# Import the widgets library
from libopensesame import widgets
from random import shuffle
# Create a form
form = widgets.form(self.experiment, cols=[1,1,1,1], rows=[4,1,1],
        margins=(50,100,50,100), spacing=10)

# Create five widgets
image = widgets.image(form, path=self.experiment.get_file(self.get('facestims')))
e_happy = widgets.button(form, text='Happy', var = 'e_happy')
e_sad = widgets.button(form, text='Sad', var = 'e_sad')
e_angry = widgets.button(form, text='Angry', var = 'e_angry')
e_fearful = widgets.button(form, text='Fearful', var = 'e_fearful')
# Creat a list with 4 random numbers from 0:3
#Add the widgets to the form. The position in the form is indicated as a
# (column, row) tuple.

i=range(4)
shuffle(i)
form.set_widget(image, (0,0),colspan=4, rowspan=2)
form.set_widget(e_happy, (i.pop(),2))
form.set_widget(e_sad, (i.pop(),2))
form.set_widget(e_angry, (i.pop(),2))
form.set_widget(e_fearful, (i.pop(),2))
# Execute the form! In this case, the form will return the text of the button that
# was clicked. This is one way to get a return value out of the form. Another way
# is to use the 'var' keyword, supported some of the widgets.
starting_time = self.time()

button_clicked = form._exec()

# Determine the current time:
current_time = self.time()

# The time it took to complete the form base is the
# difference score between the two:
sub_rt = current_time - starting_time

# Set the new variable for future use in the
# GUI (notably, the logger item):
exp.set("sub_rt", sub_rt)