在Tkinter中单击后禁用按钮 [英] Disabling buttons after click in Tkinter

问题描述

我是Python的新手，我正在尝试使用Tkinter制作一个简单的应用程序.

I'm new to Python and I'm trying to make a simple application using Tkinter.

def appear(x):
    return lambda: results.insert(END, x)

letters=["A", "T", "D", "M", "E", "A", "S", "R", "M"] 

for index in range(9): 
    n=letters[index] 
    nButton = Button(buttons, bg="White", text=n, width=5, height=1,
    command =appear(n), relief=GROOVE).grid(padx=2, pady=2, row=index%3,
    column=index/3)

我要尝试的是单击按钮后将其禁用.我尝试过

What I'm trying to do is disable the buttons once I click them. I tried

def appear(x):
    nButton.config(state="disabled")
    return lambda: results.insert(END, x)

但这给了我以下错误:

NameError:未定义全局名称'nButton'

NameError: global name 'nButton' is not defined

推荐答案

这里有一些问题:

1. 每当动态创建窗口小部件时，都需要将对它们的引用存储在集合中，以便以后可以访问它们.

1. Whenever you create widgets dynamically, you need to store references to them in a collection so that you can access them later.

Tkinter小部件的 grid 方法始终返回 None .因此，您需要将对 grid 的所有呼叫放在自己的线路上.

The grid method of a Tkinter widget always returns None. So, you need to put any calls to grid on their own line.

每当将按钮的 command 选项分配给需要参数的函数时，都必须使用 https://stackoverflow.com/a/20556892/2555451 .

Whenever you assign a button's command option to a function that requires arguments, you must use a lambda or such to "hide" that call of the function until the button is clicked. For more information, see https://stackoverflow.com/a/20556892/2555451.

以下是解决所有这些问题的示例脚本:

Below is a sample script addressing all of these issues:

from Tkinter import Tk, Button, GROOVE

root = Tk()

def appear(index, letter):
    # This line would be where you insert the letter in the textbox
    print letter

    # Disable the button by index
    buttons[index].config(state="disabled")

letters=["A", "T", "D", "M", "E", "A", "S", "R", "M"]

# A collection (list) to hold the references to the buttons created below
buttons = []

for index in range(9): 
    n=letters[index]

    button = Button(root, bg="White", text=n, width=5, height=1, relief=GROOVE,
                    command=lambda index=index, n=n: appear(index, n))

    # Add the button to the window
    button.grid(padx=2, pady=2, row=index%3, column=index/3)

    # Add a reference to the button to 'buttons'
    buttons.append(button)

root.mainloop()

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