RowHighlighted behavior

[MaineTim]

I'm wondering about the consistency of the behavior of a highlighted row in a datatable. If I run the following code, it will display the table, sorted as requested, with the top row highlighted. But the log generated by hitting space shows that the row currently highlighted isn't actually the same one reported by the most recent RowHighlighted. It's positionally consistent, but not in terms of row key or row content. Aren't the currently highlighted row, and the one reported by the last RowHighlighted, materially out of sync?

Given that's how it works, however, how can I get the key for the row at the index self.table.cursor_row? Can I force a RowHighlighted event after the sort?

Thanks!

from textual.app import App, ComposeResult
from textual.widgets import DataTable, Footer, Header

class Browser(App[None]):

    BINDINGS = [
        ("space", "log_stuff", "Log"),
        ("q", "quit", "Quit"),
    ]

    def __init__(self):
        super(Browser, self).__init__()
        self.data_list = [
            ["JJJ", "KKK", "LLL", "MMM"],
            ["AAA", "BBB", "CCC", "DDD"],
            ["123", "456", "789", "012"],
            ["ZZZ", "YYY", "XXX", "WWW"],
            ["MMM", "OOO", "PPP", "QQQ"]
        ]
        self.current_hi_row = 0
        self.current_hi_row_key = None
        self.current_row = 0
        self.current_row_key = None
        self.enter_pressed = False
        self.column_keys = []
        self.sort_reverse = False

    def action_log_stuff(self):
            self.log(f"Current row: {self.table.get_row_at(self.table.cursor_row)} Current Highlighted Row: {self.table.get_row(self.current_hi_row_key)}")        

    def compose(self) -> ComposeResult:
        yield Header()
        yield DataTable(classes="datatable")
        yield Footer()

    def on_data_table_header_selected(self, event):
        if self.sort_key == event.column_key:
            self.sort_reverse = False if self.sort_reverse else True
        else:
            self.sort_reverse = False
        self.table.sort(event.column_key, self.column_keys[0], reverse=self.sort_reverse)
        self.sort_key = event.column_key

    def on_data_table_row_selected(self, event: DataTable.CellSelected):
        if self.current_row == event.cursor_row or self.enter_pressed:
            self.enter_pressed = False
        self.current_row = event.cursor_row
        self.current_row_key = event.row_key

    def on_data_table_row_highlighted(self, event: DataTable.CellSelected):
        self.current_hi_row = event.cursor_row
        self.current_hi_row_key = event.row_key

    def on_key(self, event):
        if event.key == "enter":
            self.enter_pressed = True

    def on_mount(self) -> None:
        columns = [
            ("First", 10),
            ("Second", 10),
            ("Third", 10),
            ("Fourth", 10),
        ]
        self.table = self.query_one(DataTable)
        self.table.cursor_type = "row"
        for c in columns:
            self.column_keys.append(self.table.add_column(c[0], width=c[1]))
        for item in self.app.data_list:
            self.table.add_row(item[0], item[1], item[2], item[3])
        self.sort_key = self.column_keys[0]
        self.table.sort(self.sort_key)
        self.set_focus(self.table)

if __name__ == "__main__":
    Browser().run()
```

[TomJGooding]

Could you explain what your code is trying to do? Sorry but it is a bit difficult to understand through the red mist of mypy errors in my editor.

[MaineTim]

Hi Tom - Thanks for the reply. The code just tries to illustrate a situation where the highlighted row, as pointed to by a specific key, changes without generating a RowHighlighted event. That confused me because I was thinking of "row" as a discrete collection of data rather than a position. RowHighlighted gets generated when the Y coordinate changes, but not when the key changes. That was my misunderstanding.
So really I had only one question, and in digging deeper to form this reply, I found the answer! So effectively you answered my question, for which I thank you.😀

[TomJGooding]

Haha, well glad I helped in a rubber duck sort of way!