# -*- coding: cp1252 -*-
# My encyclopedia.
# An interactive encyclopedia which shows
# pictures and information about them.
 
import Tkinter as tk
from PIL import ImageTk, Image
 
class Car(object):
    """this class creates a record structure"""
    def __init__(self, title, info, image):
        self.title = title
        self.info = info
        self.image = image
 
 
def main():
    global car_num
 
    car_num = 0
    create_widgets()
    root.mainloop()
 
def create_widgets():
    """ create text area and buttons"""
    global screen
    global info
 
    # text area for pictures
    screen = tk.Text(root, width=40, height=13, bg="Grey")
    screen.pack(side='top', expand='yes', fill='both')
    screen.insert(0.0, '\n\n\t Welcome to the Golfs history\n\n')
 
    # text area for information about pictures
    info = tk.Text(root, width=40, height=8, bg="White")
    info.pack(side='top', expand='yes', fill='both')
 
    # previous button
    prev = tk.Button(root, width=20, text="Previous", fg="Blue",
        command=previous)
    prev.pack(side='left')
 
    # next buttton
    nexst = tk.Button(root, width=20, text="Next", fg="Blue", 
        command=next)
    nexst.pack(side='left', fill='x')
 
    # quit button
    quit = tk.Button(root, width=20, text="Quit", fg="Blue",
        command=root.destroy)
    quit.pack(side='right', expand='yes')
 
def next():
    global car_num
    global car_list
 
    print car_num, len(car_list)
 
    show(car_num)
    # increment to next car number
    if car_num < len(car_list)- 1:
        car_num += 1
 
def previous():
    global car_num
 
    # decrement to previous car number
    if car_num > 0:
        car_num -= 1
    show(car_num)
 
def show(car_num):
    global car_list
    global screen
    global info    
 
    # delete any previous picture, title and info
    screen.delete(0.0, 'end')
    info.delete(0.0, 'end')
    # create picture heading
    s = car_list[car_num].title + '\n\n'
    screen.insert('1.0', s)
    # insert picture
    screen.image_create('2.0', image=car_list[car_num].image)
    # insert information about the picture
    info.insert('1.0', car_list[car_num].info)
 
 
root = tk.Tk()
root.title("Encyclopedia")
 
# create a list of car instances
car_list = []
 
# first car ...
title = "Golf Mk1 (A1/Typ 17, 1974-1984)"
info = """\
In May, 1974 Volkswagen presented the first-generation
Golf as a modern front wheel drive long-range replacement
of the Beetle.
"""
image = ImageTk.PhotoImage(file='Golf_Mk1.jpg')
# create the class instance and append to the list
car_list.append(Car(title, info, image))
 
# next car ...
title = "Golf Mk2 (A2/Typ 19E, 1985-1992)"
info = """\
Mk2 that slightly grew in terms of wheelbase, exterior
and interior dimensions while retaining in somewhat more
rounded form the Mk1's overall look. In 1985, the first
Golfs with four-wheel drive (Golf Country) went on sale.
"""
image = ImageTk.PhotoImage(file='Golf_Mk2.jpg')
# create the class instance and append to the list
car_list.append(Car(title, info, image))
 
# next car ...
title = "Golf Mk3 test"
info = """\
test
"""
image = ImageTk.PhotoImage(file='Golf_Mk3.jpg')
# create the class instance and append to the list
car_list.append(Car(title, info, image))
 
# and so on ...
 
 
main()