Window

Parent class: Container

This class provides a toplevel window on the screen. It is a descendant of the container class, and thus can hold other widgets directly. It generates events when it is loaded (or created), unloaded (or destroyed), for user close requests, and when it is resized.

Note that handling Close events may not seem very straightforward. By default, a window will ignore close events from the system (i.e. clicking on the X close button on the window's border) and remain on the screen. To accept a close event, the event sent to a OnClose( ) handler must be accepted by calling the Event::accept() method.
   void MyWindow::OnClose( Event &pEvt ) {
     pEvt.accept();
   }
This close mechanism may seem overly complicated, but it allows for a general way to ensure that a user's data can be saved before a window is unloaded without writing the code to check for window closability multiple places.