PySimpleGUI/DemoPrograms/Demo_NonBlocking_Form.py

#!/usr/bin/env python
import sys
if sys.version_info[0] >= 3:
    import PySimpleGUI as sg
else:
    import PySimpleGUI27 as sg
import time

# Window that doen't block
# good for applications with an loop that polls hardware
def StatusOutputExample():
    # Create a text element that will be updated with status information on the GUI itself
    # Create the rows
    layout = [[sg.Text('Non-blocking GUI with updates')],
                 [sg.Text('', size=(8, 2), font=('Helvetica', 20), justification='center', key='output')],
                 [sg.Button('LED On'), sg.Button('LED Off'), sg.Button('Quit')]]
    # Layout the rows of the Window and perform a read. Indicate the Window is non-blocking!
    window = sg.Window('Running Timer', auto_size_text=True).Layout(layout)

    #
    # Some place later in your code...
    # You need to perform a Read on your window every now and then or
    # else it won't refresh.
    #
    # your program's main loop
    i=0
    while (True):
        # This is the code that reads and updates your window
        event, values = window.Read(timeout=10)
        window.FindElement('output').Update('{:02d}:{:02d}.{:02d}'.format((i // 100) // 60, (i // 100) % 60, i % 100))
        if event == 'Quit' or event is None:
            break
        if event == 'LED On':
            print('Turning on the LED')
        elif event == 'LED Off':
            print('Turning off the LED')

        i += 1
        # Your code begins here

    # Broke out of main loop. Close the window.
    window.Close()


def RemoteControlExample():

    layout = [[sg.Text('Robotics Remote Control')],
                 [sg.T(' '*10), sg.RealtimeButton('Forward')],
                 [ sg.RealtimeButton('Left'), sg.T(' '*15), sg.RealtimeButton('Right')],
                 [sg.T(' '*10), sg.RealtimeButton('Reverse')],
                 [sg.T('')],
                 [sg.Quit(button_color=('black', 'orange'))]
                 ]

    window = sg.Window('Robotics Remote Control', auto_size_text=True).Layout(layout).Finalize()

    #
    # Some place later in your code...
    # You need to perform a ReadNonBlocking on your window every now and then or
    # else it won't refresh.
    #
    # your program's main loop
    while (True):
        # This is the code that reads and updates your window
        event, values = window.Read(timeout=0, timeout_key='timeout')
        if event is not 'timeout':
            print(event)
        if event == 'Quit' or event is None:
            break

    window.Close()


def main():
    RemoteControlExample()
    StatusOutputExample()
    sg.Popup('End of non-blocking demonstration')


if __name__ == '__main__':

    main()