pango font need refresh

hi,

I'm playing with pango layout, I have now this verySimpleThing that
shows the line number aside of the textview area.

The problem appear when you scroll up or down the window, all the
numbers into the pango layout are unreadable.

I've tried also googling but with no luck.
Maybe someone already have fall into this issue?

Here is the code:

#!/usr/bin/env python

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

class MainWindow(gtk.Window):
    def __init__(self):
        gtk.Window.__init__(self)
        self.connect("delete_event", self.doQuit)
        self.set_default_size(300, 200)
        self.set_border_width(5)
        self.text = gtk.TextView()
        self.text.set_border_window_size(gtk.TEXT_WINDOW_LEFT, 30)
        buffer = self.text.get_buffer()
        self.text.connect('expose-event', self.expose)
        scrollWin = gtk.ScrolledWindow()
        scrollWin.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
        scrollWin.add(self.text)
        self.add(scrollWin)
        self.show_all()

    def expose(self, widget, event):
        text = widget
        left_win = text.get_window(gtk.TEXT_WINDOW_LEFT)
        type = gtk.TEXT_WINDOW_LEFT
        target = left_win
        first_y = event.area.y
        last_y = first_y + event.area.height
        x, first_y = text.window_to_buffer_coords(type, 0, first_y)
        x, last_y = text.window_to_buffer_coords(type, 0, last_y)
        numbers = []
        pixels = []
        count = self.get_lines(first_y, last_y, pixels, numbers)
        layout = widget.create_pango_layout("")
        
        layout.set_alignment(pango.ALIGN_RIGHT)
        layout.set_width(25 * pango.SCALE)
        attrList = pango.AttrList()
        atrribute = pango.AttrForeground(0, 0, 65535, 0, -1)
        attrList.insert(atrribute)
        layout.set_attributes(attrList)
  
        for i in range(count):
            x, pos = text.buffer_to_window_coords(type, 0, pixels[i])
            str = "%d" % numbers[i]
            layout.set_text(str)
            widget.style.paint_layout(target, widget.state, gtk.FALSE,
None, widget, None, 2, pos + 2, layout)

        return gtk.FALSE

    def get_lines(self, first_y, last_y, buffer_coords, numbers):
        text = self.text
        iter, top = text.get_line_at_y(first_y)
        count = 0
        size = 0
        while not iter.is_end():
            y, height = self.text.get_line_yrange(iter)
            buffer_coords.append(y)
            line_num = iter.get_line()
            numbers.append(line_num)
            count += 1
            if (y + height) >= last_y:
                break
            iter.forward_line()
        return count

    def doQuit(self, widget, data=None):
        gtk.main_quit()

    def main(self):
        gtk.main()

if __name__ == "__main__":
    go = MainWindow()
    go.main()


Thanks, regards
*L*

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