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#include "svgview.h"

#include <QFile>

#include <QWheelEvent>

#include <QMouseEvent>

#include <QGraphicsRectItem>

#include <QGraphicsSvgItem>

#include <QPaintEvent>

#include <qmath.h>

#ifndef QT_NO_OPENGL

#include <QGLWidget>

#endif

SvgView::SvgView(QWidget *parent)

    : QGraphicsView(parent)

    , m_renderer(Native)

    , m_svgItem(0)

    , m_backgroundItem(0)

    , m_outlineItem(0)

{

    setScene(new QGraphicsScene(this));

    setTransformationAnchor(AnchorUnderMouse);

    setDragMode(ScrollHandDrag);

    setViewportUpdateMode(FullViewportUpdate);

    // Prepare background check-board pattern

    QPixmap tilePixmap(64, 64);

    tilePixmap.fill(Qt::white);

    QPainter tilePainter(&tilePixmap);

    QColor color(220, 220, 220);

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

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

    tilePainter.end();

    setBackgroundBrush(tilePixmap);

}

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

{

    p->save();

    p->resetTransform();

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

    p->restore();

}

void SvgView::openFile(const QFile &file)

{

    if (!file.exists())

        return;

    QGraphicsScene *s = scene();

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

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

    s->clear();

    resetTransform();

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

    m_svgItem->setFlags(QGraphicsItem::ItemClipsToShape);

    m_svgItem->setCacheMode(QGraphicsItem::NoCache);

    m_svgItem->setZValue(0);

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

    m_backgroundItem->setBrush(Qt::white);

    m_backgroundItem->setPen(Qt::NoPen);

    m_backgroundItem->setVisible(drawBackground);

    m_backgroundItem->setZValue(-1);

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

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

    outline.setCosmetic(true);

    m_outlineItem->setPen(outline);

    m_outlineItem->setBrush(Qt::NoBrush);

    m_outlineItem->setVisible(drawOutline);

    m_outlineItem->setZValue(1);

    s->addItem(m_backgroundItem);

    s->addItem(m_svgItem);

    s->addItem(m_outlineItem);

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

}

void SvgView::setRenderer(RendererType type)

{

    m_renderer = type;

    if (m_renderer == OpenGL) {

#ifndef QT_NO_OPENGL

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

#endif

    } else {

        setViewport(new QWidget);

    }

}

void SvgView::setHighQualityAntialiasing(bool highQualityAntialiasing)

{

#ifndef QT_NO_OPENGL

    setRenderHint(QPainter::HighQualityAntialiasing, highQualityAntialiasing);

#else

    Q_UNUSED(highQualityAntialiasing);

#endif

}

void SvgView::setViewBackground(bool enable)

{

    if (!m_backgroundItem)

          return;

    m_backgroundItem->setVisible(enable);

}

void SvgView::setViewOutline(bool enable)

{

    if (!m_outlineItem)

        return;

    m_outlineItem->setVisible(enable);

}

void SvgView::paintEvent(QPaintEvent *event)

{

    if (m_renderer == Image) {

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

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

        }

        QPainter imagePainter(&m_image);

        QGraphicsView::render(&imagePainter);

        imagePainter.end();

        QPainter p(viewport());

        p.drawImage(0, 0, m_image);

    } else {

        QGraphicsView::paintEvent(event);

    }

}

void SvgView::wheelEvent(QWheelEvent *event)

{

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

    scale(factor, factor);

    event->accept();

}