PySimpleGUI/Demo_Design_Pattern_Persist...

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# -------------------------------------#
# DESIGN PATTERN 2 - Persistent Window #
# Update a text field based on input #
# -------------------------------------#
import sys
if sys.version_info[0] >= 3:
import PySimpleGUI as sg
else:
import PySimpleGUI27 as sg
layout = [[sg.Text('Your typed chars appear here:'), sg.Text('', key='_OUTPUT_') ],
[sg.Input(key='_IN_')],
[sg.Button('Show'), sg.Button('Exit')],
]
window = sg.Window('My new window').Layout(layout)
while True: # Event Loop
event, values = window.Read()
if event is None or event == 'Exit':
break
if event == 'Show': # change the text "output" element to be the value of "input" element
window.FindElement('_OUTPUT_').Update(values['_IN_'])