AOO410/main/accessibility/source/standard/vclxaccessiblelist.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
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
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 * Unless required by applicable law or agreed to in writing,
 * 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_accessibility.hxx"
#include <accessibility/standard/vclxaccessiblelist.hxx>
#include <accessibility/standard/vclxaccessiblelistitem.hxx>
#include <accessibility/helper/listboxhelper.hxx>

#include <unotools/accessiblestatesethelper.hxx>
#include <com/sun/star/accessibility/AccessibleStateType.hpp>
#include <com/sun/star/accessibility/AccessibleEventId.hpp>
#include <com/sun/star/accessibility/AccessibleRole.hpp>
#include <vcl/svapp.hxx>
#include <vcl/combobox.hxx>
#include <vcl/lstbox.hxx>
#include <toolkit/helper/convert.hxx>

#ifndef _UTL_ACCESSIBLERELATIONSETHELPER_HXX_
#include <unotools/accessiblerelationsethelper.hxx>
#endif
#ifndef _COM_SUN_STAR_ACCESSIBILITY_ACCESSIBLERELATIONTYPE_HPP_
#include <com/sun/star/accessibility/AccessibleRelationType.hpp>
#endif
using namespace ::com::sun::star;
using namespace ::com::sun::star::uno;
using namespace ::com::sun::star::lang;
using namespace ::com::sun::star::beans;
using namespace ::com::sun::star::accessibility;
using namespace ::accessibility;

namespace
{
	void checkSelection_Impl( sal_Int32 _nIndex, const IComboListBoxHelper& _rListBox, sal_Bool bSelected )
        throw (::com::sun::star::lang::IndexOutOfBoundsException)
	{
		sal_Int32 nCount = bSelected ? (sal_Int32)_rListBox.GetSelectEntryCount()
									 : (sal_Int32)_rListBox.GetEntryCount();
		if ( _nIndex < 0 || _nIndex >= nCount )
			throw ::com::sun::star::lang::IndexOutOfBoundsException();
	}
}

VCLXAccessibleList::VCLXAccessibleList (VCLXWindow* pVCLWindow, BoxType aBoxType,
										const Reference< XAccessible >& _xParent)
    : VCLXAccessibleComponent	(pVCLWindow),
      m_aBoxType				(aBoxType),
      m_nVisibleLineCount		(0),
      m_nIndexInParent			(DEFAULT_INDEX_IN_PARENT),
	  m_nLastTopEntry			( 0 ),
	  m_nLastSelectedPos		( LISTBOX_ENTRY_NOTFOUND ),
	  m_bDisableProcessEvent	( false ),
	  m_bVisible				( true ),
	m_nCurSelectedPos		( LISTBOX_ENTRY_NOTFOUND ),
      m_xParent                 ( _xParent )
{
    // Because combo boxes and list boxes have the no common interface for
    // methods with identical signature we have to write down twice the
    // same code.
    switch (m_aBoxType)
    {
        case COMBOBOX:
        {
            ComboBox* pBox = static_cast<ComboBox*>(GetWindow());
            if ( pBox != NULL )
                m_pListBoxHelper = new VCLListBoxHelper<ComboBox> (*pBox);
            break;
        }

        case LISTBOX:
        {
            ListBox* pBox = static_cast<ListBox*>(GetWindow());
            if ( pBox != NULL )
                m_pListBoxHelper = new VCLListBoxHelper<ListBox> (*pBox);
            break;
        }
    }
    UpdateVisibleLineCount();
	m_nCurSelectedPos=m_pListBoxHelper->GetSelectEntryPos();

	sal_uInt16 nCount = static_cast<sal_uInt16>(getAccessibleChildCount());
	m_aAccessibleChildren.reserve(nCount);
}
// -----------------------------------------------------------------------------

VCLXAccessibleList::~VCLXAccessibleList (void)
{
    delete m_pListBoxHelper;
}
// -----------------------------------------------------------------------------

void VCLXAccessibleList::SetIndexInParent (sal_Int32 nIndex)
{
    m_nIndexInParent = nIndex;
}
// -----------------------------------------------------------------------------

void SAL_CALL VCLXAccessibleList::disposing (void)
{
	VCLXAccessibleComponent::disposing();

    // Dispose all items in the list.
	clearItems();

	delete m_pListBoxHelper;
	m_pListBoxHelper = NULL;
}
// -----------------------------------------------------------------------------

void VCLXAccessibleList::clearItems()
{
//	ListItems::iterator aEnd = m_aAccessibleChildren.end();
//	for (ListItems::iterator aIter = m_aAccessibleChildren.begin(); aIter != aEnd; ++aIter)
//		::comphelper::disposeComponent(*aIter);

    // Clear the list itself and delete all the rest.
	ListItems().swap(m_aAccessibleChildren); // clear and minimize
}
// -----------------------------------------------------------------------------

void VCLXAccessibleList::FillAccessibleStateSet (utl::AccessibleStateSetHelper& rStateSet)
{
	vos::OGuard aSolarGuard( Application::GetSolarMutex() );

	VCLXAccessibleComponent::FillAccessibleStateSet( rStateSet );
	// check if our list should be visible
	if (	m_pListBoxHelper 
		&& (m_pListBoxHelper->GetStyle() & WB_DROPDOWN ) == WB_DROPDOWN 
		&& !m_pListBoxHelper->IsInDropDown() )
	{
		rStateSet.RemoveState (AccessibleStateType::VISIBLE);
		rStateSet.RemoveState (AccessibleStateType::SHOWING);
		m_bVisible = false;
	}

    // Both the combo box and list box are handled identical in the
    // following but for some reason they don't have a common interface for
    // the methods used.
	if ( m_pListBoxHelper )
	{
        if ( m_pListBoxHelper->IsMultiSelectionEnabled() )
            rStateSet.AddState( AccessibleStateType::MULTI_SELECTABLE);
		rStateSet.AddState (AccessibleStateType::FOCUSABLE);
        // All children are transient.
        rStateSet.AddState (AccessibleStateType::MANAGES_DESCENDANTS);
	}
}
// -----------------------------------------------------------------------------
void VCLXAccessibleList::notifyVisibleStates(sal_Bool _bSetNew )
{
	m_bVisible = _bSetNew ? true : false;
	Any aOldValue, aNewValue;
	(_bSetNew ? aNewValue : aOldValue ) <<= AccessibleStateType::VISIBLE;
	NotifyAccessibleEvent( AccessibleEventId::STATE_CHANGED, aOldValue, aNewValue );
	(_bSetNew ? aNewValue : aOldValue ) <<= AccessibleStateType::SHOWING;
	NotifyAccessibleEvent( AccessibleEventId::STATE_CHANGED, aOldValue, aNewValue );

	ListItems::iterator aIter = m_aAccessibleChildren.begin();
	ListItems::iterator aEnd = m_aAccessibleChildren.end();
    UpdateVisibleLineCount();
	// adjust the index inside the VCLXAccessibleListItem
	for (;aIter != aEnd ; ++aIter)
	{
		Reference< XAccessible > xHold = *aIter;
		VCLXAccessibleListItem* pItem = static_cast<VCLXAccessibleListItem*>(xHold.get());
		if ( pItem )
		{
			sal_uInt16 nTopEntry = 0;
			if ( m_pListBoxHelper )
				nTopEntry = m_pListBoxHelper->GetTopEntry();
            sal_uInt16 nPos = (sal_uInt16)(aIter - m_aAccessibleChildren.begin());
			sal_Bool bVisible = ( nPos>=nTopEntry && nPos<( nTopEntry + m_nVisibleLineCount ) );
			pItem->SetVisible( m_bVisible && bVisible );
		}
			
	}
}
// -----------------------------------------------------------------------------
void VCLXAccessibleList::UpdateSelection_Acc (::rtl::OUString sTextOfSelectedItem, bool b_IsDropDownList)
{
    if ( m_aBoxType == COMBOBOX )
    {
        ComboBox* pBox = static_cast<ComboBox*>(GetWindow());
        if ( pBox != NULL )
        {
		// Find the index of the selected item inside the VCL control...
		sal_uInt16 nIndex = pBox->GetEntryPos (XubString(sTextOfSelectedItem));
		// ...and then find the associated accessibility object.
		if ( nIndex == LISTBOX_ENTRY_NOTFOUND )
			nIndex = 0;
		UpdateSelection_Impl_Acc(b_IsDropDownList);
        }
    }
}

// -----------------------------------------------------------------------------
void VCLXAccessibleList::UpdateSelection_Impl_Acc(bool b_IsDropDownList)
{
	uno::Any aOldValue, aNewValue;
	VCLXAccessibleListItem* pCurItem =NULL;
	
	{
		vos::OGuard aSolarGuard( Application::GetSolarMutex() );
		::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );
	    	Reference< XAccessible > xNewAcc;
		if ( m_pListBoxHelper )
		{
			sal_uInt16 i=0;
			m_nCurSelectedPos = LISTBOX_ENTRY_NOTFOUND;
			for ( ListItems::iterator aIter = m_aAccessibleChildren.begin();
				  aIter != m_aAccessibleChildren.end(); ++aIter,++i)
			{
				Reference< XAccessible > xHold = *aIter;
				if ( xHold.is() )
				{
					VCLXAccessibleListItem* pItem = static_cast< VCLXAccessibleListItem* >( xHold.get() );
					// Retrieve the item's index from the list entry.
					sal_Bool bNowSelected = m_pListBoxHelper->IsEntryPosSelected (i);
					if (bNowSelected)
						m_nCurSelectedPos = i;
						
					if ( bNowSelected && !pItem->IsSelected() )
					{
						xNewAcc = *aIter;
						aNewValue <<= xNewAcc;

						pCurItem = pItem;

					}
					else if ( pItem->IsSelected() )
						m_nLastSelectedPos = i;

					pItem->SetSelected( bNowSelected );
				}
				else
				{ // it could happen that a child was not created before
					checkEntrySelected(i,aNewValue,xNewAcc);
				}
			}
			sal_uInt16 nCount = m_pListBoxHelper->GetEntryCount();
			if ( i < nCount ) // here we have to check the if any other listbox entry is selected
			{
				for (; i < nCount && !checkEntrySelected(i,aNewValue,xNewAcc) ;++i )
					;
			}
			if ( xNewAcc.is() && GetWindow()->HasFocus() )
			{
				if ( m_nLastSelectedPos != LISTBOX_ENTRY_NOTFOUND )
					aOldValue <<= getAccessibleChild( (sal_Int32)m_nLastSelectedPos );
				aNewValue <<= xNewAcc;
			}
		}
	}
	if (m_aBoxType == COMBOBOX && b_IsDropDownList)
	{
		//VCLXAccessibleDropDownComboBox
		//when in list is dropped down, xText = NULL
		if (m_pListBoxHelper->IsInDropDown())
		{
			if ( aNewValue.hasValue() || aOldValue.hasValue() )
			{
				NotifyAccessibleEvent(
					AccessibleEventId::ACTIVE_DESCENDANT_CHANGED,
					aOldValue,
					aNewValue );

				NotifyListItem(aNewValue);

			}
		}
	}
	else if (m_aBoxType == COMBOBOX && !b_IsDropDownList)
	{
		//VCLXAccessibleComboBox
		NotifyAccessibleEvent( AccessibleEventId::SELECTION_CHANGED, uno::Any(), uno::Any() );
	}
	else if (m_aBoxType == LISTBOX && b_IsDropDownList)
	{
		//VCLXAccessibleDropdownListBox
		//when in list is dropped down, xText = NULL
		if (m_pListBoxHelper->IsInDropDown())
		{
			if ( aNewValue.hasValue() || aOldValue.hasValue() )
			{
				NotifyAccessibleEvent(
					AccessibleEventId::ACTIVE_DESCENDANT_CHANGED,
					aOldValue,
					aNewValue );
				
				NotifyListItem(aNewValue);
			}
		}
	}
	else if (m_aBoxType == LISTBOX && !b_IsDropDownList)
	{
		//VCLXAccessibleListBox, xText = NULL. 


		if ( aNewValue.hasValue())
		{
			NotifyListItem(aNewValue);		
		}
	}
}
void VCLXAccessibleList::NotifyListItem(::com::sun::star::uno::Any& val)
{
	Reference< XAccessible > xCurItem;
	val >>= xCurItem;
	if (xCurItem.is())
	{
		VCLXAccessibleListItem* pCurItem = static_cast< VCLXAccessibleListItem* >(xCurItem.get());
		if (pCurItem)
		{
			pCurItem->NotifyAccessibleEvent(AccessibleEventId::SELECTION_CHANGED,Any(),Any());
		}
	}				
}


void VCLXAccessibleList::UpdateFocus_Impl_Acc (sal_uInt16 nPos ,bool b_IsDropDownList)
{	
	if (!(m_aBoxType == LISTBOX && !b_IsDropDownList))
	{
		return ;
	}
    Reference<XAccessible> xChild= CreateChild(nPos);
	if ( !xChild.is() )
	{
		return ;
	}
	m_nCurSelectedPos = nPos;
	uno::Any aOldValue, aNewValue;
	aNewValue <<= xChild;
	
	NotifyAccessibleEvent(
			AccessibleEventId::ACTIVE_DESCENDANT_CHANGED,
			aOldValue,
			aNewValue );
}

// -----------------------------------------------------------------------------
void VCLXAccessibleList::ProcessWindowEvent (const VclWindowEvent& rVclWindowEvent,  bool b_IsDropDownList)
{
	switch ( rVclWindowEvent.GetId() )
      {
		case VCLEVENT_DROPDOWN_SELECT:
		case VCLEVENT_LISTBOX_SELECT:
			if ( !m_bDisableProcessEvent )
				UpdateSelection_Impl_Acc(b_IsDropDownList);
			break;
		case VCLEVENT_LISTBOX_FOCUSITEMCHANGED:
			if ( !m_bDisableProcessEvent )
				UpdateFocus_Impl_Acc((sal_uInt16)reinterpret_cast<sal_uIntPtr>(rVclWindowEvent.GetData()),b_IsDropDownList);
			break;
		case VCLEVENT_WINDOW_GETFOCUS:
			break;
		case VCLEVENT_CONTROL_GETFOCUS:
			{
				VCLXAccessibleComponent::ProcessWindowEvent (rVclWindowEvent);
				if (m_aBoxType == COMBOBOX && b_IsDropDownList)
				{
					//VCLXAccessibleDropDownComboBox				
				}
				else if (m_aBoxType == LISTBOX && b_IsDropDownList)
				{
				}
				else if ( m_aBoxType == LISTBOX && !b_IsDropDownList)
				{
					if ( m_pListBoxHelper )
					{
						uno::Any	aOldValue, 
									aNewValue;
						sal_uInt16 nPos = m_nCurSelectedPos; //m_pListBoxHelper->GetSelectEntryPos();

						if ( nPos == LISTBOX_ENTRY_NOTFOUND )
							nPos = m_pListBoxHelper->GetTopEntry();
						if ( nPos != LISTBOX_ENTRY_NOTFOUND )
							aNewValue <<= CreateChild(nPos);
						NotifyAccessibleEvent(	AccessibleEventId::ACTIVE_DESCENDANT_CHANGED,
												aOldValue,
												aNewValue );
					}
				}
			}
			break;
		default:
			break;
	}	

}
// -----------------------------------------------------------------------------
void VCLXAccessibleList::ProcessWindowEvent (const VclWindowEvent& rVclWindowEvent)
{
    // Create a reference to this object to prevent an early release of the
    // listbox (VCLEVENT_OBJECT_DYING).
	Reference< XAccessible > xTemp = this;

	switch ( rVclWindowEvent.GetId() )
    {
		case VCLEVENT_DROPDOWN_OPEN:
			notifyVisibleStates(sal_True);
			break;
		case VCLEVENT_DROPDOWN_CLOSE:
			notifyVisibleStates(sal_False);
			break;
		case VCLEVENT_LISTBOX_SCROLLED:
		case VCLEVENT_COMBOBOX_SCROLLED:
			UpdateEntryRange_Impl();
			break;

		// The selection events VCLEVENT_COMBOBOX_SELECT and
		// VCLEVENT_COMBOBOX_DESELECT are not handled here because here we
		// have no access to the edit field.  Its text is necessary to
		// identify the currently selected item.

		case VCLEVENT_OBJECT_DYING:
		{
            dispose();

            VCLXAccessibleComponent::ProcessWindowEvent (rVclWindowEvent);
            break;
		}

        case VCLEVENT_LISTBOX_ITEMREMOVED:
        case VCLEVENT_COMBOBOX_ITEMREMOVED:
            HandleChangedItemList (false, reinterpret_cast<sal_IntPtr>(
                rVclWindowEvent.GetData()));
            break;

        case VCLEVENT_LISTBOX_ITEMADDED:
        case VCLEVENT_COMBOBOX_ITEMADDED:
            HandleChangedItemList (true, reinterpret_cast<sal_IntPtr>(
                rVclWindowEvent.GetData()));
            break;
		case VCLEVENT_CONTROL_GETFOCUS:
			{
	            VCLXAccessibleComponent::ProcessWindowEvent (rVclWindowEvent);
				// Added by IBM Symphony Acc team to handle the list item focus when List control get focus
				sal_Bool b_IsDropDownList = sal_True;
				if (m_pListBoxHelper)
					b_IsDropDownList = ((m_pListBoxHelper->GetStyle() & WB_DROPDOWN ) == WB_DROPDOWN);
				if ( m_aBoxType == LISTBOX && !b_IsDropDownList )
				{
					if ( m_pListBoxHelper )
					{
						uno::Any	aOldValue, 
									aNewValue;
						sal_uInt16 nPos = m_nCurSelectedPos; 

						if ( nPos == LISTBOX_ENTRY_NOTFOUND )
							nPos = m_pListBoxHelper->GetTopEntry();
						if ( nPos != LISTBOX_ENTRY_NOTFOUND )
							aNewValue <<= CreateChild(nPos);
						NotifyAccessibleEvent(	AccessibleEventId::ACTIVE_DESCENDANT_CHANGED,
												aOldValue,
												aNewValue );
					}
				}
			}
			break;

        default:
            VCLXAccessibleComponent::ProcessWindowEvent (rVclWindowEvent);
    }
}

 void VCLXAccessibleList::FillAccessibleRelationSet( utl::AccessibleRelationSetHelper& rRelationSet )
{
	ListBox* pBox = static_cast<ListBox*>(GetWindow());
	if( m_aBoxType == LISTBOX  )
	{
		if (m_pListBoxHelper && (m_pListBoxHelper->GetStyle() & WB_DROPDOWN ) != WB_DROPDOWN)
		{
			uno::Sequence< uno::Reference< uno::XInterface > > aSequence(1);
			aSequence[0] = pBox->GetAccessible();
			rRelationSet.AddRelation( com::sun::star::accessibility::AccessibleRelation( com::sun::star::accessibility::AccessibleRelationType::MEMBER_OF, aSequence ) );
		}
	}
	else
	{
		VCLXAccessibleComponent::FillAccessibleRelationSet(rRelationSet);	
	}
}
// -----------------------------------------------------------------------------

/** To find out which item is currently selected and to update the SELECTED
    state of the associated accessibility objects accordingly we exploit the
    fact that the
*/
void VCLXAccessibleList::UpdateSelection (::rtl::OUString sTextOfSelectedItem)
{
    if ( m_aBoxType == COMBOBOX )
    {
        ComboBox* pBox = static_cast<ComboBox*>(GetWindow());
        if ( pBox != NULL )
        {
            // Find the index of the selected item inside the VCL control...
            sal_uInt16 nIndex = pBox->GetEntryPos (XubString(sTextOfSelectedItem));
            // ...and then find the associated accessibility object.
			if ( nIndex == LISTBOX_ENTRY_NOTFOUND )
				nIndex = 0;
			UpdateSelection_Impl(nIndex);
        }
    }
}
// -----------------------------------------------------------------------------

void VCLXAccessibleList::adjustEntriesIndexInParent(ListItems::iterator& _aBegin,::std::mem_fun_t<bool,VCLXAccessibleListItem>& _rMemFun)
{
	ListItems::iterator aIter = _aBegin;
	ListItems::iterator aEnd = m_aAccessibleChildren.end();
	// adjust the index inside the VCLXAccessibleListItem
	for (;aIter != aEnd ; ++aIter)
	{
		Reference< XAccessible > xHold = *aIter;
		VCLXAccessibleListItem* pItem = static_cast<VCLXAccessibleListItem*>(xHold.get());
		if ( pItem )
			_rMemFun(pItem);
	}
}
// -----------------------------------------------------------------------------

Reference<XAccessible> VCLXAccessibleList::CreateChild (sal_Int32 i)
{
    Reference<XAccessible> xChild;

	sal_uInt16 nPos = static_cast<sal_uInt16>(i);
	if ( nPos >= m_aAccessibleChildren.size() )
	{
		m_aAccessibleChildren.resize(nPos + 1);

		// insert into the container
		xChild = new VCLXAccessibleListItem(m_pListBoxHelper, i, this);
		m_aAccessibleChildren[nPos] = xChild;
	}
	else
	{
		xChild = m_aAccessibleChildren[nPos];
		// check if position is empty and can be used else we have to adjust all entries behind this
		if ( !xChild.is() )
		{
			xChild = new VCLXAccessibleListItem(m_pListBoxHelper, i, this);
			m_aAccessibleChildren[nPos] = xChild;
		}
	}

    if ( xChild.is() )
    {
		// Just add the SELECTED state.
		sal_Bool bNowSelected = sal_False;
		if ( m_pListBoxHelper )
			bNowSelected = m_pListBoxHelper->IsEntryPosSelected ((sal_uInt16)i);
		if (bNowSelected)
			m_nCurSelectedPos = sal_uInt16(i);
        VCLXAccessibleListItem* pItem = static_cast< VCLXAccessibleListItem* >(xChild.get());
        pItem->SetSelected( bNowSelected );

		// Set the child's VISIBLE state.
        UpdateVisibleLineCount();
		sal_uInt16 nTopEntry = 0;
		if ( m_pListBoxHelper )
			nTopEntry = m_pListBoxHelper->GetTopEntry();
		sal_Bool bVisible = ( nPos>=nTopEntry && nPos<( nTopEntry + m_nVisibleLineCount ) );
		pItem->SetVisible( m_bVisible && bVisible );
    }

    return xChild;
}
// -----------------------------------------------------------------------------

void VCLXAccessibleList::HandleChangedItemList (bool bItemInserted, sal_Int32 nIndex)
{
	clearItems();	
    NotifyAccessibleEvent (
        AccessibleEventId::INVALIDATE_ALL_CHILDREN,
        Any(), Any());
}
// -----------------------------------------------------------------------------

IMPLEMENT_FORWARD_XINTERFACE2(VCLXAccessibleList, VCLXAccessibleComponent, VCLXAccessibleList_BASE)
IMPLEMENT_FORWARD_XTYPEPROVIDER2(VCLXAccessibleList, VCLXAccessibleComponent, VCLXAccessibleList_BASE)

//=====  XAccessible  =========================================================

Reference<XAccessibleContext> SAL_CALL
    VCLXAccessibleList::getAccessibleContext (void)
    throw (RuntimeException)
{
	return this;
}
// -----------------------------------------------------------------------------

//=====  XAccessibleContext  ==================================================

sal_Int32 SAL_CALL VCLXAccessibleList::getAccessibleChildCount (void)
    throw (RuntimeException)
{
	vos::OGuard aSolarGuard( Application::GetSolarMutex() );
	::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

	sal_Int32 nCount = 0;
	if ( m_pListBoxHelper )
		nCount = m_pListBoxHelper->GetEntryCount();

    return nCount;
}
// -----------------------------------------------------------------------------

Reference<XAccessible> SAL_CALL VCLXAccessibleList::getAccessibleChild (sal_Int32 i)
    throw (IndexOutOfBoundsException, RuntimeException)
{
	vos::OGuard aSolarGuard( Application::GetSolarMutex() );
	::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

	if ( i < 0 || i >= getAccessibleChildCount() )
		throw IndexOutOfBoundsException();

    Reference< XAccessible > xChild;
    // search for the child
	if ( i >= static_cast<sal_Int32>(m_aAccessibleChildren.size()) )
		xChild = CreateChild (i);
	else
	{
		xChild = m_aAccessibleChildren[i];
		if ( !xChild.is() )
			xChild = CreateChild (i);
	}
	OSL_ENSURE( xChild.is(), "VCLXAccessibleList::getAccessibleChild: returning empty child!" );
    return xChild;
}
// -----------------------------------------------------------------------------

Reference< XAccessible > SAL_CALL VCLXAccessibleList::getAccessibleParent(  )
	throw (RuntimeException)
{
	::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

	return m_xParent;
}
// -----------------------------------------------------------------------------

sal_Int32 SAL_CALL VCLXAccessibleList::getAccessibleIndexInParent (void)
    throw (::com::sun::star::uno::RuntimeException)
{
    if (m_nIndexInParent != DEFAULT_INDEX_IN_PARENT)
        return m_nIndexInParent;
    else
        return VCLXAccessibleComponent::getAccessibleIndexInParent();
}
// -----------------------------------------------------------------------------

sal_Int16 SAL_CALL VCLXAccessibleList::getAccessibleRole (void)
    throw (RuntimeException)
{
    return AccessibleRole::LIST;
}
// -----------------------------------------------------------------------------

//=====  XAccessibleComponent  ================================================

sal_Bool SAL_CALL VCLXAccessibleList::contains( const awt::Point& rPoint ) throw (RuntimeException)
{
	vos::OGuard aSolarGuard( Application::GetSolarMutex() );
	::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

	sal_Bool bInside = sal_False;

    Window* pListBox = GetWindow();
    if ( pListBox )
	{
		Rectangle aRect( Point(0,0), pListBox->GetSizePixel() );
		bInside = aRect.IsInside( VCLPoint( rPoint ) );
	}

	return bInside;
}
// -----------------------------------------------------------------------------

Reference< XAccessible > SAL_CALL VCLXAccessibleList::getAccessibleAt( const awt::Point& rPoint )
    throw (RuntimeException)
{
	vos::OGuard aSolarGuard( Application::GetSolarMutex() );
	::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

	Reference< XAccessible > xChild;
	if ( m_pListBoxHelper )
	{
        UpdateVisibleLineCount();
		if ( contains( rPoint ) && m_nVisibleLineCount > 0 )
		{
			Point aPos = VCLPoint( rPoint );
			sal_uInt16 nEndPos = m_pListBoxHelper->GetTopEntry() + (sal_uInt16)m_nVisibleLineCount;
			for ( sal_uInt16 i = m_pListBoxHelper->GetTopEntry(); i < nEndPos; ++i )
			{
				if ( m_pListBoxHelper->GetBoundingRectangle(i).IsInside( aPos ) )
				{
					xChild = getAccessibleChild(i);
					break;
				}
			}
		}
	}

    return xChild;
}
// -----------------------------------------------------------------------------

//===== XServiceInfo ==========================================================

::rtl::OUString VCLXAccessibleList::getImplementationName (void)
    throw (RuntimeException)
{
	return ::rtl::OUString(RTL_CONSTASCII_USTRINGPARAM("com.sun.star.comp.toolkit.AccessibleList"));
}
// -----------------------------------------------------------------------------

Sequence< ::rtl::OUString > VCLXAccessibleList::getSupportedServiceNames (void)
    throw (RuntimeException)
{
	Sequence< ::rtl::OUString > aNames = VCLXAccessibleComponent::getSupportedServiceNames();
	sal_Int32 nLength = aNames.getLength();
	aNames.realloc( nLength + 1 );
	aNames[nLength] = ::rtl::OUString(RTL_CONSTASCII_USTRINGPARAM("com.sun.star.accessibility.AccessibleList"));
	return aNames;
}
// -----------------------------------------------------------------------------

void VCLXAccessibleList::UpdateVisibleLineCount()
{
	if ( m_pListBoxHelper ) 
	{
		if ( (m_pListBoxHelper->GetStyle() & WB_DROPDOWN ) == WB_DROPDOWN )
			m_nVisibleLineCount = m_pListBoxHelper->GetDisplayLineCount();
		else
		{
			sal_uInt16 nCols = 0,
				nLines = 0;
			m_pListBoxHelper->GetMaxVisColumnsAndLines (nCols, nLines);
			m_nVisibleLineCount = nLines;
		}
	}
}

// -----------------------------------------------------------------------------
void VCLXAccessibleList::UpdateEntryRange_Impl()
{
	vos::OGuard aSolarGuard( Application::GetSolarMutex() );
	::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

	sal_Int32 nTop = m_nLastTopEntry;

	if ( m_pListBoxHelper )
		nTop = m_pListBoxHelper->GetTopEntry();
	if ( nTop != m_nLastTopEntry )
	{
        UpdateVisibleLineCount();
		sal_Int32 nBegin = Min( m_nLastTopEntry, nTop );
		sal_Int32 nEnd = Max( m_nLastTopEntry + m_nVisibleLineCount, nTop + m_nVisibleLineCount );
		for (sal_uInt16 i = static_cast<sal_uInt16>(nBegin); (i <= static_cast<sal_uInt16>(nEnd)); ++i)
		{
			sal_Bool bVisible = ( i >= nTop && i < ( nTop + m_nVisibleLineCount ) );
			Reference< XAccessible > xHold;
			if ( i < m_aAccessibleChildren.size() )
				xHold = m_aAccessibleChildren[i];
			else if ( bVisible )
				xHold = CreateChild(i);

			if ( xHold.is() )
				static_cast< VCLXAccessibleListItem* >( xHold.get() )->SetVisible( m_bVisible && bVisible );
		}
	}

	m_nLastTopEntry = nTop;
}
// -----------------------------------------------------------------------------
sal_Bool VCLXAccessibleList::checkEntrySelected(sal_uInt16 _nPos,Any& _rNewValue,Reference< XAccessible >& _rxNewAcc)
{
	OSL_ENSURE(m_pListBoxHelper,"Helper is not valid!");
	sal_Bool bNowSelected = sal_False;
	if ( m_pListBoxHelper )
	{
		bNowSelected = m_pListBoxHelper->IsEntryPosSelected (_nPos);
		if ( bNowSelected )
		{
			_rxNewAcc = CreateChild(_nPos);
			_rNewValue <<= _rxNewAcc;
		}
	}
	return bNowSelected;
}
// -----------------------------------------------------------------------------

void VCLXAccessibleList::UpdateSelection_Impl(sal_uInt16)
{
	uno::Any aOldValue, aNewValue;

	{
		vos::OGuard aSolarGuard( Application::GetSolarMutex() );
		::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );
	    Reference< XAccessible > xNewAcc;

		if ( m_pListBoxHelper )
		{
			sal_uInt16 i=0;
			m_nCurSelectedPos = LISTBOX_ENTRY_NOTFOUND;
			for ( ListItems::iterator aIter = m_aAccessibleChildren.begin();
				  aIter != m_aAccessibleChildren.end(); ++aIter,++i)
			{
				Reference< XAccessible > xHold = *aIter;
				if ( xHold.is() )
				{
					VCLXAccessibleListItem* pItem = static_cast< VCLXAccessibleListItem* >( xHold.get() );
					// Retrieve the item's index from the list entry.
					sal_Bool bNowSelected = m_pListBoxHelper->IsEntryPosSelected (i);
					if (bNowSelected)
						m_nCurSelectedPos = i;

					if ( bNowSelected && !pItem->IsSelected() )
					{
						xNewAcc = *aIter;
						aNewValue <<= xNewAcc;
					}
					else if ( pItem->IsSelected() )
						m_nLastSelectedPos = i;

					pItem->SetSelected( bNowSelected );
				}
				else
				{ // it could happen that a child was not created before
					checkEntrySelected(i,aNewValue,xNewAcc);
				}
			}
			sal_uInt16 nCount = m_pListBoxHelper->GetEntryCount();
			if ( i < nCount ) // here we have to check the if any other listbox entry is selected
			{
				for (; i < nCount && !checkEntrySelected(i,aNewValue,xNewAcc) ;++i )
					;
			}
			if ( xNewAcc.is() && GetWindow()->HasFocus() )
			{
				if ( m_nLastSelectedPos != LISTBOX_ENTRY_NOTFOUND )
					aOldValue <<= getAccessibleChild( (sal_Int32)m_nLastSelectedPos );
				aNewValue <<= xNewAcc;
			}
		}
	}
	if (!m_pListBoxHelper->IsInDropDown())
	{
	}
	else
	{
		if ( aNewValue.hasValue() || aOldValue.hasValue() )
			NotifyAccessibleEvent(
				AccessibleEventId::ACTIVE_DESCENDANT_CHANGED,
				aOldValue,
				aNewValue );
		//the SELECTION_CHANGED is not necessary
		//NotifyAccessibleEvent( AccessibleEventId::SELECTION_CHANGED, Any(), Any() );
	}
}

// -----------------------------------------------------------------------------
// XAccessibleSelection
// -----------------------------------------------------------------------------
void SAL_CALL VCLXAccessibleList::selectAccessibleChild( sal_Int32 nChildIndex ) throw (IndexOutOfBoundsException, RuntimeException)
{
	sal_Bool bNotify = sal_False;

	{
		vos::OGuard aSolarGuard( Application::GetSolarMutex() );
		::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

		if ( m_pListBoxHelper )
		{
			checkSelection_Impl(nChildIndex,*m_pListBoxHelper,sal_False);

			m_pListBoxHelper->SelectEntryPos( (sal_uInt16)nChildIndex, sal_True );
			// call the select handler, don't handle events in this time
			m_bDisableProcessEvent = true;
			m_pListBoxHelper->Select();
			m_bDisableProcessEvent = false;
			bNotify = sal_True;
		}
	}

	if ( bNotify )
        UpdateSelection_Impl();
}
// -----------------------------------------------------------------------------
sal_Bool SAL_CALL VCLXAccessibleList::isAccessibleChildSelected( sal_Int32 nChildIndex ) throw (IndexOutOfBoundsException, RuntimeException)
{
	vos::OGuard aSolarGuard( Application::GetSolarMutex() );
	::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

    sal_Bool bRet = sal_False;
	if ( m_pListBoxHelper )
	{
		checkSelection_Impl(nChildIndex,*m_pListBoxHelper,sal_False);

    	bRet = m_pListBoxHelper->IsEntryPosSelected( (sal_uInt16)nChildIndex );
	}
    return bRet;
}
// -----------------------------------------------------------------------------
void SAL_CALL VCLXAccessibleList::clearAccessibleSelection(  ) throw (RuntimeException)
{
	sal_Bool bNotify = sal_False;

	{
		vos::OGuard aSolarGuard( Application::GetSolarMutex() );
		::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

		if ( m_pListBoxHelper )
		{
	    	m_pListBoxHelper->SetNoSelection();
			bNotify = sal_True;
		}
	}

	if ( bNotify )
        UpdateSelection_Impl();
}
// -----------------------------------------------------------------------------
void SAL_CALL VCLXAccessibleList::selectAllAccessibleChildren(  ) throw (RuntimeException)
{
	sal_Bool bNotify = sal_False;

	{
		vos::OGuard aSolarGuard( Application::GetSolarMutex() );
		::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

		if ( m_pListBoxHelper )
		{
	    	sal_uInt16 nCount = m_pListBoxHelper->GetEntryCount();
	    	for ( sal_uInt16 i = 0; i < nCount; ++i )
	    		m_pListBoxHelper->SelectEntryPos( i, sal_True );
			// call the select handler, don't handle events in this time
			m_bDisableProcessEvent = true;
			m_pListBoxHelper->Select();
			m_bDisableProcessEvent = false;
			bNotify = sal_True;
		}
	}

	if ( bNotify )
        UpdateSelection_Impl();
}
// -----------------------------------------------------------------------------
sal_Int32 SAL_CALL VCLXAccessibleList::getSelectedAccessibleChildCount(  ) throw (RuntimeException)
{
	vos::OGuard aSolarGuard( Application::GetSolarMutex() );
	::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

    sal_Int32 nCount = 0;
	if ( m_pListBoxHelper )
   		nCount = m_pListBoxHelper->GetSelectEntryCount();
    return nCount;
}
// -----------------------------------------------------------------------------
Reference< XAccessible > SAL_CALL VCLXAccessibleList::getSelectedAccessibleChild( sal_Int32 nSelectedChildIndex ) throw (IndexOutOfBoundsException, RuntimeException)
{
	vos::OGuard aSolarGuard( Application::GetSolarMutex() );
	::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

	if ( m_pListBoxHelper )
	{
		checkSelection_Impl(nSelectedChildIndex,*m_pListBoxHelper,sal_True);
		return getAccessibleChild( (sal_Int32)m_pListBoxHelper->GetSelectEntryPos( (sal_uInt16)nSelectedChildIndex ) );
	}

	return NULL;
}
// -----------------------------------------------------------------------------
void SAL_CALL VCLXAccessibleList::deselectAccessibleChild( sal_Int32 nSelectedChildIndex ) throw (IndexOutOfBoundsException, RuntimeException)
{
	sal_Bool bNotify = sal_False;

	{
		vos::OGuard aSolarGuard( Application::GetSolarMutex() );
		::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

		if ( m_pListBoxHelper )
		{
			checkSelection_Impl(nSelectedChildIndex,*m_pListBoxHelper,sal_False);

			m_pListBoxHelper->SelectEntryPos( (sal_uInt16)nSelectedChildIndex, sal_False );
			// call the select handler, don't handle events in this time
			m_bDisableProcessEvent = true;
			m_pListBoxHelper->Select();
			m_bDisableProcessEvent = false;
			bNotify = sal_True;
		}
	}

	if ( bNotify )
        UpdateSelection_Impl();
}
// -----------------------------------------------------------------------------
// accessibility::XAccessibleComponent
awt::Rectangle VCLXAccessibleList::implGetBounds() throw (uno::RuntimeException)
{
	awt::Rectangle aBounds ( 0, 0, 0, 0 );
	if ( m_pListBoxHelper 
		&& (m_pListBoxHelper->GetStyle() & WB_DROPDOWN ) == WB_DROPDOWN )
	{
		if ( m_pListBoxHelper->IsInDropDown() )
			aBounds = AWTRectangle(m_pListBoxHelper->GetDropDownPosSizePixel());
	}
	else
	{
		// a list has the same bounds as his parent but starts at (0,0)
		aBounds = VCLXAccessibleComponent::implGetBounds();
		aBounds.X = 0;
		aBounds.Y = 0;
		if ( m_aBoxType == COMBOBOX )
		{
			ComboBox* pBox = static_cast<ComboBox*>(GetWindow());
			if ( pBox )
			{
				Size aSize = pBox->GetSubEdit()->GetSizePixel();
				aBounds.Y += aSize.Height();
				aBounds.Height -= aSize.Height();
			}
		}
	}
	return aBounds;
}
// -----------------------------------------------------------------------------

awt::Point VCLXAccessibleList::getLocationOnScreen(  ) throw (uno::RuntimeException)
{
	vos::OGuard aSolarGuard( Application::GetSolarMutex() );
	::osl::Guard< ::osl::Mutex > aGuard( GetMutex() );

	awt::Point aPos;
	if ( m_pListBoxHelper 
		&& (m_pListBoxHelper->GetStyle() & WB_DROPDOWN ) == WB_DROPDOWN )
	{
		if ( m_pListBoxHelper->IsInDropDown() )
			aPos = AWTPoint(m_pListBoxHelper->GetDropDownPosSizePixel().TopLeft());
	}
	else
	{
		aPos = VCLXAccessibleComponent::getLocationOnScreen();
		if ( m_aBoxType == COMBOBOX )
		{
			ComboBox* pBox = static_cast<ComboBox*>(GetWindow());
			if ( pBox )
			{
				aPos.Y += pBox->GetSubEdit()->GetSizePixel().Height();
			}
		}
	}
	return aPos;
}
// -----------------------------------------------------------------------------
sal_Bool	VCLXAccessibleList::IsInDropDown() 
{
	return m_pListBoxHelper->IsInDropDown();
}
// -----------------------------------------------------------------------------
void VCLXAccessibleList::HandleDropOpen()
{
	if ( !m_bDisableProcessEvent )
		UpdateSelection_Impl();
	if (m_nCurSelectedPos != LISTBOX_ENTRY_NOTFOUND &&
		m_nLastSelectedPos != LISTBOX_ENTRY_NOTFOUND)
	{
		Reference< XAccessible > xChild = getAccessibleChild(m_nCurSelectedPos);
		if(xChild.is())
		{
			uno::Any aNewValue;
			aNewValue <<= xChild;
			NotifyAccessibleEvent(AccessibleEventId::ACTIVE_DESCENDANT_CHANGED,	uno::Any(), aNewValue );
		}
	}
}