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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the examples of the Qt Toolkit.

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

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    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

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    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 #include "svgview.h"

    42 

    43 #include <QFile>

    44 #include <QWheelEvent>

    45 #include <QMouseEvent>

    46 #include <QGraphicsRectItem>

    47 #include <QGraphicsSvgItem>

    48 #include <QPaintEvent>

    49 #include <qmath.h>

    50 

    51 #ifndef QT_NO_OPENGL

    52 #include <QGLWidget>

    53 #endif

    54 

    55 SvgView::SvgView(QWidget *parent)

    56     : QGraphicsView(parent)

    57     , m_renderer(Native)

    58     , m_svgItem(0)

    59     , m_backgroundItem(0)

    60     , m_outlineItem(0)

    61 {

    62     setScene(new QGraphicsScene(this));

    63     setTransformationAnchor(AnchorUnderMouse);

    64     setDragMode(ScrollHandDrag);

    65     setViewportUpdateMode(FullViewportUpdate);

    66 

    67     // Prepare background check-board pattern

    68     QPixmap tilePixmap(64, 64);

    69     tilePixmap.fill(Qt::white);

    70     QPainter tilePainter(&tilePixmap);

    71     QColor color(220, 220, 220);

    72     tilePainter.fillRect(0, 0, 32, 32, color);

    73     tilePainter.fillRect(32, 32, 32, 32, color);

    74     tilePainter.end();

    75 

    76     setBackgroundBrush(tilePixmap);

    77 }

    78 

    79 void SvgView::drawBackground(QPainter *p, const QRectF &)

    80 {

    81     p->save();

    82     p->resetTransform();

    83     p->drawTiledPixmap(viewport()->rect(), backgroundBrush().texture());

    84     p->restore();

    85 }

    86 

    87 void SvgView::openFile(const QFile &file)

    88 {

    89     if (!file.exists())

    90         return;

    91 

    92     QGraphicsScene *s = scene();

    93 

    94     bool drawBackground = (m_backgroundItem ? m_backgroundItem->isVisible() : false);

    95     bool drawOutline = (m_outlineItem ? m_outlineItem->isVisible() : true);

    96 

    97     s->clear();

    98     resetTransform();

    99 

   100     m_svgItem = new QGraphicsSvgItem(file.fileName());

   101     m_svgItem->setFlags(QGraphicsItem::ItemClipsToShape);

   102     m_svgItem->setCacheMode(QGraphicsItem::NoCache);

   103     m_svgItem->setZValue(0);

   104 

   105     m_backgroundItem = new QGraphicsRectItem(m_svgItem->boundingRect());

   106     m_backgroundItem->setBrush(Qt::white);

   107     m_backgroundItem->setPen(Qt::NoPen);

   108     m_backgroundItem->setVisible(drawBackground);

   109     m_backgroundItem->setZValue(-1);

   110 

   111     m_outlineItem = new QGraphicsRectItem(m_svgItem->boundingRect());

   112     QPen outline(Qt::black, 2, Qt::DashLine);

   113     outline.setCosmetic(true);

   114     m_outlineItem->setPen(outline);

   115     m_outlineItem->setBrush(Qt::NoBrush);

   116     m_outlineItem->setVisible(drawOutline);

   117     m_outlineItem->setZValue(1);

   118 

   119     s->addItem(m_backgroundItem);

   120     s->addItem(m_svgItem);

   121     s->addItem(m_outlineItem);

   122 

   123     s->setSceneRect(m_outlineItem->boundingRect().adjusted(-10, -10, 10, 10));

   124 }

   125 

   126 void SvgView::setRenderer(RendererType type)

   127 {

   128     m_renderer = type;

   129 

   130     if (m_renderer == OpenGL) {

   131 #ifndef QT_NO_OPENGL

   132         setViewport(new QGLWidget(QGLFormat(QGL::SampleBuffers)));

   133 #endif

   134     } else {

   135         setViewport(new QWidget);

   136     }

   137 }

   138 

   139 void SvgView::setHighQualityAntialiasing(bool highQualityAntialiasing)

   140 {

   141 #ifndef QT_NO_OPENGL

   142     setRenderHint(QPainter::HighQualityAntialiasing, highQualityAntialiasing);

   143 #else

   144     Q_UNUSED(highQualityAntialiasing);

   145 #endif

   146 }

   147 

   148 void SvgView::setViewBackground(bool enable)

   149 {

   150     if (!m_backgroundItem)

   151           return;

   152 

   153     m_backgroundItem->setVisible(enable);

   154 }

   155 

   156 void SvgView::setViewOutline(bool enable)

   157 {

   158     if (!m_outlineItem)

   159         return;

   160 

   161     m_outlineItem->setVisible(enable);

   162 }

   163 

   164 void SvgView::paintEvent(QPaintEvent *event)

   165 {

   166     if (m_renderer == Image) {

   167         if (m_image.size() != viewport()->size()) {

   168             m_image = QImage(viewport()->size(), QImage::Format_ARGB32_Premultiplied);

   169         }

   170 

   171         QPainter imagePainter(&m_image);

   172         QGraphicsView::render(&imagePainter);

   173         imagePainter.end();

   174 

   175         QPainter p(viewport());

   176         p.drawImage(0, 0, m_image);

   177 

   178     } else {

   179         QGraphicsView::paintEvent(event);

   180     }

   181 }

   182 

   183 void SvgView::wheelEvent(QWheelEvent *event)

   184 {

   185     qreal factor = qPow(1.2, event->delta() / 240.0);

   186     scale(factor, factor);

   187     event->accept();

   188 }

   189