How do I create an interactive button?

[ethansocal]

Is it possible to create a button that when pressed, triggers an event?

[willmcgugan]

Documentation is coming, but the basic principle is you have a widget with an on_click method and you emit a message.

from textual.message import Message

class ButtonPressed(Message, bubble=True):
    pass

class Button(Widget):
    async def on_click(self, event: events.Click) -> None:
        await self.emit(ButtonPressed(self))

Then in the parent view / app you can catch the message with the following:

async def message_button_event(self, message: ButtonPressed) -> None:
    # button handler

[willmcgugan]

Check out the updated calculator example.

[ThatXliner]

How about on a custom Widget?