Centering window python tkinter

Ok I have found and fixed the problem. Piggybacking off of OregonTrail's solution, i found that if the window is the right size and you just want to change the location, then you can easily instead of setting the root's size, you can just move the window to the center.

w = root.winfo_reqwidth()h = root.winfo_reqheight()ws = root.winfo_screenwidth()hs = root.winfo_screenheight()x = (ws/2) - (w/2)y = (hs/2) - (h/2)root.geometry('+%d+%d' % (x, y)) ## this part allows you to only change the location

I think that this answer isn't exactly in the center, probably off by a little since h was returning 200 when it should be less, but it looks to be at the center and works fine.

You need to use winfo_reqwidth() and winfo_reqheight(), because the window does not have a height or width at the time that you call winfo_height() and winfo_width().

An example program:

from tkinter import Tkfrom tkinter import ttkroot = Tk()style = ttk.Style()style.configure("BW.TLabel", foreground="black", background="white")l1 = ttk.Label(text="This is the best label in the world", style="BW.TLabel")l1.pack()w = l1.winfo_reqwidth()h = l1.winfo_reqheight()ws = root.winfo_screenwidth()hs = root.winfo_screenheight()x = (ws/2) - (w/2)y = (hs/2) - (h/2)print(w, h, x, y)root.geometry('%dx%d+%d+%d' % (w, h, x, y))root.mainloop()

Hopefully someone will find use of this code, basically this is a solution you can use to center a TopLevel window relative to master (parent) window.Probably not the cleanest solution, but it will get the work done.

from Tkinter import *class PasswordDialog(Toplevel):    def __init__(self, master=None):        Toplevel.__init__(self, master)        self.master = master        self.title("Password")        self.label_info = Label(self, text="You need to enter your password", pady=10)        self.label_info.grid(row=0, column=0, columnspan=2, padx=20, pady=10, sticky="ew")        self.label_pw = Label(self, text="Enter password:", pady=10)        self.label_pw.grid(row=1, column=0, padx=(20, 2), sticky="e")        self.entry = Entry(self, show="*")        self.entry.bind("<KeyRelease-Return>", self.store_pass_event)        self.entry.grid(row=1, column=1, padx=(2,20), sticky="w")        self.button = Button(self, command=self.store_pass, text="Log in")        self.button.grid(row=2, column=0, columnspan=2, pady=10)        self.update()        size = tuple(int(_) for _ in self.geometry().split('+')[0].split('x'))        parent_offset = tuple(int(_) for _ in self.master.geometry().split('x')[1].split('+'))        parent_width = self.master.winfo_width()        parent_height = self.master.winfo_height()                x = parent_width//2 - size[0]//2 + parent_offset[1]        y = parent_height//2 - size[1]//2 + parent_offset[2]        self.geometry("+%d+%d" % (x, y))    def store_pass_event(self, event):        self.store_pass()    def store_pass(self):        self.master.password = self.entry.get()        self.destroy()