Reader background option

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()
 	}
 }