1 files changed, 178 insertions, 0 deletions
diff --git a/svl/source/notify/SfxBroadcaster.cxx b/svl/source/notify/SfxBroadcaster.cxx
new file mode 100644
index 000000000..2e312a80c
--- /dev/null
+++ b/svl/source/notify/SfxBroadcaster.cxx
@@ -0,0 +1,178 @@
+/* -*- 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 <svl/SfxBroadcaster.hxx>
+
+#include <svl/hint.hxx>
+#include <svl/lstner.hxx>
+#include <tools/debug.hxx>
+
+#include <algorithm>
+#include <cassert>
+#include <vector>
+
+
+typedef std::vector<SfxListener*> SfxListenerArr_Impl;
+
+struct SfxBroadcaster::Impl
+{
+    /** Contains the positions of removed listeners. */
+    std::vector<size_t>     m_RemovedPositions;
+    SfxListenerArr_Impl     m_Listeners;
+};
+
+// broadcast immediately
+
+void SfxBroadcaster::Broadcast( const SfxHint &rHint )
+{
+    // notify all registered listeners exactly once
+    for (size_t i = 0; i < mpImpl->m_Listeners.size(); ++i)
+    {
+        SfxListener *const pListener = mpImpl->m_Listeners[i];
+        if (pListener)
+            pListener->Notify( *this, rHint );
+    }
+}
+
+// unregister all listeners
+
+SfxBroadcaster::~SfxBroadcaster() COVERITY_NOEXCEPT_FALSE
+{
+    Broadcast( SfxHint(SfxHintId::Dying) );
+
+    // remove all still registered listeners
+    for (size_t i = 0; i < mpImpl->m_Listeners.size(); ++i)
+    {
+        SfxListener *const pListener = mpImpl->m_Listeners[i];
+        if (pListener)
+            pListener->RemoveBroadcaster_Impl(*this);
+    }
+}
+
+
+// simple ctor of class SfxBroadcaster
+
+SfxBroadcaster::SfxBroadcaster() : mpImpl(new Impl)
+{
+}
+
+
+// copy ctor of class SfxBroadcaster
+
+
+SfxBroadcaster::SfxBroadcaster( const SfxBroadcaster &rBC ) : mpImpl(new Impl)
+{
+    for (size_t i = 0; i < rBC.mpImpl->m_Listeners.size(); ++i)
+    {
+        SfxListener *const pListener = rBC.mpImpl->m_Listeners[i];
+        if (pListener)
+            pListener->StartListening( *this );
+    }
+}
+
+
+// add a new SfxListener to the list
+
+void SfxBroadcaster::AddListener( SfxListener& rListener )
+{
+    DBG_TESTSOLARMUTEX();
+    if (mpImpl->m_RemovedPositions.empty())
+    {
+        mpImpl->m_Listeners.push_back(&rListener);
+    }
+    else
+    {
+        size_t targetPosition = mpImpl->m_RemovedPositions.back();
+        mpImpl->m_RemovedPositions.pop_back();
+        assert(mpImpl->m_Listeners[targetPosition] == nullptr);
+        mpImpl->m_Listeners[targetPosition] = &rListener;
+    }
+}
+
+
+// forward a notification to all registered listeners
+
+void SfxBroadcaster::Forward(SfxBroadcaster& rBC, const SfxHint& rHint)
+{
+    for (size_t i = 0; i < mpImpl->m_Listeners.size(); ++i)
+    {
+        SfxListener *const pListener = mpImpl->m_Listeners[i];
+        if (pListener)
+            pListener->Notify( rBC, rHint );
+    }
+}
+
+
+// remove one SfxListener from the list
+
+void SfxBroadcaster::RemoveListener( SfxListener& rListener )
+{
+    DBG_TESTSOLARMUTEX();
+
+    // First, check the slots either side of the last removed slot, makes a significant
+    // difference when the list is large.
+    int positionOfRemovedElement = -1;
+    if (!mpImpl->m_RemovedPositions.empty())
+    {
+        auto i = mpImpl->m_RemovedPositions.back();
+        if (i < mpImpl->m_Listeners.size() - 2 && mpImpl->m_Listeners[i+1] == &rListener)
+        {
+            positionOfRemovedElement = i + 1;
+        }
+        else if (i > 0 && mpImpl->m_Listeners[i-1] == &rListener)
+        {
+            positionOfRemovedElement = i-1;
+        }
+    }
+    // then scan the whole list if we didn't find it
+    if (positionOfRemovedElement == -1)
+    {
+        SfxListenerArr_Impl::iterator aIter = std::find(
+                mpImpl->m_Listeners.begin(), mpImpl->m_Listeners.end(), &rListener);
+        positionOfRemovedElement = std::distance(mpImpl->m_Listeners.begin(), aIter);
+    }
+    // DO NOT erase the listener, set the pointer to 0
+    // because the current continuation may contain this->Broadcast
+    mpImpl->m_Listeners[positionOfRemovedElement] = nullptr;
+    mpImpl->m_RemovedPositions.push_back(positionOfRemovedElement);
+}
+
+bool SfxBroadcaster::HasListeners() const
+{
+    return (GetListenerCount() != 0);
+}
+
+size_t SfxBroadcaster::GetListenerCount() const
+{
+    assert(mpImpl->m_Listeners.size() >= mpImpl->m_RemovedPositions.size());
+    return mpImpl->m_Listeners.size() - mpImpl->m_RemovedPositions.size();
+}
+
+size_t SfxBroadcaster::GetSizeOfVector() const
+{
+    return mpImpl->m_Listeners.size();
+}
+
+SfxListener* SfxBroadcaster::GetListener( size_t nNo ) const
+{
+    return mpImpl->m_Listeners[nNo];
+}
+
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */