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IntKeyframeSet.javaAPI DocAndroid 5.1 API6280Thu Mar 12 22:22:08 GMT 2015android.animation

IntKeyframeSet

public class IntKeyframeSet extends KeyframeSet implements Keyframes.IntKeyframes
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.

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.

Fields Summary
private int
firstValue
private int
lastValue
private int
deltaValue
private boolean
firstTime
Constructors Summary
public IntKeyframeSet(android.animation.Keyframe.IntKeyframe keyframes)


       
        super(keyframes);
Methods Summary
public android.animation.IntKeyframeSetclone()

        List<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 intgetIntValue(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 TimeInterpolator 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 TimeInterpolator 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 TimeInterpolator 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();
public java.lang.ClassgetType()

        return Integer.class;
public java.lang.ObjectgetValue(float fraction)

        return getIntValue(fraction);
public voidinvalidateCache()

        firstTime = true;