Ability to add logic inside widget

[cyberalt1]

One of the most important things holding textual back right now is the ability to do python logic inside a widget.

For example, I want to make a repl in textual. As far as I know this is completely impossible without hundreds of lines of code. Where as in plain python you can do this

while True:
  x = input("?: ")
  print(x)

It would be nice to then just take that while loop and just have a widget that can run that code. Like a container widget that just keeps that output prompt inside of the widget. For example:

def run_code():
 pass

class Myapp(App):
 def compose():
  yield CodeContainer(func=run_code)

This would make it so much easier to write things like REPLs and things that have to respond to user input.

[github-actions[bot]]

We found the following entries in the FAQ which you may find helpful:

• How do I center a widget in a screen?
• Does Textual support images?

Feel free to close this issue if you found an answer in the FAQ. Otherwise, please give us a little time to review.

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This is an automated reply, generated by FAQtory

[davep]

One of the most important things holding textual back right now

Almost 8,000 repos depending on Textual here on GitHub alone, 30,000 stars and counting, hardly a day goes by where I don't see some project mentioned somewhere on the net that isn't built with Python+Textual. It's gonna be crazy once Textual isn't held back any more!

For example, I want to make a repl in textual. As far as I know this is completely impossible without hundreds of lines of code.

I've seen plenty of Textual applications that have a REPL-a-like interface and they don't need hundreds of lines of code to do it. Let's take your input/print example. Here's my quick and simple Textual take on that:

from textual import on
from textual.app import App, ComposeResult
from textual.widgets import Input, OptionList

class SimpleREPLApp(App[None]):

    AUTO_FOCUS = "Input"

    CSS = """
    OptionList {
        padding: 0;
        border: none;
        height: 1fr;
    }
    Input {
        border: none;
        padding: 0;
        height: 1;
    }
    """

    def compose(self) -> ComposeResult:
        yield OptionList()
        yield Input()

    @on(Input.Submitted)
    def _user_input(self, message: Input.Submitted) -> None:
        self.query_one(OptionList).add_option(message.value)
        self.query_one(Input).value = ""

if __name__ == "__main__":
    SimpleREPLApp().run()

Nowhere near 100s of lines, and most of the lines are CSS to style it "just so".