# tk_custom_scrollbar.py

# tk_custom_scrollbar.py

import tkinter as tk

def custom_scrollbar(master, target, orient=tk.VERTICAL, width=10):
    def set_scrollbar(scrollbar, low, high):
        low = float(low)
        high = float(high)
        cv.thumb_position = low
        cv.thumb_size = high - low
        redraw_scrollbar()

    def redraw_scrollbar():
        cv.delete("sbar")
        if cv.orient == tk.VERTICAL:
            thumb_height = cv.winfo_height() * cv.thumb_size
            thumb_y = cv.winfo_height() * cv.thumb_position
            cv.create_rectangle(0, thumb_y, cv.winfo_width(), thumb_y + thumb_height, fill="gray", tag="sbar")
        else:
            thumb_width = cv.winfo_width() * cv.thumb_size
            thumb_x = cv.winfo_width() * cv.thumb_position
            cv.create_rectangle(thumb_x, 0, thumb_x + thumb_width, cv.winfo_height(), fill="gray", tag="sbar")

    def on_press(event):
        if cv.orient == tk.VERTICAL:
            cv.dragging = event.y
        else:
            cv.dragging = event.x
        update_command()

    def on_motion(event):
        if cv.dragging is not False:
            if cv.orient == tk.VERTICAL:
                delta = event.y - cv.dragging
                cv.dragging = event.y
                cv.thumb_position += delta / cv.winfo_height()
            else:
                delta = event.x - cv.dragging
                cv.dragging = event.x
                cv.thumb_position += delta / cv.winfo_width()
            cv.thumb_position = max(0, min(1 - cv.thumb_size, cv.thumb_position))
            redraw_scrollbar()
            update_command()

    def on_release(event):
        cv.dragging = False

    def update_command():
        cmd("moveto", cv.thumb_position)

    cmd = target.yview
    cv = tk.Canvas(master, width=width)
    cv.orient = orient  # Set the orient attribute
    cv.bind("<ButtonPress-1>", lambda event: on_press(event))
    cv.bind("<B1-Motion>", lambda event: on_motion(event))
    cv.bind("<ButtonRelease-1>", lambda event: on_release(event))
    cv.dragging = False
    cv.thumb_position = 0.0
    cv.thumb_size = 0.0
    target.config(yscrollcommand=lambda low, high: set_scrollbar(scrollbar, low, high))
    return cv

root = tk.Tk()

listbox = tk.Listbox(root, height=10, width=20)
listbox.pack(side=tk.LEFT, fill=tk.BOTH, expand=True)

scrollbar = custom_scrollbar(root, listbox, orient=tk.VERTICAL)
scrollbar.pack(side=tk.RIGHT, fill=tk.Y)

for i in range(100):
    listbox.insert(tk.END, f"Item {i}")

root.mainloop()