Fix hiding page loading indicator (close #1357)

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

@@ -1,28 +0,0 @@
-package org.koitharu.kotatsu.core.util
-
-import android.view.View
-import android.view.ViewTreeObserver
-
-/**
- * ProgressIndicator become INVISIBLE instead of GONE by hide() call.
- * It`s final so we need this workaround
- */
-class GoneOnInvisibleListener(
-	private val view: View,
-) : ViewTreeObserver.OnGlobalLayoutListener {
-
-	override fun onGlobalLayout() {
-		if (view.visibility == View.INVISIBLE) {
-			view.visibility = View.GONE
-		}
-	}
-
-	fun attach() {
-		view.viewTreeObserver.addOnGlobalLayoutListener(this)
-		onGlobalLayout()
-	}
-
-	fun detach() {
-		view.viewTreeObserver.removeOnGlobalLayoutListener(this)
-	}
-}

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

@@ -10,7 +10,6 @@ import androidx.appcompat.widget.ActionMenuView
 import androidx.appcompat.widget.Toolbar
 import androidx.core.view.children
 import androidx.core.view.descendants
-import androidx.core.view.isVisible
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentManager
 import androidx.recyclerview.widget.RecyclerView
@@ -155,9 +154,9 @@ fun TabLayout.setTabsEnabled(enabled: Boolean) {
 
 fun BaseProgressIndicator<*>.showOrHide(value: Boolean) {
 	if (value) {
-		if (!isVisible) show()
+		show()
 	} else {
-		if (isVisible) hide()
+		hide()
 	}
 }
 

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

@@ -1,6 +1,9 @@
 package org.koitharu.kotatsu.reader.ui.pager
 
+import android.content.ComponentCallbacks2
+import android.content.ComponentCallbacks2.TRIM_MEMORY_COMPLETE
 import android.content.Context
+import android.content.res.Configuration
 import android.view.View
 import androidx.annotation.CallSuper
 import androidx.core.view.isGone
@@ -21,7 +24,6 @@ import org.koitharu.kotatsu.core.util.ext.getDisplayMessage
 import org.koitharu.kotatsu.core.util.ext.isLowRamDevice
 import org.koitharu.kotatsu.core.util.ext.isSerializable
 import org.koitharu.kotatsu.core.util.ext.observe
-import org.koitharu.kotatsu.core.util.ext.showOrHide
 import org.koitharu.kotatsu.databinding.LayoutPageInfoBinding
 import org.koitharu.kotatsu.parsers.util.ifZero
 import org.koitharu.kotatsu.reader.domain.PageLoader
@@ -37,7 +39,7 @@ abstract class BasePageHolder<B : ViewBinding>(
 	networkState: NetworkState,
 	exceptionResolver: ExceptionResolver,
 	lifecycleOwner: LifecycleOwner,
-) : LifecycleAwareViewHolder(binding.root, lifecycleOwner), DefaultOnImageEventListener {
+) : LifecycleAwareViewHolder(binding.root, lifecycleOwner), DefaultOnImageEventListener, ComponentCallbacks2 {
 
 	protected val viewModel = PageViewModel(
 		loader = loader,
@@ -82,9 +84,12 @@ abstract class BasePageHolder<B : ViewBinding>(
 	@CallSuper
 	protected open fun onConfigChanged(settings: ReaderSettings) {
 		settings.applyBackground(itemView)
-		if (viewModel.state.value is PageState.Shown) {
+		if (settings.applyBitmapConfig(ssiv)) {
+			reloadImage()
+		} else if (viewModel.state.value is PageState.Shown) {
 			onReady()
 		}
+		ssiv.applyDownSampling(isResumed())
 	}
 
 	fun reloadImage() {
@@ -103,7 +108,7 @@ abstract class BasePageHolder<B : ViewBinding>(
 
 	override fun onCreate() {
 		super.onCreate()
-		context.registerComponentCallbacks(viewModel)
+		context.registerComponentCallbacks(this)
 		viewModel.state.observe(this, ::onStateChanged)
 		viewModel.settingsProducer.observe(this, ::onConfigChanged)
 	}
@@ -122,7 +127,7 @@ abstract class BasePageHolder<B : ViewBinding>(
 	}
 
 	override fun onDestroy() {
-		context.unregisterComponentCallbacks(viewModel)
+		context.unregisterComponentCallbacks(this)
 		super.onDestroy()
 	}
 
@@ -136,9 +141,18 @@ abstract class BasePageHolder<B : ViewBinding>(
 		ssiv.recycle()
 	}
 
+	override fun onTrimMemory(level: Int) {
+		// TODO
+	}
+
+	override fun onConfigurationChanged(newConfig: Configuration) = Unit
+
+	@Deprecated("Deprecated in Java")
+	final override fun onLowMemory() = onTrimMemory(TRIM_MEMORY_COMPLETE)
+
 	protected open fun onStateChanged(state: PageState) {
 		bindingInfo.layoutError.isVisible = state is PageState.Error
-		bindingInfo.progressBar.showOrHide(!state.isFinalState())
+		bindingInfo.progressBar.isGone = state.isFinalState()
 		bindingInfo.textViewStatus.isGone = state.isFinalState()
 		val progress = (state as? PageState.Loading)?.progress ?: -1
 		if (progress in 0..100) {

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

@@ -30,17 +30,12 @@ open class PageHolder(
 	networkState = networkState,
 	exceptionResolver = exceptionResolver,
 	lifecycleOwner = owner,
-),
-	ZoomControl.ZoomControlListener {
+), ZoomControl.ZoomControlListener {
 
 	override val ssiv = binding.ssiv
 
 	override fun onConfigChanged(settings: ReaderSettings) {
 		super.onConfigChanged(settings)
-		if (settings.applyBitmapConfig(binding.ssiv)) {
-			reloadImage()
-		}
-		binding.ssiv.applyDownSampling(isResumed())
 		binding.textViewNumber.isVisible = settings.isPagesNumbersEnabled
 	}
 
@@ -50,11 +45,6 @@ open class PageHolder(
 		binding.textViewNumber.text = (data.index + 1).toString()
 	}
 
-	override fun onRecycled() {
-		super.onRecycled()
-		binding.ssiv.recycle()
-	}
-
 	override fun onReady() {
 		binding.ssiv.maxScale = 2f * maxOf(
 			binding.ssiv.width / binding.ssiv.sWidth.toFloat(),

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

@@ -1,7 +1,5 @@
 package org.koitharu.kotatsu.reader.ui.pager.vm
 
-import android.content.ComponentCallbacks2
-import android.content.res.Configuration
 import android.graphics.Rect
 import android.net.Uri
 import androidx.annotation.WorkerThread
@@ -20,6 +18,7 @@ import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.flow.update
 import kotlinx.coroutines.launch
 import kotlinx.coroutines.plus
+import kotlinx.coroutines.withContext
 import okio.IOException
 import org.koitharu.kotatsu.core.exceptions.resolve.ExceptionResolver
 import org.koitharu.kotatsu.core.os.NetworkState
@@ -35,7 +34,7 @@ class PageViewModel(
 	private val networkState: NetworkState,
 	private val exceptionResolver: ExceptionResolver,
 	private val isWebtoon: Boolean,
-) : DefaultOnImageEventListener, ComponentCallbacks2 {
+) : DefaultOnImageEventListener {
 
 	private val scope = loader.loaderScope + Dispatchers.Main.immediate
 	private var job: Job? = null
@@ -43,12 +42,6 @@ class PageViewModel(
 
 	val state = MutableStateFlow<PageState>(PageState.Empty)
 
-	init {
-		scope.launch(Dispatchers.Main) { // the same as post() -- wait until child fields init
-			// callback.onConfigChanged()
-		}
-	}
-
 	fun isLoading() = job?.isActive == true
 
 	fun onBind(page: MangaPage) {
@@ -64,13 +57,14 @@ class PageViewModel(
 		job = scope.launch {
 			prevJob?.cancelAndJoin()
 			val e = (state.value as? PageState.Error)?.error
-			if (e != null && ExceptionResolver.Companion.canResolve(e)) {
-				if (!isFromUser) {
-					return@launch
+			if (e != null && ExceptionResolver.canResolve(e)) {
+				if (isFromUser) {
+					exceptionResolver.resolve(e)
 				}
-				exceptionResolver.resolve(e)
 			}
-			doLoad(page, force = true)
+			withContext(Dispatchers.Default) {
+				doLoad(page, force = true)
+			}
 		}
 	}
 
@@ -86,8 +80,12 @@ class PageViewModel(
 	}
 
 	override fun onImageLoaded() {
-		state.update {
-			if (it is PageState.Loaded) PageState.Shown(it.source, it.isConverted) else it
+		state.update { currentState ->
+			if (currentState is PageState.Loaded) {
+				PageState.Shown(currentState.source, currentState.isConverted)
+			} else {
+				currentState
+			}
 		}
 	}
 
@@ -109,18 +107,9 @@ class PageViewModel(
 		}
 	}
 
-	override fun onConfigurationChanged(newConfig: Configuration) = Unit
-
-	@Suppress("OVERRIDE_DEPRECATION")
-	override fun onLowMemory() = Unit
-
-	override fun onTrimMemory(level: Int) {
-		// callback.onTrimMemory()
-	}
-
 	private fun tryConvert(uri: Uri, e: Exception) {
 		val prevJob = job
-		job = scope.launch {
+		job = scope.launch(Dispatchers.Default) {
 			prevJob?.join()
 			state.value = PageState.Converting()
 			try {
@@ -143,7 +132,7 @@ class PageViewModel(
 
 	@WorkerThread
 	private suspend fun doLoad(data: MangaPage, force: Boolean) = coroutineScope {
-		state.value = PageState.Loading(null/* TODO */, -1)
+		state.value = PageState.Loading(null, -1)
 		val previewJob = launch {
 			val preview = loader.loadPreview(data) ?: return@launch
 			state.update {

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

@@ -1,9 +1,9 @@
 package org.koitharu.kotatsu.reader.ui.pager.webtoon
 
+import android.view.View
 import androidx.lifecycle.LifecycleOwner
 import org.koitharu.kotatsu.core.exceptions.resolve.ExceptionResolver
 import org.koitharu.kotatsu.core.os.NetworkState
-import org.koitharu.kotatsu.core.util.GoneOnInvisibleListener
 import org.koitharu.kotatsu.databinding.ItemPageWebtoonBinding
 import org.koitharu.kotatsu.reader.domain.PageLoader
 import org.koitharu.kotatsu.reader.ui.config.ReaderSettings
@@ -28,29 +28,9 @@ class WebtoonHolder(
 	override val ssiv = binding.ssiv
 
 	private var scrollToRestore = 0
-	private val goneOnInvisibleListener = GoneOnInvisibleListener(bindingInfo.progressBar)
 
-	override fun onConfigChanged(settings: ReaderSettings) {
-		super.onConfigChanged(settings)
-		if (settings.applyBitmapConfig(binding.ssiv)) {
-			reloadImage()
-		}
-		binding.ssiv.applyDownSampling(isResumed())
-	}
-
-	override fun onRecycled() {
-		super.onRecycled()
-		binding.ssiv.recycle()
-	}
-
-	override fun onAttachedToWindow() {
-		super.onAttachedToWindow()
-		goneOnInvisibleListener.attach()
-	}
-
-	override fun onDetachedFromWindow() {
-		super.onDetachedFromWindow()
-		goneOnInvisibleListener.detach()
+	init {
+		bindingInfo.progressBar.setVisibilityAfterHide(View.GONE)
 	}
 
 	override fun onReady() {