import PySimpleGUI as sg

"""
    Toggle Button Demo
    The background color of the button toggles between red and green
    The text of the button toggles between Off and On
"""

layout = [[sg.Text('A toggle button example')],
          [sg.Button('On', size=(3,1), button_color=('white', 'green'), key='_B_'), sg.Button('Exit')]]

window = sg.Window('Toggle Button Example', layout)

down = True

while True:             # Event Loop
    event, values = window.Read()
    if event in (None, 'Exit'):
        break
    elif event == '_B_':
        down = not down
        window.Element('_B_').Update(('Off','On')[down], button_color=(('white', ('red', 'green')[down])))

window.Close()