87 lines
3.7 KiB
Python
87 lines
3.7 KiB
Python
import PySimpleGUI as sg
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import random
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import time
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"""
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Demo - Multi-threaded downloader with one_line_progress_meter
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Sometimes you don't have a choice in how your data is downloaded. In some programs
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the download happens in another thread which means you cannot call PySimpleGUI directly
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from the thread.
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Maybe you're still interested in using the one_line_progress_meter feature or perhaps
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have implemented your own progress meter in your window.
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Using the write_event_value method enables you to easily do either of these.
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In this demo, all thread events are a TUPLE with the first item in tuple being THREAD_KEY ---> '-THEAD-'
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This allows easy separation of all of the thread-based keys into 1 if statment:
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elif event[0] == THREAD_KEY:
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Example
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(THREAD_KEY, DL_START_KEY) indicates the download is starting and provices the Max value
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(THREAD_KEY, DL_END_KEY) indicates the downloading has completed
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The main window uses a relative location when making the window so that the one-line-progress-meter has room
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Copyright 2021, 2022 PySimpleGUI
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"""
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THREAD_KEY = '-THREAD-'
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DL_START_KEY = '-START DOWNLOAD-'
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DL_COUNT_KEY = '-COUNT-'
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DL_END_KEY = '-END DOWNLOAD-'
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DL_THREAD_EXITNG = '-THREAD EXITING-'
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def the_thread(window:sg.Window):
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"""
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The thread that communicates with the application through the window's events.
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Simulates downloading a random number of chinks from 50 to 100-
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"""
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max_value = random.randint(50, 100)
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window.write_event_value((THREAD_KEY, DL_START_KEY), max_value) # Data sent is a tuple of thread name and counter
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for i in range(max_value):
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time.sleep(.1)
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window.write_event_value((THREAD_KEY, DL_COUNT_KEY), i) # Data sent is a tuple of thread name and counter
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window.write_event_value((THREAD_KEY, DL_END_KEY), max_value) # Data sent is a tuple of thread name and counter
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def main():
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layout = [ [sg.Text('My Multi-threaded PySimpleGUI Program')],
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[sg.ProgressBar(100, 'h', size=(30,20), k='-PROGRESS-', expand_x=True)],
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[sg.Text(key='-STATUS-')],
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[sg.Button('Go'), sg.Button('Exit')] ]
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window = sg.Window('Window Title', layout, finalize=True, relative_location=(0, -300))
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downloading, max_value = False, 0
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while True: # Event Loop
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event, values = window.read()
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# print(event, values)
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if event == sg.WIN_CLOSED or event == 'Exit':
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break
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if event == 'Go' and not downloading:
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window.start_thread(lambda: the_thread(window), (THREAD_KEY, DL_THREAD_EXITNG))
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# Events coming from the Thread
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elif event[0] == THREAD_KEY:
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if event[1] == DL_START_KEY:
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max_value = values[event]
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downloading = True
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window['-STATUS-'].update('Starting download')
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sg.one_line_progress_meter(f'Downloading {max_value} segments', 0, max_value, 1, f'Downloading {max_value} segments', )
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window['-PROGRESS-'].update(0, max_value)
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elif event[1] == DL_COUNT_KEY:
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sg.one_line_progress_meter(f'Downloading {max_value} segments', values[event]+1, max_value, 1, f'Downloading {max_value} segments')
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window['-STATUS-'].update(f'Got a new current count update {values[event]}')
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window['-PROGRESS-'].update(values[event]+1, max_value)
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elif event[1] == DL_END_KEY:
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downloading = False
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window['-STATUS-'].update('Download finished')
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elif event[1] == DL_THREAD_EXITNG:
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window['-STATUS-'].update('Last step - Thread has exited')
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window.close()
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if __name__ == '__main__':
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main()
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