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Merge pull request #4540 from PySimpleGUI/Dev-latest 

Updated to include a before/after as an easier to follow example
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PySimpleGUI 2021-07-22 16:13:22 -04:00 committed by GitHub
parent 91913a3ad9 f1c66feadb
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86
DemoPrograms/Demo_Multithreaded_Wrapper_Func.py
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@ -14,6 +14,13 @@ import PySimpleGUI as sg
the window that will receive the results and a key that is used to signal that the function
has completed running.
The overall idea here is you can directly call your function until it gets too lengthy for
the GUI to remain reasonably responsive. When you get to the point the function takes too long, then
you'll copy and paste your function call into the call to perform_long_operation. The function looks
identical to your original code, except that it's now a parameter to another function and the
return value is passed back to you later.
Copyright 2021 PySimpleGUI
"""
@ -71,17 +78,26 @@ def my_long_func(count, a=1, b=2):
'''
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'''
# This is your new code that uses a thread to perform the long operation
def main():
layout = [ [sg.Text('Long running function call design pattern')],
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')] ]
@ -96,14 +112,66 @@ def main():
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
perform_long_operation(lambda : my_long_func(int(values['-IN-']), a=10),
window, '-END KEY-')
perform_long_operation(
lambda : my_long_func(int(values['-IN-']), a=10),
window, '-END KEY-')
else:
window['-STATUS-'].update('Try again... how about an int?')
elif event == '-END KEY-':
window['-STATUS-'].update(f'Completed. Returned: {values[event]}')
window.close()
'''
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'''
# 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()