Class which defines the GuiAppD methods needed by PipeOutputWindow.

The PipeOutputWindow expects to have certain methods available in the GuiAppD argument to its constructor. This class enumerates those methods, and provides a default implementation which does nothing when called that is used as a default parameter to the PipeOutputWindow constructor.

busyEnd ( self )

busyStart ( self,  newcursor=None )

showMessage (
        self,
        type,
        msgTxt=None,
        )