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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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20
DemoPrograms/Demo_Multithreaded_Multiple_Threads.py
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@ -1,5 +1,4 @@
#!/usr/bin/python3
import queue
import threading
import time
import PySimpleGUI as sg
@ -41,13 +40,13 @@ import PySimpleGUI as sg
# Create one of these functions for EVERY long-running call you want to make
def long_function_wrapper(work_id, gui_queue):
def long_function_wrapper(work_id, window):
# LOCATION 1
# this is our "long running function call"
# sleep for a while as a simulation of a long-running computation
time.sleep(5)
# at the end of the work, before exiting, send a message back to the GUI indicating end
gui_queue.put('{} ::: done'.format(work_id))
window.write_event_value('-THREAD DONE-', work_id)
# at this point, the thread exits
return
@ -56,8 +55,6 @@ def long_function_wrapper(work_id, gui_queue):
def the_gui():
sg.theme('Light Brown 3')
# queue used to communicate between the gui and long-running code
gui_queue = queue.Queue()
layout = [[sg.Text('Multithreaded Work Example')],
[sg.Text('Click Go to start a long-running function call')],
@ -71,7 +68,7 @@ def the_gui():
work_id = 0
while True:
# wait for up to 100 ms for a GUI event
event, values = window.read(timeout=100)
event, values = window.read()
if event in (sg.WIN_CLOSED, 'Exit'):
break
if event == 'Go': # clicking "Go" starts a long running work item by starting thread
@ -81,23 +78,18 @@ def the_gui():
# STARTING long run by starting a thread
thread_id = threading.Thread(
target=long_function_wrapper,
args=(work_id, gui_queue,),
args=(work_id, window,),
daemon=True)
thread_id.start()
work_id = work_id+1 if work_id < 19 else 0
# --------------- Read next message coming in from threads ---------------
try:
message = gui_queue.get_nowait() # see if something has been posted to Queue
except queue.Empty: # get_nowait() will get exception when Queue is empty
message = None # nothing in queue so do nothing
# if message received from queue, then some work was completed
if message is not None:
if event == '-THREAD DONE-':
# LOCATION 3
# this is the place you would execute code at ENDING of long running task
# You can check the completed_work_id variable
# to see exactly which long-running function completed
completed_work_id = int(message[:message.index(' :::')])
completed_work_id = values[event]
window['-OUTPUT2-'].update(
'Complete Work ID "{}"'.format(completed_work_id))
window[completed_work_id].update(text_color='green')