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# testing a notebook widget class for Tkinter (modified)

import Tkinter as tk

class Notebook(object):
    """
    a notebook widget class for Tkinter applications
    """
    def __init__(self, parent):
        self.active_page = None
        self.count = 0
        self.selected = tk.IntVar(0)
        # orientation of initial tab (can go 'bottom' too)
        side = 'top'
        # new tabs go
        self.side= 'left'
        # create notebook's initial page frame
        self.tab = tk.Frame(parent)
        self.tab.pack(side=side, fill='both')
        self.page = tk.Frame(parent)
        self.page.pack(fill='both')

    def __call__(self):
        """
        parent page ref
        """
        return self.page

    def add_page(self, pg, title):
        """
        add a new page to the notebook
        """
        rb = tk.Radiobutton(self.tab, text=title, indicatoron=0, variable=self.selected,
            value=self.count, command=lambda: self.display_page(pg))
        rb.pack(fill='both', side=self.side)
        # first page is slected by default
        if not self.active_page:
            pg.pack(fill='both', expand=True)
            self.active_page = pg
        self.count += 1
        # returns reference
        return rb

    def display_page(self, pg):
        """
        shows selected page, hides former page
        """
        self.active_page.forget()
        pg.pack(fill='both', expand=True)
        self.active_page = pg


# testing the module
if __name__ == '__main__':
    root = tk.Tk()
    root.title('Testing a Tkinter notebook widget')

    nb = Notebook(root)

    # create first page (notice the call)
    page1 = tk.Frame(nb())
    nb.add_page(page1, 'page 1')
    # put something on the page
    # text entry field, width=width in chars, height=lines text
    text1 = tk.Text(page1, width=60, height=12, bg='yellow')
    text1.pack()
    text1.insert(tk.INSERT, ' this is page number 1')

    # create second page
    page2 = tk.Frame(nb())
    nb.add_page(page2, 'page 2')
    # put something on the page
    text2 = tk.Text(page2, width=60, height=12, bg='green')
    text2.pack()
    text2.insert(tk.INSERT, ' this is page number 2 \n Look, I am green!')
    button2 = tk.Button(page2, text='save text to file')  # just a dummy for testing
    button2.pack(side='left')
   
    root.mainloop()