Option to lock reader screen rotation

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

@@ -6,13 +6,16 @@ import android.content.res.Configuration
 import android.database.ContentObserver
 import android.os.Handler
 import android.provider.Settings
+import dagger.hilt.android.scopes.ActivityScoped
 import kotlinx.coroutines.channels.awaitClose
 import kotlinx.coroutines.channels.trySendBlocking
 import kotlinx.coroutines.flow.callbackFlow
 import kotlinx.coroutines.flow.distinctUntilChanged
 import kotlinx.coroutines.flow.onStart
+import javax.inject.Inject
 
-class ScreenOrientationHelper(private val activity: Activity) {
+@ActivityScoped
+class ScreenOrientationHelper @Inject constructor(private val activity: Activity) {
 
 	val isAutoRotationEnabled: Boolean
 		get() = Settings.System.getInt(
@@ -31,9 +34,15 @@ class ScreenOrientationHelper(private val activity: Activity) {
 			}
 		}
 
-	fun toggleOrientation() {
-		isLandscape = !isLandscape
-	}
+	var isLocked: Boolean
+		get() = activity.requestedOrientation == ActivityInfo.SCREEN_ORIENTATION_LOCKED
+		set(value) {
+			activity.requestedOrientation = if (value) {
+				ActivityInfo.SCREEN_ORIENTATION_LOCKED
+			} else {
+				ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED
+			}
+		}
 
 	fun observeAutoOrientation() = callbackFlow {
 		val observer = object : ContentObserver(Handler(activity.mainLooper)) {

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

@@ -47,7 +47,10 @@ class ReaderConfigSheet :
 
 	private val viewModel by activityViewModels<ReaderViewModel>()
 	private val savePageRequest = registerForActivityResult(PageSaveContract(), this)
-	private var orientationHelper: ScreenOrientationHelper? = null
+
+	@Inject
+	lateinit var orientationHelper: ScreenOrientationHelper
+
 	private lateinit var mode: ReaderMode
 
 	@Inject
@@ -113,7 +116,7 @@ class ReaderConfigSheet :
 			}
 
 			R.id.button_screen_rotate -> {
-				orientationHelper?.toggleOrientation()
+				orientationHelper.isLandscape = !orientationHelper.isLandscape
 			}
 
 			R.id.button_color_filter -> {
@@ -131,6 +134,10 @@ class ReaderConfigSheet :
 				requireViewBinding().layoutTimer.isVisible = isChecked
 				requireViewBinding().sliderTimer.isVisible = isChecked
 			}
+
+			R.id.switch_screen_lock_rotation -> {
+				orientationHelper.isLocked = isChecked
+			}
 		}
 	}
 
@@ -168,14 +175,23 @@ class ReaderConfigSheet :
 	}
 
 	private fun observeScreenOrientation() {
-		val helper = ScreenOrientationHelper(requireActivity())
-		orientationHelper = helper
-		helper.observeAutoOrientation()
+		orientationHelper.observeAutoOrientation()
 			.onEach {
-				requireViewBinding().buttonScreenRotate.isGone = it
+				with(requireViewBinding()) {
+					buttonScreenRotate.isGone = it
+					switchScreenLockRotation.isVisible = it
+					updateOrientationLockSwitch()
+				}
 			}.launchIn(viewLifecycleScope)
 	}
 
+	private fun updateOrientationLockSwitch() {
+		val switch = viewBinding?.switchScreenLockRotation ?: return
+		switch.setOnCheckedChangeListener(null)
+		switch.isChecked = orientationHelper.isLocked
+		switch.setOnCheckedChangeListener(this)
+	}
+
 	private fun findCallback(): Callback? {
 		return (parentFragment as? Callback) ?: (activity as? Callback)
 	}

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

@@ -0,0 +1,11 @@
+<vector
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	android:width="24dp"
+	android:height="24dp"
+	android:tint="?colorControlNormal"
+	android:viewportWidth="24"
+	android:viewportHeight="24">
+	<path
+		android:fillColor="#000000"
+		android:pathData="M16.8,2.5C16.8,1.56 17.56,0.8 18.5,0.8C19.44,0.8 20.2,1.56 20.2,2.5V3H16.8V2.5M16,9H21A1,1 0 0,0 22,8V4A1,1 0 0,0 21,3V2.5A2.5,2.5 0 0,0 18.5,0A2.5,2.5 0 0,0 16,2.5V3A1,1 0 0,0 15,4V8A1,1 0 0,0 16,9M8.47,20.5C5.2,18.94 2.86,15.76 2.5,12H1C1.5,18.16 6.66,23 12.95,23L13.61,22.97L9.8,19.15L8.47,20.5M23.25,12.77L20.68,10.2L19.27,11.61L21.5,13.83L15.83,19.5L4.5,8.17L10.17,2.5L12.27,4.61L13.68,3.2L11.23,0.75C10.64,0.16 9.69,0.16 9.11,0.75L2.75,7.11C2.16,7.7 2.16,8.65 2.75,9.23L14.77,21.25C15.36,21.84 16.31,21.84 16.89,21.25L23.25,14.89C23.84,14.3 23.84,13.35 23.25,12.77Z" />
+</vector>

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

@@ -48,6 +48,22 @@
 				app:drawableStartCompat="@drawable/ic_screen_rotation"
 				tools:visibility="visible" />
 
+			<com.google.android.material.materialswitch.MaterialSwitch
+				android:id="@+id/switch_screen_lock_rotation"
+				android:layout_width="match_parent"
+				android:layout_height="?android:listPreferredItemHeightSmall"
+				android:drawablePadding="?android:listPreferredItemPaddingStart"
+				android:ellipsize="end"
+				android:paddingStart="?android:listPreferredItemPaddingStart"
+				android:paddingEnd="?android:listPreferredItemPaddingEnd"
+				android:singleLine="true"
+				android:text="@string/lock_screen_rotation"
+				android:textAppearance="?attr/textAppearanceButton"
+				android:textColor="?colorOnSurfaceVariant"
+				android:visibility="gone"
+				app:drawableStartCompat="@drawable/ic_screen_rotation_lock"
+				tools:visibility="visible" />
+
 			<TextView
 				android:layout_width="match_parent"
 				android:layout_height="wrap_content"

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

@@ -511,4 +511,5 @@
 	<string name="backups_output_directory">Backups output directory</string>
 	<string name="last_successful_backup">Last successful backup: %s</string>
 	<string name="speed_value">x%.1f</string>
+	<string name="lock_screen_rotation">Lock screen rotation</string>
 </resources>