Is there a way to tell when a Widget is shown with GWT?

Question

I'd like to respond to an even whenever my widget is made visible on a page done with GWT and UI Binder.

Is there anything similar to the onAttach() event handler (which fires when the widget is added to the DOM), pertaining to when the widget is actually made visible?

I'd like to be able to handle the even when the widget is shown because there are a few different ways of making it visible, and I'd like a single place on the widget itself that can handle this event.

Thanks

Answer 1

The widget should be visible once added to the DOM unless you've intentionally hidden it (i.e. with CSS or hid it behind another widget). Normally, onAttached() means its on the page. If you're using CSS classes to make it visible, write a setVisible(boolean isVisible) method to your widget and set the visibility class this way. If you have it behind another widget (i.e. in layers) then you'll need to write your only logic to determine when it's visible.