How to update DataTable cell?

[alexveden]

I need to update text inside datatable cells dynamically, but didn't find any references to public special methods or fields for data changes.

Here is a simple usage case: I need to have a links in the table which trigger some background tasks. And I need to change the first column ('Status') of the datatable to a 'Loading...' text.

I found a workaround, maybe a hacky one. However there are still issues:

1. Changed data seem not to persist
2. Status column is not resized properly

Maybe this feature is not implemented yet, and we need to wait for #1638

from textual.app import App
from textual.widgets import Header, Footer
from textual.containers import Container
from textual.widgets import DataTable, ListView, ListItem, Label, Button
from textual.widget import Widget
from datetime import datetime


class TableTestApp(App):
    BINDINGS = [("d", "toggle_dark", "Toggle dark mode")]

    def compose(self):
        """Create child widgets for the app."""
        yield Header()
        yield Label('Select row', id='label')
        yield DataTable(id='data_table')
        yield Footer()

    def on_mount(self):
        table: DataTable = self.query_one('#data_table', DataTable)
        table.cursor_type = 'row'
        table.add_columns('Status', 'File', 'Log', 'Run')

        table.add_row('OK', 'my1.py', '--',   f"[@click=run(0, 'Loading...')]RunMe[/]")
        table.add_row('WARN', 'my2.py', '--',   f"[@click=run(1, 'test1')]RunMe[/]")
        table.add_row('ERR', 'my3.py', f"[@click=show_log('abs')]ShowLog[/]", f"[@click=run(2, 'test')]RunMe[/]")

    # 
    # def on_data_table_row_selected(self, event):
    #      label = self.query_one('#label', Label)
    #      label.update(f'Row selected: {event.cursor_row}')
    def action_run(self, row_idx, t):
        table: DataTable = self.query_one('#data_table', DataTable)
        table.data[row_idx][0] = t

if __name__ == "__main__":
    #print("Hello world")
    app = TableTestApp()
    app.run()