This package provides the typed events and listener interfaces and,
where appropriate, matching adapter classes which make up the
"high level" typed listener support provided by SWT.
For contrast, see also the untyped listener support provided
by class org.eclipse.swt.widgets.Event and interface
org.eclipse.swt.widgets.Listener, and the
addListener and removeListener methods in
class org.eclipse.swt.widgets.Widget.