Close attempted demo

DemoPrograms/Demo_Close_Attempted_Event.py

@@ -0,0 +1,27 @@
+import PySimpleGUI as sg
+
+"""
+    Demo_Close_Attempted_Event
+
+    Catches if a window close was tried by user (click "X") and confirms with a popup.
+    Requires PySimpleGUI 4.33.0 and later
+
+    Copyright 2021 PySimpleGUI Inc.
+"""
+
+layout = [[sg.Text('Close confirmation demo')],
+          [sg.Text('Try closing window with the "X"')],
+          [sg.Button('Go'), sg.Button('Exit')]]
+
+window = sg.Window('Window Title', layout, enable_close_attempted_event=True)
+
+while True:
+    event, values = window.read()
+    print(event, values)
+    if event == sg.WINDOW_CLOSE_ATTEMPTED_EVENT:
+        if sg.popup_yes_no('Do yuou really want to exit?') == 'Yes':
+            break
+    if event in (sg.WIN_CLOSED, 'Exit'):
+        break
+
+window.close()