/**
* Copyright (c) 2015-present, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*/
package com.facebook.react.animation;
import android.view.View;
/**
* Base class for {@link AnimationPropertyUpdater} subclasses that updates a pair of float property
* values. It helps to handle convertion from animation progress to the actual values as
* well as the quite common case when no starting value is provided.
*/
public abstract class AbstractFloatPairPropertyUpdater implements AnimationPropertyUpdater {
private final float[] mFromValues = new float[2];
private final float[] mToValues = new float[2];
private final float[] mUpdateValues = new float[2];
private boolean mFromSource;
protected AbstractFloatPairPropertyUpdater(float toFirst, float toSecond) {
mToValues[0] = toFirst;
mToValues[1] = toSecond;
mFromSource = true;
}
protected AbstractFloatPairPropertyUpdater(
float fromFirst,
float fromSecond,
float toFirst,
float toSecond) {
this(toFirst, toSecond);
mFromValues[0] = fromFirst;
mFromValues[1] = fromSecond;
mFromSource = false;
}
protected abstract void getProperty(View view, float[] returnValues);
protected abstract void setProperty(View view, float[] propertyValues);
@Override
public void prepare(View view) {
if (mFromSource) {
getProperty(view, mFromValues);
}
}
@Override
public void onUpdate(View view, float progress) {
mUpdateValues[0] = mFromValues[0] + (mToValues[0] - mFromValues[0]) * progress;
mUpdateValues[1] = mFromValues[1] + (mToValues[1] - mFromValues[1]) * progress;
setProperty(view, mUpdateValues);
}
@Override
public void onFinish(View view) {
setProperty(view, mToValues);
}
}