# MCS 260 Review 2 Mon 12 Nov 2007 : guipin.py
#
# We use four scales to enter a PIN number.

from Tkinter import *

class GuiPin():
   """
   Four scales to enter a 4-digit number.
   """
   def __init__(self,wdw):
      "defines layout of the GUI"
      wdw.title('PIN slider')
      self.d0 = IntVar()
      self.d1 = IntVar()
      self.d2 = IntVar()
      self.d3 = IntVar()
      self.s0 = Scale(wdw,\
         orient='vertical',\
         from_=0,to=9,resolution=1,\
         variable=self.d0,command=self.ShowPin)
      self.s1 = Scale(wdw,\
         orient='vertical',\
         from_=0,to=9,resolution=1,\
         variable=self.d1,command=self.ShowPin)
      self.s2 = Scale(wdw,\
         orient='vertical',\
         from_=0,to=9,resolution=1,\
         variable=self.d2,command=self.ShowPin)
      self.s3 = Scale(wdw,\
         orient='vertical',\
         from_=0,to=9,resolution=1,\
         variable=self.d3,command=self.ShowPin)
      self.s3.grid(row=0,column=0)
      self.s2.grid(row=0,column=1)
      self.s1.grid(row=0,column=2)
      self.s0.grid(row=0,column=3)
      self.e = Entry(wdw)
      self.e.grid(row=1,columnspan=4,sticky=W+E)

   def ShowPin(self,v):
      "puts the PIN in the entry widget"
      n0 = self.d0.get()
      n1 = self.d1.get()
      n2 = self.d2.get()
      n3 = self.d3.get()
      n = n0 + 10*(n1 + 10*(n2 + 10*n3)) 
      sn = '%04d' % n
      self.e.delete(0,END)
      self.e.insert(INSERT,sn)

def main():
   top = Tk()
   show = GuiPin(top)
   top.mainloop()

if __name__ == "__main__": main()