Here is how to achieve drag and drop functionality in GTK in python. Recently I needed this for my project and it took me some time to find how to do that, so now I'm sharing it in case anyone needs it.
Drag source implementation:
button = Gtk.Button(label="Drag File")
drag = Gtk.DragSource.new()
Here is how I rooted my Motorola Edge 40 (can be applied on other Motorlola phones). Sharing because I had hard time finding good rooting guide. Hope you find this usefull.
Do at your own risk and only if you know what are you doing.
NOTE: i got fastboot working after couple of tries, here is the process i expect to work