Reader background option

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

@@ -130,6 +130,9 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 	val readerAnimation: Boolean
 		get() = prefs.getBoolean(KEY_READER_ANIMATION, false)
 
+	val readerBackground: ReaderBackground
+		get() = prefs.getEnumValue(KEY_READER_BACKGROUND, ReaderBackground.DEFAULT)
+
 	val defaultReaderMode: ReaderMode
 		get() = prefs.getEnumValue(KEY_READER_MODE, ReaderMode.STANDARD)
 
@@ -454,6 +457,7 @@ class AppSettings @Inject constructor(@ApplicationContext context: Context) {
 		const val KEY_SYNC_SETTINGS = "sync_settings"
 		const val KEY_READER_BAR = "reader_bar"
 		const val KEY_READER_SLIDER = "reader_slider"
+		const val KEY_READER_BACKGROUND = "reader_background"
 		const val KEY_SHORTCUTS = "dynamic_shortcuts"
 		const val KEY_READER_TAPS_LTR = "reader_taps_ltr"
 		const val KEY_LOCAL_LIST_ORDER = "local_order"

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

@@ -0,0 +1,25 @@
+package org.koitharu.kotatsu.core.prefs
+
+import android.content.Context
+import android.view.ContextThemeWrapper
+import androidx.core.content.ContextCompat
+import androidx.core.graphics.drawable.toDrawable
+import org.koitharu.kotatsu.core.util.ext.getThemeDrawable
+import com.google.android.material.R as materialR
+
+enum class ReaderBackground {
+
+	DEFAULT, LIGHT, DARK, WHITE, BLACK;
+
+	fun resolve(context: Context) = when (this) {
+		DEFAULT -> context.getThemeDrawable(android.R.attr.windowBackground)
+		LIGHT -> ContextThemeWrapper(context, materialR.style.ThemeOverlay_Material3_Light)
+			.getThemeDrawable(android.R.attr.windowBackground)
+
+		DARK -> ContextThemeWrapper(context, materialR.style.ThemeOverlay_Material3_Dark)
+			.getThemeDrawable(android.R.attr.windowBackground)
+
+		WHITE -> ContextCompat.getColor(context, android.R.color.white).toDrawable()
+		BLACK -> ContextCompat.getColor(context, android.R.color.black).toDrawable()
+	}
+}

app/src/main/kotlin/org/koitharu/kotatsu/main/ui/MainViewModel.kt

@@ -51,10 +51,10 @@ class MainViewModel @Inject constructor(
 
 	val counters = combine(
 		trackingRepository.observeUpdatedMangaCount(),
-		flow { emit(settings.newSources) },
+		flow { emit(settings.newSources.size) },
 	) { tracks, newSources ->
 		val a = SparseIntArray(2)
-		a[R.id.nav_explore] = newSources.size
+		a[R.id.nav_explore] = newSources
 		a[R.id.nav_feed] = tracks
 		a
 	}.stateIn(

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/config/ReaderSettings.kt

@@ -1,6 +1,7 @@
 package org.koitharu.kotatsu.reader.ui.config
 
 import android.content.SharedPreferences
+import android.view.View
 import androidx.lifecycle.MediatorLiveData
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
@@ -31,6 +32,11 @@ class ReaderSettings(
 	val isPagesNumbersEnabled: Boolean
 		get() = settings.isPagesNumbersEnabled
 
+	fun applyBackground(view: View) {
+		val bg = settings.readerBackground
+		view.background = bg.resolve(view.context)
+	}
+
 	override fun onInactive() {
 		super.onInactive()
 		settings.unsubscribe(internalObserver)
@@ -64,7 +70,12 @@ class ReaderSettings(
 		}
 
 		override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences?, key: String?) {
-			if (key == AppSettings.KEY_ZOOM_MODE || key == AppSettings.KEY_PAGES_NUMBERS || key == AppSettings.KEY_WEBTOON_ZOOM) {
+			if (
+				key == AppSettings.KEY_ZOOM_MODE ||
+				key == AppSettings.KEY_PAGES_NUMBERS ||
+				key == AppSettings.KEY_WEBTOON_ZOOM ||
+				key == AppSettings.KEY_READER_BACKGROUND
+			) {
 				notifyChanged()
 			}
 		}

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/pager/BasePageHolder.kt

@@ -13,7 +13,7 @@ import org.koitharu.kotatsu.reader.ui.config.ReaderSettings
 abstract class BasePageHolder<B : ViewBinding>(
 	protected val binding: B,
 	loader: PageLoader,
-	settings: ReaderSettings,
+	private val settings: ReaderSettings,
 	networkState: NetworkState,
 	exceptionResolver: ExceptionResolver,
 ) : RecyclerView.ViewHolder(binding.root), PageHolderDelegate.Callback {
@@ -28,6 +28,10 @@ abstract class BasePageHolder<B : ViewBinding>(
 	var boundData: ReaderPage? = null
 		private set
 
+	override fun onConfigChanged() {
+		settings.applyBackground(itemView)
+	}
+
 	fun requireData(): ReaderPage {
 		return checkNotNull(boundData) { "Calling requireData() before bind()" }
 	}

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/pager/PageHolderDelegate.kt

@@ -18,10 +18,10 @@ import kotlinx.coroutines.launch
 import kotlinx.coroutines.plus
 import org.koitharu.kotatsu.core.exceptions.resolve.ExceptionResolver
 import org.koitharu.kotatsu.core.os.NetworkState
+import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
 import org.koitharu.kotatsu.parsers.model.MangaPage
 import org.koitharu.kotatsu.reader.domain.PageLoader
 import org.koitharu.kotatsu.reader.ui.config.ReaderSettings
-import org.koitharu.kotatsu.core.util.ext.printStackTraceDebug
 import java.io.File
 import java.io.IOException
 
@@ -39,6 +39,10 @@ class PageHolderDelegate(
 	private var file: File? = null
 	private var error: Throwable? = null
 
+	init {
+		callback.onConfigChanged()
+	}
+
 	fun onBind(page: MangaPage) {
 		val prevJob = job
 		job = scope.launch {
@@ -107,6 +111,7 @@ class PageHolderDelegate(
 		if (state == State.SHOWN) {
 			callback.onImageShowing(readerSettings)
 		}
+		callback.onConfigChanged()
 	}
 
 	private fun tryConvert(file: File, e: Exception) {
@@ -178,5 +183,7 @@ class PageHolderDelegate(
 		fun onImageShown()
 
 		fun onProgressChanged(progress: Int)
+
+		fun onConfigChanged()
 	}
 }

app/src/main/kotlin/org/koitharu/kotatsu/settings/ReaderSettingsFragment.kt

@@ -10,6 +10,7 @@ import dagger.hilt.android.AndroidEntryPoint
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.core.model.ZoomMode
 import org.koitharu.kotatsu.core.prefs.AppSettings
+import org.koitharu.kotatsu.core.prefs.ReaderBackground
 import org.koitharu.kotatsu.core.prefs.ReaderMode
 import org.koitharu.kotatsu.core.ui.BasePreferenceFragment
 import org.koitharu.kotatsu.core.util.ext.setDefaultValueCompat
@@ -24,23 +25,18 @@ class ReaderSettingsFragment :
 	override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
 		addPreferencesFromResource(R.xml.pref_reader)
 		findPreference<ListPreference>(AppSettings.KEY_READER_MODE)?.run {
-			entryValues = arrayOf(
-				ReaderMode.STANDARD,
-				ReaderMode.REVERSED,
-				ReaderMode.WEBTOON,
-			).names()
+			entryValues = ReaderMode.values().names()
 			setDefaultValueCompat(ReaderMode.STANDARD.name)
 		}
+		findPreference<ListPreference>(AppSettings.KEY_READER_BACKGROUND)?.run {
+			entryValues = ReaderBackground.values().names()
+			setDefaultValueCompat(ReaderBackground.DEFAULT.name)
+		}
 		findPreference<MultiSelectListPreference>(AppSettings.KEY_READER_SWITCHERS)?.run {
 			summaryProvider = MultiSummaryProvider(R.string.gestures_only)
 		}
 		findPreference<ListPreference>(AppSettings.KEY_ZOOM_MODE)?.run {
-			entryValues = arrayOf(
-				ZoomMode.FIT_CENTER,
-				ZoomMode.FIT_HEIGHT,
-				ZoomMode.FIT_WIDTH,
-				ZoomMode.KEEP_START,
-			).names()
+			entryValues = ZoomMode.values().names()
 			setDefaultValueCompat(ZoomMode.FIT_CENTER.name)
 		}
 		updateReaderModeDependency()

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

@@ -4,8 +4,7 @@
 	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"
-	android:background="?android:windowBackground">
+	android:layout_height="match_parent">
 
 	<com.davemorrissey.labs.subscaleview.SubsamplingScaleImageView
 		android:id="@+id/ssiv"

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

@@ -58,4 +58,11 @@
 		<item>HTTP</item>
 		<item>SOCKS (v4/v5)</item>
 	</string-array>
+	<string-array name="reader_backgrounds">
+		<item>@string/system_default</item>
+		<item>@string/color_light</item>
+		<item>@string/color_dark</item>
+		<item>@string/color_white</item>
+		<item>@string/color_black</item>
+	</string-array>
 </resources>

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

@@ -453,4 +453,9 @@
 	<string name="this_month">This month</string>
 	<string name="voice_search">Voice search</string>
 	<string name="related_manga">Related manga</string>
+	<string name="color_light">Light</string>
+	<string name="color_dark">Dark</string>
+	<string name="color_white">White</string>
+	<string name="color_black">Black</string>
+	<string name="background">Background</string>
 </resources>

app/src/main/res/xml/pref_reader.xml

@@ -60,6 +60,12 @@
 		android:key="reader_slider"
 		android:title="@string/reader_slider" />
 
+	<ListPreference
+		android:entries="@array/reader_backgrounds"
+		android:key="reader_background"
+		android:title="@string/background"
+		app:useSimpleSummaryProvider="true" />
+
 	<SwitchPreferenceCompat
 		android:defaultValue="false"
 		android:key="pages_numbers"