How to do a scrollable panel (containing windows)

[konradmoesch]

Hi!
I want to create some kind of flowchart editor. The app should have nodes (grouped ui elements or, preferably, egui::Windows), which can then be connected using lines.
Having blocks and painting the connections works. However, the diagrams tend to get larger than the viewable screen. Is there a way to add scrolling to a panel?
Ideally, I'd also like to have zooming of this viewport.
Basically, I am looking for a behaviour similar to the of egui_plot::Plot, where I can move and zoom the viewport of the Plot.

A MRE can be found here: https://gist.github.com/konradmoesch/dacee6d8013438b9991a29df02ef7cdd

Thanks for your help!