def __init__(self, viewer: Viewer) -> None:
            """Initialise the message.

            Args:
                viewer: The viewer sending the message.
            """
            super().__init__()
            self.viewer: Viewer = viewer
            """The viewer that sent the message."""
Initialise the message.

            Args:
                viewer: The viewer sending the message.
            
frogmouth/widgets/viewer.py