Information toast in reader

app/src/main/java/org/koitharu/kotatsu/reader/ui/ReaderActivity.kt

@@ -86,7 +86,7 @@ class ReaderActivity : BaseFullscreenActivity<ActivityReaderBinding>(),
 		viewModel.onError.observe(this, this::onError)
 		viewModel.readerMode.observe(this, this::onInitReader)
 		viewModel.onPageSaved.observe(this, this::onPageSaved)
-		viewModel.uiState.observe(this, this::onUiStateChanged)
+		viewModel.uiState.observeWithPrevious(this, this::onUiStateChanged)
 		viewModel.isLoading.observe(this, this::onLoadingStateChanged)
 		viewModel.content.observe(this) {
 			onLoadingStateChanged(viewModel.isLoading.value == true)
@@ -204,7 +204,11 @@ class ReaderActivity : BaseFullscreenActivity<ActivityReaderBinding>(),
 	private fun onLoadingStateChanged(isLoading: Boolean) {
 		val hasPages = !viewModel.content.value?.pages.isNullOrEmpty()
 		binding.layoutLoading.isVisible = isLoading && !hasPages
-		binding.progressBarBottom.isVisible = isLoading && hasPages
+		if (isLoading && hasPages) {
+			binding.toastView.show(R.string.loading_, true)
+		} else {
+			binding.toastView.hide()
+		}
 	}
 
 	private fun onError(e: Throwable) {
@@ -336,19 +340,25 @@ class ReaderActivity : BaseFullscreenActivity<ActivityReaderBinding>(),
 		setUiIsVisible(!binding.appbarTop.isVisible)
 	}
 
-	private fun onUiStateChanged(uiState: ReaderUiState) {
+	private fun onUiStateChanged(uiState: ReaderUiState, previous: ReaderUiState?) {
 		title = uiState.chapterName ?: uiState.mangaName ?: getString(R.string.loading_)
 		supportActionBar?.subtitle = if (uiState.chapterNumber in 1..uiState.chaptersTotal) {
 			getString(R.string.chapter_d_of_d, uiState.chapterNumber, uiState.chaptersTotal)
 		} else {
 			null
 		}
+		if (previous?.chapterName != null && uiState.chapterName != previous.chapterName) {
+			if (!uiState.chapterName.isNullOrEmpty()) {
+				binding.toastView.showTemporary(uiState.chapterName, TOAST_DURATION)
+			}
+		}
 	}
 
 	companion object {
 
 		const val ACTION_MANGA_READ = "${BuildConfig.APPLICATION_ID}.action.READ_MANGA"
 		private const val EXTRA_STATE = "state"
+		private const val TOAST_DURATION = 1500L
 
 		fun newIntent(context: Context, manga: Manga, state: ReaderState?): Intent {
 			return Intent(context, ReaderActivity::class.java)

app/src/main/java/org/koitharu/kotatsu/reader/ui/ReaderToastView.kt

@@ -0,0 +1,56 @@
+package org.koitharu.kotatsu.reader.ui
+
+import android.content.Context
+import android.graphics.Color
+import android.util.AttributeSet
+import androidx.annotation.StringRes
+import androidx.swiperefreshlayout.widget.CircularProgressDrawable
+import com.google.android.material.textview.MaterialTextView
+import org.koitharu.kotatsu.utils.anim.Duration
+import org.koitharu.kotatsu.utils.anim.Motion
+import org.koitharu.kotatsu.utils.ext.hideAnimated
+import org.koitharu.kotatsu.utils.ext.showAnimated
+
+class ReaderToastView @JvmOverloads constructor(
+	context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
+) : MaterialTextView(context, attrs, defStyleAttr) {
+
+	private var hideRunnable = Runnable {
+		hide()
+	}
+
+	fun show(message: CharSequence, isLoading: Boolean) {
+		removeCallbacks(hideRunnable)
+		text = message
+		this.showAnimated(Motion.Toast, Duration.SHORT)
+	}
+
+	fun show(@StringRes messageId: Int, isLoading: Boolean) {
+		show(context.getString(messageId), isLoading)
+	}
+
+	fun showTemporary(message: CharSequence, duration: Long) {
+		show(message, false)
+		postDelayed(hideRunnable, duration)
+	}
+
+	fun hide() {
+		removeCallbacks(hideRunnable)
+		this.hideAnimated(Motion.Toast, Duration.SHORT)
+	}
+
+	override fun onDetachedFromWindow() {
+		removeCallbacks(hideRunnable)
+		super.onDetachedFromWindow()
+	}
+
+	// FIXME use it as compound drawable
+	private fun createProgressDrawable(): CircularProgressDrawable {
+		val drawable = CircularProgressDrawable(context)
+		drawable.setStyle(CircularProgressDrawable.DEFAULT)
+		drawable.arrowEnabled = false
+		drawable.setColorSchemeColors(Color.WHITE)
+		drawable.centerRadius = lineHeight / 3f
+		return drawable
+	}
+}

app/src/main/java/org/koitharu/kotatsu/utils/anim/Motion.kt

@@ -2,7 +2,8 @@ package org.koitharu.kotatsu.utils.anim
 
 import android.view.View
 import android.view.ViewPropertyAnimator
-import android.view.animation.AccelerateDecelerateInterpolator
+import android.view.animation.AccelerateInterpolator
+import android.view.animation.DecelerateInterpolator
 import org.koitharu.kotatsu.utils.ext.measureHeight
 
 sealed class Motion {
@@ -69,27 +70,25 @@ sealed class Motion {
 		}
 	}
 
-	object CheckEffect : Motion() {
+	object Toast : Motion() {
 		override fun reset(v: View) {
-			v.scaleX = 1f
-			v.scaleY = 1f
+			v.alpha = 1f
 		}
 
 		override fun hideView(v: View) {
-			v.scaleX = 0f
-			v.scaleY = 0f
+			v.alpha = 0f
 		}
 
 		override fun hide(v: View, anim: ViewPropertyAnimator) {
-			anim.scaleX(0f)
-			anim.scaleY(0f)
-			anim.interpolator = AccelerateDecelerateInterpolator()
+			anim.alpha(0f)
+			anim.translationY(v.measureHeight().toFloat())
+			anim.interpolator = AccelerateInterpolator()
 		}
 
 		override fun show(v: View, anim: ViewPropertyAnimator) {
-			anim.scaleY(1f)
-			anim.scaleX(1f)
-			anim.interpolator = AccelerateDecelerateInterpolator()
+			anim.alpha(1f)
+			anim.translationY(0f)
+			anim.interpolator = DecelerateInterpolator()
 		}
 	}
 }

app/src/main/java/org/koitharu/kotatsu/utils/ext/TextViewExt.kt

@@ -0,0 +1,20 @@
+package org.koitharu.kotatsu.utils.ext
+
+import android.graphics.drawable.Drawable
+import android.view.View
+import android.widget.TextView
+import androidx.core.view.isGone
+
+var TextView.textAndVisible: CharSequence?
+	inline get() = text?.takeIf { visibility == View.VISIBLE }
+	set(value) {
+		text = value
+		isGone = value.isNullOrEmpty()
+	}
+
+var TextView.drawableStart: Drawable?
+	inline get() = compoundDrawablesRelative[0]
+	set(value) {
+		val dr = compoundDrawablesRelative
+		setCompoundDrawablesRelativeWithIntrinsicBounds(value, dr[1], dr[2], dr[3])
+	}

app/src/main/java/org/koitharu/kotatsu/utils/ext/ViewExt.kt

@@ -40,13 +40,6 @@ inline fun <reified T : View> ViewGroup.inflate(@LayoutRes resId: Int) =
 val RecyclerView.hasItems: Boolean
 	get() = (adapter?.itemCount ?: 0) > 0
 
-var TextView.textAndVisible: CharSequence?
-	get() = text?.takeIf { visibility == View.VISIBLE }
-	set(value) {
-		text = value
-		isGone = value.isNullOrEmpty()
-	}
-
 inline fun <T> ChipGroup.addChips(data: Iterable<T>, action: ChipsFactory.(T) -> Chip) {
 	val factory = ChipsFactory(context)
 	data.forEach {

app/src/main/res/drawable/bg_reader_indicator.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+	android:shape="rectangle">
+	<corners android:radius="16dp" />
+	<solid android:color="@color/dim" />
+	<padding
+		android:bottom="8dp"
+		android:left="12dp"
+		android:right="12dp"
+		android:top="8dp" />
+</shape>

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

@@ -2,6 +2,7 @@
 <FrameLayout
 	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"
 	android:keepScreenOn="true">
@@ -11,14 +12,19 @@
 		android:layout_width="match_parent"
 		android:layout_height="match_parent" />
 
-	<ProgressBar
-		android:id="@+id/progressBar_bottom"
-		android:layout_width="match_parent"
+	<org.koitharu.kotatsu.reader.ui.ReaderToastView
+		android:id="@+id/toastView"
+		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
-		android:indeterminate="true"
-		android:layout_gravity="bottom"
+		android:layout_gravity="bottom|center_horizontal"
 		android:layout_marginBottom="20dp"
-		style="@style/Widget.AppCompat.ProgressBar.Horizontal" />
+		android:background="@drawable/bg_reader_indicator"
+		android:singleLine="true"
+		android:drawablePadding="6dp"
+		android:textAppearance="?android:textAppearanceSmall"
+		android:textColor="?android:textColorPrimary"
+		android:theme="@style/ThemeOverlay.MaterialComponents.Dark"
+		tools:text="@string/loading_" />
 
 	<com.google.android.material.appbar.AppBarLayout
 		android:id="@+id/appbar_top"
@@ -45,7 +51,8 @@
 		android:background="@color/dim"
 		android:elevation="0dp"
 		android:theme="@style/AppToolbarTheme"
-		app:elevation="0dp">
+		app:elevation="0dp"
+		tools:visibility="gone">
 
 		<com.google.android.material.appbar.MaterialToolbar
 			android:id="@+id/toolbar_bottom"