void onVisibilityChanged(VisibilityChangedEvent event)
isVisible()state of this component changes. It may be fired in response an explicit call to
hide(), or in response to a parent component being shown or hidden when this widgets
visibilityis set to "inherit".
Note that a call to
not always fire this notification. If this widget has a hidden parent, show or hide would change this components
visibility property, and may update the CSS visibility
attribute of the drawn handle in the DOM, but would not actually hide or reveal the component to the user and as such
the notification would not fire.
Note also that this notification will only be fired for components which have been
event- the event