class JournalButton(BaseButton):
    def __init__(self):
        BaseButton.__init__(self, mount_point='/')
        self.props.named_icon = 'activity-journal'

        client = gconf.client_get_default()
        color = XoColor(client.get_string('/desktop/sugar/user/color'))
        self.props.xo_color = color

        self._progress_bar = gtk.ProgressBar()
        vbox.add(self._progress_bar)
        self._progress_bar.show()

        self._free_space_label = gtk.Label()
        self._free_space_label.set_alignment(0.5, 0.5)
        vbox.add(self._free_space_label)
        self._free_space_label.show()

        self.connect('popup', self.__popup_cb)

    def __popup_cb(self, palette):
        mount_point = self._mount.get_root().get_path()
        stat = os.statvfs(mount_point)
        free_space = stat[statvfs.F_BSIZE] * stat[statvfs.F_BAVAIL]
        total_space = stat[statvfs.F_BSIZE] * stat[statvfs.F_BLOCKS]

        fraction = (total_space - free_space) / float(total_space)
        self._progress_bar.props.fraction = fraction
        self._free_space_label.props.label = _('%(free_space)d MB Free') % \
                {'free_space': free_space / (1024 * 1024)}