#
#  Copyright (c) 2008 Helmut Merz helmutm@cy55.de
#
#  This program is free software; you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation; either version 2 of the License, or
#  (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

"""
Layout node + instance implementations.

$Id$
"""

from zope.cachedescriptors.property import Lazy
from zope.interface import implements

from cybertools.composer.layout.base import Layout, LayoutInstance
from cybertools.composer.layout.interfaces import ILayoutInstance
from loops.layout.browser import ConceptView
from loops.layout.interfaces import ILayoutNode, ILayoutNodeContained
from loops.view import Node


class LayoutNode(Node):

    implements(ILayoutNode, ILayoutNodeContained)


# layout instances

class NodeLayoutInstance(LayoutInstance):

    def getLayouts(self, region):
        """ Return sublayout instances.
        """
        if region is None:
            return []
        result = []
        sublayouts = self.template.sublayouts
        if sublayouts is not None:  # hard-coded sublayouts
            for l in region.layouts:
                if sublayouts is None or l.name in sublayouts:
                    li = ILayoutInstance(self.context)
                    li.template = l
                    result.append(li)
            return result
        # sublayouts specified via subnodes
        subnodes = self.context.values()
        names = region.layouts.keys()
        for n in subnodes:
            if n.viewName in names:
                layout = region.layouts[n.viewName]
                li = ILayoutInstance(n)
                li.template = layout
                result.append(li)
        # if not result: get layouts from parent node(s)
        return result

    @Lazy
    def targetView(self):
        request = self.view.request
        return ConceptView(self.context.target, request, self.context)