weakeventlistener.hxx

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#ifndef INCLUDED_COMPHELPER_WEAKEVENTLISTENER_HXX
#define INCLUDED_COMPHELPER_WEAKEVENTLISTENER_HXX
 
#include <config_options.h>
#include <comphelper/compbase.hxx>
#include <cppuhelper/basemutex.hxx>
#include <cppuhelper/weakref.hxx>
#include <comphelper/comphelperdllapi.h>
#include <com/sun/star/lang/XEventListener.hpp>
#include <com/sun/star/lang/XComponent.hpp>
#include <utility>
 
namespace com::sun::star::uno { class XWeak; }
 
namespace comphelper
{
 
 
    //= OWeakListenerAdapterBase
 
    class OWeakListenerAdapterBase
    {
    private:
        css::uno::WeakReference< css::uno::XInterface >
                m_aListener;
        css::uno::Reference< css::uno::XInterface >
                m_xBroadcaster;
 
    protected:
        css::uno::Reference< css::uno::XInterface >
                getListener( ) const
        {
            return m_aListener.get();
        }
 
        const css::uno::Reference< css::uno::XInterface >&
                getBroadcaster( ) const
        {
            return m_xBroadcaster;
        }
 
        void resetListener( )
        {
            m_aListener.clear();
        }
 
 
    protected:
        OWeakListenerAdapterBase(
            const css::uno::Reference< css::uno::XWeak >& _rxListener,
            css::uno::Reference< css::uno::XInterface > _xBroadcaster
        )
            :m_aListener    (  _rxListener )
            ,m_xBroadcaster (std::move( _xBroadcaster ))
        {
        }
 
    protected:
        virtual ~OWeakListenerAdapterBase();
    };
 
 
    //= OWeakListenerAdapter
 
    template< class BROADCASTER, class LISTENER >
    class OWeakListenerAdapter
            :public ::comphelper::WeakComponentImplHelper< LISTENER >
            ,public OWeakListenerAdapterBase
    {
    protected:
        OWeakListenerAdapter(
            const css::uno::Reference< css::uno::XWeak >& _rxListener,
            const css::uno::Reference< BROADCASTER >& _rxBroadcaster
        );
 
    protected:
        css::uno::Reference< LISTENER > getListener( ) const
        {
            return  css::uno::Reference< LISTENER >( OWeakListenerAdapterBase::getListener(), css::uno::UNO_QUERY );
        }
 
        // XEventListener overridables
        virtual void SAL_CALL disposing( const css::lang::EventObject& Source ) override;
 
    protected:
        // OComponentHelper overridables
        // to be overridden, again - the derived class should revoke the listener from the broadcaster
        virtual void disposing( std::unique_lock<std::mutex>& rGuard ) override = 0;
    };
 
 
    //= OWeakEventListenerAdapter
 
    typedef OWeakListenerAdapter    <   css::lang::XComponent
                                    ,   css::lang::XEventListener
                                    >   OWeakEventListenerAdapter_Base;
    class UNLESS_MERGELIBS(COMPHELPER_DLLPUBLIC) OWeakEventListenerAdapter final : public OWeakEventListenerAdapter_Base
    {
    public:
        OWeakEventListenerAdapter(
            css::uno::Reference< css::uno::XWeak > const & _rxListener,
            css::uno::Reference< css::lang::XComponent > const & _rxBroadcaster
        );
 
        // nothing to do except an own ctor - the forwarding of the "disposing" is already done
        // in the base class
 
    private:
        using OWeakEventListenerAdapter_Base::disposing;
        virtual void disposing( std::unique_lock<std::mutex>& rGuard ) override;
    };
 
 
    //= OWeakListenerAdapter
 
 
    template< class BROADCASTER, class LISTENER >
    OWeakListenerAdapter< BROADCASTER, LISTENER >::OWeakListenerAdapter(
        const css::uno::Reference< css::uno::XWeak >& _rxListener,
        const css::uno::Reference< BROADCASTER >& _rxBroadcaster
    )
        : OWeakListenerAdapterBase( _rxListener, _rxBroadcaster )
    {
    }
 
 
    template< class BROADCASTER, class LISTENER >
    void SAL_CALL OWeakListenerAdapter< BROADCASTER, LISTENER >::disposing( const css::lang::EventObject& _rSource )
    {
        css::uno::Reference< LISTENER > xListener( getListener() );
        if ( xListener.is() )
            xListener->disposing( _rSource );
    }
 
 
}   // namespace comphelper
 
 
#endif // INCLUDED_COMPHELPER_WEAKEVENTLISTENER_HXX
 
 
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