How to add double click event for ListBox?

[anuradh...@gmail.com]

Hi,

I am using com.google.gwt.user.client.ui.ListBox of GWT 1.4.61.
I want to perform some operation on double click event of the List box
item.
So did anybody implemented this before?

Thanks in advance.
Anuradha Badve

[wangzhengjiang]

I wrote code for Label to catch double click event:
the code as below

package com.thg.srp.gwt.client;

import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Event;
import com.google.gwt.user.client.ui.ChangeListener;
import com.google.gwt.user.client.ui.ChangeListenerCollection;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.SourcesChangeEvents;

public class LabelCatchDoubleClick extends Label implements
SourcesChangeEvents {
private ChangeListenerCollection changeListeners;

public LabelCatchDoubleClick(){
super();
this.sinkEvents(Event.ONDBLCLICK);
}

public void onBrowserEvent(Event event) {
super.onBrowserEvent(event);
int type = DOM.eventGetType(event);
switch (type) {
case Event.ONDBLCLICK: {
if (changeListeners != null) {
changeListeners.fireChange(this);
}
break;
}
}
}



public void addChangeListener(ChangeListener arg0) {
if (changeListeners == null)
changeListeners = new ChangeListenerCollection();
changeListeners.add(arg0);

}

public void removeChangeListener(ChangeListener arg0) {
if (changeListeners != null)
changeListeners.remove(arg0);

}

}


for testing, using following class.

package com.thg.srp.gwt.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.ChangeListener;
import com.google.gwt.user.client.ui.FlexTable;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;

public class GWTTest implements EntryPoint {

LabelCatchDoubleClick lcdc=new LabelCatchDoubleClick();
public void onModuleLoad() {
FlexTable ft = new FlexTable();
lcdc.setText("testing");
ft.setWidget(0,0,lcdc);
lcdc.addChangeListener(new ChangeListener() {

public void onChange(Widget arg0) {
Window.alert("Double click "+lcdc.getText());

}
});
RootPanel rootpanel = RootPanel.get();
rootpanel.add(ft);

}

}


Maybe you can use same method, basically extends the class you want to
use, then catching the double click event and fire change event when
user double click.