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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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** This file is part of the QtSvg module of the Qt Toolkit.

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****************************************************************************/

#include "qgraphicssvgitem.h"

#ifndef QT_NO_GRAPHICSSVGITEM

#include "qpainter.h"

#include "qstyleoption.h"

#include "qsvgrenderer.h"

#include "qdebug.h"

#include "private/qobject_p.h"

#include "private/qgraphicsitem_p.h"

QT_BEGIN_NAMESPACE

class QGraphicsSvgItemPrivate : public QGraphicsItemPrivate

{

public:

    Q_DECLARE_PUBLIC(QGraphicsSvgItem)

    QGraphicsSvgItemPrivate()

        : renderer(0), shared(false)

    {

    }

    void init(QGraphicsItem *parent)

    {

        Q_Q(QGraphicsSvgItem);

        q->setParentItem(parent);

        renderer = new QSvgRenderer(q);

        QObject::connect(renderer, SIGNAL(repaintNeeded()),

                         q, SLOT(_q_repaintItem()));

        q->setCacheMode(QGraphicsItem::DeviceCoordinateCache);

        q->setMaximumCacheSize(QSize(1024, 768));

    }

    void _q_repaintItem()

    {

        q_func()->update();

    }

    inline void updateDefaultSize()

    {

        QRectF bounds;

        if (elemId.isEmpty()) {

            bounds = QRectF(QPointF(0, 0), renderer->defaultSize());

        } else {

            bounds = renderer->boundsOnElement(elemId);

        }

        if (boundingRect.size() != bounds.size()) {

            q_func()->prepareGeometryChange();

            boundingRect.setSize(bounds.size());

        }

    }

    QSvgRenderer *renderer;

    QRectF boundingRect;

    bool shared;

    QString elemId;

};

/*!

    \class QGraphicsSvgItem

    \ingroup graphicsview-api

    \brief The QGraphicsSvgItem class is a QGraphicsItem that can be used to render

           the contents of SVG files.

    \since 4.2

    QGraphicsSvgItem provides a way of rendering SVG files onto QGraphicsView.

    QGraphicsSvgItem can be created by passing the SVG file to be rendered to

    its constructor or by explicit setting a shared QSvgRenderer on it.

    Note that setting QSvgRenderer on a QGraphicsSvgItem doesn't make the item take

    ownership of the renderer, therefore if using setSharedRenderer() method one has

    to make sure that the lifetime of the QSvgRenderer object will be at least as long

    as that of the QGraphicsSvgItem.

    QGraphicsSvgItem provides a way of rendering only parts of the SVG files via

    the setElementId. If setElementId() method is called, only the SVG element

    (and its children) with the passed id will be renderer. This provides a convenient

    way of selectively rendering large SVG files that contain a number of discrete

    elements. For example the following code renders only jokers from a SVG file

    containing a whole card deck:

    \snippet doc/src/snippets/code/src_svg_qgraphicssvgitem.cpp 0

    Size of the item can be set via the setSize() method or via

    direct manipulation of the items transformation matrix.

    By default the SVG rendering is cached using QGraphicsItem::DeviceCoordinateCache

    mode to speedup the display of items. Caching can be disabled by passing

    QGraphicsItem::NoCache to the QGraphicsItem::setCacheMode() method.

    \sa QSvgWidget, {QtSvg Module}, QGraphicsItem, QGraphicsView

*/

/*!

    Constructs a new SVG item with the given \a parent.

*/

QGraphicsSvgItem::QGraphicsSvgItem(QGraphicsItem *parent)

    : QGraphicsObject(*new QGraphicsSvgItemPrivate(), 0, 0)

{

    Q_D(QGraphicsSvgItem);

    d->init(parent);

}

/*!

    Constructs a new item with the given \a parent and loads the contents of the

    SVG file with the specified \a fileName.

*/

QGraphicsSvgItem::QGraphicsSvgItem(const QString &fileName, QGraphicsItem *parent)

    : QGraphicsObject(*new QGraphicsSvgItemPrivate(), 0, 0)

{

    Q_D(QGraphicsSvgItem);

    d->init(parent);

    d->renderer->load(fileName);

    d->updateDefaultSize();

}

/*!

    Returns the currently use QSvgRenderer.

*/

QSvgRenderer *QGraphicsSvgItem::renderer() const

{

    return d_func()->renderer;

}

/*!

    Returns the bounding rectangle of this item.

*/

QRectF QGraphicsSvgItem::boundingRect() const

{

    Q_D(const QGraphicsSvgItem);

    return d->boundingRect;

}

/*!

    \internal

    Highlights \a item as selected.

    NOTE: This function is a duplicate of qt_graphicsItem_highlightSelected() in qgraphicsitem.cpp!

*/

static void qt_graphicsItem_highlightSelected(

    QGraphicsItem *item, QPainter *painter, const QStyleOptionGraphicsItem *option)

{

    const QRectF murect = painter->transform().mapRect(QRectF(0, 0, 1, 1));

    if (qFuzzyIsNull(qMax(murect.width(), murect.height())))

        return;

    const QRectF mbrect = painter->transform().mapRect(item->boundingRect());

    if (qMin(mbrect.width(), mbrect.height()) < qreal(1.0))

        return;

    qreal itemPenWidth;

    switch (item->type()) {

        case QGraphicsEllipseItem::Type:

            itemPenWidth = static_cast<QGraphicsEllipseItem *>(item)->pen().widthF();

            break;

        case QGraphicsPathItem::Type:

            itemPenWidth = static_cast<QGraphicsPathItem *>(item)->pen().widthF();

            break;

        case QGraphicsPolygonItem::Type:

            itemPenWidth = static_cast<QGraphicsPolygonItem *>(item)->pen().widthF();

            break;

        case QGraphicsRectItem::Type:

            itemPenWidth = static_cast<QGraphicsRectItem *>(item)->pen().widthF();

            break;

        case QGraphicsSimpleTextItem::Type:

            itemPenWidth = static_cast<QGraphicsSimpleTextItem *>(item)->pen().widthF();

            break;

        case QGraphicsLineItem::Type:

            itemPenWidth = static_cast<QGraphicsLineItem *>(item)->pen().widthF();

            break;

        default:

            itemPenWidth = 1.0;

    }

    const qreal pad = itemPenWidth / 2;

    const qreal penWidth = 0; // cosmetic pen

    const QColor fgcolor = option->palette.windowText().color();

    const QColor bgcolor( // ensure good contrast against fgcolor

        fgcolor.red()   > 127 ? 0 : 255,

        fgcolor.green() > 127 ? 0 : 255,

        fgcolor.blue()  > 127 ? 0 : 255);

    painter->setPen(QPen(bgcolor, penWidth, Qt::SolidLine));

    painter->setBrush(Qt::NoBrush);

    painter->drawRect(item->boundingRect().adjusted(pad, pad, -pad, -pad));

    painter->setPen(QPen(option->palette.windowText(), 0, Qt::DashLine));

    painter->setBrush(Qt::NoBrush);

    painter->drawRect(item->boundingRect().adjusted(pad, pad, -pad, -pad));

}

/*!

    \reimp

*/

void QGraphicsSvgItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option,

                             QWidget *widget)

{

//    Q_UNUSED(option);

    Q_UNUSED(widget);

    Q_D(QGraphicsSvgItem);

    if (!d->renderer->isValid())

        return;

    if (d->elemId.isEmpty())

        d->renderer->render(painter, d->boundingRect);

    else

        d->renderer->render(painter, d->elemId, d->boundingRect);

    if (option->state & QStyle::State_Selected)

        qt_graphicsItem_highlightSelected(this, painter, option);

}

/*!

    \reimp

*/

int QGraphicsSvgItem::type() const

{

    return Type;

}

/*!

  \property QGraphicsSvgItem::maximumCacheSize

  This property holds the maximum size of the device coordinate cache

  for this item.

 */

/*!

    Sets the maximum device coordinate cache size of the item to \a size.

    If the item is cached using QGraphicsItem::DeviceCoordinateCache mode,

    caching is bypassed if the extension of the item in device coordinates

    is larger than \a size.

    The cache corresponds to the QPixmap which is used to cache the

    results of the rendering.

    Use QPixmapCache::setCacheLimit() to set limitations on the whole cache

    and use setMaximumCacheSize() when setting cache size for individual

    items.

    \sa QGraphicsItem::cacheMode()

*/

void QGraphicsSvgItem::setMaximumCacheSize(const QSize &size)

{

    QGraphicsItem::d_ptr->setExtra(QGraphicsItemPrivate::ExtraMaxDeviceCoordCacheSize, size);

    update();

}

/*!

    Returns the current maximum size of the device coordinate cache for this item.

    If the item is cached using QGraphicsItem::DeviceCoordinateCache mode,

    caching is bypassed if the extension of the item in device coordinates

    is larger than the maximum size.

    The default maximum cache size is 1024x768.

    QPixmapCache::cacheLimit() gives the

    cumulative bounds of the whole cache, whereas maximumCacheSize() refers

    to a maximum cache size for this particular item.

    \sa QGraphicsItem::cacheMode()

*/

QSize QGraphicsSvgItem::maximumCacheSize() const

{

    return QGraphicsItem::d_ptr->extra(QGraphicsItemPrivate::ExtraMaxDeviceCoordCacheSize).toSize();

}

/*!

  \property QGraphicsSvgItem::elementId

  This property holds the element's XML ID.

 */

/*!

    Sets the XML ID of the element to \a id.

*/

void QGraphicsSvgItem::setElementId(const QString &id)

{

    Q_D(QGraphicsSvgItem);

    d->elemId = id;

    d->updateDefaultSize();

    update();

}

/*!

    Returns the XML ID the element that is currently

    being rendered. Returns an empty string if the whole

    file is being rendered.

*/

QString QGraphicsSvgItem::elementId() const

{

    Q_D(const QGraphicsSvgItem);

    return d->elemId;

}

/*!

    Sets \a renderer to be a shared QSvgRenderer on the item. By

    using this method one can share the same QSvgRenderer on a number

    of items. This means that the SVG file will be parsed only once.

    QSvgRenderer passed to this method has to exist for as long as

    this item is used.

*/

void QGraphicsSvgItem::setSharedRenderer(QSvgRenderer *renderer)

{

    Q_D(QGraphicsSvgItem);

    if (!d->shared)

        delete d->renderer;

    d->renderer = renderer;

    d->shared = true;

    d->updateDefaultSize();

    update();

}

/*!

    \obsolete

    Use QGraphicsItem::setCacheMode() instead. Passing true to this function is equivalent

    to QGraphicsItem::setCacheMode(QGraphicsItem::DeviceCoordinateCache).

*/

void QGraphicsSvgItem::setCachingEnabled(bool caching)

{

    setCacheMode(caching ? QGraphicsItem::DeviceCoordinateCache : QGraphicsItem::NoCache);

}

/*!

    \obsolete

    Use QGraphicsItem::cacheMode() instead.

*/

bool QGraphicsSvgItem::isCachingEnabled() const

{

    return cacheMode() != QGraphicsItem::NoCache;

}

QT_END_NAMESPACE

#include "moc_qgraphicssvgitem.cpp"

#endif // QT_NO_GRAPHICSSVGITEM