root/cpsskins/branches/jmo-perspectives/controllers/slot.py

##############################################################################
#
# Copyright (c) 2005-2006 Nuxeo and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL).  A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""

$Id$
"""
__docformat__ = "reStructuredText"

from zope.interface import implements

from cpsskins.controllers import Controller
from cpsskins.controllers.interfaces import IController
from cpsskins.elements.interfaces import IDisplayable, IPresentable
from cpsskins.utils import getThemeManager

class SlotController(Controller):
    """Event handler for slots.
    """
    implements(IController)

    def added(self):
        """What to do when the element has been added.
        """
        IPresentable(self.element).addPresentation()

    def removed(self):
        """What to do when the element has been removed.
        """
        tmutil = getThemeManager()
        tmutil.removeDisplays(self.element)

    def modified(self):
        """What to do when the element has been modified.
        """
        if IDisplayable(self.element).getDisplay() is None:
            IPresentable(self.element).addPresentation()