Dynamically Updating an Element in a Multiple Window Setup

Question

I have a quick question about updating fields dynamically in a multiple window setup such as the example above. I want it so that when the user selects autofill, values[SAVEINVENTORYPATH] is printed to the 'testinputtext' field in the settings window however when I use window.update, it searches for the keys in the main window rather than the settings window. How can I direct PySimpleGUI towards the settings window?

EDIT: Thank you for your help, I have edited the code and the autofill function works however currently, Autofill appears to freeze the window but I want people to be able to select Autofill and then hit Save and then the Settings window refreshes however I'm not sure where to currently place the while True loop. Thank you again for your assistance with this.

def create_settings_window(settings):
   sg.theme('LightGrey6')
   settings = load_settings(SETTINGS_FILE, DEFAULT_SETTINGS )
   def TextLabel(text): return sg.Text(text+':', justification='r', size=(20,1))


   layout = [  [sg.Text('Set Up Connection', font='Any 15')],
            [TextLabel('Inventory List'), sg.Input(key='SAVEINVENTORYPATH'), sg.FileBrowse(key='INVENTORYLIST')],
            [sg.Text(text='', key = 'testinputtext')],
            [sg.Button('Save'), sg.Button('Autofill'), sg.Button('Exit')]  ]

   window = sg.Window('Settings', layout, keep_on_top=True, finalize=True,element_padding = (3,3.5))

   test = window['testinputtext']
   event, values = window.read()

   if event == 'Autofill':
      test.update(value = 'hi')

   if event == 'Save':
      save_settings(SETTINGS_FILE, settings, values)
      sg.popup('Settings saved')
  else:
    print(event, values)

   for key in SETTINGS_KEYS_TO_ELEMENT_KEYS:  
    try:
        window[SETTINGS_KEYS_TO_ELEMENT_KEYS[key]].update(value=settings[key])
    except Exception as e:
        print(f'Problem updating PySimpleGUI window from settings. Key = {key}')
    
return window

def main():
  window, settings = None, load_settings(SETTINGS_FILE, DEFAULT_SETTINGS )
  while True:             # Event Loop
    #LAYOUT
    if window is None:
        settings = load_settings(SETTINGS_FILE, DEFAULT_SETTINGS )
        sg.theme('LightGrey6')
        

        layout = [[sg.Multiline(size=(180,10),key='Output',pad=(0,20))],
                  [sg.Button(button_text = 'Settings',key='Settings'),sg.Button(button_text = 'Load Output',key='LOAD_OUTPUT'),sg.Exit()]]
       
        window = sg.Window('Settings Dynamic Update Test', layout, element_justification='center', size= (600,300))
    
    event, values = window.read()


    if event == sg.WIN_CLOSED or event == 'Exit':
        break
        window.close()    
        
    if event == 'Settings':
        create_settings_window(settings)
            
    else:
        print(event, values)
    
  window.close()
main()
    

Answer 1

It' better to handle each window in it's own event loop, mix windows together may get things mush difficult or complex.

Following example show the way to go.

import PySimpleGUI as sg

def popup():
    sg.theme('DarkBlue4')
    layout = [
        [sg.Text("You name"), sg.Input("", key='Name')],
        [sg.Text("", size=0, key='Test')],
        [sg.Button('Save'), sg.Button('Auto Fill'), sg.Button('Cancel')],
    ]
    window = sg.Window('Settings', layout, modal=True)
    while True:
        event, values = window.read()
        if event in (sg.WIN_CLOSED, 'Cancel'):
            flag = False
            break
        elif event == 'Save':
            settings['Name'] = values['Name']
            flag = True
            break
        elif event == 'Auto Fill':
            window['Test'].update(values['Name'])
    window.close()
    return flag

def main_window():
    sg.theme('DarkBlue3')
    name = settings['Name']
    value = name if name else 'None'
    layout = [
        [sg.Text("User Name:"), sg.Text(value, key='Name')],
        [sg.Button('Settings'), sg.Button('Exit')],
    ]
    return sg.Window('Main', layout)

settings = {'Name':None}
window = main_window()
while True:
    event, values = window.read()
    if event in (sg.WIN_CLOSED, 'Exit'):
        break
    elif event == 'Settings':
        flag = popup()
        if flag:
            window.close()
            window = main_window()
            """ or just update element
            name = settings['Name']
            value = name if name else 'None'
            window['Name'].update(value)
            """
window.close()