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

#include "qsvgrenderer.h"

#ifndef QT_NO_SVGRENDERER

#include "qsvgtinydocument_p.h"

#include "qbytearray.h"

#include "qtimer.h"

#include "qdebug.h"

#include "private/qobject_p.h"

QT_BEGIN_NAMESPACE

/*!

    \class QSvgRenderer

    \ingroup painting

    \brief The QSvgRenderer class is used to draw the contents of SVG files onto paint devices.

    \since 4.1

    \reentrant

    Using QSvgRenderer, Scalable Vector Graphics (SVG) can be rendered onto any QPaintDevice

    subclass, including QWidget, QImage, and QGLWidget.

    QSvgRenderer provides an API that supports basic features of SVG rendering, such as loading

    and rendering of static drawings, and more interactive features like animation. Since the

    rendering is performed using QPainter, SVG drawings can be rendered on any subclass of

    QPaintDevice.

    SVG drawings are either loaded when an QSvgRenderer is constructed, or loaded later

    using the load() functions. Data is either supplied directly as serialized XML, or

    indirectly using a file name. If a valid file has been loaded, either when the renderer

    is constructed or at some later time, isValid() returns true; otherwise it returns false.

    QSvgRenderer provides the render() slot to render the current document, or the current

    frame of an animated document, using a given painter.

    The defaultSize() function provides information about the amount of space that is required

    to render the currently loaded SVG file. This is useful for paint devices, such as QWidget,

    that often need to supply a size hint to their parent layout.

    The default size of a drawing may differ from its visible area, found using the \l viewBox

    property.

    Animated SVG drawings are supported, and can be controlled with a simple collection of

    functions and properties:

    \list

    \o The animated() function indicates whether a drawing contains animation information.

    \omit

    \o The animationDuration() function provides the duration in milliseconds of the

       animation, without taking any looping into account.

    \o The \l currentFrame property contains the current frame of the animation.

    \endomit

    \o The \l framesPerSecond property contains the rate at which the animation plays.

    \endlist

    Finally, the QSvgRenderer class provides the repaintNeeded() signal which is emitted

    whenever the rendering of the document needs to be updated.

    \sa QSvgWidget, {QtSvg Module}, {SVG Viewer Example}, QPicture

*/

class QSvgRendererPrivate : public QObjectPrivate

{

    Q_DECLARE_PUBLIC(QSvgRenderer)

public:

    explicit QSvgRendererPrivate()

        : QObjectPrivate(),

          render(0), timer(0),

          fps(30)

    {}

    ~QSvgRendererPrivate()

    {

        delete render;

    }

    static void callRepaintNeeded(QSvgRenderer *const q);

    QSvgTinyDocument *render;

    QTimer *timer;

    int fps;

};

/*!

    Constructs a new renderer with the given \a parent.

*/

QSvgRenderer::QSvgRenderer(QObject *parent)

    : QObject(*(new QSvgRendererPrivate), parent)

{

}

/*!

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

    SVG file with the specified \a filename.

*/

QSvgRenderer::QSvgRenderer(const QString &filename, QObject *parent)

    : QObject(*new QSvgRendererPrivate, parent)

{

    load(filename);

}

/*!

    Constructs a new renderer with the given \a parent and loads the SVG data

    from the byte array specified by \a contents.

*/

QSvgRenderer::QSvgRenderer(const QByteArray &contents, QObject *parent)

    : QObject(*new QSvgRendererPrivate, parent)

{

    load(contents);

}

/*!

    \since 4.5

    Constructs a new renderer with the given \a parent and loads the SVG data

    using the stream reader specified by \a contents.

*/

QSvgRenderer::QSvgRenderer(QXmlStreamReader *contents, QObject *parent)

    : QObject(*new QSvgRendererPrivate, parent)

{

    load(contents);

}

/*!

    Destroys the renderer.

*/

QSvgRenderer::~QSvgRenderer()

{

}

/*!

    Returns true if there is a valid current document; otherwise returns false.

*/

bool QSvgRenderer::isValid() const

{

    Q_D(const QSvgRenderer);

    return d->render;

}

/*!

    Returns the default size of the document contents.

*/

QSize QSvgRenderer::defaultSize() const

{

    Q_D(const QSvgRenderer);

    if (d->render)

        return d->render->size();

    else

        return QSize();

}

/*!

    Returns viewBoxF().toRect().

    \sa viewBoxF()

*/

QRect QSvgRenderer::viewBox() const

{

    Q_D(const QSvgRenderer);

    if (d->render)

        return d->render->viewBox().toRect();

    else

        return QRect();

}

/*!

    \property QSvgRenderer::viewBox

    \brief the rectangle specifying the visible area of the document in logical coordinates

    \since 4.2

*/

void QSvgRenderer::setViewBox(const QRect &viewbox)

{

    Q_D(QSvgRenderer);

    if (d->render)

        d->render->setViewBox(viewbox);

}

/*!

    Returns true if the current document contains animated elements; otherwise

    returns false.

    \sa framesPerSecond()

*/

bool QSvgRenderer::animated() const

{

    Q_D(const QSvgRenderer);

    if (d->render)

        return d->render->animated();

    else

        return false;

}

/*!

    \property QSvgRenderer::framesPerSecond

    \brief the number of frames per second to be shown

    The number of frames per second is 0 if the current document is not animated.

    \sa animated()

*/

int QSvgRenderer::framesPerSecond() const

{

    Q_D(const QSvgRenderer);

    return d->fps;

}

void QSvgRenderer::setFramesPerSecond(int num)

{

    Q_D(QSvgRenderer);

    if (num < 0) {

        qWarning("QSvgRenderer::setFramesPerSecond: Cannot set negative value %d", num);

        return;

    }

    d->fps = num;

}

/*!

  \property QSvgRenderer::currentFrame

  \brief the current frame of the document's animation, or 0 if the document is not animated

  \internal

  \sa animationDuration(), framesPerSecond, animated()

*/

/*!

  \internal

*/

int QSvgRenderer::currentFrame() const

{

    Q_D(const QSvgRenderer);

    return d->render->currentFrame();

}

/*!

  \internal

*/

void QSvgRenderer::setCurrentFrame(int frame)

{

    Q_D(QSvgRenderer);

    d->render->setCurrentFrame(frame);

}

/*!

    \internal

    Returns the number of frames in the animation, or 0 if the current document is not

    animated.

    \sa animated(), framesPerSecond

*/

int QSvgRenderer::animationDuration() const

{

    Q_D(const QSvgRenderer);

    return d->render->animationDuration();

}

/*!

 \internal

 \since 4.5

 We can't have template functions, that's loadDocument(), as friends, for this

 code, so we let this function be a friend of QSvgRenderer instead.

 */

void QSvgRendererPrivate::callRepaintNeeded(QSvgRenderer *const q)

{

    q->repaintNeeded();

}

template<typename TInputType>

static bool loadDocument(QSvgRenderer *const q,

                         QSvgRendererPrivate *const d,

                         const TInputType &in)

{

    delete d->render;

    d->render = QSvgTinyDocument::load(in);

    if (d->render && d->render->animated() && d->fps > 0) {

        if (!d->timer)

            d->timer = new QTimer(q);

        else

            d->timer->stop();

        q->connect(d->timer, SIGNAL(timeout()),

                   q, SIGNAL(repaintNeeded()));

        d->timer->start(1000/d->fps);

    } else if (d->timer) {

        d->timer->stop();

    }

    //force first update

    QSvgRendererPrivate::callRepaintNeeded(q);

    return d->render;

}

/*!

    Loads the SVG file specified by \a filename, returning true if the content

    was successfully parsed; otherwise returns false.

*/

bool QSvgRenderer::load(const QString &filename)

{

    Q_D(QSvgRenderer);

    return loadDocument(this, d, filename);

}

/*!

    Loads the specified SVG format \a contents, returning true if the content

    was successfully parsed; otherwise returns false.

*/

bool QSvgRenderer::load(const QByteArray &contents)

{

    Q_D(QSvgRenderer);

    return loadDocument(this, d, contents);

}

/*!

  Loads the specified SVG in \a contents, returning true if the content

  was successfully parsed; otherwise returns false.

  The reader will be used from where it currently is positioned. If \a contents

  is \c null, behavior is undefined.

  \since 4.5

*/

bool QSvgRenderer::load(QXmlStreamReader *contents)

{

    Q_D(QSvgRenderer);

    return loadDocument(this, d, contents);

}

/*!

    Renders the current document, or the current frame of an animated

    document, using the given \a painter.

*/

void QSvgRenderer::render(QPainter *painter)

{

    Q_D(QSvgRenderer);

    if (d->render) {

        d->render->draw(painter);

    }

}

/*!

    \fn void QSvgRenderer::repaintNeeded()

    This signal is emitted whenever the rendering of the document

    needs to be updated, usually for the purposes of animation.

*/

/*!

    Renders the given element with \a elementId using the given \a painter

    on the specified \a bounds. If the bounding rectangle is not specified

    the SVG element is mapped to the whole paint device.

*/

void QSvgRenderer::render(QPainter *painter, const QString &elementId,

                          const QRectF &bounds)

{

    Q_D(QSvgRenderer);

    if (d->render) {

        d->render->draw(painter, elementId, bounds);

    }

}

/*!

    Renders the current document, or the current frame of an animated

    document, using the given \a painter on the specified \a bounds within

    the painter.  If the bounding rectangle is not specified

    the SVG file is mapped to the whole paint device.

*/

void QSvgRenderer::render(QPainter *painter, const QRectF &bounds)

{

    Q_D(QSvgRenderer);

    if (d->render) {

        d->render->draw(painter, bounds);

    }

}

QRectF QSvgRenderer::viewBoxF() const

{

    Q_D(const QSvgRenderer);

    if (d->render)

        return d->render->viewBox();

    else

        return QRect();

}

void QSvgRenderer::setViewBox(const QRectF &viewbox)

{

    Q_D(QSvgRenderer);

    if (d->render)

        d->render->setViewBox(viewbox);

}

/*!

    \since 4.2

    Returns bounding rectangle of the item with the given \a id.

    The transformation matrix of parent elements is not affecting

    the bounds of the element.

    \sa matrixForElement()

*/

QRectF QSvgRenderer::boundsOnElement(const QString &id) const

{

    Q_D(const QSvgRenderer);

    QRectF bounds;

    if (d->render)

        bounds = d->render->boundsOnElement(id);

    return bounds;

}

/*!

    \since 4.2

    Returns true if the element with the given \a id exists

    in the currently parsed SVG file and is a renderable

    element.

    Note: this method returns true only for elements that

    can be rendered. Which implies that elements that are considered

    part of the fill/stroke style properties, e.g. radialGradients

    even tough marked with "id" attributes will not be found by this

    method.

*/

bool QSvgRenderer::elementExists(const QString &id) const

{

    Q_D(const QSvgRenderer);

    bool exists = false;

    if (d->render)

        exists = d->render->elementExists(id);

    return exists;

}

/*!

    \since 4.2

    Returns the transformation matrix for the element

    with the given \a id. The matrix is a product of

    the transformation of the element's parents. The transformation of

    the element itself is not included.

    To find the bounding rectangle of the element in logical coordinates,

    you can apply the matrix on the rectangle returned from boundsOnElement().

    \sa boundsOnElement()

*/

QMatrix QSvgRenderer::matrixForElement(const QString &id) const

{

    Q_D(const QSvgRenderer);

    QMatrix mat;

    if (d->render)

        mat = d->render->matrixForElement(id);

    return mat;

}

QT_END_NAMESPACE

#include "moc_qsvgrenderer.cpp"

#endif // QT_NO_SVGRENDERER