Yet another attempt to make webtoon reader great again

app/src/main/java/org/koitharu/kotatsu/utils/GoneOnInvisibleListener.kt

@@ -0,0 +1,23 @@
+package org.koitharu.kotatsu.utils
+
+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)
+	}
+}

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

@@ -1,6 +1,8 @@
 package org.koitharu.kotatsu.utils.ext
 
+import android.app.ActivityManager
 import android.content.Context
+import android.content.Context.ACTIVITY_SERVICE
 import android.content.SharedPreferences
 import android.content.pm.ResolveInfo
 import android.net.ConnectivityManager
@@ -27,6 +29,9 @@ import kotlinx.coroutines.suspendCancellableCoroutine
 val Context.connectivityManager: ConnectivityManager
 	get() = getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
 
+val Context.activityManager: ActivityManager?
+	get() = getSystemService(ACTIVITY_SERVICE) as? ActivityManager
+
 suspend fun ConnectivityManager.waitForNetwork(): Network {
 	val request = NetworkRequest.Builder().build()
 	if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
@@ -92,4 +97,8 @@ fun Lifecycle.postDelayed(runnable: Runnable, delay: Long) {
 		delay(delay)
 		runnable.run()
 	}
+}
+
+fun isLowRamDevice(context: Context): Boolean {
+	return context.activityManager?.isLowRamDevice ?: false
 }

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

@@ -4,6 +4,7 @@ import android.app.Activity
 import android.graphics.Rect
 import android.view.View
 import android.view.ViewGroup
+import android.view.ViewParent
 import android.view.inputmethod.InputMethodManager
 import androidx.core.view.children
 import androidx.recyclerview.widget.LinearLayoutManager
@@ -138,4 +139,13 @@ fun <T : View> ViewGroup.findViewsByType(clazz: Class<T>): Sequence<T> {
 			}
 		}
 	}
-}
+}
+
+val View.parents: Sequence<ViewParent>
+	get() = sequence {
+		var p: ViewParent? = parent
+		while (p != null) {
+			yield(p)
+			p = p.parent
+		}
+	}