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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "msgIDelegateList.idl"
+
+/**
+ * Mailnews code typically has a C++ base class for objects, which is then
+ * specialized for each account type with a C++ subclass of the base class.
+ *
+ * This interface provides the ability of JavaScript-based account
+ * implementations to use the same C++ base classes as core objects, but
+ * use JavaScript to override methods instead of C++.
+ */
+
+[scriptable, uuid(68075269-8BBD-4a09-AC04-3241BF44F633)]
+interface msgIOverride : nsISupports
+{
+ /**
+ *
+ * A list of methods in the C++ base class that will be delegated to the JS
+ * delegate. This is calculated once, and then a fixed value is set to
+ * all subsequent instances so that it does not need to be recalculated each
+ * time. If the value has not yet been set, this will return a new instance.
+ */
+ attribute msgIDelegateList methodsToDelegate;
+
+ /**
+ * JavaScript-based xpcom object that overrides C++ methods.
+ */
+ attribute nsISupports jsDelegate;
+
+ /**
+ * C++ class used to implement default functionality. This is used when
+ * JavaScript methods want to call the base class default action, bypassing a
+ * possible JS override.
+ */
+ readonly attribute nsISupports cppBase;
+};