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New Demo Program - a multi-threaded example using a queue to send data to your application

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PySimpleGUI 2022-11-12 11:02:09 -05:00
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DemoPrograms/Demo_Multithreaded_DataPump.py Normal file
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import PySimpleGUI as sg
import random
import time
import queue
"""
Demo - Multi-threaded "Data Pump" Design Pattern
Send data to your PySimpleGUI program through a Python Queue, enabling integration with many
different types of data sources.
A thread gets data from a queue object and passes it over to the main event loop.
The external_thread is only used here to generaate random data. It's not part of the
overall "Design Pattern".
The thread the_thread IS part of the design pattern. It reads data from the thread_queue and sends that
data over to the PySimpleGUI event loop.
Copyright 2022 PySimpleGUI
"""
gsize = (400, 400) # size of the graph
THREAD_KEY = '-THREAD-'
THREAD_INCOMING_DATA = '-INCOMING DATA-'
THREAD_EXITNG = '-THREAD EXITING-'
THREAD_EXTERNAL_EXITNG = '-EXTERNAL THREAD EXITING-'
# This queue is where you will send your data that you want to eventually arrive as an event
thread_queue = queue.Queue()
# M""""""""M dP dP
# Mmmm mmmM 88 88
# MMMM MMMM 88d888b. 88d888b. .d8888b. .d8888b. .d888b88
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# MMMM MMMM 88 88 88 88. ... 88. .88 88. .88
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# MMMMMMMMMM
#
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# M. .MMM' M 88 88 88 88 88. .88 88 88. .88 88 88 88 88 88. .88
# Mb. .dM dP dP dP dP `88888P' dP `88888P8 dP dP dP dP `8888P88
# MMMMMMMMMMM .88
# d8888P
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# M mmmm. `M 88 M mmmmm..M
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# M MMMMM M 88' `88 88 88' `88 MMMMMMM. M 88' `88 88 88 88' `88 88' `"" 88ooood8
# M MMMM' .M 88. .88 88 88. .88 M. .MMM' M 88. .88 88. .88 88 88. ... 88. ...
# M .MM `88888P8 dP `88888P8 Mb. .dM `88888P' `88888P' dP `88888P' `88888P'
# MMMMMMMMMMM MMMMMMMMMMM
#
def external_thread(thread_queue:queue.Queue):
"""
Represents some external source of data.
You would not include this code as a starting point with this Demo Program. Your data is assumed to
come from somewhere else. The important part is that you add data to the thread_queue
:param thread_queue:
:return:
"""
i = 0
while True:
time.sleep(.01)
point = (random.randint(0,gsize[0]), random.randint(0,gsize[1]))
radius = random.randint(10, 40)
thread_queue.put((point, radius))
i += 1
# M""""""""M dP dP MM""""""""`M
# Mmmm mmmM 88 88 MM mmmmmmmM
# MMMM MMMM 88d888b. 88d888b. .d8888b. .d8888b. .d888b88 M' MMMM .d8888b. 88d888b.
# MMMM MMMM 88' `88 88' `88 88ooood8 88' `88 88' `88 MM MMMMMMMM 88' `88 88' `88
# MMMM MMMM 88 88 88 88. ... 88. .88 88. .88 MM MMMMMMMM 88. .88 88
# MMMM MMMM dP dP dP `88888P' `88888P8 `88888P8 MM MMMMMMMM `88888P' dP
# MMMMMMMMMM MMMMMMMMMMMM
#
# MM"""""""`YM MP""""""`MM MM'"""""`MM MM""""""""`M dP
# MM mmmmm M M mmmmm..M M' .mmm. `M MM mmmmmmmM 88
# M' .M M. `YM M MMMMMMMM M` MMMM dP .dP .d8888b. 88d888b. d8888P .d8888b.
# MM MMMMMMMM MMMMMMM. M M MMM `M MM MMMMMMMM 88 d8' 88ooood8 88' `88 88 Y8ooooo.
# MM MMMMMMMM M. .MMM' M M. `MMM' .M MM MMMMMMMM 88 .88' 88. ... 88 88 88 88
# MM MMMMMMMM Mb. .dM MM. .MM MM .M 8888P' `88888P' dP dP dP `88888P'
# MMMMMMMMMMMM MMMMMMMMMMM MMMMMMMMMMM MMMMMMMMMMMM
def the_thread(window:sg.Window, thread_queue:queue.Queue):
"""
The thread that communicates with the application through the window's events.
Waits for data from a queue and sends that data on to the event loop
:param window:
:param thread_queue:
:return:
"""
while True:
data = thread_queue.get()
window.write_event_value((THREAD_KEY, THREAD_INCOMING_DATA), data) # Data sent is a tuple of thread name and counter
def main():
layout = [ [sg.Text('My Simulated Data Pump')],
[sg.Multiline(size=(60, 20), k='-MLINE-')],
[sg.Graph(gsize, (0, 0), gsize, k='-G-', background_color='gray')],
[sg.Button('Go'), sg.Button('Exit')] ]
window = sg.Window('Simulated Data Pump', layout, right_click_menu=sg.MENU_RIGHT_CLICK_EDITME_VER_EXIT)
graph = window['-G-'] # type: sg.Graph
while True: # Event Loop
event, values = window.read()
# print(event, values)
if event == sg.WIN_CLOSED or event == 'Exit':
break
if event == 'Go':
window.start_thread(lambda: the_thread(window, thread_queue), (THREAD_KEY, THREAD_EXITNG))
window.start_thread(lambda: external_thread(thread_queue), (THREAD_KEY, THREAD_EXTERNAL_EXITNG))
# Events coming from the Thread
elif event[0] == THREAD_KEY:
if event[1] == THREAD_INCOMING_DATA:
point, radius = values[event]
graph.draw_circle(point, radius=radius, fill_color='green')
window['-MLINE-'].print(f'Drawing at {point} radius {radius}', c='white on red')
elif event[1] == THREAD_EXITNG:
window['-MLINE-'].print('Thread has exited')
elif event[1] == THREAD_EXTERNAL_EXITNG:
window['-MLINE-'].print('Data Pump thread has exited')
if event == 'Edit Me':
sg.execute_editor(__file__)
elif event == 'Version':
sg.popup_scrolled(__file__, sg.get_versions(), location=window.current_location(), keep_on_top=True, non_blocking=True)
window.close()
if __name__ == '__main__':
main()