Adds a verify key listener. A VerifyKey event is sent by the widget when a key
is pressed. The widget ignores the key press if the listener sets the doit field
of the event to false.
@param listener the listener
@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>
@exception IllegalArgumentException <ul>
<li>ERROR_NULL_ARGUMENT when listener is null</li>
</ul>
Adds a verify key listener. A VerifyKey event is sent by the widget when a key is pressed. The widget ignores the key press if the listener sets the doit field of the event to false.
@param listener the listener @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> @exception IllegalArgumentException <ul> <li>ERROR_NULL_ARGUMENT when listener is null</li> </ul>