94 lines
2.4 KiB
Python
94 lines
2.4 KiB
Python
import PySimpleGUI as sg
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import queue
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import logging
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import threading
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import time
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"""
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This code originated in this project:
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https://github.com/john144/MultiThreading
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Thanks to John for writing this in the early days of PySimpleGUI
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Demo program showing one way that a threaded application can function with PySimpleGUI
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Events are sent from the ThreadedApp thread to the main thread, the GUI, by using a queue
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"""
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logger = logging.getLogger('mymain')
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def externalFunction():
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logger.info('Hello from external app')
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logger.info('External app sleeping 5 seconds')
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time.sleep(5)
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logger.info('External app waking up and exiting')
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class ThreadedApp(threading.Thread):
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def __init__(self):
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super().__init__()
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self._stop_event = threading.Event()
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def run(self):
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externalFunction()
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def stop(self):
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self._stop_event.set()
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class QueueHandler(logging.Handler):
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def __init__(self, log_queue):
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super().__init__()
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self.log_queue = log_queue
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def emit(self, record):
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self.log_queue.put(record)
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def main():
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layout = [
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[sg.Multiline(size=(50, 15), key='-LOG-')],
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[sg.Button('Start', bind_return_key=True, key='-START-'), sg.Button('Exit')]
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]
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window = sg.Window('Log window', layout,
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default_element_size=(30, 2),
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font=('Helvetica', ' 10'),
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default_button_element_size=(8, 2),)
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appStarted = False
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# Setup logging and start app
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logging.basicConfig(level=logging.DEBUG)
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log_queue = queue.Queue()
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queue_handler = QueueHandler(log_queue)
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logger.addHandler(queue_handler)
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threadedApp = ThreadedApp()
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# Loop taking in user input and querying queue
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while True:
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# Wake every 100ms and look for work
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event, values = window.read(timeout=100)
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if event == '-START-':
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if appStarted is False:
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threadedApp.start()
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logger.debug('App started')
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window['-START-'].update(disabled=True)
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appStarted = True
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elif event in (None, 'Exit'):
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break
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# Poll queue
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try:
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record = log_queue.get(block=False)
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except queue.Empty:
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pass
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else:
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msg = queue_handler.format(record)
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window['-LOG-'].update(msg+'\n', append=True)
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window.close()
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if __name__ == '__main__':
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main() |