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#include <tools/debug.hxx>
#include "listenerbase.hxx"
#include <svl/listeneriter.hxx>
#include <svl/listener.hxx>
#include <svl/broadcast.hxx>


SvtListenerBase::SvtListenerBase( SvtListener& rLst,
                                  SvtBroadcaster& rBroadcaster )
    : pLeft( 0 ), pRight( 0 ),
    pBroadcaster( &rBroadcaster ), pListener( &rLst )
{
    pNext = rLst.pBrdCastLst;
    rLst.pBrdCastLst = this;

    if( pBroadcaster->pRoot )
    {
        // set ever behind the root
        pRight = pBroadcaster->pRoot->pRight;
        pBroadcaster->pRoot->pRight = this;
        this->pLeft = pBroadcaster->pRoot;
        if( pRight )
            pRight->pLeft = this;
    }
    else
        pBroadcaster->pRoot = this;
}

SvtListenerBase::~SvtListenerBase()
{
    SvtListenerBase *pR = pRight, *pL = pLeft;
    if( pBroadcaster->pRoot )
        pBroadcaster->pRoot = pL ? pL : pR;

    if( pL )
        pL->pRight = pR;
    if( pR )
        pR->pLeft = pL;

    SvtListenerIter::RemoveListener( *this, pR );

    if( !pBroadcaster->pRoot )
        pBroadcaster->ListenersGone();
}


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