Question

我正在创建一个函数，在其中我将文本文件的内容输出到Tkinter中的“Message”小部件。用户选择对应于文本文件的选项，然后按“确定”。

我遇到的问题是，在选择两个连续选项后，我不知道如何清除消息框。

问题：在输出第二个文本之前，如何清除第一个文本的消息框？目前，第二个文本输出在第一个文本的顶部。

我尝试过Message.delete和Message.clear，但我认为它们不适用于消息小部件。

任何帮助都将不胜感激。

这是我的代码：

def learn(event):
    ''' This function creates a new window within the main window, passes an event(left mouse click), and creates a text heading'''
    root = Toplevel(window)

    menu_choice = StringVar(root)
    menu_choice.set("Select") # initial value

    selection_message = Message(root, text = "Choose which area of finances you'd like to learn about below!", width = 180)
    selection_message.grid(row = 0, column = 0, columnspan = 6)

    menu_options = OptionMenu(root, menu_choice, "Stocks", "Bonds", "Index Funds", "Exchange Traded Funds (ETF's)")
    menu_options.grid(row = 1, column = 2)

    def selection():
        learn_area = menu_choice.get()
        learn_file = open('C:\\Users\\nicks_000\\PycharmProjects\\untitled\\SAT\\GUI\\Text Files\\{0}.txt'.format(learn_area))
        learn_text = learn_file.read()
        learn_file.close()

        about_message = Message(root, text = learn_text, width = 300, relief = RAISED)
        about_message.grid(row = 3, column = 0, columnspan = 6)

    selection_button = Button(root, text="OK", command=selection)
    selection_button.grid(row = 2, column = 2)

Answer 1

您的问题是您在选择功能中创建了about_message窗口小部件，因此每次调用该函数时都会重新创建一个窗口小部件。我建议你在选择功能之外创建小部件，这样你就可以about_message.configure(text="new text")。这是代码：

from tkinter import *

window = Tk()

def learn():
    ''' This function creates a new window within the main window, passes an event(left mouse click), and creates a text heading'''
    root = Toplevel(window)

    menu_choice = StringVar(root)
    menu_choice.set("Select") # initial value

    selection_message = Message(root, text = "Choose which area of finances you'd like to learn about below!", width = 180)
    selection_message.grid(row = 0, column = 0, columnspan = 6)

    menu_options = OptionMenu(root, menu_choice, "Stocks", "Bonds", "Index Funds", "Exchange Traded Funds (ETF's)")
    menu_options.grid(row = 1, column = 2)

    def selection():
        learn_area = menu_choice.get()
        learn_file = open('C:\\Users\\nicks_000\\PycharmProjects\\untitled\\SAT\\GUI\\Text Files\\{0}.txt'.format(learn_area))
        learn_text = learn_file.read()
        learn_file.close()
        about_message.configure(text=learn_text)  

    selection_button = Button(root, text="OK", command=selection)
    selection_button.grid(row = 2, column = 2)
    # create about_message outside the selection function
    # to be able to modify its content
    about_message = Message(root, text = "", width = 300, relief = RAISED)
    about_message.grid(row = 3, column = 0, columnspan = 6)

Button(window,text="test", command=learn).pack()
window.mainloop()

Tkinter清除邮件小部件

1 个答案: