How do you find the y-coordinate of a widget in a VerticalLayout

[brentmparker]

I'm starting to learn Textual from the main branch (I'm very much looking forward to the CSS branch becoming more stable. It looks awesome!) and needed a scrolling list of widgets. Looking through the discussions I found this code from another user. It seems to work alright, but I also want the feature to be able to cycle through the widgets with the keyboard and scroll a widget into view when it is focused on.

I came up with the very hacky solution below, but I don't like it. When I find a focusable widget, I have to use the widget's parent's _cached_arrangement to get the region.

    async def _cycle_focus(self, direction: int = 1) -> None:
        idx = 0
        widgets: List[Widget] = self.window._widgets
        if self._last_focused is not None:
            idx = min(len(widgets), max(0, widgets.index(self._last_focused)))
            idx = clamp(idx + direction, 0, len(widgets) - 1)

        # Find the next focusable widget, or stop at first/last widget
        while not widgets[idx].can_focus and (idx > 0 or idx < len(widgets)):
            idx += direction

        if widgets[idx].can_focus:
            widget = widgets[idx]
            self._last_focused = widget

            # I don't like using _cached_arrangement
            # This seems way too hacky
            # How else can I get the y-coordinate of the widget in a VerticalLayout?
            arrangement: List[WidgetPlacement] = widget.parent._cached_arrangement[2]
            widget_placement: WidgetPlacement = [
                wa for wa in arrangement if wa.widget == widget
            ]
            if widget_placement and len(widget_placement) > 0:
                region = widget_placement[0].region
                line = region.y + widget.size.height // 2
                self.scroll_to_center(line)
            await widget.focus()

Any suggestions on how to find the y-coordinate of a widget? I tried self.get_widget_region but that causes a crash because VerticalLayouts dont' create a _layout_map.

Thanks for your time!