Textual Event and Message Handling

Purpose

Implement robust event handling and inter-widget communication in Textual using messages, keyboard bindings, and action dispatch. Messages enable loose coupling between components.

Quick Start

from textual.message import Message
from textual.app import App, ComposeResult
from textual.widgets import Button, Static
from textual import on

class ItemWidget(Static):
    """Widget that emits custom messages."""