Custom widgets and @UiHandler

Is it possible to have a custom widget use the @UiHandler notation fo开发者_C百科r mouse events? e.g. when using GWT Designer could you right click on the custom widget, select add event handler, then select onClick. Rather than just onAttachOrDetach.

Regards Alex

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Yes you can. For example I have a textbox+label widget and I couldnt create @UiHandler event on it from somewhere because it is not standard so what i did was:

public class TextBoxAndLabel implements HasKeyUpHandlers {

private TextBox myTextBox;
private Label myLabel;


    @Override
    public HandlerRegistration addKeyUpHandler(KeyUpHandler keyUpHandler) {
        return myTextBox.addKeyUpHandler(keyUpHandler);
    }

}

and now I can implement

@UiHandler("myClassObject")

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I don't know how exactly GWT Designer detects those things, but @UiHandler looks at the event argument's type to determine the event handler type and then looks at the type of the ui:field referened in the @UiHandler for a method returning a HandlerRegistration and taking a single argument of the event handler type.

In brief: you can very well use @UiHandler with your own custom widgets, I just don't know how well GWT Designer supports this.

See http://code.google.com/p/google-web-toolkit/source/browse/trunk/user/src/com/google/gwt/uibinder/rebind/HandlerEvaluator.java