83 lines
2.7 KiB
Python
83 lines
2.7 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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import queue
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"""
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Threading Demo - "Call popup from a thread"
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Can be extended to call any PySimpleGUI function by passing the function through the queue
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Safest approach to threading is to use a Queue object to communicate
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between threads and maintrhead.
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The thread calls popup, a LOCAL function that should be called with the same
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parameters that would be used to call opiup when called directly
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The parameters passed to the local popup are passed through a queue to the main thread.
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When a messages is received from the queue, sg.popup is called using the parms passed
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through the queue
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Copyright 2021 PySimpleGUI.org
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"""
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mainthread_queue:queue.Queue = None
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def popup(*args, **kwargs):
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if mainthread_queue:
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mainthread_queue.put((args, kwargs))
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def the_thread():
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"""
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The thread that communicates with the application through the window's events.
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Once a second wakes and sends a new event and associated value to the window
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"""
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i = 0
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while True:
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time.sleep(2)
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popup('Hello, this is the thread', 'My counter value', i, text_color='white', background_color='red', non_blocking=True)
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i += 1
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def process_popup():
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try:
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queued_value = mainthread_queue.get_nowait()
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sg.popup_auto_close(*queued_value[0], **queued_value[1])
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except queue.Empty: # get_nowait() will get exception when Queue is empty
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pass
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def main():
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"""
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The demo will display in the multiline info about the event and values dictionary as it is being
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returned from window.read()
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Every time "Start" is clicked a new thread is started
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Try clicking "Dummy" to see that the window is active while the thread stuff is happening in the background
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"""
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global mainthread_queue
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mainthread_queue = queue.Queue()
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layout = [ [sg.Text('Output Area - cprint\'s route to here', font='Any 15')],
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[sg.Multiline(size=(65,20), key='-ML-', autoscroll=True, reroute_stdout=True, write_only=True, reroute_cprint=True)],
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[sg.T('Input so you can see data in your dictionary')],
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[sg.Input(key='-IN-', size=(30,1))],
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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)
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while True: # Event Loop
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event, values = window.read(timeout=500)
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sg.cprint(event, values) if event != sg.TIMEOUT_EVENT else None
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if event == sg.WIN_CLOSED or event == 'Exit':
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break
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process_popup()
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if event.startswith('Start'):
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threading.Thread(target=the_thread, 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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