/**
* Copyright 2010 Google Inc.
*
* 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 org.waveprotocol.wave.client.wavepanel.impl.collapse;
import com.google.gwt.dom.client.Element;
import com.google.gwt.dom.client.NativeEvent;
import com.google.gwt.event.dom.client.MouseDownEvent;
import org.waveprotocol.wave.client.wavepanel.WavePanel;
import org.waveprotocol.wave.client.wavepanel.event.EventHandlerRegistry;
import org.waveprotocol.wave.client.wavepanel.event.WaveMouseDownHandler;
import org.waveprotocol.wave.client.wavepanel.view.InlineThreadView;
import org.waveprotocol.wave.client.wavepanel.view.View.Type;
import org.waveprotocol.wave.client.wavepanel.view.dom.DomAsViewProvider;
import org.waveprotocol.wave.client.wavepanel.view.dom.full.TypeCodes;
/**
* Interpets user gestures as collapse/expand actions.
*
*/
public final class CollapseController implements WaveMouseDownHandler {
private final CollapsePresenter collapser;
private final DomAsViewProvider panel;
/**
* Creates a focus controller.
*/
private CollapseController(CollapsePresenter focus, DomAsViewProvider panel) {
this.collapser = focus;
this.panel = panel;
}
/**
* Installs the collapse/expand feature in a wave panel.
*/
public static void install(CollapsePresenter focus, WavePanel panel) {
new CollapseController(focus, panel.getViewProvider()).install(panel.getHandlers());
}
private void install(EventHandlerRegistry handlers) {
handlers.registerMouseDownHandler(TypeCodes.kind(Type.TOGGLE), this);
}
@Override
public boolean onMouseDown(MouseDownEvent event, Element source) {
if (event.getNativeButton() != NativeEvent.BUTTON_LEFT) {
return false;
}
handleClick(panel.fromToggle(source));
return false;
}
/**
* Handles a click on a toggle.
*/
private void handleClick(InlineThreadView thread) {
collapser.toggle(thread);
}
}