# File: differences.py

# It's a Babbage all over again!

from Tkinter import *

master = Tk()

rows = 5
cols = 12
# For the big screen
# bigfont = "Helvetica 32"
bigfont = "Helvetica 24"

engine = [[0 for j in range(cols)] for i in range(rows)]
outputlab = [[-1 for j in range(cols)] for i in range(rows)]
inputbox = [0 for i in range(rows)]

# run the engine
def runEngine(event):
	for i in range(rows):
		if inputbox[i].get() == "":
			engine[i][0] = 0
		else:
			engine[i][0] = int(inputbox[i].get())
	for j in range(1,cols):
		for i in range(rows):
			if (i == rows-1):
				engine[i][j] = engine[i][j-1]
			else:
				engine[i][j] = engine[i][j-1] + engine[i+1][j-1] 
			outputlab[i][j].configure(text=engine[i][j])

# Start widgets
for i in range(rows):
	inputbox[i] = Entry(master, width=4, font=bigfont)
	inputbox[i].grid(row=i,column=0)
	inputbox[i].bind('<Return>',runEngine)
	for j in range(1,cols):
		outputlab[i][j] = Label(master, width=5, font=bigfont)
		outputlab[i][j].grid(row=i,column=j)

# Mark the first row.
inputbox[0].configure(bg="red")
for j in range(1,cols):
	outputlab[0][j].configure(bg="red")
for i in range(1,rows):
	inputbox[i].configure(bg="green")

# engine[0][0] = 1
# engine[1][0] = 2

# runengine()

master.mainloop()