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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.ObjectAnimator;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
/**
* This transition captures the scroll properties of targets before and after
* the scene change and animates any changes.
*/
public class ChangeScroll extends Transition {
private static final String PROPNAME_SCROLL_X = "android:changeScroll:x";
private static final String PROPNAME_SCROLL_Y = "android:changeScroll:y";
private static final String[] PROPERTIES = {
PROPNAME_SCROLL_X,
PROPNAME_SCROLL_Y,
};
public ChangeScroll() {}
public ChangeScroll(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void captureStartValues(TransitionValues transitionValues) {
captureValues(transitionValues);
}
@Override
public void captureEndValues(TransitionValues transitionValues) {
captureValues(transitionValues);
}
@Override
public String[] getTransitionProperties() {
return PROPERTIES;
}
private void captureValues(TransitionValues transitionValues) {
transitionValues.values.put(PROPNAME_SCROLL_X, transitionValues.view.getScrollX());
transitionValues.values.put(PROPNAME_SCROLL_Y, transitionValues.view.getScrollY());
}
@Override
public Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues,
TransitionValues endValues) {
if (startValues == null || endValues == null) {
return null;
}
final View view = endValues.view;
int startX = (Integer) startValues.values.get(PROPNAME_SCROLL_X);
int endX = (Integer) endValues.values.get(PROPNAME_SCROLL_X);
int startY = (Integer) startValues.values.get(PROPNAME_SCROLL_Y);
int endY = (Integer) endValues.values.get(PROPNAME_SCROLL_Y);
Animator scrollXAnimator = null;
Animator scrollYAnimator = null;
if (startX != endX) {
view.setScrollX(startX);
scrollXAnimator = ObjectAnimator.ofInt(view, "scrollX", startX, endX);
}
if (startY != endY) {
view.setScrollY(startY);
scrollYAnimator = ObjectAnimator.ofInt(view, "scrollY", startY, endY);
}
return TransitionUtils.mergeAnimators(scrollXAnimator, scrollYAnimator);
}
}
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