Drag and drop grid?

[MrGarbage]

Hi,

I am looking for the experts suggestions on how to best approach this
implementation. I have a custom LED widget. This will be arranged in
a grid as shown in the attached image. Using the left mouse click I
want to be able to grab the Green LED widget and drag it to one of the
other LED cells who would then turn Green.

It would be nice to have the LEDs use some sort of existing containerism
so that I can identify the drag destination without having to write too
much position calculation/object identification code.

Perhaps there is an applicable QT mechanism already in place?

Many thanks!

Mark