Python GTK Drag and Drop - Get URL

Question

I'm creating a small app must be able to receive URLs. If the apps window is open, I should be able to drag a link from a browser and drop it into the app - and the app will save the URL to a database.

I'm creating this in Python/GTk. But I am a bit confused about the drag and drop functionality in it. So, how do it?

Some sample code to implement drag/drop(my app uses a bit of this code)...

import pygtk
pygtk.require('2.0')
import gtk

# function to print out the mime type of the drop item
def drop_cb(wid, context, x, y, time):
    l.set_text('\n'.join([str(t) for t in context.targets]))
    # What should I put here to get the URL of the link?

    context.finish(True, False, time)
    return True

# Create a GTK window and Label, and hook up
# drag n drop signal handlers to the window
w = gtk.Window()
w.set_size_request(200, 150)
w.drag_dest_set(0, [], 0)
w.connect('drag_drop', drop_cb)
w.connect('destroy', lambda w: gtk.main_quit())
l = gtk.Label()
w.add(l)
w.show_all()

# Start the program
gtk.main()

Answer 1

You must fetch the data yourself. Here's a simple working example that will set a label to the url dropped:

#!/usr/local/env python

import pygtk
pygtk.require('2.0')
import gtk

def motion_cb(wid, context, x, y, time):
    l.set_text('\n'.join([str(t) for t in context.targets]))
    context.drag_status(gtk.gdk.ACTION_COPY, time)
    # Returning True which means "I accept this data".
    return True

def drop_cb(wid, context, x, y, time):
    # Some data was dropped, get the data
    wid.drag_get_data(context, context.targets[-1], time)
    return True

def got_data_cb(wid, context, x, y, data, info, time):
    # Got data.
    l.set_text(data.get_text())
    context.finish(True, False, time)

w = gtk.Window()
w.set_size_request(200, 150)
w.drag_dest_set(0, [], 0)
w.connect('drag_motion', motion_cb)
w.connect('drag_drop', drop_cb)
w.connect('drag_data_received', got_data_cb)
w.connect('destroy', lambda w: gtk.main_quit())
l = gtk.Label()
w.add(l)
w.show_all()

gtk.main()

Answer 2

To be sure to get only the data of one file or directory on DnD'ing a list of files from your file explorer, you could use something like:

data.get_text().split(None,1)[0]

the code for the "got_data_cb" method would then look like this:

def got_data_cb(wid, context, x, y, data, info, time):
    # Got data.
    l.set_text(data.get_text().split(None,1)[0])
    context.finish(True, False, time)

This would split the data by any whitespace and returns you the first item.