Search code examples
javagwtmvpgwtp

How can I know what Widget call the Handler or Event?

I'm using GWT-Platform in my project, and I want to check what Widget called some Handler, for example, a BlurHandler.

The reason for my question is below. This BlurHandler is registred by four TextField.

@Override
public void addFormatTextBoxListener(BlurHandler handler) {
    tbAlt.addBlurHandler(handler);
    tbLat.addBlurHandler(handler);
    tbMedida.addBlurHandler(handler);
    tbLong.addBlurHandler(handler);
}

In my Presenter I want to find what field(Widget) lost the focus(Result of BlurEvent).

getView().addFormatTextBoxListener(new BlurHandler() {
        @Override
        public void onBlur(BlurEvent event) {
            doFormatTextBox();
        }
    });
private void doFormatTextBox() {
    //who called me???
}

The method doFormatTextBox will be called when one of the four Widget's lost focus. But what Widget losted focus?

Solution

  • Redading the Event API (http://google-web-toolkit.googlecode.com/svn/javadoc/1.5/com/google/gwt/user/client/Event.html) it seams as though Element e1 = event.getTarget() and then doing if (e1.equals(widget1.getElement())){//do stuff...} should work.

    This is assuming BlurEvent extends com.google.gwt.user.client.Event which I'm not completely sure.