Horizontal scrolling won't activate for ttk Treeview widget

Question

I\'m using the ttk Treeview widget to implement a folder/path selection dialog. It\'s all working as expected except that my horizontal scrollbar won\'t activate. No matte

Answer 1

import tkinter as tk
import tkinter.ttk as ttk
import tkinter.font as tk_font

class TreeListBox:

    def __init__(self, master, root, dict_group):
        self.master = master
        self.root = root
        self.dict_group = dict_group
        self.level = 0
        self.setup_widget_tree()
        self.build_tree(self.root, '')

    def setup_widget_tree(self):
        container_tree = tk.Frame(self.master, width=250, height=300)
        container_tree.propagate(False)
        container_tree.pack(side="left", fill='y')
        self.tree = ttk.Treeview(container_tree, show="tree", selectmode='browse')
        fr_y = tk.Frame(container_tree)
        fr_y.pack(side='right', fill='y')
        tk.Label(fr_y, borderwidth=1, relief='raised', font="Arial 8").pack(side='bottom', fill='x')
        sb_y = tk.Scrollbar(fr_y, orient="vertical", command=self.tree.yview)
        sb_y.pack(expand='yes', fill='y')
        fr_x = tk.Frame(container_tree)
        fr_x.pack(side='bottom', fill='x')
        sb_x = tk.Scrollbar(fr_x, orient="horizontal", command=self.tree.xview)
        sb_x.pack(expand='yes', fill='x')
        self.tree.configure(yscrollcommand=sb_y.set, xscrollcommand=sb_x.set)
        self.tree.pack(fill='both', expand='yes')

    def build_tree(self, parent, id_stroki):
        self.level += 1
        id = self.tree.insert(id_stroki, 'end', text=parent)
        # -----------------
        col_w = tk_font.Font().measure(parent)
        if col_w > 1000:
            col_w -= 400
        elif col_w > 500:
            col_w -= 200
        elif col_w > 300:
            col_w -= 100
        col_w = col_w + 25 * self.level
        if col_w > self.tree.column('#0', 'width'):
            self.tree.column('#0', width=col_w)
        # -----------------
        for element in sorted(self.dict_group[parent]):
            self.build_tree(element, id)
        self.level -= 1

if __name__ == '__main__':
    dict_group = {'Nomenclature': ['ABC1', 'ABC2'],
                  'ABC1': ['ABC3', 'ABC4'],
                  'ABC2': ['ABC5'],
                  'ABC3': ['ABC______________________________________6'],
                  'ABC4': ['ABC--------------------------------------8'],
                  'ABC5': ['ABC######################################9'],
                  'ABC______________________________________6': [],
                  'ABC--------------------------------------8': [],
                  'ABC######################################9': []
                  }
    root = tk.Tk()
    myTest = TreeListBox(root, 'Nomenclature', dict_group)
    root.mainloop()