| /************************************************************** |
| * |
| * 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 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| * |
| *************************************************************/ |
| |
| |
| #ifndef INCLUDED_SLIDESHOW_LISTENERCONTAINERIMPL_HXX |
| #define INCLUDED_SLIDESHOW_LISTENERCONTAINERIMPL_HXX |
| |
| #include <sal/config.h> |
| #include <boost/weak_ptr.hpp> |
| |
| namespace slideshow { |
| namespace internal { |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| struct EmptyBase |
| { |
| struct EmptyGuard{ explicit EmptyGuard(EmptyBase) {} }; |
| struct EmptyClearableGuard |
| { |
| explicit EmptyClearableGuard(EmptyBase) {} |
| void clear() {} |
| void reset() {} |
| }; |
| |
| typedef EmptyGuard Guard; |
| typedef EmptyClearableGuard ClearableGuard; |
| }; |
| |
| class MutexBase |
| { |
| public: |
| struct Guard : public osl::MutexGuard |
| { |
| explicit Guard(MutexBase const& rBase) : |
| osl::MutexGuard(rBase.maMutex) |
| {} |
| }; |
| struct ClearableGuard : public osl::ClearableMutexGuard |
| { |
| explicit ClearableGuard(MutexBase const& rBase) : |
| osl::ClearableMutexGuard(rBase.maMutex) |
| {} |
| }; |
| |
| mutable osl::Mutex maMutex; |
| }; |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| template< typename result_type, typename ListenerTargetT > struct FunctionApply |
| { |
| template<typename FuncT> static bool apply( |
| FuncT func, |
| ListenerTargetT const& rArg ) |
| { |
| return func(rArg); |
| } |
| }; |
| |
| template<typename ListenerTargetT> struct FunctionApply<void,ListenerTargetT> |
| { |
| template<typename FuncT> static bool apply( |
| FuncT func, |
| ListenerTargetT const& rArg ) |
| { |
| func(rArg); |
| return true; |
| } |
| }; |
| |
| //////////////////////////////////////////////////////////////////////////// |
| |
| template< typename ListenerT > struct ListenerOperations |
| { |
| /// Notify a single one of the listeners |
| template< typename ContainerT, |
| typename FuncT > |
| static bool notifySingleListener( ContainerT& rContainer, |
| FuncT func ) |
| { |
| const typename ContainerT::const_iterator aEnd( rContainer.end() ); |
| |
| // true: a handler in this queue processed the event |
| // false: no handler in this queue finally processed the event |
| return (std::find_if( rContainer.begin(), |
| aEnd, |
| func ) != aEnd); |
| } |
| |
| /// Notify all listeners |
| template< typename ContainerT, |
| typename FuncT > |
| static bool notifyAllListeners( ContainerT& rContainer, |
| FuncT func ) |
| { |
| bool bRet(false); |
| typename ContainerT::const_iterator aCurr( rContainer.begin() ); |
| typename ContainerT::const_iterator const aEnd ( rContainer.end() ); |
| while( aCurr != aEnd ) |
| { |
| if( FunctionApply< typename FuncT::result_type, |
| typename ContainerT::value_type >::apply( |
| func, |
| *aCurr) ) |
| { |
| bRet = true; |
| } |
| |
| ++aCurr; |
| } |
| |
| // true: at least one handler returned true |
| // false: not a single handler returned true |
| return bRet; |
| } |
| |
| /// Prune container from deceased listeners |
| template< typename ContainerT > |
| static void pruneListeners( ContainerT&, size_t ) |
| { |
| } |
| }; |
| |
| // specializations for weak_ptr |
| // ---------------------------- |
| template< typename ListenerTargetT > |
| struct ListenerOperations< boost::weak_ptr<ListenerTargetT> > |
| { |
| template< typename ContainerT, |
| typename FuncT > |
| static bool notifySingleListener( ContainerT& rContainer, |
| FuncT func ) |
| { |
| typename ContainerT::const_iterator aCurr( rContainer.begin() ); |
| typename ContainerT::const_iterator const aEnd ( rContainer.end() ); |
| while( aCurr != aEnd ) |
| { |
| boost::shared_ptr<ListenerTargetT> pListener( aCurr->lock() ); |
| |
| if( pListener && func(pListener) ) |
| return true; |
| |
| ++aCurr; |
| } |
| |
| return false; |
| } |
| |
| template< typename ContainerT, |
| typename FuncT > |
| static bool notifyAllListeners( ContainerT& rContainer, |
| FuncT func ) |
| { |
| bool bRet(false); |
| typename ContainerT::const_iterator aCurr( rContainer.begin() ); |
| typename ContainerT::const_iterator const aEnd ( rContainer.end() ); |
| while( aCurr != aEnd ) |
| { |
| boost::shared_ptr<ListenerTargetT> pListener( aCurr->lock() ); |
| |
| if( pListener.get() && |
| FunctionApply< typename FuncT::result_type, |
| boost::shared_ptr<ListenerTargetT> >::apply(func,pListener) ) |
| { |
| bRet = true; |
| } |
| |
| ++aCurr; |
| } |
| |
| return bRet; |
| } |
| |
| template< typename ContainerT > |
| static void pruneListeners( ContainerT& rContainer, |
| size_t nSizeThreshold ) |
| { |
| if( rContainer.size() <= nSizeThreshold ) |
| return; |
| |
| ContainerT aAliveListeners; |
| aAliveListeners.reserve(rContainer.size()); |
| |
| typename ContainerT::const_iterator aCurr( rContainer.begin() ); |
| typename ContainerT::const_iterator const aEnd ( rContainer.end() ); |
| while( aCurr != aEnd ) |
| { |
| if( !aCurr->expired() ) |
| aAliveListeners.push_back( *aCurr ); |
| |
| ++aCurr; |
| } |
| |
| std::swap( rContainer, aAliveListeners ); |
| } |
| }; |
| |
| } // namespace internal |
| } // namespace Presentation |
| |
| #endif /* INCLUDED_SLIDESHOW_LISTENERCONTAINERIMPL_HXX */ |
| |