Using this Python script, which is my first attempt to find out how ttk.Treeview works (an extra copy of autoscrolling is just breaking horizontal and vertical callbacks):
import Tkinter as tk import ttk class Test(): def __init__(self, parent=None): self.win = tk.Toplevel() self.win.grid_columnconfigure(0, weight=1) self.win.grid_rowconfigure(0, weight=1) self.treeFrame = ttk.LabelFrame(self.win, text='Test Scrolling tk.Treeview') self.treeFrame.grid(row=0, column=0, padx=5, pady=5, sticky='nsew') self.treeFrame.grid_columnconfigure(0, weight=1) self.treeFrame.rowconfigure(0, weight=1) def autoscrollv(sbar, first, last): print 'vert first:%s, last:%s' % (first,last) first, last = float(first), float(last) if first <= 0 and last >= 1: sbar.grid_remove() else: sbar.grid() sbar.set(first, last) def autoscrollh(sbar, first, last): print 'horz first:%s, last:%s' % (first,last) first, last = float(first), float(last) if first <= 0 and last >= 1: sbar.grid_remove() else: sbar.grid() sbar.set(first, last) vsb = ttk.Scrollbar(self.treeFrame, orient="vertical") hsb = ttk.Scrollbar(self.treeFrame, orient="horizontal") self.tree = ttk.Treeview(self.treeFrame, height=10, yscrollcommand=lambda f, l: autoscrollv(vsb, f, l), xscrollcommand=lambda f, l: autoscrollh(hsb, f, l)) self.tree.column("#0", minwidth=400, stretch=True) vsb['command'] = self.tree.yview hsb['command'] = self.tree.xview self.tree.grid(row=0, column=0, sticky='nsew') vsb.grid(column=1, row=0, sticky='ns') hsb.grid(column=0, row=1, sticky='ew') self.tree.insert('', 'end', 'xyz', text='abc'*20) for i in range(30): self.tree.insert('xyz', 'end', text='%s' % i + 'xyz'*40) self.win.mainloop() if __name__ == "__main__": test = Test()
I see the following behavior: the first time the program starts, the output looks like this: 
.
If I expand the window until the horizontal scrollbar turns off, it will look like this: 
If I continue to expand the window, here is the whole text: 
My first question is: how can I get xscrollcommand to recognize the actual width of the text, and not use the value for minwidth?
Returning to the state in the second image, if I open the element, it will go to the following: 
My second question is almost the same as the first. How can I recognize the new width of an element after it is opened?
If you change minwidth = 400 to width = 400, the horizontal scrollbar will never appear.
Summary: while the vertical scrollbar works as I would expect, and reacting to the actual lines of the displayed text (and not the ttk.Treeview setting for height), the horizontal scrollbar seems to take care of the minwidth value. I thought to use something like below, especially if there is an equivalent for ttk themed widgets. But the minwidth setting does not take effect after filling the tree, although I can change the width value at this point. Is there a way to force change the minwidth?
minwidth=tkFont.Font().measure(text) self.tree.column('#0', minwidth=tcw)
Sorry for the extra window; this part of Tkinter doesn't scare me ...