1 files changed, 77 insertions, 0 deletions
diff --git a/sd/source/ui/slidesorter/inc/controller/SlsSelectionObserver.hxx b/sd/source/ui/slidesorter/inc/controller/SlsSelectionObserver.hxx
new file mode 100644
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+++ b/sd/source/ui/slidesorter/inc/controller/SlsSelectionObserver.hxx
@@ -0,0 +1,77 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <sal/types.h>
+#include <memory>
+#include <vector>
+
+namespace sd::slidesorter
+{
+class SlideSorter;
+}
+
+class SdrPage;
+class SdPage;
+
+namespace sd::slidesorter::controller
+{
+/** Observe insertions and deletions of pages between calls to
+    StartObservation() and EndObservation().  When the later is called
+    the selection is set to just the newly inserted pages.
+*/
+class SelectionObserver final
+{
+public:
+    SelectionObserver(SlideSorter& rSlideSorter);
+    ~SelectionObserver();
+
+    void NotifyPageEvent(const SdrPage* pPage);
+    void StartObservation();
+    void AbortObservation();
+    void EndObservation();
+
+    /** Use this little class instead of calling StartObservation and
+        EndObservation directly so that EndObservation is not forgotten or
+        omitted due to an exception or some break or return in the middle of
+        code.
+    */
+    class Context
+    {
+    public:
+        Context(SlideSorter const& rSlideSorter);
+        ~Context() COVERITY_NOEXCEPT_FALSE;
+        void Abort();
+
+    private:
+        std::shared_ptr<SelectionObserver> mpSelectionObserver;
+    };
+
+private:
+    SlideSorter& mrSlideSorter;
+    bool mbIsObservationActive;
+    bool mbPageEventOccurred;
+
+    ::std::vector<const SdPage*> maInsertedPages;
+};
+
+} // end of namespace ::sd::slidesorter::controller
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */