1 /* <lambda>null2 * 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 18 package com.android.wallpaper.picker 19 20 import android.content.Context 21 import android.util.AttributeSet 22 import android.widget.FrameLayout 23 import androidx.core.view.children 24 import com.android.wallpaper.util.ScreenSizeCalculator 25 26 /** 27 * [FrameLayout] that sizes its children using a fixed aspect ratio that is the same as that of the 28 * display. 29 */ 30 class DisplayAspectRatioFrameLayout( 31 context: Context, 32 attrs: AttributeSet?, 33 ) : FrameLayout(context, attrs) { 34 35 override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) { 36 super.onMeasure(widthMeasureSpec, heightMeasureSpec) 37 val screenAspectRatio = ScreenSizeCalculator.getInstance().getScreenAspectRatio(context) 38 // We're always forcing the width based on the height. This will only work if the 39 // DisplayAspectRatioFrameLayout is allowed to stretch to fill its parent (for example if 40 // the parent is a vertical LinearLayout and the DisplayAspectRatioFrameLayout has a height 41 // if 0 and a weight of 1. 42 // 43 // If you need to use this class to force the height dimension based on the width instead, 44 // you will need to flip the logic below. 45 children.forEach { child -> 46 child.measure( 47 MeasureSpec.makeMeasureSpec( 48 (child.measuredHeight / screenAspectRatio).toInt(), 49 MeasureSpec.EXACTLY 50 ), 51 MeasureSpec.makeMeasureSpec( 52 child.measuredHeight, 53 MeasureSpec.EXACTLY, 54 ), 55 ) 56 } 57 } 58 } 59