Some binding on footer are hidden when type content in input

[Tim-Cao]

Could you help me investigate why some binding on footer are hidden when type content in input?

Binding.mp4

    BINDINGS = [
        Binding("ctrl+c", "quit", "Quit"),
        Binding("shift+insert", "paste", "Paste"),
        Binding("ctrl+u", "delete_left_all", "Delete all to the left")
    ]


        yield Header()
        with Horizontal(id='main-content'):
            yield ListView(
                ListItem(Static("Forward Failure PR", classes="nav-item"), id="nav-1"),
                ListItem(Static("Create PR and Forward", classes="nav-item"), id="nav-2"),
                ListItem(Static("Create TF Ticket", classes="nav-item"), id="nav-3"),
                ListItem(Static("Write Comments", classes="nav-item"), id="nav-4"),
                ListItem(Static("Write Description", classes="nav-item"), id="nav-5")
            )
            with ContentSwitcher(initial="nav-1"):
                with VerticalScroll(id="nav-1"):
                    yield Label("Enter the failure pull request number: ")
                    yield Input(id='failure-pull-request-number')
                with VerticalScroll(id="nav-2"):
                    yield Label("Enter the local branch name: ")
                    yield Input(id='local-branch')
                with VerticalScroll(id="nav-3"):
                    yield Label("Enter the case result id: ")
                    yield Input(id='case-result-id')
                with VerticalScroll(id="nav-4"):
                    yield Label("Enter the Jira ticket number: ")
                    yield Input(id='jira-ticket-number-4')
                with VerticalScroll(id="nav-5"):
                    DESCRIPTION_TYPE = [
                        ("Steps to reproduce", "STR"),
                        ("Test Cases", "TC")
                    ]

                    yield Label("Enter the Jira ticket number: ")
                    yield Input(id='jira-ticket-number-5')
        yield Output(highlight=True, markup=True)
        yield Footer()

[davep]

That's because Ctrl+U is a binding of Input and all of the bindings of Input are marked as show=False.

[Tim-Cao]

Do you mean the only way to override is to create a custom input widget not the default input widget?

[davep]

Tom and I are both pointing out that to bind an Input action you would need to do so on a widget derived from Input.

[Tim-Cao]

I see. It makes codes a little bit verbose. Anyway, thanks

[TomJGooding]

Just to add to davep's post, here's a simple example which I hope will help explain this:

from textual.app import App, ComposeResult
from textual.widgets import Input, Footer
from textual.binding import Binding


class ExampleApp(App):
    BINDINGS = [
        Binding("ctrl+c", "quit", "Quit"),
        Binding("ctrl+x", "delete_left_all", "Delete all to the left"),
    ]

    def compose(self) -> ComposeResult:
        yield Input("Delete me!")
        yield Footer()


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

Try pressing ctrl+x. This won't do anything, as there is no such method in the app. If you check the logs in textual console:

<action> 'delete_left_all' has no target. Could not find methods '_action_delete_left_all' or 'action_delete_left_all'