How to Change Tkinter Button State?
Tkinter is a Python Package for creating GUI applications. Python has a lot of GUI frameworks, but Tkinter is the only framework that’s built into the Python standard library. Tkinter has several strengths; it’s cross-platform, so the same code works on Windows, macOS, and Linux. Tkinter is lightweight and relatively painless to use compared to other frameworks.
In this article, we are going to learn how we can change the state of a Button.
Let's understand this with step-wise:
Step 1: First we are going to import the Tkinter module and some widgets that we need.
# importing tkinter module
# along with some constants and Widgets
from tkinter import Tk
from tkinter.constants import DISABLED, NORMAL
from tkinter.ttk import Button, Label
If you are using Python2 then change tkinter to Tkinter and also tkinter.ttk will not also work so import widgets from Tkinter itself.
Step 2: Now we are going to create an App class that will contain all the Buttons and Labels.
# Creating App class which
# will contain our overall App
class App:
def __init__(self, master) -> None:
# Instantiating master i.e toplevel Widget
self.master = master
# Creating label
self.label = Label(self.master,
text = "Click Button2 to change Button1 State")
self.label.pack(pady = 10)
# Creating button1
# We will change the state of this Button
# it has a initial state of "NORMAL"
# i.e Button can be pressed
self.button1 = Button(self.master,
text = "Button1",
state = NORMAL)
self.button1.pack(pady = 20)
# Creating another button
# We will use this button to
# change the State of first button
self.button2 = Button(self.master,
text = "Button2",
command = self.changeState)
self.button2.pack(pady = 20)
Step 3: As you can see in the above code, we have a function attached with Button2 i.e changeState function next we are going to implement this function. In this function, we will change the State of Button1.
# Helper function which will change the State of Button1
def changeState(self) -> None:
# Printing the State of
# the Button before ALTERING it
# This is optional
print(self.button1['state'])
# Checking if the STATE of the Button1
# If the STATE is NORMAL
if (self.button1['state'] == NORMAL):
# Change the state to DISABLED
self.button1['state'] = DISABLED
else:
# Otherwise, change the state to NORMAL
self.button1['state'] = NORMAL
Step 4: In this step, we will create the main function that will run this application. In the main function, we will set the application title and geometry and instantiate our App class.
if __name__ == "__main__":
# Instantiating top level
root = Tk()
# Setting the title of the window
root.title("Button State App")
# Setting the geometry i.e Dimensions
root.geometry("400x250")
# Calling our App
app = App(root)
# Mainloop which will cause
# this toplevel to run infinitely
root.mainloop()
Below is the full implementation:
# importing tkinter module
# along with some constants and Widgets
from tkinter import Tk
from tkinter.constants import DISABLED, NORMAL
from tkinter.ttk import Button, Label
# Creating App class
# which will contain our overall App
class App:
def __init__(self, master) -> None:
# Instantiating master
# i.e toplevel Widget
self.master = master
# Creating label
self.label = Label(self.master,
text="Click Button2 to change Button1 State")
self.label.pack(pady = 10)
# Creating button1
# We will change the state of this Button
# it has a initial state of
# "NORMAL" i.e Button can be pressed
self.button1 = Button(self.master,
text = "Button1",
state = NORMAL)
self.button1.pack(pady = 20)
# Creating another button
# We will use this button
# to change the State of first button
self.button2 = Button(self.master,
text = "Button2",
command = self.changeState)
self.button2.pack(pady = 20)
# Helper function which will
# change the State of Button1
def changeState(self) -> None:
# Printing the State of
# the Button before ALTERING it
# This is optional
print(self.button1['state'])
# Checking if the STATE of the Button1
# If the STATE is NORMAL
if (self.button1['state'] == NORMAL):
# Change the state to DISABLED
self.button1['state'] = DISABLED
else:
# Otherwise, change the state to NORMAL
self.button1['state'] = NORMAL
if __name__ == "__main__":
# Instantiating top level
root = Tk()
# Setting the title of the window
root.title("Button State App")
# Setting the geometry i.e Dimensions
root.geometry("400x250")
# Calling our App
app = App(root)
# Mainloop which will cause this toplevel
# to run infinitely
root.mainloop()
Output:
