Resizing window doesn't resize contents in tkinter

Question

I'm making my first GUI application and I've run into a silly problem. Resizing the main window doesn't resize its contents and leaves blank space. I've read the TKDocs and they only say you should use sticky and column/row weight attributes but I don't really understand how they work. Here's my code (only the part covering widgets, if you think problem isn't here I'll post the rest of it):

from tkinter import *
from tkinter import ttk

root = Tk()

mainframe = ttk.Frame(root, padding="3 3 12 12")
mainframe.grid(column=0, row=0, sticky=(N, W, E, S))
mainframe.columnconfigure(0, weight=1)
mainframe.rowconfigure(0, weight=1)

player1 = StringVar()
player2 = StringVar()
player1.set('Player 1')
player2.set('Player 1')
timer=StringVar()
running=BooleanVar()
running.set(0)
settimer = ttk.Entry(mainframe, width=7, textvariable=timer)
settimer.grid(column=2, row=1, sticky=(N, S))
ttk.Button(mainframe, text="Start", command=start).grid(column=2, row=2, sticky=(N, S))

ttk.Label(mainframe, textvariable=player1, font=TimeFont).grid(column=1, row=3, sticky=(W, S))
ttk.Label(mainframe, textvariable=player2, font=TimeFont).grid(column=3, row=3, sticky=(E, S))

for child in mainframe.winfo_children():
    child.grid_configure(padx=80, pady=10)

root.mainloop()

Thanks for your time!

Answer 1

Maybe this will help you in the right direction. Be sure to configure column/row weights at each level.

import tkinter.ttk
from tkinter.constants import *

class Application(tkinter.ttk.Frame):

    @classmethod
    def main(cls):
        tkinter.NoDefaultRoot()
        root = tkinter.Tk()
        app = cls(root)
        app.grid(sticky=NSEW)
        root.grid_columnconfigure(0, weight=1)
        root.grid_rowconfigure(0, weight=1)
        root.resizable(True, False)
        root.mainloop()

    def __init__(self, root):
        super().__init__(root)
        self.create_variables()
        self.create_widgets()
        self.grid_widgets()
        self.grid_columnconfigure(0, weight=1)

    def create_variables(self):
        self.player1 = tkinter.StringVar(self, 'Player 1')
        self.player2 = tkinter.StringVar(self, 'Player 2')
        self.timer = tkinter.StringVar(self)
        self.running = tkinter.BooleanVar(self)

    def create_widgets(self):
        self.set_timer = tkinter.ttk.Entry(self, textvariable=self.timer)
        self.start = tkinter.ttk.Button(self, text='Start', command=self.start)
        self.display1 = tkinter.ttk.Label(self, textvariable=self.player1)
        self.display2 = tkinter.ttk.Label(self, textvariable=self.player2)

    def grid_widgets(self):
        options = dict(sticky=NSEW, padx=3, pady=4)
        self.set_timer.grid(column=0, row=0, **options)
        self.start.grid(column=0, row=1, **options)
        self.display1.grid(column=0, row=2, **options)
        self.display2.grid(column=0, row=3, **options)

    def start(self):
        timer = self.timer.get()
        self.player1.set(timer)
        self.player2.set(timer)

if __name__ == '__main__':
    Application.main()