Fix reader immersive mode

app/src/main/java/org/koitharu/kotatsu/base/ui/BaseFullscreenActivity.kt

@@ -3,37 +3,55 @@ package org.koitharu.kotatsu.base.ui
 import android.graphics.Color
 import android.os.Build
 import android.os.Bundle
+import android.view.View
 import android.view.WindowManager
-import androidx.core.view.WindowInsetsCompat
-import androidx.core.view.WindowInsetsControllerCompat
 import androidx.viewbinding.ViewBinding
 
 
-abstract class BaseFullscreenActivity<B : ViewBinding> : BaseActivity<B>() {
-
-	private lateinit var insetsControllerCompat: WindowInsetsControllerCompat
+abstract class BaseFullscreenActivity<B : ViewBinding> : BaseActivity<B>(),
+	View.OnSystemUiVisibilityChangeListener {
 
 	override fun onCreate(savedInstanceState: Bundle?) {
 		super.onCreate(savedInstanceState)
 		with(window) {
-			insetsControllerCompat = WindowInsetsControllerCompat(this, decorView)
-			insetsControllerCompat.systemBarsBehavior =
-				WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
 			statusBarColor = Color.TRANSPARENT
 			navigationBarColor = Color.TRANSPARENT
 			if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
 				attributes.layoutInDisplayCutoutMode =
 					WindowManager.LayoutParams.LAYOUT_IN_DISPLAY_CUTOUT_MODE_SHORT_EDGES
 			}
+			decorView.setOnSystemUiVisibilityChangeListener(this@BaseFullscreenActivity)
 		}
 		showSystemUI()
 	}
 
+	final override fun onSystemUiVisibilityChange(visibility: Int) {
+		onSystemUiVisibilityChanged(visibility and View.SYSTEM_UI_FLAG_FULLSCREEN == 0)
+	}
+
+	// TODO WindowInsetsControllerCompat works incorrect
 	protected fun hideSystemUI() {
-		insetsControllerCompat.hide(WindowInsetsCompat.Type.systemBars())
+		window.decorView.systemUiVisibility = SYSTEM_UI_FLAGS_HIDDEN
 	}
 
 	protected fun showSystemUI() {
-		insetsControllerCompat.show(WindowInsetsCompat.Type.systemBars())
+		window.decorView.systemUiVisibility = SYSTEM_UI_FLAGS_SHOWN
+	}
+
+	protected open fun onSystemUiVisibilityChanged(isVisible: Boolean) = Unit
+
+	@Suppress("DEPRECATION")
+	private companion object {
+
+		const val SYSTEM_UI_FLAGS_SHOWN = View.SYSTEM_UI_FLAG_LAYOUT_STABLE or
+				View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION or
+				View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
+
+		const val SYSTEM_UI_FLAGS_HIDDEN = View.SYSTEM_UI_FLAG_LAYOUT_STABLE or
+				View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION or
+				View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN or
+				View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or
+				View.SYSTEM_UI_FLAG_FULLSCREEN or
+				View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
 	}
 }