org.eclipse.swt.widgets.Widget#removeListener ( )源码实例Demo

private void updateListeners() {
	for (int eventId : eventIds) {
		boolean selected = selectedEvents.contains(new Integer(eventId));

		controlExample.removeListener(eventId, listenerThatPrints);
		if (selected && listen.getSelection()) {
			controlExample.addListener(eventId, listenerThatPrints);
		}

		for (Iterator iterator = additionalEventParticipants.iterator(); iterator.hasNext();) {
			Widget participant = (Widget) iterator.next();

			participant.removeListener(eventId, listenerThatPrints);
			if (selected && listen.getSelection()) {
				participant.addListener(eventId, listenerThatPrints);
			}
		}
	}
}
 

/**
 * @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event)
 */
public void handleEvent(Event event)
{
	Widget source = event.widget;
	source.removeListener(SWT.Dispose, this);

	int type = getShellType(source);
	checkType(type);
	fShells[type] = null;

	switch (type)
	{
		case LAYOUT_PROPOSAL_SELECTOR:
			if (fContextType == LAYOUT_CONTEXT_SELECTOR && Helper.okToUse(fShells[LAYOUT_CONTEXT_SELECTOR]))
			{
				// Restore event notification to the tip popup.
				addContentAssistListener((IContentAssistListener) fPopups[LAYOUT_CONTEXT_SELECTOR],
						CONTEXT_SELECTOR);
			}
			break;

		case LAYOUT_CONTEXT_SELECTOR:
			if (Helper.okToUse(fShells[LAYOUT_PROPOSAL_SELECTOR]))
			{
				if (fProposalPopupOrientation == PROPOSAL_STACKED)
				{
					layout(LAYOUT_PROPOSAL_SELECTOR, getSelectionOffset());
				}
				// Restore event notification to the proposal popup.
				addContentAssistListener((IContentAssistListener) fPopups[LAYOUT_PROPOSAL_SELECTOR],
						PROPOSAL_SELECTOR);
			}
			fContextType = LAYOUT_CONTEXT_INFO_POPUP;
			break;

		case LAYOUT_CONTEXT_INFO_POPUP:
			if (Helper.okToUse(fShells[LAYOUT_PROPOSAL_SELECTOR]))
			{
				if (fContextInfoPopupOrientation == CONTEXT_INFO_BELOW)
				{
					layout(LAYOUT_PROPOSAL_SELECTOR, getSelectionOffset());
				}
			}
			fContextType = LAYOUT_CONTEXT_SELECTOR;
			break;

		default:
			break;
	}
}