Include stylesheets downstream, including layouts in ChatMessage

panel/chat/message.py

@@ -461,20 +461,20 @@ def _select_renderer(
  contents = contents.decode("utf-8")
  return contents, renderer
 
+ def _include_stylesheets_inplace(self, obj):
+ obj.stylesheets = [
+ stylesheet for stylesheet in self._stylesheets + self.stylesheets
+ if stylesheet not in obj.stylesheets
+ ] + obj.stylesheets
+ if hasattr(obj, "objects"):
+ for o in obj.objects:
+ self._include_stylesheets_inplace(o)
+
  def _set_params(self, obj, **params):
  """
  Set the sizing mode and height of the object.
  """
- if hasattr(obj, "objects"):
- params['css_classes'] = (
- [css for css in obj.stylesheets if css not in self._stylesheets] +
- self._stylesheets
- )
- for subobj in obj.objects:
- self._set_params(subobj)
- obj.param.update(params)
- return
-
+ self._include_stylesheets_inplace(obj)
  is_markup = isinstance(obj, HTMLBasePane) and not isinstance(obj, FileBase)
  if is_markup:
  if len(str(obj.object)) > 0: # only show a background if there is content
@@ -498,6 +498,7 @@ def _create_panel(self, value, old=None):
  """
  if isinstance(value, Viewable):
  self._internal = False
+ self._include_stylesheets_inplace(value)
  return value
 
  renderer = None

panel/tests/chat/test_message.py

@@ -186,6 +186,25 @@ def test_does_not_turn_widget_into_str(self):
  message = ChatMessage(object=button)
  assert message.object == button
 
+ def test_include_stylesheets_inplace_on_layouts(self):
+ message = ChatMessage(
+ Row(Markdown("Hello", css_classes=["message"]), stylesheets=["row.css"]),
+ stylesheets=["chat.css"]
+ )
+ assert message.stylesheets == ["chat.css"]
+ assert message.object.stylesheets == message._stylesheets + ["chat.css", "row.css"]
+
+ # # nested
+ message = ChatMessage(
+ Row(
+ Row(Markdown("Hello", css_classes=["message"]), stylesheets=["row2.css"]),
+ stylesheets=["row.css"]
+ ),
+ stylesheets=["chat.css"]
+ )
+ assert message.object.stylesheets == ChatMessage._stylesheets + ["chat.css", "row.css"]
+ assert message.object.objects[0].stylesheets == ChatMessage._stylesheets + ["chat.css", "row2.css"]
+
  @mpl_available
  def test_can_display_any_python_object_that_panel_can_display(self):
  # For example matplotlib figures