Michael Jurka | e0523f7 | 2013-04-08 15:44:00 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 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.recent; |
| 18 | |
| 19 | import android.animation.Animator; |
| 20 | import android.animation.AnimatorListenerAdapter; |
| 21 | import android.animation.ValueAnimator; |
| 22 | import android.animation.Animator.AnimatorListener; |
| 23 | import android.util.Log; |
| 24 | import android.view.ViewTreeObserver; |
| 25 | import android.view.View; |
| 26 | import android.view.ViewPropertyAnimator; |
| 27 | |
| 28 | /* |
| 29 | * This is a helper class that listens to updates from the corresponding animation. |
| 30 | * For the first two frames, it adjusts the current play time of the animation to |
| 31 | * prevent jank at the beginning of the animation |
| 32 | */ |
| 33 | public class FirstFrameAnimatorHelper implements ValueAnimator.AnimatorUpdateListener { |
| 34 | private static final boolean DEBUG = false; |
| 35 | private static final int MAX_DELAY = 1000; |
| 36 | private static final int IDEAL_FRAME_DURATION = 16; |
| 37 | private View mTarget; |
| 38 | private long mStartFrame; |
| 39 | private long mStartTime = -1; |
| 40 | private boolean mHandlingOnAnimationUpdate; |
| 41 | private boolean mAdjustedSecondFrameTime; |
| 42 | |
| 43 | private static ViewTreeObserver.OnDrawListener sGlobalDrawListener; |
| 44 | private static long sGlobalFrameCounter; |
| 45 | |
| 46 | public FirstFrameAnimatorHelper(ValueAnimator animator, View target) { |
| 47 | mTarget = target; |
| 48 | animator.addUpdateListener(this); |
| 49 | } |
| 50 | |
| 51 | public FirstFrameAnimatorHelper(ViewPropertyAnimator vpa, View target) { |
| 52 | mTarget = target; |
| 53 | vpa.setListener(new AnimatorListenerAdapter() { |
| 54 | public void onAnimationStart (Animator animation) { |
| 55 | final ValueAnimator va = (ValueAnimator) animation; |
| 56 | va.addUpdateListener(FirstFrameAnimatorHelper.this); |
| 57 | onAnimationUpdate(va); |
| 58 | } |
| 59 | }); |
| 60 | } |
| 61 | |
| 62 | public static void initializeDrawListener(View view) { |
| 63 | if (sGlobalDrawListener != null) { |
| 64 | view.getViewTreeObserver().removeOnDrawListener(sGlobalDrawListener); |
| 65 | } |
| 66 | sGlobalDrawListener = new ViewTreeObserver.OnDrawListener() { |
| 67 | private long mTime = System.currentTimeMillis(); |
| 68 | public void onDraw() { |
| 69 | sGlobalFrameCounter++; |
| 70 | if (DEBUG) { |
| 71 | long newTime = System.currentTimeMillis(); |
| 72 | Log.d("FirstFrameAnimatorHelper", "TICK " + (newTime - mTime)); |
| 73 | mTime = newTime; |
| 74 | } |
| 75 | } |
| 76 | }; |
| 77 | view.getViewTreeObserver().addOnDrawListener(sGlobalDrawListener); |
| 78 | } |
| 79 | |
| 80 | public void onAnimationUpdate(final ValueAnimator animation) { |
| 81 | final long currentTime = System.currentTimeMillis(); |
| 82 | if (mStartTime == -1) { |
| 83 | mStartFrame = sGlobalFrameCounter; |
| 84 | mStartTime = currentTime; |
| 85 | } |
| 86 | |
| 87 | if (!mHandlingOnAnimationUpdate) { |
| 88 | mHandlingOnAnimationUpdate = true; |
| 89 | long frameNum = sGlobalFrameCounter - mStartFrame; |
| 90 | // If we haven't drawn our first frame, reset the time to t = 0 |
| 91 | // (give up after MAX_DELAY ms of waiting though - might happen, for example, if we |
| 92 | // are no longer in the foreground and no frames are being rendered ever) |
| 93 | if (frameNum == 0 && currentTime < mStartTime + MAX_DELAY) { |
| 94 | // The first frame on animations doesn't always trigger an invalidate... |
| 95 | // force an invalidate here to make sure the animation continues to advance |
| 96 | mTarget.getRootView().invalidate(); |
| 97 | animation.setCurrentPlayTime(0); |
| 98 | |
| 99 | // For the second frame, if the first frame took more than 16ms, |
| 100 | // adjust the start time and pretend it took only 16ms anyway. This |
| 101 | // prevents a large jump in the animation due to an expensive first frame |
| 102 | } else if (frameNum == 1 && currentTime < mStartTime + MAX_DELAY && |
| 103 | !mAdjustedSecondFrameTime && |
| 104 | currentTime > mStartTime + IDEAL_FRAME_DURATION) { |
| 105 | animation.setCurrentPlayTime(IDEAL_FRAME_DURATION); |
| 106 | mAdjustedSecondFrameTime = true; |
| 107 | } else { |
| 108 | if (frameNum > 1) { |
| 109 | mTarget.post(new Runnable() { |
| 110 | public void run() { |
| 111 | animation.removeUpdateListener(FirstFrameAnimatorHelper.this); |
| 112 | } |
| 113 | }); |
| 114 | } |
| 115 | if (DEBUG) print(animation); |
| 116 | } |
| 117 | mHandlingOnAnimationUpdate = false; |
| 118 | } else { |
| 119 | if (DEBUG) print(animation); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | public void print(ValueAnimator animation) { |
| 124 | float flatFraction = animation.getCurrentPlayTime() / (float) animation.getDuration(); |
| 125 | Log.d("FirstFrameAnimatorHelper", sGlobalFrameCounter + |
| 126 | "(" + (sGlobalFrameCounter - mStartFrame) + ") " + mTarget + " dirty? " + |
| 127 | mTarget.isDirty() + " " + flatFraction + " " + this + " " + animation); |
| 128 | } |
| 129 | } |