Tkinter provides numerous of universal widget methods or basic widget methods which works almost with all the available widgets.
winfo_ismapped() method –
This method is used to check whether the specified widget is visible or not. However, in this example, right after packing the widget back, the winfo_ismapped() method still returns the widget to be not mapped (false). Only after you clicked the button the second consecutive time it will update to be mapped (True).
Syntax: widget.winfo_ismapped()
Return Value: Returns True if widget is visible (or mapped), otherwise returns False.
Exception: If widget is destroyed, then it throws error.
Puython
from tkinter import *
from tkinter.ttk import *
import time
root = Tk()
def forget(widget):
widget.forget()
print ( "After Forget method called. Is widget mapped? = " ,
bool (widget.winfo_ismapped()))
def retrieve(widget):
widget.pack()
print ( "After retrieval of widget. Is widget mapped? = " ,
bool (widget.winfo_ismapped()))
b1 = Button(root, text = "Btn 1" )
b1.pack()
b2 = Button(root, text = "Btn 2" , command = lambda : forget(b1))
b2.pack()
b3 = Button(root, text = "Btn 3" , command = lambda : retrieve(b1))
b3.pack()
mainloop()
|
Output:
After first Btn 2 Press:
After First Btn 3 Press:
After Second Btn 3 Press:
winfo_exists() method –
This method is used to check if the specified widget exists or not i.e if the widget is destroyed or not.
Syntax: widget.winfo_exists()
Return value: Returns True if widget exists, False otherwise.
Python
from tkinter import *
from tkinter.ttk import *
root = Tk()
def dest(widget):
widget.destroy()
print ( "Destroy method called. Widget exists? = " ,
bool (widget.winfo_exists()))
def exist(widget):
print ( "Checking for existence = " , bool (widget.winfo_exists()))
b1 = Button(root, text = "Btn 1" )
b1.pack()
b2 = Button(root, text = "Btn 2" , command = lambda : dest(b1))
b2.pack()
b3 = Button(root, text = "Btn 3" , command = lambda : exist(b1))
b3.pack()
mainloop()
|
Output:



Note: If a widget is destroyed it cannot be retrieved again.