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Diffstat (limited to 'comphelper/inc/comphelper/weakeventlistener.hxx')
| -rw-r--r-- | comphelper/inc/comphelper/weakeventlistener.hxx | 189 |
1 files changed, 189 insertions, 0 deletions
diff --git a/comphelper/inc/comphelper/weakeventlistener.hxx b/comphelper/inc/comphelper/weakeventlistener.hxx new file mode 100644 index 000000000000..930f19f3a40f --- /dev/null +++ b/comphelper/inc/comphelper/weakeventlistener.hxx @@ -0,0 +1,189 @@ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +#ifndef COMPHELPER_WEAKEVENTLISTENER_HXX +#define COMPHELPER_WEAKEVENTLISTENER_HXX + +#include <cppuhelper/compbase1.hxx> +#include <com/sun/star/lang/XComponent.hpp> +#include <com/sun/star/uno/XWeak.hpp> +#include <cppuhelper/weakref.hxx> +#include <comphelper/broadcasthelper.hxx> +#include "comphelper/comphelperdllapi.h" + +//......................................................................... +namespace comphelper +{ +//......................................................................... + + //===================================================================== + //= OWeakListenerAdapterBase + //===================================================================== + /** (the base for) an adapter which allows to add as listener to a foreign component, without + being held hard. + + <p>The idea is that this adapter is added as listener to a foreign component, which usually + holds it's listener hard. The adapter itself knows the real listener as weak reference, + thus not affecting it's life time.</p> + */ + class OWeakListenerAdapterBase : public OBaseMutex + { + private: + ::com::sun::star::uno::WeakReference< ::com::sun::star::uno::XInterface > + m_aListener; + ::com::sun::star::uno::Reference< ::com::sun::star::uno::XInterface > + m_xBroadcaster; + + protected: + inline ::com::sun::star::uno::Reference< ::com::sun::star::uno::XInterface > + getListener( ) const + { + return m_aListener.get(); + } + + inline const ::com::sun::star::uno::Reference< ::com::sun::star::uno::XInterface >& + getBroadcaster( ) const + { + return m_xBroadcaster; + } + + inline void resetListener( ) + { + m_aListener.clear(); + } + + + protected: + inline OWeakListenerAdapterBase( + const ::com::sun::star::uno::Reference< ::com::sun::star::uno::XWeak >& _rxListener, + const ::com::sun::star::uno::Reference< ::com::sun::star::uno::XInterface >& _rxBroadcaster + ) + :m_aListener ( _rxListener ) + ,m_xBroadcaster ( _rxBroadcaster ) + { + } + + protected: + virtual ~OWeakListenerAdapterBase(); + }; + + + //===================================================================== + //= OWeakListenerAdapter + //===================================================================== + template< class BROADCASTER, class LISTENER > + /** yet another base for weak listener adapters, this time with some type safety + + <p>Note that derived classes need to overwrite all virtual methods of their interface + except XEventListener::disposing, and forward it to their master listener.</p> + + <p>Addtionally, derived classes need to add themself as listener to the broadcaster, + as this can't be done in a generic way</p> + */ + class OWeakListenerAdapter + :public ::cppu::WeakComponentImplHelper1 < LISTENER > + ,public OWeakListenerAdapterBase + { + protected: + /** ctor + <p>Note that derived classes still need to add themself as listener to the broadcaster, + as this can't be done in a generic way</p> + */ + OWeakListenerAdapter( + const ::com::sun::star::uno::Reference< ::com::sun::star::uno::XWeak >& _rxListener, + const ::com::sun::star::uno::Reference< BROADCASTER >& _rxBroadcaster + ); + + protected: + inline ::com::sun::star::uno::Reference< LISTENER > getListener( ) const + { + return ::com::sun::star::uno::Reference< LISTENER >( OWeakListenerAdapterBase::getListener(), ::com::sun::star::uno::UNO_QUERY ); + } + + // XEventListener overridables + virtual void SAL_CALL disposing( const ::com::sun::star::lang::EventObject& Source ) throw (::com::sun::star::uno::RuntimeException); + + protected: + // OComponentHelper overridables + // to be overridden, again - the derived class should revoke the listener from the broadcaster + virtual void SAL_CALL disposing( ) = 0; + }; + + //===================================================================== + //= OWeakEventListenerAdapter + //===================================================================== + typedef OWeakListenerAdapter < ::com::sun::star::lang::XComponent + , ::com::sun::star::lang::XEventListener + > OWeakEventListenerAdapter_Base; + /** the most simple listener adapter: for XEventListeners at XComponents + */ + class COMPHELPER_DLLPUBLIC OWeakEventListenerAdapter : public OWeakEventListenerAdapter_Base + { + public: + OWeakEventListenerAdapter( + ::com::sun::star::uno::Reference< ::com::sun::star::uno::XWeak > _rxListener, + ::com::sun::star::uno::Reference< ::com::sun::star::lang::XComponent > _rxBroadcaster + ); + + // nothing to do except an own ctor - the forwarding of the "disposing" is already done + // in the base class + + protected: + using OWeakEventListenerAdapter_Base::disposing; + virtual void SAL_CALL disposing( ); + }; + + //===================================================================== + //= OWeakListenerAdapter + //===================================================================== + //--------------------------------------------------------------------- + template< class BROADCASTER, class LISTENER > + OWeakListenerAdapter< BROADCASTER, LISTENER >::OWeakListenerAdapter( + const ::com::sun::star::uno::Reference< ::com::sun::star::uno::XWeak >& _rxListener, + const ::com::sun::star::uno::Reference< BROADCASTER >& _rxBroadcaster + ) + : ::cppu::WeakComponentImplHelper1< LISTENER >( m_aMutex ) + , OWeakListenerAdapterBase( _rxListener, _rxBroadcaster ) + { + } + + //--------------------------------------------------------------------- + template< class BROADCASTER, class LISTENER > + void SAL_CALL OWeakListenerAdapter< BROADCASTER, LISTENER >::disposing( const ::com::sun::star::lang::EventObject& _rSource ) throw (::com::sun::star::uno::RuntimeException) + { + ::com::sun::star::uno::Reference< LISTENER > xListener( getListener() ); + if ( xListener.is() ) + xListener->disposing( _rSource ); + } + +//......................................................................... +} // namespace comphelper +//......................................................................... + +#endif// COMPHELPER_WEAKEVENTLISTENER_HXX + + |