@ThThoma said in Detect top/parent move event on child widget:

However, what if I have multiple floating widgets that track their "parent" movements?

You'd have multiple event filters.

And I'm answering: probably the delay from the multiple filters will start to get noticeable...

I really doubt it, as long as you don't have too many. If you keep the event processing responsive, you shouldn't notice it at all. Personally, I'd rather have the window in a layout, or if it's really floating, then leave it be, but ymmv.