如何知道窗口小部件何时被渲染？

Question

Is there a way to handle or at least know when the Widget is being rendered on the browser screen? I mean when the render event is about to happen for a widget or when render is done?

Answer 1

Every widget has protected onLoad() method and this method called immediately after a widget becomes attached to the browser's document.

See GWT Rendering Process explanation on David Maddison's blog.