Add register_page_action_menu_item hook

docs/reference/hooks.rst

@@ -493,6 +493,46 @@ Hooks for customising the way users are directed through the process of creating
   Uses the same behaviour as ``before_create_page``.
 
 
+.. _register_page_action_menu_item:
+
+``register_page_action_menu_item``
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+  Add an item to the popup menu of actions on the page creation and edit views. The callable passed to this hook must return an instance of ``wagtail.admin.views.pages.ActionMenuItem``. The following attributes and methods are available to be overridden on subclasses of ``ActionMenuItem``:
+
+  :order: an integer (default 100) which determines the item's position in the menu. Can also be passed as a keyword argument to the object constructor
+  :label: the displayed text of the menu item
+  :get_url: a method which returns a URL for the menu item to link to; by default, returns ``None`` which causes the menu item to behave as a form submit button instead
+  :name: value of the ``name`` attribute of the submit button, if no URL is specified
+  :is_shown: a method which returns a boolean indicating whether the menu item should be shown; by default, true except when editing a locked page
+  :template: path to a template to render to produce the menu item HTML
+  :get_context: a method that returns a context dictionary to pass to the template
+  :render_html: a method that returns the menu item HTML; by default, renders ``template`` with the context returned from ``get_context``
+
+  The ``get_url``, ``is_shown``, ``get_context`` and ``render_html`` methods all accept a request object and a context dictionary containing the following fields:
+
+  :view: name of the current view: ``'create'``, ``'edit'`` or ``'revisions_revert'``
+  :page: For ``view`` = ``'edit'`` or ``'revisions_revert'``, the page being edited
+  :parent_page: For ``view`` = ``'create'``, the parent page of the page being created
+  :user_page_permissions: a ``UserPagePermissionsProxy`` object for the current user, to test permissions against
+
+  .. code-block:: python
+
+    from wagtail.core import hooks
+    from wagtail.admin.views.pages import ActionMenuItem
+
+    class GuacamoleMenuItem(ActionMenuItem):
+        label = "Guacamole"
+
+        def get_url(self, request, context):
+            return "https://www.youtube.com/watch?v=dNJdJIwCF_Y"
+
+
+    @hooks.register('register_page_action_menu_item')
+    def register_guacamole_menu_item():
+        return GuacamoleMenuItem(order=10)
+
+
 .. _construct_wagtail_userbar:
 
 ``construct_wagtail_userbar``

wagtail/admin/tests/test_pages_views.py

@@ -663,6 +663,8 @@ class TestPageCreation(TestCase, WagtailTestUtils):
         self.assertEqual(response.status_code, 200)
         self.assertContains(response, '<a href="#tab-content" class="active">Content</a>')
         self.assertContains(response, '<a href="#tab-promote" class="">Promote</a>')
+        # test register_page_action_menu_item hook
+        self.assertContains(response, '<input type="submit" name="action-panic" value="Panic!" class="button" />')
 
     def test_create_multipart(self):
         """
@@ -1274,6 +1276,9 @@ class TestPageEdit(TestCase, WagtailTestUtils):
         self.assertContains(response, '<legend>Speaker lineup</legend>')
         self.assertContains(response, 'Add speakers')
 
+        # test register_page_action_menu_item hook
+        self.assertContains(response, '<input type="submit" name="action-panic" value="Panic!" class="button" />')
+
     def test_edit_draft_page_with_no_revisions(self):
         # Tests that the edit page loads
         response = self.client.get(reverse('wagtailadmin_pages:edit', args=(self.unpublished_page.id, )))

wagtail/admin/views/pages.py

@@ -133,12 +133,23 @@ class DeleteMenuItem(ActionMenuItem):
         return reverse('wagtailadmin_pages:delete', args=(context['page'].id,))
 
 
-ACTION_MENU_ITEMS = [
-    UnpublishMenuItem(order=10),
-    DeleteMenuItem(order=20),
-    PublishMenuItem(order=30),
-    SubmitForModerationMenuItem(order=40),
-]
+ACTION_MENU_ITEMS = None
+
+
+def _get_action_menu_items():
+    global ACTION_MENU_ITEMS
+
+    if ACTION_MENU_ITEMS is None:
+        ACTION_MENU_ITEMS = [
+            UnpublishMenuItem(order=10),
+            DeleteMenuItem(order=20),
+            PublishMenuItem(order=30),
+            SubmitForModerationMenuItem(order=40),
+        ]
+        for hook in hooks.get_hooks('register_page_action_menu_item'):
+            ACTION_MENU_ITEMS.append(hook())
+
+    return ACTION_MENU_ITEMS
 
 
 def get_valid_next_url_from_request(request):
@@ -416,7 +427,7 @@ def create(request, content_type_app_name, content_type_model_name, parent_page_
         'page_class': page_class,
         'parent_page': parent_page,
         'edit_handler': edit_handler,
-        'action_menu_items': ACTION_MENU_ITEMS,
+        'action_menu_items': _get_action_menu_items(),
         'preview_modes': page.preview_modes,
         'form': form,
         'next': next_url,
@@ -646,7 +657,7 @@ def edit(request, page_id):
         'content_type': content_type,
         'edit_handler': edit_handler,
         'errors_debug': errors_debug,
-        'action_menu_items': ACTION_MENU_ITEMS,
+        'action_menu_items': _get_action_menu_items(),
         'preview_modes': page.preview_modes,
         'form': form,
         'next': next_url,
@@ -1257,7 +1268,7 @@ def revisions_revert(request, page_id, revision_id):
         'content_type': content_type,
         'edit_handler': edit_handler,
         'errors_debug': None,
-        'action_menu_items': ACTION_MENU_ITEMS,
+        'action_menu_items': _get_action_menu_items(),
         'preview_modes': page.preview_modes,
         'form': form,  # Used in unit tests
     })

wagtail/tests/testapp/wagtail_hooks.py

@@ -6,6 +6,7 @@ import wagtail.admin.rich_text.editors.draftail.features as draftail_features
 from wagtail.admin.menu import MenuItem
 from wagtail.admin.rich_text import HalloPlugin
 from wagtail.admin.search import SearchArea
+from wagtail.admin.views.pages import ActionMenuItem
 from wagtail.core import hooks
 
 
@@ -104,3 +105,13 @@ def register_blockquote_feature(features):
             css={'all': ['testapp/css/draftail-blockquote.css']},
         )
     )
+
+
+class PanicMenuItem(ActionMenuItem):
+    label = "Panic!"
+    name = 'action-panic'
+
+
+@hooks.register('register_page_action_menu_item')
+def register_panic_menu_item():
+    return PanicMenuItem()