l
is null
, no exception is thrown and no action is performed. Refer to AWT Threading Issues for details on AWT's threading model. @param l the focus listener @see java.awt.event.FocusEvent @see java.awt.event.FocusListener @see #removeFocusListener @see #getFocusListeners @since JDK1.1
The suggested implementation is to install listeners for {@link SWT#Activate} and {@link SWT#Deactivate}on the shell and forward events to the focus listeners. Clients are encouraged to subclass {@link AbstractInformationControl}, which does this for free.
@param listener the listener to be addedFocusListener
interface.
@param listener the listener which should be notified
@exception IllegalArgumentException
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