Python TKinter 进度条 label 动作不正确

Question

I have really simple program with two progress bars in a window. I try only update the first progress bar, but the second progress bars label updates as well, when it shouldn't.

I am using j_4321's answer from this post on progress bar labels.

import tkinter as tk
from tkinter import ttk

root = tk.Tk()


# Progress bar #1
style_1 = ttk.Style(root)
style_1.layout('text.Horizontal.TProgressbar',
               [('Horizontal.Progressbar.trough',
                 {'children': [('Horizontal.Progressbar.pbar',
                                {'side': 'left', 'sticky': 'ns'})],
                  'sticky': 'nswe'}),
                ('Horizontal.Progressbar.label', {'sticky': ''})])
style_1.configure('text.Horizontal.TProgressbar', text='0 %')
variable_1 = tk.DoubleVar(root)
pbar_1 = ttk.Progressbar(root, style='text.Horizontal.TProgressbar', variable=variable_1)
pbar_1.pack()


# Progress bar #2
style_2 = ttk.Style(root)
style_2.layout('text.Horizontal.TProgressbar',
               [('Horizontal.Progressbar.trough',
                 {'children': [('Horizontal.Progressbar.pbar',
                                {'side': 'left', 'sticky': 'ns'})],
                  'sticky': 'nswe'}),
                ('Horizontal.Progressbar.label', {'sticky': ''})])
style_2.configure('text.Horizontal.TProgressbar', text='0 %')
variable_2 = tk.DoubleVar(root)
pbar_2 = ttk.Progressbar(root, style='text.Horizontal.TProgressbar', variable=variable_2)
pbar_2.pack()


def increment():
    # This dosn't change pbar_2's value, as it should act.
    pbar_1.step()

    # Why does this style_1.configure also change the text from style_2 as well???
    style_1.configure('text.Horizontal.TProgressbar', text='{:g} %'.format(variable_1.get()))
    root.after(200, increment)


increment()

root.mainloop()

Answer 1

You get this weird behavior because you use the same layout. To fix this change the name of the second layout. In this case I added '1' to the name: 'text.Horizontal.TProgressbar1'

style_2 = ttk.Style(root)
style_2.layout('text.Horizontal.TProgressbar1',
               [('Horizontal.Progressbar.trough',
                 {'children': [('Horizontal.Progressbar.pbar',
                                {'side': 'left', 'sticky': 'ns'})],
                  'sticky': 'nswe'}),
                ('Horizontal.Progressbar.label', {'sticky': ''})])
                
style_2.configure('text.Horizontal.TProgressbar1', text='0 %')
variable_2 = tk.DoubleVar(root)

pbar_2 = ttk.Progressbar(root, style='text.Horizontal.TProgressbar1', variable=variable_2)
pbar_2.pack()

Answer 2

Both of your scrollbars are using the same layout named "text.Horizontal.TProgressbar". When you change that layout, it will change all widgets that use that layout.

The fact that you're using style_1 and style_2 doesn't matter. What matters is the name of the layout you are configuring.