visibility_notify_event

Description:

public virtual signal bool visibility_notify_event (Event event)

The visibility_notify_event will be emitted when the widget's window is obscured or unobscured.

Note:

Modern composited windowing systems with pervasive transparency make it impossible to track the visibility of a window reliably, so this signal can not be guaranteed to provide useful information.

To receive this signal the Window associated to the widget needs to enable the VISIBILITY_NOTIFY_MASK mask.

Parameters:

event

the EventVisibility which triggered this signal.

Returns:

true to stop other handlers from being invoked for the event. false to propagate the event further.