[Tkinter-discuss] creating widgets generically, with a loop?

[Mike Steiner]

It works!

Thanks for your help. I've included the complete (it's small) source
file below, in case anyone's curious.

----- start of .py file -----

import os
from Tkinter import *

class App:
    def __init__( self , top ):
        top.geometry ( "+0+0" )

        my_buttons = [ ( "button_text1" , "program_name1" ,
"file_name1" , 1 , 0 ) , ( "button_text2" , "program_name2" ,
"file_name2" , 0 , 1 ) ]

        for text , external , filename , row , col in my_buttons:
            b = Button( top , font=("Verdana",7) , pady=0 ,
borderwidth=0 , text=text , command=self.launchit(external,filename)
)
            b.grid( sticky="w" , row=row , column=col )

    ## this function is called when you create the Button widget
    def launchit ( self , external , filename ):
        external_short = os.path.split( external )[1]

        ## this inner function has access to the outer functions 	
        ## namespace
        def real_launchit ( ):
            os.spawnl ( os.P_NOWAIT , external , external_short ,
filename )

        ## return a reference to the inner function
        ## this 'reference to a function' will be called when the
button
        ## is pressed
        return real_launchit

root = Tk()
app = App(root)
root.mainloop()
----- end of .py file -----


--- Martin Franklin <mfranklin1 at gatwick.westerngeco.slb.com> wrote:

> Mike Steiner wrote:
> > Does this work - does the "command=" parameter allow the function
> > value to contain parameters too? If so, it would solve the
> problem
> > easily!
> > 
> > --- Martin Franklin <mfranklin1 at gatwick.westerngeco.slb.com>
> wrote:
> >> [ stuff omitted ]
> >> for text, external, filename in my_buttons:
> >>    b = Button(self, text=text, command=self.launchit(external,
> >> filename))
> >>    b.grid()
> > 
> 
> 
> Mike,
> 
> 
> Sorry I should have provided some doc strings ;)  The magic in my
> example is here:-
> 
> ## this function is called when you create the Button widget
> def launchit(external, filename):
>     external_short = os.path.split()[1]
> 
>     ## this inner function has access to the outer functions 	
>     ## namespace
>     def real_launchit():
>         os.spawnl(os.P_NOWAIT, external, external_short, filename)
> 
>     ## return a reference to the inner function
>     ## this 'reference to a function' will be called when the
> button
>     ## is pressed
>     return real_launchit
> 
> 
> on re-reading the example I noticed I had made a couple of typoes
> 
> Cheers
> Martin
> 
> 
> 
> _______________________________________________
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> 


Michael Steiner
MikeJaySteiner at yahoo.com

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