[Tkinter-discuss] Combining events?

[Bob Greschke]

On 2014-07-19, at 05:21, Michael Lange <klappnase at web.de> wrote:

> Hi,
> 
> On Fri, 18 Jul 2014 16:54:34 -0600
> Bob Greschke <bob at passcal.nmt.edu> wrote:
> 
>> I have a huge program...several huge programs...and I keep writing
>> duplicate sets of calls for <Return> and <KP_enter>.  I'm tired of it,
>> even though they are already all written.  Is there any way to combine
>> those (those two, specifically) into one bind like
>> 
>> x.bind(("<Return>", "<KP_Enter"), command = .....?
>> 
>> I know you can't do that, but something like that on a global scale
>> (both figuratively, and programmatically).  Some little line of code at
>> the beginning of the program that redirects the <KP_Enter> to the
>> <Return> event when some field or whatever is specifically looking for
>> either return key to be pressed?.
> 
> you could use event_generate() and bind_class(), as in this example:
> 
> from Tkinter import *
> root = Tk()
> 
> def on_kp_enter(event):
>    event.widget.event_generate('<Return>')
> root.bind_class('Button', '<KP_Enter>', on_kp_enter)
> 
> def on_return(event):
>    print('Return')
> 
> b = Button(root, text='Push me')
> b.pack()
> b.bind('<Return>', on_return)
> root.mainloop()
> 
> Regards
> 
> Michael
> 
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You are one smart guy!  This helps a lot.

I can tolerate doing

LEnt = Entry(stuff stuff stuff)
LEnt.bind("<Return>", "call call call")
LEnt.bind("<KP_Enter>", on_kp_enter)

I can't really do the bind_class, because not all fields respond to a Return/Enter.
What I'm trying to do is eliminate duplicating the "call call call" part like I have now.  Some/Most of the calls are kinda complex (a lot of argument passing to the handlers).  I'd seen that event_generate() a long time ago, but I never figured out how to use it from the Grayson Bible.  Now as I rescan that portion of the book I realize you may have made me dangerous. :)

Thanks!

Bob