Creating the context/pop-up menu

Let's complete the editor in this final iteration by adding a contextual menu to the editor (refer to 2.12.py in the code bundle), as shown in the following screenshot:

The menu that pops up on the right-mouse-button click at the location of the mouse cursor is called the context menu or the pop-up menu.

Let's code this feature in the text editor. First define the context menu, as follows:

popup_menu = Menu(content_text)
for i in ('cut', 'copy', 'paste', 'undo', 'redo'):
    cmd = eval(i)
    popup_menu.add_command(label=i, compound='left', command=cmd)
popup_menu.add_separator()
popup_menu.add_command(label='Select All', underline=7, command=select_all)

Then, bind the right-click of a mouse with a callback named show_popup_menu, as follows:

content_text.bind('<Button-3>', show_popup_menu)

Finally, define the show_popup_menu function in the following way:

def show_popup_menu(event):
    popup_menu.tk_popup(event.x_root, event.y_root)

You can now right-click...