[EMAIL PROTECTED] wrote:
> I've created a short test program that uses tkFileDialog.askdirectory
> to help the user input a path into a tk entry widget. The problem I'm
> having is that when I run the code as listed below, the getPath
> function is called when the program initially runs, not when the button
> is pressed.
>
> from Tkinter import *
> import tkFileDialog
>
> class App:
>
> def __init__(self, master):
>
> frame = Frame(master)
> frame.pack()
>
> t = StringVar()
> self.entry = Entry(frame, textvariable=t)
> self.entry.pack(side=LEFT)
>
> self.button = Button(frame, text="Select", fg="red")
> self.button["command"] = self.getPath(t)
> self.button.pack(side=LEFT)
>
> def getPath(self, t):
> dirPath = tkFileDialog.askdirectory(initialdir="c:\\")
> print dirPath
> t.set(dirPath)
>
> root = Tk()
> app = App(root)
> root.mainloop()
>
>
> The problem arises when I try to pass the t variable in the "command"
> option of the button widget. If I set the command to
> "command=self.getpath" rather than "command=self.getpath(t)", then I
> don't get this issue. But I would like to be able to pass a variable
> to the the function through the command option. I'm a Tk newbie ....
> what am I doing wrong?
>
Well, in python 2.5, you might consider functools.partial.
Other options, including lambda, will be suggested and are the
traditional way to do this sort of thing.
Here is the revised code:
import functools
from Tkinter import *
import tkFileDialog
class App:
def __init__(self, master):
frame = Frame(master)
frame.pack()
t = StringVar()
self.entry = Entry(frame, textvariable=t)
self.entry.pack(side=LEFT)
self.button = Button(frame, text="Select", fg="red")
# note change here
self.button["command"] = functools.partial(self.getPath, t)
self.button.pack(side=LEFT)
def getPath(self, t):
dirPath = tkFileDialog.askdirectory(initialdir="c:\\")
print dirPath
t.set(dirPath)
root = Tk()
app = App(root)
root.mainloop()
--
James Stroud
UCLA-DOE Institute for Genomics and Proteomics
Box 951570
Los Angeles, CA 90095
http://www.jamesstroud.com/
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