# file: notebook.py
# A simple notebook-like Tkinter widget.
# Copyright 2003, Iuri Wickert (iwickert yahoo.com)

from Tkinter import *

class notebook:
	
	
	# initialization. receives the master widget
	# reference and the notebook orientation
	def __init__(self, master, side=LEFT):
		
		self.active_fr = None
		self.count = 0
		self.choice = IntVar(0)

		# allows the TOP and BOTTOM
		# radiobuttons' positioning.
		if side in (TOP, BOTTOM):
			self.side = LEFT
		else:
			self.side = TOP

		# creates notebook's frames structure
		self.rb_fr = Frame(master, borderwidth=2, relief=RIDGE)
		self.rb_fr.pack(side=side, fill=BOTH)
		self.screen_fr = Frame(master, borderwidth=2, relief=RIDGE)
		self.screen_fr.pack(fill=BOTH)
		

	# return a master frame reference for the external frames (screens)
	def __call__(self):

		return self.screen_fr

		
	# add a new frame (screen) to the (bottom/left of the) notebook
	def add_screen(self, fr, title):
		
		b = Radiobutton(self.rb_fr, text=title, indicatoron=0, \
			variable=self.choice, value=self.count, \
			command=lambda: self.display(fr))
		b.pack(fill=BOTH, side=self.side)
		
		# ensures the first frame will be
		# the first selected/enabled
		if not self.active_fr:
			fr.pack(fill=BOTH, expand=1)
			self.active_fr = fr

		self.count += 1
		
		# returns a reference to the newly created
                # radiobutton (allowing its configuration/destruction)         
                return b


	# hides the former active frame and shows 
	# another one, keeping its reference
	def display(self, fr):
		
		self.active_fr.forget()
		fr.pack(fill=BOTH, expand=1)
		self.active_fr = fr

# END


###-------------------------------
# file: test.py
# simple demonstration of the Tkinter notebook

from Tkinter import *
from notebook import *

a = Tk()
n = notebook(a, LEFT)

# uses the notebook's frame
f1 = Frame(n())
b1 = Button(f1, text="Button 1")
e1 = Entry(f1)
# pack your widgets before adding the frame 
# to the notebook (but not the frame itself)!
b1.pack(fill=BOTH, expand=1)
e1.pack(fill=BOTH, expand=1)

f2 = Frame(n())
# this button destroys the 1st screen radiobutton
b2 = Button(f2, text='Button 2', command=lambda:x1.destroy())
b3 = Button(f2, text='Beep 2', command=lambda:Tk.bell(a))
b2.pack(fill=BOTH, expand=1)
b3.pack(fill=BOTH, expand=1)

f3 = Frame(n())

# keeps the reference to the radiobutton (optional)
x1 = n.add_screen(f1, "Screen 1")
n.add_screen(f2, "Screen 2")
n.add_screen(f3, "dummy")

if __name__ == "__main__":
        a.mainloop()

# END