Real-time change mode/theme

[OlegXio]

Hello, I need to change the mode (light/dark) of an application while it is running, how can this be implemented correctly? I tried it:

import tkinter as tk
from tkinter import ttk
import TKinterModernThemes as TKMT

class SetUp(TKMT.ThemedTKinterFrame):
    def __init__(self, theme, mode, usecommandlineargs=True, usethemeconfigfile=True):
        def changethemecolor():
            mode = self.mode
            if mode == 'light':
                mode = 'dark'
            elif mode == 'dark':
                mode = 'light'
            self.master.destroy()
            SetUp(theme, mode)
        button_qwer = tk.Button(self.master, text="Change themecolor", command=changethemecolor, highlightthickness=0, bd=0, anchor='ne')
        button_qwer.grid(row=1, column=3, padx=3, pady=0)
        self.run()

But my application restarts by itself, but one of the buttons is in a separate window for some reason. If I remove the function of closing the old window self.master.destroy(), the mode changes for the old application too, but without calling the new window it doesn't change in any of the windows :(

[OlegXio]

Ok, I solved the problem with the button appearing in a new window: it needed to be given a parent (self.master) as the first argument. However, still with such a crummy theme change an empty window appears:

[RobertJN64]

You can swap the theme in real time by using self.root.tk.call("set_theme", "light") or self.root.tk.call("set_theme", "dark") in the application class.

import TKinterModernThemes as TKMT

class App(TKMT.ThemedTKinterFrame):
    def __init__(self, theme, mode, usecommandlineargs=True, usethemeconfigfile=True):
        super().__init__("Theme Demo", theme, mode,
                         usecommandlineargs=usecommandlineargs, useconfigfile=usethemeconfigfile)

        self.frame = self.addLabelFrame("Accent Button Frame")
        self.frame.AccentButton("Accent Button", self.handle_button_click)
        self.run()

    def handle_button_click(self):
        self.root.tk.call("set_theme", "light")

if __name__ == "__main__":
    App("park", "dark")

[RobertJN64]

I added some example code to show swapping between light and dark themes.

https://github.com/RobertJN64/TKinterModernThemes/blob/master/TKinterModernThemes/examples/theme_swap.py

Please let me know if you need anything else!

[OlegXio]

thank you, that helped for me. However, I had to change the theme button image along with the theme update, which I easily fixed through reinitializing the button and self.run(). Again, thanks