为什么单击文本小部件后出现框架边框/线条（框架在画布内）tkinter

Question

i've the problem for make an GUI apps with python tkinter.

here is my sample code

import tkinter as tk

from tkinter import ttk

root = tk.Tk()

root.geometry('300x300')

root.title('CSV Editor')

notebook = ttk.Notebook(root)

notebook.pack(pady=10, expand=True)

tab_home = ttk.Frame(notebook, width=300, height=300)

notebook.add(tab_home, text='Home')

fr_home = tk.Frame(tab_home, background="white")

fr_home.grid(row=0, column=0)

fr_home_container_canvas = tk.Frame(fr_home, background="red")

fr_home_container_canvas.grid(row=0, column=0, sticky='nw')

fr_home_container_canvas.grid_rowconfigure(0, weight=1)

fr_home_container_canvas.grid_columnconfigure(0, weight=1)

fr_home_container_canvas.grid_propagate(False)

canvas_home = tk.Canvas(fr_home_container_canvas)

canvas_home.grid(row=0, column=0, sticky="news")

vsb = tk.Scrollbar(fr_home_container_canvas, orient="vertical", command=canvas_home.yview)

vsb.grid(row=0, column=1, sticky='ns')

canvas_home.configure(yscrollcommand=vsb.set)

fr_home_widget_canvas = tk.Frame(canvas_home, background="yellow")

canvas_home.create_window((0, 0), window=fr_home_widget_canvas, anchor='nw')

fr_home_widget_canvas.config(width=300, height=300, padx=10)

fr_home_container_canvas.config(width=300, height=300)

canvas_home.config(scrollregion=canvas_home.bbox("all"))


text_widget = tk.Text(fr_home_widget_canvas, width = 30, height = 10)

text_widget.grid(column=0, row=0)

root.mainloop()

if i run this code, this is the preview enter image description here

but when i click inside the text widget, in the frame appear line / border like this enter image description here

What is that line / border? how to remove it?

thank you so much:)

Answer 1

It is the highlight background which can be removed by setting highlightthickness=0 :

canvas_home = tk.Canvas(fr_home_container_canvas, highlightthickness=0)