Java 类org.eclipse.swt.events.MenuListener 实例源码

/**
 * Adds the listener to the collection of listeners who will be notified
 * when menus are hidden or shown, by sending it one of the messages defined
 * in the <code>MenuListener</code> interface.
 * 
 * @param listener
 *            the listener which should be notified
 * 
 * @exception IllegalArgumentException
 *                <ul>
 *                <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 *                </ul>
 * @exception SWTException
 *                <ul>
 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
 *                disposed</li>
 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
 *                thread that created the receiver</li>
 *                </ul>
 * 
 * @see MenuListener
 * @see #removeMenuListener
 */
public void addMenuListener(MenuListener listener) {
    checkWidget();
    if (listener == null)
        error(SWT.ERROR_NULL_ARGUMENT);
    TypedListener typedListener = new TypedListener(listener);
    addListener(SWT.Hide, typedListener);
    addListener(SWT.Show, typedListener);
}

/**
 * Removes the listener from the collection of listeners who will be
 * notified when the menu events are generated for the control.
 * 
 * @param listener
 *            the listener which should no longer be notified
 * 
 * @exception IllegalArgumentException
 *                <ul>
 *                <li>ERROR_NULL_ARGUMENT - if the listener is null</li>
 *                </ul>
 * @exception SWTException
 *                <ul>
 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
 *                disposed</li>
 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
 *                thread that created the receiver</li>
 *                </ul>
 * 
 * @see MenuListener
 * @see #addMenuListener
 */
public void removeMenuListener(MenuListener listener) {
    checkWidget();
    if (listener == null)
        error(SWT.ERROR_NULL_ARGUMENT);
    if (eventTable == null)
        return;
    eventTable.unhook(SWT.Hide, listener);
    eventTable.unhook(SWT.Show, listener);
}