"""
    PySimpleGUI The Complete Course
    Lesson 7 - Multiple Windows
"""
import PySimpleGUI as sg

# Design pattern 1 - First window does not remain active

layout = [[ sg.Text('Window 1'),],
          [sg.Input(do_not_clear=True)],
          [sg.Text('', size=(20,1), key='_OUTPUT_')],
          [sg.Button('Launch 2')]]

win1 = sg.Window('Window 1').Layout(layout)
win2_active=False
while True:
    ev1, vals1 = win1.Read(timeout=100)
    if ev1 is None:
        break
    win1.FindElement('_OUTPUT_').Update(vals1[0])

    if ev1 == 'Launch 2' and not win2_active:
        win2_active = True
        win1.Hide()
        layout2 = [[sg.Text('Window 2')],
                   [sg.Button('Exit')]]

        win2 = sg.Window('Window 2').Layout(layout2)
        while True:
            ev2, vals2 = win2.Read()
            if ev2 is None or ev2 == 'Exit':
                win2.Close()
                win2_active = False
                win1.UnHide()
                break