1 /* 2 * Copyright (C) 2012 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.launcher3; 18 19 import android.animation.Animator; 20 import android.animation.AnimatorSet; 21 import android.animation.ObjectAnimator; 22 import android.animation.PropertyValuesHolder; 23 import android.animation.ValueAnimator; 24 import android.graphics.drawable.Drawable; 25 import android.util.Property; 26 import android.view.View; 27 import android.view.ViewTreeObserver; 28 29 import java.util.HashSet; 30 import java.util.WeakHashMap; 31 32 public class LauncherAnimUtils { 33 /** 34 * Durations for various state animations. These are not defined in resources to allow 35 * easier access from static classes and enums 36 */ 37 public static final int ALL_APPS_TRANSITION_MS = 320; 38 public static final int OVERVIEW_TRANSITION_MS = 250; 39 public static final int SPRING_LOADED_TRANSITION_MS = 150; 40 public static final int SPRING_LOADED_EXIT_DELAY = 500; 41 42 // The progress of an animation to all apps must be at least this far along to snap to all apps. 43 public static final float MIN_PROGRESS_TO_ALL_APPS = 0.5f; 44 45 static WeakHashMap<Animator, Object> sAnimators = new WeakHashMap<Animator, Object>(); 46 static Animator.AnimatorListener sEndAnimListener = new Animator.AnimatorListener() { 47 public void onAnimationStart(Animator animation) { 48 sAnimators.put(animation, null); 49 } 50 51 public void onAnimationRepeat(Animator animation) { 52 } 53 54 public void onAnimationEnd(Animator animation) { 55 sAnimators.remove(animation); 56 } 57 58 public void onAnimationCancel(Animator animation) { 59 sAnimators.remove(animation); 60 } 61 }; 62 cancelOnDestroyActivity(Animator a)63 public static void cancelOnDestroyActivity(Animator a) { 64 a.addListener(sEndAnimListener); 65 } 66 67 // Helper method. Assumes a draw is pending, and that if the animation's duration is 0 68 // it should be cancelled startAnimationAfterNextDraw(final Animator animator, final View view)69 public static void startAnimationAfterNextDraw(final Animator animator, final View view) { 70 view.getViewTreeObserver().addOnDrawListener(new ViewTreeObserver.OnDrawListener() { 71 private boolean mStarted = false; 72 73 public void onDraw() { 74 if (mStarted) return; 75 mStarted = true; 76 // Use this as a signal that the animation was cancelled 77 if (animator.getDuration() == 0) { 78 return; 79 } 80 animator.start(); 81 82 final ViewTreeObserver.OnDrawListener listener = this; 83 view.post(new Runnable() { 84 public void run() { 85 view.getViewTreeObserver().removeOnDrawListener(listener); 86 } 87 }); 88 } 89 }); 90 } 91 onDestroyActivity()92 public static void onDestroyActivity() { 93 HashSet<Animator> animators = new HashSet<Animator>(sAnimators.keySet()); 94 for (Animator a : animators) { 95 if (a.isRunning()) { 96 a.cancel(); 97 } 98 sAnimators.remove(a); 99 } 100 } 101 createAnimatorSet()102 public static AnimatorSet createAnimatorSet() { 103 AnimatorSet anim = new AnimatorSet(); 104 cancelOnDestroyActivity(anim); 105 return anim; 106 } 107 ofFloat(float... values)108 public static ValueAnimator ofFloat(float... values) { 109 ValueAnimator anim = new ValueAnimator(); 110 anim.setFloatValues(values); 111 cancelOnDestroyActivity(anim); 112 return anim; 113 } 114 ofFloat(View target, Property<View, Float> property, float... values)115 public static ObjectAnimator ofFloat(View target, Property<View, Float> property, 116 float... values) { 117 ObjectAnimator anim = ObjectAnimator.ofFloat(target, property, values); 118 cancelOnDestroyActivity(anim); 119 new FirstFrameAnimatorHelper(anim, target); 120 return anim; 121 } 122 ofViewAlphaAndScale(View target, float alpha, float scaleX, float scaleY)123 public static ObjectAnimator ofViewAlphaAndScale(View target, 124 float alpha, float scaleX, float scaleY) { 125 return ofPropertyValuesHolder(target, 126 PropertyValuesHolder.ofFloat(View.ALPHA, alpha), 127 PropertyValuesHolder.ofFloat(View.SCALE_X, scaleX), 128 PropertyValuesHolder.ofFloat(View.SCALE_Y, scaleY)); 129 } 130 ofPropertyValuesHolder(View target, PropertyValuesHolder... values)131 public static ObjectAnimator ofPropertyValuesHolder(View target, 132 PropertyValuesHolder... values) { 133 return ofPropertyValuesHolder(target, target, values); 134 } 135 ofPropertyValuesHolder(Object target, View view, PropertyValuesHolder... values)136 public static ObjectAnimator ofPropertyValuesHolder(Object target, 137 View view, PropertyValuesHolder... values) { 138 ObjectAnimator anim = ObjectAnimator.ofPropertyValuesHolder(target, values); 139 cancelOnDestroyActivity(anim); 140 new FirstFrameAnimatorHelper(anim, view); 141 return anim; 142 } 143 144 public static final Property<Drawable, Integer> DRAWABLE_ALPHA = 145 new Property<Drawable, Integer>(Integer.TYPE, "drawableAlpha") { 146 @Override 147 public Integer get(Drawable drawable) { 148 return drawable.getAlpha(); 149 } 150 151 @Override 152 public void set(Drawable drawable, Integer alpha) { 153 drawable.setAlpha(alpha); 154 } 155 }; 156 157 public static final Property<View, Float> SCALE_PROPERTY = 158 new Property<View, Float>(Float.class, "scale") { 159 @Override 160 public Float get(View view) { 161 return view.getScaleX(); 162 } 163 164 @Override 165 public void set(View view, Float scale) { 166 view.setScaleX(scale); 167 view.setScaleY(scale); 168 } 169 }; 170 171 /** Increase the duration if we prevented the fling, as we are going against a high velocity. */ blockedFlingDurationFactor(float velocity)172 public static int blockedFlingDurationFactor(float velocity) { 173 return (int) Utilities.boundToRange(Math.abs(velocity) / 2, 2f, 6f); 174 } 175 } 176