# tk_power_listbox.py

# tk_power_listbox.py

from tkinter import *

root = Tk()
root.title("tk_power_listbox")
menu_options = list(range(300))
frame = Frame(root)
frame.pack()
label = Label(frame, text="Hello Tkinter")
label.pack(side=LEFT)
text_box = Text(frame, height=1, bg='yellow')
text_box.pack(side=LEFT, padx=3, pady=3)

def on_active(event):
    global selected_index
    listbox2.itemconfig(selected_index, bg='white')
    selected_index = listbox2.nearest(event.y)
    listbox2.itemconfig(selected_index, bg='yellow')

def on_select(event):
    selection = listbox2.curselection()[0]
    text_box.delete('1.0', END)  # Clear the previous text
    text_box.insert(END, str(menu_options[selection]))  # Insert the new text
    root2.destroy()

screen_h = root.winfo_screenheight()

def on_enter(event):
    global root2, listbox2, selected_index
    try:
        root2.destroy()
    except:
        pass
    selected_index = 0
    root2 = Toplevel()
    root2.overrideredirect(True)
    Lmenu = min(30, len(menu_options))
    Lb2 = Lmenu * 14
    listbox2 = Listbox(root2, height=Lmenu)
    yyy = root.winfo_y() + 20
    if yyy + Lb2 > screen_h:
        yyy = screen_h - Lb2
    root2.geometry("+{}+{}".format(text_box.winfo_x() + root.winfo_x() + 8, yyy))
    for option in menu_options:
        listbox2.insert(END, option)
    scrollbar = Scrollbar(root2, orient=VERTICAL, command=listbox2.yview)
    scrollbar.pack(side=RIGHT, fill=Y)
    scrollbar.config(width=40)
    listbox2.config(yscrollcommand=scrollbar.set)
    root2.bind("<Motion>", on_active)
    root2.bind("<Leave>", on_leave)
    listbox2.bind("<<ListboxSelect>>", on_select)
    listbox2.pack()

def on_leave(event):
    x = root.winfo_pointerx()
    geom = root2.geometry()
    x2y2, w, h = geom.split("+")
    x2, y2, w, h = [int(i) for i in x2y2.split("x") + [w, h]]
    if (x < x2 + w - 50 or x > x2 + w):
        root2.destroy()
    # destroys if outside of top or bottom automaticallY? nice

text_box.bind("<Button-1>", on_enter)  # Bind on_enter to left mouse click
root.mainloop()