[ CCode ( has_target = false ) ]
[ Version ( since = "3.10" ) ]
public delegate void WindowInvalidateHandlerFunc (Window window, Region region)
Whenever some area of the window is invalidated (directly in the window or in a child window) this gets called with region
in the coordinate space of window.
You can use region to just keep track of the dirty region, or you can actually change region in case you are
doing display tricks like showing a child in multiple places.
| window |
a Window |
| region |
a Region |