Improve pages preview on details screen

app/build.gradle

@@ -82,7 +82,7 @@ afterEvaluate {
 }
 dependencies {
 	//noinspection GradleDependency
-	implementation('com.github.KotatsuApp:kotatsu-parsers:7c89f53988') {
+	implementation('com.github.KotatsuApp:kotatsu-parsers:3feb84ac9e') {
 		exclude group: 'org.json', module: 'json'
 	}
 

app/src/main/kotlin/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -204,6 +204,9 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 	val isUnstableUpdatesAllowed: Boolean
 		get() = prefs.getBoolean(KEY_UPDATES_UNSTABLE, false)
 
+	val defaultDetailsTab: Int
+		get() = prefs.getString(KEY_DETAILS_TAB, null)?.toIntOrNull()?.coerceIn(0, 1) ?: 0
+
 	val isContentPrefetchEnabled: Boolean
 		get() {
 			if (isBackgroundNetworkRestricted()) {
@@ -559,6 +562,7 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_CF_INVERTED = "cf_inverted"
 		const val KEY_CF_GRAYSCALE = "cf_grayscale"
 		const val KEY_IGNORE_DOZE = "ignore_dose"
+		const val KEY_DETAILS_TAB = "details_tab"
 
 		// About
 		const val KEY_APP_UPDATE = "app_update"

app/src/main/kotlin/org/koitharu/kotatsu/core/ui/list/BoundsScrollListener.kt

@@ -38,4 +38,12 @@ abstract class BoundsScrollListener(
 		firstVisibleItemPosition: Int,
 		visibleItemCount: Int
 	) = Unit
+
+	fun invalidate(recyclerView: RecyclerView) {
+		onScrolled(recyclerView, 0, 0)
+	}
+
+	fun postInvalidate(recyclerView: RecyclerView) = recyclerView.post {
+		invalidate(recyclerView)
+	}
 }

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

@@ -1,6 +1,5 @@
 package org.koitharu.kotatsu.details.ui
 
-import android.os.Build
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.Menu
@@ -57,9 +56,6 @@ class ChaptersFragment :
 			checkNotNull(selectionController).attachToRecyclerView(this)
 			setHasFixedSize(true)
 			adapter = chaptersAdapter
-			if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-				scrollIndicators = if (resources.getBoolean(R.bool.is_tablet)) 0 else View.SCROLL_INDICATOR_TOP
-			}
 		}
 		viewModel.isLoading.observe(viewLifecycleOwner, this::onLoadingStateChanged)
 		viewModel.chapters.observe(viewLifecycleOwner, this::onChaptersChanged)

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

@@ -27,7 +27,6 @@ import androidx.core.view.isVisible
 import androidx.core.view.updateLayoutParams
 import androidx.core.view.updatePadding
 import com.google.android.material.bottomsheet.BottomSheetBehavior
-import com.google.android.material.snackbar.BaseTransientBottomBar
 import com.google.android.material.snackbar.Snackbar
 import com.google.android.material.tabs.TabLayoutMediator
 import dagger.hilt.android.AndroidEntryPoint
@@ -38,8 +37,10 @@ import org.koitharu.kotatsu.core.exceptions.resolve.SnackbarErrorObserver
 import org.koitharu.kotatsu.core.model.parcelable.ParcelableManga
 import org.koitharu.kotatsu.core.os.AppShortcutManager
 import org.koitharu.kotatsu.core.parser.MangaIntent
+import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.ui.BaseActivity
 import org.koitharu.kotatsu.core.ui.util.MenuInvalidator
+import org.koitharu.kotatsu.core.ui.util.ReversibleActionObserver
 import org.koitharu.kotatsu.core.util.ext.doOnExpansionsChanged
 import org.koitharu.kotatsu.core.util.ext.getAnimationDuration
 import org.koitharu.kotatsu.core.util.ext.getThemeColor
@@ -77,6 +78,9 @@ class DetailsActivity :
 	@Inject
 	lateinit var appShortcutManager: AppShortcutManager
 
+	@Inject
+	lateinit var settings: AppSettings
+
 	private var buttonTip: WeakReference<ButtonTip>? = null
 
 	private val viewModel: DetailsViewModel by viewModels()
@@ -129,19 +133,16 @@ class DetailsActivity :
 				},
 			),
 		)
-		viewModel.onShowToast.observeEvent(this) {
-			makeSnackbar(getString(it), Snackbar.LENGTH_SHORT).show()
-		}
+		viewModel.onActionDone.observeEvent(this, ReversibleActionObserver(viewBinding.containerDetails))
 		viewModel.onShowTip.observeEvent(this) { showTip() }
 		viewModel.historyInfo.observe(this, ::onHistoryChanged)
 		viewModel.selectedBranch.observe(this) {
 			viewBinding.toolbarChapters?.subtitle = it
 			viewBinding.textViewSubtitle?.textAndVisible = it
 		}
-		viewModel.isChaptersReversed.observe(
-			this,
-			MenuInvalidator(viewBinding.toolbarChapters ?: this),
-		)
+		val chaptersMenuInvalidator = MenuInvalidator(viewBinding.toolbarChapters ?: this)
+		viewModel.isChaptersReversed.observe(this, chaptersMenuInvalidator)
+		viewModel.isChaptersEmpty.observe(this, chaptersMenuInvalidator)
 		val menuInvalidator = MenuInvalidator(this)
 		viewModel.favouriteCategories.observe(this, menuInvalidator)
 		viewModel.remoteManga.observe(this, menuInvalidator)
@@ -304,7 +305,7 @@ class DetailsActivity :
 			tab.removeBadge()
 		} else {
 			val badge = tab.orCreateBadge
-			badge.horizontalOffset = resources.getDimensionPixelOffset(R.dimen.margin_small)
+			badge.horizontalOffsetWithText = -resources.getDimensionPixelOffset(R.dimen.margin_small)
 			badge.number = count
 			badge.isVisible = true
 		}
@@ -343,9 +344,8 @@ class DetailsActivity :
 		val manga = viewModel.manga.value ?: return
 		val chapterId = viewModel.historyInfo.value.history?.chapterId
 		if (chapterId != null && manga.chapters?.none { x -> x.id == chapterId } == true) {
-			val snackbar =
-				makeSnackbar(getString(R.string.chapter_is_missing), Snackbar.LENGTH_SHORT)
-			snackbar.show()
+			Snackbar.make(viewBinding.containerDetails, R.string.chapter_is_missing, Snackbar.LENGTH_SHORT)
+				.show()
 		} else {
 			startActivity(
 				IntentBuilder(this)
@@ -365,6 +365,7 @@ class DetailsActivity :
 		val adapter = DetailsPagerAdapter(this)
 		viewBinding.pager.adapter = adapter
 		TabLayoutMediator(viewBinding.tabs, viewBinding.pager, adapter).attach()
+		viewBinding.pager.setCurrentItem(settings.defaultDetailsTab, false)
 	}
 
 	private fun showBottomSheet(isVisible: Boolean) {
@@ -377,17 +378,6 @@ class DetailsActivity :
 		view.isVisible = isVisible
 	}
 
-	private fun makeSnackbar(
-		text: CharSequence,
-		@BaseTransientBottomBar.Duration duration: Int,
-	): Snackbar {
-		val sb = Snackbar.make(viewBinding.containerDetails, text, duration)
-		if (viewBinding.layoutBottom?.isVisible == true) {
-			sb.anchorView = viewBinding.toolbarChapters
-		}
-		return sb
-	}
-
 	private class PrefetchObserver(
 		private val context: Context,
 	) : FlowCollector<List<ChapterListItem>?> {

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

@@ -10,8 +10,6 @@ import android.widget.Toast
 import androidx.appcompat.widget.PopupMenu
 import androidx.core.content.ContextCompat
 import androidx.core.graphics.Insets
-import androidx.core.text.buildSpannedString
-import androidx.core.text.color
 import androidx.core.text.method.LinkMovementMethodCompat
 import androidx.core.view.isGone
 import androidx.core.view.isVisible
@@ -23,7 +21,6 @@ import coil.request.SuccessResult
 import coil.util.CoilUtils
 import com.google.android.material.chip.Chip
 import dagger.hilt.android.AndroidEntryPoint
-import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.filterNotNull
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.bookmarks.domain.Bookmark
@@ -42,7 +39,6 @@ import org.koitharu.kotatsu.core.util.FileSize
 import org.koitharu.kotatsu.core.util.ext.crossfade
 import org.koitharu.kotatsu.core.util.ext.drawableTop
 import org.koitharu.kotatsu.core.util.ext.enqueueWith
-import org.koitharu.kotatsu.core.util.ext.getThemeColor
 import org.koitharu.kotatsu.core.util.ext.ifNullOrEmpty
 import org.koitharu.kotatsu.core.util.ext.isTextTruncated
 import org.koitharu.kotatsu.core.util.ext.observe
@@ -75,7 +71,6 @@ import org.koitharu.kotatsu.scrobbling.common.ui.selector.ScrobblingSelectorShee
 import org.koitharu.kotatsu.search.ui.MangaListActivity
 import org.koitharu.kotatsu.search.ui.SearchActivity
 import javax.inject.Inject
-import com.google.android.material.R as materialR
 
 @AndroidEntryPoint
 class DetailsFragment :
@@ -122,7 +117,7 @@ class DetailsFragment :
 		viewModel.description.observe(viewLifecycleOwner, ::onDescriptionChanged)
 		viewModel.localSize.observe(viewLifecycleOwner, ::onLocalSizeChanged)
 		viewModel.relatedManga.observe(viewLifecycleOwner, ::onRelatedMangaChanged)
-		combine(viewModel.chapters, viewModel.newChaptersCount, ::Pair).observe(viewLifecycleOwner, ::onChaptersChanged)
+		viewModel.chapters.observe(viewLifecycleOwner, ::onChaptersChanged)
 	}
 
 	override fun onItemClick(item: Bookmark, view: View) {
@@ -204,8 +199,7 @@ class DetailsFragment :
 		}
 	}
 
-	private fun onChaptersChanged(data: Pair<List<ChapterListItem>?, Int>) {
-		val (chapters, newChapters) = data
+	private fun onChaptersChanged(chapters: List<ChapterListItem>?) {
 		val infoLayout = requireViewBinding().infoLayout
 		if (chapters.isNullOrEmpty()) {
 			infoLayout.textViewChapters.isVisible = false
@@ -213,19 +207,7 @@ class DetailsFragment :
 			val count = chapters.countChaptersByBranch()
 			infoLayout.textViewChapters.isVisible = true
 			val chaptersText = resources.getQuantityString(R.plurals.chapters, count, count)
-			infoLayout.textViewChapters.text = if (newChapters == 0) {
-				chaptersText
-			} else {
-				buildSpannedString {
-					append(chaptersText)
-					append(' ')
-					color(infoLayout.textViewChapters.context.getThemeColor(materialR.attr.colorError)) {
-						append("(+")
-						append(newChapters.toString())
-						append(')')
-					}
-				}
-			}
+			infoLayout.textViewChapters.text = chaptersText
 		}
 	}
 

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

@@ -21,6 +21,7 @@ import kotlinx.coroutines.flow.mapLatest
 import kotlinx.coroutines.flow.stateIn
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.plus
+import okio.FileNotFoundException
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.bookmarks.domain.Bookmark
 import org.koitharu.kotatsu.bookmarks.domain.BookmarksRepository
@@ -30,6 +31,7 @@ import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.ListMode
 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.ext.MutableEventFlow
 import org.koitharu.kotatsu.core.util.ext.call
 import org.koitharu.kotatsu.core.util.ext.computeSize
@@ -80,7 +82,7 @@ class DetailsViewModel @Inject constructor(
 	private val mangaId = intent.mangaId
 	private var loadingJob: Job
 
-	val onShowToast = MutableEventFlow<Int>()
+	val onActionDone = MutableEventFlow<ReversibleAction>()
 	val onShowTip = MutableEventFlow<Unit>()
 	val onSelectChapter = MutableEventFlow<Long>()
 	val onDownloadStarted = MutableEventFlow<Unit>()
@@ -234,7 +236,7 @@ class DetailsViewModel @Inject constructor(
 	fun deleteLocal() {
 		val m = details.value?.local?.manga
 		if (m == null) {
-			onShowToast.call(R.string.file_not_found)
+			errorEvent.call(FileNotFoundException())
 			return
 		}
 		launchLoadingJob(Dispatchers.Default) {
@@ -246,7 +248,7 @@ class DetailsViewModel @Inject constructor(
 	fun removeBookmark(bookmark: Bookmark) {
 		launchJob(Dispatchers.Default) {
 			bookmarksRepository.removeBookmark(bookmark)
-			onShowToast.call(R.string.bookmark_removed)
+			onActionDone.call(ReversibleAction(R.string.bookmark_removed, null))
 		}
 	}
 

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

@@ -5,6 +5,8 @@ import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
 import androidx.core.graphics.Insets
+import androidx.core.view.isInvisible
+import androidx.core.view.isVisible
 import androidx.fragment.app.activityViewModels
 import androidx.fragment.app.viewModels
 import androidx.recyclerview.widget.GridLayoutManager
@@ -21,7 +23,6 @@ import org.koitharu.kotatsu.core.ui.list.OnListItemClickListener
 import org.koitharu.kotatsu.core.util.RecyclerViewScrollCallback
 import org.koitharu.kotatsu.core.util.ext.observe
 import org.koitharu.kotatsu.core.util.ext.observeEvent
-import org.koitharu.kotatsu.core.util.ext.plus
 import org.koitharu.kotatsu.core.util.ext.showOrHide
 import org.koitharu.kotatsu.databinding.FragmentPagesBinding
 import org.koitharu.kotatsu.details.ui.DetailsViewModel
@@ -55,9 +56,6 @@ class PagesFragment :
 	private var scrollListener: ScrollListener? = null
 
 	private val spanSizeLookup = SpanSizeLookup()
-	private val listCommitCallback = Runnable {
-		spanSizeLookup.invalidateCache()
-	}
 
 	override fun onCreate(savedInstanceState: Bundle?) {
 		super.onCreate(savedInstanceState)
@@ -66,7 +64,7 @@ class PagesFragment :
 			detailsViewModel.history,
 			detailsViewModel.selectedBranch,
 		) { details, history, branch ->
-			if (details?.isLoaded == true) {
+			if (details != null && (details.isLoaded || details.chapters.isNotEmpty())) {
 				PagesViewModel.State(details, history, branch)
 			} else {
 				null
@@ -89,6 +87,7 @@ class PagesFragment :
 		with(binding.recyclerView) {
 			addItemDecoration(TypedListSpacingDecoration(context, false))
 			adapter = thumbnailsAdapter
+			setHasFixedSize(true)
 			addOnLayoutChangeListener(spanResolver)
 			spanResolver?.setGridSize(settings.gridSize / 100f, this)
 			addOnScrollListener(ScrollListener().also { scrollListener = it })
@@ -97,6 +96,7 @@ class PagesFragment :
 				it.spanCount = checkNotNull(spanResolver).spanCount
 			}
 		}
+		detailsViewModel.isChaptersEmpty.observe(viewLifecycleOwner, ::onNoChaptersChanged)
 		viewModel.thumbnails.observe(viewLifecycleOwner, ::onThumbnailsChanged)
 		viewModel.onError.observeEvent(viewLifecycleOwner, SnackbarErrorObserver(binding.recyclerView, this))
 		viewModel.isLoading.observe(viewLifecycleOwner) { binding.progressBar.showOrHide(it) }
@@ -121,7 +121,7 @@ class PagesFragment :
 		startActivity(intent)
 	}
 
-	private fun onThumbnailsChanged(list: List<ListModel>) {
+	private suspend fun onThumbnailsChanged(list: List<ListModel>) {
 		val adapter = thumbnailsAdapter ?: return
 		if (adapter.itemCount == 0) {
 			var position = list.indexOfFirst { it is PageThumbnail && it.isCurrent }
@@ -134,12 +134,24 @@ class PagesFragment :
 					0
 				}
 				val scrollCallback = RecyclerViewScrollCallback(requireViewBinding().recyclerView, position, offset)
-				adapter.setItems(list, listCommitCallback + scrollCallback)
+				adapter.emit(list)
+				scrollCallback.run()
 			} else {
-				adapter.setItems(list, listCommitCallback)
+				adapter.emit(list)
 			}
 		} else {
-			adapter.setItems(list, listCommitCallback)
+			adapter.emit(list)
+		}
+		spanSizeLookup.invalidateCache()
+		viewBinding?.recyclerView?.let {
+			scrollListener?.postInvalidate(it)
+		}
+	}
+
+	private fun onNoChaptersChanged(isNoChapters: Boolean) {
+		with(viewBinding ?: return) {
+			textViewHolder.isVisible = isNoChapters
+			recyclerView.isInvisible = isNoChapters
 		}
 	}
 

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

@@ -66,7 +66,9 @@ class PagesViewModel @Inject constructor(
 	private suspend fun doInit(state: State) {
 		chaptersLoader.init(state.details)
 		val initialChapterId = state.history?.chapterId ?: state.details.allChapters.firstOrNull()?.id ?: return
-		chaptersLoader.loadSingleChapter(initialChapterId)
+		if (!chaptersLoader.hasPages(initialChapterId)) {
+			chaptersLoader.loadSingleChapter(initialChapterId)
+		}
 		updateList(state.history)
 	}
 

app/src/main/kotlin/org/koitharu/kotatsu/list/ui/MangaListFragment.kt

@@ -171,6 +171,9 @@ abstract class MangaListFragment :
 	private suspend fun onListChanged(list: List<ListModel>) {
 		listAdapter?.emit(list)
 		spanSizeLookup.invalidateCache()
+		viewBinding?.recyclerView?.let {
+			paginationListener?.postInvalidate(it)
+		}
 	}
 
 	private fun resolveException(e: Throwable) {

app/src/main/kotlin/org/koitharu/kotatsu/reader/domain/ChapterPages.kt

@@ -1,6 +1,7 @@
 package org.koitharu.kotatsu.reader.domain
 
 import androidx.collection.LongSparseArray
+import androidx.collection.contains
 import org.koitharu.kotatsu.reader.ui.pager.ReaderPage
 
 class ChapterPages private constructor(private val pages: ArrayDeque<ReaderPage>) : List<ReaderPage> by pages {
@@ -57,6 +58,8 @@ class ChapterPages private constructor(private val pages: ArrayDeque<ReaderPage>
 		return pages.subList(range.first, range.last + 1)
 	}
 
+	operator fun contains(chapterId: Long)  = indices.contains(chapterId)
+
 	private fun shiftIndices(delta: Int) {
 		for (i in 0 until indices.size()) {
 			val range = indices.valueAt(i)

app/src/main/kotlin/org/koitharu/kotatsu/reader/domain/ChaptersLoader.kt

@@ -67,6 +67,10 @@ class ChaptersLoader @Inject constructor(
 
 	fun peekChapter(chapterId: Long): MangaChapter? = chapters[chapterId]
 
+	fun hasPages(chapterId: Long): Boolean {
+		return chapterId in chapterPages
+	}
+
 	fun getPages(chapterId: Long): List<ReaderPage> {
 		return chapterPages.subList(chapterId)
 	}

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

@@ -12,6 +12,7 @@
 		android:layout_height="match_parent"
 		android:clipToPadding="false"
 		android:orientation="vertical"
+		android:scrollIndicators="top"
 		app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager"
 		tools:listitem="@layout/item_chapter" />
 

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

@@ -12,6 +12,7 @@
 		android:layout_height="match_parent"
 		android:clipToPadding="false"
 		android:orientation="vertical"
+		android:scrollIndicators="top"
 		app:bubbleSize="small"
 		app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
 		tools:listitem="@layout/item_page_thumb"

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

@@ -17,13 +17,10 @@
 
 	<TextView
 		android:id="@+id/textView_state"
+		style="@style/Widget.Kotatsu.TextView.Indicator.Vertical"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
 		android:layout_weight="1"
-		android:drawablePadding="4dp"
-		android:gravity="center_horizontal"
-		android:padding="4dp"
-		android:textSize="12sp"
 		android:visibility="gone"
 		tools:drawableTopCompat="@drawable/ic_state_finished"
 		tools:text="Completed"
@@ -31,13 +28,10 @@
 
 	<TextView
 		android:id="@+id/textView_chapters"
+		style="@style/Widget.Kotatsu.TextView.Indicator.Vertical"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
 		android:layout_weight="1"
-		android:drawablePadding="4dp"
-		android:gravity="center_horizontal"
-		android:padding="4dp"
-		android:textSize="12sp"
 		android:visibility="gone"
 		app:drawableTopCompat="@drawable/ic_book_page"
 		tools:text="52 chapters"
@@ -45,28 +39,22 @@
 
 	<TextView
 		android:id="@+id/textView_nsfw"
+		style="@style/Widget.Kotatsu.TextView.Indicator.Vertical"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
 		android:layout_weight="1"
-		android:drawablePadding="4dp"
-		android:gravity="center"
-		android:padding="4dp"
 		android:text="@string/nsfw"
-		android:textSize="12sp"
 		android:visibility="gone"
 		app:drawableTopCompat="@drawable/ic_alert_outline"
 		tools:visibility="visible" />
 
 	<TextView
 		android:id="@+id/textView_source"
+		style="@style/Widget.Kotatsu.TextView.Indicator.Vertical"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
 		android:layout_weight="1"
 		android:background="?selectableItemBackgroundBorderless"
-		android:drawablePadding="4dp"
-		android:gravity="center"
-		android:padding="4dp"
-		android:textSize="12sp"
 		android:visibility="gone"
 		app:drawableTopCompat="@drawable/ic_web"
 		tools:text="Source"
@@ -74,13 +62,10 @@
 
 	<TextView
 		android:id="@+id/textView_size"
+		style="@style/Widget.Kotatsu.TextView.Indicator.Vertical"
 		android:layout_width="0dp"
 		android:layout_height="wrap_content"
 		android:layout_weight="1"
-		android:drawablePadding="4dp"
-		android:gravity="center"
-		android:padding="4dp"
-		android:textSize="12sp"
 		android:visibility="gone"
 		app:drawableTopCompat="@drawable/ic_storage"
 		tools:text="1.8 GiB"

app/src/main/res/values/arrays.xml

@@ -81,4 +81,8 @@
 		<item>@string/frequency_twice_per_month</item>
 		<item>@string/frequency_once_per_month</item>
 	</string-array>
+	<string-array name="details_tabs" translatable="false">
+		<item>@string/chapters</item>
+		<item>@string/pages</item>
+	</string-array>
 </resources>

app/src/main/res/values/constants.xml

@@ -70,4 +70,8 @@
 		<item>14</item>
 		<item>30</item>
 	</string-array>
+	<string-array name="details_tabs_values" translatable="false">
+		<item>0</item>
+		<item>1</item>
+	</string-array>
 </resources>

app/src/main/res/values/strings.xml

@@ -555,4 +555,5 @@
 	<string name="rating_safe">Safe</string>
 	<string name="rating_suggestive">Suggestive</string>
 	<string name="rating_adult">Adult</string>
+	<string name="default_tab">Default tab</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -220,6 +220,16 @@
 		<item name="android:textAppearance">?textAppearanceLabelMedium</item>
 	</style>
 
+	<style name="Widget.Kotatsu.TextView.Indicator.Vertical" parent="Widget.MaterialComponents.TextView">
+		<item name="android:drawablePadding">4dp</item>
+		<item name="android:gravity">center</item>
+		<item name="android:textAlignment">center</item>
+		<item name="android:padding">4dp</item>
+		<item name="android:singleLine">true</item>
+		<item name="android:textSize">12sp</item>
+		<item name="android:elegantTextHeight">false</item>
+	</style>
+
 	<style name="ThemeOverlay.Kotatsu.MainToolbar" parent="">
 		<item name="colorControlHighlight">@color/selector_overlay</item>
 	</style>

app/src/main/res/xml/pref_appearance.xml

@@ -46,6 +46,19 @@
 
 	</PreferenceCategory>
 
+	<PreferenceCategory
+		android:title="@string/details">
+
+		<ListPreference
+			android:defaultValue="0"
+			android:entries="@array/details_tabs"
+			android:entryValues="@array/details_tabs_values"
+			android:key="details_tab"
+			android:title="@string/default_tab"
+			app:useSimpleSummaryProvider="true" />
+
+	</PreferenceCategory>
+
 	<PreferenceScreen
 		android:fragment="org.koitharu.kotatsu.settings.nav.NavConfigFragment"
 		android:key="nav_main"