| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.animation; |
| |
| import android.animation.Keyframe.FloatKeyframe; |
| |
| import java.util.ArrayList; |
| |
| /** |
| * This class holds a collection of FloatKeyframe objects and is called by ValueAnimator to calculate |
| * values between those keyframes for a given animation. The class internal to the animation |
| * package because it is an implementation detail of how Keyframes are stored and used. |
| * |
| * <p>This type-specific subclass of KeyframeSet, along with the other type-specific subclass for |
| * int, exists to speed up the getValue() method when there is no custom |
| * TypeEvaluator set for the animation, so that values can be calculated without autoboxing to the |
| * Object equivalents of these primitive types.</p> |
| */ |
| class FloatKeyframeSet extends KeyframeSet { |
| private float firstValue; |
| private float lastValue; |
| private float deltaValue; |
| private boolean firstTime = true; |
| |
| public FloatKeyframeSet(FloatKeyframe... keyframes) { |
| super(keyframes); |
| } |
| |
| @Override |
| public Object getValue(float fraction) { |
| return getFloatValue(fraction); |
| } |
| |
| @Override |
| public FloatKeyframeSet clone() { |
| ArrayList<Keyframe> keyframes = mKeyframes; |
| int numKeyframes = mKeyframes.size(); |
| FloatKeyframe[] newKeyframes = new FloatKeyframe[numKeyframes]; |
| for (int i = 0; i < numKeyframes; ++i) { |
| newKeyframes[i] = (FloatKeyframe) keyframes.get(i).clone(); |
| } |
| FloatKeyframeSet newSet = new FloatKeyframeSet(newKeyframes); |
| return newSet; |
| } |
| |
| public float getFloatValue(float fraction) { |
| if (mNumKeyframes == 2) { |
| if (firstTime) { |
| firstTime = false; |
| firstValue = ((FloatKeyframe) mKeyframes.get(0)).getFloatValue(); |
| lastValue = ((FloatKeyframe) mKeyframes.get(1)).getFloatValue(); |
| deltaValue = lastValue - firstValue; |
| } |
| if (mInterpolator != null) { |
| fraction = mInterpolator.getInterpolation(fraction); |
| } |
| if (mEvaluator == null) { |
| return firstValue + fraction * deltaValue; |
| } else { |
| return ((Number)mEvaluator.evaluate(fraction, firstValue, lastValue)).floatValue(); |
| } |
| } |
| if (fraction <= 0f) { |
| final FloatKeyframe prevKeyframe = (FloatKeyframe) mKeyframes.get(0); |
| final FloatKeyframe nextKeyframe = (FloatKeyframe) mKeyframes.get(1); |
| float prevValue = prevKeyframe.getFloatValue(); |
| float nextValue = nextKeyframe.getFloatValue(); |
| float prevFraction = prevKeyframe.getFraction(); |
| float nextFraction = nextKeyframe.getFraction(); |
| final TimeInterpolator interpolator = nextKeyframe.getInterpolator(); |
| if (interpolator != null) { |
| fraction = interpolator.getInterpolation(fraction); |
| } |
| float intervalFraction = (fraction - prevFraction) / (nextFraction - prevFraction); |
| return mEvaluator == null ? |
| prevValue + intervalFraction * (nextValue - prevValue) : |
| ((Number)mEvaluator.evaluate(intervalFraction, prevValue, nextValue)). |
| floatValue(); |
| } else if (fraction >= 1f) { |
| final FloatKeyframe prevKeyframe = (FloatKeyframe) mKeyframes.get(mNumKeyframes - 2); |
| final FloatKeyframe nextKeyframe = (FloatKeyframe) mKeyframes.get(mNumKeyframes - 1); |
| float prevValue = prevKeyframe.getFloatValue(); |
| float nextValue = nextKeyframe.getFloatValue(); |
| float prevFraction = prevKeyframe.getFraction(); |
| float nextFraction = nextKeyframe.getFraction(); |
| final TimeInterpolator interpolator = nextKeyframe.getInterpolator(); |
| if (interpolator != null) { |
| fraction = interpolator.getInterpolation(fraction); |
| } |
| float intervalFraction = (fraction - prevFraction) / (nextFraction - prevFraction); |
| return mEvaluator == null ? |
| prevValue + intervalFraction * (nextValue - prevValue) : |
| ((Number)mEvaluator.evaluate(intervalFraction, prevValue, nextValue)). |
| floatValue(); |
| } |
| FloatKeyframe prevKeyframe = (FloatKeyframe) mKeyframes.get(0); |
| for (int i = 1; i < mNumKeyframes; ++i) { |
| FloatKeyframe nextKeyframe = (FloatKeyframe) mKeyframes.get(i); |
| if (fraction < nextKeyframe.getFraction()) { |
| final TimeInterpolator interpolator = nextKeyframe.getInterpolator(); |
| if (interpolator != null) { |
| fraction = interpolator.getInterpolation(fraction); |
| } |
| float intervalFraction = (fraction - prevKeyframe.getFraction()) / |
| (nextKeyframe.getFraction() - prevKeyframe.getFraction()); |
| float prevValue = prevKeyframe.getFloatValue(); |
| float nextValue = nextKeyframe.getFloatValue(); |
| return mEvaluator == null ? |
| prevValue + intervalFraction * (nextValue - prevValue) : |
| ((Number)mEvaluator.evaluate(intervalFraction, prevValue, nextValue)). |
| floatValue(); |
| } |
| prevKeyframe = nextKeyframe; |
| } |
| // shouldn't get here |
| return ((Number)mKeyframes.get(mNumKeyframes - 1).getValue()).floatValue(); |
| } |
| |
| } |
| |