This adapter class provides default implementations for the methods described by the
IPerspectiveListener
interface and its extension interfaces.
Classes that wish to deal with events which occur as perspectives are added, removed, activated and changed, can extend this class and override only the methods which they are interested in.
@see org.eclipse.ui.IPerspectiveListener
@see org.eclipse.ui.IPerspectiveListener2
@see org.eclipse.ui.IPerspectiveListener3
@see org.eclipse.ui.IPerspectiveListener4
@since 3.1