gwtech Widgets & Event Handlers - GWT Tutorial (Google Web Toolkit)

Registering event handlers on Google Web Toolkit widgets is really easy. All you have to do is assign a function to the attribute you want to capture the events, and instantiate the class that is assigned for the job. For instance, for a click event, you simply create a function for the AddClickHandler attribute of the widget, then sent it a new ClickHandler instance, where the appropriate method is overridden. Then can be done in three ways: send an anonymous function, send a pointer to a named function, or inherit either the widget, and create the appropriate function within your class, or inherit (extend) the click handler class, and pass the this pointer to the callback function.

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gwtech Widgets & Event Handlers - GWT Tutorial (Google Web Toolkit)
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