Tkinter - Preload window?

Question

I started building a python tkinter gui, the problem is, after adding many features to the gui, the loading started looking really ugly. When starting the m

Answer 1

Here are two more ideas for preloading a window before displaying anything to the user. Specifically, do not execute the mainloop of the application until loading is complete. The main disadvantage is that the program might a take a while to appear. Both the main function and the main method finish setting up the frame before the root window is ever displayed. The code at the bottom of the example randomly picks an implementation to run, but both version accomplish the same thing for the user.

#! /usr/bin/env python3
import contextlib
import random
import time
import tkinter


def main():
    root = tkinter.Tk()
    frame = Application(root)
    frame.setup_frame('Hello, world!', ' ' * 50)
    frame.grid()
    root.mainloop()


class Application(tkinter.Frame):

    @classmethod
    def main(cls):
        with cls.setup_root('Tkinter Program') as root:
            root.resizable(False, False)
            frame = cls(root)
            frame.setup_frame('Hello, world!', ' ' * 50)
            frame.grid()

    @staticmethod
    @contextlib.contextmanager
    def setup_root(title):
        tkinter.NoDefaultRoot()
        root = tkinter.Tk()
        root.withdraw()
        root.title(title)
        yield root
        root.after_idle(root.deiconify)
        root.mainloop()

    def setup_frame(self, *args):
        self.after_idle(self.__setup, *args)

    def __setup(self, *args):
        time.sleep(5)   # simulate taking a long time
        self.label = tkinter.Label(self, text='{1}{0}{1}'.format(*args))
        self.label.grid()
        self.button = tkinter.Button(
            self,
            text='Raise a KeyboardInterrupt exception.',
            command=lambda: self.throw(KeyboardInterrupt)
        )
        self.button.grid()

    @staticmethod
    def throw(kind):
        raise kind()


if __name__ == '__main__':
    random.choice((main, Application.main))()