/* -*- 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/.

 */

#include <config_wasm_strip.h>

#include <sfx2/thumbnailview.hxx>

#include <sfx2/thumbnailviewitem.hxx>

#include <utility>

#include "thumbnailviewacc.hxx"

#include "thumbnailviewitemacc.hxx"

#include <basegfx/color/bcolortools.hxx>

#include <comphelper/processfactory.hxx>

#include <comphelper/propertyvalue.hxx>

#include <drawinglayer/attribute/fontattribute.hxx>

#include <drawinglayer/primitive2d/PolyPolygonColorPrimitive2D.hxx>

#include <drawinglayer/primitive2d/Primitive2DContainer.hxx>

#include <drawinglayer/primitive2d/textlayoutdevice.hxx>

#include <drawinglayer/processor2d/baseprocessor2d.hxx>

#include <drawinglayer/processor2d/processor2dtools.hxx>

#include <o3tl/safeint.hxx>

#include <rtl/ustring.hxx>

#include <sal/log.hxx>

#include <svtools/optionsdrawinglayer.hxx>

#include <tools/stream.hxx>

#include <comphelper/diagnose_ex.hxx>

#include <unotools/ucbstreamhelper.hxx>

#include <vcl/svapp.hxx>

#include <vcl/settings.hxx>

#include <vcl/event.hxx>

#include <vcl/filter/PngImageReader.hxx>

#include <vcl/graph.hxx>

#include <vcl/graphicfilter.hxx>

#include <vcl/weld/weldutils.hxx>

#include <com/sun/star/accessibility/AccessibleEventId.hpp>

#include <com/sun/star/embed/ElementModes.hpp>

#include <com/sun/star/embed/StorageFactory.hpp>

#include <com/sun/star/embed/StorageFormats.hpp>

#include <com/sun/star/embed/XHierarchicalStorageAccess.hpp>

#include <com/sun/star/embed/XRelationshipAccess.hpp>

#include <com/sun/star/embed/XStorage.hpp>

#include <com/sun/star/packages/zip/ZipFileAccess.hpp>

#include <memory>

#if !ENABLE_WASM_STRIP_RECENT

#include "recentdocsviewitem.hxx"

#endif

using namespace basegfx;

using namespace drawinglayer::attribute;

using namespace drawinglayer::primitive2d;

constexpr int gnFineness = 5;

bool ThumbnailView::renameItem(ThumbnailViewItem&, const OUString&)

{

    // Do nothing by default

    return false;

}

static css::uno::Reference<css::embed::XHierarchicalStorageAccess>

getStorageAccess(const OUString& URL, sal_Int32 format)

{

    auto xFactory = css::embed::StorageFactory::create(comphelper::getProcessComponentContext());

    css::uno::Sequence descriptor{ comphelper::makePropertyValue(u"StorageFormat"_ustr, format) };

    css::uno::Sequence args{ css::uno::Any(URL), css::uno::Any(css::embed::ElementModes::READ),

                             css::uno::Any(descriptor) };

    return xFactory->createInstanceWithArguments(args)

        .queryThrow<css::embed::XHierarchicalStorageAccess>();

}

static css::uno::Reference<css::io::XInputStream>

getHierarchicalStream(const css::uno::Reference<css::embed::XHierarchicalStorageAccess>& xStorage,

                      const OUString& name)

{

    auto xStream

        = xStorage->openStreamElementByHierarchicalName(name, css::embed::ElementModes::READ);

    return xStream->getInputStream();

}

static css::uno::Reference<css::io::XInputStream>

getFirstHierarchicalStream(const OUString& URL, sal_Int32 format,

                           std::initializer_list<OUString> names)

{

    auto xStorage(getStorageAccess(URL, format));

    for (const auto& name : names)

    {

        try

        {

            return getHierarchicalStream(xStorage, name);

        }

        catch (const css::uno::Exception&)

        {

            TOOLS_WARN_EXCEPTION("sfx", "caught exception while trying to access " << name << " of "

                                                                                   << URL);

        }

    }

    return {};

}

static css::uno::Reference<css::io::XInputStream>

getFirstStreamByRelType(const OUString& URL, std::initializer_list<OUString> types)

{

    auto xStorage(getStorageAccess(URL, css::embed::StorageFormats::OFOPXML));

    if (auto xRelationshipAccess = xStorage.query<css::embed::XRelationshipAccess>())

    {

        for (const auto& type : types)

        {

            auto rels = xRelationshipAccess->getRelationshipsByType(type);

            if (rels.hasElements())

            {

                // ISO/IEC 29500-1:2016(E) 15.2.16 Thumbnail Part: "Packages shall not contain

                // more than one thumbnail relationship associated with the package as a whole"

                for (const auto& [tag, value] : rels[0])

                {

                    if (tag == "Id")

                    {

                        return getHierarchicalStream(xStorage,

                                                     xRelationshipAccess->getTargetByID(value));

                    }

                }

            }

        }

    }

    return {};

}

Bitmap ThumbnailView::readThumbnail(const OUString &msURL)

{

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

    using namespace ::com::sun::star::uno;

    // Load the thumbnail from a template document.

    uno::Reference<io::XInputStream> xIStream;

    try

    {

        // An (older) implementation had a bug - The storage

        // name was "Thumbnail" instead of "Thumbnails".  The

        // old name is still used as fallback but this code can

        // be removed soon.

        xIStream = getFirstHierarchicalStream(

            msURL, embed::StorageFormats::PACKAGE,

            { u"Thumbnails/thumbnail.png"_ustr, u"Thumbnail/thumbnail.png"_ustr });

    }

    catch (const uno::Exception&)

    {

        TOOLS_WARN_EXCEPTION("sfx",

            "caught exception while trying to access thumbnail of "

            << msURL);

    }

    if (!xIStream.is())

    {

        // OOXML?

        try

        {

            // Check both Transitional and Strict relationships

            xIStream = getFirstStreamByRelType(

                msURL,

                { u"http://schemas.openxmlformats.org/package/2006/relationships/metadata/thumbnail"_ustr,

                  u"http://purl.oclc.org/ooxml/officeDocument/relationships/metadata/thumbnail"_ustr });

        }

        catch (const uno::Exception&)

        {

            // Not an OOXML; fine

        }

    }

    // Extract the image from the stream.

    Bitmap aThumbnail;

    if (auto pStream = utl::UcbStreamHelper::CreateStream(xIStream, /*CloseStream=*/true))

    {

        Graphic aGraphic = GraphicFilter::GetGraphicFilter().ImportUnloadedGraphic(*pStream);

        aThumbnail = aGraphic.GetBitmap();

    }

    // Note that the preview is returned without scaling it to the desired

    // width.  This gives the caller the chance to take advantage of a

    // possibly larger resolution then was asked for.

    return aThumbnail;

}

ThumbnailView::ThumbnailView(std::unique_ptr<weld::ScrolledWindow> xWindow)

    : mnThumbnailHeight(0)

    , mnDisplayHeight(0)

    , mnVItemSpace(-1)

    , mbAllowVScrollBar(xWindow->get_vpolicy() != VclPolicyType::NEVER)

    , mbSelectOnFocus(true)

    , mpItemAttrs(new ThumbnailItemAttributes)

    , mxScrolledWindow(std::move(xWindow))

{

    ImplInit();

    mxScrolledWindow->connect_vadjustment_value_changed(LINK(this, ThumbnailView, ImplScrollHdl));

}

ThumbnailView::~ThumbnailView()

{

    ImplDeleteItems();

    if (mxAccessible.is())

        mxAccessible->dispose();

    mpItemAttrs.reset();

}

bool ThumbnailView::MouseMove(const MouseEvent& rMEvt)

{

    size_t nItemCount = mFilteredItemList.size();

    Point aPoint = rMEvt.GetPosPixel();

    for (size_t i = 0; i < nItemCount; i++)

    {

        ThumbnailViewItem *pItem = mFilteredItemList[i];

        ::tools::Rectangle aToInvalidate(pItem->updateHighlight(pItem->mbVisible && !rMEvt.IsLeaveWindow(), aPoint));

        if (!aToInvalidate.IsEmpty() && IsReallyVisible())

            Invalidate(aToInvalidate);

    }

    return true;

}

OUString ThumbnailView::RequestHelp(tools::Rectangle& rHelpRect)

{

    if (!mbShowTooltips)

        return OUString();

    Point aPos = rHelpRect.TopLeft();

    size_t nItemCount = mFilteredItemList.size();

    for (size_t i = 0; i < nItemCount; i++)

    {

        ThumbnailViewItem *pItem = mFilteredItemList[i];

        if (!pItem->mbVisible)

            continue;

        const tools::Rectangle& rDrawArea = pItem->getDrawArea();

        if (rDrawArea.Contains(aPos))

        {

            rHelpRect = rDrawArea;

            return pItem->getHelpText();

        }

    }

    return OUString();

}

void ThumbnailView::AppendItem(std::unique_ptr<ThumbnailViewItem> pItem)

{

    if (maFilterFunc(pItem.get()))

    {

        // Save current start,end range, iterator might get invalidated

        size_t nSelStartPos = 0;

        ThumbnailViewItem *pSelStartItem = nullptr;

        if (mpStartSelRange != mFilteredItemList.end())

        {

            pSelStartItem = *mpStartSelRange;

            nSelStartPos = mpStartSelRange - mFilteredItemList.begin();

        }

        mFilteredItemList.push_back(pItem.get());

        mpStartSelRange = pSelStartItem != nullptr ? mFilteredItemList.begin() + nSelStartPos : mFilteredItemList.end();

    }

    mItemList.push_back(std::move(pItem));

}

void ThumbnailView::ImplInit()

{

    mnItemWidth = 0;

    mnItemHeight = 0;

    mnItemPadding = 0;

    mnVisLines = 0;

    mnLines = 0;

    mnFirstLine = 0;

    mnCols = 0;

    mbScroll = false;

    mbHasVisibleItems = false;

    mbShowTooltips = false;

    mbDrawMnemonics = false;

    mbAllowMultiSelection = true;

    maFilterFunc = ViewFilterAll();

    mpStartSelRange = mFilteredItemList.end();

    mfHighlightTransparence = SvtOptionsDrawinglayer::GetTransparentSelectionPercent() * 0.01;

    mpItemAttrs->nMaxTextLength = 0;

    UpdateColors(Application::GetSettings().GetStyleSettings());

    updateItemAttrsFromColors();

}

void ThumbnailView::UpdateColors(const StyleSettings& rSettings)

{

    maFillColor = rSettings.GetFieldColor();

    maTextColor = rSettings.GetWindowTextColor();

    maHighlightColor = rSettings.GetHighlightColor();

    maHighlightTextColor = rSettings.GetHighlightTextColor();

}

void ThumbnailView::updateItemAttrsFromColors()

{

    mpItemAttrs->aFillColor = maFillColor.getBColor();

    mpItemAttrs->aTextColor = maTextColor.getBColor();

    mpItemAttrs->aHighlightColor = maHighlightColor.getBColor();

    mpItemAttrs->aHighlightTextColor = maHighlightTextColor.getBColor();

    mpItemAttrs->fHighlightTransparence = mfHighlightTransparence;

}

void ThumbnailView::ImplDeleteItems()

{

    const size_t n = mItemList.size();

    for ( size_t i = 0; i < n; ++i )

    {

        ThumbnailViewItem *const pItem = mItemList[i].get();

        // deselect all current selected items and fire events

        if (pItem->isSelected())

        {

            pItem->setSelection(false);

            maItemStateHdl.Call(pItem);

            // fire accessible event???

        }

        rtl::Reference<ThumbnailViewItemAcc> xItemAcc = pItem->GetAccessible(false);

        if (xItemAcc.is())

        {

            css::uno::Any aOldAny, aNewAny;

            aOldAny <<= css::uno::Reference<css::accessibility::XAccessible>(pItem->GetAccessible());

            ImplFireAccessibleEvent( css::accessibility::AccessibleEventId::CHILD, aOldAny, aNewAny );

            xItemAcc->dispose();

        }

        mItemList[i].reset();

    }

    mItemList.clear();

    mFilteredItemList.clear();

    mpStartSelRange = mFilteredItemList.end();

}

void ThumbnailView::DrawItem(ThumbnailViewItem const *pItem)

{

    if (pItem->isVisible())

    {

        ::tools::Rectangle aRect = pItem->getDrawArea();

        if (!aRect.IsEmpty())

            Invalidate(aRect);

    }

}

void ThumbnailView::OnItemDblClicked (ThumbnailViewItem*)

{

}

rtl::Reference<comphelper::OAccessible> ThumbnailView::CreateAccessible()

{

    mxAccessible.set(new ThumbnailViewAcc(this));

    return mxAccessible;

}

const rtl::Reference< ThumbnailViewAcc > & ThumbnailView::getAccessible() const

{

    return mxAccessible;

}

void ThumbnailView::CalculateItemPositions(bool bScrollBarUsed)

{

    if (!mnItemHeight || !mnItemWidth)

        return;

    Size        aWinSize = GetOutputSizePixel();

    size_t      nItemCount = mFilteredItemList.size();

    // calculate window scroll ratio

    float nScrollRatio;

    if (bScrollBarUsed)

    {

        nScrollRatio = static_cast<float>(mxScrolledWindow->vadjustment_get_value()) /

                       static_cast<float>(mxScrolledWindow->vadjustment_get_upper() -

                                          mxScrolledWindow->vadjustment_get_page_size());

    }

    else

        nScrollRatio = 0;

    // calculate ScrollBar width

    tools::Long nScrBarWidth = mbAllowVScrollBar ? mxScrolledWindow->get_scroll_thickness() : 0;

    // calculate maximum number of visible columns

    mnCols = static_cast<sal_uInt16>((aWinSize.Width()-nScrBarWidth) / mnItemWidth);

    if (!mnCols)

        mnCols = 1;

    // calculate maximum number of visible rows

    mnVisLines = static_cast<sal_uInt16>(aWinSize.Height() / mnItemHeight);

    // calculate empty space

    tools::Long nHSpace = aWinSize.Width()-nScrBarWidth - mnCols*mnItemWidth;

    tools::Long nVSpace = aWinSize.Height() - mnVisLines*mnItemHeight;

    tools::Long nHItemSpace = nHSpace / (mnCols+1);

    tools::Long nVItemSpace = mnVItemSpace;

    if (nVItemSpace == -1) // auto, split up extra space to use as vertical spacing

        nVItemSpace = nVSpace / (mnVisLines+1);

    // tdf#162510 - calculate maximum number of rows

    size_t nItemCountPinned = 0;

#if !ENABLE_WASM_STRIP_RECENT

    bool bPinnedItems = true;

    for (size_t i = 0; bPinnedItems && i < nItemCount; ++i)

    {

        ThumbnailViewItem& rItem = *mFilteredItemList[i];

        if (auto const pRecentDocsItem = dynamic_cast<RecentDocsViewItem*>(&rItem))

        {

            if (pRecentDocsItem->isPinned())

                ++nItemCountPinned;

            else

                bPinnedItems = false;

        }

    }

#endif

    // calculate maximum number of rows

    // Floor( (M+N-1)/N )==Ceiling( M/N )

    mnLines = (static_cast<tools::Long>(nItemCount - nItemCountPinned) + mnCols - 1) / mnCols;

    // tdf#162510 - add pinned items to number of lines

    mnLines += (static_cast<tools::Long>(nItemCountPinned) + mnCols - 1) / mnCols;

    if ( !mnLines )

        mnLines = 1;

    if ( mnLines <= mnVisLines )

        mnFirstLine = 0;

    else if ( mnFirstLine > o3tl::make_unsigned(mnLines-mnVisLines) )

        mnFirstLine = static_cast<sal_uInt16>(mnLines-mnVisLines);

    mbHasVisibleItems = true;

    tools::Long nFullSteps = (mnLines > mnVisLines) ? mnLines - mnVisLines + 1 : 1;

    tools::Long nItemHeightOffset = mnItemHeight + nVItemSpace;

    tools::Long nHiddenLines = static_cast<tools::Long>((nFullSteps - 1) * nScrollRatio);

    // calculate offsets

    tools::Long nStartX = nHItemSpace;

    tools::Long nStartY = nVItemSpace;

    // calculate and draw items

    tools::Long x = nStartX;

    tools::Long y = nStartY - ((nFullSteps - 1) * nScrollRatio - nHiddenLines) * nItemHeightOffset;

    // draw items

    // Unless we are scrolling (via scrollbar) we just use the precalculated

    // mnFirstLine -- our nHiddenLines calculation takes into account only

    // what the user has done with the scrollbar but not any changes of selection

    // using the keyboard, meaning we could accidentally hide the selected item

    // if we believe the scrollbar (fdo#72287).

    size_t nFirstItem = (bScrollBarUsed ? nHiddenLines : mnFirstLine) * mnCols;

    size_t nLastItem = nFirstItem + (mnVisLines + 1) * mnCols;

    // tdf#162510 - helper for in order to handle accessibility events

    auto handleAccessibleEvent = [&](ThumbnailViewItem& rItem, bool bIsVisible)

    {

        if (ImplHasAccessibleListeners())

        {

            css::uno::Any aOldAny, aNewAny;

            if (bIsVisible)

                aNewAny <<= css::uno::Reference<css::accessibility::XAccessible>(rItem.GetAccessible());

            else

                aOldAny <<= css::uno::Reference<css::accessibility::XAccessible>(rItem.GetAccessible());

            ImplFireAccessibleEvent(css::accessibility::AccessibleEventId::CHILD, aOldAny, aNewAny);

        }

    };

    // tdf#162510 - helper to set visibility and update layout

    auto updateItemLayout = [&](ThumbnailViewItem& rItem, bool bIsVisible, size_t& nVisibleCount)

    {

        if (bIsVisible != rItem.isVisible())

        {

            handleAccessibleEvent(rItem, bIsVisible);

            rItem.show(bIsVisible);

            maItemStateHdl.Call(&rItem);

        }

        if (bIsVisible)

        {

            rItem.setDrawArea(::tools::Rectangle(Point(x, y), Size(mnItemWidth, mnItemHeight)));

            rItem.calculateItemsPosition(mnThumbnailHeight, mnItemPadding,

                                         mpItemAttrs->nMaxTextLength, mpItemAttrs.get());

            if ((nVisibleCount + 1) % mnCols)

                x += mnItemWidth + nHItemSpace;

            else

            {

                x = nStartX;

                y += mnItemHeight + nVItemSpace;

            }

            ++nVisibleCount;

        }

    };

    size_t nCurCountVisible = 0;

#if !ENABLE_WASM_STRIP_RECENT

    // tdf#162510 - process pinned items

    for (size_t i = 0; i < nItemCountPinned; i++)

        updateItemLayout(*mFilteredItemList[i], nFirstItem <= i && i < nLastItem, nCurCountVisible);

    // tdf#162510 - start a new line only if the entire line is not filled with pinned items

    if (nCurCountVisible && nCurCountVisible % mnCols)

    {

        x = nStartX;

        y += mnItemHeight + nVItemSpace;

    }

    // tdf#164102 - adjust first item only if there are any pinned items

    if (const auto nRemainingPinnedSlots = nItemCountPinned % mnCols)

    {

        // tdf#162510 - adjust first item to take into account the new line after pinned items

        const auto nFirstItemAdjustment = mnCols - nRemainingPinnedSlots;

        if (nFirstItemAdjustment <= nFirstItem)

            nFirstItem -= nFirstItemAdjustment;

    }

#endif

    // If want also draw parts of items in the last line,

    // then we add one more line if parts of this line are visible

    nCurCountVisible = 0;

    for (size_t i = nItemCountPinned; i < nItemCount; i++)

        updateItemLayout(*mFilteredItemList[i], nFirstItem <= i && i < nLastItem, nCurCountVisible);

    // check if scroll is needed

    mbScroll = mnLines > mnVisLines;

    mxScrolledWindow->vadjustment_set_upper(mnLines * gnFineness);

    mxScrolledWindow->vadjustment_set_page_size(mnVisLines * gnFineness);

    if (!bScrollBarUsed)

        mxScrolledWindow->vadjustment_set_value(static_cast<tools::Long>(mnFirstLine)*gnFineness);

    tools::Long nPageSize = mnVisLines;

    if ( nPageSize < 1 )

        nPageSize = 1;

    mxScrolledWindow->vadjustment_set_page_increment(nPageSize*gnFineness);

    if (mbAllowVScrollBar)

        mxScrolledWindow->set_vpolicy(mbScroll ? VclPolicyType::ALWAYS : VclPolicyType::NEVER);

}

size_t ThumbnailView::ImplGetItem( const Point& rPos ) const

{

    if ( !mbHasVisibleItems )

    {

        return THUMBNAILVIEW_ITEM_NOTFOUND;

    }

    for (size_t i = 0; i < mFilteredItemList.size(); ++i)

    {

        if (mFilteredItemList[i]->isVisible() && mFilteredItemList[i]->getDrawArea().Contains(rPos))

            return i;

    }

    return THUMBNAILVIEW_ITEM_NOTFOUND;

}

ThumbnailViewItem* ThumbnailView::ImplGetItem( size_t nPos )

{

    return ( nPos < mFilteredItemList.size() ) ? mFilteredItemList[nPos] : nullptr;

}

sal_uInt16 ThumbnailView::ImplGetVisibleItemCount() const

{

    sal_uInt16 nRet = 0;

    const size_t nItemCount = mItemList.size();

    for ( size_t n = 0; n < nItemCount; ++n )

    {

        if ( mItemList[n]->isVisible() )

            ++nRet;

    }

    return nRet;

}

ThumbnailViewItem* ThumbnailView::ImplGetVisibleItem( sal_uInt16 nVisiblePos )

{

    const size_t nItemCount = mItemList.size();

    for ( size_t n = 0; n < nItemCount; ++n )

    {

        ThumbnailViewItem *const pItem = mItemList[n].get();

        if ( pItem->isVisible() && !nVisiblePos-- )

            return pItem;

    }

    return nullptr;

}

void ThumbnailView::ImplFireAccessibleEvent( short nEventId, const css::uno::Any& rOldValue, const css::uno::Any& rNewValue )

{

    if( mxAccessible )

        mxAccessible->FireAccessibleEvent( nEventId, rOldValue, rNewValue );

}

bool ThumbnailView::ImplHasAccessibleListeners() const

{

    return mxAccessible && mxAccessible->HasAccessibleListeners();

}

IMPL_LINK_NOARG(ThumbnailView, ImplScrollHdl, weld::ScrolledWindow&, void)

{

    CalculateItemPositions(true);

    if (IsReallyVisible())

        Invalidate();

}

bool ThumbnailView::KeyInput( const KeyEvent& rKEvt )

{

    bool bHandled = true;

    // Get the last selected item in the list

    size_t nLastPos = 0;

    bool bFoundLast = false;

    for ( tools::Long i = mFilteredItemList.size() - 1; !bFoundLast && i >= 0; --i )

    {

        ThumbnailViewItem* pItem = mFilteredItemList[i];

        if ( pItem->isSelected() )

        {

            nLastPos = i;

            bFoundLast = true;

        }

    }

    bool bValidRange = false;

    bool bHasSelRange = mpStartSelRange != mFilteredItemList.end();

    size_t nNextPos = nLastPos;

    vcl::KeyCode aKeyCode = rKEvt.GetKeyCode();

    ThumbnailViewItem* pNext = nullptr;

    if (aKeyCode.IsShift() && bHasSelRange)

    {

        //If the last element selected is the start range position

        //search for the first selected item

        size_t nSelPos = mpStartSelRange - mFilteredItemList.begin();

        if (nLastPos == nSelPos)

        {

            while (nLastPos && mFilteredItemList[nLastPos-1]->isSelected())

                --nLastPos;

        }

    }

    switch ( aKeyCode.GetCode() )

    {

        case KEY_RIGHT:

            if (!mFilteredItemList.empty())

            {

                if ( bFoundLast && nLastPos + 1 < mFilteredItemList.size() )

                {

                    bValidRange = true;

                    nNextPos = nLastPos + 1;

                }

                pNext = mFilteredItemList[nNextPos];

            }

            break;

        case KEY_LEFT:

            if (!mFilteredItemList.empty())

            {

                if ( nLastPos > 0 )

                {

                    bValidRange = true;

                    nNextPos = nLastPos - 1;

                }

                pNext = mFilteredItemList[nNextPos];

            }

            break;

        case KEY_DOWN:

            if (!mFilteredItemList.empty())

            {

                if ( bFoundLast )

                {

                    //If we are in the second last row just go the one in

                    //the row below, if there's not row below just go to the

                    //last item but for the last row don't do anything.

                    if ( nLastPos + mnCols < mFilteredItemList.size( ) )

                    {

                        bValidRange = true;

                        nNextPos = nLastPos + mnCols;

                    }

                    else

                    {

                        int curRow = nLastPos/mnCols;

                        if (curRow < mnLines-1)

                            nNextPos = mFilteredItemList.size()-1;

                    }

                }

                pNext = mFilteredItemList[nNextPos];

            }

            break;

        case KEY_UP:

            if (!mFilteredItemList.empty())

            {

                if ( nLastPos >= mnCols )

                {

                    bValidRange = true;

                    nNextPos = nLastPos - mnCols;

                }

                pNext = mFilteredItemList[nNextPos];

            }

            break;

        case KEY_RETURN:

            {

                if ( bFoundLast )

                    OnItemDblClicked( mFilteredItemList[nLastPos] );

            }

            [[fallthrough]];

        default:

            bHandled = CustomWidgetController::KeyInput(rKEvt);

    }

    if ( pNext )

    {

        if (aKeyCode.IsShift() && bValidRange && mbAllowMultiSelection)

        {

            std::pair<size_t,size_t> aRange;

            size_t nSelPos = mpStartSelRange - mFilteredItemList.begin();

            if (nLastPos < nSelPos)

            {

                if (nNextPos > nLastPos)

                {

                    if ( nNextPos > nSelPos)

                        aRange = std::make_pair(nLastPos,nNextPos);

                    else

                        aRange = std::make_pair(nLastPos,nNextPos-1);

                }

                else

                {

                    assert(nLastPos > 0);

                    aRange = std::make_pair(nNextPos,nLastPos-1);

                }

            }

            else if (nLastPos == nSelPos)

            {

                if (nNextPos > nLastPos)

                    aRange = std::make_pair(nLastPos+1,nNextPos);

                else

                {

                    assert(nLastPos > 0);

                    aRange = std::make_pair(nNextPos,nLastPos-1);

                }

            }

            else

            {

                if (nNextPos > nLastPos)

                    aRange = std::make_pair(nLastPos+1,nNextPos);

                else

                {

                    if ( nNextPos < nSelPos)

                        aRange = std::make_pair(nNextPos,nLastPos);

                    else

                        aRange = std::make_pair(nNextPos+1,nLastPos);

                }

            }

            for (size_t i = aRange.first; i <= aRange.second; ++i)

            {

                if (i != nSelPos)

                {

                    ThumbnailViewItem *pCurItem = mFilteredItemList[i];

                    pCurItem->setSelection(!pCurItem->isSelected());

                    DrawItem(pCurItem);

                    maItemStateHdl.Call(pCurItem);

                }

            }

        }

        else if (!aKeyCode.IsShift())

        {

            deselectItems();

            SelectItem(pNext->mnId);

            //Mark it as the selection range start position

            mpStartSelRange = mFilteredItemList.begin() + nNextPos;

        }

        MakeItemVisible(pNext->mnId);

    }

    return bHandled;

}

void ThumbnailView::MakeItemVisible( sal_uInt16 nItemId )

{

    // Get the item row

    size_t nPos = 0;

    bool bFound = false;

    for ( size_t i = 0; !bFound && i < mFilteredItemList.size(); ++i )

    {

        ThumbnailViewItem* pItem = mFilteredItemList[i];

        if ( pItem->mnId == nItemId )

        {

            nPos = i;

            bFound = true;

        }

    }

    sal_uInt16 nRow = mnCols ? nPos / mnCols : 0;

    // Move the visible rows as little as possible to include that one

    if ( nRow < mnFirstLine )

        mnFirstLine = nRow;

    else if ( nRow > mnFirstLine + mnVisLines )

        mnFirstLine = nRow - mnVisLines;

    CalculateItemPositions();

    Invalidate();

}

bool ThumbnailView::MouseButtonDown( const MouseEvent& rMEvt )

{

    GrabFocus();

    if (!rMEvt.IsLeft())

    {

        return CustomWidgetController::MouseButtonDown( rMEvt );

    }

    size_t nPos = ImplGetItem(rMEvt.GetPosPixel());

    ThumbnailViewItem* pItem = ImplGetItem(nPos);

    if ( !pItem )

    {

        deselectItems();

        return CustomWidgetController::MouseButtonDown( rMEvt );

    }

    if ( rMEvt.GetClicks() == 2 )

    {

        OnItemDblClicked(pItem);

        return true;

    }

    if(rMEvt.GetClicks() == 1)

    {

        if (rMEvt.IsMod1())

        {

            //Keep selected item group state and just invert current desired one state

            pItem->setSelection(!pItem->isSelected());

            //This one becomes the selection range start position if it changes its state to selected otherwise resets it

            mpStartSelRange = pItem->isSelected() ? mFilteredItemList.begin() + nPos : mFilteredItemList.end();

        }

        else if (rMEvt.IsShift() && mpStartSelRange != mFilteredItemList.end())

        {

            std::pair<size_t,size_t> aNewRange;

            aNewRange.first = mpStartSelRange - mFilteredItemList.begin();

            aNewRange.second = nPos;

            if (aNewRange.first > aNewRange.second)

                std::swap(aNewRange.first,aNewRange.second);

            //Deselect the ones outside of it

            for (size_t i = 0, n = mFilteredItemList.size(); i < n; ++i)

            {

                ThumbnailViewItem *pCurItem  = mFilteredItemList[i];