import time
import PySimpleGUI as sg
"""
Demo Long Operations
How to make calls to your functions that take a very long time to complete.
One of the classic GUI problems is when a function takes a long time to complete.
Normally these functions cause a GUI to appear to the operating system to have
hung and you'll see a message asking if you want to kill your program.
PySimpleGUI has a Window method - perform_long_operation that can help in these situations
NOTE - because this method uses threads, it's important you do not make any PySimpleGUI calls
from your long function. Also, some things simply cannot be safely run as a thread. Just understand
that this function perform_long_operation utilizes threads.
window.perform_long_operation takes 2 parameters:
* A lambda expression that represents your function call
* A key that is returned when you function completes
When you function completes, you will receive an event when calling window.read() that
matches the key provided.
Copyright 2021 PySimpleGUI
"""
'''
M""MMMMM""M
M MMMMM M
M MMMMM M .d8888b. .d8888b. 88d888b.
M MMMMM M Y8ooooo. 88ooood8 88' `88
M `MMM' M 88 88. ... 88
Mb dM `88888P' `88888P' dP
MMMMMMMMMMM
MM""""""""`M
MM mmmmmmmM
M' MMMM dP dP 88d888b. .d8888b.
MM MMMMMMMM 88 88 88' `88 88' `""
MM MMMMMMMM 88. .88 88 88 88. ...
MM MMMMMMMM `88888P' dP dP `88888P'
MMMMMMMMMMMM
'''
def my_long_func(count, a=1, b=2):
"""
This is your function that takes a long time
:param count:
:param a:
:param b:
:return:
"""
for i in range(count):
print(i, a, b)
time.sleep(.5)
return 'DONE!'
'''
oo
88d8b.d8b. .d8888b. dP 88d888b.
88'`88'`88 88' `88 88 88' `88
88 88 88 88. .88 88 88 88
dP dP dP `88888P8 dP dP dP
oo dP oo dP dP dP
88 88 88 88
dP 88d888b. .d888b88 dP 88d888b. .d8888b. .d8888b. d8888P .d8888b. .d8888b. 88 88
88 88' `88 88' `88 88 88' `88 88ooood8 88' `"" 88 88' `"" 88' `88 88 88
88 88 88 88. .88 88 88 88. ... 88. ... 88 88. ... 88. .88 88 88
dP dP dP `88888P8 dP dP `88888P' `88888P' dP `88888P' `88888P8 dP dP
'''
# This is your new code that uses a thread to perform the long operation
def main():
layout = [ [sg.Text('Indirect Call Version')],
[sg.Text('How many times to run the loop?'), sg.Input(s=(4,1), key='-IN-')],
[sg.Text(s=(30,1), k='-STATUS-')],
[sg.Button('Go', bind_return_key=True), sg.Button('Exit')] ]
window = sg.Window('Window Title', layout)
while True: # Event Loop
event, values = window.read()
print(event, values)
if event == sg.WIN_CLOSED or event == 'Exit':
break
elif event == 'Go':
window['-STATUS-'].update('Calling your function...')
if values['-IN-'].isnumeric():
# This is where the magic happens. Add your function call as a lambda
window.perform_long_operation(lambda :
my_long_func(int(values['-IN-']), a=10),
'-END KEY-')
else:
window['-STATUS-'].update('Try again... how about an int?')
elif event == '-END KEY-':
return_value = values[event]
window['-STATUS-'].update(f'Completed. Returned: {return_value}')
window.close()
'''
oo
88d8b.d8b. .d8888b. dP 88d888b.
88'`88'`88 88' `88 88 88' `88
88 88 88 88. .88 88 88 88
dP dP dP `88888P8 dP dP dP
dP oo dP dP dP
88 88 88 88
.d888b88 dP 88d888b. .d8888b. .d8888b. d8888P .d8888b. .d8888b. 88 88
88' `88 88 88' `88 88ooood8 88' `"" 88 88' `"" 88' `88 88 88
88. .88 88 88 88. ... 88. ... 88 88. ... 88. .88 88 88
`88888P8 dP dP `88888P' `88888P' dP `88888P' `88888P8 dP dP
'''
# This is your original code... it's all going great.... until the call takes too long
def old_main():
layout = [ [sg.Text('Direct Call Version')],
[sg.Text('How many times to run the loop?'), sg.Input(s=(4,1), key='-IN-')],
[sg.Text(s=(30,1), k='-STATUS-')],
[sg.Button('Go', bind_return_key=True), sg.Button('Exit')] ]
window = sg.Window('Window Title', layout)
while True: # Event Loop
event, values = window.read()
print(event, values)
if event == sg.WIN_CLOSED or event == 'Exit':
break
elif event == 'Go':
if values['-IN-'].isnumeric():
window['-STATUS-'].update('Calling your function...')
window.refresh() # needed to make the message show up immediately20
return_value = my_long_func(int(values['-IN-']), a=10)
window['-STATUS-'].update(f'Completed. Returned: {return_value}')
else:
window['-STATUS-'].update('Try again... how about an int?')
window.close()
if __name__ == '__main__':
# old_main()
main()