Returns <code>true</code> if there are any listeners
for the specified event type associated with the receiver,
and <code>false</code> otherwise. The event type is one of
the event constants defined in class <code>SWT</code>.
@param eventType the type of event
@return true if the event is hooked
@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>
Returns <code>true</code> if there are any listeners for the specified event type associated with the receiver, and <code>false</code> otherwise. The event type is one of the event constants defined in class <code>SWT</code>.
@param eventType the type of event @return true if the event is hooked
@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 SWT