当我更改所需的文本文件时，如何让 tkinter 应用程序更新？

Question

我有一个文本文件，其中包含需要在滚动框 tkinter 中显示的值。我已经成功地做到了这一点，但有一个问题。当我按下提交向程序中的文本文件添加更多值时，显示文本文件内容的滚动框不会更新为新值。

这是程序的截图：

这是我的文本文件：

amazon.com
username@gmail.com
n3*F/X"qse~a`_+

netflix.com
username@outlook.com
avOmCl|Jb?O<

apple.com
username@icloud.com
s=DT8n*Y"y

但是，当我按下提交时，文本文件会使用提交的值更新，但滚动框不会。

这是我的完整代码：

import string
import random
from tkinter import * 
import tkinter.scrolledtext as st 

mypasslist = []

with open("password&usernames.txt", "r") as input:
    for line in input:
        items = line.split()
        mypasslist.append([item for item in items[0:]])


def generatePassword():
    characters = string.ascii_letters + string.punctuation  + string.digits
    password =  "".join(random.choice(characters) for x in range(random.randint(8, 16)))
    return password

def writeToFile(input_variable):
    with open("password&usernames.txt", "a") as input:
        input.writelines(input_variable)

top = Tk()    
top.geometry("1920x1080")   

def ifSubmit():
    global a
    a = generatePassword()
    label1 = Label(top, text='Your password is: %s' % a, font=("Arial", 11)).place(x = 40, y = 170)
    label1 = Label(top, justify='left', text='Your password and username has been saved, you can access them below.').place(x = 40, y = 227)
    copy_button = Button(top, text = 'Copy', command=copyText).place(x=40, y=195)
    
    service = service_var.get()
    username = username_var.get()

    writeToFile('%s\n' % str(service))
    writeToFile('%s\n' % str(username))
    writeToFile('%s\n' % str(a))
    writeToFile('\n')

def copyText():
    top.clipboard_clear()
    top.clipboard_append(a)
    top.update()

# the label for user_name  
Service = Label(top, text = "Service").place(x = 40, y = 60)   
user_name = Label(top, text = "Username").place(x = 40, y = 100)   

submit_button = Button(top, text = "Submit", command=ifSubmit)
submit_button.place(x = 40, y = 130)

service_var = StringVar()
Service_input_area = Entry(top, width = 30, textvariable=service_var)
Service_input_area.place(x = 110, y = 60)
service = service_var.get()

username_var = StringVar()
user_name_input_area = Entry(top, width = 30, textvariable=username_var)
username = username_var.get()
user_name_input_area.place(x = 110, y = 100)

text_area = st.ScrolledText(top, width = 50, height = 10) 
  
text_area.grid(column = 0, pady = 260, padx = 40) 

for i in mypasslist:
    text_area.insert(INSERT, i)
    text_area.insert(INSERT, '\n')

text_area.configure(state ='disabled') 

top.mainloop()

那么我怎样才能在每次提交新值时更新程序呢？

Answer 1

我得到它的工作，我必须这样做：

def writeToFile(input_variable):
    with open("password&usernames.txt", "a") as input:
        input.writelines(input_variable)
    text_area['state'] = NORMAL
    text_area.insert(INSERT, input_variable)
    text_area['state'] = DISABLED