public interface HasVisibilityChangedHandlers extends com.google.gwt.event.shared.HasHandlers
|Modifier and Type||Method and Description|
Notification fired when this canvas becomes visible or hidden to the user.
com.google.gwt.event.shared.HandlerRegistration addVisibilityChangedHandler(VisibilityChangedHandler handler)
Canvas.isVisible()state of this component changes. It may be fired in response an explicit call to
Canvas.setVisibility(), or in response to a parent component being shown or hidden when this widgets
visibilityis set to "inherit".
Note that a call to
will not always fire this notification. If this widget has a hidden parent, show or hide would change this
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
handler- the visibilityChanged handler
HandlerRegistrationused to remove this handler