A Next/Previoius design patttern

DemoPrograms/Demo_Design_Pattern_Multiple_Windows3.py

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+import PySimpleGUI as sg
+
+layout = [[ sg.Text('Window 1'),],
+         [sg.Input(do_not_clear=True)],
+         [sg.Text('', key='_OUTPUT_')],
+         [sg.Button('Next >'), sg.Button('Exit')]]
+
+win1 = sg.Window('Window 1').Layout(layout)
+
+win3_active = win2_active = False
+while True:
+   ev1, vals1 = win1.Read(timeout=100)
+   if ev1 is None or ev1 == 'Exit':
+       break
+   win1.FindElement('_OUTPUT_').Update(vals1[0])
+
+   if not win2_active and ev1 == 'Next >':
+       win2_active = True
+       win1.Hide()
+       layout2 = [[sg.Text('Window 2')],
+                  [sg.Button('< Prev'), sg.Button('Next >')]]
+
+       win2 = sg.Window('Window 2').Layout(layout2)
+
+   if win2_active:
+       ev2, vals2 = win2.Read()
+       if ev2 in (None, 'Exit', '< Prev'):
+           win2_active  = False
+           win2.Close()
+           win1.UnHide()
+       elif ev2 == 'Next >':
+           win3_active = True
+           win2_active = False
+           win2.Hide()
+           layout3 = [[sg.Text('Window 3')],
+                      [sg.Button('< Prev'), sg.Button('Exit')]]
+           win3 = sg.Window('Window 3').Layout(layout3)
+
+   if win3_active:
+       ev3, vals3 = win3.Read()
+       if ev3 in (None, 'Exit', '< Prev'):
+           win3.Close()
+           win3_active  = False
+           win2_active  = True
+           win2.UnHide()