How to make a window fullscreen in a secondary display with tkinter?

Question

I know how to make a window fullscreen in the \"main\" display, but even when moving my app\'s window to a secondary display connected to my PC, when I call:

Answer 1

Windows, Python 3.8

In this solution, pressing F11 will make the window fullscreen on the current screen.

Note that self.root.state("zoomed") is Windows specific according to doc.

self.root.overrideredirect(True) is weird in Windows and may have unwanted side effects. For instance I've had issues related to changing screen configuration with this option active.

#!/usr/bin/env python3
import tkinter as tk


class Gui:
    fullScreen = False

    def __init__(self):
        self.root = tk.Tk()
        self.root.bind("", self.toggleFullScreen)
        self.root.bind("", self.toggleFullScreen)
        self.root.bind("", self.quit)
        self.root.mainloop()

    def toggleFullScreen(self, event):
        if self.fullScreen:
            self.deactivateFullscreen()
        else:
            self.activateFullscreen()

    def activateFullscreen(self):
        self.fullScreen = True

        # Store geometry for reset
        self.geometry = self.root.geometry()

        # Hides borders and make truly fullscreen
        self.root.overrideredirect(True)

        # Maximize window (Windows only). Optionally set screen geometry if you have it
        self.root.state("zoomed")

    def deactivateFullscreen(self):
        self.fullScreen = False
        self.root.state("normal")
        self.root.geometry(self.geometry)
        self.root.overrideredirect(False)

    def quit(self, event=None):
        print("quiting...", event)
        self.root.quit()


if __name__ == '__main__':
    Gui()