xref: /aoo41x/main/reportdesign/source/core/sdr/UndoEnv.cxx (revision cdf0e10c)

/*************************************************************************
 *
 * 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.
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#include "UndoActions.hxx"
#include "UndoEnv.hxx"
#include "formatnormalizer.hxx"
#include "conditionupdater.hxx"
#include "corestrings.hrc"
#include "rptui_slotid.hrc"
#include "RptDef.hxx"
#include "ModuleHelper.hxx"
#include "RptObject.hxx"
#include "RptPage.hxx"
#include "RptResId.hrc"
#include "RptModel.hxx"

/** === begin UNO includes === **/
#include <com/sun/star/script/XEventAttacherManager.hpp>
#include <com/sun/star/container/XChild.hpp>
#include <com/sun/star/container/XNameContainer.hpp>
#include <com/sun/star/beans/PropertyAttribute.hpp>
#include <com/sun/star/util/XModifyBroadcaster.hpp>
#include <com/sun/star/beans/XIntrospectionAccess.hpp>
#include <com/sun/star/beans/XIntrospection.hpp>
/** === end UNO includes === **/

#include <connectivity/dbtools.hxx>
#include <svl/smplhint.hxx>
#include <tools/diagnose_ex.h>
#include <comphelper/stl_types.hxx>
#include <comphelper/componentcontext.hxx>
#include <vcl/svapp.hxx>
#include <dbaccess/dbsubcomponentcontroller.hxx>
#include <svx/unoshape.hxx>
#include <vos/mutex.hxx>

namespace rptui
{
	using namespace ::com::sun::star;
	using namespace uno;
	using namespace lang;
	using namespace script;
	using namespace beans;
	using namespace awt;
	using namespace util;
	using namespace container;
	using namespace report;
//----------------------------------------------------------------------------


struct PropertyInfo
{
    bool    bIsReadonlyOrTransient;

    PropertyInfo()
        :bIsReadonlyOrTransient( false )
    {
    }

    PropertyInfo( const bool i_bIsTransientOrReadOnly )
        :bIsReadonlyOrTransient( i_bIsTransientOrReadOnly )
    {
    }
};

typedef ::std::hash_map< ::rtl::OUString, PropertyInfo, ::rtl::OUStringHash >    PropertiesInfo;

struct ObjectInfo
{
    PropertiesInfo              aProperties;
    Reference< XPropertySet >   xPropertyIntrospection;

    ObjectInfo()
        :aProperties()
        ,xPropertyIntrospection()
    {
    }
};

typedef ::std::map< Reference< XPropertySet >, ObjectInfo, ::comphelper::OInterfaceCompare< XPropertySet > >    PropertySetInfoCache;

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

class OXUndoEnvironmentImpl
{
    OXUndoEnvironmentImpl(OXUndoEnvironmentImpl&);
    void operator =(OXUndoEnvironmentImpl&);
public:
    OReportModel&                                       m_rModel;
    PropertySetInfoCache                                m_aPropertySetCache;
    FormatNormalizer                                    m_aFormatNormalizer;
    ConditionUpdater                                    m_aConditionUpdater;
    ::osl::Mutex                                        m_aMutex;
	::std::vector< uno::Reference< container::XChild> > m_aSections;
    Reference< XIntrospection >                         m_xIntrospection;
    oslInterlockedCount                                 m_nLocks;
	sal_Bool	                                        m_bReadOnly;
    sal_Bool                                            m_bIsUndo;

    OXUndoEnvironmentImpl(OReportModel& _rModel);
};

OXUndoEnvironmentImpl::OXUndoEnvironmentImpl(OReportModel& _rModel) : m_rModel(_rModel)
        ,m_aFormatNormalizer( _rModel )
        ,m_aConditionUpdater()
        ,m_nLocks(0)
		,m_bReadOnly(sal_False)
        ,m_bIsUndo(sal_False)
{
}

//------------------------------------------------------------------------------
DBG_NAME( rpt_OXUndoEnvironment );
//------------------------------------------------------------------------------
OXUndoEnvironment::OXUndoEnvironment(OReportModel& _rModel)
				   :m_pImpl(new OXUndoEnvironmentImpl(_rModel) )
{
	DBG_CTOR( rpt_OXUndoEnvironment,NULL);
    StartListening(m_pImpl->m_rModel);
}

//------------------------------------------------------------------------------
OXUndoEnvironment::~OXUndoEnvironment()
{
	DBG_DTOR( rpt_OXUndoEnvironment,NULL);
}
// -----------------------------------------------------------------------------
void OXUndoEnvironment::Lock()
{
    OSL_ENSURE(m_refCount,"Illegal call to dead object!");
    osl_incrementInterlockedCount( &m_pImpl->m_nLocks );
}
void OXUndoEnvironment::UnLock()
{
    OSL_ENSURE(m_refCount,"Illegal call to dead object!");

    osl_decrementInterlockedCount( &m_pImpl->m_nLocks );
}
sal_Bool OXUndoEnvironment::IsLocked() const { return m_pImpl->m_nLocks != 0; }
// -----------------------------------------------------------------------------
void OXUndoEnvironment::RemoveSection(OReportPage* _pPage)
{
    if ( _pPage )
    {
        Reference< XInterface > xSection(_pPage->getSection());
        if ( xSection.is() )
		    RemoveElement( xSection );
    }
}
//------------------------------------------------------------------------------
void OXUndoEnvironment::Clear(const Accessor& /*_r*/)
{
	OUndoEnvLock aLock(*this);

#if OSL_DEBUG_LEVEL > 0
    // TODO: LLA->OJ please describe what you are doing in this code fragment.
    PropertySetInfoCache::iterator aIter = m_pImpl->m_aPropertySetCache.begin();
    PropertySetInfoCache::iterator aEnd = m_pImpl->m_aPropertySetCache.end();
    int ndbg_len = m_pImpl->m_aPropertySetCache.size();
    ndbg_len = ndbg_len;
    for (int idbg_ = 0; aIter != aEnd; ++aIter,++idbg_)
    {
        uno::Reference<beans::XPropertySet> xProp(aIter->first,uno::UNO_QUERY);
        xProp->getPropertySetInfo();
        int nlen = aIter->second.aProperties.size();
        nlen = nlen;
    }
#endif
    m_pImpl->m_aPropertySetCache.clear();

	sal_uInt16 nCount = m_pImpl->m_rModel.GetPageCount();
	sal_uInt16 i;
	for (i = 0; i < nCount; i++)
	{
        OReportPage* pPage = PTR_CAST( OReportPage, m_pImpl->m_rModel.GetPage(i) );
        RemoveSection(pPage);
	}

	nCount = m_pImpl->m_rModel.GetMasterPageCount();
	for (i = 0; i < nCount; i++)
	{
        OReportPage* pPage = PTR_CAST( OReportPage, m_pImpl->m_rModel.GetMasterPage(i) );
        RemoveSection(pPage);
	}

    m_pImpl->m_aSections.clear();

	if (IsListening(m_pImpl->m_rModel))
		EndListening(m_pImpl->m_rModel);
}

//------------------------------------------------------------------------------
void OXUndoEnvironment::ModeChanged()
{
	m_pImpl->m_bReadOnly = !m_pImpl->m_bReadOnly;

	if (!m_pImpl->m_bReadOnly)
		StartListening(m_pImpl->m_rModel);
	else
		EndListening(m_pImpl->m_rModel);
}

//------------------------------------------------------------------------------
void OXUndoEnvironment::Notify( SfxBroadcaster& /*rBC*/, const SfxHint& rHint )
{
    if (rHint.ISA(SfxSimpleHint) && ((SfxSimpleHint&)rHint).GetId() == SFX_HINT_MODECHANGED )
        ModeChanged();
}
// -----------------------------------------------------------------------------
//	XEventListener
//------------------------------------------------------------------------------
void SAL_CALL OXUndoEnvironment::disposing(const EventObject& e) throw( RuntimeException )
{
	// check if it's an object we have cached informations about
    Reference< XPropertySet > xSourceSet(e.Source, UNO_QUERY);
    if ( xSourceSet.is() )
    {
        uno::Reference< report::XSection> xSection(xSourceSet,uno::UNO_QUERY);
        if ( xSection.is() )
            RemoveSection(xSection);
        else
            RemoveElement(xSourceSet);
        /*if (!m_pImpl->m_aPropertySetCache.empty())
			m_pImpl->m_aPropertySetCache.erase(xSourceSet);*/
	}
}

// XPropertyChangeListener
//------------------------------------------------------------------------------
void SAL_CALL OXUndoEnvironment::propertyChange( const PropertyChangeEvent& _rEvent ) throw(uno::RuntimeException)
{
    ::osl::ClearableMutexGuard aGuard( m_pImpl->m_aMutex );

	if ( IsLocked() )
        return;

    Reference< XPropertySet >  xSet( _rEvent.Source, UNO_QUERY );
	if (!xSet.is())
		return;

	dbaui::DBSubComponentController* pController = m_pImpl->m_rModel.getController();
    if ( !pController )
        return;

    // no Undo for transient and readonly props.
	// let's see if we know something about the set
#if OSL_DEBUG_LEVEL > 0
    int nlen = m_pImpl->m_aPropertySetCache.size();
    nlen = nlen;
#endif
    PropertySetInfoCache::iterator objectPos = m_pImpl->m_aPropertySetCache.find(xSet);
	if (objectPos == m_pImpl->m_aPropertySetCache.end())
	{
		objectPos = m_pImpl->m_aPropertySetCache.insert( PropertySetInfoCache::value_type(
            xSet, ObjectInfo()
        ) ).first;
		DBG_ASSERT(objectPos != m_pImpl->m_aPropertySetCache.end(), "OXUndoEnvironment::propertyChange : just inserted it ... why it's not there ?");
	}
	if ( objectPos == m_pImpl->m_aPropertySetCache.end() )
        return;

	// now we have access to the cached info about the set
	// let's see what we know about the property
    ObjectInfo& rObjectInfo = objectPos->second;
    PropertiesInfo::iterator aPropertyPos = rObjectInfo.aProperties.find( _rEvent.PropertyName );
	if ( aPropertyPos == rObjectInfo.aProperties.end() )
	{	// nothing 'til now ... have to change this ....
		// the attributes
        Reference< XPropertySetInfo > xPSI( xSet->getPropertySetInfo(), UNO_SET_THROW );
		sal_Int32 nPropertyAttributes = 0;
        try
        {
            if ( xPSI->hasPropertyByName( _rEvent.PropertyName ) )
            {
                nPropertyAttributes = xPSI->getPropertyByName( _rEvent.PropertyName ).Attributes;
            }
            else
            {
                // it's perfectly valid for a component to notify a change in a property which it doesn't have - as long
                // as it has an attribute with this name
                if ( !rObjectInfo.xPropertyIntrospection.is() )
                {
                    if ( !m_pImpl->m_xIntrospection.is() )
                    {
                        ::comphelper::ComponentContext aContext( m_pImpl->m_rModel.getController()->getORB() );
                        OSL_VERIFY( aContext.createComponent( "com.sun.star.beans.Introspection", m_pImpl->m_xIntrospection ) );
                    }
                    if ( m_pImpl->m_xIntrospection.is() )
                    {
                        Reference< XIntrospectionAccess > xIntrospection(
                            m_pImpl->m_xIntrospection->inspect( makeAny( _rEvent.Source ) ),
                            UNO_SET_THROW
                        );
                        rObjectInfo.xPropertyIntrospection.set( xIntrospection->queryAdapter( XPropertySet::static_type() ), UNO_QUERY_THROW );
                    }
                }
                if ( rObjectInfo.xPropertyIntrospection.is() )
                {
                    xPSI.set( rObjectInfo.xPropertyIntrospection->getPropertySetInfo(), UNO_SET_THROW );
                    nPropertyAttributes = xPSI->getPropertyByName( _rEvent.PropertyName ).Attributes;
                }
            }
        }
        catch( const Exception& )
        {
        	DBG_UNHANDLED_EXCEPTION();
        }
		const bool bTransReadOnly =
                    ( ( nPropertyAttributes & PropertyAttribute::READONLY ) != 0 )
                ||  ( ( nPropertyAttributes & PropertyAttribute::TRANSIENT ) != 0 );

		// insert the new entry
		aPropertyPos = rObjectInfo.aProperties.insert( PropertiesInfo::value_type(
            _rEvent.PropertyName,
            PropertyInfo( bTransReadOnly )
        ) ).first;
		DBG_ASSERT(aPropertyPos != rObjectInfo.aProperties.end(), "OXUndoEnvironment::propertyChange : just inserted it ... why it's not there ?");
	}

	implSetModified();

	// now we have access to the cached info about the property affected
	// and are able to decide wether or not we need an undo action

	// no UNDO for transient/readonly properties
	if ( aPropertyPos->second.bIsReadonlyOrTransient )
        return;

    // give components with sub responsibilities a chance
    m_pImpl->m_aFormatNormalizer.notifyPropertyChange( _rEvent );
    m_pImpl->m_aConditionUpdater.notifyPropertyChange( _rEvent );

    aGuard.clear();
	// TODO: this is a potential race condition: two threads here could in theory
	// add their undo actions out-of-order

    ::vos::OClearableGuard aSolarGuard( Application::GetSolarMutex() );
    ORptUndoPropertyAction* pUndo = NULL;
    try
    {
        uno::Reference< report::XSection> xSection( xSet, uno::UNO_QUERY );
        if ( xSection.is() )
        {
            uno::Reference< report::XGroup> xGroup = xSection->getGroup();
            if ( xGroup.is() )
                pUndo = new OUndoPropertyGroupSectionAction( m_pImpl->m_rModel, _rEvent, OGroupHelper::getMemberFunction( xSection ), xGroup );
            else
                pUndo = new OUndoPropertyReportSectionAction( m_pImpl->m_rModel, _rEvent, OReportHelper::getMemberFunction( xSection ), xSection->getReportDefinition() );
        }
    }
    catch(const Exception&)
    {
        DBG_UNHANDLED_EXCEPTION();
    }

    if ( pUndo == NULL )
        pUndo = new ORptUndoPropertyAction( m_pImpl->m_rModel, _rEvent );

    m_pImpl->m_rModel.GetSdrUndoManager()->AddUndoAction( pUndo );
    pController->InvalidateAll();
}
// -----------------------------------------------------------------------------
::std::vector< uno::Reference< container::XChild> >::const_iterator OXUndoEnvironment::getSection(const Reference<container::XChild>& _xContainer) const
{
    ::std::vector< uno::Reference< container::XChild> >::const_iterator aFind = m_pImpl->m_aSections.end();
    if ( _xContainer.is() )
    {
        aFind = ::std::find(m_pImpl->m_aSections.begin(),m_pImpl->m_aSections.end(),_xContainer);

	    if ( aFind == m_pImpl->m_aSections.end() )
	    {
            Reference<container::XChild> xParent(_xContainer->getParent(),uno::UNO_QUERY);
            aFind = getSection(xParent);
        }
    }
    return aFind;
}
// XContainerListener
//------------------------------------------------------------------------------
void SAL_CALL OXUndoEnvironment::elementInserted(const ContainerEvent& evt) throw(uno::RuntimeException)
{
	::vos::OClearableGuard aSolarGuard( Application::GetSolarMutex() );
    ::osl::MutexGuard aGuard( m_pImpl->m_aMutex );

	// neues Object zum lauschen
	Reference< uno::XInterface >  xIface( evt.Element, UNO_QUERY );
	if ( !IsLocked() )
    {
        Reference< report::XReportComponent >  xReportComponent( xIface, UNO_QUERY );
        if ( xReportComponent.is() )
	    {
            Reference< report::XSection > xContainer(evt.Source,uno::UNO_QUERY);

		    ::std::vector< uno::Reference< container::XChild> >::const_iterator aFind = getSection(xContainer.get());

		    if ( aFind != m_pImpl->m_aSections.end() )
		    {
                OUndoEnvLock aLock(*this);
                try
                {
                    OReportPage* pPage = m_pImpl->m_rModel.getPage(uno::Reference< report::XSection>(*aFind,uno::UNO_QUERY));
                    OSL_ENSURE(pPage,"No page could be found for section!");
                    if ( pPage )
			            pPage->insertObject(xReportComponent);
                }
                catch(uno::Exception&)
                {
                    DBG_UNHANDLED_EXCEPTION();
                }

		    }
	    }
        else
        {
            uno::Reference< report::XFunctions> xContainer(evt.Source,uno::UNO_QUERY);
            if ( xContainer.is() )
            {
                m_pImpl->m_rModel.GetSdrUndoManager()->AddUndoAction(
                    new OUndoContainerAction( m_pImpl->m_rModel, rptui::Inserted, xContainer.get(),
                        xIface, RID_STR_UNDO_ADDFUNCTION ) );
            }
        }
    }

	AddElement(xIface);

	implSetModified();
}

//------------------------------------------------------------------------------
void OXUndoEnvironment::implSetModified()
{
	//if ( !IsLocked() )
	m_pImpl->m_rModel.SetModified( sal_True );
}

//------------------------------------------------------------------------------
void SAL_CALL OXUndoEnvironment::elementReplaced(const ContainerEvent& evt) throw(uno::RuntimeException)
{
	::vos::OClearableGuard aSolarGuard( Application::GetSolarMutex() );
    ::osl::MutexGuard aGuard( m_pImpl->m_aMutex );

    Reference< XInterface >  xIface(evt.ReplacedElement,uno::UNO_QUERY);
	OSL_ENSURE(xIface.is(), "OXUndoEnvironment::elementReplaced: invalid container notification!");
	RemoveElement(xIface);

    xIface.set(evt.Element,uno::UNO_QUERY);
	AddElement(xIface);

    implSetModified();
}

//------------------------------------------------------------------------------
void SAL_CALL OXUndoEnvironment::elementRemoved(const ContainerEvent& evt) throw(uno::RuntimeException)
{
	::vos::OClearableGuard aSolarGuard( Application::GetSolarMutex() );
    ::osl::MutexGuard aGuard( m_pImpl->m_aMutex );

    Reference< uno::XInterface >  xIface( evt.Element, UNO_QUERY );
    if ( !IsLocked() )
    {
	    Reference< report::XSection > xContainer(evt.Source,uno::UNO_QUERY);
	    ::std::vector< uno::Reference< container::XChild> >::const_iterator aFind = getSection(xContainer.get());

        Reference< report::XReportComponent >  xReportComponent( xIface, UNO_QUERY );
	    if ( aFind != m_pImpl->m_aSections.end() && xReportComponent.is() )
	    {
            OXUndoEnvironment::OUndoEnvLock aLock(*this);
            try
            {
                OReportPage* pPage = m_pImpl->m_rModel.getPage(uno::Reference< report::XSection >( *aFind, uno::UNO_QUERY_THROW ) );
                OSL_ENSURE( pPage, "OXUndoEnvironment::elementRemoved: no page for the section!" );
                if ( pPage )
			        pPage->removeSdrObject(xReportComponent);
            }
            catch(const uno::Exception&)
            {
                DBG_UNHANDLED_EXCEPTION();
            }
	    }
        else
        {
            uno::Reference< report::XFunctions> xFunctions(evt.Source,uno::UNO_QUERY);
            if ( xFunctions.is() )
            {
                m_pImpl->m_rModel.GetSdrUndoManager()->AddUndoAction( new OUndoContainerAction(
                    m_pImpl->m_rModel, rptui::Removed, xFunctions.get(), xIface, RID_STR_UNDO_ADDFUNCTION ) );
            }
        }
    }

	if ( xIface.is() )
		RemoveElement(xIface);

	implSetModified();
}

//------------------------------------------------------------------------------
void SAL_CALL OXUndoEnvironment::modified( const EventObject& /*aEvent*/ ) throw (RuntimeException)
{
    implSetModified();
}

//------------------------------------------------------------------------------
void OXUndoEnvironment::AddSection(const Reference< report::XSection > & _xSection)
{
	OUndoEnvLock aLock(*this);
    try
    {
	    uno::Reference<container::XChild> xChild = _xSection.get();
	    uno::Reference<report::XGroup> xGroup(xChild->getParent(),uno::UNO_QUERY);
	    m_pImpl->m_aSections.push_back(xChild);
	    Reference< XInterface >  xInt(_xSection);
	    AddElement(xInt);
    }
    catch(const uno::Exception&)
    {
        DBG_UNHANDLED_EXCEPTION();
    }
}

//------------------------------------------------------------------------------
void OXUndoEnvironment::RemoveSection(const Reference< report::XSection > & _xSection)
{
	OUndoEnvLock aLock(*this);
    try
    {
	    uno::Reference<container::XChild> xChild(_xSection.get());
	    m_pImpl->m_aSections.erase(::std::remove(m_pImpl->m_aSections.begin(),m_pImpl->m_aSections.end(),
		    xChild), m_pImpl->m_aSections.end());
	    Reference< XInterface >  xInt(_xSection);
	    RemoveElement(xInt);
    }
    catch(uno::Exception&){}
}

//------------------------------------------------------------------------------
void OXUndoEnvironment::TogglePropertyListening(const Reference< XInterface > & Element)
{
	// am Container horchen
	Reference< XIndexAccess >  xContainer(Element, UNO_QUERY);
	if (xContainer.is())
	{
		Reference< XInterface > xInterface;
		sal_Int32 nCount = xContainer->getCount();
		for(sal_Int32 i = 0;i != nCount;++i)
		{
			xInterface.set(xContainer->getByIndex( i ),uno::UNO_QUERY);
			TogglePropertyListening(xInterface);
		}
	}

	Reference< XPropertySet >  xSet(Element, UNO_QUERY);
	if (xSet.is())
	{
		if (!m_pImpl->m_bReadOnly)
			xSet->addPropertyChangeListener( ::rtl::OUString(), this );
		else
			xSet->removePropertyChangeListener( ::rtl::OUString(), this );
	}
}


//------------------------------------------------------------------------------
void OXUndoEnvironment::switchListening( const Reference< XIndexAccess >& _rxContainer, bool _bStartListening ) SAL_THROW(())
{
    OSL_PRECOND( _rxContainer.is(), "OXUndoEnvironment::switchListening: invalid container!" );
    if ( !_rxContainer.is() )
        return;

    try
    {
        // also handle all children of this element
		Reference< XInterface > xInterface;
        sal_Int32 nCount = _rxContainer->getCount();
		for(sal_Int32 i = 0;i != nCount;++i)
		{
			xInterface.set(_rxContainer->getByIndex( i ),uno::UNO_QUERY);
            if ( _bStartListening )
		        AddElement( xInterface );
            else
		        RemoveElement( xInterface );
	    }

        // be notified of any changes in the container elements
	    Reference< XContainer > xSimpleContainer( _rxContainer, UNO_QUERY );
        // OSL_ENSURE( xSimpleContainer.is(), "OXUndoEnvironment::switchListening: how are we expected to be notified of changes in the container?" );
	    if ( xSimpleContainer.is() )
        {
            if ( _bStartListening )
		        xSimpleContainer->addContainerListener( this );
            else
		        xSimpleContainer->removeContainerListener( this );
        }
    }
    catch( const Exception& )
    {
    	DBG_UNHANDLED_EXCEPTION();
    }
}

//------------------------------------------------------------------------------
void OXUndoEnvironment::switchListening( const Reference< XInterface >& _rxObject, bool _bStartListening ) SAL_THROW(())
{
    OSL_PRECOND( _rxObject.is(), "OXUndoEnvironment::switchListening: how should I listen at a NULL object?" );

    try
    {
        if ( !m_pImpl->m_bReadOnly )
        {
            Reference< XPropertySet > xProps( _rxObject, UNO_QUERY );
	        if ( xProps.is() )
            {
                if ( _bStartListening )
    		        xProps->addPropertyChangeListener( ::rtl::OUString(), this );
                else
    	    	    xProps->removePropertyChangeListener( ::rtl::OUString(), this );
            }
        }

        Reference< XModifyBroadcaster > xBroadcaster( _rxObject, UNO_QUERY );
        if ( xBroadcaster.is() )
        {
            if ( _bStartListening )
                xBroadcaster->addModifyListener( this );
            else
                xBroadcaster->removeModifyListener( this );
        }
    }
    catch( const Exception& )
    {
    	//OSL_ENSURE( sal_False, "OXUndoEnvironment::switchListening: caught an exception!" );
    }
}

//------------------------------------------------------------------------------
void OXUndoEnvironment::AddElement(const Reference< XInterface >& _rxElement )
{
	if ( !IsLocked() )
		m_pImpl->m_aFormatNormalizer.notifyElementInserted( _rxElement );

    // if it's a container, start listening at all elements
    Reference< XIndexAccess > xContainer( _rxElement, UNO_QUERY );
	if ( xContainer.is() )
        switchListening( xContainer, true );

    switchListening( _rxElement, true );
}

//------------------------------------------------------------------------------
void OXUndoEnvironment::RemoveElement(const Reference< XInterface >& _rxElement)
{
    uno::Reference<beans::XPropertySet> xProp(_rxElement,uno::UNO_QUERY);
    if (!m_pImpl->m_aPropertySetCache.empty())
        m_pImpl->m_aPropertySetCache.erase(xProp);
    switchListening( _rxElement, false );

	Reference< XIndexAccess > xContainer( _rxElement, UNO_QUERY );
    if ( xContainer.is() )
        switchListening( xContainer, false );
}

void OXUndoEnvironment::SetUndoMode(sal_Bool _bUndo)
{
    m_pImpl->m_bIsUndo = _bUndo;
}

sal_Bool OXUndoEnvironment::IsUndoMode() const
{
    return m_pImpl->m_bIsUndo;
}
//============================================================================
} // rptui
//============================================================================