Fix reader

app/src/main/java/org/koitharu/kotatsu/ui/reader/BaseReaderFragment.kt

@@ -69,7 +69,6 @@ abstract class BaseReaderFragment(@LayoutRes contentLayoutId: Int) : BaseFragmen
 	}
 
 	fun findCurrentPageIndex(chapterId: Long): Int {
-		val pages = this.pages
 		var offset = 0
 		for ((id, count) in chaptersMap) {
 			if (id == chapterId) {
@@ -80,6 +79,17 @@ abstract class BaseReaderFragment(@LayoutRes contentLayoutId: Int) : BaseFragmen
 		return -1
 	}
 
+	fun findChapterOffset(chapterId: Long): Int {
+		var offset = 0
+		for ((id, count) in chaptersMap) {
+			if (id == chapterId) {
+				return offset
+			}
+			offset += count
+		}
+		return -1
+	}
+
 	fun getPages(chapterId: Long): List<MangaPage>? {
 		var offset = 0
 		for ((id, count) in chaptersMap) {
@@ -113,13 +123,12 @@ abstract class BaseReaderFragment(@LayoutRes contentLayoutId: Int) : BaseFragmen
 		}
 	}
 
-
 	protected fun notifyPageChanged(page: Int) {
 		var i = page
 		val chapters = lastState?.manga?.chapters ?: return
 		val chapter = chaptersMap.firstOrNull { x ->
 			i -= x.second
-			i <= 0
+			i < 0
 		} ?: return
 		(activity as? ReaderListener)?.onPageChanged(
 			chapter = chapters.find { x -> x.id == chapter.first } ?: return,

app/src/main/java/org/koitharu/kotatsu/ui/reader/ReaderPresenter.kt

@@ -1,11 +1,9 @@
 package org.koitharu.kotatsu.ui.reader
 
 import android.content.ContentResolver
+import android.util.Log
 import android.webkit.URLUtil
-import kotlinx.coroutines.CancellationException
-import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
+import kotlinx.coroutines.*
 import moxy.InjectViewState
 import moxy.presenterScope
 import okhttp3.OkHttpClient
@@ -27,10 +25,12 @@ import org.koitharu.kotatsu.utils.ext.mimeType
 @InjectViewState
 class ReaderPresenter : BasePresenter<ReaderView>() {
 
+	private var loaderJob: Job? = null
 	private var isInitialized = false
 
 	fun loadChapter(manga: Manga, chapterId: Long, action: ReaderAction) {
-		presenterScope.launch {
+		loaderJob?.cancel()
+		loaderJob = presenterScope.launch {
 			viewState.onLoadingStateChanged(isLoading = true)
 			try {
 				withContext(Dispatchers.IO) {
@@ -63,6 +63,8 @@ class ReaderPresenter : BasePresenter<ReaderView>() {
 						viewState.onPagesLoaded(chapterId, pages, action)
 					}
 				}
+			} catch (e: CancellationException){
+				Log.w(null, "Loader job cancelled", e)
 			} catch (e: Exception) {
 				if (BuildConfig.DEBUG) {
 					e.printStackTrace()

app/src/main/java/org/koitharu/kotatsu/ui/reader/standard/StandardReaderFragment.kt

@@ -44,7 +44,7 @@ class StandardReaderFragment : BaseReaderFragment(R.layout.fragment_reader_stand
 				it.replaceData(pages)
 				lastState?.let { state ->
 					if (chapterId == state.chapterId) {
-						pager.setCurrentItem(state.page, false)
+						pager.setCurrentItem(findChapterOffset(chapterId) + state.page, false)
 					}
 				}
 			}