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Changed multi-threaded demos to use new Window.write_event_value method

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This commit is contained in:
PySimpleGUI 2020-07-18 13:42:32 -04:00
parent 934cea5881
commit 04dfa364d5
6 changed files with 109 additions and 139 deletions
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25
DemoPrograms/Demo_Multithreaded_Write_Event_Value.py
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@ -1,20 +1,25 @@
import PySimpleGUI as sg
import threading
import time
import PySimpleGUI as sg
"""
Threaded Demo - Uses Window.write_event_value communications
Requires PySimpleGUI.py version 4.24.0.17
Demo of threads using a new way of communicating with threads that is done in a non-polled way.
No longer do you need to run your event loop with a timeout value in order to multi-thread.
Now you can pend on your read forever and use a special call that threads can call that will add a new item to the queue
of items
Requires PySimpleGUI.py version 4.25.0 and later
This is a really important demo to understand if you're going to be using multithreading in PySimpleGUI.
Older mechanisms for multi-threading in PySimpleGUI relied on polling of a queue. The management of a communications
queue is now performed internally to PySimpleGUI.
The importance of using the new window.write_event_value call cannot be emphasized enough. It will hav a HUGE impact, in
a positive way, on your code to move to this mechanism as your code will simply "pend" waiting for an event rather than polling.
Copyright 2020 PySimpleGUI.org
"""
THREAD_EVENT = '-THEAD-'
THREAD_EVENT = '-THREAD-'
def the_thread(window):
"""
@ -25,7 +30,8 @@ def the_thread(window):
i = 0
while True:
time.sleep(1)
window.write_event_value(THREAD_EVENT, i)
sg.cprint(f'thread info (in thread) = {threading.current_thread().name}', c='white on purple')
window.write_event_value('-THREAD-', i)
i += 1
@ -47,6 +53,7 @@ def main():
while True: # Event Loop
event, values = window.read()
sg.cprint(event, values)
sg.cprint(f'thread info = {threading.current_thread().name}')
if event == sg.WIN_CLOSED or event == 'Exit':
break
if event == 'Start':