Long live Qt!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtSvg module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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 multimedia
+
+    \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