How to change ttk.Separator color

Question

I have a ttk.Separator widget and I would like it to be all black. I used ttk.Style() as follows

import Tkinter as TK
import ttk

self.line_style = ttk.Style()
self.line_style.configure("Line.TSeparator", background="#000000")
self.line = ttk.Separator(self.tk, orient=TK.VERTICAL, style="Line.TSeparator")
self.line.place(x = 1250,y = 0, height = self.tk.winfo_screenheight(), width = 8)

And the separator is black, 8 pixels wide, but it has a 1 pixel white line on the left side. Plase, do you know how could I get rid of it?

Answer 1

Unfortunately you can't get rid of the 1 pixel white line, the only available option to configure for a ttk Separator is the background option. You can see this by finding the layout of the Separator and then listing all of its configuration options as follows

s = ttk.Style()
print(s.layout('TSeparator')) # [('Separator.separator', {'sticky': 'nswe'})]
print(s.element_options('Separator.separator')) # ('-orient', '-background')

If you set the background color to something other than black you'd see that this 1 pixel border is not always white but somehow related to chosen background color, either a lighter or darker shade.

The most viable workaround is to simply insert a styled Frame (ttk or regular tkinter) of the desired width instead of using a separator

Answer 2

I know that this is an old post but I had the same issue and figured out a work around. When I create a 1 pixel high tkinter.Frame and stretch it out along the x-axis, I get something that looks like a ttk.Separator . Example:

import tkinter as tk

root = tk.Tk()

separator = tk.Frame(root, bg="blue", height=1, bd=0)
separator.pack(fill="x")

root.mainloop()

The colour of the separator is controlled by its bg keyword.