Prevent requestLayout() when updating drawables that don't change size

Fix: 354224963
Test: presubmits passing, manual
Flag: com.android.launcher3.enable_refactor_task_thumbnail
Change-Id: I31d9a51ed621f411bcafbb5bf885ee2587df057f

quickstep/res/layout/task_thumbnail.xml

@@ -19,19 +19,19 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent" >
 
-    <ImageView
+    <com.android.quickstep.views.FixedSizeImageView
         android:id="@+id/task_thumbnail"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:importantForAccessibility="no"
         android:scaleType="matrix"
-        android:visibility="gone"/>
+        android:visibility="invisible"/>
 
     <com.android.quickstep.task.thumbnail.LiveTileView
         android:id="@+id/task_thumbnail_live_tile"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
-        android:visibility="gone"/>
+        android:visibility="invisible"/>
 
     <View
         android:id="@+id/task_thumbnail_scrim"
@@ -44,10 +44,11 @@
         android:id="@+id/splash_background"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:background="@android:color/black"
         android:alpha="0"
         android:importantForAccessibility="no" />
 
-    <ImageView
+    <com.android.quickstep.views.FixedSizeImageView
         android:id="@+id/splash_icon"
         android:layout_width="@dimen/task_thumbnail_splash_icon_size"
         android:layout_height="@dimen/task_thumbnail_splash_icon_size"

quickstep/src/com/android/quickstep/task/thumbnail/TaskThumbnailView.kt

@@ -24,10 +24,9 @@ import android.graphics.Rect
 import android.util.AttributeSet
 import android.view.View
 import android.view.ViewOutlineProvider
-import android.widget.ImageView
 import androidx.annotation.ColorInt
 import androidx.constraintlayout.widget.ConstraintLayout
-import androidx.core.view.isVisible
+import androidx.core.view.isInvisible
 import com.android.launcher3.R
 import com.android.launcher3.Utilities
 import com.android.launcher3.util.ViewPool
@@ -40,6 +39,7 @@ import com.android.quickstep.task.thumbnail.TaskThumbnailUiState.SnapshotSplash
 import com.android.quickstep.task.thumbnail.TaskThumbnailUiState.Uninitialized
 import com.android.quickstep.task.viewmodel.TaskThumbnailViewModel
 import com.android.quickstep.util.TaskCornerRadius
+import com.android.quickstep.views.FixedSizeImageView
 import com.android.systemui.shared.system.QuickStepContract
 import kotlin.math.abs
 import kotlinx.coroutines.CoroutineName
@@ -59,9 +59,9 @@ class TaskThumbnailView : ConstraintLayout, ViewPool.Reusable {
 
     private val scrimView: View by lazy { findViewById(R.id.task_thumbnail_scrim) }
     private val liveTileView: LiveTileView by lazy { findViewById(R.id.task_thumbnail_live_tile) }
-    private val thumbnailView: ImageView by lazy { findViewById(R.id.task_thumbnail) }
+    private val thumbnailView: FixedSizeImageView by lazy { findViewById(R.id.task_thumbnail) }
     private val splashBackground: View by lazy { findViewById(R.id.splash_background) }
-    private val splashIcon: ImageView by lazy { findViewById(R.id.splash_icon) }
+    private val splashIcon: FixedSizeImageView by lazy { findViewById(R.id.splash_icon) }
 
     private var uiState: TaskThumbnailUiState = Uninitialized
     private var inheritedScale: Float = 1f
@@ -173,8 +173,8 @@ class TaskThumbnailView : ConstraintLayout, ViewPool.Reusable {
     }
 
     private fun resetViews() {
-        liveTileView.isVisible = false
-        thumbnailView.isVisible = false
+        liveTileView.isInvisible = true
+        thumbnailView.isInvisible = true
         splashBackground.alpha = 0f
         splashIcon.alpha = 0f
         scrimView.alpha = 0f
@@ -186,7 +186,7 @@ class TaskThumbnailView : ConstraintLayout, ViewPool.Reusable {
     }
 
     private fun drawLiveWindow() {
-        liveTileView.isVisible = true
+        liveTileView.isInvisible = false
     }
 
     private fun drawSnapshotSplash(snapshotSplash: SnapshotSplash) {
@@ -199,7 +199,7 @@ class TaskThumbnailView : ConstraintLayout, ViewPool.Reusable {
     private fun drawSnapshot(snapshot: Snapshot) {
         drawBackground(snapshot.backgroundColor)
         thumbnailView.setImageBitmap(snapshot.bitmap)
-        thumbnailView.isVisible = true
+        thumbnailView.isInvisible = false
         setImageMatrix()
     }
 

quickstep/src/com/android/quickstep/views/FixedSizeImageView.kt

@@ -0,0 +1,56 @@
+/*
+ * Copyright (C) 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.quickstep.views
+
+import android.annotation.SuppressLint
+import android.content.Context
+import android.util.AttributeSet
+import android.view.ViewGroup
+import android.widget.ImageView
+
+/**
+ * An [ImageView] that does not requestLayout() unless setLayoutParams is called.
+ *
+ * This is useful, particularly during animations, for [ImageView]s that are not supposed to be
+ * resized.
+ */
+@SuppressLint("AppCompatCustomView")
+class FixedSizeImageView : ImageView {
+    private var shouldRequestLayoutOnChanges = false
+
+    constructor(context: Context) : super(context)
+
+    constructor(context: Context, attrs: AttributeSet?) : super(context, attrs)
+
+    constructor(
+        context: Context,
+        attrs: AttributeSet?,
+        defStyleAttr: Int,
+    ) : super(context, attrs, defStyleAttr)
+
+    override fun setLayoutParams(params: ViewGroup.LayoutParams?) {
+        shouldRequestLayoutOnChanges = true
+        super.setLayoutParams(params)
+        shouldRequestLayoutOnChanges = false
+    }
+
+    override fun requestLayout() {
+        if (shouldRequestLayoutOnChanges) {
+            super.requestLayout()
+        }
+    }
+}