1 /* 2 * Copyright (C) 2023 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.animation.back 18 19 import android.view.View 20 21 /** 22 * This object that represents the transformation to apply to the target. The properties of this 23 * object are mutable for performance reasons (avoid recreating this object) 24 */ 25 data class BackTransformation( 26 var translateX: Float = Float.NaN, 27 var translateY: Float = Float.NaN, 28 var scale: Float = Float.NaN, 29 var scalePivotPosition: ScalePivotPosition? = null, 30 ) 31 32 /** Enum that describes the location of the scale pivot position */ 33 enum class ScalePivotPosition { 34 // more options may be added in the future 35 CENTER, 36 BOTTOM_CENTER; 37 applyTonull38 fun applyTo(view: View) { 39 val pivotX = 40 when (this) { 41 CENTER -> view.width / 2f 42 BOTTOM_CENTER -> view.width / 2f 43 } 44 val pivotY = 45 when (this) { 46 CENTER -> view.height / 2f 47 BOTTOM_CENTER -> view.height.toFloat() 48 } 49 view.pivotX = pivotX 50 view.pivotY = pivotY 51 } 52 } 53 54 /** Apply the transformation to the [targetView] */ applyTonull55fun BackTransformation.applyTo(targetView: View) { 56 if (translateX.isFinite()) targetView.translationX = translateX 57 if (translateY.isFinite()) targetView.translationY = translateY 58 scalePivotPosition?.applyTo(targetView) 59 if (scale.isFinite()) { 60 targetView.scaleX = scale 61 targetView.scaleY = scale 62 } 63 } 64