Returns the control which currently has keyboard focus,
or null if keyboard events are not currently going to
any of the controls built by the currently running
application.
@return the control under the cursor
@exception SWTException <ul>
<li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li>
<li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li>
</ul>
Returns the control which currently has keyboard focus, or null if keyboard events are not currently going to any of the controls built by the currently running application.
@return the control under the cursor
@exception SWTException <ul> <li>ERROR_THREAD_INVALID_ACCESS - if not called from the thread that created the receiver</li> <li>ERROR_DEVICE_DISPOSED - if the receiver has been disposed</li> </ul>