'''
  Folding@Home Client Control (FAHControl)
  Copyright (C) 2010-2014 Stanford University

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
'''

import gtk
import re

class EntryValidator:
    def __init__(self, app, entry, pattern, description = ''):
        self.app = app
        self.entry = entry
        self.re = re.compile(pattern)
        self.description = description
        self.text = entry.get_text()

        entry.connect('focus-in-event', self.on_focus_in_event)
        entry.connect('focus-out-event', self.on_focus_out_event)


    def is_valid(self):
        return self.re.match(self.entry.get_text()) is not None


    def on_focus_in_event(self, widget, event, data = None):
        self.text = self.entry.get_text()
        return False # let the signal propagate


    def on_focus_out_event(self, widget, event, data = None):
        if not self.is_valid():
            self.app.error('Invalid value\n%s' % self.description)
            self.entry.set_text(self.text)

        else: self.text = self.entry.get_text()

        return False # let the signal propagate