Option to show only downloaded chapters

app/src/main/kotlin/org/koitharu/kotatsu/core/util/ext/Flow.kt

@@ -21,7 +21,6 @@ import kotlinx.coroutines.flow.transform
 import kotlinx.coroutines.flow.transformLatest
 import kotlinx.coroutines.flow.transformWhile
 import kotlinx.coroutines.flow.update
-import kotlinx.coroutines.withTimeout
 import org.koitharu.kotatsu.parsers.util.runCatchingCancellable
 import org.koitharu.kotatsu.parsers.util.suspendlazy.SuspendLazy
 import java.util.concurrent.TimeUnit
@@ -135,6 +134,28 @@ fun <T1, T2, T3, T4, T5, T6, R> combine(
 	)
 }
 
+@Suppress("UNCHECKED_CAST")
+fun <T1, T2, T3, T4, T5, T6, T7, R> combine(
+	flow: Flow<T1>,
+	flow2: Flow<T2>,
+	flow3: Flow<T3>,
+	flow4: Flow<T4>,
+	flow5: Flow<T5>,
+	flow6: Flow<T6>,
+	flow7: Flow<T7>,
+	transform: suspend (T1, T2, T3, T4, T5, T6, T7) -> R,
+): Flow<R> = combine(flow, flow2, flow3, flow4, flow5, flow6, flow7) { args: Array<*> ->
+	transform(
+		args[0] as T1,
+		args[1] as T2,
+		args[2] as T3,
+		args[3] as T4,
+		args[4] as T5,
+		args[5] as T6,
+		args[6] as T7,
+	)
+}
+
 suspend fun <T : Any> Flow<T?>.firstNotNull(): T = checkNotNull(first { x -> x != null })
 
 suspend fun <T : Any> Flow<T?>.firstNotNullOrNull(): T? = firstOrNull { x -> x != null }

app/src/main/kotlin/org/koitharu/kotatsu/details/data/MangaDetails.kt

@@ -17,7 +17,6 @@ data class MangaDetails(
 	private val localManga: LocalManga?,
 	private val override: MangaOverride?,
 	val description: CharSequence?,
-	@Deprecated("Caller should decide if manga is loaded enough by itself")
 	val isLoaded: Boolean,
 ) {
 

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/ChaptersMapper.kt

@@ -16,6 +16,7 @@ fun MangaDetails.mapChapters(
 	branch: String?,
 	bookmarks: List<Bookmark>,
 	isGrid: Boolean,
+	isDownloadedOnly: Boolean,
 ): List<ChapterListItem> {
 	val remoteChapters = chapters[branch].orEmpty()
 	val localChapters = local?.manga?.getChapters(branch).orEmpty()
@@ -35,6 +36,7 @@ fun MangaDetails.mapChapters(
 		null
 	}
 	var isUnread = currentChapterId !in ids
+	if (!isDownloadedOnly || local?.manga?.chapters == null) {
 		for (chapter in remoteChapters) {
 			val local = localMap?.remove(chapter.id)
 			if (chapter.id == currentChapterId) {
@@ -49,6 +51,7 @@ fun MangaDetails.mapChapters(
 				isGrid = isGrid,
 			)
 		}
+	}
 	if (!localMap.isNullOrEmpty()) {
 		for (chapter in localMap.values) {
 			if (chapter.id == currentChapterId) {

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/pager/ChapterPagesMenuProvider.kt

@@ -9,6 +9,7 @@ import androidx.core.view.MenuProvider
 import androidx.viewpager2.widget.ViewPager2
 import com.google.android.material.slider.LabelFormatter
 import com.google.android.material.slider.Slider
+import com.google.android.material.slider.TickVisibilityMode
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.ui.sheet.BaseAdaptiveSheet
@@ -41,6 +42,10 @@ class ChapterPagesMenuProvider(
 				menu.findItem(R.id.action_search)?.isVisible = viewModel.isChaptersEmpty.value == false
 				menu.findItem(R.id.action_reversed)?.isChecked = viewModel.isChaptersReversed.value == true
 				menu.findItem(R.id.action_grid_view)?.isChecked = viewModel.isChaptersInGridView.value == true
+				menu.findItem(R.id.action_downloaded)?.let { menuItem ->
+					menuItem.isVisible = viewModel.mangaDetails.value?.local != null
+					menuItem.isChecked = viewModel.isDownloadedOnly.value == true
+				}
 			}
 
 			TAB_PAGES, TAB_BOOKMARKS -> {
@@ -64,6 +69,11 @@ class ChapterPagesMenuProvider(
 			true
 		}
 
+		R.id.action_downloaded -> {
+			viewModel.isDownloadedOnly.value = !menuItem.isChecked
+			true
+		}
+
 		else -> false
 	}
 
@@ -110,7 +120,7 @@ class ChapterPagesMenuProvider(
 		valueFrom = 50f
 		valueTo = 150f
 		stepSize = 5f
-		isTickVisible = false
+		tickVisibilityMode = TickVisibilityMode.TICK_VISIBILITY_HIDDEN
 		labelBehavior = LabelFormatter.LABEL_FLOATING
 		setLabelFormatter(IntPercentLabelFormatter(context))
 		setValueRounded(settings.gridSizePages.toFloat())

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/pager/ChaptersPagesSheet.kt

@@ -81,6 +81,7 @@ class ChaptersPagesSheet : BaseAdaptiveSheet<SheetChaptersPagesBinding>(),
 		val menuInvalidator = MenuInvalidator(binding.toolbar)
 		viewModel.isChaptersReversed.observe(viewLifecycleOwner, menuInvalidator)
 		viewModel.isChaptersInGridView.observe(viewLifecycleOwner, menuInvalidator)
+		viewModel.isDownloadedOnly.observe(viewLifecycleOwner, menuInvalidator)
 
 		actionModeDelegate?.addListener(this, viewLifecycleOwner)
 		addSheetCallback(this, viewLifecycleOwner)

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/pager/ChaptersPagesViewModel.kt

@@ -87,6 +87,8 @@ abstract class ChaptersPagesViewModel(
 		valueProducer = { isChaptersGridView },
 	)
 
+	val isDownloadedOnly = MutableStateFlow(false)
+
 	val newChaptersCount = mangaDetails.flatMapLatest { d ->
 		if (d?.isLocal == false) {
 			interactor.observeNewChapters(d.id)
@@ -115,13 +117,15 @@ abstract class ChaptersPagesViewModel(
 			newChaptersCount,
 			bookmarks,
 			isChaptersInGridView,
-		) { manga, currentChapterId, branch, news, bookmarks, grid ->
+			isDownloadedOnly,
+		) { manga, currentChapterId, branch, news, bookmarks, grid, downloadedOnly ->
 			manga?.mapChapters(
-				currentChapterId,
-				news,
-				branch,
-				bookmarks,
-				grid,
+				currentChapterId = currentChapterId,
+				newCount = news,
+				branch = branch,
+				bookmarks = bookmarks,
+				isGrid = grid,
+				isDownloadedOnly = downloadedOnly,
 			).orEmpty()
 		},
 		isChaptersReversed,

app/src/main/res/menu/opt_chapters.xml

@@ -11,6 +11,13 @@
 		app:actionViewClass="androidx.appcompat.widget.SearchView"
 		app:showAsAction="ifRoom|collapseActionView" />
 
+	<item
+		android:id="@+id/action_downloaded"
+		android:checkable="true"
+		android:orderInCategory="18"
+		android:title="@string/on_device"
+		app:showAsAction="never" />
+
 	<item
 		android:id="@+id/action_reversed"
 		android:checkable="true"