A newbie question about using tix
David Sumbler
david at aeolia.co.uk
Wed May 1 12:44:06 EDT 2019
On Tue, 2019-04-30 at 20:46 +0100, MRAB wrote:
> On 2019-04-30 16:40, David Sumbler wrote:
> > Running Ubuntu 18.04, Python 3.6.7, tkinter 8.6
> >
> > I am very new to tkinter. The simple program I am writing requires
> > a
> > user file to be selected before it does anything else, so I would
> > like
> > a file selection dialog in the main window as soon as the program
> > launches.
> >
> > Tkinter only has askopenfilename(), but this produces a popup
> > dialog.
> > I can get something like what I want by specifying a small Tk()
> > window
> > and then calling askopenfilename() so that it covers the root
> > window.
> >
> > It's not ideal, though. From the documentation I thought that the
> > tix
> > FileSelectBox would do what I wanted, but I just can't get it to
> > work.
> >
> > If I run:
> >
> > from tkinter import *
> > from tkinter.tix import FileSelectBox
> > root = Tk()
> > f = FileSelectBox(root)
> >
> > I get the following:
> >
> > Traceback (most recent call last):
> > File "/home/david/bin/Gradient.py", line 4, in <module>
> > f = FileSelectBox(root)
> > File "/usr/lib/python3.6/tkinter/tix.py", line 795, in
> > __init__
> > TixWidget.__init__(self, master, 'tixFileSelectBox',
> > ['options'], cnf, kw)
> > File "/usr/lib/python3.6/tkinter/tix.py", line 311, in
> > __init__
> > self.tk.call(widgetName, self._w, *extra)
> > _tkinter.TclError: invalid command name "tixFileSelectBox"
> >
> > I realize that assigning the value of FileSelectBox() isn't going
> > to
> > give me a filename: I'm just trying to get the basic syntax right
> > at
> > the moment.
> >
> > I can't figure out what is wrong though. Have I have misunderstood
> > how
> > it should be called, or is there something missing from my system?
> >
>
> For some reason, tix widgets don't work with normal tkinter widgets,
> so
> you can't put a tix FileSelectBox on a tkinter.Tk widget.
>
> There is, however, a tix.Tk widget that you can use instead:
>
> import tkinter.tix as tix
> root = tix.Tk()
> f = tix.FileSelectBox(root)
> f.pack()
Thanks for that.
When I ran the above, I got:
Traceback (most recent call last):
File "/home/david/bin/GradientProfile_v2.py", line 2, in <module>
root = tix.Tk()
File "/usr/lib/python3.6/tkinter/tix.py", line 214, in __init__
self.tk.eval('package require Tix')
_tkinter.TclError: can't find package Tix
After an internet search, I tried:
sudo apt install tix-dev tk-dev tk8.6-dev libxft-dev libfontconfig1-dev libfreetype6-dev libpng-dev
Now when I run the file the program just exits quickly, with no
reported errors, but no window(s). If I add 'root.mainloop()' at the
end, I get an empty root window for a fraction of a second, then the
program exits with:
Segmentation fault (core dumped)
Any suggestions as to where to go from here?
David
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