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# (C) Copyright 2005-2023 Enthought, Inc., Austin, TX
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in LICENSE.txt and may be redistributed only under
# the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
""" The base class for user perspective actions. """
from traits.api import observe
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:] == "__")
@observe("window.active_perspective")
def _refresh_enabled(self, event):
""" 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
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