71 lines
2.5 KiB
Python
71 lines
2.5 KiB
Python
from queue import Queue
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from threading import Thread
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from time import sleep
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import PySimpleGUI as sg
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"""
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DESIGN PATTERN - Multithreaded GUI
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One method for running multiple threads in a PySimpleGUI environment.
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This design pattern works for all of the flavors of PySimpleGUI including the Web and also repl.it
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"""
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def worker_thread(thread_name, run_freq, gui_queue):
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"""
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A worker thrread that communicates with the GUI
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These threads can call functions that block withouth affecting the GUI (a good thing)
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:param thread_name: Text name used for displaying info
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:param run_freq: How often the thread should run in milliseconds
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:param gui_queue: Queue used to communicate with the GUI
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:return:
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"""
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print('Strarting thread - ', thread_name)
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i = 0
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while True:
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sleep(run_freq/1000)
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gui_queue.put('{} - {}'.format(thread_name, i))
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i += 1
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def the_gui(gui_queue):
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"""
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starts and executes the GUI. Returns when the user exits / closes the window
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reads data from a Queue and displays the data
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:param gui_queue: Queue the GUI should read from
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:return:
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"""
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layout = [ [sg.Text('Your GUI Window')],
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[sg.Text('', size=(15,1), key='_OUTPUT_')],
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[sg.Button('Exit')],]
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window = sg.Window('Window Title').Layout(layout)
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while True: # Event Loop
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event, values = window.Read(timeout=200) # wait for up to 200 ms for a GUI event
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if event is None or event == 'Exit':
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break
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#--------------- Handle stuff coming in from threads ---------------
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try: # see if something has been posted to Queue
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message = gui_queue.get_nowait()
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except:
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message = None # indicate nothing posted
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# if message received from queue, display the message in the Window
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if message:
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window.Element('_OUTPUT_').Update(message)
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# if user exits the window, then close the window and exit
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window.Close()
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if __name__ == '__main__':
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#-- Create a Queue to communicate with GUI --
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gui_queue = Queue() # queue used to communicate between the gui and the worker
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#-- Start worker threads, one runs twice as often as the other
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thread = Thread(target=worker_thread, args=('Thread 1', 1000, gui_queue,), daemon=True)
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thread.start()
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thread = Thread(target=worker_thread, args=('Thread 2', 500, gui_queue,), daemon=True)
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thread.start()
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#-- Start the GUI passing in the Queue --
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the_gui(gui_queue)
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