zewt · October 19, 2021 18:06 · Oct 19, 2021
diff --git a/gistfile1.txt b/gistfile1.txt
@@ -0,0 +1,40 @@
+from PySide2 import QtCore, QtGui, QtWidgets
+from maya import OpenMayaUI as omui
+from shiboken2 import wrapInstance
+
+class ClosingWindow(QtGui.QWindow):
+    def eventFilter(self, object, event):
+        # Prevent this window from being closed.  It should stay alive until Maya exits.
+        if object is self and event.type() == QtCore.QEvent.Close:
+            return True
+
+        return False
+
+    def __init__(self):
+        super().__init__()
+
+        # Try to stay hidden and at the end of alt-tab, but make sure we have an alt-tab entry.
+        self.setTitle('Closing...')
+        self.setFlags(QtCore.Qt.Dialog|QtCore.Qt.Window|QtCore.Qt.WindowStaysOnBottomHint)
+        self.installEventFilter(self)
+
+class MainWindowFilter(QtCore.QObject):
+    def eventFilter(self, object, event):
+        # Open CloseWindow when the main Maya window is closed.
+        global window
+        if event.type() == QtCore.QEvent.Close:
+            window = ClosingWindow()
+            window.show()
+            window.setVisibility(QtGui.QWindow.Minimized)
+
+        return False
+
+    def __init__(self):
+        super().__init__()
+        main_window = omui.MQtUtil.mainWindow()
+        window = wrapInstance(int(main_window), QtWidgets.QMainWindow)
+        window.window().installEventFilter(self)
+
+def go():
+    global filter
+    filter = MainWindowFilter()