CODEWITHSUNDEEP
pythontkinterwindows-10
SpitfireCode
SpitfireCode

Reputation: 13

Is it possible to change a tkinter application's theme based on Windows 10's current light/dark theme configuration?

How could I make a tkinter application capable of automatically changing its colour scheme to a dark one when the user changes Windows 10 colour app mode from Light to Dark and viceversa?

Upvotes: 1

Views: 3245

Answers (1)

Henry Yik
Henry Yik

Reputation: 22503

You can use root.after to check for changes in registry.

from winreg import *
import tkinter as tk

root = tk.Tk()
root.config(background="white")
label = tk.Label(root,text="Light mode on")
label.pack()

def monitor_changes():
    registry = ConnectRegistry(None, HKEY_CURRENT_USER)
    key = OpenKey(registry, r'SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize')
    mode = QueryValueEx(key, "AppsUseLightTheme")
    root.config(bg="white" if mode[0] else "black")
    label.config(text="Light Mode on" if mode[0] else "Dark Mode on",
                 bg="white" if mode[0] else "black",
                 fg="black" if mode[0] else "white")
    root.after(100,monitor_changes)

monitor_changes()

root.mainloop()

For completeness, here is how you configure a ttk.Style object to change the theme:

root = tk.Tk()
style = ttk.Style()
style.configure("BW.TLabel",foreground="black",background="white")
label = ttk.Label(root,text="Something",style="BW.TLabel")
label.pack()

def monitor_changes():
    ...
    style.configure("BW.TLabel",foreground="black" if mode[0] else "white", background="white" if mode[0] else "black")
    ...

Upvotes: 2

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