New demo - restart a window(recreates a window)

DemoPrograms/Demo_Window_Open_Multiple_Times.py

@@ -0,0 +1,49 @@
+import PySimpleGUI as sg
+
+"""
+    Demo Restart Window (sorta reopen)
+    
+    Once a window is closed, you can't do anything with it.  You can't read it.  You can't "re-open" it.
+    The only choice is to recreate the window.  It's important that you use a "Fresh Layout" every time.
+    You can't pass the same layout from one indow to another.  You will get a popup error infomrning you
+    that you've attempted to resuse a layout.
+
+    The purpose of this demo is to show you the simple "make window" design pattern.  It simply makes a 
+    window using a layout that's defined in that function and returns the Window object.  It's not a bad
+    way to encapsulate windows if your applcation is gettinga little larger than the typical small data
+    entry window.
+
+    Copyright 2020 PySimpleGUI.org
+"""
+
+
+def make_window():
+    """
+    Defines a window layout and createws a indow using this layout.  The newly made Window
+    is returned to the caller.
+
+    :return: Window that is created using the layout defined in the function
+    :rtype: Window
+    """
+    layout = [[sg.Text('My Window')],
+              [sg.Input(key='-IN-'), sg.Text(size=(12, 1), key='-OUT-')],
+              [sg.Button('Go'), sg.Button('Exit')]]
+
+    return sg.Window('Window Title', layout)
+
+
+def main():
+    window = make_window()
+
+    while True:  # Event Loop
+        event, values = window.read()
+        print(event, values)
+        if event == sg.WIN_CLOSED or event == 'Exit':
+            window.close()
+            window = make_window()
+        elif event == 'Go':
+            window['-OUT-'].update(values['-IN-'])
+
+
+if __name__ == '__main__':
+    main()