gtk_entry_currency.py

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import re
import locale

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


locale.setlocale(locale.LC_ALL, '')
frac_digits = locale.localeconv()['frac_digits']
mask = '%%0.%if' % frac_digits
divisor = 10 ** frac_digits


def string_to_real(entry):
    entry.handler_block_by_func(string_to_real)  # bloqueia o sinal da entry
    digits = re.sub('[^0-9]', '', entry.get_text())
    if digits:
        # entry.set_text(locale.format(mask, float(digits) / divisor, True))
        entry.set_text(locale.currency(float(digits) / divisor, True, True))
        GObject.idle_add(entry.set_position, -1)  # cursor no final do campo
    else:
        # entry.set_text(locale.format(mask, 0., True))
        entry.set_text(locale.currency(0., True, True))
        entry.set_position(-1)  # cursor no final do campo
    entry.handler_unblock_by_func(string_to_real)


if __name__ == '__main__':
    # classe apenas para testar a função
    class TestWindow(Gtk.Window):
        def __init__(self):
            val_entry = Gtk.Entry(margin=10, xalign=1)
            val_entry.connect('changed', string_to_real)
            val_entry.set_text('0')
            super(TestWindow, self).__init__()
            self.add(val_entry)
            self.connect('delete-event', Gtk.main_quit)
            self.show_all()

    TestWindow()
    Gtk.main()