Load content chooser resources only on compose mode

src/collective/cover/browser/configure.zcml

@@ -0,0 +1,13 @@
+<configure
+    xmlns="http://namespaces.zope.org/zope"
+    xmlns:browser="http://namespaces.zope.org/browser">
+
+    <browser:page
+        name="cover_helper"
+        for="*"
+        permission="zope.Public"
+        class=".utils.Helper"
+        allowed_interface=".interfaces.IHelper"
+        />
+
+</configure>

src/collective/cover/browser/interfaces.py

@@ -0,0 +1,15 @@
+from zope.interface import Interface
+
+
+class IHelper(Interface):
+
+    """Helper view used to determine if resources are being loaded or not."""
+
+    def is_view_mode():
+        """True if we are in the context of a cover object in view mode."""
+
+    def is_compose_mode():
+        """True if we are in the context of a cover object in compose mode."""
+
+    def is_layout_mode():
+        """True if we are in the context of a cover object in layout mode."""

src/collective/cover/browser/utils.py

@@ -0,0 +1,36 @@
+# -*- coding: utf-8 -*-
+from Acquisition import aq_inner
+from collective.cover.browser.interfaces import IHelper
+from collective.cover.interfaces import ICover
+from Products.Five.browser import BrowserView
+from zope.interface import implements
+
+
+class Helper(BrowserView):
+
+    """Helper view used to determine if resources are being loaded or not."""
+
+    implements(IHelper)
+
+    def __call__(self):
+        self.context = aq_inner(self.context)
+        self.is_cover = ICover.providedBy(self.context)
+        # the name of the template is in the parent request
+        if self.is_cover and 'PARENT_REQUEST' in self.request:
+            # template name is the last part of the URL
+            url = self.request.PARENT_REQUEST.URL
+            self.mode = url.split('/')[-1]
+        else:
+            self.mode = ''
+
+    def is_view_mode(self):
+        """True if we are in the context of a cover object in view mode."""
+        return self.mode == 'view'
+
+    def is_compose_mode(self):
+        """True if we are in the context of a cover object in compose mode."""
+        return self.mode == 'compose'
+
+    def is_layout_mode(self):
+        """True if we are in the context of a cover object in layout mode."""
+        return self.mode == 'layout'

src/collective/cover/configure.zcml

@@ -22,6 +22,7 @@
   <include file="profiles.zcml" />
   <include file="subscribers.zcml" />
 
+  <include package=".browser" />
   <!-- five.grok 1.3.2 will not register this by itself -->
   <browser:resourceDirectory
       name="collective.cover"

src/collective/cover/profiles/default/cssregistry.xml

@@ -1,9 +1,10 @@
 <?xml version="1.0"?>
 <object name="portal_css" meta_type="Stylesheets Registry">
  <stylesheet title="" cacheable="True" compression="safe" cookable="True"
-    enabled="1" expression="" id="++resource++collective.cover/contentchooser.css" media="screen"
-    rel="stylesheet" rendering="link"/>
+    enabled="1" expression="python:portal.restrictedTraverse('@@cover_helper').is_compose_mode()"
+    id="++resource++collective.cover/contentchooser.css" media="screen"
+    rel="stylesheet" rendering="link" authenticated="True" />
  <stylesheet title="" cacheable="True" compression="safe" cookable="True"
     enabled="1" expression="" id="++resource++collective.cover/cover.css" media="screen"
-    rel="stylesheet" rendering="link"/>
+    rel="stylesheet" rendering="link" />
 </object>

src/collective/cover/profiles/default/jsregistry.xml

@@ -2,7 +2,8 @@
 <object name="portal_javascripts">
   <javascript id="++resource++collective.cover/contentchooser.js"
       cacheable="True" compression="none" cookable="True" enabled="True"
-      expression="" inline="False" authenticated="True" />
+      expression="python:portal.restrictedTraverse('@@cover_helper').is_compose_mode()"
+      inline="False" authenticated="True" />
   <javascript id="++resource++collective.js.bootstrap/js/bootstrap.min.js"
       cacheable="True" compression="none" cookable="True" enabled="True"
       expression="" inline="False" />