1 files changed, 40 insertions, 0 deletions
diff --git a/comm/mailnews/base/public/MailNewsTypes.h b/comm/mailnews/base/public/MailNewsTypes.h
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index 0000000000..e6f58cb56b
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+++ b/comm/mailnews/base/public/MailNewsTypes.h
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#ifndef MailNewsTypes_h__
+#define MailNewsTypes_h__
+
+#include "msgCore.h"
+#include "MailNewsTypes2.h"
+
+/* nsMsgKey is a unique ID for a particular message in a folder.  If you want
+   a handle to a message that will remain valid even after resorting the folder
+   or otherwise changing their indices, you want one of these rather than a
+   nsMsgViewIndex. nsMsgKeys don't survive local mail folder compression,
+   however.
+ */
+const nsMsgKey nsMsgKey_None = 0xffffffff;
+
+/* nsMsgViewIndex
+ *
+ * A generic index type from which other index types are derived.  All
+ * nsMsgViewIndex derived types are zero based.
+ *
+ * The following index types are currently supported:
+ *  - nsMsgViewIndex - an index into the list of messages or folders or groups,
+ *    where zero is the first one to show, one is the second, etc...
+ *  - AB_SelectionIndex
+ *  - AB_NameCompletionIndex
+ */
+
+const nsMsgViewIndex nsMsgViewIndex_None = 0xFFFFFFFF;
+
+/* kSizeUnknown is a special value of folder size that indicates the size
+ * is unknown yet. Usually this causes the folder to determine the real size
+ * immediately as it is queried by a consumer.
+ */
+const int64_t kSizeUnknown = -1;
+
+#endif