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diff --git a/sd/source/ui/slidesorter/cache/SlsRequestPriorityClass.hxx b/sd/source/ui/slidesorter/cache/SlsRequestPriorityClass.hxx
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+++ b/sd/source/ui/slidesorter/cache/SlsRequestPriorityClass.hxx
@@ -0,0 +1,55 @@
+/*************************************************************************
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * Copyright 2000, 2010 Oracle and/or its affiliates.
+ *
+ * OpenOffice.org - a multi-platform office productivity suite
+ *
+ * This file is part of OpenOffice.org.
+ *
+ * OpenOffice.org is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 3
+ * only, as published by the Free Software Foundation.
+ *
+ * OpenOffice.org is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License version 3 for more details
+ * (a copy is included in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * version 3 along with OpenOffice.org.  If not, see
+ * <http://www.openoffice.org/license.html>
+ * for a copy of the LGPLv3 License.
+ *
+ ************************************************************************/
+
+#ifndef SD_SLIDESORTER_CACHE_REQUEST_PRIORITY_CLASS_HXX
+#define SD_SLIDESORTER_CACHE_REQUEST_PRIORITY_CLASS_HXX
+
+namespace sd { namespace slidesorter { namespace cache {
+
+
+/** Each request for a preview creation has a priority.  This enum defines
+    the available priorities.  The special values MIN__CLASS and MAX__CLASS
+    are/can be used for validation and have to be kept up-to-date.
+*/
+enum RequestPriorityClass
+{
+    MIN__CLASS = 0,
+
+    // The slide is visible.  A preview does not yet exist.
+    VISIBLE_NO_PREVIEW = MIN__CLASS,
+    // The slide is visible.  A preview exists but is not up-to-date anymore.
+    VISIBLE_OUTDATED_PREVIEW,
+    // The slide is not visible.
+    NOT_VISIBLE,
+
+    MAX__CLASS = NOT_VISIBLE
+};
+
+
+} } } // end of namespace ::sd::slidesorter::cache
+
+#endif