[Tkinter-discuss] Tkinter mouse-event w/o class and/or global?

[Cameron Laird]

On Mon, Jun 22, 2009 at 04:51:20AM -0700, GKalman wrote:
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> As an example:
> 
> I want to click on a Canvas and with that change its background color.
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> The "usual" way is to declare a class (i.e a namespace).
> 
> An other way is declare c=Canvas(...) as global.
> 
> Question:
> 
> Is it possible to do this without a class (OOP) or global variables? 
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Yes.

I *think* the following exemplifies what you seek:

    # Launch this application.  Notice the red canvas.  Click on it.
    import Tkinter

    def toggle_color(event):
        c = event.widget
        if c.cget("bg") == "red":
            new_color = "green"
        else:
            new_color = "red"
        c.configure(bg = new_color)

    root = Tkinter.Tk()
    my_canvas = Tkinter.Canvas(root, bg = "red")
    my_canvas.bind("<Button-1>", toggle_color)
    my_canvas.pack()
    root.mainloop()