unselect a selected cell in a data table

[nnako]

Hi,

whenever I click on a cell within my data table, there is created a yellow background and a black foreground for that cell. As soon as I click somewhere else, this selection mark disappears at its old location and appears at the new cell location clicked.

Now, I want to neutralize the cell selection mark without having to click on another cell (and thus, without creating another mark):

Is there a way to programmatically reset a cell's selection mark after it has been set via mouse click?

[nnako]

Or would it be possible to just set the cell selection mark to an arbitrary location within the data table without using mouse or keyboard activity? I've tried this, but it didn't seem to work:

# get table from DOM
table = self.query_one(DataTable)

# reset selection
table.CellSelected.cell_key = table.coordinate_to_cell_key(
    textual.coordinate.Coordinate(
        row=1,
        column=0,
        )
    )

[TomJGooding]

The coordinate of the cursor is exposed via the cursor_coordinate reactive attribute, if that's what you mean? https://textual.textualize.io/widgets/data_table/#cursors

[nnako]

ok. thanks. Indeed, I can use the move_cursor() method of the DataTable. Unfortunately, I want to just move the cursor out of sight, e.g. at position 0,0 of the table. The problem is that even though I use the parameter scroll=False, the table scrolls in the way that the formerly visible table content moves out of sight (as if I had chosen scroll=True).

Is there an other way to "neutralize" the cursor away from the last clicked location?

[TomJGooding]

Sorry, I don't really understand what you're asking or what you mean by "neutralize" the cursor.

When you click a cell, what do you want the cursor to do exactly? After it has been "neutralized", what happens if you then navigate to new cell with the keyboard or the mouse?

[nnako]

Sorry, I don't really understand what you're asking or what you mean by "neutralize" the cursor.

When you click a cell, what do you want the cursor to do exactly? After it has been "neutralized", what happens if you then navigate to new cell with the keyboard or the mouse?

Normally, when moving the mouse pointer across the visible data table, while having the data table's parameter cursor_type set to cell, below the mouse pointer, the table cursor dynamically changes its background color (in my case) to dark yellow. That's fine.

Now, when pressing the left mouse button, the respective cell's background color turns (in my case) into a strong yellow. And stays yellow until I press the left mouse button above another cell. So, I can use the mouse to select a cell I want to do something with, programmatically.

I use the user's selecting a cell (it turns strong yellow) as a trigger to perform some operations based on the selected cell's location. E.g. setting its text-background color to a certain value (as seen in this post).

After programmatically coloring the cell's text-background, I want to get rid of the strong yellow marker of the formerly selected cell. I could set it to another column (e.g. to highlight the row header), but I would rather like to know if I can just switch off the selection mark for a cell, programmatically.