SelectionList empty

[AndyDralle]

Hey!

After a look at the tutorial, I'm trying to create a minimal program with a SelectionList. This is my current code:

from textual.app import App, ComposeResult
from textual.widgets import Footer, Header, SelectionList
from textual.widgets.selection_list import Selection

class Tags(SelectionList[int]):
    def compose(self) -> ComposeResult:
        yield SelectionList[int](
            # *[(f"Option: {i}", i) for i in range(10)]
            Selection("Wat", 0, True),
            Selection("Meh", 1)
        )

class ExampleApp(App):
    """A tui with a SelectionList."""

    def compose(self) -> ComposeResult:
        yield Header()
        yield Tags()
        yield Footer()

if __name__ == "__main__":
    app = ExampleApp()
    app.run()

This gives me the following output:

As you can see, my options don't appear.

If I run the SelectionList example from https://textual.textualize.io/widgets/selection_list/#__tabbed_1_2, things work as intended. But I don't want my entire app to be a SelectionList like in that example. I just want this to be one of multiple widgets in my tui, like in the tutorial. That's why I'm trying to adapt the tutorial code, instead of just copying the SelectionList example directly.

Can somebody spot what I'm missing here?
Thanks in advance!

[TomJGooding]

The problem is that you're trying to compose a SelectionList inside another SelectionList, which isn't going to work.

If you want your widget to be a subclass of SelectionList, you can initialize it using super().__init__() and pass in your options:

class MySelectionList(SelectionList):
    def __init__(self) -> None:
        selections = [("First", 1), ("Second", 2)]
        super().__init__(*selections)