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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.RotateFilter;
/**
* An action handling rotate effect.
*/
public class RotateAction extends EffectAction {
private static final float DEFAULT_ANGLE = 0.0f;
private static final float DEFAULT_ROTATE_SPAN = 360.0f;
private RotateFilter filter;
private float rotateDegrees;
private Runnable queuedRotationChange;
private RotateView rotateView;
public RotateAction(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
public void doBegin() {
filter = new RotateFilter();
rotateView = factory.createRotateView();
rotateView.setOnRotateChangeListener(new RotateView.OnRotateChangeListener() {
// Directly transform photo-view because running the rotate filter isn't fast enough.
PhotoView photoView = (PhotoView) rotateView.getRootView().findViewById(
R.id.photo_view);
@Override
public void onAngleChanged(float degrees, boolean fromUser){
if (fromUser) {
rotateDegrees = degrees;
updateRotateFilter(false);
transformPhotoView(degrees);
}
}
@Override
public void onStartTrackingTouch() {
// no-op
}
@Override
public void onStopTrackingTouch() {
roundRotateDegrees();
updateRotateFilter(false);
transformPhotoView(rotateDegrees);
rotateView.setRotatedAngle(rotateDegrees);
}
private void transformPhotoView(final float degrees) {
// Remove the outdated rotation change before queuing a new one.
if (queuedRotationChange != null) {
photoView.remove(queuedRotationChange);
}
queuedRotationChange = new Runnable() {
@Override
public void run() {
photoView.rotatePhoto(degrees);
}
};
photoView.queue(queuedRotationChange);
}
});
rotateView.setRotatedAngle(DEFAULT_ANGLE);
rotateView.setRotateSpan(DEFAULT_ROTATE_SPAN);
rotateDegrees = 0;
queuedRotationChange = null;
}
@Override
public void doEnd() {
rotateView.setOnRotateChangeListener(null);
// Round the current rotation degrees in case rotation tracking has not stopped yet.
roundRotateDegrees();
updateRotateFilter(true);
}
/**
* Rounds rotate degrees to multiples of 90 degrees.
*/
private void roundRotateDegrees() {
if (rotateDegrees % 90 != 0) {
rotateDegrees = Math.round(rotateDegrees / 90) * 90;
}
}
private void updateRotateFilter(boolean outputFilter) {
filter.setAngle(rotateDegrees);
notifyFilterChanged(filter, outputFilter);
}
}
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