Fwiw I've had a crack at this today. I did have some limited success in implementing the "Connect" callback, but couldn't seem to wire everything up completely. I don't think it will be too bad - given a lot of the boilerplate is already there. However, I was basically hacking away at stuff by spawning a function to "RunOnGlibThread" on the MainWindow, and trying to stuff it all in there as a PoC... and it all just felt incredibly dirty and hacky, and I figure it is best to leave it to those who actually know what they're doing.

It would be really nice to get this sorted though, so we have all 3 platforms working with drag and drop. I've attached a really simple python script which I was using on KDE/Wayland with success to demo the APIs in use. There's no way I'd be able to take it further than this though, as I just don't have the skillset to sort it, sorry.

#!/usr/bin/env python3

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk, Gdk, GObject

class DragDropWindow(Gtk.Window):

    def __init__(self):

        Gtk.Window.__init__(self, title='Drag and drop test')
        self.set_default_size(400, 400)

        # Set up drag and drop
#       self.connect("drag-motion", self.motion_cb)
#       self.connect("drag-drop", self.drop_cb)
        self.connect("drag-data-received", self.got_data_cb)
#       self.drag_dest_set(0, [], 0)
        targets = Gtk.TargetList.new([])
        targets.add_uri_targets(2)
        self.drag_dest_set_target_list(targets)
        self.drag_dest_add_text_targets()
        
#      { "STRING",        0, TARGET_STRING },
#      { "text/plain",    0, TARGET_STRING },
#      { "text/uri-list", 0, TARGET_URL },

#    def motion_cb(self, wid, context, x, y, time):
#        Gdk.drag_status(context,Gdk.DragAction.COPY, time)
#        return True

#    def drop_cb(self, wid, context, x, y, time):
#        wid.drag_get_data(context, context.list_targets()[-1], time)

    def got_data_cb(self, wid, context, x, y, data, info, time):

        print("got cb")

        if info == 0:
            text = data.get_text()
            datatype = data.get_target()
            print("Received text: %s" % text)
            print("Data type:     %s" % datatype)

        elif info == 2:
            print("Path/s %s" % data.get_uris())
            print("Size %s" % data.get_length())
            print("datatype/mime %s" % data.get_target())

        context.finish(True, False, time)

win = DragDropWindow()
win.connect("destroy", Gtk.main_quit)
win.show_all()
Gtk.main()

Uh oh!

[Known][Waiting] Drag and Drop files doesn't work on Linux #6085

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