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nextprevious.py
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nextprevious.py
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# -*- coding: utf-8 -*-
from AccessControl import getSecurityManager
from Acquisition import aq_base
from plone.app.dexterity import _
from plone.app.layout.nextprevious.interfaces import INextPreviousProvider
from plone.autoform import directives
from plone.autoform.interfaces import IFormFieldProvider
from plone.registry.interfaces import IRegistry
from plone.supermodel import model
from Products.CMFCore.interfaces import IContentish
from z3c.form import widget
from z3c.form.interfaces import IAddForm
from z3c.form.interfaces import IEditForm
from zope import schema
from zope.component import adapter
from zope.component import getUtility
from zope.interface import implementer
from zope.interface import Interface
from zope.interface import provider
class INextPreviousEnabled(Interface):
"""Behavior interface to enable next previous navigation for all items of
a type.
"""
@provider(IFormFieldProvider)
class INextPreviousToggle(model.Schema):
"""Behavior interface to enable next previous navigation per item.
"""
model.fieldset('settings', label=_(u"Settings"),
fields=['nextPreviousEnabled'])
nextPreviousEnabled = schema.Bool(
title=_(
u'label_nextprevious',
default=u'Enable next previous navigation'
),
description=_(
u'help_nextprevious',
default=u'This enables next/previous widget on content items ' +
u'contained in this folder.'
),
default=False
)
directives.omitted('nextPreviousEnabled')
directives.no_omit(IEditForm, 'nextPreviousEnabled')
directives.no_omit(IAddForm, 'nextPreviousEnabled')
def getNextPreviousParentValue(adapter_):
context = adapter_.context
nextprevious = INextPreviousProvider(context, None)
if nextprevious is None:
return False
return nextprevious.enabled
DefaultNextPreviousEnabled = widget.ComputedWidgetAttribute(
getNextPreviousParentValue,
field=INextPreviousToggle['nextPreviousEnabled'],
)
# This is taken from plone.app.folder
class NextPreviousBase(object):
""" adapter for acting as a next/previous provider """
def __init__(self, context):
self.context = context
registry = getUtility(IRegistry)
self.vat = registry.get('plone.types_use_view_action_in_listings', [])
self.security = getSecurityManager()
order = context.getOrdering()
if not isinstance(order, list):
order = order.idsInOrder()
if not isinstance(order, list):
order = None
self.order = order
def getNextItem(self, obj):
""" return info about the next item in the container """
if not self.order:
return None
pos = self.context.getObjectPosition(obj.getId())
if not pos:
return None
for oid in self.order[pos + 1:]:
data = self.getData(self.context[oid])
if data:
return data
def getPreviousItem(self, obj):
""" return info about the previous item in the container """
if not self.order:
return None
order_reversed = list(reversed(self.order))
pos = order_reversed.index(obj.getId())
for oid in order_reversed[pos + 1:]:
data = self.getData(self.context[oid])
if data:
return data
def getData(self, obj):
""" return the expected mapping, see `INextPreviousProvider` """
if not self.security.checkPermission('View', obj):
return None
elif not IContentish.providedBy(obj):
# do not return a not contentish object
# such as a local workflow policy for example (#11234)
return None
ptype = obj.portal_type
url = obj.absolute_url()
if ptype in self.vat: # "use view action in listings"
url += '/view'
return dict(
id=obj.getId(),
url=url,
title=obj.Title(),
description=obj.Description(),
portal_type=ptype
)
@implementer(INextPreviousProvider)
@adapter(INextPreviousToggle)
class NextPreviousToggle(NextPreviousBase):
""" adapter for acting as a next/previous provider """
@property
def enabled(self):
return getattr(aq_base(self.context), 'nextPreviousEnabled', False)
@implementer(INextPreviousProvider)
@adapter(INextPreviousEnabled)
class NextPreviousEnabled(NextPreviousBase):
""" adapter for acting as a next/previous provider """
enabled = True