Branch selection in chapters list

app/src/main/kotlin/org/koitharu/kotatsu/core/model/QuickFilter.kt

@@ -0,0 +1,13 @@
+package org.koitharu.kotatsu.core.model
+
+import org.koitharu.kotatsu.core.ui.widgets.ChipsView
+import org.koitharu.kotatsu.list.domain.ListFilterOption
+
+fun ListFilterOption.toChipModel(isChecked: Boolean) = ChipsView.ChipModel(
+	title = titleText,
+	titleResId = titleResId,
+	icon = iconResId,
+	iconData = getIconData(),
+	isChecked = isChecked,
+	data = this,
+)

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

@@ -0,0 +1,35 @@
+package org.koitharu.kotatsu.core.util
+
+import androidx.core.os.LocaleListCompat
+import org.koitharu.kotatsu.core.util.ext.iterator
+
+class LocaleStringComparator : Comparator<String?> {
+
+	private val deviceLocales: List<String?>
+
+	init {
+		val localeList = LocaleListCompat.getAdjustedDefault()
+		deviceLocales = buildList(localeList.size() + 1) {
+			add(null)
+			val set = HashSet<String?>(localeList.size() + 1)
+			set.add(null)
+			for (locale in localeList) {
+				val lang = locale.getDisplayLanguage(locale).lowercase()
+				if (set.add(lang)) {
+					add(lang)
+				}
+			}
+		}
+	}
+
+	override fun compare(a: String?, b: String?): Int {
+		val indexA = deviceLocales.indexOf(a?.lowercase())
+		val indexB = deviceLocales.indexOf(b?.lowercase())
+		return when {
+			indexA < 0 && indexB < 0 -> compareValues(a, b)
+			indexA < 0 -> 1
+			indexB < 0 -> -1
+			else -> compareValues(indexA, indexB)
+		}
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/details/domain/BranchComparator.kt

@@ -1,8 +1,11 @@
 package org.koitharu.kotatsu.details.domain
 
+import org.koitharu.kotatsu.core.util.LocaleStringComparator
 import org.koitharu.kotatsu.details.ui.model.MangaBranch
 
 class BranchComparator : Comparator<MangaBranch> {
 
-	override fun compare(o1: MangaBranch, o2: MangaBranch): Int = compareValues(o1.name, o2.name)
+	private val delegate = LocaleStringComparator()
+
+	override fun compare(o1: MangaBranch, o2: MangaBranch): Int = delegate.compare(o1.name, o2.name)
 }

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

@@ -67,7 +67,7 @@ fun MangaDetails.mapChapters(
 	return result
 }
 
-fun List<ChapterListItem>.withVolumeHeaders(context: Context): List<ListModel> {
+fun List<ChapterListItem>.withVolumeHeaders(context: Context): MutableList<ListModel> {
 	var prevVolume = 0
 	val result = ArrayList<ListModel>((size * 1.4).toInt())
 	for (item in this) {

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

@@ -42,6 +42,7 @@ import coil3.size.Precision
 import coil3.size.Scale
 import coil3.transform.RoundedCornersTransformation
 import coil3.util.CoilUtils
+import com.google.android.material.bottomsheet.BottomSheetBehavior
 import com.google.android.material.chip.Chip
 import com.google.android.material.snackbar.Snackbar
 import dagger.hilt.android.AndroidEntryPoint
@@ -167,6 +168,7 @@ class DetailsActivity :
 		TitleScrollCoordinator(viewBinding.textViewTitle).attach(viewBinding.scrollView)
 		viewBinding.containerBottomSheet?.let { sheet ->
 			onBackPressedDispatcher.addCallback(BottomSheetCollapseCallback(sheet))
+			BottomSheetBehavior.from(sheet).addBottomSheetCallback(DetailsBottomSheetCallback(viewBinding.swipeRefreshLayout))
 		}
 		TitleExpandListener(viewBinding.textViewTitle).attach()
 

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

@@ -0,0 +1,16 @@
+package org.koitharu.kotatsu.details.ui
+
+import android.view.View
+import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
+import com.google.android.material.bottomsheet.BottomSheetBehavior
+
+class DetailsBottomSheetCallback(
+	private val swipeRefreshLayout: SwipeRefreshLayout,
+) : BottomSheetBehavior.BottomSheetCallback() {
+
+	override fun onStateChanged(bottomSheet: View, newState: Int) {
+		swipeRefreshLayout.isEnabled = newState == BottomSheetBehavior.STATE_COLLAPSED
+	}
+
+	override fun onSlide(bottomSheet: View, slideOffset: Float) = Unit
+}

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

@@ -19,14 +19,17 @@ import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.plus
 import okio.FileNotFoundException
 import org.koitharu.kotatsu.bookmarks.domain.BookmarksRepository
+import org.koitharu.kotatsu.core.model.toChipModel
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.observeAsStateFlow
 import org.koitharu.kotatsu.core.ui.BaseViewModel
 import org.koitharu.kotatsu.core.ui.util.ReversibleAction
+import org.koitharu.kotatsu.core.util.LocaleStringComparator
 import org.koitharu.kotatsu.core.util.ext.MutableEventFlow
 import org.koitharu.kotatsu.core.util.ext.call
 import org.koitharu.kotatsu.core.util.ext.combine
 import org.koitharu.kotatsu.core.util.ext.requireValue
+import org.koitharu.kotatsu.core.util.ext.sortedWithSafe
 import org.koitharu.kotatsu.details.data.MangaDetails
 import org.koitharu.kotatsu.details.domain.DetailsInteractor
 import org.koitharu.kotatsu.details.ui.DetailsActivity
@@ -36,6 +39,7 @@ import org.koitharu.kotatsu.details.ui.model.ChapterListItem
 import org.koitharu.kotatsu.download.ui.worker.DownloadTask
 import org.koitharu.kotatsu.download.ui.worker.DownloadWorker
 import org.koitharu.kotatsu.history.data.HistoryRepository
+import org.koitharu.kotatsu.list.domain.ListFilterOption
 import org.koitharu.kotatsu.local.domain.DeleteLocalMangaUseCase
 import org.koitharu.kotatsu.local.domain.model.LocalManga
 import org.koitharu.kotatsu.parsers.model.Manga
@@ -119,6 +123,18 @@ abstract class ChaptersPagesViewModel(
 		(if (reversed) list.asReversed() else list).filterSearch(query)
 	}.stateIn(viewModelScope + Dispatchers.Default, SharingStarted.Eagerly, emptyList())
 
+	val quickFilter = combine(
+		mangaDetails,
+		selectedBranch,
+	) { details, branch ->
+		val branches = details?.chapters?.keys?.sortedWithSafe(LocaleStringComparator()).orEmpty()
+		if (branches.size > 1) {
+			branches.map { ListFilterOption.Branch(it).toChipModel(it == branch) }
+		} else {
+			emptyList()
+		}
+	}
+
 	init {
 		launchJob(Dispatchers.Default) {
 			localStorageChanges

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

@@ -6,10 +6,12 @@ import android.view.View
 import android.view.ViewGroup
 import androidx.core.graphics.Insets
 import androidx.core.view.ancestors
+import androidx.core.view.isGone
 import androidx.core.view.isVisible
 import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.viewpager2.widget.ViewPager2
+import com.google.android.material.chip.Chip
 import dagger.hilt.android.AndroidEntryPoint
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.firstOrNull
@@ -22,6 +24,7 @@ import org.koitharu.kotatsu.core.ui.dialog.CommonAlertDialogs
 import org.koitharu.kotatsu.core.ui.list.ListSelectionController
 import org.koitharu.kotatsu.core.ui.list.OnListItemClickListener
 import org.koitharu.kotatsu.core.ui.util.PagerNestedScrollHelper
+import org.koitharu.kotatsu.core.ui.widgets.ChipsView
 import org.koitharu.kotatsu.core.util.RecyclerViewScrollCallback
 import org.koitharu.kotatsu.core.util.ext.dismissParentDialog
 import org.koitharu.kotatsu.core.util.ext.findAppCompatDelegate
@@ -34,6 +37,7 @@ import org.koitharu.kotatsu.details.ui.adapter.ChaptersSelectionDecoration
 import org.koitharu.kotatsu.details.ui.model.ChapterListItem
 import org.koitharu.kotatsu.details.ui.pager.ChaptersPagesViewModel
 import org.koitharu.kotatsu.details.ui.withVolumeHeaders
+import org.koitharu.kotatsu.list.domain.ListFilterOption
 import org.koitharu.kotatsu.list.ui.adapter.TypedListSpacingDecoration
 import org.koitharu.kotatsu.list.ui.model.ListModel
 import org.koitharu.kotatsu.reader.ui.ReaderActivity.IntentBuilder
@@ -45,7 +49,7 @@ import kotlin.math.roundToInt
 @AndroidEntryPoint
 class ChaptersFragment :
 	BaseFragment<FragmentChaptersBinding>(),
-	OnListItemClickListener<ChapterListItem> {
+	OnListItemClickListener<ChapterListItem>, ChipsView.OnChipClickListener {
 
 	private val viewModel by ChaptersPagesViewModel.ActivityVMLazy(this)
 
@@ -86,11 +90,13 @@ class ChaptersFragment :
 			adapter = chaptersAdapter
 			ChapterGridSpanHelper.attach(this)
 		}
+		binding.chipsFilter.onChipClickListener = this
 		viewModel.isLoading.observe(viewLifecycleOwner, this::onLoadingStateChanged)
 		viewModel.chapters
 			.map { it.withVolumeHeaders(requireContext()) }
 			.flowOn(Dispatchers.Default)
 			.observe(viewLifecycleOwner, this::onChaptersChanged)
+		viewModel.quickFilter.observe(viewLifecycleOwner, this::onFilterChanged)
 		viewModel.isChaptersEmpty.observe(viewLifecycleOwner) {
 			binding.textViewHolder.isVisible = it
 		}
@@ -128,6 +134,11 @@ class ChaptersFragment :
 		return selectionController?.onItemContextClick(view, item.chapter.id) ?: false
 	}
 
+	override fun onChipClick(chip: Chip, data: Any?) {
+		if (data !is ListFilterOption.Branch) return
+		viewModel.setSelectedBranch(data.titleText)
+	}
+
 	override fun onWindowInsetsChanged(insets: Insets) = Unit
 
 	private fun onChaptersChanged(list: List<ListModel>) {
@@ -148,6 +159,13 @@ class ChaptersFragment :
 		}
 	}
 
+	private fun onFilterChanged(list: List<ChipsView.ChipModel>) {
+		viewBinding?.chipsFilter?.run {
+			setChips(list)
+			isGone = list.isEmpty()
+		}
+	}
+
 	private suspend fun onSelectChapter(chapterId: Long) {
 		if (!isResumed) {
 			view?.ancestors?.firstNotNullOfOrNull { it as? ViewPager2 }?.setCurrentItem(0, true)

app/src/main/kotlin/org/koitharu/kotatsu/list/domain/ListFilterOption.kt

@@ -60,6 +60,20 @@ sealed interface ListFilterOption {
 			get() = name
 	}
 
+	data class Branch(
+		override val titleText: String?,
+	) : ListFilterOption {
+
+		override val titleResId: Int
+			get() = if (titleText == null) R.string.system_default else 0
+
+		override val iconResId: Int
+			get() = R.drawable.ic_language
+
+		override val groupKey: String
+			get() = "_branch"
+	}
+
 	data class Tag(
 		val tag: MangaTag
 	) : ListFilterOption {

app/src/main/kotlin/org/koitharu/kotatsu/list/domain/MangaListQuickFilter.kt

@@ -3,8 +3,8 @@ package org.koitharu.kotatsu.list.domain
 import androidx.collection.ArraySet
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
+import org.koitharu.kotatsu.core.model.toChipModel
 import org.koitharu.kotatsu.core.prefs.AppSettings
-import org.koitharu.kotatsu.core.ui.widgets.ChipsView
 import org.koitharu.kotatsu.list.ui.model.QuickFilter
 import org.koitharu.kotatsu.parsers.util.suspendlazy.getOrNull
 import org.koitharu.kotatsu.parsers.util.suspendlazy.suspendLazy
@@ -52,14 +52,7 @@ abstract class MangaListQuickFilter(
 			return null
 		}
 		val availableOptions = availableFilterOptions.getOrNull()?.map { option ->
-			ChipsView.ChipModel(
-				title = option.titleText,
-				titleResId = option.titleResId,
-				icon = option.iconResId,
-				iconData = option.getIconData(),
-				isChecked = option in selectedOptions,
-				data = option,
-			)
+			option.toChipModel(isChecked = option in selectedOptions)
 		}.orEmpty()
 		return if (availableOptions.isNotEmpty()) {
 			QuickFilter(availableOptions)

app/src/main/res/layout/fragment_chapters.xml

@@ -1,15 +1,44 @@
 <?xml version="1.0" encoding="utf-8"?>
-<FrameLayout
+<RelativeLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
 	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="match_parent">
 
+	<HorizontalScrollView
+		android:id="@+id/scrollView_filter"
+		android:layout_width="0dp"
+		android:layout_height="wrap_content"
+		android:layout_alignParentStart="true"
+		android:layout_alignParentEnd="true"
+		android:clipChildren="false"
+		android:clipToPadding="false"
+		android:paddingHorizontal="@dimen/list_spacing"
+		android:scrollbars="none">
+
+		<org.koitharu.kotatsu.core.ui.widgets.ChipsView
+			android:id="@+id/chips_filter"
+			android:layout_width="wrap_content"
+			android:layout_height="wrap_content"
+			android:clipChildren="false"
+			android:clipToPadding="false"
+			android:paddingTop="2dp"
+			android:paddingBottom="6dp"
+			app:chipStyle="@style/Widget.Kotatsu.Chip.Filter"
+			app:singleLine="true" />
+
+	</HorizontalScrollView>
+
 	<org.koitharu.kotatsu.core.ui.list.fastscroll.FastScrollRecyclerView
 		android:id="@+id/recyclerView_chapters"
-		android:layout_width="match_parent"
-		android:layout_height="match_parent"
+		android:layout_width="0dp"
+		android:layout_height="0dp"
+		android:layout_alignWithParentIfMissing="true"
+		android:layout_below="@id/scrollView_filter"
+		android:layout_alignParentStart="true"
+		android:layout_alignParentEnd="true"
+		android:layout_alignParentBottom="true"
 		android:clipToPadding="false"
 		android:orientation="vertical"
 		android:scrollIndicators="top"
@@ -21,7 +50,7 @@
 		android:id="@+id/progressBar"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_gravity="center"
+		android:layout_centerInParent="true"
 		android:indeterminate="true"
 		android:visibility="gone"
 		tools:visibility="visible" />
@@ -30,7 +59,7 @@
 		android:id="@+id/textView_holder"
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:layout_gravity="center"
+		android:layout_centerInParent="true"
 		android:layout_marginStart="@dimen/margin_normal"
 		android:layout_marginTop="@dimen/margin_normal"
 		android:layout_marginEnd="@dimen/margin_normal"
@@ -42,4 +71,4 @@
 		android:visibility="gone"
 		tools:visibility="visible" />
 
-</FrameLayout>
+</RelativeLayout>