/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   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 .
 */

#include <sal/config.h>

#include <cstdlib>
#include <memory>
#include <mutex>
#include <utility>
#include <algorithm>
#include <sal/log.hxx>
#include <com/sun/star/uno/Any.hxx>
#include <com/sun/star/uno/Reference.hxx>
#include <com/sun/star/awt/Point.hpp>
#include <com/sun/star/awt/Rectangle.hpp>
#include <com/sun/star/lang/IndexOutOfBoundsException.hpp>
#include <com/sun/star/accessibility/AccessibleEventId.hpp>
#include <com/sun/star/accessibility/XAccessible.hpp>
#include <com/sun/star/accessibility/XAccessibleContext.hpp>
#include <com/sun/star/accessibility/XAccessibleComponent.hpp>
#include <com/sun/star/accessibility/AccessibleStateType.hpp>
#include <comphelper/accessibleeventnotifier.hxx>
#include <vcl/svapp.hxx>
#include <vcl/textdata.hxx>


// Project-local header


#include "AccessibleTextEventQueue.hxx"
#include <svx/AccessibleTextHelper.hxx>

#include <editeng/unoedhlp.hxx>
#include <editeng/unoedprx.hxx>
#include <editeng/AccessibleParaManager.hxx>
#include <editeng/AccessibleEditableTextPara.hxx>
#include <svx/svdmodel.hxx>
#include <svx/svdpntv.hxx>
#include <cell.hxx>
#include "../table/accessiblecell.hxx"
#include <editeng/editdata.hxx>
#include <tools/debug.hxx>
#include <comphelper/diagnose_ex.hxx>

using namespace ::com::sun::star;
using namespace ::com::sun::star::accessibility;

namespace accessibility
{

// AccessibleTextHelper_Impl declaration

template < typename first_type, typename second_type >
    static ::std::pair< first_type, second_type > makeSortedPair( first_type   first,
                                                                             second_type    second  )
{
    if( first > second )
        return ::std::make_pair( second, first );
    else
        return ::std::make_pair( first, second );
}

class AccessibleTextHelper_Impl : public SfxListener
{
public:
    // receive pointer to our frontend class and view window
    AccessibleTextHelper_Impl();
    virtual ~AccessibleTextHelper_Impl() override;

    // XAccessibleContext child handling methods
    sal_Int64 getAccessibleChildCount() const;
    rtl::Reference<comphelper::OAccessible> getAccessibleChild(sal_Int64 i);

    // XAccessibleEventBroadcaster child related methods
    void addAccessibleEventListener( const uno::Reference< XAccessibleEventListener >& xListener );
    void removeAccessibleEventListener( const uno::Reference< XAccessibleEventListener >& xListener );

    // XAccessibleComponent child related methods
    rtl::Reference<comphelper::OAccessible> getAccessibleAtPoint(const awt::Point& aPoint);

    SvxEditSourceAdapter& GetEditSource() const;

    void SetEditSource( ::std::unique_ptr< SvxEditSource > && pEditSource );

    void SetEventSource(const rtl::Reference<comphelper::OAccessible>& rEventSource)
    {
        mpFrontEnd = rEventSource;
    }

    void SetOffset( const Point& );
    Point GetOffset() const
    {
        std::scoped_lock aGuard( maMutex ); Point aPoint( maOffset );
        return aPoint;
    }

    void SetStartIndex( sal_Int32 nOffset );
    sal_Int32 GetStartIndex() const
    {
        // Strictly correct only with locked solar mutex, // but
        // here we rely on the fact that sal_Int32 access is
        // atomic
        return mnStartIndex;
    }

    void SetAdditionalChildStates( sal_Int64 nChildStates );

    void Dispose();

    // do NOT hold object mutex when calling this! Danger of deadlock
    void FireEvent( const sal_Int16 nEventId, const uno::Any& rNewValue = uno::Any(), const uno::Any& rOldValue = uno::Any() ) const;

    void SetFocus( bool bHaveFocus );
    bool HaveFocus() const
    {
        // No locking of solar mutex here, since we rely on the fact
        // that sal_Bool access is atomic
        return mbThisHasFocus;
    }
    void SetChildFocus( sal_Int32 nChild, bool bHaveFocus );
    void SetShapeFocus( bool bHaveFocus );
    void ChangeChildFocus( sal_Int32 nNewChild );

#ifdef DBG_UTIL
    void CheckInvariants() const;
#endif

    // checks all children for visibility, throws away invisible ones
    void UpdateVisibleChildren( bool bBroadcastEvents=true );

    // check all children for changes in position and size
    void UpdateBoundRect();

    // calls SetSelection on the forwarder and updates maLastSelection
    // cache.
    void UpdateSelection();

private:

    // Process event queue
    void ProcessQueue();

    // shutdown usage of current edit source on myself and the children.
    void ShutdownEditSource();

    void ParagraphsMoved( sal_Int32 nFirst, sal_Int32 nMiddle, sal_Int32 nLast );

    virtual void Notify( SfxBroadcaster& rBC, const SfxHint& rHint ) override;

    // lock solar mutex before
    SvxTextForwarder& GetTextForwarder() const;
    // lock solar mutex before
    SvxViewForwarder& GetViewForwarder() const;
    // lock solar mutex before
    SvxEditViewForwarder& GetEditViewForwarder() const;

    // are we in edit mode?
    bool IsActive() const;

    // our frontend class (the one implementing the actual
    // interface). That's not necessarily the one containing the impl
    // pointer!
    rtl::Reference<comphelper::OAccessible> mpFrontEnd;

    // a wrapper for the text forwarders (guarded by solar mutex)
    mutable SvxEditSourceAdapter maEditSource;

    // store last selection (to correctly report selection changes, guarded by solar mutex)
    ESelection maLastSelection;

    // cache range of visible children (guarded by solar mutex)
    sal_Int32 mnFirstVisibleChild;
    sal_Int32 mnLastVisibleChild;

    // offset to add to all our children (unguarded, relying on
    // the fact that sal_Int32 access is atomic)
    sal_Int32 mnStartIndex;

    // the object handling our children (guarded by solar mutex)
    ::accessibility::AccessibleParaManager maParaManager;

    // Queued events from Notify() (guarded by solar mutex)
    AccessibleTextEventQueue maEventQueue;

    // spin lock to prevent notify in notify (guarded by solar mutex)
    bool mbInNotify;

    // whether the object or its children has the focus set (guarded by solar mutex)
    bool mbGroupHasFocus;

    // whether we (this object) has the focus set (guarded by solar mutex)
    bool mbThisHasFocus;

    mutable std::mutex maMutex;

    /// our current offset to the containing shape/cell (guarded by maMutex)
    Point maOffset;

    /// client Id from AccessibleEventNotifier
    comphelper::AccessibleEventNotifier::TClientId mnNotifierClientId;
};

AccessibleTextHelper_Impl::AccessibleTextHelper_Impl() :
    maLastSelection( ESelection::AtEnd() ),
    mnFirstVisibleChild( -1 ),
    mnLastVisibleChild( -2 ),
    mnStartIndex( 0 ),
    mbInNotify( false ),
    mbGroupHasFocus( false ),
    mbThisHasFocus( false ),
    maOffset(0,0),
    // well, that's strictly exception safe, though not really
    // robust. We rely on the fact that this member is constructed
    // last, and that the constructor body is empty, thus no
    // chance for exceptions once the Id is fetched. Nevertheless,
    // normally should employ RAII here...
    mnNotifierClientId(::comphelper::AccessibleEventNotifier::registerClient())
{
    SAL_INFO("svx", "received ID: " << mnNotifierClientId );
}

AccessibleTextHelper_Impl::~AccessibleTextHelper_Impl()
{
    SolarMutexGuard aGuard;

    try
    {
        // call Dispose here, too, since we've some resources not
        // automatically freed otherwise
        Dispose();
    }
    catch( const uno::Exception& ) {}
}

SvxTextForwarder& AccessibleTextHelper_Impl::GetTextForwarder() const
{
    if( !maEditSource.IsValid() )
        throw uno::RuntimeException(u"Unknown edit source"_ustr);

    SvxTextForwarder* pTextForwarder = maEditSource.GetTextForwarder();

    if( !pTextForwarder )
        throw uno::RuntimeException(u"Unable to fetch text forwarder, model might be dead"_ustr);

    if( !pTextForwarder->IsValid() )
        throw uno::RuntimeException(u"Text forwarder is invalid, model might be dead"_ustr);

    return *pTextForwarder;
}

SvxViewForwarder& AccessibleTextHelper_Impl::GetViewForwarder() const
{
    if( !maEditSource.IsValid() )
        throw uno::RuntimeException(u"Unknown edit source"_ustr);

    SvxViewForwarder* pViewForwarder = maEditSource.GetViewForwarder();

    if( !pViewForwarder )
        throw uno::RuntimeException(u"Unable to fetch view forwarder, model might be dead"_ustr);

    if( !pViewForwarder->IsValid() )
        throw uno::RuntimeException(u"View forwarder is invalid, model might be dead"_ustr);

    return *pViewForwarder;
}

SvxEditViewForwarder& AccessibleTextHelper_Impl::GetEditViewForwarder() const
{
    if( !maEditSource.IsValid() )
        throw uno::RuntimeException(u"Unknown edit source"_ustr);

    SvxEditViewForwarder* pViewForwarder = maEditSource.GetEditViewForwarder();

    if( !pViewForwarder )
    {
        throw uno::RuntimeException(u"No edit view forwarder, object not in edit mode"_ustr);
    }

    if( !pViewForwarder->IsValid() )
    {
        throw uno::RuntimeException(u"View forwarder is invalid, object not in edit mode"_ustr);
    }

    return *pViewForwarder;
}

SvxEditSourceAdapter& AccessibleTextHelper_Impl::GetEditSource() const
{
    if( !maEditSource.IsValid() )
        throw uno::RuntimeException(
            u"AccessibleTextHelper_Impl::GetEditSource: no edit source"_ustr);
    return maEditSource;
}

namespace {

// functor for sending child events (no stand-alone function, they are maybe not inlined)
class AccessibleTextHelper_OffsetChildIndex
{
public:
    explicit AccessibleTextHelper_OffsetChildIndex( sal_Int32 nDifference ) : mnDifference(nDifference) {}
    void operator()( ::accessibility::AccessibleEditableTextPara& rPara )
    {
        rPara.SetIndexInParent( rPara.GetIndexInParent() + mnDifference );
    }

private:
    const sal_Int32 mnDifference;
};

}

void AccessibleTextHelper_Impl::SetStartIndex( sal_Int32 nOffset )
{
    sal_Int32 nOldOffset( mnStartIndex );

    mnStartIndex = nOffset;

    if( nOldOffset != nOffset )
    {
        // update children
        AccessibleTextHelper_OffsetChildIndex aFunctor( nOffset - nOldOffset );

        ::std::for_each( maParaManager.begin(), maParaManager.end(),
                         AccessibleParaManager::WeakChildAdapter< AccessibleTextHelper_OffsetChildIndex > (aFunctor) );
    }
}

void AccessibleTextHelper_Impl::SetAdditionalChildStates( sal_Int64 nChildStates )
{
    maParaManager.SetAdditionalChildStates( nChildStates );
}

void AccessibleTextHelper_Impl::SetChildFocus( sal_Int32 nChild, bool bHaveFocus )
{
    if( bHaveFocus )
    {
        if( mbThisHasFocus )
            SetShapeFocus( false );

        maParaManager.SetFocus( nChild );

        // we just received the focus, also send caret event then
        UpdateSelection();

        SAL_INFO("svx", "Paragraph " << nChild << " received focus");
    }
    else
    {
        maParaManager.SetFocus( -1 );

        SAL_INFO("svx", "Paragraph " << nChild << " lost focus");

        if( mbGroupHasFocus )
            SetShapeFocus( true );
    }
}

void AccessibleTextHelper_Impl::ChangeChildFocus( sal_Int32 nNewChild )
{
    if( mbThisHasFocus )
        SetShapeFocus( false );

    mbGroupHasFocus = true;
    maParaManager.SetFocus( nNewChild );

    SAL_INFO("svx", "Paragraph " << nNewChild << " received focus");
}

void AccessibleTextHelper_Impl::SetShapeFocus( bool bHaveFocus )
{
    bool bOldFocus( mbThisHasFocus );

    mbThisHasFocus = bHaveFocus;

    if( bOldFocus == bHaveFocus )
        return;

    if( bHaveFocus )
    {
        if (mpFrontEnd.is())
        {
            AccessibleCell* pAccessibleCell = dynamic_cast<AccessibleCell*>(mpFrontEnd.get());
            if ( !pAccessibleCell )
                FireEvent(AccessibleEventId::STATE_CHANGED, uno::Any(AccessibleStateType::FOCUSED));
            else    // the focus event on cell should be fired on table directly
            {
                AccessibleTableShape* pAccTable = pAccessibleCell->GetParentTable();
                if (pAccTable)
                    pAccTable->SetStateDirectly(AccessibleStateType::FOCUSED);
            }
        }
        SAL_INFO("svx", "Parent object received focus" );
    }
    else
    {
        // The focus state should be reset directly on table.
        //LostPropertyEvent( uno::makeAny(AccessibleStateType::FOCUSED), AccessibleEventId::STATE_CHANGED );
        if (mpFrontEnd.is())
        {
            AccessibleCell* pAccessibleCell = dynamic_cast<AccessibleCell*>(mpFrontEnd.get());
            if ( !pAccessibleCell )
                FireEvent( AccessibleEventId::STATE_CHANGED, uno::Any(), uno::Any(AccessibleStateType::FOCUSED) );
            else
            {
                AccessibleTableShape* pAccTable = pAccessibleCell->GetParentTable();
                if (pAccTable)
                    pAccTable->ResetStateDirectly(AccessibleStateType::FOCUSED);
            }
        }
        SAL_INFO("svx", "Parent object lost focus" );
    }
}

void AccessibleTextHelper_Impl::SetFocus( bool bHaveFocus )
{
    bool bOldFocus( mbGroupHasFocus );

    mbGroupHasFocus = bHaveFocus;

    if( IsActive() )
    {
        try
        {
            // find the one with the cursor and get/set focus accordingly
            ESelection aSelection;
            if( GetEditViewForwarder().GetSelection( aSelection ) )
                SetChildFocus(aSelection.end.nPara, bHaveFocus);
        }
        catch( const uno::Exception& ) {}
    }
    else if( bOldFocus != bHaveFocus )
    {
        SetShapeFocus( bHaveFocus );
    }

    SAL_INFO("svx", "focus changed, Object " << this << ", state: " << (bHaveFocus ? "focused" : "not focused") );
}

bool AccessibleTextHelper_Impl::IsActive() const
{
    try
    {
        SvxEditSource& rEditSource = GetEditSource();
        SvxEditViewForwarder* pViewForwarder = rEditSource.GetEditViewForwarder();

        if( !pViewForwarder )
            return false;

        if (mpFrontEnd.is())
        {
            AccessibleCell* pAccessibleCell = dynamic_cast<AccessibleCell*>(mpFrontEnd.get());
            if ( pAccessibleCell )
            {
                sdr::table::CellRef xCell = pAccessibleCell->getCellRef();
                if ( xCell.is() )
                    return xCell->IsActiveCell();
            }
        }
        return pViewForwarder->IsValid();
    }
    catch( const uno::RuntimeException& )
    {
        return false;
    }
}

void AccessibleTextHelper_Impl::UpdateSelection()
{
    try
    {
        if( !maEditSource.IsValid() )
            return;
        SvxEditViewForwarder* pViewForwarder = maEditSource.GetEditViewForwarder();
        if( !pViewForwarder || !pViewForwarder->IsValid())
            return;

        ESelection aSelection;
        if( !pViewForwarder->GetSelection( aSelection ) )
            return;

        if( maLastSelection == aSelection ||
            aSelection.end.nPara >= maParaManager.GetNum() )
            return;

        // #103998# Not that important, changed from assertion to trace
        if( mbThisHasFocus )
        {
            SAL_INFO("svx", "Parent has focus!");
        }

        sal_Int32 nMaxValidParaIndex( GetTextForwarder().GetParagraphCount() - 1 );

        // notify all affected paragraphs (TODO: may be suboptimal,
        // since some paragraphs might stay selected)
        if (maLastSelection.start.nPara != EE_PARA_MAX)
        {
            // Did the caret move from one paragraph to another?
            // #100530# no caret events if not focused.
            if( mbGroupHasFocus &&
                maLastSelection.end.nPara != aSelection.end.nPara )
            {
                if (maLastSelection.end.nPara < maParaManager.GetNum())
                {
                    maParaManager.FireEvent( ::std::min( maLastSelection.end.nPara, nMaxValidParaIndex ),
                                             ::std::min( maLastSelection.end.nPara, nMaxValidParaIndex )+1,
                                             AccessibleEventId::CARET_CHANGED,
                                             uno::Any(static_cast<sal_Int32>(-1)),
                                             uno::Any(maLastSelection.end.nIndex) );
                }

                ChangeChildFocus(aSelection.end.nPara);

                SAL_INFO(
                    "svx",
                    "focus changed, Object: " << this
                        << ", Paragraph: " << aSelection.end.nPara
                        << ", Last paragraph: "
                        << maLastSelection.end.nPara);
            }
        }

        // #100530# no caret events if not focused.
        if( mbGroupHasFocus )
        {
            uno::Any aOldCursor;

            // #i13705# The old cursor can only contain valid
            // values if it's the same paragraph!
            if( maLastSelection.start.nPara != EE_PARA_MAX &&
                maLastSelection.end.nPara == aSelection.end.nPara )
            {
                aOldCursor <<= maLastSelection.end.nIndex;
            }
            else
            {
                aOldCursor <<= static_cast<sal_Int32>(-1);
            }

            maParaManager.FireEvent( aSelection.end.nPara,
                                     aSelection.end.nPara+1,
                                     AccessibleEventId::CARET_CHANGED,
                                     uno::Any(aSelection.end.nIndex),
                                     aOldCursor );
        }

        SAL_INFO(
            "svx",
            "caret changed, Object: " << this << ", New pos: "
                << aSelection.end.nIndex << ", Old pos: "
                << maLastSelection.end.nIndex << ", New para: "
                << aSelection.end.nPara << ", Old para: "
                << maLastSelection.end.nPara);

        // #108947# Sort new range before calling FireEvent
        ::std::pair<sal_Int32, sal_Int32> sortedSelection(
            makeSortedPair(::std::min( aSelection.start.nPara, nMaxValidParaIndex ),
                           ::std::min( aSelection.end.nPara, nMaxValidParaIndex ) ) );

        // #108947# Sort last range before calling FireEvent
        ::std::pair<sal_Int32, sal_Int32> sortedLastSelection(
            makeSortedPair(::std::min( maLastSelection.start.nPara, nMaxValidParaIndex ),
                           ::std::min( maLastSelection.end.nPara, nMaxValidParaIndex ) ) );

        // event TEXT_SELECTION_CHANGED has to be submitted. (#i27299#)
        const sal_Int16 nTextSelChgEventId =
                        AccessibleEventId::TEXT_SELECTION_CHANGED;
        // #107037# notify selection change
        if (maLastSelection.start.nPara == EE_PARA_MAX)
        {
            // last selection is undefined
            // use method <ESelection::HasRange()> (#i27299#)
            if ( aSelection.HasRange() )
            {
                // selection was undefined, now is on
                maParaManager.FireEvent( sortedSelection.first,
                                         sortedSelection.second+1,
                                         nTextSelChgEventId );
            }
        }
        else
        {
            // last selection is valid
            // use method <ESelection::HasRange()> (#i27299#)
            if ( maLastSelection.HasRange() &&
                 !aSelection.HasRange() )
            {
                // selection was on, now is empty
                maParaManager.FireEvent( sortedLastSelection.first,
                                         sortedLastSelection.second+1,
                                         nTextSelChgEventId );
            }
            // use method <ESelection::HasRange()> (#i27299#)
            else if( !maLastSelection.HasRange() &&
                     aSelection.HasRange() )
            {
                // selection was empty, now is on
                maParaManager.FireEvent( sortedSelection.first,
                                         sortedSelection.second+1,
                                         nTextSelChgEventId );
            }
            // no event TEXT_SELECTION_CHANGED event, if new and
            // last selection are empty. (#i27299#)
            else if ( maLastSelection.HasRange() &&
                      aSelection.HasRange() )
            {
                // use sorted last and new selection
                ESelection aTmpLastSel( maLastSelection );
                aTmpLastSel.Adjust();
                ESelection aTmpSel( aSelection );
                aTmpSel.Adjust();
                // first submit event for new and changed selection
                sal_Int32 nPara = aTmpSel.start.nPara;
                for ( ; nPara <= aTmpSel.end.nPara; ++nPara )
                {
                    if ( nPara < aTmpLastSel.start.nPara ||
                         nPara > aTmpLastSel.end.nPara )
                    {
                        // new selection on paragraph <nPara>
                        maParaManager.FireEvent( nPara,
                                                 nTextSelChgEventId );
                    }
                    else
                    {
                        // check for changed selection on paragraph <nPara>
                        const sal_Int32 nParaStartPos =
                                nPara == aTmpSel.start.nPara
                                ? aTmpSel.start.nIndex : 0;
                        const sal_Int32 nParaEndPos =
                                nPara == aTmpSel.end.nPara
                                ? aTmpSel.end.nIndex : -1;
                        const sal_Int32 nLastParaStartPos =
                                nPara == aTmpLastSel.start.nPara
                                ? aTmpLastSel.start.nIndex : 0;
                        const sal_Int32 nLastParaEndPos =
                                nPara == aTmpLastSel.end.nPara
                                ? aTmpLastSel.end.nIndex : -1;
                        if ( nParaStartPos != nLastParaStartPos ||
                             nParaEndPos != nLastParaEndPos )
                        {
                            maParaManager.FireEvent(
                                        nPara, nTextSelChgEventId );
                        }
                    }
                }
                // second submit event for 'old' selections
                nPara = aTmpLastSel.start.nPara;
                for ( ; nPara <= aTmpLastSel.end.nPara; ++nPara )
                {
                    if ( nPara < aTmpSel.start.nPara ||
                         nPara > aTmpSel.end.nPara )
                    {
                        maParaManager.FireEvent( nPara,
                                                 nTextSelChgEventId );
                    }
                }
            }
        }

        maLastSelection = aSelection;
    }
    // no selection? no update actions
    catch( const uno::RuntimeException& ) {}
}

void AccessibleTextHelper_Impl::ShutdownEditSource()
{
    // This should only be called with solar mutex locked, i.e. from the main office thread

    // This here is somewhat clumsy: As soon as our children have
    // a NULL EditSource (maParaManager.SetEditSource()), they
    // enter the disposed state and cannot be reanimated. Thus, it
    // is unavoidable and a hard requirement to let go and create
    // from scratch each and every child.

    // invalidate children
    maParaManager.Dispose();
    maParaManager.SetNum(0);

    // lost all children
    if (mpFrontEnd.is())
        FireEvent(AccessibleEventId::INVALIDATE_ALL_CHILDREN);

    // quit listen on stale edit source
    if( maEditSource.IsValid() )
        EndListening( maEditSource.GetBroadcaster() );

    maEditSource.SetEditSource( ::std::unique_ptr< SvxEditSource >() );
}

void AccessibleTextHelper_Impl::SetEditSource( ::std::unique_ptr< SvxEditSource > && pEditSource )
{
    // This should only be called with solar mutex locked, i.e. from the main office thread

    // shutdown old edit source
    ShutdownEditSource();

    // set new edit source
    maEditSource.SetEditSource( std::move(pEditSource) );

    // init child vector to the current child count
    if( maEditSource.IsValid() )
    {
        maParaManager.SetNum( GetTextForwarder().GetParagraphCount() );

        // listen on new edit source
        StartListening( maEditSource.GetBroadcaster() );

        UpdateVisibleChildren();
    }
}

void AccessibleTextHelper_Impl::SetOffset( const Point& rPoint )
{
    // guard against non-atomic access to maOffset data structure
    {
        std::scoped_lock aGuard( maMutex );
        maOffset = rPoint;
    }

    maParaManager.SetEEOffset( rPoint );

    // in all cases, check visibility afterwards.
    UpdateVisibleChildren();
    UpdateBoundRect();
}

void AccessibleTextHelper_Impl::UpdateVisibleChildren( bool bBroadcastEvents )
{
    try
    {
        SvxTextForwarder& rCacheTF = GetTextForwarder();
        sal_Int32 nParas=rCacheTF.GetParagraphCount();

        // GetTextForwarder might have replaced everything, update
        // paragraph count in case it's outdated
        maParaManager.SetNum( nParas );

        mnFirstVisibleChild = -1;
        mnLastVisibleChild = -2;

        for( sal_Int32 nCurrPara=0; nCurrPara<nParas; ++nCurrPara )
        {
            if (nCurrPara == 0)
                mnFirstVisibleChild = nCurrPara;
            mnLastVisibleChild = nCurrPara;
            if (mpFrontEnd.is() && bBroadcastEvents)
            {
                // child not yet created?
                if (!maParaManager.HasCreatedChild(nCurrPara))
                {
                    FireEvent(
                        AccessibleEventId::CHILD,
                        uno::Any(css::uno::Reference<css::accessibility::XAccessible>(
                            maParaManager.CreateChild(nCurrPara - mnFirstVisibleChild, mpFrontEnd,
                                                      GetEditSource(), nCurrPara))));
                }
            }
        }
    }
    catch( const uno::Exception& )
    {
        OSL_FAIL("AccessibleTextHelper_Impl::UpdateVisibleChildren error while determining visible children");

        // something failed - currently no children
        mnFirstVisibleChild = -1;
        mnLastVisibleChild = -2;
        maParaManager.SetNum(0);

        // lost all children
        if( bBroadcastEvents )
            FireEvent(AccessibleEventId::INVALIDATE_ALL_CHILDREN);
    }
}

void AccessibleTextHelper_Impl::UpdateBoundRect()
{
    // send BOUNDRECT_CHANGED to affected children
    for(auto it = maParaManager.begin(); it != maParaManager.end(); ++it)
    {
        ::accessibility::AccessibleParaManager::WeakChild& rChild = *it;
        // retrieve hard reference from weak one
        auto aHardRef( rChild.first.get() );

        if( aHardRef.is() )
        {
            awt::Rectangle          aNewRect = aHardRef->getBounds();
            const awt::Rectangle&   aOldRect = rChild.second;
            if (aNewRect != aOldRect)
            {
                // visible data changed
                aHardRef->FireEvent( AccessibleEventId::BOUNDRECT_CHANGED );

                // update internal bounds
                rChild = ::accessibility::AccessibleParaManager::WeakChild( rChild.first, aNewRect );
            }
        }
    }
}

#ifdef DBG_UTIL
void AccessibleTextHelper_Impl::CheckInvariants() const
{
    if( mnFirstVisibleChild >= 0 &&
        mnFirstVisibleChild > mnLastVisibleChild )
    {
        OSL_FAIL( "AccessibleTextHelper: range invalid" );
    }
}
#endif

namespace {

// functor for sending child events (no stand-alone function, they are maybe not inlined)
class AccessibleTextHelper_LostChildEvent
{
public:
    explicit AccessibleTextHelper_LostChildEvent( AccessibleTextHelper_Impl& rImpl ) : mrImpl(rImpl) {}
    void operator()( const ::accessibility::AccessibleParaManager::WeakChild& rPara )
    {
        // retrieve hard reference from weak one
        auto aHardRef( rPara.first.get() );

        if( aHardRef.is() )
            mrImpl.FireEvent(AccessibleEventId::CHILD, uno::Any(), uno::Any(css::uno::Reference<css::accessibility::XAccessible>(aHardRef)) );
    }

private:
    AccessibleTextHelper_Impl&  mrImpl;
};

}

void AccessibleTextHelper_Impl::ParagraphsMoved( sal_Int32 nFirst, sal_Int32 nMiddle, sal_Int32 nLast )
{
    const sal_Int32 nParas = GetTextForwarder().GetParagraphCount();

    /* rotate paragraphs
     * =================
     *
     * Three cases:
     *
     * 1.
     *   ... nParagraph ... nParam1 ... nParam2 ...
     *       |______________[xxxxxxxxxxx]
     *              becomes
     *       [xxxxxxxxxxx]|______________
     *
     * tail is 0
     *
     * 2.
     *   ... nParam1 ... nParagraph ... nParam2 ...
     *       [xxxxxxxxxxx|xxxxxxxxxxxxxx]____________
     *              becomes
     *       ____________[xxxxxxxxxxx|xxxxxxxxxxxxxx]
     *
     * tail is nParagraph - nParam1
     *
     * 3.
     *   ... nParam1 ... nParam2 ... nParagraph ...
     *       [xxxxxxxxxxx]___________|____________
     *              becomes
     *       ___________|____________[xxxxxxxxxxx]
     *
     * tail is nParam2 - nParam1
     */

    // sort nParagraph, nParam1 and nParam2 in ascending order, calc range
    if( nMiddle < nFirst )
    {
        ::std::swap(nFirst, nMiddle);
    }
    else if( nMiddle < nLast )
    {
        nLast = nLast + nMiddle - nFirst;
    }
    else
    {
        ::std::swap(nMiddle, nLast);
        nLast = nLast + nMiddle - nFirst;
    }

    if( !(nFirst < nParas && nMiddle < nParas && nLast < nParas) )
        return;

    // since we have no "paragraph index
    // changed" event on UAA, remove
    // [first,last] and insert again later (in
    // UpdateVisibleChildren)

    // maParaManager.Rotate( nFirst, nMiddle, nLast );

    // send CHILD_EVENT to affected children
    ::accessibility::AccessibleParaManager::VectorOfChildren::const_iterator begin = maParaManager.begin();
    ::accessibility::AccessibleParaManager::VectorOfChildren::const_iterator end = begin;

    ::std::advance( begin, nFirst );
    ::std::advance( end, nLast+1 );

    // TODO: maybe optimize here in the following way.  If the
    // number of removed children exceeds a certain threshold,
    // use InvalidateFlags::Children
    AccessibleTextHelper_LostChildEvent aFunctor( *this );

    ::std::for_each( begin, end, aFunctor );

    maParaManager.Release(nFirst, nLast+1);
    // should be no need for UpdateBoundRect, since all affected children are cleared.
}

namespace {

// functor for sending child events (no stand-alone function, they are maybe not inlined)
class AccessibleTextHelper_ChildrenTextChanged
{
public:
    void operator()( ::accessibility::AccessibleEditableTextPara& rPara )
    {
        rPara.TextChanged();
    }
};

/** functor processing queue events

    Reacts on SfxHintId::TextParaInserted/REMOVED events and stores
    their content
 */
class AccessibleTextHelper_QueueFunctor
{
public:
    AccessibleTextHelper_QueueFunctor() :
        mnParasChanged( 0 ),
        mnParaIndex(-1),
        mnHintId(SfxHintId::NONE)
    {}
    void operator()( const SfxHint* pEvent )
    {
        if( !pEvent || mnParasChanged == -1 )
            return;

        // determine hint type
        const TextHint* pTextHint = dynamic_cast<const TextHint*>( pEvent );
        const SvxEditSourceHint* pEditSourceHint = dynamic_cast<const SvxEditSourceHint*>( pEvent );

        if( !(!pEditSourceHint && pTextHint &&
            (pTextHint->GetId() == SfxHintId::TextParaInserted ||
             pTextHint->GetId() == SfxHintId::TextParaRemoved )) )
            return;

        if (pTextHint->GetValue() == EE_PARA_MAX)
        {
            mnParasChanged = -1;
        }
        else
        {
            mnHintId = pTextHint->GetId();
            mnParaIndex = pTextHint->GetValue();
            ++mnParasChanged;
        }
    }

    /** Query number of paragraphs changed during queue processing.

        @return number of changed paragraphs, -1 for
        "every paragraph changed"
    */
    sal_Int32 GetNumberOfParasChanged() const { return mnParasChanged; }
    /** Query index of last added/removed paragraph

        @return index of lastly added paragraphs, -1 for none
        added so far.
    */
    sal_Int32 GetParaIndex() const { return mnParaIndex; }
    /** Query hint id of last interesting event

        @return hint id of last interesting event (REMOVED/INSERTED).
    */
    SfxHintId GetHintId() const { return mnHintId; }

private:
    /** number of paragraphs changed during queue processing. -1 for
        "every paragraph changed"
    */
    sal_Int32 mnParasChanged;
    /// index of paragraph added/removed last
    sal_Int32 mnParaIndex;
    /// TextHint ID (removed/inserted) of last interesting event
    SfxHintId mnHintId;
};

}

void AccessibleTextHelper_Impl::ProcessQueue()
{
    // inspect queue for paragraph insert/remove events. If there
    // is exactly _one_ of those in the queue, and the number of
    // paragraphs has changed by exactly one, use that event to
    // determine a priori which paragraph was added/removed. This
    // is necessary, since I must sync right here with the
    // EditEngine state (number of paragraphs etc.), since I'm
    // potentially sending listener events right away.
    AccessibleTextHelper_QueueFunctor aFunctor;
    maEventQueue.ForEach( aFunctor );

    const sal_Int32 nNewParas( GetTextForwarder().GetParagraphCount() );
    const sal_Int32 nCurrParas( maParaManager.GetNum() );

    // whether every paragraph already is updated (no need to
    // repeat that later on, e.g. for PARA_MOVED events)
    bool            bEverythingUpdated( false );

    if( std::abs( nNewParas - nCurrParas ) == 1 &&
        aFunctor.GetNumberOfParasChanged() == 1 )
    {
        // #103483# Exactly one paragraph added/removed. This is
        // the normal case, optimize event handling here.

        if( aFunctor.GetHintId() == SfxHintId::TextParaInserted )
        {
            // update num of paras
            maParaManager.SetNum( nNewParas );

            // release everything from the insertion position until the end
            maParaManager.Release(aFunctor.GetParaIndex(), nCurrParas);

            // TODO: Clarify whether this behaviour _really_ saves
            // anybody anything!
            // update children, _don't_ broadcast
            UpdateVisibleChildren( false );
            UpdateBoundRect();

            // send insert event
            // #109864# Enforce creation of this paragraph
            try
            {
                FireEvent(AccessibleEventId::CHILD,
                          uno::Any(uno::Reference<XAccessible>(getAccessibleChild(
                              aFunctor.GetParaIndex() - mnFirstVisibleChild + GetStartIndex()))));
            }
            catch( const uno::Exception& )
            {
                OSL_FAIL("AccessibleTextHelper_Impl::ProcessQueue: could not create new paragraph");
            }
        }
        else if( aFunctor.GetHintId() == SfxHintId::TextParaRemoved )
        {
            ::accessibility::AccessibleParaManager::VectorOfChildren::const_iterator begin = maParaManager.begin();
            ::std::advance( begin, aFunctor.GetParaIndex() );
            ::accessibility::AccessibleParaManager::VectorOfChildren::const_iterator end = begin;
            ::std::advance( end, 1 );

            // #i61812# remember para to be removed for later notification
            // AFTER the new state is applied (that after the para got removed)
            rtl::Reference<AccessibleEditableTextPara> xPara(begin->first.get());

            // release everything from the remove position until the end
            maParaManager.Release(aFunctor.GetParaIndex(), nCurrParas);

            // update num of paras
            maParaManager.SetNum( nNewParas );

            // TODO: Clarify whether this behaviour _really_ saves
            // anybody anything!
            // update children, _don't_ broadcast
            UpdateVisibleChildren( false );
            UpdateBoundRect();

            // #i61812# notification for removed para
            if (xPara.is())
                FireEvent(AccessibleEventId::CHILD, uno::Any(), uno::Any( ::uno::Reference< XAccessible >(xPara) ) );
        }
#ifdef DBG_UTIL
        else
            OSL_FAIL("AccessibleTextHelper_Impl::ProcessQueue() invalid hint id");
#endif
    }
    else if( nNewParas != nCurrParas )
    {
        // release all paras
        maParaManager.Release(0, nCurrParas);

        // update num of paras
        maParaManager.SetNum( nNewParas );

        // #109864# create from scratch, don't broadcast
        UpdateVisibleChildren( false );
        UpdateBoundRect();

        // number of paragraphs somehow changed - but we have no
        // chance determining how. Thus, throw away everything and
        // create from scratch.
        // (child events should be broadcast after the changes are done...)
        FireEvent(AccessibleEventId::INVALIDATE_ALL_CHILDREN);

        // no need for further updates later on
        bEverythingUpdated = true;
    }

    bool bUpdatedBoundRectAndVisibleChildren(false);

    while( !maEventQueue.IsEmpty() )
    {
        ::std::unique_ptr< SfxHint > pHint( maEventQueue.PopFront() );
        assert(pHint);
        const SfxHint& rHint = *pHint;

        // Note, if you add events here, you need to update the AccessibleTextEventQueue::Append
        // code, because only the events we process here, are actually queued there.

        try
        {

            if (rHint.GetId() == SfxHintId::ThisIsAnSdrHint)
            {
                const SdrHint* pSdrHint = static_cast< const SdrHint* >( &rHint );

                switch( pSdrHint->GetKind() )
                {
                    case SdrHintKind::BeginEdit:
                    {
                        if(!IsActive())
                        {
                            break;
                        }
                        // change children state
                        maParaManager.SetActive();

                        // per definition, edit mode text has the focus
                        SetFocus( true );
                        break;
                    }

                    case SdrHintKind::EndEdit:
                    {
                        // focused child now loses focus
                        ESelection aSelection;
                        if( GetEditViewForwarder().GetSelection( aSelection ) )
                            SetChildFocus(aSelection.end.nPara, false);

                        // change children state
                        maParaManager.SetActive( false );

                        maLastSelection = ESelection::AtEnd();
                        break;
                    }
                    default:
                        break;
                }
            }
            else if( const SvxEditSourceHint* pEditSourceHint = dynamic_cast<const SvxEditSourceHint*>( &rHint ) )
            {
                switch( pEditSourceHint->GetId() )
                {
                    case SfxHintId::EditSourceParasMoved:
                    {
                        DBG_ASSERT( pEditSourceHint->GetStartValue() < GetTextForwarder().GetParagraphCount() &&
                                    pEditSourceHint->GetEndValue() < GetTextForwarder().GetParagraphCount(),
                                    "AccessibleTextHelper_Impl::NotifyHdl: Invalid notification");

                        if( !bEverythingUpdated )
                        {
                            ParagraphsMoved(pEditSourceHint->GetStartValue(),
                                            pEditSourceHint->GetValue(),
                                            pEditSourceHint->GetEndValue());

                            // in all cases, check visibility afterwards.
                            UpdateVisibleChildren();
                        }
                        break;
                    }

                    case SfxHintId::EditSourceSelectionChanged:
                        // notify listeners
                        try
                        {
                            UpdateSelection();
                        }
                        // maybe we're not in edit mode (this is not an error)
                        catch( const uno::Exception& ) {}
                        break;
                    default: break;
                }
            }
            else if( const TextHint* pTextHint = dynamic_cast<const TextHint*>( &rHint ) )
            {
                const sal_Int32 nParas = GetTextForwarder().GetParagraphCount();

                switch( pTextHint->GetId() )
                {
                    case SfxHintId::TextModified:
                    {
                        // notify listeners
                        sal_Int32 nPara( pTextHint->GetValue() );

                        // #108900# Delegate change event to children
                        AccessibleTextHelper_ChildrenTextChanged aNotifyChildrenFunctor;

                        if (nPara == EE_PARA_MAX)
                        {
                            // #108900# Call every child
                            ::std::for_each( maParaManager.begin(), maParaManager.end(),
                                             AccessibleParaManager::WeakChildAdapter< AccessibleTextHelper_ChildrenTextChanged > (aNotifyChildrenFunctor) );
                        }
                        else
                            if( nPara < nParas )
                            {
                                // #108900# Call child at index nPara
                                ::std::for_each( maParaManager.begin()+nPara, maParaManager.begin()+nPara+1,
                                                 AccessibleParaManager::WeakChildAdapter< AccessibleTextHelper_ChildrenTextChanged > (aNotifyChildrenFunctor) );
                            }
                        break;
                    }

                    case SfxHintId::TextParaInserted:
                        // already happened above
                        break;

                    case SfxHintId::TextParaRemoved:
                        // already happened above
                        break;

                    case SfxHintId::TextHeightChanged:
                        // visibility changed, done below
                        break;

                    case SfxHintId::TextViewScrolled:
                        // visibility changed, done below
                        break;
                    default: break;
                }

                // in all cases, check visibility afterwards.
                if (!bUpdatedBoundRectAndVisibleChildren)
                {
                    UpdateVisibleChildren();
                    UpdateBoundRect();
                    bUpdatedBoundRectAndVisibleChildren = true;
                }
            }
            else if (rHint.GetId() == SfxHintId::SvxViewChanged)
            {
                // just check visibility
                if (!bUpdatedBoundRectAndVisibleChildren)
                {
                    UpdateVisibleChildren();
                    UpdateBoundRect();
                    bUpdatedBoundRectAndVisibleChildren = true;
                }
            }
            // it's VITAL to keep the SfxSimpleHint last! It's the base of some classes above!
            else if( rHint.GetId() == SfxHintId::Dying)
            {
                // edit source is dying under us, become defunc then
                try
                {
                    // make edit source inaccessible
                    // Note: cannot destroy it here, since we're called from there!
                    ShutdownEditSource();
                }
                catch( const uno::Exception& ) {}
            }
        }
        catch( const uno::Exception& )
        {
            DBG_UNHANDLED_EXCEPTION("svx");
        }
    }
}

void AccessibleTextHelper_Impl::Notify( SfxBroadcaster& /*rBC*/, const SfxHint& rHint )
{
    // precondition: solar mutex locked
    DBG_TESTSOLARMUTEX();

    // precondition: not in a recursion
    if( mbInNotify )
        return;

    mbInNotify = true;

    try
    {
        // Process notification event, arranged in order of likelihood of
        // occurrence to avoid unnecessary dynamic_cast. Note that
        // SvxEditSourceHint is derived from TextHint, so has to be checked
        // before that.
        if (rHint.GetId() == SfxHintId::ThisIsAnSdrHint)
        {
            const SdrHint* pSdrHint = static_cast< const SdrHint* >( &rHint );
            // process drawing layer events right away, if not
            // within an open EE notification frame. Otherwise,
            // event processing would be delayed until next EE
            // notification sequence.
            maEventQueue.Append( *pSdrHint );
        }
        else if (rHint.GetId() == SfxHintId::SvxViewChanged)
        {
            const SvxViewChangedHint* pViewHint = static_cast<const SvxViewChangedHint*>(&rHint);
            // process visibility right away, if not within an
            // open EE notification frame. Otherwise, event
            // processing would be delayed until next EE
            // notification sequence.
            maEventQueue.Append( *pViewHint );
        }
        else if( const SvxEditSourceHint* pEditSourceHint = dynamic_cast<const SvxEditSourceHint*>( &rHint ) )
        {
            // EditEngine should emit TEXT_SELECTION_CHANGED events (#i27299#)
            maEventQueue.Append( *pEditSourceHint );
        }
        else if( const TextHint* pTextHint = dynamic_cast<const TextHint*>( &rHint ) )
        {
            // EditEngine should emit TEXT_SELECTION_CHANGED events (#i27299#)
            if(pTextHint->GetId() == SfxHintId::TextProcessNotifications)
                ProcessQueue();
            else
                maEventQueue.Append( *pTextHint );
        }
        // it's VITAL to keep the SfxHint last! It's the base of the classes above!
        else if( rHint.GetId() == SfxHintId::Dying )
        {
            // handle this event _at once_, because after that, objects are invalid
            // edit source is dying under us, become defunc then
            maEventQueue.Clear();
            try
            {
                // make edit source inaccessible
                // Note: cannot destroy it here, since we're called from there!
                ShutdownEditSource();
            }
            catch( const uno::Exception& ) {}
        }
    }
    catch( const uno::Exception& )
    {
        DBG_UNHANDLED_EXCEPTION("svx");
        mbInNotify = false;
    }

    mbInNotify = false;
}

void AccessibleTextHelper_Impl::Dispose()
{
    if (mnNotifierClientId != 0)
    {
        try
        {
            // #106234# Unregister from EventNotifier
            ::comphelper::AccessibleEventNotifier::revokeClient(mnNotifierClientId);
            SAL_INFO("svx", "disposed ID: " << mnNotifierClientId );
        }
        catch( const uno::Exception& ) {}

        mnNotifierClientId = 0;
    }

    try
    {
        // dispose children
        maParaManager.Dispose();
    }
    catch( const uno::Exception& ) {}

    // quit listen on stale edit source
    if( maEditSource.IsValid() )
        EndListening( maEditSource.GetBroadcaster() );

    // clear references
    maEditSource.SetEditSource( ::std::unique_ptr< SvxEditSource >() );
    mpFrontEnd = nullptr;
}

void AccessibleTextHelper_Impl::FireEvent( const sal_Int16 nEventId, const uno::Any& rNewValue, const uno::Any& rOldValue ) const
{
    // -- object locked --
    AccessibleEventObject aEvent;
    {
        std::scoped_lock aGuard(maMutex);

        DBG_ASSERT(mpFrontEnd.is(), "AccessibleTextHelper::FireEvent: no event source set");

        if (mpFrontEnd.is())
            aEvent = AccessibleEventObject(mpFrontEnd->getAccessibleContext(), nEventId, rNewValue,
                                           rOldValue, -1);
        else
            aEvent = AccessibleEventObject(uno::Reference<uno::XInterface>(), nEventId,
                                           rNewValue, rOldValue, -1);

        // no locking necessary, FireEvent internally copies listeners
        // if someone removes/adds in between Further locking,
        // actually, might lead to deadlocks, since we're calling out
        // of this object
    }
    // -- until here --

    if (mnNotifierClientId != 0)
        ::comphelper::AccessibleEventNotifier::addEvent(mnNotifierClientId, aEvent);
}

// XAccessibleContext
sal_Int64 AccessibleTextHelper_Impl::getAccessibleChildCount() const
{
    return mnLastVisibleChild - mnFirstVisibleChild + 1;
}

rtl::Reference<comphelper::OAccessible> AccessibleTextHelper_Impl::getAccessibleChild(sal_Int64 i)
{
    i -= GetStartIndex();

    if( 0 > i || i >= getAccessibleChildCount() ||
        GetTextForwarder().GetParagraphCount() <= i )
    {
        throw lang::IndexOutOfBoundsException(u"Invalid child index"_ustr);
    }

    DBG_ASSERT(mpFrontEnd.is(),
               "AccessibleTextHelper_Impl::UpdateVisibleChildren: no frontend set");

    if (mpFrontEnd.is())
        return maParaManager.CreateChild(i, mpFrontEnd, GetEditSource(), mnFirstVisibleChild + i);
    else
        return nullptr;
}

void AccessibleTextHelper_Impl::addAccessibleEventListener( const uno::Reference< XAccessibleEventListener >& xListener )
{
    if (mnNotifierClientId != 0)
        ::comphelper::AccessibleEventNotifier::addEventListener(mnNotifierClientId, xListener);
}

void AccessibleTextHelper_Impl::removeAccessibleEventListener( const uno::Reference< XAccessibleEventListener >& xListener )
{
    if (mnNotifierClientId == 0)
        return;

    const sal_Int32 nListenerCount
        = ::comphelper::AccessibleEventNotifier::removeEventListener(mnNotifierClientId, xListener);
    if ( !nListenerCount )
    {
        // no listeners anymore
        // -> revoke ourself. This may lead to the notifier thread dying (if we were the last client),
        // and at least to us not firing any events anymore, in case somebody calls
        // NotifyAccessibleEvent, again
        ::comphelper::AccessibleEventNotifier::TClientId nId = mnNotifierClientId;
        mnNotifierClientId = 0;
        ::comphelper::AccessibleEventNotifier::revokeClient( nId );
    }
}

rtl::Reference<comphelper::OAccessible>
AccessibleTextHelper_Impl::getAccessibleAtPoint(const awt::Point& _aPoint)
{
    // make given position relative
    if (!mpFrontEnd.is())
        throw uno::RuntimeException(
            u"AccessibleTextHelper_Impl::getAccessibleAt: frontend invalid"_ustr);

    // #103862# No longer need to make given position relative
    Point aPoint( _aPoint.X, _aPoint.Y );

    // respect EditEngine offset to surrounding shape/cell
    aPoint -= GetOffset();

    // convert to EditEngine coordinate system
    SvxTextForwarder& rCacheTF = GetTextForwarder();
    Point aLogPoint( GetViewForwarder().PixelToLogic( aPoint, rCacheTF.GetMapMode() ) );

    // iterate over all visible children (including those not yet created)
    sal_Int64 nChild;
    for( nChild=mnFirstVisibleChild; nChild <= mnLastVisibleChild; ++nChild )
    {
        DBG_ASSERT(nChild >= 0,
                   "AccessibleTextHelper_Impl::getAccessibleAt: index value overflow");

        tools::Rectangle aParaBounds( rCacheTF.GetParaBounds( nChild ) );

        if( aParaBounds.Contains( aLogPoint ) )
            return getAccessibleChild( nChild - mnFirstVisibleChild + GetStartIndex() );
    }

    // found none
    return nullptr;
}


// AccessibleTextHelper implementation (simply forwards to impl)

AccessibleTextHelper::AccessibleTextHelper( ::std::unique_ptr< SvxEditSource > && pEditSource ) :
    mpImpl( new AccessibleTextHelper_Impl() )
{
    SolarMutexGuard aGuard;

    SetEditSource( std::move(pEditSource) );
}

AccessibleTextHelper::~AccessibleTextHelper()
{
}

const SvxEditSource& AccessibleTextHelper::GetEditSource() const
{
#ifdef DBG_UTIL
    mpImpl->CheckInvariants();

    const SvxEditSource& aEditSource = mpImpl->GetEditSource();

    mpImpl->CheckInvariants();

    return aEditSource;
#else
    return mpImpl->GetEditSource();
#endif
}

void AccessibleTextHelper::SetEditSource( ::std::unique_ptr< SvxEditSource > && pEditSource )
{
#ifdef DBG_UTIL
    // precondition: solar mutex locked
    DBG_TESTSOLARMUTEX();

    mpImpl->CheckInvariants();
#endif

    mpImpl->SetEditSource( std::move(pEditSource) );

#ifdef DBG_UTIL
    mpImpl->CheckInvariants();
#endif
}

void AccessibleTextHelper::SetEventSource(
    const rtl::Reference<comphelper::OAccessible>& rEventSource)
{
#ifdef DBG_UTIL
    mpImpl->CheckInvariants();
#endif

    mpImpl->SetEventSource(rEventSource);

#ifdef DBG_UTIL
    mpImpl->CheckInvariants();
#endif
}

void AccessibleTextHelper::SetFocus( bool bHaveFocus )
{
#ifdef DBG_UTIL
    // precondition: solar mutex locked
    DBG_TESTSOLARMUTEX();

    mpImpl->CheckInvariants();
#endif

    mpImpl->SetFocus( bHaveFocus );

#ifdef DBG_UTIL
    mpImpl->CheckInvariants();
#endif
}

bool AccessibleTextHelper::HaveFocus()
{
#ifdef DBG_UTIL
    mpImpl->CheckInvariants();

    bool bRet( mpImpl->HaveFocus() );

    mpImpl->CheckInvariants();

    return bRet;
#else
    return mpImpl->HaveFocus();
#endif
}

void AccessibleTextHelper::SetOffset( const Point& rPoint )
{
#ifdef DBG_UTIL
    // precondition: solar mutex locked
    DBG_TESTSOLARMUTEX();

    mpImpl->CheckInvariants();
#endif

    mpImpl->SetOffset( rPoint );

#ifdef DBG_UTIL
    mpImpl->CheckInvariants();
#endif
}

void AccessibleTextHelper::SetStartIndex( sal_Int32 nOffset )
{
#ifdef DBG_UTIL
    // precondition: solar mutex locked
    DBG_TESTSOLARMUTEX();

    mpImpl->CheckInvariants();
#endif

    mpImpl->SetStartIndex( nOffset );

#ifdef DBG_UTIL
    mpImpl->CheckInvariants();
#endif
}

sal_Int32 AccessibleTextHelper::GetStartIndex() const
{
#ifdef DBG_UTIL
    mpImpl->CheckInvariants();

    sal_Int32 nOffset = mpImpl->GetStartIndex();

    mpImpl->CheckInvariants();

    return nOffset;
#else
    return mpImpl->GetStartIndex();
#endif
}

void AccessibleTextHelper::SetAdditionalChildStates( sal_Int64 nChildStates )
{
    mpImpl->SetAdditionalChildStates( nChildStates );
}

void AccessibleTextHelper::UpdateChildren()
{
#ifdef DBG_UTIL
    // precondition: solar mutex locked
    DBG_TESTSOLARMUTEX();

    mpImpl->CheckInvariants();
#endif

    mpImpl->UpdateVisibleChildren();
    mpImpl->UpdateBoundRect();

    mpImpl->UpdateSelection();

#ifdef DBG_UTIL
    mpImpl->CheckInvariants();
#endif
}

void AccessibleTextHelper::UpdateSelection()
{
#ifdef DBG_UTIL
    // precondition: solar mutex locked
    DBG_TESTSOLARMUTEX();
    mpImpl->CheckInvariants();
#endif

    mpImpl->UpdateSelection();

#ifdef DBG_UTIL
    mpImpl->CheckInvariants();
#endif
}

void AccessibleTextHelper::Dispose()
{
    // As Dispose calls ShutdownEditSource, which in turn
    // deregisters as listener on the edit source, have to lock
    // here
    SolarMutexGuard aGuard;

#ifdef DBG_UTIL
    mpImpl->CheckInvariants();
#endif

    mpImpl->Dispose();

#ifdef DBG_UTIL
    mpImpl->CheckInvariants();
#endif
}

// XAccessibleContext
sal_Int64 AccessibleTextHelper::GetChildCount() const
{
    SolarMutexGuard aGuard;

#ifdef DBG_UTIL
    mpImpl->CheckInvariants();

    sal_Int64 nRet = mpImpl->getAccessibleChildCount();

    mpImpl->CheckInvariants();

    return nRet;
#else
    return mpImpl->getAccessibleChildCount();
#endif
}

rtl::Reference<comphelper::OAccessible> AccessibleTextHelper::GetChild(sal_Int64 i)
{
    SolarMutexGuard aGuard;

#ifdef DBG_UTIL
    mpImpl->CheckInvariants();

    rtl::Reference<comphelper::OAccessible> pRet = mpImpl->getAccessibleChild(i);

    mpImpl->CheckInvariants();

    return pRet;
#else
    return mpImpl->getAccessibleChild( i );
#endif
}

void AccessibleTextHelper::AddEventListener( const uno::Reference< XAccessibleEventListener >& xListener )
{
#ifdef DBG_UTIL
    mpImpl->CheckInvariants();

    mpImpl->addAccessibleEventListener( xListener );

    mpImpl->CheckInvariants();
#else
    mpImpl->addAccessibleEventListener( xListener );
#endif
}

void AccessibleTextHelper::RemoveEventListener( const uno::Reference< XAccessibleEventListener >& xListener )
{
#ifdef DBG_UTIL
    mpImpl->CheckInvariants();

    mpImpl->removeAccessibleEventListener( xListener );

    mpImpl->CheckInvariants();
#else
    mpImpl->removeAccessibleEventListener( xListener );
#endif
}

// XAccessibleComponent
rtl::Reference<comphelper::OAccessible> AccessibleTextHelper::GetAt(const awt::Point& aPoint)
{
    SolarMutexGuard aGuard;

#ifdef DBG_UTIL
    mpImpl->CheckInvariants();

    rtl::Reference<comphelper::OAccessible> pChild = mpImpl->getAccessibleAtPoint(aPoint);

    mpImpl->CheckInvariants();

    return pChild;
#else
    return mpImpl->getAccessibleAtPoint( aPoint );
#endif
}

} // end of namespace accessibility


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