Tkinter - dialogs

INTRODUCTION

Dialogs are windows popped up by a script to provide or request additional information. Dialogs are generally implemented with the 'Toplevel' window object.

• 'Modal' dialogs block the rest of the interace until the dialog window is dismissed.
• 'Nonmodal' dialogs can remain on-screen indefinitely without interfering with other windows in the interface.

Tkinter comes with a collection of precoded (modal) dialog windows and they are called 'standard dialogs' or 'common dialogs'.

# dialog1.py
import tkinter as tk   # Py3
from tkinter import messagebox

root = tk.Tk()

def callback():
    if messagebox.askyesno("Verify", "Do you really want to quit?"):
        messagebox.showwarning("Yes", "Quit not implemented")
    else:
        messagebox.showinfo("No", "Quit has been cancelled")

button1 = tk.Button(root, text="Quit", command=callback)
button1.grid(sticky=tk.EW)

button2 = tk.Button(root, text="Spam", command=lambda:
    messagebox.showerror("Error", "Error message"))
button2.grid(sticky=tk.EW)

root.mainloop() 

# The first group of standard dialogs is used to present information. 

messagebox.showinfo("Info", "Some info")
messagebox.showwarning("Warning", "Warning message")
messagebox.showerror("Error", "Error message")

# The second group is used to ask questions.

reply = messagebox.askquestion("Title", "Question?")   # return yes/no
reply = messagebox.askokcancel("Title", "Proceed?")   # return True/False
reply = messagebox.askretrycancel("Title", "Try again?")   # return True/False
reply = messagebox.askyesno("Print", "Print this report?")   # return True/False
reply = messagebox.askyesnocancel("Print", "Print this report?")   # return True/False/None