Hi,
With GWT 2.3 I have been struggling a while with the event handling in
my custom widget.
I have created a custom widget by extending SimplePanel. I am aware
that it is usually better to create a Composite, but I have at least
one reason not to do so in this case. Please do not reply that I
should use a Composite. I am trying to understand the underlying
concepts.
Here is code showing what I try to achieve:
<code>
package se.festivitas.gwt.portal.client.view.dock;
import com.google.gwt.event.dom.client.HasMouseDownHandlers;
import com.google.gwt.event.dom.client.MouseDownEvent;
import com.google.gwt.event.dom.client.MouseDownHandler;
import com.google.gwt.event.shared.HandlerRegistration;
import com.google.gwt.user.client.DOM;
import com.google.gwt.user.client.Window;
import com.google.gwt.user.client.ui.FlowPanel;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.SimplePanel;
public class SimplePanelTest extends SimplePanel {
class FocusFlowPanel extends FlowPanel implements
HasMouseDownHandlers {
@Override
public HandlerRegistration addMouseDownHandler(MouseDownHandler
handler) {
return addDomHandler(handler, MouseDownEvent.getType());
}
}
public SimplePanelTest() {
FocusFlowPanel ffp = new FocusFlowPanel();
Label lbl = new Label("SimplePanelTest");
ffp.add(lbl);
DOM.appendChild(getElement(), ffp.getElement());
lbl.addMouseDownHandler(new MouseDownHandler() {
@Override
public void onMouseDown(MouseDownEvent event) {
Window.alert("FlowPanel Clicked!");
}
});
}
}
</code>
When instanciating this widget and adding it to the RootPanel, the
onMouseDown never fires. Why? Is there something I missed?
Adding the MouseDownHandler to the whole widget works: the onMouseDown
fires.
Thank you for any help.
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