The ::expose-event signal is emitted when an area of a previously
obscured GdkWindow is made visible and needs to be redrawn.
GTK_NO_WINDOW widgets will get a synthesized event from their parent
widget.
To receive this signal, the GdkWindow associated to the widget needs
to enable the GDK_EXPOSURE_MASK mask.
The ::expose-event signal is emitted when an area of a previously obscured GdkWindow is made visible and needs to be redrawn. GTK_NO_WINDOW widgets will get a synthesized event from their parent widget. To receive this signal, the GdkWindow associated to the widget needs to enable the GDK_EXPOSURE_MASK mask.