutInfo.totalItemsCount > 0) {
+                if (state.value.listState.layoutInfo.totalItemsCount > 0) {
-                    onEvent(ReaderEvent.OnScroll(listState, it))
+                    onEvent(ReaderEvent.OnScroll(it))
                     onEvent(
                         ReaderEvent.OnChangeProgress(
                             progress = it,
                             navigator = navigator,
-                            firstVisibleItemIndex = listState.firstVisibleItemIndex,
+                            firstVisibleItemIndex = state.value.listState.firstVisibleItemIndex,
                             firstVisibleItemOffset = 0,
                             refreshList = { book ->
                                 onLibraryUpdateEvent(LibraryEvent.OnUpdateBook(book))

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/app_bar/ReaderTopBar.kt

@@ -5,11 +5,12 @@ import androidx.compose.foundation.basicMarquee
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Column
-import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.ArrowBack
 import androidx.compose.material.icons.filled.Settings
+import androidx.compose.material.icons.filled.Translate
 import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.LocalContentColor
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
 import androidx.compose.material3.TopAppBar
@@ -39,6 +40,12 @@ import ua.acclorite.book_story.presentation.screens.reader.data.ReaderState
 
 /**
  * Reader top bar. Displays title of the book.
+ *
+ * @param state [ReaderState].
+ * @param onEvent [ReaderEvent] callback.
+ * @param onLibraryUpdateEvent [LibraryEvent] callback.
+ * @param onHistoryUpdateEvent [HistoryEvent] callback.
+ * @param containerColor Container color.
  */
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -47,7 +54,6 @@ fun ReaderTopBar(
     onEvent: (ReaderEvent) -> Unit,
     onLibraryUpdateEvent: (LibraryEvent.OnUpdateBook) -> Unit,
     onHistoryUpdateEvent: (HistoryEvent.OnUpdateBook) -> Unit,
-    listState: LazyListState,
     containerColor: Color
 ) {
     val navigator = LocalNavigator.current
@@ -78,7 +84,6 @@ fun ReaderTopBar(
                             onLibraryUpdateEvent(LibraryEvent.OnUpdateBook(it))
                             onHistoryUpdateEvent(HistoryEvent.OnUpdateBook(it))
                         },
-                        listState = listState,
                         navigate = {
                             it.navigateBack()
                         }
@@ -93,6 +98,7 @@ fun ReaderTopBar(
                     fontFamily = FontFamily.Default,
                     fontWeight = FontWeight.Normal,
                     fontSize = 20.sp,
+                    lineHeight = 20.sp,
                     color = MaterialTheme.colorScheme.onSurface,
                     maxLines = 1,
                     modifier = Modifier
@@ -109,7 +115,6 @@ fun ReaderTopBar(
                                             onLibraryUpdateEvent(LibraryEvent.OnUpdateBook(it))
                                             onHistoryUpdateEvent(HistoryEvent.OnUpdateBook(it))
                                         },
-                                        listState = listState,
                                         navigate = {
                                             it.navigateWithoutBackStack(
                                                 Screen.BOOK_INFO,
@@ -121,7 +126,7 @@ fun ReaderTopBar(
                             }
                         )
                         .basicMarquee(
-                            delayMillis = 4000
+                            iterations = Int.MAX_VALUE
                         )
                 )
                 Text(
@@ -135,6 +140,17 @@ fun ReaderTopBar(
             }
         },
         actions = {
+            CustomIconButton(
+                icon = Icons.Default.Translate,
+                contentDescription = R.string.translator_content_desc,
+                disableOnClick = false,
+                enabled = !state.value.lockMenu,
+                color = if (state.value.book.enableTranslator) {
+                    MaterialTheme.colorScheme.primary
+                } else LocalContentColor.current
+            ) {
+                onEvent(ReaderEvent.OnShowHideTranslatorBottomSheet())
+            }
             CustomIconButton(
                 icon = Icons.Default.Settings,
                 contentDescription = R.string.open_reader_settings_content_desc,

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/download_language_dialog/ReaderDownloadLanguageDialog.kt

@@ -0,0 +1,116 @@
+package ua.acclorite.book_story.presentation.screens.reader.components.download_language_dialog
+
+import android.widget.Toast
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Download
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.presentation.components.customItems
+import ua.acclorite.book_story.presentation.components.custom_dialog.CustomDialogWithLazyColumn
+import ua.acclorite.book_story.presentation.screens.reader.data.ReaderEvent
+import ua.acclorite.book_story.presentation.screens.reader.data.ReaderState
+
+/**
+ * Reader Download Language Dialog. Downloads multiple language models at the same time.
+ *
+ * @param state [ReaderState].
+ * @param onEvent [ReaderEvent] callback.
+ */
+@Composable
+fun ReaderDownloadLanguageDialog(
+    state: State<ReaderState>,
+    onEvent: (ReaderEvent) -> Unit
+) {
+    val context = LocalContext.current
+    var isOnClickEnabled by remember { mutableStateOf(true) }
+    val isDownloading by remember {
+        derivedStateOf {
+            state.value.languagesToTranslate.any { it.isDownloading }
+        }
+    }
+    val isDownloaded by remember {
+        derivedStateOf {
+            state.value.languagesToTranslate.filter { it.isSelected }.none { !it.isDownloaded }
+        }
+    }
+    val languages = remember(state.value.languagesToTranslate, isDownloading) {
+        if (isDownloading) {
+            state.value.languagesToTranslate.sortedByDescending { it.isDownloading }
+        } else {
+            state.value.languagesToTranslate
+        }
+    }
+
+    CustomDialogWithLazyColumn(
+        title = stringResource(id = R.string.download_languages),
+        imageVectorIcon = Icons.Default.Download,
+        description = stringResource(
+            id = R.string.download_languages_description
+        ),
+        actionText = stringResource(
+            if (!isDownloaded) R.string.download
+            else R.string.continue_download
+        ),
+        disableOnClick = false,
+        isActionEnabled = isOnClickEnabled,
+        onDismiss = { onEvent(ReaderEvent.OnDismissDownloadLanguageDialog) },
+        onAction = {
+            isOnClickEnabled = false
+            onEvent(
+                ReaderEvent.OnDownloadLanguages(
+                    onSuccess = {
+                        Toast.makeText(
+                            context,
+                            context.getString(R.string.languages_downloaded),
+                            Toast.LENGTH_LONG
+                        ).show()
+
+                        onEvent(
+                            ReaderEvent.OnTranslateText(
+                                it.keys,
+                                error = { error ->
+                                    Toast.makeText(
+                                        context,
+                                        error.asString(context),
+                                        Toast.LENGTH_LONG
+                                    ).show()
+                                }
+                            )
+                        )
+                    },
+                    error = {
+                        Toast.makeText(
+                            context,
+                            it.asString(context),
+                            Toast.LENGTH_LONG
+                        ).show()
+                    }
+                )
+            )
+        },
+        withDivider = true,
+        items = {
+            customItems(
+                languages, key = { it.languageCode }
+            ) {
+                ReaderDownloadLanguageDialogItem(
+                    language = it,
+                    isEnabled = !isDownloading,
+                    onClick = {
+                        onEvent(
+                            ReaderEvent.OnSelectLanguage(it)
+                        )
+                    }
+                )
+            }
+        }
+    )
+}

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/download_language_dialog/ReaderDownloadLanguageDialogItem.kt

@@ -0,0 +1,177 @@
+package ua.acclorite.book_story.presentation.screens.reader.components.download_language_dialog
+
+import android.widget.Toast
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.lazy.LazyItemScope
+import androidx.compose.foundation.shape.CircleShape
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.DownloadDone
+import androidx.compose.material.icons.filled.Error
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.Icon
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.domain.model.SelectableLanguage
+import ua.acclorite.book_story.presentation.components.CustomCheckbox
+import ua.acclorite.book_story.presentation.ui.DefaultTransition
+
+/**
+ * Reader Download Language Dialog Item.
+ *
+ * @param language [SelectableLanguage] item.
+ * @param isEnabled Whether OnClick is enabled or not.
+ * @param onClick OnClick callback.
+ */
+@Composable
+fun LazyItemScope.ReaderDownloadLanguageDialogItem(
+    language: SelectableLanguage,
+    isEnabled: Boolean = true,
+    onClick: () -> Unit
+) {
+    val context = LocalContext.current
+
+    if (
+        isEnabled || language.isDownloading || language.isDownloaded || language.isError
+    ) {
+        Row(
+            modifier = Modifier
+                .animateItem(
+                    fadeInSpec = null,
+                    fadeOutSpec = null
+                )
+                .fillMaxWidth()
+                .clickable(
+                    enabled = !language.isDownloading &&
+                            !language.isDownloaded &&
+                            language.canUnselect &&
+                            isEnabled || language.isError
+                ) {
+                    if (!language.isError) {
+                        onClick()
+                    } else if (language.errorMessage != null) {
+                        Toast
+                            .makeText(
+                                context,
+                                language.errorMessage.asString(context),
+                                Toast.LENGTH_LONG
+                            )
+                            .show()
+                    }
+                }
+                .padding(vertical = 12.dp, horizontal = 24.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            Column(Modifier.weight(1f)) {
+                Text(
+                    text = language.displayLanguage,
+                    color = MaterialTheme.colorScheme.onSurface,
+                    style = MaterialTheme.typography.bodyLarge,
+                    maxLines = 1,
+                    overflow = TextOverflow.Ellipsis
+                )
+                if (!language.occurrences.isNullOrEmpty()) {
+                    Text(
+                        text = stringResource(
+                            id = R.string.translator_occurrences,
+                            language.occurrences.size
+                        ),
+                        style = MaterialTheme.typography.bodySmall,
+                        color = MaterialTheme.colorScheme.onSurfaceVariant,
+                        maxLines = 1,
+                        overflow = TextOverflow.Ellipsis
+                    )
+                }
+            }
+
+
+            Box(contentAlignment = Alignment.CenterEnd) {
+                DefaultTransition(
+                    language.isDownloading && !language.isDownloaded && !language.isError
+                ) {
+                    Row {
+                        Spacer(modifier = Modifier.width(24.dp))
+                        CircularProgressIndicator(
+                            strokeWidth = 2.5.dp,
+                            modifier = Modifier
+                                .size(22.dp),
+                            color = MaterialTheme.colorScheme.onSurfaceVariant
+                        )
+                        Spacer(modifier = Modifier.width(4.dp))
+                    }
+                }
+
+
+                DefaultTransition(
+                    language.isDownloaded && !language.isDownloading && !language.isError
+                ) {
+                    Row {
+                        Spacer(modifier = Modifier.width(24.dp))
+                        Icon(
+                            imageVector = Icons.Default.DownloadDone,
+                            tint = MaterialTheme.colorScheme.onSurfaceVariant,
+                            modifier = Modifier
+                                .clip(CircleShape)
+                                .background(
+                                    MaterialTheme.colorScheme.outlineVariant,
+                                    shape = CircleShape
+                                )
+                                .padding(6.dp)
+                                .size(17.dp),
+                            contentDescription = stringResource(id = R.string.downloaded_content_desc)
+                        )
+                    }
+                }
+
+                DefaultTransition(
+                    !language.isDownloaded && !language.isDownloading && isEnabled && !language.isError
+                ) {
+                    Row {
+                        Spacer(modifier = Modifier.width(24.dp))
+                        CustomCheckbox(
+                            selected = language.isSelected,
+                            size = 20.dp,
+                            containerColor =
+                            if (language.canUnselect) MaterialTheme.colorScheme.surfaceContainerHigh
+                            else MaterialTheme.colorScheme.surfaceContainerHigh
+                        )
+                    }
+                }
+
+                DefaultTransition(
+                    !language.isDownloaded && !language.isDownloading && language.isError
+                ) {
+                    Row {
+                        Spacer(modifier = Modifier.width(24.dp))
+                        Icon(
+                            imageVector = Icons.Default.Error,
+                            tint = MaterialTheme.colorScheme.error,
+                            modifier = Modifier
+                                .size(27.dp),
+                            contentDescription = stringResource(id = R.string.error_content_desc)
+                        )
+                        Spacer(modifier = Modifier.width(1.5.dp))
+                    }
+                }
+            }
+        }
+    }
+
+}

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/settings_bottom_sheet/ReaderSettingsBottomSheet.kt

@@ -4,30 +4,22 @@ import androidx.activity.ComponentActivity
 import androidx.compose.animation.animateColorAsState
 import androidx.compose.animation.core.animateFloatAsState
 import androidx.compose.animation.core.tween
-import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Spacer
-import androidx.compose.foundation.layout.WindowInsets
-import androidx.compose.foundation.layout.asPaddingValues
 import androidx.compose.foundation.layout.fillMaxHeight
-import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
-import androidx.compose.foundation.layout.navigationBars
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.foundation.pager.HorizontalPager
 import androidx.compose.foundation.pager.rememberPagerState
 import androidx.compose.material3.BottomSheetDefaults
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.MaterialTheme
-import androidx.compose.material3.ModalBottomSheet
-import androidx.compose.material3.rememberModalBottomSheetState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.State
 import androidx.compose.runtime.derivedStateOf
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
-import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.platform.LocalContext
@@ -38,6 +30,7 @@ import ua.acclorite.book_story.R
 import ua.acclorite.book_story.domain.model.ButtonItem
 import ua.acclorite.book_story.domain.util.Constants
 import ua.acclorite.book_story.presentation.components.CategoryTitle
+import ua.acclorite.book_story.presentation.components.CustomBottomSheet
 import ua.acclorite.book_story.presentation.data.MainEvent
 import ua.acclorite.book_story.presentation.data.MainState
 import ua.acclorite.book_story.presentation.screens.reader.data.ReaderEvent
@@ -48,10 +41,12 @@ import ua.acclorite.book_story.presentation.screens.settings.components.SwitchWi
 
 /**
  * Settings bottom sheet. Has General and Colors categories.
+ *
+ * @param mainState [MainState].
+ * @param onEvent [ReaderEvent] callback.
+ * @param onMainEvent [MainEvent] callback.
  */
-@OptIn(
+@OptIn(ExperimentalMaterial3Api::class)
-    ExperimentalMaterial3Api::class
-)
 @Composable
 fun ReaderSettingsBottomSheet(
     mainState: State<MainState>,
@@ -62,9 +57,6 @@ fun ReaderSettingsBottomSheet(
     val currentPage by remember { derivedStateOf { pagerState.currentPage } }
     val context = LocalContext.current
 
-    val navigationBarPadding =
-        WindowInsets.navigationBars.asPaddingValues().calculateBottomPadding()
-
     val fontFamily = remember(mainState.value.fontFamily) {
         Constants.FONTS.find {
             it.id == mainState.value.fontFamily
@@ -98,210 +90,205 @@ fun ReaderSettingsBottomSheet(
         )
     }
 
-    Box(modifier = Modifier.fillMaxSize()) {
+    CustomBottomSheet(
-        ModalBottomSheet(
+        hasFixedHeight = true,
-            scrimColor = animatedScrimColor,
+        scrimColor = animatedScrimColor,
-            dragHandle = {},
+        modifier = Modifier
-            modifier = Modifier
+            .fillMaxWidth()
-                .align(Alignment.BottomCenter)
+            .fillMaxHeight(animatedHeight),
-                .fillMaxWidth()
+        dragHandle = {},
-                .fillMaxHeight(animatedHeight),
+        onDismissRequest = {
-            onDismissRequest = {
+            onEvent(ReaderEvent.OnShowHideSettingsBottomSheet)
-                onEvent(ReaderEvent.OnShowHideSettingsBottomSheet)
+        }
-            },
+    ) {
-            sheetState = rememberModalBottomSheetState(true),
+        ReaderSettingsBottomSheetTabRow(
-            contentWindowInsets = { WindowInsets(0, 0, 0, 0) },
+            onEvent = onEvent,
-            containerColor = MaterialTheme.colorScheme.surfaceContainerLow
+            pagerState = pagerState
-        ) {
+        )
-            ReaderSettingsBottomSheetTabRow(
-                onEvent = onEvent,
-                pagerState = pagerState
-            )
-
-            HorizontalPager(state = pagerState) { page ->
-                LazyColumn {
-                    if (page == 0) {
-                        item {
-                            Spacer(modifier = Modifier.height(22.dp))
-                        }
-                        item {
-                            CategoryTitle(
-                                title = stringResource(id = R.string.font_reader_settings),
-                                color = MaterialTheme.colorScheme.onSurface
-                            )
-                        }
-                        item {
-                            Spacer(modifier = Modifier.height(8.dp))
-                        }
-                        item {
-                            ChipsWithTitle(
-                                title = stringResource(id = R.string.font_family_option),
-                                chips = Constants.FONTS
-                                    .map {
-                                        ButtonItem(
-                                            it.id,
-                                            it.fontName.asString(),
-                                            MaterialTheme.typography.labelLarge.copy(
-                                                fontFamily = it.font
-                                            ),
-                                            it.id == fontFamily.id
-                                        )
-                                    },
-                                onClick = {
-                                    onMainEvent(MainEvent.OnChangeFontFamily(it.id))
-                                }
-                            )
-                        }
-                        item {
-                            ChipsWithTitle(
-                                title = stringResource(id = R.string.font_style_option),
-                                chips = listOf(
-                                    ButtonItem(
-                                        "normal",
-                                        stringResource(id = R.string.font_style_normal),
-                                        MaterialTheme.typography.labelLarge.copy(
-                                            fontFamily = fontFamily.font,
-                                            fontStyle = FontStyle.Normal
-                                        ),
-                                        !mainState.value.isItalic!!
-                                    ),
-                                    ButtonItem(
-                                        "italic",
-                                        stringResource(id = R.string.font_style_italic),
-                                        MaterialTheme.typography.labelLarge.copy(
-                                            fontFamily = fontFamily.font,
-                                            fontStyle = FontStyle.Italic
-                                        ),
-                                        mainState.value.isItalic!!
-                                    ),
-                                ),
-                                onClick = {
-                                    onMainEvent(
-                                        MainEvent.OnChangeFontStyle(
-                                            when (it.id) {
-                                                "italic" -> true
-                                                else -> false
-                                            }
-                                        )
-                                    )
-                                }
-                            )
-                        }
-                        item {
-                            SliderWithTitle(
-                                value = mainState.value.fontSize!! to "pt",
-                                fromValue = 10,
-                                toValue = 35,
-                                title = stringResource(id = R.string.font_size_option),
-                                onValueChange = {
-                                    onMainEvent(
-                                        MainEvent.OnChangeFontSize(it)
-                                    )
-                                }
-                            )
-                        }
-                        item {
-                            Spacer(modifier = Modifier.height(22.dp))
-                        }
-                        item {
-                            CategoryTitle(
-                                title = stringResource(id = R.string.text_reader_settings),
-                                color = MaterialTheme.colorScheme.onSurface
-                            )
-                        }
-                        item {
-                            Spacer(modifier = Modifier.height(8.dp))
-                        }
-                        item {
-                            SliderWithTitle(
-                                value = mainState.value.sidePadding!! to "pt",
-                                fromValue = 1,
-                                toValue = 20,
-                                title = stringResource(id = R.string.side_padding_option),
-                                onValueChange = {
-                                    onMainEvent(
-                                        MainEvent.OnChangeSidePadding(it)
-                                    )
-                                }
-                            )
-                        }
-                        item {
-                            SliderWithTitle(
-                                value = mainState.value.lineHeight!! to "pt",
-                                fromValue = 1,
-                                toValue = 16,
-                                title = stringResource(id = R.string.line_height_option),
-                                onValueChange = {
-                                    onMainEvent(
-                                        MainEvent.OnChangeLineHeight(it)
-                                    )
-                                }
-                            )
-                        }
-                        item {
-                            SliderWithTitle(
-                                value = mainState.value.paragraphHeight!! to "pt",
-                                fromValue = 0,
-                                toValue = 24,
-                                title = stringResource(id = R.string.paragraph_height_option),
-                                onValueChange = {
-                                    onMainEvent(
-                                        MainEvent.OnChangeParagraphHeight(it)
-                                    )
-                                }
-                            )
-                        }
-                        item {
-                            SwitchWithTitle(
-                                selected = mainState.value.paragraphIndentation!!,
-                                title = stringResource(id = R.string.paragraph_indentation_option)
-                            ) {
-                                onMainEvent(
-                                    MainEvent.OnChangeParagraphIndentation(!mainState.value.paragraphIndentation!!)
-                                )
-                            }
-                        }
-                    }
-
-                    if (page == 1) {
-                        item {
-                            Spacer(modifier = Modifier.height(14.dp))
-                        }
-                        item {
-                            ColorPickerWithTitle(
-                                value = Color(mainState.value.backgroundColor!!.toULong()),
-                                title = stringResource(id = R.string.background_color_option),
-                                onValueChange = {
-                                    onMainEvent(
-                                        MainEvent.OnChangeBackgroundColor(
-                                            it.value.toLong()
-                                        )
-                                    )
-                                }
-                            )
-                        }
-                        item {
-                            ColorPickerWithTitle(
-                                value = Color(mainState.value.fontColor!!.toULong()),
-                                title = stringResource(id = R.string.font_color_option),
-                                onValueChange = {
-                                    onMainEvent(
-                                        MainEvent.OnChangeFontColor(
-                                            it.value.toLong()
-                                        )
-                                    )
-                                }
-                            )
-                        }
-                    }
 
+        HorizontalPager(state = pagerState) { page ->
+            LazyColumn {
+                if (page == 0) {
                     item {
-                        Spacer(
+                        Spacer(modifier = Modifier.height(22.dp))
-                            modifier = Modifier.height(
+                    }
-                                8.dp + navigationBarPadding
+                    item {
-                            )
+                        CategoryTitle(
+                            title = stringResource(id = R.string.font_reader_settings),
+                            color = MaterialTheme.colorScheme.onSurface
                         )
                     }
+                    item {
+                        Spacer(modifier = Modifier.height(8.dp))
+                    }
+                    item {
+                        ChipsWithTitle(
+                            title = stringResource(id = R.string.font_family_option),
+                            chips = Constants.FONTS
+                                .map {
+                                    ButtonItem(
+                                        it.id,
+                                        it.fontName.asString(),
+                                        MaterialTheme.typography.labelLarge.copy(
+                                            fontFamily = it.font
+                                        ),
+                                        it.id == fontFamily.id
+                                    )
+                                },
+                            onClick = {
+                                onMainEvent(MainEvent.OnChangeFontFamily(it.id))
+                            }
+                        )
+                    }
+                    item {
+                        ChipsWithTitle(
+                            title = stringResource(id = R.string.font_style_option),
+                            chips = listOf(
+                                ButtonItem(
+                                    "normal",
+                                    stringResource(id = R.string.font_style_normal),
+                                    MaterialTheme.typography.labelLarge.copy(
+                                        fontFamily = fontFamily.font,
+                                        fontStyle = FontStyle.Normal
+                                    ),
+                                    !mainState.value.isItalic!!
+                                ),
+                                ButtonItem(
+                                    "italic",
+                                    stringResource(id = R.string.font_style_italic),
+                                    MaterialTheme.typography.labelLarge.copy(
+                                        fontFamily = fontFamily.font,
+                                        fontStyle = FontStyle.Italic
+                                    ),
+                                    mainState.value.isItalic!!
+                                ),
+                            ),
+                            onClick = {
+                                onMainEvent(
+                                    MainEvent.OnChangeFontStyle(
+                                        when (it.id) {
+                                            "italic" -> true
+                                            else -> false
+                                        }
+                                    )
+                                )
+                            }
+                        )
+                    }
+                    item {
+                        SliderWithTitle(
+                            value = mainState.value.fontSize!! to "pt",
+                            fromValue = 10,
+                            toValue = 35,
+                            title = stringResource(id = R.string.font_size_option),
+                            onValueChange = {
+                                onMainEvent(
+                                    MainEvent.OnChangeFontSize(it)
+                                )
+                            }
+                        )
+                    }
+                    item {
+                        Spacer(modifier = Modifier.height(22.dp))
+                    }
+                    item {
+                        CategoryTitle(
+                            title = stringResource(id = R.string.text_reader_settings),
+                            color = MaterialTheme.colorScheme.onSurface
+                        )
+                    }
+                    item {
+                        Spacer(modifier = Modifier.height(8.dp))
+                    }
+                    item {
+                        SliderWithTitle(
+                            value = mainState.value.sidePadding!! to "pt",
+                            fromValue = 1,
+                            toValue = 20,
+                            title = stringResource(id = R.string.side_padding_option),
+                            onValueChange = {
+                                onMainEvent(
+                                    MainEvent.OnChangeSidePadding(it)
+                                )
+                            }
+                        )
+                    }
+                    item {
+                        SliderWithTitle(
+                            value = mainState.value.lineHeight!! to "pt",
+                            fromValue = 1,
+                            toValue = 16,
+                            title = stringResource(id = R.string.line_height_option),
+                            onValueChange = {
+                                onMainEvent(
+                                    MainEvent.OnChangeLineHeight(it)
+                                )
+                            }
+                        )
+                    }
+                    item {
+                        SliderWithTitle(
+                            value = mainState.value.paragraphHeight!! to "pt",
+                            fromValue = 0,
+                            toValue = 24,
+                            title = stringResource(id = R.string.paragraph_height_option),
+                            onValueChange = {
+                                onMainEvent(
+                                    MainEvent.OnChangeParagraphHeight(it)
+                                )
+                            }
+                        )
+                    }
+                    item {
+                        SwitchWithTitle(
+                            selected = mainState.value.paragraphIndentation!!,
+                            title = stringResource(id = R.string.paragraph_indentation_option)
+                        ) {
+                            onMainEvent(
+                                MainEvent.OnChangeParagraphIndentation(!mainState.value.paragraphIndentation!!)
+                            )
+                        }
+                    }
+                }
+
+                if (page == 1) {
+                    item {
+                        Spacer(modifier = Modifier.height(14.dp))
+                    }
+                    item {
+                        ColorPickerWithTitle(
+                            value = Color(mainState.value.backgroundColor!!.toULong()),
+                            title = stringResource(id = R.string.background_color_option),
+                            onValueChange = {
+                                onMainEvent(
+                                    MainEvent.OnChangeBackgroundColor(
+                                        it.value.toLong()
+                                    )
+                                )
+                            }
+                        )
+                    }
+                    item {
+                        ColorPickerWithTitle(
+                            value = Color(mainState.value.fontColor!!.toULong()),
+                            title = stringResource(id = R.string.font_color_option),
+                            onValueChange = {
+                                onMainEvent(
+                                    MainEvent.OnChangeFontColor(
+                                        it.value.toLong()
+                                    )
+                                )
+                            }
+                        )
+                    }
+                }
+
+                item {
+                    Spacer(
+                        modifier = Modifier.height(
+                            8.dp + it
+                        )
+                    )
                 }
             }
         }

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/start_item/ReaderStartItem.kt

@@ -37,6 +37,8 @@ import ua.acclorite.book_story.presentation.screens.reader.data.ReaderState
 
 /**
  * Reader start item. Displays at the beginning of the book.
+ *
+ * @param state [ReaderState].
  */
 @OptIn(ExperimentalLayoutApi::class)
 @Composable
@@ -76,8 +78,10 @@ fun ReaderStartItem(state: State<ReaderState>) {
                     modifier = Modifier
                         .height(150.dp)
                         .width(100.dp)
-                        .clip(RoundedCornerShape(10.dp))
+                        .background(
-                        .background(MaterialTheme.colorScheme.surfaceContainerLow)
+                            MaterialTheme.colorScheme.surfaceContainerLow,
+                            RoundedCornerShape(10.dp)
+                        )
                 ) {
                     if (state.value.book.coverImage != null) {
                         CustomCoverImage(

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/text/ReaderTextParagraph.kt

@@ -0,0 +1,224 @@
+package ua.acclorite.book_story.presentation.screens.reader.components.text
+
+import android.content.Context
+import android.widget.Toast
+import androidx.activity.ComponentActivity
+import androidx.compose.animation.core.tween
+import androidx.compose.animation.expandVertically
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.shrinkVertically
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.lazy.LazyItemScope
+import androidx.compose.foundation.text.BasicText
+import androidx.compose.foundation.text.appendInlineContent
+import androidx.compose.foundation.text.selection.DisableSelection
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.TextStyle
+import androidx.compose.ui.text.buildAnnotatedString
+import androidx.compose.ui.text.font.FontStyle
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.text.style.LineBreak
+import androidx.compose.ui.unit.Density
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.TextUnit
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.domain.model.FontWithName
+import ua.acclorite.book_story.domain.model.LineWithTranslation
+import ua.acclorite.book_story.domain.util.ID
+import ua.acclorite.book_story.presentation.components.CustomAnimatedVisibility
+import ua.acclorite.book_story.presentation.screens.reader.data.ReaderEvent
+import ua.acclorite.book_story.presentation.screens.reader.data.ReaderState
+import java.util.Locale
+
+/**
+ * Reader Text Paragraph item.
+ *
+ * @param state [ReaderState].
+ * @param id Current paragraph [ID].
+ * @param line Current line.
+ * @param context Context.
+ * @param density [Density] from LocalDensity.current.
+ * @param fontFamily Line's font family.
+ * @param fontColor Line's font color.
+ * @param lineHeight Line's line height.
+ * @param fontStyle Line's font style.
+ * @param fontSize Line's font size.
+ * @param sidePadding Line's side padding.
+ * @param paragraphIndentation Whether Paragraph Indentation is enabled for this line.
+ * @param onEvent [ReaderEvent] callback.
+ */
+@OptIn(ExperimentalFoundationApi::class)
+@Composable
+fun LazyItemScope.ReaderTextParagraph(
+    state: State<ReaderState>,
+    id: ID,
+    line: LineWithTranslation,
+    context: Context,
+    density: Density,
+    fontFamily: FontWithName,
+    fontColor: Color,
+    lineHeight: TextUnit,
+    fontStyle: FontStyle,
+    fontSize: TextUnit,
+    sidePadding: Dp,
+    paragraphIndentation: Boolean,
+    onEvent: (ReaderEvent) -> Unit
+) {
+    val text = remember(
+        paragraphIndentation,
+        line.originalLine,
+        line.translatedLine,
+        line.useTranslation,
+        line.translatingTo,
+        line.translatingFrom
+    ) {
+        derivedStateOf {
+            if (paragraphIndentation) "  "
+            else "" +
+                    if (line.useTranslation && line.translatedLine != null) line.translatedLine
+                    else line.originalLine
+        }
+    }
+
+    val translated = remember(line.useTranslation, line.translatedLine) {
+        line.useTranslation && line.translatedLine != null
+    }
+    val showTrailingContent = remember(
+        line.isTranslationLoading, line.isTranslationFailed
+    ) {
+        line.isTranslationLoading || line.isTranslationFailed
+    }
+
+    val translatingFrom = remember(line.translatingFrom) {
+        val locale = Locale(line.translatingFrom)
+        locale.getDisplayName(locale).replaceFirstChar { char ->
+            char.uppercase()
+        }
+    }
+    val translatingTo = remember(line.translatingTo) {
+        val locale = Locale(line.translatingTo)
+        locale.getDisplayName(locale).replaceFirstChar { char ->
+            char.uppercase()
+        }
+    }
+
+    Column(
+        modifier = Modifier
+            .animateItem(fadeInSpec = null, fadeOutSpec = null)
+            .fillMaxWidth()
+            .padding(
+                horizontal = sidePadding
+            ),
+        verticalArrangement = Arrangement.Center
+    ) {
+        CustomAnimatedVisibility(
+            modifier = Modifier.animateItem(
+                placementSpec = tween(10),
+                fadeInSpec = null,
+                fadeOutSpec = null
+            ),
+            visible = translated,
+            enter = fadeIn(tween(250)) + expandVertically(tween(250)),
+            exit = fadeOut(tween(250)) + shrinkVertically(tween(250)),
+        ) {
+            DisableSelection {
+                Text(
+                    text = stringResource(
+                        id = R.string.translator_show_original,
+                        translatingFrom,
+                        translatingTo
+                    ),
+                    color = fontColor,
+                    fontStyle = FontStyle.Italic,
+                    fontWeight = FontWeight.Light,
+                    style = MaterialTheme.typography.bodyMedium,
+                    modifier = Modifier.clickable(interactionSource = null, indication = null) {
+                        onEvent(ReaderEvent.OnUndoTranslation(id))
+                    }
+                )
+            }
+        }
+
+        BasicText(
+            text = buildAnnotatedString {
+                append(text.value)
+
+                if (showTrailingContent) {
+                    append(" ")
+                    appendInlineContent("translator")
+                }
+            },
+            modifier = Modifier
+                .then(
+                    if (
+                        state.value.book.enableTranslator &&
+                        state.value.book.doubleClickTranslation
+                    ) {
+                        Modifier.combinedClickable(
+                            interactionSource = null,
+                            indication = null,
+                            onDoubleClick = {
+                                if (line.isTranslationLoading) {
+                                    return@combinedClickable
+                                }
+
+                                if (translated) {
+                                    onEvent(ReaderEvent.OnUndoTranslation(id))
+                                } else {
+                                    onEvent(
+                                        ReaderEvent.OnTranslateText(setOf(id)) {
+                                            Toast
+                                                .makeText(
+                                                    context,
+                                                    it.asString(context),
+                                                    Toast.LENGTH_LONG
+                                                )
+                                                .show()
+                                        }
+                                    )
+                                }
+                            },
+                            onClick = {
+                                onEvent(
+                                    ReaderEvent.OnShowHideMenu(context = context as ComponentActivity)
+                                )
+                            }
+                        )
+                    } else {
+                        Modifier
+                    }
+                ),
+            inlineContent = readerTextTrailingContent(
+                line = line,
+                color = fontColor,
+                textSize = fontSize,
+                context = context,
+                density = density
+            ),
+            style = TextStyle(
+                fontFamily = fontFamily.font,
+                fontStyle = fontStyle,
+                fontSize = fontSize,
+                lineHeight = lineHeight,
+                color = fontColor,
+                lineBreak = LineBreak.Paragraph
+            )
+        )
+    }
+
+}

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/text/ReaderTextTrailingContent.kt

@@ -0,0 +1,97 @@
+package ua.acclorite.book_story.presentation.screens.reader.components.text
+
+import android.content.Context
+import android.widget.Toast
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.text.InlineTextContent
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Error
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.Icon
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.Placeholder
+import androidx.compose.ui.text.PlaceholderVerticalAlign
+import androidx.compose.ui.unit.Density
+import androidx.compose.ui.unit.TextUnit
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.domain.model.LineWithTranslation
+import ua.acclorite.book_story.presentation.ui.DefaultTransition
+
+/**
+ * [ReaderTextParagraph]'s trailing content.
+ *
+ * @param line [ReaderTextParagraph]'s line.
+ * @param color Color.
+ * @param textSize Font size.
+ * @param context Context.
+ * @param density [Density] from LocalDensity.current.
+ */
+@Composable
+fun readerTextTrailingContent(
+    line: LineWithTranslation,
+    color: Color,
+    textSize: TextUnit,
+    context: Context,
+    density: Density
+): Map<String, InlineTextContent> {
+    val sizeDp = remember(textSize, density) { with(density) { textSize.toDp() } }
+    return remember(line.isTranslationLoading, line.isTranslationFailed, sizeDp, color, textSize) {
+        mapOf(
+            Pair(
+                "translator",
+                InlineTextContent(
+                    placeholder = Placeholder(
+                        width = textSize,
+                        height = textSize,
+                        placeholderVerticalAlign = PlaceholderVerticalAlign.Center
+                    ),
+                ) {
+                    Box(
+                        Modifier.fillMaxSize(),
+                        contentAlignment = Alignment.CenterEnd
+                    ) {
+                        DefaultTransition(line.isTranslationLoading) {
+                            CircularProgressIndicator(
+                                strokeWidth = sizeDp / 12,
+                                modifier = Modifier
+                                    .fillMaxSize(0.7f),
+                                color = color
+                            )
+                        }
+
+                        DefaultTransition(line.isTranslationFailed && !line.isTranslationLoading) {
+                            Icon(
+                                imageVector = Icons.Filled.Error,
+                                contentDescription = stringResource(id = R.string.error_content_desc),
+                                tint = color,
+                                modifier = Modifier
+                                    .fillMaxSize()
+                                    .clickable(
+                                        interactionSource = null,
+                                        indication = null
+                                    ) {
+                                        line.errorMessage?.let {
+                                            Toast
+                                                .makeText(
+                                                    context,
+                                                    it.asString(context),
+                                                    Toast.LENGTH_LONG
+                                                )
+                                                .show()
+                                        }
+                                    }
+                            )
+                        }
+                    }
+                }
+            )
+        )
+    }
+}

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/translator_bottom_sheet/ReaderTranslatorBottomSheet.kt

@@ -0,0 +1,321 @@
+@file:OptIn(ExperimentalMaterial3Api::class)
+
+package ua.acclorite.book_story.presentation.screens.reader.components.translator_bottom_sheet
+
+import android.widget.Toast
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.lazy.LazyColumn
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material3.Button
+import androidx.compose.material3.ButtonDefaults
+import androidx.compose.material3.CircularProgressIndicator
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.LocalContentColor
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Switch
+import androidx.compose.material3.SwitchDefaults
+import androidx.compose.material3.Text
+import androidx.compose.material3.contentColorFor
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.StrokeCap
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.presentation.components.CustomBottomSheet
+import ua.acclorite.book_story.presentation.screens.reader.data.ReaderEvent
+import ua.acclorite.book_story.presentation.screens.reader.data.ReaderState
+import ua.acclorite.book_story.presentation.screens.settings.components.SwitchWithTitle
+import java.util.Locale
+
+/**
+ * Reader Translator Bottom Sheet. You can set up preferences for an individual book here and apply/cancel translation.
+ *
+ * @param state [ReaderState].
+ * @param onEvent [ReaderEvent] callback.
+ */
+@Composable
+fun ReaderTranslatorBottomSheet(
+    state: State<ReaderState>,
+    onEvent: (ReaderEvent) -> Unit
+) {
+    val context = LocalContext.current
+    val book = remember(state.value) { state.value.book }
+
+    val translateFrom = remember(book.translateFrom) {
+        if (book.translateFrom == "auto") {
+            return@remember context.getString(R.string.translator_auto_short)
+        }
+
+        val locale = Locale(book.translateFrom)
+        locale.getDisplayName(locale).replaceFirstChar { char ->
+            char.uppercase()
+        }
+    }
+    val translateTo = remember(book.translateTo) {
+        val locale = Locale(book.translateTo)
+        locale.getDisplayName(locale).replaceFirstChar { char ->
+            char.uppercase()
+        }
+    }
+
+    val loading = remember { mutableStateOf(false) }
+    val textTranslated = remember(state.value.isTranslating, state.value.text) {
+        loading.value = true
+
+        val hasTranslatedText = state.value.text.any {
+            it.value.useTranslation && it.value.translatedLine != null
+        }
+        val loaded = state.value.text.none {
+            it.value.isTranslationLoading
+        }
+
+        loading.value = false
+
+        !state.value.isTranslating && hasTranslatedText && loaded
+    }
+
+    CustomBottomSheet(
+        onDismissRequest = {
+            onEvent(ReaderEvent.OnShowHideTranslatorBottomSheet())
+        }
+    ) {
+        LazyColumn(Modifier.fillMaxWidth()) {
+            item {
+                Row(
+                    Modifier
+                        .fillMaxWidth()
+                        .padding(horizontal = 18.dp)
+                        .clip(RoundedCornerShape(25.dp))
+                        .background(
+                            if (book.enableTranslator) MaterialTheme.colorScheme.primary
+                            else MaterialTheme.colorScheme.outline,
+                            RoundedCornerShape(25.dp)
+                        )
+                        .clickable {
+                            if (book.enableTranslator) {
+                                onEvent(ReaderEvent.OnCancelTranslation)
+                            }
+
+                            onEvent(
+                                ReaderEvent.OnChangeTranslatorSettings(
+                                    enableTranslator = !book.enableTranslator
+                                )
+                            )
+                        }
+                        .padding(horizontal = 15.dp, vertical = 16.dp),
+                    verticalAlignment = Alignment.CenterVertically,
+                    horizontalArrangement = Arrangement.SpaceBetween
+                ) {
+                    Text(
+                        text = stringResource(id = R.string.translator_reader_settings),
+                        color = if (book.enableTranslator) MaterialTheme.colorScheme.onPrimary
+                        else MaterialTheme.colorScheme.surface,
+                        fontSize = 17.5.sp
+                    )
+                    Switch(
+                        checked = book.enableTranslator,
+                        onCheckedChange = null,
+                        colors = SwitchDefaults.colors(
+                            checkedThumbColor = MaterialTheme.colorScheme.primary,
+                            checkedTrackColor = MaterialTheme.colorScheme.secondaryContainer,
+                            uncheckedBorderColor = MaterialTheme.colorScheme.surfaceContainerHighest
+                        )
+                    )
+                }
+            }
+
+            item {
+                Spacer(modifier = Modifier.height(12.dp))
+            }
+
+            item {
+                ReaderTranslatorBottomSheetLanguageChooser(
+                    fromLanguage = translateFrom,
+                    toLanguage = translateTo,
+                    onFromClick = {
+                        onEvent(
+                            ReaderEvent.OnShowHideLanguageBottomSheet(
+                                show = true,
+                                translateFrom = true
+                            )
+                        )
+                    },
+                    onToClick = {
+                        onEvent(
+                            ReaderEvent.OnShowHideLanguageBottomSheet(
+                                show = true,
+                                translateFrom = false
+                            )
+                        )
+                    },
+                    enabled = !state.value.isTranslating,
+                    switchEnabled = book.translateFrom != "auto",
+                    onSwitchClick = {
+                        onEvent(
+                            ReaderEvent.OnChangeTranslatorSettings(
+                                translateFrom = book.translateTo,
+                                translateTo = book.translateFrom
+                            )
+                        )
+                    }
+                )
+            }
+
+            item {
+                Spacer(modifier = Modifier.height(6.dp))
+            }
+
+            item {
+                SwitchWithTitle(
+                    selected = book.doubleClickTranslation,
+                    title = stringResource(id = R.string.translator_double_click_to_translate_option),
+                    description = stringResource(id = R.string.translator_double_click_to_translate_option_desc),
+                    verticalPadding = 6.dp,
+                    onClick = {
+                        onEvent(
+                            ReaderEvent.OnChangeTranslatorSettings(
+                                doubleClickTranslation = !book.doubleClickTranslation
+                            )
+                        )
+                    }
+                )
+            }
+
+            item {
+                SwitchWithTitle(
+                    selected = book.translateWhenOpen,
+                    title = stringResource(id = R.string.translator_translate_on_start_option),
+                    description = stringResource(id = R.string.translator_translate_on_start_option_desc),
+                    verticalPadding = 6.dp,
+                    onClick = {
+                        onEvent(
+                            ReaderEvent.OnChangeTranslatorSettings(
+                                translateWhenOpen = !book.translateWhenOpen
+                            )
+                        )
+                    }
+                )
+            }
+
+            item {
+                Spacer(modifier = Modifier.height(48.dp))
+            }
+
+            item {
+                Box(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(horizontal = 18.dp),
+                    contentAlignment = Alignment.CenterEnd
+                ) {
+                    Button(
+                        modifier = Modifier.fillMaxWidth(1f),
+                        onClick = {
+                            if (loading.value) {
+                                return@Button
+                            }
+
+                            if (!state.value.isTranslating) {
+                                if (!textTranslated) {
+                                    Toast.makeText(
+                                        context,
+                                        context.getString(R.string.translator_starting),
+                                        Toast.LENGTH_SHORT
+                                    ).show()
+                                    onEvent(
+                                        ReaderEvent.OnTranslateText(
+                                            keys = null, /* means translating the whole text */
+                                            error = {
+                                                Toast.makeText(
+                                                    context,
+                                                    it.asString(context),
+                                                    Toast.LENGTH_LONG
+                                                ).show()
+                                            }
+                                        )
+                                    )
+                                } else {
+                                    Toast.makeText(
+                                        context,
+                                        context.getString(R.string.translator_text_canceling),
+                                        Toast.LENGTH_SHORT
+                                    ).show()
+                                    onEvent(
+                                        ReaderEvent.OnUndoTranslation(
+                                            null /* means canceling the whole text translation */
+                                        )
+                                    )
+                                }
+                            } else {
+                                Toast.makeText(
+                                    context,
+                                    context.getString(R.string.translator_canceling),
+                                    Toast.LENGTH_SHORT
+                                ).show()
+
+                                loading.value = true
+                                onEvent(
+                                    ReaderEvent.OnCancelTranslation
+                                )
+                            }
+                        },
+                        colors = ButtonDefaults.buttonColors(
+                            containerColor = if (state.value.isTranslating || textTranslated) {
+                                MaterialTheme.colorScheme.secondary
+                            } else {
+                                MaterialTheme.colorScheme.primary
+                            },
+                            contentColor = contentColorFor(
+                                if (state.value.isTranslating || textTranslated) {
+                                    MaterialTheme.colorScheme.secondary
+                                } else {
+                                    MaterialTheme.colorScheme.primary
+                                }
+                            )
+                        )
+                    ) {
+                        if (!state.value.isTranslating && !loading.value) {
+                            Text(
+                                text = if (textTranslated) stringResource(
+                                    id = R.string.undo_translation
+                                ) else stringResource(id = R.string.translate)
+                            )
+                        } else {
+                            CircularProgressIndicator(
+                                color = LocalContentColor.current,
+                                strokeCap = StrokeCap.Round,
+                                modifier = Modifier.size(21.dp),
+                                strokeWidth = 2.3.dp
+                            )
+                        }
+                    }
+                }
+            }
+
+            item {
+                Spacer(
+                    modifier = Modifier.height(
+                        8.dp + it
+                    )
+                )
+            }
+        }
+    }
+}

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/components/translator_bottom_sheet/ReaderTranslatorBottomSheetLanguageChooser.kt

@@ -0,0 +1,191 @@
+package ua.acclorite.book_story.presentation.screens.reader.components.translator_bottom_sheet
+
+import androidx.compose.animation.core.tween
+import androidx.compose.animation.fadeIn
+import androidx.compose.animation.fadeOut
+import androidx.compose.animation.scaleOut
+import androidx.compose.animation.slideInHorizontally
+import androidx.compose.animation.slideOutHorizontally
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.CompareArrows
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.clip
+import androidx.compose.ui.unit.Dp
+import androidx.compose.ui.unit.dp
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.yield
+import ua.acclorite.book_story.R
+import ua.acclorite.book_story.presentation.components.CustomAnimatedVisibility
+import ua.acclorite.book_story.presentation.components.CustomIconButton
+
+/**
+ * Reader Translator BottomSheet Language Chooser.
+ *
+ * @param fromLanguage Current translate from language.
+ * @param toLanguage Current translate to language.
+ * @param enabled Whether it is enabled.
+ * @param switchEnabled Whether switch languages button is enabled.
+ * @param horizontalPadding Horizontal item padding.
+ * @param onFromClick OnFromClick callback.
+ * @param onToClick OnToClick callback.
+ * @param onSwitchClick OnSwitchClick callback.
+ */
+@Composable
+fun ReaderTranslatorBottomSheetLanguageChooser(
+    fromLanguage: String,
+    toLanguage: String,
+    enabled: Boolean = true,
+    switchEnabled: Boolean = true,
+    horizontalPadding: Dp = 18.dp,
+    onFromClick: () -> Unit,
+    onToClick: () -> Unit,
+    onSwitchClick: () -> Unit
+) {
+    val switchLanguage = remember { mutableStateOf(false) }
+    val scope = rememberCoroutineScope()
+    var job: Job? = null
+
+    Row(
+        Modifier
+            .fillMaxWidth()
+            .padding(horizontal = horizontalPadding),
+        verticalAlignment = Alignment.CenterVertically
+    ) {
+        Box(modifier = Modifier.weight(1f)) {
+            CustomLanguageSwitchingAnimation(
+                visible = switchLanguage.value,
+                rightPlacement = false
+            ) {
+                LanguageItem(text = fromLanguage, enabled = enabled) {
+                    onFromClick()
+                }
+            }
+
+            CustomLanguageSwitchingAnimation(
+                visible = !switchLanguage.value,
+                rightPlacement = false
+            ) {
+                LanguageItem(text = fromLanguage, enabled = enabled) {
+                    onFromClick()
+                }
+            }
+        }
+
+
+
+        Spacer(modifier = Modifier.width(4.dp))
+        CustomIconButton(
+            icon = Icons.AutoMirrored.Filled.CompareArrows,
+            contentDescription = R.string.translator_language_content_desc,
+            disableOnClick = false,
+            color = MaterialTheme.colorScheme.onSurfaceVariant,
+            modifier = Modifier.size(24.dp),
+            enabled = enabled && switchEnabled,
+            onClick = {
+                job?.cancel()
+                job = scope.launch {
+                    switchLanguage.value = !switchLanguage.value
+
+                    delay(100)
+                    yield()
+
+                    onSwitchClick()
+                }
+            }
+        )
+        Spacer(modifier = Modifier.width(4.dp))
+
+        Box(modifier = Modifier.weight(1f)) {
+            CustomLanguageSwitchingAnimation(
+                visible = switchLanguage.value,
+                rightPlacement = true
+            ) {
+                LanguageItem(text = toLanguage, enabled = enabled) {
+                    onToClick()
+                }
+            }
+
+            CustomLanguageSwitchingAnimation(
+                visible = !switchLanguage.value,
+                rightPlacement = true
+            ) {
+                LanguageItem(text = toLanguage, enabled = enabled) {
+                    onToClick()
+                }
+            }
+        }
+    }
+}
+
+@Composable
+private fun CustomLanguageSwitchingAnimation(
+    visible: Boolean,
+    rightPlacement: Boolean,
+    content: @Composable () -> Unit
+) {
+    val exitRightAnimation = remember {
+        fadeOut(tween(200)) +
+                slideOutHorizontally(tween(250)) { -it / 2 } +
+                scaleOut(tween(250), 0.4f)
+    }
+    val enterRightAnimation = remember {
+        slideInHorizontally(tween(350)) { -it / 2 } + fadeIn(tween(200))
+    }
+
+    val exitLeftAnimation = remember {
+        fadeOut(tween(200)) +
+                slideOutHorizontally(tween(250)) { it / 2 } +
+                scaleOut(tween(250), 0.4f)
+    }
+    val enterLeftAnimation = remember {
+        slideInHorizontally(tween(350)) { it / 2 } + fadeIn(tween(200))
+    }
+
+    CustomAnimatedVisibility(
+        visible = visible,
+        enter = if (rightPlacement) enterRightAnimation else enterLeftAnimation,
+        exit = if (rightPlacement) exitRightAnimation else exitLeftAnimation
+    ) {
+        content()
+    }
+}
+
+@Composable
+private fun LanguageItem(text: String, enabled: Boolean, onClick: () -> Unit) {
+    Box(
+        modifier = Modifier
+            .fillMaxWidth()
+            .clip(MaterialTheme.shapes.large)
+            .background(MaterialTheme.colorScheme.surfaceContainerHigh, MaterialTheme.shapes.large)
+            .clickable(enabled = enabled) {
+                onClick()
+            }
+            .padding(horizontal = 4.dp, vertical = 14.dp),
+        contentAlignment = Alignment.Center
+    ) {
+        Text(
+            text = text,
+            color = MaterialTheme.colorScheme.onSurface,
+            style = MaterialTheme.typography.bodyMedium,
+            maxLines = 1
+        )
+    }
+}

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/data/ReaderEvent.kt

@@ -1,29 +1,70 @@
 package ua.acclorite.book_story.presentation.screens.reader.data
 
 import androidx.activity.ComponentActivity
-import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.foundation.pager.PagerState
 import androidx.compose.runtime.Immutable
 import ua.acclorite.book_story.domain.model.Book
+import ua.acclorite.book_story.domain.model.LineWithTranslation
+import ua.acclorite.book_story.domain.model.SelectableLanguage
+import ua.acclorite.book_story.domain.util.ID
+import ua.acclorite.book_story.domain.util.LanguageCode
+import ua.acclorite.book_story.domain.util.UIText
 import ua.acclorite.book_story.presentation.data.Navigator
 
 @Immutable
 sealed class ReaderEvent {
     data class OnTextIsEmpty(val onLoaded: () -> Unit) : ReaderEvent()
     data class OnLoadText(
-        val listState: LazyListState,
         val refreshList: (Book) -> Unit,
         val onLoaded: () -> Unit,
+        val onError: (UIText) -> Unit,
         val onTextIsEmpty: () -> Unit
     ) : ReaderEvent()
 
     data class OnShowHideMenu(val show: Boolean? = null, val context: ComponentActivity) :
         ReaderEvent()
 
+    data class OnShowHideTranslatorBottomSheet(val show: Boolean? = null) : ReaderEvent()
+
+    data class OnChangeTranslatorSettings(
+        val enableTranslator: Boolean? = null,
+        val translateFrom: String? = null,
+        val translateTo: String? = null,
+        val doubleClickTranslation: Boolean? = null,
+        val translateWhenOpen: Boolean? = null
+    ) : ReaderEvent()
+
+    data class OnShowHideLanguageBottomSheet(
+        val show: Boolean? = null,
+        val translateFrom: Boolean? = null
+    ) : ReaderEvent()
+
+    data class OnTranslateText(
+        val keys: Set<ID>?,
+        val error: suspend (UIText) -> Unit
+    ) : ReaderEvent()
+
+    data object OnDismissDownloadLanguageDialog : ReaderEvent()
+
+    data object OnCancelTranslation : ReaderEvent()
+
+    data class OnUndoTranslation(val id: ID?) : ReaderEvent()
+
+    data class OnDownloadLanguages(
+        val onSuccess: suspend (Map<ID, LineWithTranslation>) -> Unit,
+        val error: suspend (UIText) -> Unit
+    ) : ReaderEvent()
+
+    data class OnSelectLanguage(val language: SelectableLanguage) : ReaderEvent()
+
+    data class OnUpdateLanguage(
+        val languageCode: LanguageCode,
+        val calculation: (SelectableLanguage) -> SelectableLanguage
+    ) : ReaderEvent()
+
     data class OnGoBack(
         val context: ComponentActivity,
         val navigator: Navigator,
-        val listState: LazyListState,
         val refreshList: (Book) -> Unit,
         val navigate: (Navigator) -> Unit
     ) : ReaderEvent()
@@ -36,18 +77,17 @@ sealed class ReaderEvent {
         val refreshList: (Book) -> Unit
     ) : ReaderEvent()
 
-    data class OnScroll(val listState: LazyListState, val progress: Float) : ReaderEvent()
+    data class OnScroll(val progress: Float) : ReaderEvent()
     data object OnShowHideSettingsBottomSheet : ReaderEvent()
     data class OnScrollToSettingsPage(val page: Int, val pagerState: PagerState) : ReaderEvent()
     data class OnMoveBookToAlreadyRead(
         val context: ComponentActivity,
-        val listState: LazyListState,
         val onUpdateCategories: (Book) -> Unit,
         val updatePage: (Int) -> Unit,
         val navigator: Navigator
     ) : ReaderEvent()
 
-    data class OnTranslateText(
+    data class OnOpenTranslator(
         val textToTranslate: String,
         val context: ComponentActivity,
         val noAppsFound: () -> Unit

app/src/main/java/ua/acclorite/book_story/presentation/screens/reader/data/ReaderState.kt

@@ -1,23 +1,35 @@
 package ua.acclorite.book_story.presentation.screens.reader.data
 
+import androidx.compose.foundation.lazy.LazyListState
 import androidx.compose.runtime.Immutable
 import ua.acclorite.book_story.domain.model.Book
-import ua.acclorite.book_story.domain.model.StringWithId
+import ua.acclorite.book_story.domain.model.LineWithTranslation
+import ua.acclorite.book_story.domain.model.SelectableLanguage
 import ua.acclorite.book_story.domain.util.Constants
+import ua.acclorite.book_story.domain.util.ID
 import ua.acclorite.book_story.domain.util.UIText
 
 @Immutable
 data class ReaderState(
     val book: Book = Constants.EMPTY_BOOK,
-    val text: List<StringWithId> = emptyList(),
+    val text: Map<ID, LineWithTranslation> = emptyMap(),
     val words: Int = 0,
     val letters: Int = 0,
+    val listState: LazyListState = LazyListState(),
+
+    val languagesToTranslate: List<SelectableLanguage> = emptyList(),
+    val showDownloadLanguageDialog: Boolean = false,
+    val isTranslating: Boolean = false,
 
     val errorMessage: UIText? = null,
 
     val showMenu: Boolean = false,
     val lockMenu: Boolean = false,
 
+    val showTranslatorBottomSheet: Boolean = false,
+    val showLanguageBottomSheet: Boolean = false,
+    val languageBottomSheetTranslateFrom: Boolean = false,
+
     val showSettingsBottomSheet: Boolean = false,
     val currentPage: Int = 0,
 )

app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/data/SettingsEvent.kt

@@ -15,4 +15,9 @@ sealed class SettingsEvent {
         val notificationsPermissionState: PermissionState,
         val onChangeCheckForUpdates: (Boolean) -> Unit
     ) : SettingsEvent()
+
+    data class OnReaderShowHideTranslatorLanguageBottomSheet(
+        val show: Boolean? = null,
+        val translateFrom: Boolean? = null
+    ) : SettingsEvent()
 }

app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/data/SettingsState.kt

@@ -0,0 +1,9 @@
+package ua.acclorite.book_story.presentation.screens.settings.data
+
+import androidx.compose.runtime.Immutable
+
+@Immutable
+data class SettingsState(
+    val showReaderTranslatorLanguageBottomSheet: Boolean = false,
+    val readerTranslatorLanguageBottomSheetTranslateFrom: Boolean = false,
+)

app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/data/SettingsViewModel.kt

@@ -11,6 +11,9 @@ import com.google.accompanist.permissions.shouldShowRationale
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.yield
 import javax.inject.Inject
@@ -21,6 +24,9 @@ class SettingsViewModel @Inject constructor(
 
 ) : ViewModel() {
 
+    private val _state = MutableStateFlow(SettingsState())
+    val state = _state.asStateFlow()
+
     private var notificationsPermissionJob: Job? = null
 
     fun onEvent(event: SettingsEvent) {
@@ -71,6 +77,17 @@ class SettingsViewModel @Inject constructor(
                     }
                 }
             }
+
+            is SettingsEvent.OnReaderShowHideTranslatorLanguageBottomSheet -> {
+                _state.update {
+                    it.copy(
+                        showReaderTranslatorLanguageBottomSheet = event.show
+                            ?: !it.showReaderTranslatorLanguageBottomSheet,
+                        readerTranslatorLanguageBottomSheetTranslateFrom = event.translateFrom
+                            ?: false
+                    )
+                }
+            }
         }
     }
 }

app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/appearance/components/theme_switcher/AppearanceSettingsThemeSwitcherItem.kt

@@ -39,7 +39,14 @@ import ua.acclorite.book_story.presentation.ui.ThemeContrast
 import ua.acclorite.book_story.presentation.ui.animatedColorScheme
 
 /**
- * Theme switcher item.
+ * Theme switcher item. Used to change app theme.
+ *
+ * @param theme Target [Theme].
+ * @param darkTheme Whether should be shown in Dark Theme.
+ * @param isPureDark Whether should be shown in Pure Dark.
+ * @param themeContrast [ThemeContrast].
+ * @param selected True if this theme is currently selected.
+ * @param onClick OnClick callback.
  */
 @Composable
 fun AppearanceSettingsThemeSwitcherItem(
@@ -69,7 +76,8 @@ fun AppearanceSettingsThemeSwitcherItem(
                     onClick()
                 }
                 .background(
-                    colorScheme.surface
+                    colorScheme.surface,
+                    MaterialTheme.shapes.large
                 )
                 .border(
                     4.dp,
@@ -87,10 +95,9 @@ fun AppearanceSettingsThemeSwitcherItem(
             ) {
                 Box(
                     Modifier
-                        .clip(RoundedCornerShape(10.dp))
                         .height(20.dp)
                         .width(80.dp)
-                        .background(colorScheme.onSurface)
+                        .background(colorScheme.onSurface, RoundedCornerShape(10.dp))
                 )
                 Spacer(modifier = Modifier.width(8.dp))
 
@@ -117,9 +124,9 @@ fun AppearanceSettingsThemeSwitcherItem(
                     .padding(start = 8.dp)
                     .height(80.dp)
                     .width(70.dp)
-                    .clip(RoundedCornerShape(14.dp))
                     .background(
-                        colorScheme.surfaceContainer
+                        colorScheme.surfaceContainer,
+                        RoundedCornerShape(14.dp)
                     )
             )
             Spacer(modifier = Modifier.height(40.dp))
@@ -135,16 +142,14 @@ fun AppearanceSettingsThemeSwitcherItem(
             ) {
                 Box(
                     Modifier
-                        .clip(CircleShape)
                         .size(20.dp)
-                        .background(colorScheme.primary)
+                        .background(colorScheme.primary, CircleShape)
                 )
                 Box(
                     Modifier
-                        .clip(RoundedCornerShape(10.dp))
                         .height(20.dp)
                         .width(60.dp)
-                        .background(colorScheme.onSurfaceVariant)
+                        .background(colorScheme.onSurfaceVariant, RoundedCornerShape(10.dp))
                 )
 
             }

app/src/main/java/ua/acclorite/book_story/presentation/screens/settings/nested/reader/ReaderSettings.kt

@@ -20,6 +20,7 @@ import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.remember
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.input.nestedscroll.nestedScroll
+import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontStyle
 import androidx.compose.ui.unit.dp
@@ -30,26 +31,36 @@ import ua.acclorite.book_story.domain.util.Constants
 import ua.acclorite.book_story.presentation.components.CategoryTitle
 import ua.acclorite.book_story.presentation.components.GoBackButton
 import ua.acclorite.book_story.presentation.components.collapsibleUntilExitScrollBehaviorWithLazyListState
+import ua.acclorite.book_story.presentation.components.translator_language.TranslatorLanguageBottomSheet
 import ua.acclorite.book_story.presentation.data.LocalNavigator
 import ua.acclorite.book_story.presentation.data.MainEvent
 import ua.acclorite.book_story.presentation.data.MainState
 import ua.acclorite.book_story.presentation.data.MainViewModel
 import ua.acclorite.book_story.presentation.data.Navigator
+import ua.acclorite.book_story.presentation.screens.reader.components.translator_bottom_sheet.ReaderTranslatorBottomSheetLanguageChooser
 import ua.acclorite.book_story.presentation.screens.settings.components.ChipsWithTitle
 import ua.acclorite.book_story.presentation.screens.settings.components.SliderWithTitle
 import ua.acclorite.book_story.presentation.screens.settings.components.SwitchWithTitle
+import ua.acclorite.book_story.presentation.screens.settings.data.SettingsEvent
+import ua.acclorite.book_story.presentation.screens.settings.data.SettingsState
+import ua.acclorite.book_story.presentation.screens.settings.data.SettingsViewModel
+import java.util.Locale
 
 @Composable
 fun ReaderSettingsRoot() {
     val navigator = LocalNavigator.current
     val mainViewModel: MainViewModel = hiltViewModel()
+    val settingsViewModel: SettingsViewModel = hiltViewModel()
 
     val state = mainViewModel.state.collectAsState()
+    val settingsState = settingsViewModel.state.collectAsState()
 
     ReaderSettings(
         state = state,
+        settingsState = settingsState,
         navigator = navigator,
-        onMainEvent = mainViewModel::onEvent
+        onMainEvent = mainViewModel::onEvent,
+        onEvent = settingsViewModel::onEvent
     )
 }
 
@@ -57,16 +68,70 @@ fun ReaderSettingsRoot() {
 @Composable
 private fun ReaderSettings(
     state: State<MainState>,
+    settingsState: State<SettingsState>,
     navigator: Navigator,
-    onMainEvent: (MainEvent) -> Unit
+    onMainEvent: (MainEvent) -> Unit,
+    onEvent: (SettingsEvent) -> Unit
 ) {
     val scrollState = TopAppBarDefaults.collapsibleUntilExitScrollBehaviorWithLazyListState()
+    val context = LocalContext.current
 
     val fontFamily = remember(state.value.fontFamily) {
         Constants.FONTS.find {
             it.id == state.value.fontFamily
         } ?: Constants.FONTS[0]
     }
+    val translateFrom = remember(state.value.translateFrom) {
+        if (state.value.translateFrom!! == "auto") {
+            return@remember context.getString(R.string.translator_auto_short)
+        }
+
+        val locale = Locale(state.value.translateFrom!!)
+        locale.getDisplayName(locale).replaceFirstChar { char ->
+            char.uppercase()
+        }
+    }
+    val translateTo = remember(state.value.translateTo) {
+        val locale = Locale(state.value.translateTo!!)
+        locale.getDisplayName(locale).replaceFirstChar { char ->
+            char.uppercase()
+        }
+    }
+
+    if (settingsState.value.showReaderTranslatorLanguageBottomSheet) {
+        TranslatorLanguageBottomSheet(
+            selectedLanguage = if (
+                settingsState.value.readerTranslatorLanguageBottomSheetTranslateFrom
+            ) {
+                state.value.translateFrom!!
+            } else state.value.translateTo!!,
+
+            unselectedLanguage = if (
+                !settingsState.value.readerTranslatorLanguageBottomSheetTranslateFrom
+            ) {
+                state.value.translateFrom!!
+            } else state.value.translateTo!!,
+
+            translateFromSelecting = settingsState.value.readerTranslatorLanguageBottomSheetTranslateFrom,
+            onSelect = { from, to ->
+                onMainEvent(MainEvent.OnChangeTranslateFrom(from))
+                onMainEvent(MainEvent.OnChangeTranslateTo(to))
+
+                onEvent(
+                    SettingsEvent.OnReaderShowHideTranslatorLanguageBottomSheet(
+                        show = false
+                    )
+                )
+            },
+            onDismiss = {
+                onEvent(
+                    SettingsEvent.OnReaderShowHideTranslatorLanguageBottomSheet(
+                        show = false
+                    )
+                )
+            }
+        )
+    }
 
     Scaffold(
         Modifier
@@ -99,6 +164,91 @@ private fun ReaderSettings(
             item {
                 Spacer(modifier = Modifier.height(16.dp))
             }
+            item {
+                CategoryTitle(
+                    title = stringResource(id = R.string.translator_reader_settings),
+                    color = MaterialTheme.colorScheme.primary
+                )
+            }
+            item {
+                Spacer(modifier = Modifier.height(8.dp))
+            }
+
+            item {
+                SwitchWithTitle(
+                    selected = state.value.enableTranslator!!,
+                    title = stringResource(id = R.string.translator_enable_default_option),
+                    description = stringResource(id = R.string.translator_enable_default_option_desc),
+                    onClick = {
+                        onMainEvent(
+                            MainEvent.OnChangeEnableTranslator(
+                                !state.value.enableTranslator!!
+                            )
+                        )
+                    }
+                )
+            }
+
+            item {
+                Spacer(modifier = Modifier.height(8.dp))
+
+                CategoryTitle(
+                    title = stringResource(id = R.string.translator_language_option)
+                )
+
+                Spacer(modifier = Modifier.height(8.dp))
+
+                ReaderTranslatorBottomSheetLanguageChooser(
+                    fromLanguage = translateFrom,
+                    toLanguage = translateTo,
+                    onFromClick = {
+                        onEvent(
+                            SettingsEvent.OnReaderShowHideTranslatorLanguageBottomSheet(
+                                show = true,
+                                translateFrom = true
+                            )
+                        )
+                    },
+                    onToClick = {
+                        onEvent(
+                            SettingsEvent.OnReaderShowHideTranslatorLanguageBottomSheet(
+                                show = true,
+                                translateFrom = false
+                            )
+                        )
+                    },
+                    switchEnabled = state.value.translateFrom != "auto",
+                    onSwitchClick = {
+                        val from = state.value.translateFrom!!
+                        val to = state.value.translateTo!!
+
+                        onMainEvent(MainEvent.OnChangeTranslateFrom(to))
+                        onMainEvent(MainEvent.OnChangeTranslateTo(from))
+                    }
+                )
+
+                Spacer(modifier = Modifier.height(8.dp))
+            }
+
+
+            item {
+                SwitchWithTitle(
+                    selected = state.value.doubleClickTranslation!!,
+                    title = stringResource(id = R.string.translator_double_click_to_translate_option),
+                    description = stringResource(id = R.string.translator_double_click_to_translate_option_desc),
+                    onClick = {
+                        onMainEvent(
+                            MainEvent.OnChangeDoubleClickTranslation(
+                                !state.value.doubleClickTranslation!!
+                            )
+                        )
+                    }
+                )
+            }
+
+            item {
+                Spacer(modifier = Modifier.height(22.dp))
+            }
             item {
                 CategoryTitle(
                     title = stringResource(id = R.string.font_reader_settings),
@@ -108,6 +258,7 @@ private fun ReaderSettings(
             item {
                 Spacer(modifier = Modifier.height(8.dp))
             }
+
             item {
                 ChipsWithTitle(
                     title = stringResource(id = R.string.font_family_option),

app/src/main/java/ua/acclorite/book_story/presentation/screens/start/components/StartSettings.kt

@@ -43,7 +43,14 @@ import ua.acclorite.book_story.presentation.screens.start.data.StartState
 import ua.acclorite.book_story.presentation.ui.Theme
 
 /**
- * Settings screen.
+ * Start Settings.
+ *
+ * @param state [StartState].
+ * @param mainState [MainState].
+ * @param onEvent [StartEvent] callback.
+ * @param onMainEvent [MainEvent] callback.
+ * @param storagePermissionState Storage [PermissionState].
+ * @param notificationsPermissionState Notifications [PermissionState].
  */
 @OptIn(ExperimentalPermissionsApi::class)
 @Composable
@@ -123,7 +130,10 @@ fun StartSettings(
             modifier = Modifier
                 .fillMaxSize()
                 .clip(MaterialTheme.shapes.large)
-                .background(MaterialTheme.colorScheme.surfaceContainerLow),
+                .background(
+                    MaterialTheme.colorScheme.surfaceContainerLow,
+                    MaterialTheme.shapes.large
+                ),
         ) {
             StartNavigationScreenItem(
                 state = state,

app/src/main/res/values-uk/strings.xml

@@ -36,6 +36,8 @@
     <string name="move_book">Перемістити книгу?</string>
     <string name="delete_history">Видалити історію читання?</string>
     <string name="confirm_update">Підтвердити оновлення?</string>
+    <string name="download_language">Завантажити %1$s?</string>
+    <string name="download_languages">Завантажити мови?</string>
 
     <!-- Dialog Descriptions -->
     <string name="storage_permission_description">
@@ -78,6 +80,17 @@
         Натиснувши на кнопку «Завантажити», ви перейдете в ваш браузер
         та завантажете останнє оновлення автоматично.
     </string>
+    <string name="download_language_description">
+        Вам потрібно завантажити цю мову перед використанням.
+        Після завантаження, вона буде доступна офлайн та не потребуватиме інтернету.
+        Кожна мова має розмір близько ~30мб, для завантаження рекомендується використовувати Wi-Fi.
+    </string>
+    <string name="download_languages_description">
+        Вам потрібно завантажити ці мови перед використанням.
+        Кожна мова має розмір близько ~30мб, для завантаження рекомендується використовувати Wi-Fi.
+        Ви можете вибрати мови, які ви хочете завантажити,
+        всі не вибрані мови не будуть перекладені.
+    </string>
 
     <!-- Errors -->
     <string name="error_permission">
@@ -104,6 +117,12 @@
         Щось пішло не так.
         Спробуйте пізніше.
     </string>
+    <string name="error_language_not_identified">Мова не була ідентифікована.</string>
+    <string name="error_languages_not_identified">Не вдалося ідентифікувати жодної мови.</string>
+    <string name="error_cannot_select_language">Неможливо вибрати ту саму мову двічі.</string>
+    <string name="error_wrong_language">Не можна вибрати цю мову.</string>
+    <string name="error_could_not_download_language">Не вдалося завантажити мову.</string>
+    <string name="error_could_not_download_languages">Не вдалося завантажити мови.</string>
 
     <!-- Is Empty messages -->
     <string name="browse_empty">
@@ -116,6 +135,9 @@
         Нехай ваша остання прочитана книга відкриє перед
         вами сторінки нової великої історії вашого читацького шляху
     </string>
+    <string name="translator_languages_empty">
+        Не існує мови з такою назвою, або вона не підтримується
+    </string>
 
     <!-- Query strings -->
     <string name="selected_items_count_query">%1$s обрано</string>
@@ -150,11 +172,14 @@
     <string name="no">Ні</string>
     <string name="download">Завантажити</string>
     <string name="done">Готово</string>
+    <string name="undo_translation">Відмінити</string>
+    <string name="continue_download">Далі</string>
 
     <!-- Items -->
     <string name="files">файли</string>
     <string name="books">книги</string>
     <string name="history">історію</string>
+    <string name="languages">мови</string>
 
     <!-- Book -->
     <string name="unknown_author">Невідомий</string>
@@ -181,13 +206,14 @@
     <string name="general_settings">Головні</string>
     <string name="general_settings_desc">Мова застосунка</string>
     <string name="appearance_settings">Зовнішній вигляд</string>
-    <string name="appearance_settings_desc">Налаштування теми, кольори</string>
+    <string name="appearance_settings_desc">Тема, кольори</string>
     <string name="reader_settings">Читач</string>
-    <string name="reader_settings_desc">Налаштування шрифта, налаштування текста</string>
+    <string name="reader_settings_desc">Перекладач, шрифт, текст</string>
 
     <!-- Settings subcategories -->
     <string name="font_reader_settings">Шрифт</string>
     <string name="text_reader_settings">Текст</string>
+    <string name="translator_reader_settings">Перекладач</string>
     <string name="theme_appearance_settings">Налаштування теми</string>
     <string name="colors_appearance_settings">Кольори</string>
 
@@ -208,6 +234,13 @@
     <string name="check_for_updates_option">Перевіряти на оновлення</string>
     <string name="check_for_updates_option_desc">Перевіряти на новішу версію застосунку при запуску</string>
     <string name="side_padding_option">Бокові відступи</string>
+    <string name="translator_language_option">Мова перекладача</string>
+    <string name="translator_enable_default_option">Увімкнути перекладач</string>
+    <string name="translator_enable_default_option_desc">Увімкнути перекладач при додаванні книги за замовчуванням</string>
+    <string name="translator_double_click_to_translate_option">Переклад подвійним кліком</string>
+    <string name="translator_double_click_to_translate_option_desc">Двічі клацніть на абзац, щоб перекласти його</string>
+    <string name="translator_translate_on_start_option">Перекладати при відкритті книги</string>
+    <string name="translator_translate_on_start_option_desc">Автоматично перекладати весь текст при відкритті книги</string>
 
     <!-- Colors -->
     <string name="red_color">Червоний</string>
@@ -255,7 +288,12 @@
     <string name="book_moved">Ця книга була успішно переміщена.</string>
     <string name="copied">Скопійовано</string>
     <string name="history_deleted">Історія була успішно видалена.</string>
-    <string name="no_updates">Остання версія застосунку вже встановлена.</string>
+    <string name="no_updates">Остання версія застосунка вже встановлена.</string>
+    <string name="language_downloaded">Мова була успішно завантажена та вибрана.</string>
+    <string name="languages_downloaded">Всі необхідні мови завантажені. Переклад почнеться незабаром.</string>
+    <string name="translator_canceling">Переклад відміняється. Будь ласка, зачекайте.</string>
+    <string name="translator_text_canceling">Перекладений текст відміняється. Будь ласка, зачекайте.</string>
+    <string name="translator_starting">Переклад скоро почнеться. Будь ласка, зачекайте.</string>
 
     <!-- Snackbar messages -->
     <string name="history_element_deleted">Елемент історії був успішно видалений.</string>
@@ -282,14 +320,25 @@
         Дякуємо за те, що прочитали \"%1$s\" з нами.
         Ми сподіваємось, що вам сподобалася ця книга!
     </string>
-    <string name="letters_and_words">%1$s букв, %2$s слів.</string>
+    <string name="letters_and_words">%1$s букв(а), %2$s слів.</string>
+
+    <!-- Translator -->
+    <string name="translator_auto">Визначити мову</string>
+    <string name="translator_auto_short">Визначити</string>
+    <string name="translator_query">Перекласти %1$s</string>
+    <string name="translator_from">з</string>
+    <string name="translator_to">на</string>
+    <string name="translator_all_languages">Всі мови</string>
+    <string name="translator_recent_languages">Недавні мови</string>
+    <string name="translator_occurrences">%1$s абзац(ів)</string>
+    <string name="translator_show_original">Показати оригінал (%1$s на %2$s)</string>
 
     <!-- About -->
-    <string name="app_version_option">Версія застосунку</string>
+    <string name="app_version_option">Версія застосунка</string>
     <string name="app_version_option_desc_1">Версія v%1$s</string>
     <string name="app_version_option_desc_2">Натисніть, щоб перевірити на оновлення</string>
     <string name="report_bug_option">Повідомити про помилку</string>
-    <string name="project_page_option">Сторінка проєкту</string>
+    <string name="project_page_option">Сторінка проєкта</string>
     <string name="support_option">Підтримати мою роботу</string>
     <string name="licenses_option">Ліцензії з відкритим кодом</string>
     <string name="credits_option">Заслуги</string>
@@ -474,6 +523,8 @@
     <string name="reset_start_content_desc">Скинути початковий посібник</string>
     <string name="hide_edit_title_content_desc">Вийти з редагування назви</string>
     <string name="open_in_web_content_desc">Відкрити в браузері</string>
-
+    <string name="translator_content_desc">Перекладач</string>
+    <string name="translator_language_content_desc">Поміняти мови місцями</string>
+    <string name="downloaded_content_desc">Завантажено</string>
 
 </resources>

app/src/main/res/values/strings.xml

@@ -55,6 +55,8 @@
     <string name="move_book">Move book?</string>
     <string name="delete_history">Delete reading history?</string>
     <string name="confirm_update">Confirm update?</string>
+    <string name="download_language">Download %1$s?</string>
+    <string name="download_languages">Download languages?</string>
 
     <!-- Dialog Descriptions -->
     <string name="storage_permission_description">
@@ -97,6 +99,17 @@
         By clicking the «Download» button you will be transferred
         to your browser and download the latest update automatically.
     </string>
+    <string name="download_language_description">
+        You need to download this language before using it.
+        After downloading, it will be available offline and will not require internet.
+        Each language is about ~30mb in size, it is recommended to use Wi-Fi to download it.
+    </string>
+    <string name="download_languages_description">
+        You need to download these languages before.
+        Each language is about ~30mb in size, it is recommended to use Wi-Fi to download it.
+        You can select which languages you want to download,
+        all unselected languages will not be translated.
+    </string>
 
     <!-- Errors -->
     <string name="error_permission">
@@ -123,6 +136,12 @@
         Something went wrong.
         Try again later.
     </string>
+    <string name="error_language_not_identified">Could not identify language.</string>
+    <string name="error_languages_not_identified">Could not identify any languages.</string>
+    <string name="error_cannot_select_language">Cannot select same language twice.</string>
+    <string name="error_wrong_language">Cannot select this language.</string>
+    <string name="error_could_not_download_language">Could not download language.</string>
+    <string name="error_could_not_download_languages">Could not download languages.</string>
 
     <!-- Is Empty messages -->
     <string name="browse_empty">
@@ -134,6 +153,9 @@
     <string name="history_empty">
         Let your last book you read open the pages of a new great story of your reading journey
     </string>
+    <string name="translator_languages_empty">
+        There is no such language with this name, or it is not supported
+    </string>
 
     <!-- Query strings -->
     <string name="selected_items_count_query">%1$s selected</string>
@@ -168,11 +190,14 @@
     <string name="no">No</string>
     <string name="download">Download</string>
     <string name="done">Done</string>
+    <string name="undo_translation">Undo</string>
+    <string name="continue_download">Continue</string>
 
     <!-- Items -->
     <string name="files">files</string>
     <string name="books">books</string>
     <string name="history">history</string>
+    <string name="languages">languages</string>
 
     <!-- Book -->
     <string name="unknown_author">Unknown</string>
@@ -199,13 +224,14 @@
     <string name="general_settings">General</string>
     <string name="general_settings_desc">App language</string>
     <string name="appearance_settings">Appearance</string>
-    <string name="appearance_settings_desc">Theme preferences, colors</string>
+    <string name="appearance_settings_desc">Theme, colors</string>
     <string name="reader_settings">Reader</string>
-    <string name="reader_settings_desc">Font settings, text settings</string>
+    <string name="reader_settings_desc">Translator, font, text</string>
 
     <!-- Settings subcategories -->
     <string name="font_reader_settings">Font</string>
     <string name="text_reader_settings">Text</string>
+    <string name="translator_reader_settings">Translator</string>
     <string name="theme_appearance_settings">Theme preferences</string>
     <string name="colors_appearance_settings">Colors</string>
 
@@ -226,6 +252,13 @@
     <string name="check_for_updates_option">Check for updates</string>
     <string name="check_for_updates_option_desc">Check for newer app version on startup</string>
     <string name="side_padding_option">Side padding</string>
+    <string name="translator_language_option">Translator language</string>
+    <string name="translator_enable_default_option">Enable translator</string>
+    <string name="translator_enable_default_option_desc">Enable translator when adding a book by default</string>
+    <string name="translator_double_click_to_translate_option">Double click translation</string>
+    <string name="translator_double_click_to_translate_option_desc">Double click on paragraph to translate it</string>
+    <string name="translator_translate_on_start_option">Translate when open a book</string>
+    <string name="translator_translate_on_start_option_desc">Automatically translate the whole text when open a book</string>
 
     <!-- Colors -->
     <string name="red_color">Red</string>
@@ -274,6 +307,13 @@
     <string name="copied">Copied</string>
     <string name="history_deleted">History was successfully deleted.</string>
     <string name="no_updates">The latest version of the app is already installed.</string>
+    <string name="language_downloaded">Language was successfully downloaded and selected.</string>
+    <string name="languages_downloaded">
+        All required languages are downloaded. Translation will start soon.
+    </string>
+    <string name="translator_canceling">Translation is canceling. Please wait.</string>
+    <string name="translator_text_canceling">Translated text is canceling. Please wait.</string>
+    <string name="translator_starting">Translation will start soon. Please wait.</string>
 
     <!-- Snackbar messages -->
     <string name="history_element_deleted">History element was successfully deleted.</string>
@@ -302,6 +342,17 @@
     </string>
     <string name="letters_and_words">%1$s characters, %2$s words.</string>
 
+    <!-- Translator -->
+    <string name="translator_auto">Detect language</string>
+    <string name="translator_auto_short">Detect</string>
+    <string name="translator_query">Translate %1$s</string>
+    <string name="translator_from">from</string>
+    <string name="translator_to">to</string>
+    <string name="translator_all_languages">All languages</string>
+    <string name="translator_recent_languages">Recent languages</string>
+    <string name="translator_occurrences">%1$s paragraph(s)</string>
+    <string name="translator_show_original">Show original (%1$s to %2$s)</string>
+
     <!-- About -->
     <string name="app_version_option">App version</string>
     <string name="app_version_option_desc_1">Version v%1$s</string>
@@ -493,5 +544,8 @@
     <string name="reset_start_content_desc">Reset start guide</string>
     <string name="hide_edit_title_content_desc">Exit title editing</string>
     <string name="open_in_web_content_desc">Open in web</string>
+    <string name="translator_content_desc">Translator</string>
+    <string name="translator_language_content_desc">Change language places</string>
+    <string name="downloaded_content_desc">Downloaded</string>
 
 </resources>

build.gradle.kts

@@ -1,7 +1,11 @@
 plugins {
-    id("com.android.application") version "8.2.0-rc03" apply false
+    id("com.android.application") version "8.3.0" apply false
-    id("org.jetbrains.kotlin.android") version "1.9.21" apply false
+    id("org.jetbrains.kotlin.android") version "2.0.0" apply false
-    id("com.google.devtools.ksp") version "1.9.21-1.0.16" apply false
+    id("org.jetbrains.kotlin.plugin.compose") version "2.0.0" apply false
+    id("com.google.devtools.ksp") version "2.0.0-1.0.21" apply false
     id("com.google.dagger.hilt.android") version "2.50" apply false
     id("com.mikepenz.aboutlibraries.plugin") version "11.1.3" apply false
+    id("androidx.room") version "2.6.1" apply false
+    kotlin("jvm") version "2.0.0" apply true
+    kotlin("plugin.serialization") version "2.0.0" apply false
 }