Saul Spatz wrote:
> In tcl/tk an Entry widget can be set to validate its contents with the
> validate option. You have to give it a validatecommand (vcmd), which is a
> tcl script that runs when some action triggers validation. Usually, the
> script would use "percent substitutions" so the script would be something
> like {ValidInt %P} where %P is the value of the widget should the proposed
> change occur.
>
> Can one do something like this in tkinter? I've verified that with
>
> e = Entry(master, validate = 'all', vcmd = validInt)
>
> the validInt function is called, but it isn't passed any parameters. I
> can't find that e has any attribute corresponding to the %P value above.
>
> Is it not possible to do this in tkinter, or have I overlooked something?
Some time ago I came up with
http://mail.python.org/pipermail/python-list/2009-September/1220447.html
import Tkinter as tk
def validate(before, after):
print before, "-->", after
return after.isdigit()
if __name__ == "__main__":
root = tk.Tk()
name = root.register(validate)
cmd = 'expr {[%(name)s %(parms)s]}' % dict(name=name, parms="%s %P")
var = tk.StringVar()
entry = tk.Entry(root, textvariable=var,
validate="all", validatecommand=cmd)
entry.pack()
entry.focus_set()
root.mainloop()
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