Question

我确定我错过了一些简单的东西，但这一直在吞噬我。我正在尝试创建“答案字段”并根据下拉列表销毁它们。我可以将我的小部件设置得很好但是当我尝试调用我的销毁功能时，它不会产生错误或破坏任何东西。

当你在下拉菜单上点击“2”时，我会得到两个字段。当我点击“1”字段时，“B”应该消失。

不确定我做错了什么

这是我的代码：

import sys
from tkinter import *
from tkinter import messagebox
import winsound


testbuilder = Tk()
testbuilder.geometry('1000x400')
testbuilder.title('Input your questions and answers.')

class add_remove_answer_fields:
    def __init__(self, master, textbox_yheight, textbox_xwidth, letter_text):
        self.text_box = Text(master, height = textbox_yheight, width = textbox_xwidth)
        self.letter = Label(master, text = letter_text)

    def place_field(self, textbox_xpos,textbox_ypos,letter_xpos,letter_ypos):
        self.text_box.place(x=textbox_xpos, y=textbox_ypos)
        self.letter.place(x=letter_xpos, y=letter_ypos)

    def destroy_answer(self):
        self.text_box.destroy()
        self.letter.destroy()

def buildanswers(answer):
    aentry = add_remove_answer_fields(testbuilder, 2, 50, "A.")
    bentry = add_remove_answer_fields(testbuilder, 2, 50, "B.")


    if answer == "1":
        aentry.place_field(500, 31, 480, 40)
        bentry.destroy_answer()

    if answer == "2":
        aentry.place_field(500, 31, 480, 40)
        bentry.place_field(500, 72, 480, 81)
    # if answer == "3":
    # if answer == "4":
    # if answer == "5":
    # if answer == "6":
    # if answer == "7":

#picking amount of answers to show up
answer_amount = IntVar(testbuilder)
answer_amount_dropdown = OptionMenu(testbuilder, answer_amount, "1", "2", command = buildanswers)
answer_amount_dropdown.place (x = 20, y = 220)

# Question and answer fields
questionlabel = Label(testbuilder, text="Question")
questionlabel.place(x=1, y=1)
qentry = Text(testbuilder, height=10, width=50)
qentry.place(x=1, y=31)
answerlabel = Label(testbuilder, text="Answers")
answerlabel.place(x=500, y=1)

testbuilder.mainloop()

更新

朗诺里斯很好地回答了这个问题。以下是我认为执行上述代码的正确方法：

import sys
from tkinter import *
from tkinter import messagebox
import winsound


testbuilder = Tk()
testbuilder.geometry('1000x400')
testbuilder.title('Input your questions and answers.')

class add_remove_answer_fields:
    def __init__(self, master, textbox_yheight, textbox_xwidth, letter_text):
        self.text_box = Text(master, height = textbox_yheight, width = textbox_xwidth)
        self.letter = Label(master, text = letter_text)

    def place_field(self, textbox_xpos,textbox_ypos,letter_xpos,letter_ypos):
        self.text_box.place(x=textbox_xpos, y=textbox_ypos)
        self.letter.place(x=letter_xpos, y=letter_ypos)

    def forget_answer(self):
        self.text_box.place_forget()
        self.letter.place_forget()

def buildanswers(answer):


    if answer == '1':
        aentry.place_field(500, 31, 480, 40)
        print(len(testbuilder.winfo_children()))
        bentry.forget_answer()

    if answer == "2":
        aentry.place_field(500, 31, 480, 40)
        bentry.place_field(500, 72, 480, 81)
        print(len(testbuilder.winfo_children()))
    # if answer == "3":
    # if answer == "4":
    # if answer == "5":
    # if answer == "6":
    # if answer == "7":


aentry = add_remove_answer_fields(testbuilder, 2, 50, "A.")
bentry = add_remove_answer_fields(testbuilder, 2, 50, "B.")
#picking amount of answers to show up
answer_amount = IntVar(testbuilder)
answer_amount_dropdown = OptionMenu(testbuilder, answer_amount, "1", "2", command = buildanswers)
answer_amount_dropdown.place (x = 20, y = 220)

# Question and answer fields
questionlabel = Label(testbuilder, text="Question")
questionlabel.place(x=1, y=1)
qentry = Text(testbuilder, height=10, width=50)
qentry.place(x=1, y=31)
answerlabel = Label(testbuilder, text="Answers")
answerlabel.place(x=500, y=1)

testbuilder.mainloop()

Answer 1

正在发生的事情是你将小部件堆叠在一起。这样你就可以拥有2个'B'小部件。您删除了刚刚创建的那个，但另一个（从下拉列表中选择“2”）仍然存在。您可以通过将此print语句放在answer 1 test：

中来观察这一点

if answer == '1':
    aentry.place_field(500, 31, 480, 40)
    print(len(testbuilder.winfo_children()))
    bentry.destroy_answer()

每次选择“1”时，窗口小部件的数量会增加，但它们会叠加在一起，因此您无法看到它们。您可能应该在需要时创建小部件，而不是创建一堆并在之后丢弃。

无法销毁类中调用的窗口小部件。蟒蛇

1 个答案: