PySimpleGUI/DemoPrograms/Demo_Design_Pattern_Multipl...

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import PySimpleGUI as sg
"""
Design pattern multiple windows
Using read_all_windows()
Only 1 window at a time is visible/active on the screen.
Window1 opens Window2
When Window2 closes, Window1 reappears
Program exits when Window1 is closed
Copyright 2020 PySimpleGUI.org
"""
def make_window1():
layout = [[sg.Text('Window 1'), ],
[sg.Input(key='-IN-')],
[sg.Text(size=(20, 1), key='-OUTPUT-')],
[sg.Button('Launch 2'), sg.Button('Output')]]
return sg.Window('Window 1', layout, finalize=True)
def make_window2():
layout = [[sg.Text('Window 2')],
[sg.Button('Exit')]]
return sg.Window('Window 2', layout, finalize=True)
def main():
# Design pattern 1 - First window does not remain active
window2 = None
window1 = make_window1()
while True:
window, event, values = sg.read_all_windows()
if event == sg.WIN_CLOSED and window == window1:
break
if window == window1:
window1['-OUTPUT-'].update(values['-IN-'])
if event == 'Launch 2' and not window2:
window1.hide()
window2 = make_window2()
if window == window2 and (event in (sg.WIN_CLOSED, 'Exit')):
window2.close()
window2 = None
window1.un_hide()
window1.close()
if __name__ == '__main__':
main()