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@ -70,14 +70,7 @@ abstract class PagerViewer(val activity: ReaderActivity) : BaseViewer {
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pager.adapter = adapter
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pager.addOnPageChangeListener(object : ViewPager.SimpleOnPageChangeListener() {
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override fun onPageSelected(position: Int) {
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val page = adapter.items.getOrNull(position)
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if (page != null && currentPage != page) {
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currentPage = page
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when (page) {
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is ReaderPage -> onPageSelected(page, position)
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is ChapterTransition -> onTransitionSelected(page)
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}
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}
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onPageChange(position)
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}
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override fun onPageScrollStateChanged(state: Int) {
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@ -129,25 +122,38 @@ abstract class PagerViewer(val activity: ReaderActivity) : BaseViewer {
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}
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/**
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* Called from the ViewPager listener when a [page] is marked as active. It notifies the
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* Called when a new page (either a [ReaderPage] or [ChapterTransition]) is marked as active
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*/
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private fun onPageChange(position: Int) {
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val page = adapter.items.getOrNull(position)
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if (page != null && currentPage != page) {
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currentPage = page
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when (page) {
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is ReaderPage -> onReaderPageSelected(page)
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is ChapterTransition -> onTransitionSelected(page)
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}
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}
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}
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/**
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* Called when a [ReaderPage] is marked as active. It notifies the
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* activity of the change and requests the preload of the next chapter if this is the last page.
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*/
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private fun onPageSelected(page: ReaderPage, position: Int) {
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private fun onReaderPageSelected(page: ReaderPage) {
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val pages = page.chapter.pages!! // Won't be null because it's the loaded chapter
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Timber.d("onPageSelected: ${page.number}/${pages.size}")
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Timber.d("onReaderPageSelected: ${page.number}/${pages.size}")
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activity.onPageSelected(page)
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if (page === pages.last()) {
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Timber.d("Request preload next chapter because we're at the last page")
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val transition = adapter.items.getOrNull(position + 1) as? ChapterTransition.Next
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if (transition?.to != null) {
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activity.requestPreloadChapter(transition.to)
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adapter.nextTransition?.to?.let {
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activity.requestPreloadChapter(it)
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}
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}
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}
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/**
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* Called from the ViewPager listener when a [transition] is marked as active. It request the
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* Called when a [ChapterTransition] is marked as active. It request the
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* preload of the destination chapter of the transition.
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*/
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private fun onTransitionSelected(transition: ChapterTransition) {
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@ -194,10 +200,15 @@ abstract class PagerViewer(val activity: ReaderActivity) : BaseViewer {
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* Tells this viewer to move to the given [page].
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*/
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override fun moveToPage(page: ReaderPage) {
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Timber.d("moveToPage")
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Timber.d("moveToPage ${page.number}")
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val position = adapter.items.indexOf(page)
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if (position != -1) {
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val currentPosition = pager.currentItem
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pager.setCurrentItem(position, true)
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// manually call onPageChange since ViewPager listener is not triggered in this case
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if (currentPosition == position) {
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onPageChange(position)
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}
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} else {
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Timber.d("Page $page not found in adapter")
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}
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