Scrolling with the keyboard.

[AdreamCZ]

Hello,
I have a window with several buttons (added dynamically, so I don't know how many beforehand ) under each other. Overflow is set to SCROLL which works fine when navigating with the mouse, but when I want to select these buttons with the arrow keys and I select a button that is offscreen, the "list" doesn't scroll down and the selected button is not visible.
How should I implement that the list scrolls down (or up), when a button that is offscreen is selected ?
Thanks

[bczsalba]

Oh golly, I had an answer written up to this days ago!

At the moment there is no (easy) way to detect when a widget goes off screen sadly. At some point in the near-ish future we will have a better scrolling implementation that will allow this to happen, however.

You can see an example of me hacking around this same limitation in the InputField source:

pytermgui/pytermgui/widgets/input_field.py

Lines 428 to 457 in 9e5e708

	# TODO: This is horribly hackish, but is the only way to "get around" the
	# limits of the current scrolling techniques. Should be refactored
	# once a better solution is available
	if self.parent is not None and self.selected_index is not None:
	offset = 0
	parent = self.parent
	while hasattr(parent, "parent"):
	offset += getattr(parent, "_scroll_offset")
	parent = parent.parent # type: ignore
	offset_row = -offset + row
	offset_col = start + (len(self.prompt) if row == 0 else 0)
	if offset_col > self.width - 1:
	offset_col -= self.width
	offset_row += 1
	row += 1
	if row >= len(lines):
	lines.append(self.styles.value(""))
	position = (
	self.pos[0] + offset_col,
	self.pos[1] + offset_row,
	)
	self.positioned_line_buffer.append(
	(position, style_cursor(cursor_char)) # type: ignore
	)

If you want to play around with it, I would suggest testing widgets against the container's content_dimensions property. I tried my hand at quickly hacking something together, but I didn't have the time to make it work too well sadly.