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/*
* 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.android.gallery3d.photoeditor.actions;
import android.content.Context;
import android.util.AttributeSet;
import com.android.gallery3d.R;
import com.android.gallery3d.photoeditor.PhotoView;
import com.android.gallery3d.photoeditor.filters.FlipFilter;
/**
* An action handling flip effect.
*/
public class FlipAction extends EffectAction {
private static final float DEFAULT_ANGLE = 0.0f;
private static final float DEFAULT_FLIP_SPAN = 180.0f;
private FlipFilter filter;
private float horizontalFlipDegrees;
private float verticalFlipDegrees;
private Runnable queuedFlipChange;
private FlipView flipView;
public FlipAction(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void doBegin() {
filter = new FlipFilter();
flipView = factory.createFlipView();
flipView.setOnFlipChangeListener(new FlipView.OnFlipChangeListener() {
// Directly transform photo-view because running the flip filter isn't fast enough.
PhotoView photoView = (PhotoView) flipView.getRootView().findViewById(
R.id.photo_view);
@Override
public void onAngleChanged(float horizontalDegrees, float verticalDegrees,
boolean fromUser) {
if (fromUser) {
horizontalFlipDegrees = horizontalDegrees;
verticalFlipDegrees = verticalDegrees;
updateFlipFilter(false);
transformPhotoView(horizontalDegrees, verticalDegrees);
}
}
@Override
public void onStartTrackingTouch() {
// no-op
}
@Override
public void onStopTrackingTouch() {
roundFlipDegrees();
updateFlipFilter(false);
transformPhotoView(horizontalFlipDegrees, verticalFlipDegrees);
flipView.setFlippedAngles(horizontalFlipDegrees, verticalFlipDegrees);
}
private void transformPhotoView(final float horizontalDegrees,
final float verticalDegrees) {
// Remove the outdated flip change before queuing a new one.
if (queuedFlipChange != null) {
photoView.remove(queuedFlipChange);
}
queuedFlipChange = new Runnable() {
@Override
public void run() {
photoView.flipPhoto(horizontalDegrees, verticalDegrees);
}
};
photoView.queue(queuedFlipChange);
}
});
flipView.setFlippedAngles(DEFAULT_ANGLE, DEFAULT_ANGLE);
flipView.setFlipSpan(DEFAULT_FLIP_SPAN);
horizontalFlipDegrees = 0;
verticalFlipDegrees = 0;
queuedFlipChange = null;
}
@Override
public void doEnd() {
flipView.setOnFlipChangeListener(null);
// Round the current flip degrees in case flip tracking has not stopped yet.
roundFlipDegrees();
updateFlipFilter(true);
}
/**
* Rounds flip degrees to multiples of 180 degrees.
*/
private void roundFlipDegrees() {
if (horizontalFlipDegrees % 180 != 0) {
horizontalFlipDegrees = Math.round(horizontalFlipDegrees / 180) * 180;
}
if (verticalFlipDegrees % 180 != 0) {
verticalFlipDegrees = Math.round(verticalFlipDegrees / 180) * 180;
}
}
private void updateFlipFilter(boolean outputFilter) {
// Flip the filter if the flipped degrees are at the opposite directions.
filter.setFlip(((int) horizontalFlipDegrees / 180) % 2 != 0,
((int) verticalFlipDegrees / 180) % 2 != 0);
notifyFilterChanged(filter, outputFilter);
}
}
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