def on_source_changed()

in client/securedrop_client/gui/widgets.py [0:0]

• 25 lines of code
• 8 McCabe index (conditional complexity)

    def on_source_changed(self) -> None:
        """
        Show conversation for the selected source, or, if multiple sources are selected,
        show multi select view.
        """

        selected = len(self.source_list.selectedItems())
        if selected == 1:
            # One source selected; prepare the conversation widget
            try:
                source = self.source_list.get_selected_source()

                # Avoid race between user selection and remote deletion
                if not source:
                    return

                self.controller.session.refresh(source)

                # Immediately show the selected source as seen in the UI and then make a
                # request to mark source as seen.
                self.source_list.source_selected.emit(source.uuid)
                self.controller.mark_seen(source)

                # Get or create the SourceConversationWrapper
                if source.uuid in self.source_conversations:
                    conversation_wrapper = self.source_conversations[source.uuid]
                    conversation_wrapper.conversation_view.update_conversation(  # type: ignore[has-type]
                        source.collection
                    )
                else:
                    conversation_wrapper = SourceConversationWrapper(
                        source, self.controller, self._state
                    )
                    self.source_conversations[source.uuid] = conversation_wrapper

                # Put this widget into the QStackedLayout at the correct position
                self.set_conversation(conversation_wrapper)
                logger.debug(f"Set conversation to the selected source with uuid: {source.uuid}")

            except sqlalchemy.exc.InvalidRequestError as e:
                logger.debug(e)

        # Now show the right widget depending on the selection
        self._on_update_conversation_context()