CODEWITHSUNDEEP
pythonbuttontexttkintertoggle
blast_uk
blast_uk

Reputation: 125

Beginner - GUI toggle button

Can i ask for a little help please? I've created a GUI with a toggle button which toggles the LED ON, LED OFF.

What i would like to do now is add some code to change the text of the button as it toggles between the two states.

I've looked up some examples but I can't quite see how, or where, to add the code to make the button text toggle as well.

Thanks for any help.

My code....

# Idle 07_02_LED ON using GUI
from time import sleep

from Tkinter import *

class App:

    def __init__(self, master): 
        frame = Frame(master)
        frame.pack()
        Label(frame, text='Turn LED ON').grid(row=0, column=0)

        Label(frame, text='Turn LED OFF').grid(row=1, column=0)

        button = Button(frame, text='LED 0 ON', command=self.convert0)
        button.grid(row=2, columnspan=2)


    def convert0(self, tog=[0]):

        tog[0] = not tog[0]
        if tog[0]:
        print('LED 0 OFF')

        else:
        print('LED 0 ON')

root = Tk()

root.wm_title('LED on & off program')

app = App(root)

root.mainloop()

Upvotes: 5

Views: 6908

Answers (1)

user2555451
user2555451

Reputation:

You need to do two things:

  1. Define the button as self.button so that it becomes an instance attribute of App. That way, you can access it inside convert0 through self.

  2. Use Tkinter.Button.config to update the button's text.

Below is a fixed version of the script. I put the stuff I changed in comment boxes:

# Idle 07_02_LED ON using GUI
from time import sleep

from Tkinter import *

class App:

    def __init__(self, master): 
        frame = Frame(master)
        frame.pack()
        Label(frame, text='Turn LED ON').grid(row=0, column=0)

        Label(frame, text='Turn LED OFF').grid(row=1, column=0)

        ####################################################################
        self.button = Button(frame, text='LED 0 ON', command=self.convert0)
        self.button.grid(row=2, columnspan=2)
        ####################################################################


    def convert0(self, tog=[0]):

        tog[0] = not tog[0]
        if tog[0]:
        #########################################
            self.button.config(text='LED 0 OFF')
        #########################################

        else:
        #########################################
            self.button.config(text='LED 0 ON')
        #########################################

root = Tk()

root.wm_title('LED on & off program')

app = App(root)

root.mainloop()

Upvotes: 4

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