#!/usr/bin/env python

import pygtk
import gtk

class custom(gtk.EventBox):
      def __init__(self):
      	  gtk.EventBox.__init__(self)
          self.fixed = gtk.Fixed()
          self.add(self.fixed)
          
          # connect to the motion notify event
	  self.connect("motion-notify-event", self.move)
	  self.set_events(gtk.gdk.ALL_EVENTS_MASK)

          # create a child object (an event box wrapped around an icon)
          cw = gtk.EventBox()
          ci = gtk.Image()
          ci.set_from_stock(gtk.STOCK_FILE, gtk.ICON_SIZE_DND)
          cw.add(ci)
          self.fixed.put(cw, 50, 50)

          #connect to the object's button events
          cw.connect("button-press-event", self.childpress)
          cw.connect("button-release-event", self.childrelease)

          # state variables
          self.moving = False
          self.moving_widget = None

      def move(self, widget, event):
          # if we're in moving state, set the widget's position to the
          # current mouse coordinates.
          # the problem here is that we seem to get two mouse coordinates
          # from the parent window that alternate between two different coordinate
          # spaces, causing the object to rapidly flash between two locations.
          if self.moving and self.moving_widget:
              assert event.window != self.window
              self.fixed.move(self.moving_widget, int(event.x) + self.moving_widget.allocation.x - self.delta[0],
                              int(event.y) + self.moving_widget.allocation.y - self.delta[1])
          return True

      def childpress(self, widget, event):
          # set the state to moving, and set the moving target
          self.moving = True
          self.moving_widget = widget
          self.delta = (int(event.x), int(event.y))

      def childrelease(self, widget, event):
          # set the state to not moving
          self.moving = False
          self.moving_widget = None

window = gtk.Window()
window.set_size_request(300,200)
evbox = custom()
window.add(evbox)
window.show_all()
gtk.main()