Python tkinter treeview column sizes

Question

I have a Treeview in tkinter (Python 3.6 on Linux, but the same happens on windows) which I'm using to emulate a sort of spread-sheet layout. My problem is that, if I run the example code, below, and resize say "Column 1" then as "Column 1" gets bigger, "Column 2" gets smaller. However, if I drag out the final column to the right, the scroll bar expands, and now I can resize column 1 without changing the size of column 2 (instead the whole tree view expands). If you then resize, say, column 1 again, until all columns fit in the view, the behaviour seems to revert to the original.

What causes this change of behaviour? Both, how can I stop it, and how can I ensure it's the default?

Minimal working example:

import tkinter as tk
import tkinter.ttk as ttk

root = tk.Tk()
root.columnconfigure(0, weight=1)
root.rowconfigure(0, weight=1)

tree = ttk.Treeview(root)
tree["show"] = "headings"
tree["columns"] = list(range(3))
for i in range(3):
    tree.heading(i, text="Column {}".format(i))

for i in range(5):
    tree.insert('', "end", i)

tree.grid(row=0, column=0, sticky=(tk.N, tk.S, tk.E, tk.W))
xs = ttk.Scrollbar(root, orient=tk.HORIZONTAL, command=tree.xview)
tree["xscrollcommand"] = xs.set
xs.grid(row=1, column=0, sticky=(tk.E, tk.W))

root.mainloop()

Brown · Accepted Answer · 2017-10-24 15:28:27Z

8

The best control you have in a Treeview is using the stretch attribute of columns. If you make all of your columns' stretch and minwidth attributes.

for i in range(3):
    tree.column('#' + str(i), minwidth=300, stretch=0)
    tree.heading(i, text="Column {}".format(i))
tree.column('#0', stretch=0)

edited Oct 24, 2017 at 15:28

Brown

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answered Jun 2, 2017 at 16:48

Ron Norris

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1 Comment

Matthew Daws Over a year ago

Thanks! So stretch=False works well for me: it forces the widget into the "2nd mode" I discussed in the OP. Official docs: docs.python.org/3/library/tkinter.ttk.html#tkinter.ttk.Treeview Still leaves it slightly unclear why, by default, the widget sometimes resizes the columns. But such is life...

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