Java tutorial
/* 50AH-code ========= 50 Android Hacks (http://manning.com/sessa/) book source code Copyright (c) 2012 Manning Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ /* * 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 com.actionbarsherlock.internal.nineoldandroids.animation; import java.util.ArrayList; import android.view.animation.Interpolator; import com.actionbarsherlock.internal.nineoldandroids.animation.Keyframe.IntKeyframe; /** * This class holds a collection of IntKeyframe 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 * float, 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> */ @SuppressWarnings("unchecked") class IntKeyframeSet extends KeyframeSet { private int firstValue; private int lastValue; private int deltaValue; private boolean firstTime = true; public IntKeyframeSet(IntKeyframe... keyframes) { super(keyframes); } @Override public Object getValue(float fraction) { return getIntValue(fraction); } @Override public IntKeyframeSet clone() { ArrayList<Keyframe> keyframes = mKeyframes; int numKeyframes = mKeyframes.size(); IntKeyframe[] newKeyframes = new IntKeyframe[numKeyframes]; for (int i = 0; i < numKeyframes; ++i) { newKeyframes[i] = (IntKeyframe) keyframes.get(i).clone(); } IntKeyframeSet newSet = new IntKeyframeSet(newKeyframes); return newSet; } public int getIntValue(float fraction) { if (mNumKeyframes == 2) { if (firstTime) { firstTime = false; firstValue = ((IntKeyframe) mKeyframes.get(0)).getIntValue(); lastValue = ((IntKeyframe) mKeyframes.get(1)).getIntValue(); deltaValue = lastValue - firstValue; } if (mInterpolator != null) { fraction = mInterpolator.getInterpolation(fraction); } if (mEvaluator == null) { return firstValue + (int) (fraction * deltaValue); } else { return ((Number) mEvaluator.evaluate(fraction, firstValue, lastValue)).intValue(); } } if (fraction <= 0f) { final IntKeyframe prevKeyframe = (IntKeyframe) mKeyframes.get(0); final IntKeyframe nextKeyframe = (IntKeyframe) mKeyframes.get(1); int prevValue = prevKeyframe.getIntValue(); int nextValue = nextKeyframe.getIntValue(); float prevFraction = prevKeyframe.getFraction(); float nextFraction = nextKeyframe.getFraction(); final /*Time*/Interpolator interpolator = nextKeyframe.getInterpolator(); if (interpolator != null) { fraction = interpolator.getInterpolation(fraction); } float intervalFraction = (fraction - prevFraction) / (nextFraction - prevFraction); return mEvaluator == null ? prevValue + (int) (intervalFraction * (nextValue - prevValue)) : ((Number) mEvaluator.evaluate(intervalFraction, prevValue, nextValue)).intValue(); } else if (fraction >= 1f) { final IntKeyframe prevKeyframe = (IntKeyframe) mKeyframes.get(mNumKeyframes - 2); final IntKeyframe nextKeyframe = (IntKeyframe) mKeyframes.get(mNumKeyframes - 1); int prevValue = prevKeyframe.getIntValue(); int nextValue = nextKeyframe.getIntValue(); float prevFraction = prevKeyframe.getFraction(); float nextFraction = nextKeyframe.getFraction(); final /*Time*/Interpolator interpolator = nextKeyframe.getInterpolator(); if (interpolator != null) { fraction = interpolator.getInterpolation(fraction); } float intervalFraction = (fraction - prevFraction) / (nextFraction - prevFraction); return mEvaluator == null ? prevValue + (int) (intervalFraction * (nextValue - prevValue)) : ((Number) mEvaluator.evaluate(intervalFraction, prevValue, nextValue)).intValue(); } IntKeyframe prevKeyframe = (IntKeyframe) mKeyframes.get(0); for (int i = 1; i < mNumKeyframes; ++i) { IntKeyframe nextKeyframe = (IntKeyframe) mKeyframes.get(i); if (fraction < nextKeyframe.getFraction()) { final /*Time*/Interpolator interpolator = nextKeyframe.getInterpolator(); if (interpolator != null) { fraction = interpolator.getInterpolation(fraction); } float intervalFraction = (fraction - prevKeyframe.getFraction()) / (nextKeyframe.getFraction() - prevKeyframe.getFraction()); int prevValue = prevKeyframe.getIntValue(); int nextValue = nextKeyframe.getIntValue(); return mEvaluator == null ? prevValue + (int) (intervalFraction * (nextValue - prevValue)) : ((Number) mEvaluator.evaluate(intervalFraction, prevValue, nextValue)).intValue(); } prevKeyframe = nextKeyframe; } // shouldn't get here return ((Number) mKeyframes.get(mNumKeyframes - 1).getValue()).intValue(); } }