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/*
* Copyright (C) 2014 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.transition;
import android.animation.Animator;
import android.animation.AnimatorSet;
import android.animation.TypeEvaluator;
import android.graphics.Matrix;
/**
* Static utility methods for Transitions.
*
* @hide
*/
public class TransitionUtils {
static Animator mergeAnimators(Animator animator1, Animator animator2) {
if (animator1 == null) {
return animator2;
} else if (animator2 == null) {
return animator1;
} else {
AnimatorSet animatorSet = new AnimatorSet();
animatorSet.playTogether(animator1, animator2);
return animatorSet;
}
}
public static Transition mergeTransitions(Transition... transitions) {
int count = 0;
int nonNullIndex = -1;
for (int i = 0; i < transitions.length; i++) {
if (transitions[i] != null) {
count++;
nonNullIndex = i;
}
}
if (count == 0) {
return null;
}
if (count == 1) {
return transitions[nonNullIndex];
}
TransitionSet transitionSet = new TransitionSet();
for (int i = 0; i < transitions.length; i++) {
if (transitions[i] != null) {
transitionSet.addTransition(transitions[i]);
}
}
return transitionSet;
}
public static class MatrixEvaluator implements TypeEvaluator<Matrix> {
float[] mTempStartValues = new float[9];
float[] mTempEndValues = new float[9];
Matrix mTempMatrix = new Matrix();
@Override
public Matrix evaluate(float fraction, Matrix startValue, Matrix endValue) {
startValue.getValues(mTempStartValues);
endValue.getValues(mTempEndValues);
for (int i = 0; i < 9; i++) {
float diff = mTempEndValues[i] - mTempStartValues[i];
mTempEndValues[i] = mTempStartValues[i] + (fraction * diff);
}
mTempMatrix.setValues(mTempEndValues);
return mTempMatrix;
}
}
}
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