Mine

#!/usr/bin/python# vim: set expandtab tabstop=4 shiftwidth=4:import gtkimport mathimport timeimport cairoimport gobjectclass ClickDrag(object):    def __init__(self, winsize, areasize):        self.areasize = areasize        window = gtk.Window()        window.set_title('Testing Click-and-Drag')        window.set_size_request(winsize, winsize)        vbox = gtk.VBox()        window.add(vbox)        label = gtk.Label('Click and drag, yo.')        label.set_padding(0, 10)        vbox.pack_start(label, False, False)        scroll = gtk.ScrolledWindow()        vbox.add(scroll)        vport = gtk.Viewport()        scroll.add(vport)        self.hadj = scroll.get_hadjustment()        self.vadj = scroll.get_vadjustment()        self.area = gtk.DrawingArea()        vport.add(self.area)        self.area.set_size_request(self.areasize, self.areasize)        self.area.set_events(gtk.gdk.POINTER_MOTION_MASK |                 gtk.gdk.BUTTON_PRESS_MASK |                 gtk.gdk.BUTTON_RELEASE_MASK)        self.area.connect('realize', self.draw)        window.connect('delete-event', gtk.main_quit)        self.dragging = False        self.window = window    def draw(self, widget=None):        # Pixmap for the DrawingArea        self.pixmap = gtk.gdk.Pixmap(self.area.window, self.areasize, self.areasize)        ctx = self.pixmap.cairo_create()        ctx.set_source_rgba(0, 0, 0, 1)        ctx.paint()        # Populate with a gradient        center = self.areasize/2        grad = cairo.RadialGradient(center, center, 0,                center, center, math.sqrt((center**2)*2))        grad.add_color_stop_rgb(0, 0, 0, 0)        grad.add_color_stop_rgb(.25, 1, 0, 0)        grad.add_color_stop_rgb(.50, 0, 1, 0)        grad.add_color_stop_rgb(.75, 0, 0, 1)        grad.add_color_stop_rgb(1, 1, 1, 1)        ctx.set_source(grad)        ctx.paint()        # Now initialize        self.style = self.area.get_style().fg_gc[gtk.STATE_NORMAL]        self.area.connect('expose-event', self.on_expose)        self.area.connect('button-press-event', self.on_button_press)        self.area.connect('button-release-event', self.on_button_release)        self.area.connect('motion-notify-event', self.on_motion_notify)        self.area.window.set_cursor(gtk.gdk.Cursor(gtk.gdk.FLEUR))        self.on_expose()        print 'Horizontal upper: %d' % (self.hadj.get_upper())        print 'Vertical upper: %d' % (self.vadj.get_upper())        # Clean up        return False    def on_expose(self, widget=None, event=None):        self.area.window.draw_drawable(self.style, self.pixmap, 0, 0, 0, 0, self.areasize, self.areasize)    def on_button_press(self, widget, event):        self.dragging = True        self.hold_x = event.x_root        self.hold_y = event.y_root        self.area.window.set_cursor(gtk.gdk.Cursor(gtk.gdk.DOT))    def on_button_release(self, widget, event):        self.dragging = False        self.area.window.set_cursor(gtk.gdk.Cursor(gtk.gdk.FLEUR))    def on_motion_notify(self, widget, event):        if self.dragging:            diff_x = self.hold_x - event.x_root            diff_y = self.hold_y - event.y_root            if diff_x != 0:                newval = self.hadj.get_value() + diff_x                if newval  < self.hadj.lower:                    newval = self.hadj.lower                elif newval > self.hadj.upper-self.hadj.page_size:                    newval = self.hadj.upper-self.hadj.page_size                self.hadj.set_value(newval)            if diff_y != 0:                newval = self.vadj.get_value() + diff_y                if newval  < self.vadj.lower:                    newval = self.vadj.lower                elif newval > self.vadj.upper-self.vadj.page_size:                    newval = self.vadj.upper-self.vadj.page_size                self.vadj.set_value(newval)            self.hold_x = event.x_root            self.hold_y = event.y_root    def run(self):        self.window.show_all()        gtk.main()if __name__ == '__main__':    foo = ClickDrag(700, 3000)    foo.run()