actions to set a Navigation Root

actions.py

from zope.interface import Interface 
from zope.interface import directlyProvides 
from zope.interface import noLongerProvides
from Products.Five.browser import BrowserView
from Products.CMFPlone.interfaces import INavigationRoot
from Products.CMFPlone import PloneMessageFactory as _

class IPossibleNavigationRoot(Interface):
    pass

class ActionsView(BrowserView):
    
    def enableNavigationRoot(self):
        directlyProvides(self.context, INavigationRoot)
        self.context.portal_catalog.reindexObject(self.context, 
                                                  idxs=['object_provides'], 
                                                  update_metadata=1)
        self.context.plone_utils.addPortalMessage(
            _(u'Enabled Navigation Root.'))
        self.request.response.redirect(self.context.absolute_url())

    def disableNavigationRoot(self):
        noLongerProvides(self.context, INavigationRoot)
        self.context.portal_catalog.reindexObject(self.context, 
                                                  idxs=['object_provides'], 
                                                  update_metadata=1)
        self.context.plone_utils.addPortalMessage(
            _(u'Disabled Navigation Root.'))
        self.request.response.redirect(self.context.absolute_url())
        
    def isPossibleToEnableNavigationRoot(self):
        return IPossibleNavigationRoot.providedBy(self.context) \
               and not INavigationRoot.providedBy(self.context)
        
    def isPossibleToDisableNavigationRoot(self):
        return IPossibleNavigationRoot.providedBy(self.context) \
               and INavigationRoot.providedBy(self.context)
    
    
    

actions.xml

<?xml version="1.0"?>
<object name="portal_actions" meta_type="Plone Actions Tool"
	xmlns:i18n="http://xml.zope.org/namespaces/i18n">
	<object name="object_buttons" meta_type="CMF Action Category">
		<object name="enableNavigation" 
		        meta_type="CMF Action"
			    i18n:domain="kup.site.e2p">
			<property name="title" i18n:translate="">
				Enable Navigation
			</property>
			<property name="description" i18n:translate="">
				Activate Folder as Navigation 
			</property>
			<property name="url_expr">
				string:${object/absolute_url}/@@enable-NavigationRoot
			</property>
			<property name="icon_expr"></property>
			<property name="available_expr">
				object/@@is-possible-to-enable-NavigationRoot
			</property>
			<property name="permissions">
				<element value="Manage portal" />
			</property>
			<property name="visible">True</property>
		</object>

		<object name="disableNavigation" 
		        meta_type="CMF Action"
			    i18n:domain="kup.site.e2p">
			<property name="title" i18n:translate="">
				Disables Navigation
			</property>
			<property name="description" i18n:translate="">
				Deactivates Folder as Navigation 
			</property>
			<property name="url_expr">
				string:${object/absolute_url}/@@disable-NavigationRoot
			</property>
			<property name="icon_expr"></property>
			<property name="available_expr">
				object/@@is-possible-to-disable-NavigationRoot
			</property>
			<property name="permissions">
				<element value="Manage portal" />
			</property>
			<property name="visible">True</property>
		</object>

	</object>
</object>

actions.zcml

<configure xmlns="http://namespaces.zope.org/zope"
	xmlns:browser="http://namespaces.zope.org/browser"
	xmlns:five="http://namespaces.zope.org/five">
	
    <five:implements
        class="Products.ATContentTypes.content.folder.ATFolder"
        interface=".actions.IPossibleNavigationRoot" />	

	<browser:page 
	    name="enable-NavigationRoot" 
	    attribute="enableNavigationRoot"
		for=".actions.IPossibleNavigationRoot"
		class=".actions.ActionsView" 
		permission="cmf.ManagePortal" 
	/>

	<browser:page 
	    name="disable-NavigationRoot"
		attribute="disableNavigationRoot"
		for=".actions.IPossibleNavigationRoot"
		class=".actions.ActionsView" 
		permission="cmf.ManagePortal" 
	/>

	<browser:page 
	    name="is-possible-to-enable-NavigationRoot"
		attribute="isPossibleToEnableNavigationRoot" 
		for="*"
		class=".actions.ActionsView" 
		permission="cmf.ManagePortal"     
	/>

	<browser:page 
	    name="is-possible-to-disable-NavigationRoot"
		attribute="isPossibleToDisableNavigationRoot" 
		for="*"
		class=".actions.ActionsView" 
		permission="cmf.ManagePortal" 
    />

</configure>