Tkinter 消息框导致 Entry 禁用

Question

So I was creating a simple input window with Tkinter but whenever i have a showinfo displaying i can't type in the entry box

import tkinter as tk
from tkinter import *
from tkinter.messagebox import *


root = tk.Tk()
root.title("hello world")
root.minsize(700,600)

abc = StringVar()
abc.set("abc")
Entry(root, bd = 1, width = 50, textvariable=abc).pack(side = TOP)
showinfo('info', 'hello')
root.mainloop() 

I'm not sure if there is something wrong with my Python (3.4) or tkinter but whenever i take out the showinfo line I can type into the Entry box but when its there i can't.

Answer 1

tkinter messagebox default dialog boxes are modal . What this means is that you need to close the child window(the tkinter messagebox) before you can return to the parent application.

So, there is nothing wrong with your python or tkinter; This behavior is intended.

Don't show the tkinter messagebox before the event loop is started. Try this:

import tkinter as tk
from tkinter import *
from tkinter.messagebox import *


 def callback():
     showinfo("info", "hello")

 root = tk.Tk()
 root.title("hello world")
 root.minsize(700,600)

 abc = StringVar()
 abc.set("abc")
 Entry(root, bd=1, width=50, textvariable=abc).pack(side=TOP)
 Button(root, text="OK", command=callback).pack()
 root.mainloop()

Answer 2

The solution i made for this is overriding the messagebox.showerror so for example i made

import logging
from tkinter import messagebox

                                                           
logging.basicConfig(                                            
    level=logging.DEBUG,                                        
    format='%(asctime)s [%(levelname)s] %(name)s "%(message)s"',
)                                                               
LOGGER = logging.getLogger(__name__)                            

def test_showerror(title, message):              
    LOGGER.debug(f'{title} Message -> {message}')

messagebox.showerror = test_showerror

actually that's how i deal with many problems that face me during writing tests.. i override utility functions to add logging or avoid a case.