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#-----------------------------------------------------------------------------
#
# Copyright (c) 2005-2006 by Enthought, Inc.
# All rights reserved.
#
# Author: David C. Morrill <dmorrill@enthought.com>
#
#-----------------------------------------------------------------------------
""" The base class for user perspective actions. """
# Enthought library imports.
from traits.api import on_trait_change
# Local imports.
from .workbench_action import WorkbenchAction
class UserPerspectiveAction(WorkbenchAction):
""" The base class for user perspective actions.
Instances of this class (or its subclasses ;^) are enabled only when the
active perspective is a user perspective.
"""
###########################################################################
# 'Action' interface.
###########################################################################
def destroy(self):
""" Destroy the action. """
# This removes the active perspective listener.
self.window = None
return
###########################################################################
# Private interface.
###########################################################################
def _is_user_perspective(self, perspective):
""" Is the specified perspective a user perspective? """
# fixme: This seems a bit of a smelly way to make the determinaction!
id = perspective.id
return ((id[:19] == '__user_perspective_') and (id[-2:] == '__'))
@on_trait_change('window.active_perspective')
def _refresh_enabled(self):
""" Refresh the enabled state of the action. """
self.enabled = self.window is not None \
and self.window.active_perspective is not None \
and self._is_user_perspective(self.window.active_perspective)
return
#### EOF #####################################################################
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