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