1 /* 2 * Copyright (C) 2022 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.systemui.util 18 19 import android.content.Context 20 import android.util.AttributeSet 21 import android.view.Choreographer 22 import androidx.constraintlayout.motion.widget.MotionLayout 23 import com.android.app.tracing.traceSection 24 25 /** 26 * [MotionLayout] that avoids remeasuring with the same inputs in the same frame. 27 * 28 * This is important when this view is the child of a view that performs more than one measure pass 29 * (e.g. [LinearLayout] or [ConstraintLayout]). In those cases, if this view is measured with the 30 * same inputs in the same frame, we use the last result. 31 */ 32 class NoRemeasureMotionLayout @JvmOverloads constructor( 33 context: Context, 34 attrs: AttributeSet?, 35 defStyle: Int = 0 36 ) : MotionLayout(context, attrs, defStyle) { 37 38 private var lastWidthSpec: Int? = null 39 private var lastHeightSpec: Int? = null 40 private var lastFrame: Long? = null 41 onMeasurenull42 override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) { 43 if ( 44 lastWidthSpec == widthMeasureSpec && 45 lastHeightSpec == heightMeasureSpec && 46 Choreographer.getMainThreadInstance()?.frameTime == lastFrame 47 ) { 48 setMeasuredDimension(measuredWidth, measuredHeight) 49 return 50 } 51 traceSection("NoRemeasureMotionLayout - measure") { 52 super.onMeasure(widthMeasureSpec, heightMeasureSpec) 53 lastWidthSpec = widthMeasureSpec 54 lastHeightSpec = heightMeasureSpec 55 lastFrame = Choreographer.getMainThreadInstance()?.frameTime 56 } 57 } 58 } 59