I am trying to make a custom UI that will display on top of the viewport (see attached).
I made a Toolbar Button plugin to start with. The idea being once the plugin button is clicked, it shows the redbox on top of the viewport.
After that’s done, I wanna further modify that redbox so that I can pan around the box and the editor viewport will pan accordingly (such as moving the timeline in video editing tool).
So I was wondering if I were to do this, which part of the UE doc should I begin with?
Any help is appreciated. Thanks in advance.