1 /* 2 * Copyright (C) 2010 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 android.animation; 18 19 import android.animation.Keyframe.IntKeyframe; 20 21 import java.util.List; 22 23 /** 24 * This class holds a collection of IntKeyframe objects and is called by ValueAnimator to calculate 25 * values between those keyframes for a given animation. The class internal to the animation 26 * package because it is an implementation detail of how Keyframes are stored and used. 27 * 28 * <p>This type-specific subclass of KeyframeSet, along with the other type-specific subclass for 29 * float, exists to speed up the getValue() method when there is no custom 30 * TypeEvaluator set for the animation, so that values can be calculated without autoboxing to the 31 * Object equivalents of these primitive types.</p> 32 */ 33 class IntKeyframeSet extends KeyframeSet implements Keyframes.IntKeyframes { 34 private int firstValue; 35 private int lastValue; 36 private int deltaValue; 37 private boolean firstTime = true; 38 39 public IntKeyframeSet(IntKeyframe... keyframes) { 40 super(keyframes); 41 } 42 43 @Override 44 public Object getValue(float fraction) { 45 return getIntValue(fraction); 46 } 47 48 @Override 49 public IntKeyframeSet clone() { 50 List<Keyframe> keyframes = mKeyframes; 51 int numKeyframes = mKeyframes.size(); 52 IntKeyframe[] newKeyframes = new IntKeyframe[numKeyframes]; 53 for (int i = 0; i < numKeyframes; ++i) { 54 newKeyframes[i] = (IntKeyframe) keyframes.get(i).clone(); 55 } 56 IntKeyframeSet newSet = new IntKeyframeSet(newKeyframes); 57 return newSet; 58 } 59 60 @Override 61 public void invalidateCache() { 62 firstTime = true; 63 } 64 65 @Override 66 public int getIntValue(float fraction) { 67 if (mNumKeyframes == 2) { 68 if (firstTime) { 69 firstTime = false; 70 firstValue = ((IntKeyframe) mKeyframes.get(0)).getIntValue(); 71 lastValue = ((IntKeyframe) mKeyframes.get(1)).getIntValue(); 72 deltaValue = lastValue - firstValue; 73 } 74 if (mInterpolator != null) { 75 fraction = mInterpolator.getInterpolation(fraction); 76 } 77 if (mEvaluator == null) { 78 return firstValue + (int)(fraction * deltaValue); 79 } else { 80 return ((Number)mEvaluator.evaluate(fraction, firstValue, lastValue)).intValue(); 81 } 82 } 83 if (fraction <= 0f) { 84 final IntKeyframe prevKeyframe = (IntKeyframe) mKeyframes.get(0); 85 final IntKeyframe nextKeyframe = (IntKeyframe) mKeyframes.get(1); 86 int prevValue = prevKeyframe.getIntValue(); 87 int nextValue = nextKeyframe.getIntValue(); 88 float prevFraction = prevKeyframe.getFraction(); 89 float nextFraction = nextKeyframe.getFraction(); 90 final TimeInterpolator interpolator = nextKeyframe.getInterpolator(); 91 if (interpolator != null) { 92 fraction = interpolator.getInterpolation(fraction); 93 } 94 float intervalFraction = (fraction - prevFraction) / (nextFraction - prevFraction); 95 return mEvaluator == null ? 96 prevValue + (int)(intervalFraction * (nextValue - prevValue)) : 97 ((Number)mEvaluator.evaluate(intervalFraction, prevValue, nextValue)). 98 intValue(); 99 } else if (fraction >= 1f) { 100 final IntKeyframe prevKeyframe = (IntKeyframe) mKeyframes.get(mNumKeyframes - 2); 101 final IntKeyframe nextKeyframe = (IntKeyframe) mKeyframes.get(mNumKeyframes - 1); 102 int prevValue = prevKeyframe.getIntValue(); 103 int nextValue = nextKeyframe.getIntValue(); 104 float prevFraction = prevKeyframe.getFraction(); 105 float nextFraction = nextKeyframe.getFraction(); 106 final TimeInterpolator interpolator = nextKeyframe.getInterpolator(); 107 if (interpolator != null) { 108 fraction = interpolator.getInterpolation(fraction); 109 } 110 float intervalFraction = (fraction - prevFraction) / (nextFraction - prevFraction); 111 return mEvaluator == null ? 112 prevValue + (int)(intervalFraction * (nextValue - prevValue)) : 113 ((Number)mEvaluator.evaluate(intervalFraction, prevValue, nextValue)).intValue(); 114 } 115 IntKeyframe prevKeyframe = (IntKeyframe) mKeyframes.get(0); 116 for (int i = 1; i < mNumKeyframes; ++i) { 117 IntKeyframe nextKeyframe = (IntKeyframe) mKeyframes.get(i); 118 if (fraction < nextKeyframe.getFraction()) { 119 final TimeInterpolator interpolator = nextKeyframe.getInterpolator(); 120 float intervalFraction = (fraction - prevKeyframe.getFraction()) / 121 (nextKeyframe.getFraction() - prevKeyframe.getFraction()); 122 int prevValue = prevKeyframe.getIntValue(); 123 int nextValue = nextKeyframe.getIntValue(); 124 // Apply interpolator on the proportional duration. 125 if (interpolator != null) { 126 intervalFraction = interpolator.getInterpolation(intervalFraction); 127 } 128 return mEvaluator == null ? 129 prevValue + (int)(intervalFraction * (nextValue - prevValue)) : 130 ((Number)mEvaluator.evaluate(intervalFraction, prevValue, nextValue)). 131 intValue(); 132 } 133 prevKeyframe = nextKeyframe; 134 } 135 // shouldn't get here 136 return ((Number)mKeyframes.get(mNumKeyframes - 1).getValue()).intValue(); 137 } 138 139 @Override 140 public Class getType() { 141 return Integer.class; 142 } 143 } 144 145
