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    <p>You'd want to implement these interfaces in your class:</p> <ul> <li>HasMouseOverHandlers </li> <li>HasMouseOutHandlers</li> <li>MouseOverHandler</li> <li>MouseOutHandler</li> </ul> <p>MouseOverEvent is fired when the mouse enters the element, and MouseOutEvent is fired when it's no longer over.</p> <p><strong>HasMouseOverHandler</strong> is implemented like this:</p> <pre><code>public HandlerRegistration addMouseOverHandler(MouseOverHandler handler) { return addDomHandler(handler, MouseOverEvent.getType()); } </code></pre> <p><strong>HasMouseOutHandler</strong> is implemented like this: </p> <pre><code>public HandlerRegistration addMouseOutHandler(MouseOutHandler handler) { return addDomHandler(handler, MouseOutEvent.getType()); } </code></pre> <p>After that you just handle the events with a MouseOverHandler and MouseOutHandler, should be pretty straightforward after that.</p> <p>If you want to add an EventHandler to an Element that already exists in the HTML the only idea I've come up with is creating a wrapper class. <strong>This is completely untested.</strong></p> <pre><code>class ElementWrapper extends UIObject implements HasMouseOverHandlers, HasMouseOutHandlers { public ElementWrapper(Element theElement) { setElement(theElement); } public HandlerRegistration addMouseOutHandler(MouseOutHandler handler) { return addDomHandler(handler, MouseOutEvent.getType()); } public HandlerRegistration addMouseOverHandler(MouseOverHandler handler) { return addDomHandler(handler, MouseOverEvent.getType()); } } </code></pre> <p>Then you could get an existing Element from the HTML and initialize like this:</p> <pre><code>onModuleLoad() { Element theElement = RootPanel().get("elementID"); ElementWrapper wrapper = new ElementWrapper(theElement); wrapper.addMouseOverHandler(new myHandler()); } </code></pre> <p>Hope this helps.</p>
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    1. POAdding a MouseOverHandler to an Element?
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    1. COThis didn't work for me. I think it's because most widgets perform more setup when registering themselves with the DOM. My solution http://stackoverflow.com/questions/879349/adding-a-mouseoverhandler-to-an-element/1885631#1885631 was to use an existing, concrete Widget's wrap(Element) method. But I had to know the element's type beforehand. By the way, you wanted to extend Widget, which has addDomHandler(), not UIObject.
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