feat: add loading indicator to book info's file loading

app/src/main/java/ua/acclorite/book_story/presentation/book_info/BookInfoModel.kt

@@ -257,7 +257,8 @@ class BookInfoModel @Inject constructor(
                             it.copy(
                                 book = it.book.copy(
                                     filePath = event.path
-                                )
+                                ),
+                                loadingFile = true
                             )
                         }
                         updateBookUseCase(_state.value.book)
@@ -270,7 +271,8 @@ class BookInfoModel @Inject constructor(
                         val file = getFileFromBookUseCase(_state.value.book.id)
                         _state.update {
                             it.copy(
-                                file = file
+                                file = file,
+                                loadingFile = false
                             )
                         }
                     }
@@ -380,7 +382,8 @@ class BookInfoModel @Inject constructor(
             val file = getFileFromBookUseCase(bookId)
             _state.update {
                 it.copy(
-                    file = file
+                    file = file,
+                    loadingFile = false
                 )
             }
         }

app/src/main/java/ua/acclorite/book_story/presentation/book_info/BookInfoScreen.kt

@@ -79,6 +79,7 @@ data class BookInfoScreen(val bookId: Int) : Screen, Parcelable {
             BookInfoContent(
                 book = state.value.book,
                 file = state.value.file,
+                loadingFile = state.value.loadingFile,
                 categories = categories,
                 bottomSheet = state.value.bottomSheet,
                 dialog = state.value.dialog,

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

@@ -15,7 +15,9 @@ import ua.acclorite.book_story.domain.model.library.Book
 @Immutable
 data class BookInfoState(
     val book: Book = Book.default,
+
     val file: File? = null,
+    val loadingFile: Boolean = true,
 
     val canResetCover: Boolean = false,
 

app/src/main/java/ua/acclorite/book_story/ui/book_info/BookInfoBottomSheet.kt

@@ -18,6 +18,7 @@ fun BookInfoBottomSheet(
     bottomSheet: BottomSheet?,
     book: Book,
     file: File?,
+    loadingFile: Boolean,
     canResetCover: Boolean,
     showPathDialog: (BookInfoEvent.OnShowPathDialog) -> Unit,
     changeCover: (BookInfoEvent.OnChangeCover) -> Unit,
@@ -43,6 +44,7 @@ fun BookInfoBottomSheet(
             BookInfoDetailsBottomSheet(
                 book = book,
                 file = file,
+                loadingFile = loadingFile,
                 showPathDialog = showPathDialog,
                 dismissBottomSheet = dismissBottomSheet
             )

app/src/main/java/ua/acclorite/book_story/ui/book_info/BookInfoContent.kt

@@ -19,6 +19,7 @@ import ua.acclorite.book_story.presentation.book_info.BookInfoEvent
 fun BookInfoContent(
     book: Book,
     file: File?,
+    loadingFile: Boolean,
     categories: List<Category>,
     bottomSheet: BottomSheet?,
     dialog: Dialog?,
@@ -66,6 +67,7 @@ fun BookInfoContent(
         bottomSheet = bottomSheet,
         book = book,
         file = file,
+        loadingFile = loadingFile,
         showPathDialog = showPathDialog,
         canResetCover = canResetCover,
         changeCover = changeCover,

app/src/main/java/ua/acclorite/book_story/ui/book_info/BookInfoDetailsBottomSheet.kt

@@ -32,6 +32,7 @@ import java.util.Locale
 fun BookInfoDetailsBottomSheet(
     book: Book,
     file: File?,
+    loadingFile: Boolean,
     showPathDialog: (BookInfoEvent.OnShowPathDialog) -> Unit,
     dismissBottomSheet: (BookInfoEvent.OnDismissBottomSheet) -> Unit
 ) {
@@ -53,6 +54,7 @@ fun BookInfoDetailsBottomSheet(
 
     val fileExists = remember(file) {
         file.let { file ->
+            if (loadingFile) return@let true
             if (file == null) return@let false
             if (file.isDirectory) return@let false
             if (
@@ -99,7 +101,8 @@ fun BookInfoDetailsBottomSheet(
                         showPathDialog(BookInfoEvent.OnShowPathDialog)
                     },
                     showError = !fileExists,
-                    errorMessage = stringResource(id = R.string.error_no_file)
+                    errorMessage = stringResource(id = R.string.error_no_file),
+                    loading = loadingFile
                 )
             }
 

app/src/main/java/ua/acclorite/book_story/ui/book_info/BookInfoDetailsBottomSheetItem.kt

@@ -8,6 +8,7 @@ package ua.acclorite.book_story.ui.book_info
 
 import androidx.compose.foundation.focusable
 import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxWidth
@@ -15,6 +16,7 @@ import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.EditNote
+import androidx.compose.material3.CircularProgressIndicator
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.runtime.Composable
@@ -25,6 +27,7 @@ import ua.acclorite.book_story.R
 import ua.acclorite.book_story.ui.common.components.common.IconButton
 import ua.acclorite.book_story.ui.common.components.common.StyledText
 import ua.acclorite.book_story.ui.theme.ExpandingTransition
+import ua.acclorite.book_story.ui.theme.FadeTransitionPreservingSpace
 
 @Composable
 fun BookInfoDetailsBottomSheetItem(
@@ -33,6 +36,7 @@ fun BookInfoDetailsBottomSheetItem(
     editable: Boolean,
     showError: Boolean = false,
     errorMessage: String? = null,
+    loading: Boolean = false,
     onEdit: () -> Unit = {}
 ) {
     Column(
@@ -55,10 +59,14 @@ fun BookInfoDetailsBottomSheetItem(
                 isError = showError,
                 label = {
                     StyledText(label)
-                }
+                },
             )
 
-            if (editable) {
+            Box(contentAlignment = Alignment.Center) {
+                FadeTransitionPreservingSpace(visible = loading) {
+                    CircularProgressIndicator(modifier = Modifier.size(24.dp), strokeWidth = 3.2.dp)
+                }
+                FadeTransitionPreservingSpace(visible = !loading && editable) {
                     IconButton(
                         icon = Icons.Default.EditNote,
                         contentDescription = R.string.edit_content_desc,
@@ -70,6 +78,7 @@ fun BookInfoDetailsBottomSheetItem(
                     }
                 }
             }
+        }
 
         ExpandingTransition(showError && !errorMessage.isNullOrBlank()) {
             StyledText(