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** Contact: Nokia Corporation (qt-info@nokia.com)
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** This file is part of the QtDeclarative module of the Qt Toolkit.
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** this package.
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****************************************************************************/

#include "qdeclarativegridview_p.h"

#include "qdeclarativevisualitemmodel_p.h"
#include "qdeclarativeflickable_p_p.h"

#include <qdeclarativeeasefollow_p.h>
#include <qdeclarativeguard_p.h>

#include <qlistmodelinterface_p.h>
#include <QKeyEvent>

#include <math.h>

QT_BEGIN_NAMESPACE


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

class FxGridItem
{
public:
    FxGridItem(QDeclarativeItem *i, QDeclarativeGridView *v) : item(i), view(v) {
        attached = static_cast<QDeclarativeGridViewAttached*>(qmlAttachedPropertiesObject<QDeclarativeGridView>(item));
        if (attached)
            attached->m_view = view;
    }
    ~FxGridItem() {}

    qreal rowPos() const { return (view->flow() == QDeclarativeGridView::LeftToRight ? item->y() : item->x()); }
    qreal colPos() const { return (view->flow() == QDeclarativeGridView::LeftToRight ? item->x() : item->y()); }
    qreal endRowPos() const {
        return view->flow() == QDeclarativeGridView::LeftToRight
                                ? item->y() + view->cellHeight() - 1
                                : item->x() + view->cellWidth() - 1;
    }
    void setPosition(qreal col, qreal row) {
        if (view->flow() == QDeclarativeGridView::LeftToRight) {
            item->setPos(QPointF(col, row));
        } else {
            item->setPos(QPointF(row, col));
        }
    }
    bool contains(int x, int y) const {
        return (x >= item->x() && x < item->x() + view->cellWidth() &&
                y >= item->y() && y < item->y() + view->cellHeight());
    }

    QDeclarativeItem *item;
    QDeclarativeGridView *view;
    QDeclarativeGridViewAttached *attached;
    int index;
};

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

class QDeclarativeGridViewPrivate : public QDeclarativeFlickablePrivate
{
    Q_DECLARE_PUBLIC(QDeclarativeGridView)

public:
    QDeclarativeGridViewPrivate()
    : currentItem(0), flow(QDeclarativeGridView::LeftToRight)
    , visibleIndex(0) , currentIndex(-1)
    , cellWidth(100), cellHeight(100), columns(1), requestedIndex(-1)
    , highlightRangeStart(0), highlightRangeEnd(0), highlightRange(QDeclarativeGridView::NoHighlightRange)
    , highlightComponent(0), highlight(0), trackedItem(0)
    , moveReason(Other), buffer(0), highlightXAnimator(0), highlightYAnimator(0)
    , bufferMode(NoBuffer), snapMode(QDeclarativeGridView::NoSnap)
    , ownModel(false), wrap(false), autoHighlight(true)
    , fixCurrentVisibility(false), lazyRelease(false), layoutScheduled(false)
    , deferredRelease(false), haveHighlightRange(false) {}

    void init();
    void clear();
    FxGridItem *createItem(int modelIndex);
    void releaseItem(FxGridItem *item);
    void refill(qreal from, qreal to, bool doBuffer=false);

    void updateGrid();
    void scheduleLayout();
    void layout();
    void updateUnrequestedIndexes();
    void updateUnrequestedPositions();
    void updateTrackedItem();
    void createHighlight();
    void updateHighlight();
    void updateCurrent(int modelIndex);
    void fixupPosition();

    FxGridItem *visibleItem(int modelIndex) const {
        if (modelIndex >= visibleIndex && modelIndex < visibleIndex + visibleItems.count()) {
            for (int i = modelIndex - visibleIndex; i < visibleItems.count(); ++i) {
                FxGridItem *item = visibleItems.at(i);
                if (item->index == modelIndex)
                    return item;
            }
        }
        return 0;
    }

    qreal position() const {
        Q_Q(const QDeclarativeGridView);
        return flow == QDeclarativeGridView::LeftToRight ? q->contentY() : q->contentX();
    }
    void setPosition(qreal pos) {
        Q_Q(QDeclarativeGridView);
        if (flow == QDeclarativeGridView::LeftToRight)
            q->setContentY(pos);
        else
            q->setContentX(pos);
    }
    int size() const {
        Q_Q(const QDeclarativeGridView);
        return flow == QDeclarativeGridView::LeftToRight ? q->height() : q->width();
    }
    qreal startPosition() const {
        qreal pos = 0;
        if (!visibleItems.isEmpty())
            pos = visibleItems.first()->rowPos() - visibleIndex / columns * rowSize();
        return pos;
    }

    qreal endPosition() const {
        qreal pos = 0;
        if (model && model->count())
            pos = rowPosAt(model->count() - 1) + rowSize();
        return pos;
    }

    bool isValid() const {
        return model && model->count() && model->isValid();
    }

    int rowSize() const {
        return flow == QDeclarativeGridView::LeftToRight ? cellHeight : cellWidth;
    }
    int colSize() const {
        return flow == QDeclarativeGridView::LeftToRight ? cellWidth : cellHeight;
    }

    qreal colPosAt(int modelIndex) const {
        if (FxGridItem *item = visibleItem(modelIndex))
            return item->colPos();
        if (!visibleItems.isEmpty()) {
            if (modelIndex < visibleIndex) {
                int count = (visibleIndex - modelIndex) % columns;
                int col = visibleItems.first()->colPos() / colSize();
                col = (columns - count + col) % columns;
                return col * colSize();
            } else {
                int count = columns - 1 - (modelIndex - visibleItems.last()->index - 1) % columns;
                return visibleItems.last()->colPos() - count * colSize();
            }
        } else {
            return (modelIndex % columns) * colSize();
        }
        return 0;
    }
    qreal rowPosAt(int modelIndex) const {
        if (FxGridItem *item = visibleItem(modelIndex))
            return item->rowPos();
        if (!visibleItems.isEmpty()) {
            if (modelIndex < visibleIndex) {
                int firstCol = visibleItems.first()->colPos() / colSize();
                int col = visibleIndex - modelIndex + (columns - firstCol - 1);
                int rows = col / columns;
                return visibleItems.first()->rowPos() - rows * rowSize();
            } else {
                int count = modelIndex - visibleItems.last()->index;
                int col = visibleItems.last()->colPos() + count * colSize();
                int rows = col / (columns * colSize());
                return visibleItems.last()->rowPos() + rows * rowSize();
            }
        } else {
             return (modelIndex / columns) * rowSize();
        }
        return 0;
    }

    FxGridItem *firstVisibleItem() const {
        const qreal pos = position();
        for (int i = 0; i < visibleItems.count(); ++i) {
            FxGridItem *item = visibleItems.at(i);
            if (item->index != -1 && item->endRowPos() > pos)
                return item;
        }
        return visibleItems.count() ? visibleItems.first() : 0;
    }

    // Map a model index to visibleItems list index.
    // These may differ if removed items are still present in the visible list,
    // e.g. doing a removal animation
    int mapFromModel(int modelIndex) const {
        if (modelIndex < visibleIndex || modelIndex >= visibleIndex + visibleItems.count())
            return -1;
        for (int i = 0; i < visibleItems.count(); ++i) {
            FxGridItem *listItem = visibleItems.at(i);
            if (listItem->index == modelIndex)
                return i + visibleIndex;
            if (listItem->index > modelIndex)
                return -1;
        }
        return -1; // Not in visibleList
    }

    qreal snapPosAt(qreal pos) {
        qreal snapPos = 0;
        if (!visibleItems.isEmpty()) {
            pos += rowSize()/2;
            snapPos = visibleItems.first()->rowPos() - visibleIndex / columns * rowSize();
            snapPos = pos - fmodf(pos - snapPos, qreal(rowSize()));
        }
        return snapPos;
    }

    int snapIndex() {
        int index = currentIndex;
        for (int i = 0; i < visibleItems.count(); ++i) {
            FxGridItem *item = visibleItems[i];
            if (item->index == -1)
                continue;
            qreal itemTop = item->rowPos();
            if (itemTop >= highlight->rowPos()-rowSize()/2 && itemTop < highlight->rowPos()+rowSize()/2) {
                index = item->index;
                if (item->colPos() >= highlight->colPos()-colSize()/2 && item->colPos() < highlight->colPos()+colSize()/2)
                    return item->index;
            }
        }
        return index;
    }

    virtual void itemGeometryChanged(QDeclarativeItem *item, const QRectF &newGeometry, const QRectF &oldGeometry) {
        Q_Q(const QDeclarativeGridView);
        QDeclarativeFlickablePrivate::itemGeometryChanged(item, newGeometry, oldGeometry);
        if (item == q) {
            if (newGeometry.height() != oldGeometry.height()
                || newGeometry.width() != oldGeometry.width()) {
                if (q->isComponentComplete()) {
                    updateGrid();
                    scheduleLayout();
                }
            }
        }
    }

    virtual void fixup(AxisData &data, qreal minExtent, qreal maxExtent);
    virtual void flick(AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize,
                QDeclarativeTimeLineCallback::Callback fixupCallback, qreal velocity);

    // for debugging only
    void checkVisible() const {
        int skip = 0;
        for (int i = 0; i < visibleItems.count(); ++i) {
            FxGridItem *listItem = visibleItems.at(i);
            if (listItem->index == -1) {
                ++skip;
            } else if (listItem->index != visibleIndex + i - skip) {
                for (int j = 0; j < visibleItems.count(); j++)
                    qDebug() << " index" << j << "item index" << visibleItems.at(j)->index;
                qFatal("index %d %d %d", visibleIndex, i, listItem->index);
            }
        }
    }

    QDeclarativeGuard<QDeclarativeVisualModel> model;
    QVariant modelVariant;
    QList<FxGridItem*> visibleItems;
    QHash<QDeclarativeItem*,int> unrequestedItems;
    FxGridItem *currentItem;
    QDeclarativeGridView::Flow flow;
    int visibleIndex;
    int currentIndex;
    int cellWidth;
    int cellHeight;
    int columns;
    int requestedIndex;
    qreal highlightRangeStart;
    qreal highlightRangeEnd;
    QDeclarativeGridView::HighlightRangeMode highlightRange;
    QDeclarativeComponent *highlightComponent;
    FxGridItem *highlight;
    FxGridItem *trackedItem;
    enum MovementReason { Other, SetIndex, Mouse };
    MovementReason moveReason;
    int buffer;
    QDeclarativeEaseFollow *highlightXAnimator;
    QDeclarativeEaseFollow *highlightYAnimator;
    enum BufferMode { NoBuffer = 0x00, BufferBefore = 0x01, BufferAfter = 0x02 };
    BufferMode bufferMode;
    QDeclarativeGridView::SnapMode snapMode;

    bool ownModel : 1;
    bool wrap : 1;
    bool autoHighlight : 1;
    bool fixCurrentVisibility : 1;
    bool lazyRelease : 1;
    bool layoutScheduled : 1;
    bool deferredRelease : 1;
    bool haveHighlightRange : 1;
};

void QDeclarativeGridViewPrivate::init()
{
    Q_Q(QDeclarativeGridView);
    q->setFlag(QGraphicsItem::ItemIsFocusScope);
    q->setFlickDirection(QDeclarativeFlickable::VerticalFlick);
    addItemChangeListener(this, Geometry);
}

void QDeclarativeGridViewPrivate::clear()
{
    for (int i = 0; i < visibleItems.count(); ++i)
        releaseItem(visibleItems.at(i));
    visibleItems.clear();
    visibleIndex = 0;
    releaseItem(currentItem);
    currentItem = 0;
    createHighlight();
    trackedItem = 0;
}

FxGridItem *QDeclarativeGridViewPrivate::createItem(int modelIndex)
{
    Q_Q(QDeclarativeGridView);
    // create object
    requestedIndex = modelIndex;
    FxGridItem *listItem = 0;
    if (QDeclarativeItem *item = model->item(modelIndex, false)) {
        listItem = new FxGridItem(item, q);
        listItem->index = modelIndex;
        listItem->item->setZValue(1);
        // complete
        model->completeItem();
        listItem->item->setParentItem(q->viewport());
        unrequestedItems.remove(listItem->item);
    }
    requestedIndex = -1;
    return listItem;
}


void QDeclarativeGridViewPrivate::releaseItem(FxGridItem *item)
{
    Q_Q(QDeclarativeGridView);
    if (!item || !model)
        return;
    if (trackedItem == item) {
        QObject::disconnect(trackedItem->item, SIGNAL(yChanged()), q, SLOT(trackedPositionChanged()));
        QObject::disconnect(trackedItem->item, SIGNAL(xChanged()), q, SLOT(trackedPositionChanged()));
        trackedItem = 0;
    }
    if (model->release(item->item) == 0) {
        // item was not destroyed, and we no longer reference it.
        unrequestedItems.insert(item->item, model->indexOf(item->item, q));
    }
    delete item;
}

void QDeclarativeGridViewPrivate::refill(qreal from, qreal to, bool doBuffer)
{
    Q_Q(QDeclarativeGridView);
    if (!isValid() || !q->isComponentComplete())
        return;

    qreal bufferFrom = from - buffer;
    qreal bufferTo = to + buffer;
    qreal fillFrom = from;
    qreal fillTo = to;
    if (doBuffer && (bufferMode & BufferAfter))
        fillTo = bufferTo;
    if (doBuffer && (bufferMode & BufferBefore))
        fillFrom = bufferFrom;

    bool changed = false;

    int colPos = colPosAt(visibleIndex);
    int rowPos = rowPosAt(visibleIndex);
    int modelIndex = visibleIndex;
    if (visibleItems.count()) {
        rowPos = visibleItems.last()->rowPos();
        colPos = visibleItems.last()->colPos() + colSize();
        if (colPos > colSize() * (columns-1)) {
            colPos = 0;
            rowPos += rowSize();
        }
        int i = visibleItems.count() - 1;
        while (i > 0 && visibleItems.at(i)->index == -1)
            --i;
        modelIndex = visibleItems.at(i)->index + 1;
    }
    int colNum = colPos / colSize();

    FxGridItem *item = 0;

    // Item creation and release is staggered in order to avoid
    // creating/releasing multiple items in one frame
    // while flicking (as much as possible).
    while (modelIndex < model->count() && rowPos <= fillTo + rowSize()*(columns - colNum)/(columns+1)) {
//        qDebug() << "refill: append item" << modelIndex;
        if (!(item = createItem(modelIndex)))
            break;
        item->setPosition(colPos, rowPos);
        visibleItems.append(item);
        colPos += colSize();
        colNum++;
        if (colPos > colSize() * (columns-1)) {
            colPos = 0;
            colNum = 0;
            rowPos += rowSize();
        }
        ++modelIndex;
        changed = true;
        if (doBuffer) // never buffer more than one item per frame
            break;
    }

    if (visibleItems.count()) {
        rowPos = visibleItems.first()->rowPos();
        colPos = visibleItems.first()->colPos() - colSize();
        if (colPos < 0) {
            colPos = colSize() * (columns - 1);
            rowPos -= rowSize();
        }
    }
    colNum = colPos / colSize();
    while (visibleIndex > 0 && rowPos + rowSize() - 1 >= fillFrom - rowSize()*(colNum+1)/(columns+1)){
//        qDebug() << "refill: prepend item" << visibleIndex-1 << "top pos" << rowPos << colPos;
        if (!(item = createItem(visibleIndex-1)))
            break;
        --visibleIndex;
        item->setPosition(colPos, rowPos);
        visibleItems.prepend(item);
        colPos -= colSize();
        colNum--;
        if (colPos < 0) {
            colPos = colSize() * (columns - 1);
            colNum = columns-1;
            rowPos -= rowSize();
        }
        changed = true;
        if (doBuffer) // never buffer more than one item per frame
            break;
    }

    if (!lazyRelease || !changed || deferredRelease) { // avoid destroying items in the same frame that we create
        while (visibleItems.count() > 1
               && (item = visibleItems.first())
                    && item->endRowPos() < bufferFrom - rowSize()*(item->colPos()/colSize()+1)/(columns+1)) {
            if (item->attached->delayRemove())
                break;
//            qDebug() << "refill: remove first" << visibleIndex << "top end pos" << item->endRowPos();
            if (item->index != -1)
                visibleIndex++;
            visibleItems.removeFirst();
            releaseItem(item);
            changed = true;
        }
        while (visibleItems.count() > 1
               && (item = visibleItems.last())
                    && item->rowPos() > bufferTo + rowSize()*(columns - item->colPos()/colSize())/(columns+1)) {
            if (item->attached->delayRemove())
                break;
//            qDebug() << "refill: remove last" << visibleIndex+visibleItems.count()-1;
            visibleItems.removeLast();
            releaseItem(item);
            changed = true;
        }
        deferredRelease = false;
    } else {
        deferredRelease = true;
    }
    if (changed) {
        if (flow == QDeclarativeGridView::LeftToRight)
            q->setContentHeight(endPosition() - startPosition());
        else
            q->setContentWidth(endPosition() - startPosition());
    } else if (!doBuffer && buffer && bufferMode != NoBuffer) {
        refill(from, to, true);
    }
    lazyRelease = false;
}

void QDeclarativeGridViewPrivate::updateGrid()
{
    Q_Q(QDeclarativeGridView);
    columns = (int)qMax((flow == QDeclarativeGridView::LeftToRight ? q->width() : q->height()) / colSize(), qreal(1.));
    if (isValid()) {
        if (flow == QDeclarativeGridView::LeftToRight)
            q->setContentHeight(endPosition() - startPosition());
        else
            q->setContentWidth(endPosition() - startPosition());
    }
}

void QDeclarativeGridViewPrivate::scheduleLayout()
{
    Q_Q(QDeclarativeGridView);
    if (!layoutScheduled) {
        layoutScheduled = true;
        QCoreApplication::postEvent(q, new QEvent(QEvent::User), Qt::HighEventPriority);
    }
}

void QDeclarativeGridViewPrivate::layout()
{
    Q_Q(QDeclarativeGridView);
    layoutScheduled = false;
    if (visibleItems.count()) {
        qreal rowPos = visibleItems.first()->rowPos();
        qreal colPos = visibleItems.first()->colPos();
        int col = visibleIndex % columns;
        if (colPos != col * colSize()) {
            colPos = col * colSize();
            visibleItems.first()->setPosition(colPos, rowPos);
        }
        for (int i = 1; i < visibleItems.count(); ++i) {
            FxGridItem *item = visibleItems.at(i);
            colPos += colSize();
            if (colPos > colSize() * (columns-1)) {
                colPos = 0;
                rowPos += rowSize();
            }
            item->setPosition(colPos, rowPos);
        }
    }
    q->refill();
    updateHighlight();
    moveReason = Other;
    if (flow == QDeclarativeGridView::LeftToRight) {
        q->setContentHeight(endPosition() - startPosition());
        fixupY();
    } else {
        q->setContentWidth(endPosition() - startPosition());
        fixupX();
    }
    updateUnrequestedPositions();
}

void QDeclarativeGridViewPrivate::updateUnrequestedIndexes()
{
    Q_Q(QDeclarativeGridView);
    QHash<QDeclarativeItem*,int>::iterator it;
    for (it = unrequestedItems.begin(); it != unrequestedItems.end(); ++it)
        *it = model->indexOf(it.key(), q);
}

void QDeclarativeGridViewPrivate::updateUnrequestedPositions()
{
    QHash<QDeclarativeItem*,int>::const_iterator it;
    for (it = unrequestedItems.begin(); it != unrequestedItems.end(); ++it) {
        if (flow == QDeclarativeGridView::LeftToRight) {
            it.key()->setPos(QPointF(colPosAt(*it), rowPosAt(*it)));
        } else {
            it.key()->setPos(QPointF(rowPosAt(*it), colPosAt(*it)));
        }
    }
}

void QDeclarativeGridViewPrivate::updateTrackedItem()
{
    Q_Q(QDeclarativeGridView);
    FxGridItem *item = currentItem;
    if (highlight)
        item = highlight;

    FxGridItem *oldTracked = trackedItem;

    if (trackedItem && item != trackedItem) {
        QObject::disconnect(trackedItem->item, SIGNAL(yChanged()), q, SLOT(trackedPositionChanged()));
        QObject::disconnect(trackedItem->item, SIGNAL(xChanged()), q, SLOT(trackedPositionChanged()));
        trackedItem = 0;
    }

    if (!trackedItem && item) {
        trackedItem = item;
        QObject::connect(trackedItem->item, SIGNAL(yChanged()), q, SLOT(trackedPositionChanged()));
        QObject::connect(trackedItem->item, SIGNAL(xChanged()), q, SLOT(trackedPositionChanged()));
    }
    if (trackedItem && trackedItem != oldTracked)
        q->trackedPositionChanged();
}

void QDeclarativeGridViewPrivate::createHighlight()
{
    Q_Q(QDeclarativeGridView);
    bool changed = false;
    if (highlight) {
        if (trackedItem == highlight)
            trackedItem = 0;
        delete highlight->item;
        delete highlight;
        highlight = 0;
        delete highlightXAnimator;
        delete highlightYAnimator;
        highlightXAnimator = 0;
        highlightYAnimator = 0;
        changed = true;
    }

    if (currentItem) {
        QDeclarativeItem *item = 0;
        if (highlightComponent) {
            QDeclarativeContext *highlightContext = new QDeclarativeContext(qmlContext(q));
            QObject *nobj = highlightComponent->create(highlightContext);
            if (nobj) {
                QDeclarative_setParent_noEvent(highlightContext, nobj);
                item = qobject_cast<QDeclarativeItem *>(nobj);
                if (!item)
                    delete nobj;
            } else {
                delete highlightContext;
            }
        } else {
            item = new QDeclarativeItem;
            QDeclarative_setParent_noEvent(item, q->viewport());
            item->setParentItem(q->viewport());
        }
        if (item) {
            QDeclarative_setParent_noEvent(item, q->viewport());
            item->setParentItem(q->viewport());
            highlight = new FxGridItem(item, q);
            highlightXAnimator = new QDeclarativeEaseFollow(q);
            highlightXAnimator->setTarget(QDeclarativeProperty(highlight->item, QLatin1String("x")));
            highlightXAnimator->setDuration(150);
            highlightXAnimator->setEnabled(autoHighlight);
            highlightYAnimator = new QDeclarativeEaseFollow(q);
            highlightYAnimator->setTarget(QDeclarativeProperty(highlight->item, QLatin1String("y")));
            highlightYAnimator->setDuration(150);
            highlightYAnimator->setEnabled(autoHighlight);
            changed = true;
        }
    }
    if (changed)
        emit q->highlightItemChanged();
}

void QDeclarativeGridViewPrivate::updateHighlight()
{
    if ((!currentItem && highlight) || (currentItem && !highlight))
        createHighlight();
    if (currentItem && autoHighlight && highlight && !moving) {
        // auto-update highlight
        highlightXAnimator->setSourceValue(currentItem->item->x());
        highlightYAnimator->setSourceValue(currentItem->item->y());
        highlight->item->setWidth(currentItem->item->width());
        highlight->item->setHeight(currentItem->item->height());
    }
    updateTrackedItem();
}

void QDeclarativeGridViewPrivate::updateCurrent(int modelIndex)
{
    Q_Q(QDeclarativeGridView);
    if (!q->isComponentComplete() || !isValid() || modelIndex < 0 || modelIndex >= model->count()) {
        if (currentItem) {
            currentItem->attached->setIsCurrentItem(false);
            releaseItem(currentItem);
            currentItem = 0;
            currentIndex = -1;
            updateHighlight();
            emit q->currentIndexChanged();
        }
        return;
    }

    if (currentItem && currentIndex == modelIndex) {
        updateHighlight();
        return;
    }

    FxGridItem *oldCurrentItem = currentItem;
    currentIndex = modelIndex;
    currentItem = createItem(modelIndex);
    fixCurrentVisibility = true;
    if (oldCurrentItem && (!currentItem || oldCurrentItem->item != currentItem->item))
        oldCurrentItem->attached->setIsCurrentItem(false);
    if (currentItem) {
        currentItem->setPosition(colPosAt(modelIndex), rowPosAt(modelIndex));
        currentItem->item->setFocus(true);
        currentItem->attached->setIsCurrentItem(true);
    }
    updateHighlight();
    emit q->currentIndexChanged();
    releaseItem(oldCurrentItem);
}

void QDeclarativeGridViewPrivate::fixupPosition()
{
    moveReason = Other;
    if (flow == QDeclarativeGridView::LeftToRight)
        fixupY();
    else
        fixupX();
}

void QDeclarativeGridViewPrivate::fixup(AxisData &data, qreal minExtent, qreal maxExtent)
{
    Q_Q(QDeclarativeGridView);

    if ((&data == &vData && !q->yflick())
        || (&data == &hData && !q->xflick())
        || data.move.timeLine())
        return;

    int oldDuration = fixupDuration;
    fixupDuration = moveReason == Mouse ? fixupDuration : 0;

    if (haveHighlightRange && highlightRange == QDeclarativeGridView::StrictlyEnforceRange) {
        if (currentItem && currentItem->rowPos() - position() != highlightRangeStart) {
            qreal pos = currentItem->rowPos() - highlightRangeStart;
            timeline.reset(data.move);
            if (fixupDuration) {
                timeline.move(data.move, -pos, QEasingCurve(QEasingCurve::InOutQuad), fixupDuration/2);
            } else {
                data.move.setValue(-pos);
                q->viewportMoved();
            }
            vTime = timeline.time();
        }
    } else if (snapMode != QDeclarativeGridView::NoSnap) {
        qreal pos = -snapPosAt(-(data.move.value() - highlightRangeStart)) + highlightRangeStart;
        pos = qMin(qMax(pos, maxExtent), minExtent);
        qreal dist = qAbs(data.move.value() - pos);
        if (dist > 0) {
            timeline.reset(data.move);
            if (fixupDuration) {
                timeline.move(data.move, pos, QEasingCurve(QEasingCurve::InOutQuad), fixupDuration/2);
            } else {
                data.move.setValue(pos);
                q->viewportMoved();
            }
            vTime = timeline.time();
        }
    } else {
        QDeclarativeFlickablePrivate::fixup(data, minExtent, maxExtent);
    }
    fixupDuration = oldDuration;
}

void QDeclarativeGridViewPrivate::flick(AxisData &data, qreal minExtent, qreal maxExtent, qreal vSize,
                                        QDeclarativeTimeLineCallback::Callback fixupCallback, qreal velocity)
{
    Q_Q(QDeclarativeGridView);

    moveReason = Mouse;
    if ((!haveHighlightRange || highlightRange != QDeclarativeGridView::StrictlyEnforceRange) && snapMode == QDeclarativeGridView::NoSnap) {
        QDeclarativeFlickablePrivate::flick(data, minExtent, maxExtent, vSize, fixupCallback, velocity);
        return;
    }
    qreal maxDistance = 0;
    // -ve velocity means list is moving up
    if (velocity > 0) {
        if (data.move.value() < minExtent) {
            if (snapMode == QDeclarativeGridView::SnapOneRow) {
                if (FxGridItem *item = firstVisibleItem())
                    maxDistance = qAbs(item->rowPos() + data.move.value());
            } else {
                maxDistance = qAbs(minExtent - data.move.value());
            }
        }
        if (snapMode != QDeclarativeGridView::SnapToRow && highlightRange != QDeclarativeGridView::StrictlyEnforceRange)
            data.flickTarget = minExtent;
    } else {
        if (data.move.value() > maxExtent) {
            if (snapMode == QDeclarativeGridView::SnapOneRow) {
                qreal pos = snapPosAt(-data.move.value()) + rowSize();
                maxDistance = qAbs(pos + data.move.value());
            } else {
                maxDistance = qAbs(maxExtent - data.move.value());
            }
        }
        if (snapMode != QDeclarativeGridView::SnapToRow && highlightRange != QDeclarativeGridView::StrictlyEnforceRange)
            data.flickTarget = maxExtent;
    }
    if ((maxDistance > 0 || overShoot) && (snapMode != QDeclarativeGridView::NoSnap || highlightRange == QDeclarativeGridView::StrictlyEnforceRange)) {
        // This mode requires the grid to stop exactly on a row boundary.
        qreal v = velocity;
        if (maxVelocity != -1 && maxVelocity < qAbs(v)) {
            if (v < 0)
                v = -maxVelocity;
            else
                v = maxVelocity;
        }
        qreal accel = deceleration;
        qreal v2 = v * v;
        qreal overshootDist = 0.0;
        if (maxDistance > 0.0 && v2 / (2.0f * maxDistance) < accel) {
            // + rowSize()/4 to encourage moving at least one item in the flick direction
            qreal dist = v2 / (accel * 2.0) + rowSize()/4;
            if (v > 0)
                dist = -dist;
            data.flickTarget = -snapPosAt(-(data.move.value() - highlightRangeStart) + dist) + highlightRangeStart;
            dist = -data.flickTarget + data.move.value();
            accel = v2 / (2.0f * qAbs(dist));
        } else {
            data.flickTarget = velocity > 0 ? minExtent : maxExtent;
            overshootDist = overShoot ? overShootDistance(v, vSize) : 0;
        }
        timeline.reset(data.move);
        timeline.accel(data.move, v, accel, maxDistance + overshootDist);
        timeline.callback(QDeclarativeTimeLineCallback(&data.move, fixupCallback, this));
        flicked = true;
        emit q->flickingChanged();
        emit q->flickStarted();
    } else {
        timeline.reset(data.move);
        fixup(data, minExtent, maxExtent);
    }
}


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

/*!
    \qmlclass GridView QDeclarativeGridView
    \since 4.7
    \inherits Flickable
    \brief The GridView item provides a grid view of items provided by a model.

    The model is typically provided by a QAbstractListModel "C++ model object",
    but can also be created directly in QML.

    The items are laid out top to bottom (vertically) or left to right (horizontally)
    and may be flicked to scroll.

    The below example creates a very simple grid, using a QML model.

    \image gridview.png

    \snippet doc/src/snippets/declarative/gridview/gridview.qml 3

    The model is defined as a ListModel using QML:
    \quotefile doc/src/snippets/declarative/gridview/dummydata/ContactModel.qml

    In this case ListModel is a handy way for us to test our UI.  In practice
    the model would be implemented in C++, or perhaps via a SQL data source.

    Note that views do not enable \e clip automatically.  If the view
    is not clipped by another item or the screen, it will be necessary
    to set \e {clip: true} in order to have the out of view items clipped
    nicely.
*/
QDeclarativeGridView::QDeclarativeGridView(QDeclarativeItem *parent)
    : QDeclarativeFlickable(*(new QDeclarativeGridViewPrivate), parent)
{
    Q_D(QDeclarativeGridView);
    d->init();
}

QDeclarativeGridView::~QDeclarativeGridView()
{
    Q_D(QDeclarativeGridView);
    d->clear();
    if (d->ownModel)
        delete d->model;
}

/*!
    \qmlattachedproperty bool GridView::isCurrentItem
    This attched property is true if this delegate is the current item; otherwise false.

    It is attached to each instance of the delegate.
*/

/*!
    \qmlattachedproperty GridView GridView::view
    This attached property holds the view that manages this delegate instance.

    It is attached to each instance of the delegate.
*/

/*!
    \qmlattachedproperty bool GridView::delayRemove
    This attached property holds whether the delegate may be destroyed.

    It is attached to each instance of the delegate.

    It is sometimes necessary to delay the destruction of an item
    until an animation completes.

    The example below ensures that the animation completes before
    the item is removed from the grid.

    \code
    Component {
        id: myDelegate
        Item {
            id: wrapper
            SequentialAnimation on GridView.onRemove {
                PropertyAction { target: wrapper.GridView; property: "delayRemove"; value: true }
                NumberAnimation { target: wrapper; property: "scale"; to: 0; duration: 250; easing.type: "InOutQuad" }
                PropertyAction { target: wrapper.GridView; property: "delayRemove"; value: false }
            }
        }
    }
    \endcode
*/

/*!
    \qmlattachedsignal GridView::onAdd()
    This attached handler is called immediately after an item is added to the view.
*/

/*!
    \qmlattachedsignal GridView::onRemove()
    This attached handler is called immediately before an item is removed from the view.
*/


/*!
  \qmlproperty model GridView::model
  This property holds the model providing data for the grid.

  The model provides a set of data that is used to create the items
  for the view.  For large or dynamic datasets the model is usually
  provided by a C++ model object.  The C++ model object must be a \l
  {QAbstractItemModel} subclass, a VisualModel, or a simple list.

  \sa {qmlmodels}{Data Models}
*/
QVariant QDeclarativeGridView::model() const
{
    Q_D(const QDeclarativeGridView);
    return d->modelVariant;
}

void QDeclarativeGridView::setModel(const QVariant &model)
{
    Q_D(QDeclarativeGridView);
    if (d->modelVariant == model)
        return;
    if (d->model) {
        disconnect(d->model, SIGNAL(itemsInserted(int,int)), this, SLOT(itemsInserted(int,int)));
        disconnect(d->model, SIGNAL(itemsRemoved(int,int)), this, SLOT(itemsRemoved(int,int)));
        disconnect(d->model, SIGNAL(itemsMoved(int,int,int)), this, SLOT(itemsMoved(int,int,int)));
        disconnect(d->model, SIGNAL(modelReset()), this, SLOT(modelReset()));
        disconnect(d->model, SIGNAL(createdItem(int, QDeclarativeItem*)), this, SLOT(createdItem(int,QDeclarativeItem*)));
        disconnect(d->model, SIGNAL(destroyingItem(QDeclarativeItem*)), this, SLOT(destroyingItem(QDeclarativeItem*)));
    }
    d->clear();
    d->modelVariant = model;
    QObject *object = qvariant_cast<QObject*>(model);
    QDeclarativeVisualModel *vim = 0;
    if (object && (vim = qobject_cast<QDeclarativeVisualModel *>(object))) {
        if (d->ownModel) {
            delete d->model;
            d->ownModel = false;
        }
        d->model = vim;
    } else {
        if (!d->ownModel) {
            d->model = new QDeclarativeVisualDataModel(qmlContext(this));
            d->ownModel = true;
        }
        if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model))
            dataModel->setModel(model);
    }
    if (d->model) {
        if (isComponentComplete()) {
            refill();
            if (d->currentIndex >= d->model->count() || d->currentIndex < 0) {
                setCurrentIndex(0);
            } else {
                d->moveReason = QDeclarativeGridViewPrivate::SetIndex;
                d->updateCurrent(d->currentIndex);
            }
        }
        connect(d->model, SIGNAL(itemsInserted(int,int)), this, SLOT(itemsInserted(int,int)));
        connect(d->model, SIGNAL(itemsRemoved(int,int)), this, SLOT(itemsRemoved(int,int)));
        connect(d->model, SIGNAL(itemsMoved(int,int,int)), this, SLOT(itemsMoved(int,int,int)));
        connect(d->model, SIGNAL(modelReset()), this, SLOT(modelReset()));
        connect(d->model, SIGNAL(createdItem(int, QDeclarativeItem*)), this, SLOT(createdItem(int,QDeclarativeItem*)));
        connect(d->model, SIGNAL(destroyingItem(QDeclarativeItem*)), this, SLOT(destroyingItem(QDeclarativeItem*)));
        emit countChanged();
    }
    emit modelChanged();
}

/*!
    \qmlproperty component GridView::delegate

    The delegate provides a template defining each item instantiated by the view.
    The index is exposed as an accessible \c index property.  Properties of the
    model are also available depending upon the type of \l {qmlmodels}{Data Model}.

    Note that the GridView will layout the items based on the size of the root item
    in the delegate.

    Here is an example delegate:
    \snippet doc/src/snippets/declarative/gridview/gridview.qml 0
*/
QDeclarativeComponent *QDeclarativeGridView::delegate() const
{
    Q_D(const QDeclarativeGridView);
    if (d->model) {
        if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model))
            return dataModel->delegate();
    }

    return 0;
}

void QDeclarativeGridView::setDelegate(QDeclarativeComponent *delegate)
{
    Q_D(QDeclarativeGridView);
    if (delegate == this->delegate())
        return;

    if (!d->ownModel) {
        d->model = new QDeclarativeVisualDataModel(qmlContext(this));
        d->ownModel = true;
    }
    if (QDeclarativeVisualDataModel *dataModel = qobject_cast<QDeclarativeVisualDataModel*>(d->model)) {
        dataModel->setDelegate(delegate);
        if (isComponentComplete()) {
            refill();
            d->moveReason = QDeclarativeGridViewPrivate::SetIndex;
            d->updateCurrent(d->currentIndex);
        }
        emit delegateChanged();
    }
}

/*!
  \qmlproperty int GridView::currentIndex
  \qmlproperty Item GridView::currentItem

  \c currentIndex holds the index of the current item.
  \c currentItem is the current item.  Note that the position of the current item
  may only be approximate until it becomes visible in the view.
*/
int QDeclarativeGridView::currentIndex() const
{
    Q_D(const QDeclarativeGridView);
    return d->currentIndex;
}

void QDeclarativeGridView::setCurrentIndex(int index)
{
    Q_D(QDeclarativeGridView);
    if (d->requestedIndex >= 0) // currently creating item
        return;
    if (isComponentComplete() && d->isValid() && index != d->currentIndex && index < d->model->count() && index >= 0) {
        d->moveReason = QDeclarativeGridViewPrivate::SetIndex;
        cancelFlick();
        d->updateCurrent(index);
    } else if (index != d->currentIndex) {
        d->currentIndex = index;
        emit currentIndexChanged();
    }
}

QDeclarativeItem *QDeclarativeGridView::currentItem()
{
    Q_D(QDeclarativeGridView);
    if (!d->currentItem)
        return 0;
    return d->currentItem->item;
}

/*!
  \qmlproperty Item GridView::highlightItem

  \c highlightItem holds the highlight item, which was created
  from the \l highlight component.

  The highlightItem is managed by the view unless
  \l highlightFollowsCurrentItem is set to false.

  \sa highlight, highlightFollowsCurrentItem
*/
QDeclarativeItem *QDeclarativeGridView::highlightItem()
{
    Q_D(QDeclarativeGridView);
    if (!d->highlight)
        return 0;
    return d->highlight->item;
}

/*!
  \qmlproperty int GridView::count
  This property holds the number of items in the view.
*/
int QDeclarativeGridView::count() const
{
    Q_D(const QDeclarativeGridView);
    if (d->model)
        return d->model->count();
    return 0;
}

/*!
  \qmlproperty component GridView::highlight
  This property holds the component to use as the highlight.

  An instance of the highlight component will be created for each view.
  The geometry of the resultant component instance will be managed by the view
  so as to stay with the current item, unless the highlightFollowsCurrentItem property is false.

  The below example demonstrates how to make a simple highlight:
  \snippet doc/src/snippets/declarative/gridview/gridview.qml 1

  \sa highlightItem, highlightFollowsCurrentItem
*/
QDeclarativeComponent *QDeclarativeGridView::highlight() const
{
    Q_D(const QDeclarativeGridView);
    return d->highlightComponent;
}

void QDeclarativeGridView::setHighlight(QDeclarativeComponent *highlight)
{
    Q_D(QDeclarativeGridView);
    if (highlight != d->highlightComponent) {
        d->highlightComponent = highlight;
        d->updateCurrent(d->currentIndex);
        emit highlightChanged();
    }
}

/*!
  \qmlproperty bool GridView::highlightFollowsCurrentItem
  This property sets whether the highlight is managed by the view.

  If highlightFollowsCurrentItem is true, the highlight will be moved smoothly
  to follow the current item.  If highlightFollowsCurrentItem is false, the
  highlight will not be moved by the view, and must be implemented
  by the highlight component, for example:

  \code
  Component {
      id: myHighlight
      Rectangle {
          id: wrapper; color: "lightsteelblue"; radius: 4; width: 320; height: 60
          SpringFollow on y { source: Wrapper.GridView.view.currentItem.y; spring: 3; damping: 0.2 }
          SpringFollow on x { source: Wrapper.GridView.view.currentItem.x; spring: 3; damping: 0.2 }
      }
  }
  \endcode
*/
bool QDeclarativeGridView::highlightFollowsCurrentItem() const
{
    Q_D(const QDeclarativeGridView);
    return d->autoHighlight;
}

void QDeclarativeGridView::setHighlightFollowsCurrentItem(bool autoHighlight)
{
    Q_D(QDeclarativeGridView);
    if (d->autoHighlight != autoHighlight) {
        d->autoHighlight = autoHighlight;
        if (d->highlightXAnimator) {
            d->highlightXAnimator->setEnabled(d->autoHighlight);
            d->highlightYAnimator->setEnabled(d->autoHighlight);
        }
        d->updateHighlight();
    }
}

/*!
    \qmlproperty real GridView::preferredHighlightBegin
    \qmlproperty real GridView::preferredHighlightEnd
    \qmlproperty enumeration GridView::highlightRangeMode

    These properties set the preferred range of the highlight (current item)
    within the view.

    Note that this is the correct way to influence where the
    current item ends up when the view scrolls. For example, if you want the
    currently selected item to be in the middle of the list, then set the
    highlight range to be where the middle item would go. Then, when the view scrolls,
    the currently selected item will be the item at that spot. This also applies to
    when the currently selected item changes - it will scroll to within the preferred
    highlight range. Furthermore, the behaviour of the current item index will occur
    whether or not a highlight exists.

    If highlightRangeMode is set to \e ApplyRange the view will
    attempt to maintain the highlight within the range, however
    the highlight can move outside of the range at the ends of the list
    or due to a mouse interaction.

    If highlightRangeMode is set to \e StrictlyEnforceRange the highlight will never
    move outside of the range.  This means that the current item will change
    if a keyboard or mouse action would cause the highlight to move
    outside of the range.

    The default value is \e NoHighlightRange.

    Note that a valid range requires preferredHighlightEnd to be greater
    than or equal to preferredHighlightBegin.
*/
qreal QDeclarativeGridView::preferredHighlightBegin() const
{
    Q_D(const QDeclarativeGridView);
    return d->highlightRangeStart;
}

void QDeclarativeGridView::setPreferredHighlightBegin(qreal start)
{
    Q_D(QDeclarativeGridView);
    if (d->highlightRangeStart == start)
        return;
    d->highlightRangeStart = start;
    d->haveHighlightRange = d->highlightRange != NoHighlightRange && d->highlightRangeStart <= d->highlightRangeEnd;
    emit preferredHighlightBeginChanged();
}

qreal QDeclarativeGridView::preferredHighlightEnd() const
{
    Q_D(const QDeclarativeGridView);
    return d->highlightRangeEnd;
}

void QDeclarativeGridView::setPreferredHighlightEnd(qreal end)
{
    Q_D(QDeclarativeGridView);
    if (d->highlightRangeEnd == end)
        return;
    d->highlightRangeEnd = end;
    d->haveHighlightRange = d->highlightRange != NoHighlightRange && d->highlightRangeStart <= d->highlightRangeEnd;
    emit preferredHighlightEndChanged();
}

QDeclarativeGridView::HighlightRangeMode QDeclarativeGridView::highlightRangeMode() const
{
    Q_D(const QDeclarativeGridView);
    return d->highlightRange;
}

void QDeclarativeGridView::setHighlightRangeMode(HighlightRangeMode mode)
{
    Q_D(QDeclarativeGridView);
    if (d->highlightRange == mode)
        return;
    d->highlightRange = mode;
    d->haveHighlightRange = d->highlightRange != NoHighlightRange && d->highlightRangeStart <= d->highlightRangeEnd;
    emit highlightRangeModeChanged();
}


/*!
  \qmlproperty enumeration GridView::flow
  This property holds the flow of the grid.

  Possible values are \c LeftToRight (default) and \c TopToBottom.

  If \a flow is \c LeftToRight, the view will scroll vertically.
  If \a flow is \c TopToBottom, the view will scroll horizontally.
*/
QDeclarativeGridView::Flow QDeclarativeGridView::flow() const
{
    Q_D(const QDeclarativeGridView);
    return d->flow;
}

void QDeclarativeGridView::setFlow(Flow flow)
{
    Q_D(QDeclarativeGridView);
    if (d->flow != flow) {
        d->flow = flow;
        if (d->flow == LeftToRight) {
            setContentWidth(-1);
            setFlickDirection(QDeclarativeFlickable::VerticalFlick);
        } else {
            setContentHeight(-1);
            setFlickDirection(QDeclarativeFlickable::HorizontalFlick);
        }
        d->clear();
        d->updateGrid();
        refill();
        d->updateCurrent(d->currentIndex);
        emit flowChanged();
    }
}

/*!
  \qmlproperty bool GridView::keyNavigationWraps
  This property holds whether the grid wraps key navigation

  If this property is true then key presses to move off of one end of the grid will cause the
  selection to jump to the other side.
*/
bool QDeclarativeGridView::isWrapEnabled() const
{
    Q_D(const QDeclarativeGridView);
    return d->wrap;
}

void QDeclarativeGridView::setWrapEnabled(bool wrap)
{
    Q_D(QDeclarativeGridView);
    if (d->wrap == wrap)
        return;
    d->wrap = wrap;
    emit keyNavigationWrapsChanged();
}

/*!
  \qmlproperty int GridView::cacheBuffer
  This property holds the number of off-screen pixels to cache.

  This property determines the number of pixels above the top of the view
  and below the bottom of the view to cache.  Setting this value can make
  scrolling the view smoother at the expense of additional memory usage.
*/
int QDeclarativeGridView::cacheBuffer() const
{
    Q_D(const QDeclarativeGridView);
    return d->buffer;
}

void QDeclarativeGridView::setCacheBuffer(int buffer)
{
    Q_D(QDeclarativeGridView);
    if (d->buffer != buffer) {
        d->buffer = buffer;
        if (isComponentComplete())
            refill();
        emit cacheBufferChanged();
    }
}

/*!
  \qmlproperty int GridView::cellWidth
  \qmlproperty int GridView::cellHeight

  These properties holds the width and height of each cell in the grid

  The default cell size is 100x100.
*/
int QDeclarativeGridView::cellWidth() const
{
    Q_D(const QDeclarativeGridView);
    return d->cellWidth;
}

void QDeclarativeGridView::setCellWidth(int cellWidth)
{
    Q_D(QDeclarativeGridView);
    if (cellWidth != d->cellWidth && cellWidth > 0) {
        d->cellWidth = qMax(1, cellWidth);
        d->updateGrid();
        emit cellWidthChanged();
        d->layout();
    }
}

int QDeclarativeGridView::cellHeight() const
{
    Q_D(const QDeclarativeGridView);
    return d->cellHeight;
}

void QDeclarativeGridView::setCellHeight(int cellHeight)
{
    Q_D(QDeclarativeGridView);
    if (cellHeight != d->cellHeight && cellHeight > 0) {
        d->cellHeight = qMax(1, cellHeight);
        d->updateGrid();
        emit cellHeightChanged();
        d->layout();
    }
}
/*!
    \qmlproperty enumeration GridView::snapMode

    This property determines where the view will settle following a drag or flick.
    The allowed values are:

    \list
    \o NoSnap (default) - the view will stop anywhere within the visible area.
    \o SnapToRow - the view will settle with a row (or column for TopToBottom flow)
    aligned with the start of the view.
    \o SnapOneRow - the view will settle no more than one row (or column for TopToBottom flow)
    away from the first visible row at the time the mouse button is released.
    This mode is particularly useful for moving one page at a time.
    \endlist

*/
QDeclarativeGridView::SnapMode QDeclarativeGridView::snapMode() const
{
    Q_D(const QDeclarativeGridView);
    return d->snapMode;
}

void QDeclarativeGridView::setSnapMode(SnapMode mode)
{
    Q_D(QDeclarativeGridView);
    if (d->snapMode != mode) {
        d->snapMode = mode;
        emit snapModeChanged();
    }
}

bool QDeclarativeGridView::event(QEvent *event)
{
    Q_D(QDeclarativeGridView);
    if (event->type() == QEvent::User) {
        d->layout();
        return true;
    }

    return QDeclarativeFlickable::event(event);
}

void QDeclarativeGridView::viewportMoved()
{
    Q_D(QDeclarativeGridView);
    QDeclarativeFlickable::viewportMoved();
    d->lazyRelease = true;
    if (d->flicked) {
        if (yflick()) {
            if (d->vData.velocity > 0)
                d->bufferMode = QDeclarativeGridViewPrivate::BufferBefore;
            else if (d->vData.velocity < 0)
                d->bufferMode = QDeclarativeGridViewPrivate::BufferAfter;
        }

        if (xflick()) {
            if (d->hData.velocity > 0)
                d->bufferMode = QDeclarativeGridViewPrivate::BufferBefore;
            else if (d->hData.velocity < 0)
                d->bufferMode = QDeclarativeGridViewPrivate::BufferAfter;
        }
    }
    refill();
    if (isFlicking() || d->moving)
        d->moveReason = QDeclarativeGridViewPrivate::Mouse;
    if (d->moveReason != QDeclarativeGridViewPrivate::SetIndex) {
        if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange && d->highlight) {
            // reposition highlight
            qreal pos = d->highlight->rowPos();
            qreal viewPos = qRound(d->position());
            if (pos > viewPos + d->highlightRangeEnd - 1 - d->rowSize())
                pos = viewPos + d->highlightRangeEnd - 1 - d->rowSize();
            if (pos < viewPos + d->highlightRangeStart)
                pos = viewPos + d->highlightRangeStart;
            d->highlight->setPosition(d->highlight->colPos(), pos);

            // update current index
            int idx = d->snapIndex();
            if (idx >= 0 && idx != d->currentIndex) {
                d->updateCurrent(idx);
                if (d->currentItem && d->currentItem->colPos() != d->highlight->colPos() && d->autoHighlight) {
                    if (d->flow == LeftToRight)
                        d->highlightXAnimator->setSourceValue(d->currentItem->item->x());
                    else
                        d->highlightYAnimator->setSourceValue(d->currentItem->item->y());
                }
            }
        }
    }
}

qreal QDeclarativeGridView::minYExtent() const
{
    Q_D(const QDeclarativeGridView);
    if (d->flow == QDeclarativeGridView::TopToBottom)
        return QDeclarativeFlickable::minYExtent();
    qreal extent = -d->startPosition();
    if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange)
        extent += d->highlightRangeStart;
    return extent;
}

qreal QDeclarativeGridView::maxYExtent() const
{
    Q_D(const QDeclarativeGridView);
    if (d->flow == QDeclarativeGridView::TopToBottom)
        return QDeclarativeFlickable::maxYExtent();
    qreal extent;
    if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange) {
        extent = -(d->endPosition() - d->highlightRangeEnd);
        extent = qMax(extent, -(d->rowPosAt(d->model->count()-1) - d->highlightRangeStart));
    } else {
        extent = -(d->endPosition() - height());
    }
    const qreal minY = minYExtent();
    if (extent > minY)
        extent = minY;
    return extent;
}

qreal QDeclarativeGridView::minXExtent() const
{
    Q_D(const QDeclarativeGridView);
    if (d->flow == QDeclarativeGridView::LeftToRight)
        return QDeclarativeFlickable::minXExtent();
    qreal extent = -d->startPosition();
    if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange)
        extent += d->highlightRangeStart;
    return extent;
}

qreal QDeclarativeGridView::maxXExtent() const
{
    Q_D(const QDeclarativeGridView);
    if (d->flow == QDeclarativeGridView::LeftToRight)
        return QDeclarativeFlickable::maxXExtent();
    qreal extent;
    if (d->haveHighlightRange && d->highlightRange == StrictlyEnforceRange) {
        extent = -(d->endPosition() - d->highlightRangeEnd);
        extent = qMax(extent, -(d->rowPosAt(d->model->count()-1) - d->highlightRangeStart));
    } else {
        extent = -(d->endPosition() - height());
    }
    const qreal minX = minXExtent();
    if (extent > minX)
        extent = minX;
    return extent;
}

void QDeclarativeGridView::keyPressEvent(QKeyEvent *event)
{
    Q_D(QDeclarativeGridView);
    if (d->model && d->model->count() && d->interactive) {
        d->moveReason = QDeclarativeGridViewPrivate::SetIndex;
        int oldCurrent = currentIndex();
        switch (event->key()) {
        case Qt::Key_Up:
            moveCurrentIndexUp();
            break;
        case Qt::Key_Down:
            moveCurrentIndexDown();
            break;
        case Qt::Key_Left:
            moveCurrentIndexLeft();
            break;
        case Qt::Key_Right:
            moveCurrentIndexRight();
            break;
        default:
            break;
        }
        if (oldCurrent != currentIndex()) {
            event->accept();
            return;
        }
    }
    d->moveReason = QDeclarativeGridViewPrivate::Other;
    QDeclarativeFlickable::keyPressEvent(event);
    if (event->isAccepted())
        return;
    event->ignore();
}

/*!
    \qmlmethod GridView::moveCurrentIndexUp()

    Move the currentIndex up one item in the view.
    The current index will wrap if keyNavigationWraps is true and it
    is currently at the end.
*/
void QDeclarativeGridView::moveCurrentIndexUp()
{
    Q_D(QDeclarativeGridView);
    if (d->flow == QDeclarativeGridView::LeftToRight) {
        if (currentIndex() >= d->columns || d->wrap) {
            int index = currentIndex() - d->columns;
            setCurrentIndex(index >= 0 ? index : d->model->count()-1);
        }
    } else {
        if (currentIndex() > 0 || d->wrap) {
            int index = currentIndex() - 1;
            setCurrentIndex(index >= 0 ? index : d->model->count()-1);
        }
    }
}

/*!
    \qmlmethod GridView::moveCurrentIndexDown()

    Move the currentIndex down one item in the view.
    The current index will wrap if keyNavigationWraps is true and it
    is currently at the end.
*/
void QDeclarativeGridView::moveCurrentIndexDown()
{
    Q_D(QDeclarativeGridView);
    if (d->flow == QDeclarativeGridView::LeftToRight) {
        if (currentIndex() < d->model->count() - d->columns || d->wrap) {
            int index = currentIndex()+d->columns;
            setCurrentIndex(index < d->model->count() ? index : 0);
        }
    } else {
        if (currentIndex() < d->model->count() - 1 || d->wrap) {
            int index = currentIndex() + 1;
            setCurrentIndex(index < d->model->count() ? index : 0);
        }
    }
}

/*!
    \qmlmethod GridView::moveCurrentIndexLeft()

    Move the currentIndex left one item in the view.
    The current index will wrap if keyNavigationWraps is true and it
    is currently at the end.
*/
void QDeclarativeGridView::moveCurrentIndexLeft()
{
    Q_D(QDeclarativeGridView);
    if (d->flow == QDeclarativeGridView::LeftToRight) {
        if (currentIndex() > 0 || d->wrap) {
            int index = currentIndex() - 1;
            setCurrentIndex(index >= 0 ? index : d->model->count()-1);
        }
    } else {
        if (currentIndex() >= d->columns || d->wrap) {
            int index = currentIndex() - d->columns;
            setCurrentIndex(index >= 0 ? index : d->model->count()-1);
        }
    }
}

/*!
    \qmlmethod GridView::moveCurrentIndexRight()

    Move the currentIndex right one item in the view.
    The current index will wrap if keyNavigationWraps is true and it
    is currently at the end.
*/
void QDeclarativeGridView::moveCurrentIndexRight()
{
    Q_D(QDeclarativeGridView);
    if (d->flow == QDeclarativeGridView::LeftToRight) {
        if (currentIndex() < d->model->count() - 1 || d->wrap) {
            int index = currentIndex() + 1;
            setCurrentIndex(index < d->model->count() ? index : 0);
        }
    } else {
        if (currentIndex() < d->model->count() - d->columns || d->wrap) {
            int index = currentIndex()+d->columns;
            setCurrentIndex(index < d->model->count() ? index : 0);
        }
    }
}

/*!
    \qmlmethod GridView::positionViewAtIndex(int index, PositionMode mode)

    Positions the view such that the \a index is at the position specified by
    \a mode:

    \list
    \o Beginning - position item at the top (or left for TopToBottom flow) of the view.
    \o Center- position item in the center of the view.
    \o End - position item at bottom (or right for horizontal orientation) of the view.
    \o Visible - if any part of the item is visible then take no action, otherwise
    bring the item into view.
    \o Contain - ensure the entire item is visible.  If the item is larger than
    the view the item is positioned at the top (or left for TopToBottom flow) of the view.
    \endlist

    If positioning the view at the index would cause empty space to be displayed at
    the beginning or end of the view, the view will be positioned at the boundary.

    It is not recommended to use contentX or contentY to position the view
    at a particular index.  This is unreliable since removing items from the start
    of the view does not cause all other items to be repositioned.
    The correct way to bring an item into view is with positionViewAtIndex.
*/
void QDeclarativeGridView::positionViewAtIndex(int index, int mode)
{
    Q_D(QDeclarativeGridView);
    if (!d->isValid() || index < 0 || index >= d->model->count())
        return;
    if (mode < Beginning || mode > Contain)
        return;

    qreal pos = d->position();
    FxGridItem *item = d->visibleItem(index);
    if (!item) {
        int itemPos = d->rowPosAt(index);
        // save the currently visible items in case any of them end up visible again
        QList<FxGridItem*> oldVisible = d->visibleItems;
        d->visibleItems.clear();
        d->visibleIndex = index - index % d->columns;
        d->setPosition(itemPos);
        // now release the reference to all the old visible items.
        for (int i = 0; i < oldVisible.count(); ++i)
            d->releaseItem(oldVisible.at(i));
        item = d->visibleItem(index);
    }
    if (item) {
        qreal itemPos = item->rowPos();
        switch (mode) {
        case Beginning:
            pos = itemPos;
            break;
        case Center:
            pos = itemPos - (d->size() - d->rowSize())/2;
            break;
        case End:
            pos = itemPos - d->size() + d->rowSize();
            break;
        case Visible:
            if (itemPos > pos + d->size())
                pos = itemPos - d->size() + d->rowSize();
            else if (item->endRowPos() < pos)
                pos = itemPos;
            break;
        case Contain:
            if (item->endRowPos() > pos + d->size())
                pos = itemPos - d->size() + d->rowSize();
            if (itemPos < pos)
                pos = itemPos;
        }
        qreal maxExtent = d->flow == QDeclarativeGridView::LeftToRight ? -maxYExtent() : -maxXExtent();
        pos = qMin(pos, maxExtent);
        qreal minExtent = d->flow == QDeclarativeGridView::LeftToRight ? -minYExtent() : -minXExtent();
        pos = qMax(pos, minExtent);
        d->setPosition(pos);
    }
    d->fixupPosition();
}

/*!
    \qmlmethod int GridView::indexAt(int x, int y)

    Returns the index of the visible item containing the point \a x, \a y in content
    coordinates.  If there is no item at the point specified, or the item is
    not visible -1 is returned.

    If the item is outside the visible area, -1 is returned, regardless of
    whether an item will exist at that point when scrolled into view.
*/
int QDeclarativeGridView::indexAt(int x, int y) const
{
    Q_D(const QDeclarativeGridView);
    for (int i = 0; i < d->visibleItems.count(); ++i) {
        const FxGridItem *listItem = d->visibleItems.at(i);
        if(listItem->contains(x, y))
            return listItem->index;
    }

    return -1;
}

void QDeclarativeGridView::componentComplete()
{
    Q_D(QDeclarativeGridView);
    QDeclarativeFlickable::componentComplete();
    d->updateGrid();
    refill();
    if (d->currentIndex < 0)
        d->updateCurrent(0);
    else
        d->updateCurrent(d->currentIndex);
    d->fixupPosition();
}

void QDeclarativeGridView::trackedPositionChanged()
{
    Q_D(QDeclarativeGridView);
    if (!d->trackedItem || !d->currentItem)
        return;
    if (!isFlicking() && !d->moving && d->moveReason == QDeclarativeGridViewPrivate::SetIndex) {
        const qreal trackedPos = d->trackedItem->rowPos();
        const qreal viewPos = d->position();
        if (d->haveHighlightRange) {
            if (d->highlightRange == StrictlyEnforceRange) {
                qreal pos = viewPos;
                if (trackedPos > pos + d->highlightRangeEnd - d->rowSize())
                    pos = trackedPos - d->highlightRangeEnd + d->rowSize();
                if (trackedPos < pos + d->highlightRangeStart)
                    pos = trackedPos - d->highlightRangeStart;
                d->setPosition(pos);
            } else {
                qreal pos = viewPos;
                if (trackedPos < d->startPosition() + d->highlightRangeStart) {
                    pos = d->startPosition();
                } else if (d->trackedItem->endRowPos() > d->endPosition() - d->size() + d->highlightRangeEnd) {
                    pos = d->endPosition() - d->size();
                    if (pos < d->startPosition())
                        pos = d->startPosition();
                } else {
                    if (trackedPos < viewPos + d->highlightRangeStart) {
                        pos = trackedPos - d->highlightRangeStart;
                    } else if (trackedPos > viewPos + d->highlightRangeEnd - d->rowSize()) {
                        pos = trackedPos - d->highlightRangeEnd + d->rowSize();
                    }
                }
                d->setPosition(pos);
            }
        } else {
            if (trackedPos < viewPos && d->currentItem->rowPos() < viewPos) {
                d->setPosition(d->currentItem->rowPos() < trackedPos ? trackedPos : d->currentItem->rowPos());
            } else if (d->trackedItem->endRowPos() > viewPos + d->size()
                && d->currentItem->endRowPos() > viewPos + d->size()) {
                qreal pos;
                if (d->trackedItem->endRowPos() < d->currentItem->endRowPos()) {
                    pos = d->trackedItem->endRowPos() - d->size();
                    if (d->rowSize() > d->size())
                        pos = trackedPos;
                } else {
                    pos = d->currentItem->endRowPos() - d->size();
                    if (d->rowSize() > d->size())
                        pos = d->currentItem->rowPos();
                }
                d->setPosition(pos);
            }
        }
    }
}

void QDeclarativeGridView::itemsInserted(int modelIndex, int count)
{
    Q_D(QDeclarativeGridView);
    if (!isComponentComplete())
        return;
    if (!d->visibleItems.count() || d->model->count() <= 1) {
        d->scheduleLayout();
        if (d->currentIndex >= modelIndex) {
            // adjust current item index
            d->currentIndex += count;
            if (d->currentItem)
                d->currentItem->index = d->currentIndex;
            emit currentIndexChanged();
        }
        emit countChanged();
        return;
    }

    int index = d->mapFromModel(modelIndex);
    if (index == -1) {
        int i = d->visibleItems.count() - 1;
        while (i > 0 && d->visibleItems.at(i)->index == -1)
            --i;
        if (d->visibleItems.at(i)->index + 1 == modelIndex) {
            // Special case of appending an item to the model.
            index = d->visibleIndex + d->visibleItems.count();
        } else {
            if (modelIndex <= d->visibleIndex) {
                // Insert before visible items
                d->visibleIndex += count;
                for (int i = 0; i < d->visibleItems.count(); ++i) {
                    FxGridItem *listItem = d->visibleItems.at(i);
                    if (listItem->index != -1 && listItem->index >= modelIndex)
                        listItem->index += count;
                }
            }
            if (d->currentIndex >= modelIndex) {
                // adjust current item index
                d->currentIndex += count;
                if (d->currentItem)
                    d->currentItem->index = d->currentIndex;
                emit currentIndexChanged();
            }
            d->scheduleLayout();
            emit countChanged();
            return;
        }
    }

    // At least some of the added items will be visible
    int insertCount = count;
    if (index < d->visibleIndex) {
        insertCount -= d->visibleIndex - index;
        index = d->visibleIndex;
        modelIndex = d->visibleIndex;
    }

    index -= d->visibleIndex;
    int to = d->buffer+d->position()+d->size()-1;
    int colPos, rowPos;
    if (index < d->visibleItems.count()) {
        colPos = d->visibleItems.at(index)->colPos();
        rowPos = d->visibleItems.at(index)->rowPos();
    } else {
        // appending items to visible list
        colPos = d->visibleItems.at(index-1)->colPos() + d->colSize();
        rowPos = d->visibleItems.at(index-1)->rowPos();
        if (colPos > d->colSize() * (d->columns-1)) {
            colPos = 0;
            rowPos += d->rowSize();
        }
    }

    // Update the indexes of the following visible items.
    for (int i = 0; i < d->visibleItems.count(); ++i) {
        FxGridItem *listItem = d->visibleItems.at(i);
        if (listItem->index != -1 && listItem->index >= modelIndex)
            listItem->index += count;
    }

    bool addedVisible = false;
    QList<FxGridItem*> added;
    int i = 0;
    while (i < insertCount && rowPos <= to + d->rowSize()*(d->columns - (colPos/d->colSize()))/qreal(d->columns)) {
        if (!addedVisible) {
            d->scheduleLayout();
            addedVisible = true;
        }
        FxGridItem *item = d->createItem(modelIndex + i);
        d->visibleItems.insert(index, item);
        item->setPosition(colPos, rowPos);
        added.append(item);
        colPos += d->colSize();
        if (colPos > d->colSize() * (d->columns-1)) {
            colPos = 0;
            rowPos += d->rowSize();
        }
        ++index;
        ++i;
    }
    if (i < insertCount) {
        // We didn't insert all our new items, which means anything
        // beyond the current index is not visible - remove it.
        while (d->visibleItems.count() > index) {
            d->releaseItem(d->visibleItems.takeLast());
        }
    }

    // update visibleIndex
    d->visibleIndex = 0;
    for (QList<FxGridItem*>::Iterator it = d->visibleItems.begin(); it != d->visibleItems.end(); ++it) {
        if ((*it)->index != -1) {
            d->visibleIndex = (*it)->index;
            break;
        }
    }

    if (d->currentIndex >= modelIndex) {
        // adjust current item index
        d->currentIndex += count;
        if (d->currentItem) {
            d->currentItem->index = d->currentIndex;
            d->currentItem->setPosition(d->colPosAt(d->currentIndex), d->rowPosAt(d->currentIndex));
        }
        emit currentIndexChanged();
    }

    // everything is in order now - emit add() signal
    for (int j = 0; j < added.count(); ++j)
        added.at(j)->attached->emitAdd();

    emit countChanged();
}

void QDeclarativeGridView::itemsRemoved(int modelIndex, int count)
{
    Q_D(QDeclarativeGridView);
    if (!isComponentComplete())
        return;
    bool currentRemoved = d->currentIndex >= modelIndex && d->currentIndex < modelIndex + count;
    bool removedVisible = false;

    // Remove the items from the visible list, skipping anything already marked for removal
    QList<FxGridItem*>::Iterator it = d->visibleItems.begin();
    while (it != d->visibleItems.end()) {
        FxGridItem *item = *it;
        if (item->index == -1 || item->index < modelIndex) {
            // already removed, or before removed items
            if (item->index < modelIndex && !removedVisible) {
                d->scheduleLayout();
                removedVisible = true;
            }
            ++it;
        } else if (item->index >= modelIndex + count) {
            // after removed items
            item->index -= count;
            ++it;
        } else {
            // removed item
            if (!removedVisible) {
                d->scheduleLayout();
                removedVisible = true;
            }
            item->attached->emitRemove();
            if (item->attached->delayRemove()) {
                item->index = -1;
                connect(item->attached, SIGNAL(delayRemoveChanged()), this, SLOT(destroyRemoved()), Qt::QueuedConnection);
                ++it;
            } else {
                it = d->visibleItems.erase(it);
                d->releaseItem(item);
            }
        }
    }

    // fix current
    if (d->currentIndex >= modelIndex + count) {
        d->currentIndex -= count;
        if (d->currentItem)
            d->currentItem->index -= count;
        emit currentIndexChanged();
    } else if (currentRemoved) {
        // current item has been removed.
        d->releaseItem(d->currentItem);
        d->currentItem = 0;
        d->currentIndex = -1;
        d->updateCurrent(qMin(modelIndex, d->model->count()-1));
    }

    // update visibleIndex
    d->visibleIndex = 0;
    for (it = d->visibleItems.begin(); it != d->visibleItems.end(); ++it) {
        if ((*it)->index != -1) {
            d->visibleIndex = (*it)->index;
            break;
        }
    }

    if (removedVisible && d->visibleItems.isEmpty()) {
        d->timeline.clear();
        d->setPosition(0);
        if (d->model->count() == 0)
            update();
    }

    emit countChanged();
}

void QDeclarativeGridView::destroyRemoved()
{
    Q_D(QDeclarativeGridView);
    for (QList<FxGridItem*>::Iterator it = d->visibleItems.begin();
            it != d->visibleItems.end();) {
        FxGridItem *listItem = *it;
        if (listItem->index == -1 && listItem->attached->delayRemove() == false) {
            d->releaseItem(listItem);
            it = d->visibleItems.erase(it);
        } else {
            ++it;
        }
    }

    // Correct the positioning of the items
    d->layout();
}

void QDeclarativeGridView::itemsMoved(int from, int to, int count)
{
    Q_D(QDeclarativeGridView);
    if (!isComponentComplete())
        return;
    QHash<int,FxGridItem*> moved;

    bool removedBeforeVisible = false;
    FxGridItem *firstItem = d->firstVisibleItem();

    if (from < to && from < d->visibleIndex && to > d->visibleIndex)
        removedBeforeVisible = true;

    QList<FxGridItem*>::Iterator it = d->visibleItems.begin();
    while (it != d->visibleItems.end()) {
        FxGridItem *item = *it;
        if (item->index >= from && item->index < from + count) {
            // take the items that are moving
            item->index += (to-from);
            moved.insert(item->index, item);
            it = d->visibleItems.erase(it);
            if (item->rowPos() < firstItem->rowPos())
                removedBeforeVisible = true;
        } else {
            if (item->index > from && item->index != -1) {
                // move everything after the moved items.
                item->index -= count;
                if (item->index < d->visibleIndex)
                    d->visibleIndex = item->index;
            } else if (item->index != -1) {
                removedBeforeVisible = true;
            }
            ++it;
        }
    }

    int remaining = count;
    int endIndex = d->visibleIndex;
    it = d->visibleItems.begin();
    while (it != d->visibleItems.end()) {
        FxGridItem *item = *it;
        if (remaining && item->index >= to && item->index < to + count) {
            // place items in the target position, reusing any existing items
            FxGridItem *movedItem = moved.take(item->index);
            if (!movedItem)
                movedItem = d->createItem(item->index);
            it = d->visibleItems.insert(it, movedItem);
            ++it;
            --remaining;
        } else {
            if (item->index != -1) {
                if (item->index >= to) {
                    // update everything after the moved items.
                    item->index += count;
                }
                endIndex = item->index;
            }
            ++it;
        }
    }

    // If we have moved items to the end of the visible items
    // then add any existing moved items that we have
    while (FxGridItem *item = moved.take(endIndex+1)) {
        d->visibleItems.append(item);
        ++endIndex;
    }

    // update visibleIndex
    for (it = d->visibleItems.begin(); it != d->visibleItems.end(); ++it) {
        if ((*it)->index != -1) {
            d->visibleIndex = (*it)->index;
            break;
        }
    }

    // Fix current index
    if (d->currentIndex >= 0 && d->currentItem) {
        int oldCurrent = d->currentIndex;
        d->currentIndex = d->model->indexOf(d->currentItem->item, this);
        if (oldCurrent != d->currentIndex) {
            d->currentItem->index = d->currentIndex;
            emit currentIndexChanged();
        }
    }

    // Whatever moved items remain are no longer visible items.
    while (moved.count()) {
        int idx = moved.begin().key();
        FxGridItem *item = moved.take(idx);
        if (item->item == d->currentItem->item)
            item->setPosition(d->colPosAt(idx), d->rowPosAt(idx));
        d->releaseItem(item);
    }

    d->layout();
}

void QDeclarativeGridView::modelReset()
{
    Q_D(QDeclarativeGridView);
    d->clear();
    refill();
    d->moveReason = QDeclarativeGridViewPrivate::SetIndex;
    d->updateCurrent(d->currentIndex);
    emit countChanged();
}

void QDeclarativeGridView::createdItem(int index, QDeclarativeItem *item)
{
    Q_D(QDeclarativeGridView);
    if (d->requestedIndex != index) {
        item->setParentItem(this);
        d->unrequestedItems.insert(item, index);
        if (d->flow == QDeclarativeGridView::LeftToRight) {
            item->setPos(QPointF(d->colPosAt(index), d->rowPosAt(index)));
        } else {
            item->setPos(QPointF(d->rowPosAt(index), d->colPosAt(index)));
        }
    }
}

void QDeclarativeGridView::destroyingItem(QDeclarativeItem *item)
{
    Q_D(QDeclarativeGridView);
    d->unrequestedItems.remove(item);
}


void QDeclarativeGridView::refill()
{
    Q_D(QDeclarativeGridView);
    d->refill(d->position(), d->position()+d->size()-1);
}


QDeclarativeGridViewAttached *QDeclarativeGridView::qmlAttachedProperties(QObject *obj)
{
    return new QDeclarativeGridViewAttached(obj);
}

QT_END_NAMESPACE