53 lines
2.1 KiB
Python
53 lines
2.1 KiB
Python
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import PySimpleGUI as sg
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# import PySimpleGUIQt as sg
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# import PySimpleGUIWx as sg
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'''
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Event Callback Simulation
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This design pattern simulates callbacks for events.
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This is NOT the "normal" way things work in PySimpleGUI and is an architecture that is actively discouraged
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Unlike tkinter, Qt, etc, PySimpleGUI does not utilize callback
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functions as a mechanism for communicating when button presses or other events happen.
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BUT, should you want to quickly convert some existing code that does use callback functions, then this
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is one way to do a "quick and dirty" port to PySimpleGUI.
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'''
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# The callback functions
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# These callbacks all display a message in a non-blocking way and immediately return
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def button1(event, values):
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sg.popup_quick_message('Button 1 callback', background_color='red', text_color='white')
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def button2(event, values):
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sg.popup_quick_message('Button 2 callback', background_color='green', text_color='white')
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def catch_all(event, values):
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sg.popup_quick_message(f'An unplanned event = "{event}" happend', background_color='blue', text_color='white', auto_close_duration=6)
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# Lookup dictionary that maps event to function to call. In this case, only 2 event have defined callbacks
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func_dict = {'1':button1, '2':button2}
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# Layout the design of the GUI
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layout = [[sg.Text('Please click a button')],
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[sg.Button('1'), sg.Button('2'), sg.Button('Not defined', key='-MY-KEY-'), sg.Quit()]]
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# Show the Window to the user
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window = sg.Window('Button callback example', layout)
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# Event loop. Read buttons, make callbacks
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while True:
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# Read the Window
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event, values = window.read()
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# Lookup event in function dictionary and call the function, passing in the event and values variables
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try:
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func_dict[event](event, values) # Call function with event and values
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except:
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catch_all(event, values)
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# See if should close the window
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if event in ('Quit', None): # normally this is done IMMEDIATELY after the read
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break
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window.close()
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# All done!
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sg.popup_auto_close('Done... this window auto closes')
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