Re: 'connect' widget classes in an application

Extended the code with a ttk.notebook and a button. Seems to work. Text 
is added only at the last opened tab, by the button, I think I 
understand why but will look into that later.

When I add a tab through the button, no event is generated. When adding 
through a double-click or ctrl-n it does. Where does this difference 
come from?

Ingo



import tkinter as tk
from tkinter import ttk

class Ttoolbar(ttk.Frame):

      def __init__(self, parent=None):
          ttk.Frame.__init__(self, parent)
          self._tb_items = []

      def add_button(self, **kw):
          b = ttk.Button(self, **kw)
          b.pack(side=tk.LEFT)
          self._tb_items.append(b)


class Eedit(tk.Text):

     def __init__(self, parent=None):
         txt = tk.Text.__init__(self, parent)


class Nnotebook(ttk.Notebook):

     def __init__(self, parent=None):
         ttk.Notebook.__init__(self, parent)
         self.pack(fill=tk.BOTH, expand=tk.Y)
         self.config(width=400, height=400)
         self.bind_class("TNotebook", "<Double-ButtonPress-1>", 
self.add_edtab)
         self.bind_all("<Control-n>", self.add_edtab)

     def add_edtab(self, event=None):
         if event:
               print(event)
         self.ed = Eedit()
         self.add(self.ed, text="test")


class Aapp(ttk.Frame):

      def __init__(self, parent=None):
          ttk.Frame.__init__(self, parent)

          self.tb = Ttoolbar()
          self.tb.pack(side=tk.TOP, fill=tk.X)
          self.nb = Nnotebook()
          self.nb.pack()

          self.tb.add_button(
               text='Add Tab',
               command=lambda: self.nb.add_edtab()
          )
          self.tb.add_button(
               text='Add Text',
               command=lambda: self.nb.ed.insert(tk.END, 'Button 
pressed.\n')
          )


if __name__ == '__main__':
      app = Aapp()
      app.pack()
      app.mainloop()