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Merge pull request #1410 from PySimpleGUI/Dev-latest 

Dev latest
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MikeTheWatchGuy 2019-05-14 20:59:55 -04:00 committed by GitHub
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1 changed files with 16 additions and 8 deletions
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24
DemoPrograms/Demo_Threaded_Work.py
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@ -19,6 +19,11 @@ import PySimpleGUI as sg
If you have multiple long tasks to run, then you'll want a more sophisticated If you have multiple long tasks to run, then you'll want a more sophisticated
format to your messages going back to the GUI so you'll know which task finished format to your messages going back to the GUI so you'll know which task finished
You want to look for 3 points in this code.
1. Where you put your call that takes a long time
2. Where the trigger to make the call takes place in the event loop
3. Where the completion of the call is indicated in the event loop
""" """
# Put your.... # Put your....
@ -29,7 +34,7 @@ import PySimpleGUI as sg
## ######## ## ## ## ######## ## ##
## ## ## ## ## ## ## ##
## ## ## ## ## ## ## ## ## ##
####### ## ####### ###### ## #######
#### ## ## ######## ######## ## ## ###### #### ## ## ######## #### ## ## ######## ######## ## ## ###### #### ## ## ########
## ### ## ## ## ### ## ## ## ## ## ## ## ## ### ## ## ## ### ## ## ## ## ## ## ##
@ -45,12 +50,13 @@ import PySimpleGUI as sg
## ## ## ## ## ###### ## ## ## ## ## ######
## ## ## ## ## ## ## ## ## ## ## ##
## ## ## ## ## ## ## ## ## ## ## ## ## ##
####### ####### ######## ######## ###### ####### ######## ########
# Here in this thread # Here in this thread
def worker_thread(thread_name, gui_queue): def worker_thread(thread_name, gui_queue):
print('Starting thread - {} '.format(thread_name)) print('Starting thread - {} '.format(thread_name))
# LOCATION 1
# this is our "long running function call" # this is our "long running function call"
time.sleep(5) # sleep for a while time.sleep(5) # sleep for a while
print('Ending thread - {} '.format(thread_name)) print('Ending thread - {} '.format(thread_name))
@ -68,12 +74,13 @@ def worker_thread(thread_name, gui_queue):
## ## ## ## ## ## ## ## ## ##
######## ######### #### ######## ######### ####
def the_gui(gui_queue): def the_gui():
gui_queue = queue.Queue() # queue used to communicate between the gui and the threads
layout = [[sg.Text('Multithreaded Work Example')], layout = [[sg.Text('Multithreaded Work Example')],
[sg.Text('', size=(25, 1), key='_OUTPUT_')], [sg.Text('', size=(25, 1), key='_OUTPUT_')],
# [sg.Output(size=(40,6))], # [sg.Output(size=(40,6))],
[sg.Button('Go'), sg.Button('Exit')], ] [sg.Button('Go'), sg.Button('Popup'), sg.Button('Exit')], ]
window = sg.Window('Multithreaded Window').Layout(layout) window = sg.Window('Multithreaded Window').Layout(layout)
# --------------------- EVENT LOOP --------------------- # --------------------- EVENT LOOP ---------------------
@ -84,6 +91,7 @@ def the_gui(gui_queue):
break break
if event == 'Go': # clicking "Go" starts a long running work item by starting thread if event == 'Go': # clicking "Go" starts a long running work item by starting thread
window.Element('_OUTPUT_').Update('Starting long work %s'%count) window.Element('_OUTPUT_').Update('Starting long work %s'%count)
# LOCATION 2
# STARTING long run by starting a thread # STARTING long run by starting a thread
threading.Thread(target=worker_thread, args=('Thread %s'%count, gui_queue,), daemon=True).start() threading.Thread(target=worker_thread, args=('Thread %s'%count, gui_queue,), daemon=True).start()
count += 1 count += 1
@ -95,10 +103,12 @@ def the_gui(gui_queue):
# if message received from queue, display the message in the Window # if message received from queue, display the message in the Window
if message is not None: if message is not None:
# LOCATION 3
# this is the place you would execute code at ENDING of long running task # this is the place you would execute code at ENDING of long running task
window.Element('_OUTPUT_').Update(message) window.Element('_OUTPUT_').Update(message)
window.Refresh() # do a refresh because could be showing multiple messages before next Read
if event == 'Popup':
sg.Popup('This is a popup showing that the GUI is running')
# if user exits the window, then close the window and exit the GUI func # if user exits the window, then close the window and exit the GUI func
window.Close() window.Close()
@ -112,7 +122,5 @@ def the_gui(gui_queue):
## ## ## ## #### ## ## ## ## ## ## #### ## ##
if __name__ == '__main__': if __name__ == '__main__':
# -- Create a Queue to communicate with GUI -- the_gui()
gui_queue = queue.Queue() # queue used to communicate between the gui and the threads
the_gui(gui_queue)
print('Exiting Program') print('Exiting Program')