AOO410/main/svl/source/notify/listener.cxx

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 * 
 * 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
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 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
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 * 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
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// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_svl.hxx"

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


//====================================================================
TYPEINIT0(SvtListener);

//====================================================================
// simple ctor of class SvtListener

SvtListener::SvtListener()
	: pBrdCastLst( 0 )
{
}
//--------------------------------------------------------------------

// copy ctor of class SvtListener

SvtListener::SvtListener( const SvtListener &rListener )
	: pBrdCastLst( 0 )
{
	SvtListenerBase* pLst = rListener.pBrdCastLst;
	while( pLst )
	{
		new SvtListenerBase( *this, *pLst->GetBroadcaster() );
		pLst = pLst->GetNext();
	}
}
//--------------------------------------------------------------------

// unregisteres the SvtListener from its SvtBroadcasters

SvtListener::~SvtListener()
{
	EndListeningAll();
}

//--------------------------------------------------------------------

// registeres at a specific SvtBroadcaster

sal_Bool SvtListener::StartListening( SvtBroadcaster& rBroadcaster )
{
	const SvtListenerBase* pLst = pBrdCastLst;
	while( pLst )
	{
		if( &rBroadcaster == pLst->GetBroadcaster() )
		{
			// double, than return
			return sal_False;
		}
		pLst = pLst->GetNext();
	}
	new SvtListenerBase( *this, rBroadcaster );
	return sal_True;
}

//--------------------------------------------------------------------

// unregisteres at a specific SvtBroadcaster

sal_Bool SvtListener::EndListening( SvtBroadcaster& rBroadcaster )
{
	SvtListenerBase *pLst = pBrdCastLst, *pPrev = pLst;
	while( pLst )
	{
		if( &rBroadcaster == pLst->GetBroadcaster() )
		{
			if( pBrdCastLst == pLst )
				pBrdCastLst = pLst->GetNext();
			else
				pPrev->SetNext( pLst->GetNext() );

			delete pLst;
			return sal_True;
		}
		pPrev = pLst;
		pLst = pLst->GetNext();
	}
	return sal_False;
}

//--------------------------------------------------------------------

// unregisteres all Broadcasters

void SvtListener::EndListeningAll()
{
	SvtListenerBase *pLst = pBrdCastLst;
	while( pLst )
	{
		SvtListenerBase *pDel = pLst;
		pLst = pLst->GetNext();

		delete pDel;
	}
	pBrdCastLst = 0;
}

//--------------------------------------------------------------------

sal_Bool SvtListener::IsListening( SvtBroadcaster& rBroadcaster ) const
{
	const SvtListenerBase *pLst = pBrdCastLst;
	while( pLst )
	{
		if( &rBroadcaster == pLst->GetBroadcaster() )
			break;
		pLst = pLst->GetNext();
	}
	return 0 != pLst;
}

//--------------------------------------------------------------------

// base implementation of notification handler

void SvtListener::Notify( SvtBroadcaster&
#ifdef DBG_UTIL
rBC
#endif
, const SfxHint& )
{
	DBG_ASSERT( IsListening( rBC ),
				"notification from unregistered broadcaster" );
}