69 lines
2.3 KiB
Python
69 lines
2.3 KiB
Python
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import threading
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import time
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import PySimpleGUI as sg
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"""
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Threaded Demo - Uses Window.write_event_value to communicate from thread to GUI
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A demo specifically to show how to use write_event_value to
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"show a popup from a thread"
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You cannot make any direct calls into PySimpleGUI from a thread
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except for Window.write_event_value()
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Cuation - This method still has a risk of tkinter crashing
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Copyright 2021 PySimpleGUI
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"""
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def the_thread(window:sg.Window, seconds):
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"""
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The thread that communicates with the application through the window's events.
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Wakes every X seconds that are provided by user in the main GUI:
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Sends an event to the main thread
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Goes back to sleep
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"""
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i = 0
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while True:
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time.sleep(seconds)
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# send a message to the main GUI. It will be read using window.read()
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# the "Value" send is a tuple that contains all the things to show in the popup
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window.write_event_value('-POPUP-',
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('Hello this is the thread...',
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f'My counter is {i}',
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f'Will send another message in {seconds} seconds'))
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i += 1
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def main():
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"""
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Every time "Start A Thread" is clicked a new thread is started
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When the event is received from the thread, a popup is shown in its behalf
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"""
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layout = [ [sg.Output(size=(60,10))],
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[sg.T('How often a thread will show a popup in seconds'),
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sg.Spin((2, 5, 10, 20), initial_value=5, k='-SPIN-')],
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[sg.B('Start A Thread'), sg.B('Dummy'), sg.Button('Exit')] ]
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window = sg.Window('Window Title', layout, finalize=True, font='_ 15')
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while True: # Event Loop
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event, values = window.read()
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print(event, values)
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if event == sg.WIN_CLOSED or event == 'Exit':
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break
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if event == '-POPUP-':
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sg.popup_non_blocking('This is a popup that the thread wants to show',
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*values['-POPUP-'])
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elif event == 'Start A Thread':
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print(f'Starting thread. You will see a new popup every {values["-SPIN-"]} seconds')
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threading.Thread(target=the_thread, args=(window, values['-SPIN-']), daemon=True).start()
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window.close()
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if __name__ == '__main__':
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main()
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