incorrect button width using grid in tkinter-CodePudding

Somehow the buttons placed using grid method will be much bigger than the cell width defined by columnconfigure. I tried to place some test labels in the same way, and it worked as expected. Is there any way to get correct button width like these labels did?

Below is the simplified code to the question:

import tkinter as tk
from tkinter.ttk import *

root = tk.Tk()   

style = Style()
style.theme_use('clam')    
style.configure('TestLabel1.TLabel', background='red')
style.configure('TestLabel2.TLabel', background='green')
style.configure('TestLabel3.TLabel', background='blue')
style.configure('Buttons.TButton')

output_path = tk.StringVar()
output_path.set('test')
settings = Frame(root, width=500, height=200)
settings.pack_propagate(0)
settings.pack(side='top')
chart_preset_frame = LabelFrame(settings, text='Chart Parameter Preset', padding=(5, 5, 5, 5))
chart_preset_frame.pack(expand=True, fill='x', pady=10, side='top')
chart_preset_frame.columnconfigure(0, weight=6)
chart_preset_frame.columnconfigure(1, weight=2)
chart_preset_frame.columnconfigure(2, weight=2)        
output_path_input = Entry(chart_preset_frame, textvariable=output_path, width=20)
output_path_input.grid(row=0, column=0, columnspan=3, sticky='EW', ipady=5)

output_load_btn = Button(chart_preset_frame, text='Load...', style='Buttons.TButton', command=None)
output_load_btn.grid(row=1, column=1, sticky='EW', padx=0, pady=5)

output_save_btn = Button(chart_preset_frame, text='Save As...', style='Buttons.TButton', command=None)
output_save_btn.grid(row=1, column=2, sticky='EW', padx=0, pady=5) 

# for label test
# label_test_1 = Label(chart_preset_frame, text='test', style='TestLabel1.TLabel')
# label_test_1.grid(row=1, column=0, sticky='EW')
# label_test_2 = Label(chart_preset_frame, text='test', style='TestLabel2.TLabel')
# label_test_2.grid(row=1, column=1, sticky='EW')
# label_test_3 = Label(chart_preset_frame, text='test', style='TestLabel3.TLabel')
# label_test_3.grid(row=1, column=2, sticky='EW')
           
root.mainloop()

CodePudding user response：

weight is just a guideline to the layout manager how to distribute available spaces. Since there is no widget in cell (row 1, column 0), it may not get the required space.

It can be enforced by adding uniform=1 to those columnconfigur(...):

chart_preset_frame.columnconfigure(0, weight=6, uniform=1)
chart_preset_frame.columnconfigure(1, weight=2, uniform=1)
chart_preset_frame.columnconfigure(2, weight=2, uniform=1)

Result: