visibility_notify Event

The fields that can be unified in visibility_notify events are:

1. type(T) unifies T with visibility_notify.
2. serial(S) unifies S with the serial number of the last request processed by the server.
3. send_event(B) unifies B, a boolean value, with one of

   
   

   true

   If the event was sent by another client.
   

   false

   If the event was sent by the server.

4. display(D) unifies D with the ProXL Display the event was read from.
5. window(W) unifies W with the ProXL Window that receives the event.
6. state(S) unifies S with one of:

   
   

   unobscured

   If the window is viewable and completely unobscured.
   

   partially_obscured

   If the window is viewable and partially obscured.
   

   fully_obscured

   If the window is fully obscured by another window.