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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 android.view.Gravity;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;
import com.android.gallery3d.R;
import com.android.gallery3d.photoeditor.FilterStack;
import com.android.gallery3d.photoeditor.OnDoneCallback;
import com.android.gallery3d.photoeditor.filters.Filter;
/**
* An action binding UI controls and effect operation for editing photo.
*/
public abstract class EffectAction extends LinearLayout {
/**
* Listener of effect action.
*/
public interface ActionListener {
/**
* Invoked when the action is okayed (effect is applied and completed).
*/
void onOk();
}
protected EffectToolKit toolKit;
private Toast tooltip;
private FilterStack filterStack;
private boolean pushedFilter;
private boolean disableFilterOutput;
private FilterChangedCallback lastFilterChangedCallback;
private ActionListener listener;
public EffectAction(Context context, AttributeSet attrs) {
super(context, attrs);
}
public void begin(View root, FilterStack filterStack, ActionListener listener) {
// This view is already detached from UI view hierarchy by reaching here; findViewById()
// could only access its own child views from here.
toolKit = new EffectToolKit(root, ((TextView) findViewById(R.id.effect_label)).getText());
this.filterStack = filterStack;
this.listener = listener;
// Shows the tooltip if it's available.
if (getTag() != null) {
tooltip = Toast.makeText(getContext(), (String) getTag(), Toast.LENGTH_SHORT);
tooltip.setGravity(Gravity.CENTER, 0, 0);
tooltip.show();
}
prepare();
}
/**
* Subclasses should create a specific filter and bind the filter to necessary UI controls here
* when the action is about to begin.
*/
protected abstract void prepare();
/**
* Ends the effect and then executes the runnable after the effect is finished.
*/
public void end(final Runnable runnableOnODone) {
// Cancel the tooltip if it's still showing.
if ((tooltip != null) && (tooltip.getView().getParent() != null)) {
tooltip.cancel();
tooltip = null;
}
// End tool editing by canceling unfinished touch events.
toolKit.cancel();
// Output the pushed filter if it wasn't outputted.
if (pushedFilter && disableFilterOutput) {
outputFilter();
}
// Wait till last output callback is done before finishing.
if ((lastFilterChangedCallback == null) || lastFilterChangedCallback.done) {
finish(runnableOnODone);
} else {
lastFilterChangedCallback.runnableOnReady = new Runnable() {
@Override
public void run() {
finish(runnableOnODone);
}
};
}
}
private void finish(Runnable runnableOnDone) {
toolKit.close();
pushedFilter = false;
disableFilterOutput = false;
lastFilterChangedCallback = null;
runnableOnDone.run();
}
protected void disableFilterOutput() {
// Filter output won't be outputted until this effect has done editing its filter.
disableFilterOutput = true;
}
protected void outputFilter() {
// Notify the stack to execute the changed top filter and output the results.
lastFilterChangedCallback = new FilterChangedCallback();
filterStack.topFilterChanged(lastFilterChangedCallback);
}
protected void notifyChanged(Filter filter) {
if (!pushedFilter) {
filterStack.pushFilter(filter);
pushedFilter = true;
}
if (pushedFilter && !disableFilterOutput) {
outputFilter();
}
}
protected void notifyOk() {
listener.onOk();
}
/**
* Checks if the action effect is present in the system.
*
* @return boolean true if an action effect is present in the system and can be loaded
*/
public boolean isPresent() {
return true;
}
/**
* Done callback for executing top filter changes.
*/
private class FilterChangedCallback implements OnDoneCallback {
private boolean done;
private Runnable runnableOnReady;
@Override
public void onDone() {
done = true;
if (runnableOnReady != null) {
runnableOnReady.run();
}
}
}
}
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