1 files changed, 69 insertions, 0 deletions
diff --git a/sc/source/ui/unoobj/listenercalls.cxx b/sc/source/ui/unoobj/listenercalls.cxx
new file mode 100644
index 000000000..7ff7c7df0
--- /dev/null
+++ b/sc/source/ui/unoobj/listenercalls.cxx
@@ -0,0 +1,69 @@
+/* -*- 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 .
+ */
+
+#include <com/sun/star/util/XModifyListener.hpp>
+#include <osl/diagnose.h>
+
+#include <listenercalls.hxx>
+
+using namespace com::sun::star;
+
+ScUnoListenerCalls::ScUnoListenerCalls() {}
+
+ScUnoListenerCalls::~ScUnoListenerCalls()
+{
+    OSL_ENSURE(aEntries.empty(), "unhandled listener calls remaining");
+}
+
+void ScUnoListenerCalls::Add(const uno::Reference<util::XModifyListener>& rListener,
+                             const lang::EventObject& rEvent)
+{
+    if (rListener.is())
+        aEntries.emplace_back(rListener, rEvent);
+}
+
+void ScUnoListenerCalls::ExecuteAndClear()
+{
+    //  Execute all stored calls and remove them from the list.
+    //  During each modified() call, Add may be called again.
+    //  These new calls are executed here, too.
+
+    std::list<ScUnoListenerEntry>::iterator aItr(aEntries.begin());
+    while (aItr != aEntries.end())
+    {
+        ScUnoListenerEntry aEntry = *aItr;
+        try
+        {
+            aEntry.xListener->modified(aEntry.aEvent);
+        }
+        catch (const uno::RuntimeException&)
+        {
+            // the listener is an external object and may throw a RuntimeException
+            // for reasons we don't know
+        }
+
+        //  New calls that are added during the modified() call are appended to the end
+        //  of aEntries, so the loop will catch them, too (as long as erase happens
+        //  after modified).
+
+        aItr = aEntries.erase(aItr);
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */