Joshua Tsuji | 06785ab | 2020-06-08 11:18:40 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2020 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 | package com.android.systemui.bubbles.animation; |
| 17 | |
| 18 | import android.graphics.Matrix; |
| 19 | |
| 20 | import androidx.dynamicanimation.animation.DynamicAnimation; |
| 21 | import androidx.dynamicanimation.animation.FloatPropertyCompat; |
| 22 | |
| 23 | /** |
| 24 | * Matrix whose scale properties can be animated using physics animations, via the {@link #SCALE_X} |
| 25 | * and {@link #SCALE_Y} FloatProperties. |
| 26 | * |
| 27 | * This is useful when you need to perform a scale animation with a pivot point, since pivot points |
| 28 | * are not supported by standard View scale operations but are supported by matrices. |
| 29 | * |
| 30 | * NOTE: DynamicAnimation assumes that all custom properties are denominated in pixels, and thus |
| 31 | * considers 1 to be the smallest user-visible change for custom properties. This means that if you |
| 32 | * animate {@link #SCALE_X} and {@link #SCALE_Y} to 3f, for example, the animation would have only |
| 33 | * three frames. |
| 34 | * |
| 35 | * To work around this, whenever animating to a desired scale value, animate to the value returned |
| 36 | * by {@link #getAnimatableValueForScaleFactor} instead. The SCALE_X and SCALE_Y properties will |
| 37 | * convert that (larger) value into the appropriate scale factor when scaling the matrix. |
| 38 | */ |
| 39 | public class AnimatableScaleMatrix extends Matrix { |
| 40 | |
| 41 | /** |
| 42 | * The X value of the scale. |
| 43 | * |
| 44 | * NOTE: This must be set or animated to the value returned by |
| 45 | * {@link #getAnimatableValueForScaleFactor}, not the desired scale factor itself. |
| 46 | */ |
| 47 | public static final FloatPropertyCompat<AnimatableScaleMatrix> SCALE_X = |
| 48 | new FloatPropertyCompat<AnimatableScaleMatrix>("matrixScaleX") { |
| 49 | @Override |
| 50 | public float getValue(AnimatableScaleMatrix object) { |
| 51 | return getAnimatableValueForScaleFactor(object.mScaleX); |
| 52 | } |
| 53 | |
| 54 | @Override |
| 55 | public void setValue(AnimatableScaleMatrix object, float value) { |
| 56 | object.setScaleX(value * DynamicAnimation.MIN_VISIBLE_CHANGE_SCALE); |
| 57 | } |
| 58 | }; |
| 59 | |
| 60 | /** |
| 61 | * The Y value of the scale. |
| 62 | * |
| 63 | * NOTE: This must be set or animated to the value returned by |
| 64 | * {@link #getAnimatableValueForScaleFactor}, not the desired scale factor itself. |
| 65 | */ |
| 66 | public static final FloatPropertyCompat<AnimatableScaleMatrix> SCALE_Y = |
| 67 | new FloatPropertyCompat<AnimatableScaleMatrix>("matrixScaleY") { |
| 68 | @Override |
| 69 | public float getValue(AnimatableScaleMatrix object) { |
| 70 | return getAnimatableValueForScaleFactor(object.mScaleY); |
| 71 | } |
| 72 | |
| 73 | @Override |
| 74 | public void setValue(AnimatableScaleMatrix object, float value) { |
| 75 | object.setScaleY(value * DynamicAnimation.MIN_VISIBLE_CHANGE_SCALE); |
| 76 | } |
| 77 | }; |
| 78 | |
| 79 | private float mScaleX = 1f; |
| 80 | private float mScaleY = 1f; |
| 81 | |
| 82 | private float mPivotX = 0f; |
| 83 | private float mPivotY = 0f; |
| 84 | |
| 85 | /** |
| 86 | * Return the value to animate SCALE_X or SCALE_Y to in order to achieve the desired scale |
| 87 | * factor. |
| 88 | */ |
| 89 | public static float getAnimatableValueForScaleFactor(float scale) { |
| 90 | return scale * (1f / DynamicAnimation.MIN_VISIBLE_CHANGE_SCALE); |
| 91 | } |
| 92 | |
| 93 | @Override |
| 94 | public void setScale(float sx, float sy, float px, float py) { |
| 95 | mScaleX = sx; |
| 96 | mScaleY = sy; |
| 97 | mPivotX = px; |
| 98 | mPivotY = py; |
| 99 | super.setScale(mScaleX, mScaleY, mPivotX, mPivotY); |
| 100 | } |
| 101 | |
| 102 | public void setScaleX(float scaleX) { |
| 103 | mScaleX = scaleX; |
| 104 | super.setScale(mScaleX, mScaleY, mPivotX, mPivotY); |
| 105 | } |
| 106 | |
| 107 | public void setScaleY(float scaleY) { |
| 108 | mScaleY = scaleY; |
| 109 | super.setScale(mScaleX, mScaleY, mPivotX, mPivotY); |
| 110 | } |
| 111 | |
| 112 | public void setPivotX(float pivotX) { |
| 113 | mPivotX = pivotX; |
| 114 | super.setScale(mScaleX, mScaleY, mPivotX, mPivotY); |
| 115 | } |
| 116 | |
| 117 | public void setPivotY(float pivotY) { |
| 118 | mPivotY = pivotY; |
| 119 | super.setScale(mScaleX, mScaleY, mPivotX, mPivotY); |
| 120 | } |
| 121 | |
| 122 | public float getScaleX() { |
| 123 | return mScaleX; |
| 124 | } |
| 125 | |
| 126 | public float getScaleY() { |
| 127 | return mScaleY; |
| 128 | } |
| 129 | |
| 130 | public float getPivotX() { |
| 131 | return mPivotX; |
| 132 | } |
| 133 | |
| 134 | public float getPivotY() { |
| 135 | return mPivotY; |
| 136 | } |
| 137 | } |