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Epub improvements (#160)

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* Improved navigation and search result highlighting in the EPUB reader

* refactor: implement JIT chunk restoration for robust navigation

- Fixes search and bookmark navigation failing in same-chapter transitions.
- Introduced JIT (Just-in-Time) HTML restoration in `epub_reader.js` to
  re-populate virtualized chunks before CFI resolution or search scrolling.
- Synchronized search highlighting and user highlights within
  newly-restored chunk segments.
- Improved search navigation accuracy by mapping occurrences to
  relative chunk indices.

* Implemented a custom text selection engine for the paginated EPUB reader to support cross-page selection and improved handle interaction.

* Implemented management of external file behavior and improved library filtering.

* Added support for toolbar customization in the EPUB reader.

* Added support for toolbar customization in the PDF reader.

* fix: rendering during auto-scroll and navigation on long pages

* Added a "Scroll to Top" feature to the auto-scroll controls in both EPUB and PDF readers.
This commit is contained in:
Aryan 2026-04-10 17:30:48 +05:30 • committed by GitHub
parent db7e05ce63
commit 6a60aec0ef
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GPG key ID: B5690EEEBB952194
17 changed files with 3045 additions and 2060 deletions
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21
app/src/main/java/com/aryan/reader/epubreader/ChapterWebView.kt
View file

@ -577,6 +577,11 @@ fun ChapterWebView(
)
}
message.startsWith("NavDiag:") -> {
Timber.tag("NavDiag")
.d("JS -> ${message.substringAfter("NavDiag: ")}")
}
message.startsWith("AutoScrollDiagnosis") -> {
Timber.d(
"JS -> ${message.substringAfter("AutoScrollDiagnosis: ")}"
@ -726,13 +731,13 @@ fun ChapterWebView(
if (!initialCfi.isNullOrBlank()) {
val cfiJsCommand = "javascript:window.scrollToCfi('$initialCfi');"
Timber.tag("POS_DIAG").d("WebView onPageFinished: Triggering scroll to initialCfi: $initialCfi")
Timber.tag("NavDiag").d("WebView onPageFinished: Triggering scroll to initialCfi: $initialCfi")
view?.evaluateJavascript(cfiJsCommand) {
onChapterInitiallyScrolled()
scrollActionTaken = true
}
} else if (!initialFragmentId.isNullOrBlank()) {
Timber.d("WebView onPageFinished: Scrolling to Element ID: $initialFragmentId")
Timber.tag("NavDiag").d("WebView onPageFinished: Scrolling to Element ID: $initialFragmentId")
view?.evaluateJavascript(
"javascript:var el = document.getElementById('$initialFragmentId'); if(el) { el.scrollIntoView(); } else { console.log('Element not found: $initialFragmentId'); }",
null
@ -744,9 +749,7 @@ fun ChapterWebView(
ChapterScrollPosition.END -> "javascript:window.scrollToChapterEnd();"
else -> "javascript:window.scrollToChapterStart();"
}
Timber.d(
"WebView onPageFinished: Executing initial scroll to target: $initialScrollTarget"
)
Timber.tag("NavDiag").d("WebView onPageFinished: Executing initial scroll to target: $initialScrollTarget")
view?.evaluateJavascript(scrollJsCommand) {
onChapterInitiallyScrolled()
scrollActionTaken = true
@ -754,17 +757,13 @@ fun ChapterWebView(
} else if (initialPageScrollY != null && initialPageScrollY > 0) {
val scrollJsCommand =
"javascript:window.scrollToSpecificY($initialPageScrollY);"
Timber.d(
"WebView onPageFinished: Executing initial scroll to Y: $initialPageScrollY"
)
Timber.tag("NavDiag").d("WebView onPageFinished: Executing initial scroll to Y: $initialPageScrollY")
view?.evaluateJavascript(scrollJsCommand) {
onChapterInitiallyScrolled()
scrollActionTaken = true
}
} else {
Timber.d(
"WebView onPageFinished: No specific scroll, defaulting to start."
)
Timber.tag("NavDiag").d("WebView onPageFinished: No specific scroll, defaulting to start.")
view?.evaluateJavascript("javascript:window.scrollToChapterStart();") {
onChapterInitiallyScrolled()
scrollActionTaken = true