Method post_message

src/textual/widget.py:4486–4508

Post a message to this widget. Args: message: Message to post. Returns: True if the message was posted, False if this widget was closed / closing.

(self, message: Message)

        await self.app.run_action(action, self, namespaces)

    def post_message(self, message: Message) -> bool:
        """Post a message to this widget.

        Args:
            message: Message to post.

        Returns:
            True if the message was posted, False if this widget was closed / closing.
        """
        _rich_traceback_omit = True
        # Catch a common error.
        # This will error anyway, but at least we can offer a helpful message here.
        if not hasattr(message, "_prevent"):
            raise RuntimeError(
                f"{type(message)!r} is missing expected attributes; did you forget to call super().__init__() in the constructor?"
            )

        if constants.DEBUG and not self.is_running and not message.no_dispatch:
            try:
                self.log.warning(self, f"IS NOT RUNNING, {message!r} not sent")
            except NoActiveAppError:
                pass
        return super().post_message(message)

    async def on_prune(self, event: messages.Prune) -> None:
        """Close message loop when asked to prune."""