'''
20210923
R. Dawes

New features added in this version:
  I got tired of squinting to read the tiny letters and numbers in the
  previous versions, so I  now increase the font size to 20
'''

import tkinter as tk
from tkinter import font         # gives access to the font control
import sys


window = tk.Tk()
window.title("Compare two numbers")
window.geometry("1200x800")

# reset the default font size
window.defaultFont = font.nametofont("TkDefaultFont")
# the "window" object does not initially have a specified font, so we 
# give it one, using the standard font that tkinter uses.  Now that "window"
# has a font we can modify it
window.defaultFont.configure(size=20)
# This changes the font size for all Labels and Buttons.  We will need to handle
# Entry and Text widgets when we create them.


label_1 = tk.Label(window,text="Enter x in this box  ")

#add an entry box to accept input
entry_1 = tk.Entry(window, width = 10, font=(None,20))
# The "font=(None,20)" argument means "Don't change the font, but change
# the size to 20".  If we wanted to use a special font we would put the name
# of the font in place of "None"

label_2 = tk.Label(window,text="Enter y in this box  ")
#add an entry box to accept input
entry_2 = tk.Entry(window, width = 10, font=(None,20))


#add a text box to show output
text_1 = tk.Text(window,height = 10, width = 30, font=(None,20))

#add a button - a clickable object

#add a function to react to button_1

def button_1_clicked():
   try:
      x = float(entry_1.get())
   except ValueError:
      x = None
   try:
      y = float(entry_2.get())
   except ValueError:
      y = None     
      
   text_1.delete(1.0, tk.END)
   if (x == None) or (y == None):
      text_1.insert(tk.END, "Invalid Input")
   else:
      
      if (x < y):
         text_1.insert(tk.END, str(x) + " < " + str(y))
      elif (x > y):
         text_1.insert(tk.END, str(x) + " > " + str(y))
      else:
         text_1.insert(tk.END, str(x) + " = " + str(y))


button_1 = tk.Button(window, text = "Compare Them", command = button_1_clicked)

#add a button to end execution

button_2 = tk.Button(window,text = "Exit", command = sys.exit)


label_1.grid(row = 0, column = 0)
entry_1.grid(row = 0, column = 1)
label_2.grid(row = 1, column = 0)
entry_2.grid(row = 1, column = 1)
button_1.grid(row = 2, column = 0)
text_1.grid(row = 2, column = 2)
button_2.grid(row = 7, column = 7)

window.mainloop()