Adds the listener to the collection of listeners who will
be notified when an event of the given type occurs. When the
event does occur in the widget, the listener is notified by
sending it the <code>handleEvent()</code> message. The event
type is one of the event constants defined in class <code>SWT</code>.
@param eventType the type of event to listen for
@param listener the listener which should be notified when the event occurs
@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>
Adds the listener to the collection of listeners who will be notified when an event of the given type occurs. When the event does occur in the widget, the listener is notified by sending it the <code>handleEvent()</code> message. The event type is one of the event constants defined in class <code>SWT</code>.
@param eventType the type of event to listen for @param listener the listener which should be notified when the event occurs
@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 Listener @see SWT @see #getListeners(int) @see #removeListener(int, Listener) @see #notifyListeners