XBlocks can disable navigation chrome.

There is an option to:
* Enable/disable accordion navigation
* Enable/disable/repoint tab navigation

This allows for full-screen XBlocks (e.g. a code IDE, or large video
player). It is also the first pass at allowing top-level XBlocks. It's
also now possible to make a chromeless XBlock, point a tab to it, and
make it point back to that tab.

Next steps down that path would be:
* Fix up how tabs are handled. The current version is a hack.
* Create appropriate XBlocks for courseware, tabbed navigation,
  etc. to reach feature parity
* Invert/rejigger the XML format.

common/lib/xmodule/xmodule/contentstore/mongo.py

@@ -147,7 +147,15 @@ class MongoContentStore(ContentStore):
 
         for asset in assets:
             asset_location = AssetLocation._from_deprecated_son(asset['_id'], course_key.run)  # pylint: disable=protected-access
-            self.export(asset_location, output_directory)
+            # TODO: On 6/19/14, I had to put a try/except around this
+            # to export a course. The course failed on JSON files in
+            # the /static/ directory placed in it with an import.
+            # 
+            # If this hasn't been looked at in a while, remove this comment. 
+            #
+            # When debugging course exports, this might be a good place
+            # to look. -- pmitros
+            self.export(asset_location, output_directory) 
             for attr, value in asset.iteritems():
                 if attr not in ['_id', 'md5', 'uploadDate', 'length', 'chunkSize']:
                     policy.setdefault(asset_location.name, {})[attr] = value

lms/djangoapps/courseware/tests/test_navigation.py

@@ -28,17 +28,38 @@ class TestNavigation(ModuleStoreTestCase, LoginEnrollmentTestCase):
 
         self.test_course = CourseFactory.create(display_name='Robot_Sub_Course')
         self.course = CourseFactory.create(display_name='Robot_Super_Course')
-        self.chapter0 = ItemFactory.create(parent_location=self.course.location,
+        self.chapter0 = ItemFactory.create(parent=self.course,
                                            display_name='Overview')
-        self.chapter9 = ItemFactory.create(parent_location=self.course.location,
+        self.chapter9 = ItemFactory.create(parent=self.course,
                                            display_name='factory_chapter')
-        self.section0 = ItemFactory.create(parent_location=self.chapter0.location,
+        self.section0 = ItemFactory.create(parent=self.chapter0,
                                            display_name='Welcome')
-        self.section9 = ItemFactory.create(parent_location=self.chapter9.location,
+        self.section9 = ItemFactory.create(parent=self.chapter9,
                                            display_name='factory_section')
-        self.unit0 = ItemFactory.create(parent_location=self.section0.location,
+        self.unit0 = ItemFactory.create(parent=self.section0,
                                         display_name='New Unit')
 
+        self.chapterchrome = ItemFactory.create(parent=self.course,
+                                                display_name='Chrome')
+        self.chromelesssection = ItemFactory.create(parent=self.chapterchrome,
+                                                    display_name='chromeless',
+                                                    chrome='none')
+        self.accordionsection = ItemFactory.create(parent=self.chapterchrome,
+                                                   display_name='accordion',
+                                                   chrome='accordion')
+        self.tabssection = ItemFactory.create(parent=self.chapterchrome,
+                                              display_name='tabs',
+                                              chrome='tabs')
+        self.defaultchromesection = ItemFactory.create(parent=self.chapterchrome,
+                                             display_name='defaultchrome')
+        self.fullchromesection = ItemFactory.create(parent=self.chapterchrome,
+                                                    display_name='fullchrome',
+                                                    chrome='accordion,tabs')
+        self.tabtest = ItemFactory.create(parent=self.chapterchrome,
+                                          display_name='progress_tab',
+                                          default_tab = 'progress')
+
+
         # Create student accounts and activate them.
         for i in range(len(self.STUDENT_INFO)):
             email, password = self.STUDENT_INFO[i]
@@ -48,6 +69,50 @@ class TestNavigation(ModuleStoreTestCase, LoginEnrollmentTestCase):
 
         self.staff_user = GlobalStaffFactory()
 
+    def test_chrome_settings(self):
+        '''
+        Test settings for disabling and modifying navigation chrome in the courseware: 
+        - Accordion enabled, or disabled
+        - Navigation tabs enabled, disabled, or redirected
+        '''
+        email, password = self.STUDENT_INFO[0]
+        self.login(email, password)
+        self.enroll(self.course, True)
+
+        test_data = (
+            ('tabs', False, True),
+            ('none', False, False),
+            ('fullchrome', True, True),
+            ('accordion', True, False),
+            ('fullchrome', True, True))
+        for (displayname, accordion, tabs) in test_data:
+            response = self.client.get(reverse('courseware_section', kwargs={
+                        'course_id': self.course.id.to_deprecated_string(),
+                        'chapter': 'Chrome',
+                        'section': displayname,
+                        }))
+            self.assertEquals('open_close_accordion' in response.content, accordion)
+            self.assertEquals('course-tabs' in response.content, tabs)
+        
+        def tab_active(tabname, response):
+            ''' Check if the progress tab is active in the tab set ''' 
+            for line in response.content.split('\n'):
+                if tabname in line and 'active' in line:
+                    return True
+            return False
+
+        self.assertFalse(tab_active('progress', response))
+        self.assertTrue(tab_active('courseware', response))
+
+        response = self.client.get(reverse('courseware_section', kwargs={
+                    'course_id': self.course.id.to_deprecated_string(),
+                    'chapter': 'Chrome',
+                    'section': 'progress_tab',
+                    }))
+
+        self.assertTrue(tab_active('progress', response))
+        self.assertFalse(tab_active('courseware', response))
+
     @override_settings(SESSION_INACTIVITY_TIMEOUT_IN_SECONDS=1)
     def test_inactive_session_timeout(self):
         """

lms/djangoapps/courseware/views.py

@@ -338,6 +338,7 @@ def index(request, course_id, chapter=None, section=None,
 
         if section is not None:
             section_descriptor = chapter_descriptor.get_child_by(lambda m: m.location.name == section)
+
             if section_descriptor is None:
                 # Specifically asked-for section doesn't exist
                 if masq == 'student':  # if staff is masquerading as student be kinder, don't 404
@@ -345,6 +346,17 @@ def index(request, course_id, chapter=None, section=None,
                     return redirect(reverse('courseware', args=[course.id.to_deprecated_string()]))
                 raise Http404
 
+            ## Allow chromeless operation
+            if section_descriptor.chrome:
+                chrome = [s.strip() for s in section_descriptor.chrome.lower().split(",")]
+                if 'accordion' not in chrome:
+                    del context['accordion']
+                if 'tabs' not in chrome:
+                    context['disable_tabs'] = True
+
+            if section_descriptor.default_tab:
+                context['default_tab'] = section_descriptor.default_tab
+
             # cdodge: this looks silly, but let's refetch the section_descriptor with depth=None
             # which will prefetch the children more efficiently than doing a recursive load
             section_descriptor = modulestore().get_item(section_descriptor.location, depth=None)

lms/lib/xblock/mixin.py

@@ -18,5 +18,20 @@ class LmsBlockMixin(XBlockMixin):
              "grader to apply, and what to show in the TOC)",
         scope=Scope.settings,
     )
+    chrome = String(
+        help="Which chrome to show. Options: "
+             "chromeless -- No chrome"
+             "tabs -- just tabs"
+             "accordion -- just accordion"
+             "tabs,accordion -- Full Chrome",
+        scope=Scope.settings,
+        default = None,
+    )
+    default_tab = String(
+        help="Override which tab is selected."
+             "If not set, courseware tab is shown.",
+        scope=Scope.settings,
+        default = None,
+    )
     source_file = String(help="source file name (eg for latex)", scope=Scope.settings)
     ispublic = Boolean(help="Whether this course is open to the public, or only to admins", scope=Scope.settings)

lms/templates/courseware/course_navigation.html

@@ -20,12 +20,13 @@ def url_class(is_active):
 <%! from courseware.views import notification_image_for_tab %>
 <% import waffle %>
 
+% if disable_tabs is UNDEFINED:
 <nav class="${active_page} course-material">
   <div class="inner-wrapper">
     <ol class="course-tabs">
       % for tab in CourseTabList.iterate_displayable(course, settings, user.is_authenticated(), has_access(user, 'staff', course, course.id)):
         <%
-            tab_is_active = (tab.tab_id == active_page)
+            tab_is_active = (tab.tab_id == active_page) or (tab.tab_id == default_tab)
             tab_image = notification_image_for_tab(tab, user, course)
         %>
         % if waffle.flag_is_active(request, 'visual_treatment'):
@@ -55,6 +56,7 @@ def url_class(is_active):
     </ol>
   </div>
 </nav>
+%endif
 
 % if masquerade is not UNDEFINED:
   % if staff_access and masquerade is not None:

lms/templates/courseware/courseware.html

@@ -179,8 +179,10 @@ ${fragment.foot_html()}
 </div>
 % endif
 
-% if accordion:
   <%include file="/dashboard/_dashboard_prompt_midcourse_reverify.html" />
+% if default_tab:
+  <%include file="/courseware/course_navigation.html" />
+% else:
   <%include file="/courseware/course_navigation.html" args="active_page='courseware'" />
 % endif