Tkinter: pack's anchor option is not working-CodePudding

I've two file for my app, and in my second one page_one.py I can't use properly the anchor method. The label 'left' and 'right' are always positioned in the middle of the screen and not on the side

# main.py
import tkinter as tk
from page_one import PageOne

class Main(tk.Frame):
  def __init__(self, parent, *args, **kwargs):
    tk.Frame.__init__(self, parent, *args, **kwargs)

    self.page_one = PageOne(self)
    self.page_one.pack(expand='True')

if __name__ == "__main__":
  root = tk.Tk()
  main = Main(root)
  root.attributes("-fullscreen", True)
  main.pack(side="top", fill="both", expand=True)
  root.mainloop()

# page_one.py
import tkinter as tk

class PageOne(tk.Frame):
    def __init__(self, parent, *args, **kwargs):
        tk.Frame.__init__(self, parent, *args, **kwargs)  
                                                            
        self.one_label = tk.Label(self, text='LEFT')
        self.one_label.pack(padx=(20,0), side='left', anchor='w')  

        self.two_label = tk.Label(self, text='RIGHT')
        self.two_label.pack(padx=(0,20), side='right', anchor='e') 

if __name__ == "__main__":
    root = tk.Tk()
    PageOne(root).pack(side="top", fill="both", expand=True)
    root.mainloop()

How can I make the anchor option works?

CodePudding user response：

That's because your PageOne frame doesn't fill Main. Add fill="both" to its pack method as well:

import tkinter as tk

class PageOne(tk.Frame):
    def __init__(self, parent, *args, **kwargs):
        super().__init__(parent, *args, **kwargs)  
                                                            
        self.one_label = tk.Label(self, text='LEFT')
        self.one_label.pack(padx=(20,0), side='left', anchor='w')  

        self.two_label = tk.Label(self, text='RIGHT')
        self.two_label.pack(padx=(0,20), side='right', anchor='e') 
 

class Main(tk.Frame):
  def __init__(self, parent, *args, **kwargs):
    super().__init__(parent, *args, **kwargs)

    self.page_one = PageOne(self)
    self.page_one.pack(expand='True', fill="both")

if __name__ == "__main__":
  root = tk.Tk()
  main = Main(root)
  #root.attributes("-fullscreen", True)
  root.geometry("1280x720")
  main.pack(side="top", fill="both", expand=True)
  root.mainloop()

Note that you can use super() in your init functions (without self as argument)

CodePudding user response：

You have to specify fill="both" when packing the PageOne frame for it to expand completely in the x and y axis. Update your main.py accordingly.

# main.py
import tkinter as tk
from page_one import PageOne

class Main(tk.Frame):
  def __init__(self, parent, *args, **kwargs):
    tk.Frame.__init__(self, parent, *args, **kwargs)

    self.page_one = PageOne(self)
    self.page_one.pack(fill="both", expand='True')

if __name__ == "__main__":
  root = tk.Tk()
  main = Main(root)
  root.attributes("-fullscreen", True)
  main.pack(side="top", fill="both", expand=True)
  root.mainloop()