Easiest way to detect all widgets beneath the mouse?

[waynew]

So, we have Enter and https://textual.textualize.io/api/screen/#textual.screen.HoverWidgets.mouse_over which are generally pretty good.

But they have a limitation. Use layers to put a widget in front of another widget, and the mouse_over is no longer accurate. Well, sort of.

I mean, arguably, I would be fine except when I do:

def on_mouse_up(self) -> None:
    self.query_one("#top_widget").remove()
    log(self.app.mouse_over)

I would expect that the mouse_over would be the current widget directly beneath the mouse, however it isn't. It's the widget that I just removed. In fact, generally, moving the mouse around won't track any mouse events on any of the lower widgets, just the one that is currently under the mouse. I had hoped that changing it to call_later would help:

def on_mouse_up(self) -> None:
    self.query_one("#top_widget").remove()
    self.call_later(what_widget)

def what_widget(self) -> None:
    log(self.app.mouse_over)

But alas, it doesn't. It still reports the widget that the mouse had been on.

I can add

def on_mouse_up(self, event: events.MouseUp) -> None:
    log(event.screen_x, event.screen_y)

which will give me the point on the screen, and there is this answer/discussion which seems to have an option for detecting the widgets that are at a particular location on the screen...

Is there any better way to do what I'm trying to do here, which is to say, detect the widget(s) that occupy a screen location? (I can use the widget ID to figure out if it's the one that I want)

[waynew]

Ahah! I had searched the docs for _at and location and a whole bunch of other terms that didn't get me anything. I decided to Use the Source, Luke, especially since I already had the source locally so I could check out the demo code.

I knew the mouse_over attribute existed so I went and found where that was, which led me to a few places ending up at the get_widgets_at function. That actually gives me exactly what I need:

for widget in self.screen.get_widgets_at(*self.mouse_position):
    if widget.id and widget.id.startswith('some-col-'):
         widget.mount(my_new_widget)