Select imprvements

[cwaldbieser]

It would be nice if the Select widget allowed you to update the renderable part of individual options without resetting the value of the Select. This could be used to dynamically provide markup to some of the displayed options (e.g. make some options turn bold or italic) while preserving the current selection.

[TomJGooding]

It is possible to update the option prompts in the Select widget, but you'd need to know to look under the hood to see that it is constructed using an OptionList.

Here's a quick example:

from textual.app import App, ComposeResult
from textual.widgets import Footer, Select
from textual.widgets._select import SelectOverlay


class ExampleApp(App):
    BINDINGS = [("f1", "update_options", "Update options")]

    def compose(self) -> ComposeResult:
        yield Select.from_values(["bold", "italic", "underline"])
        yield Footer()

    def action_update_options(self) -> None:
        option_list = self.query_one(SelectOverlay)
        for idx, style in enumerate(["bold", "italic", "underline"], start=1):
            option_prompt = option_list.get_option_at_index(idx).prompt
            assert isinstance(option_prompt, str)
            option_list.replace_option_prompt_at_index(
                idx, f"[{style}]{option_prompt}[/]"
            )


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