@Override
public void setVisible(boolean visible) {
boolean oldValue = isVisible();
super.setVisible(visible);
if (oldValue != visible) {
if (visible) {
ShowEvent.fire(this, this);
} else {
HideEvent.fire(this, this);
}
}
}
@Override
public HandlerRegistration addShowHandler(ShowHandler handler) {
return addHandler(handler, ShowEvent.getType());
}