org.gnome.gtk
Interface Widget.VisibilityNotifyEvent

Enclosing class:

Widget

public static interface Widget.VisibilityNotifyEvent

A signal providing notification that the Widget has been obscured or unobscured. To use this, go through the supplied event parameter to get to the VisibilityState as follows:

 foo.connect(new Widget.VisibilityNotifyEvent() {
     public boolean onVisibilityNotifyEvent(Widget source, EventVisibility event) {
         VisibilityState state = event.getState();
         if (state == VisibilityState.FULLY_OBSCURED) {
            ...
         }
     }
     return false;
 });
 

See VisibilityState for the constants describing the possible three possible changes to an underlying element's visibility. See also Widget.UnmapEvent for a discussion of how this can be used to actively toggle the presentation of a Window to the user.

Since:

4.0.5

Author:

Andrew Cowie

Method Summary

boolean

onVisibilityNotifyEvent(Widget source, EventVisibility event) Although this is an event-signal, this merely reports information coming from the underlying X11 windowing system.

Method Detail

onVisibilityNotifyEvent

boolean onVisibilityNotifyEvent(Widget source,
                                EventVisibility event)

Although this is an event-signal, this merely reports information coming from the underlying X11 windowing system. Since a window being obscured by another application's window is not something you can control (short of requesting the Window holding this Widget always be on-top), it's not entirely clear what good it would do to block further emission of this signal. Return false!