@Override
public synchronized void dispose() {
if (hasListeners()) {
lastListenerRemoved();
}
super.dispose();
}
@Override
protected void firstListenerAdded() {
if (mySelectionListener == null) {
mySelectionListener =
new SelectionListener() {
@Override
public void widgetSelected(SelectionEvent e) {
/*
* A RadioGroup issues two selection events when a new item is selected:
* old->null and then null->new.
*
* We silently ignore events that switch to "null"...
*/
if (e.item == null) return;
handleSelectionChanged();
}
@Override
public void widgetDefaultSelected(SelectionEvent e) {}
};
}
myRadioGroup.addSelectionListener(mySelectionListener);
super.firstListenerAdded();
}
@Override
protected void lastListenerRemoved() {
myRadioGroup.removeSelectionListener(mySelectionListener);
super.lastListenerRemoved();
}
