def my_form_validator():

	"""Checks whether both the gender and age fields have been filled out"""

	return var.gender != u'no' and var.lat != u'no' and var.lettresNP != u'' and var.age != u''


def filter_digits(ch):

	"""Allows only digit characters as input"""

	return ch in u'0123456789'



def filter_lettres(ch):

	return ch in u'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZzÀàÂâÆæÇçÉéÈèÊêËëÎîÏïÔôŒœÙùÛûÜüŸÿ'
	
# Define all widgets
button_next = Button(text=u'Suivant')
label_gender= Label(u'Votre genre')
checkbox_male = Checkbox(text=u'Masculin', group=u'gender', var=u'gender')
checkbox_female = Checkbox(text=u'Féminin', group=u'gender', var=u'gender')
checkbox_other = Checkbox(text=u'Autre', group=u'gender', var=u'gender')

label_lat= Label(u'Latéralité')
checkbox_droit = Checkbox(text=u'Droitier(e)', group=u'lat', var=u'lat')
checkbox_gauch = Checkbox(text=u'Gaucher(e)', group=u'lat', var=u'lat')
checkbox_ambi = Checkbox(text=u'Ambidextre', group=u'lat', var=u'lat')

#label_age = Label(u'Votre âge')
# Specify a key filter so that only digits are accepted as text input
input_age = TextInput(stub=u'Âge …', var=u'age', key_filter=filter_digits)
label_infos = Label(u'<b>Quelques informations</b>')
label_lettresNP = Label(u'Mentionnez les deux premières lettres de votre nom et de votre prénom', center=False)
input_lettresNP = TextInput(stub=u'…', var=u'lettresNP', key_filter=filter_lettres)
# Build the form. Specify a validator function to make sure that the form is
# completed.
my_form = Form(validator=my_form_validator, rows=[1,1,1,1,1,1], cols=[1,1,1,1,1,1,1], margins=(50,50,50,50), spacing=25)

my_form.set_widget(label_infos, (0, 0), colspan=7)
my_form.set_widget(label_lettresNP, (0, 1), colspan=6)
my_form.set_widget(input_lettresNP, (6, 1))
my_form.set_widget(label_gender, (0, 2))
my_form.set_widget(checkbox_male, (1, 2), colspan=2)
my_form.set_widget(checkbox_female, (3, 2), colspan=2)
my_form.set_widget(checkbox_other, (5, 2), colspan=2)

my_form.set_widget(label_lat, (0, 3))
my_form.set_widget(checkbox_droit, (1, 3), colspan=2)
my_form.set_widget(checkbox_gauch, (3, 3), colspan=2)
my_form.set_widget(checkbox_ambi, (5, 3), colspan=2)

#my_form.set_widget(label_age, (0, 4))
my_form.set_widget(input_age, (0, 4), colspan=7)
my_form.set_widget(button_next, (0, 5), colspan=7)
my_form._exec()