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/* -*- 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: */
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