| /**************************************************************************** |
| ** |
| ** Copyright (C) 2017 The Qt Company Ltd. |
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| ** This file is part of the examples of the Qt Toolkit. |
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| ****************************************************************************/ |
| #include "svgview.h" |
| |
| #include <QSvgRenderer> |
| |
| #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(nullptr) |
| , m_backgroundItem(nullptr) |
| , m_outlineItem(nullptr) |
| { |
| 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(); |
| } |
| |
| QSize SvgView::svgSize() const |
| { |
| return m_svgItem ? m_svgItem->boundingRect().size().toSize() : QSize(); |
| } |
| |
| bool SvgView::openFile(const QString &fileName) |
| { |
| QGraphicsScene *s = scene(); |
| |
| const bool drawBackground = (m_backgroundItem ? m_backgroundItem->isVisible() : false); |
| const bool drawOutline = (m_outlineItem ? m_outlineItem->isVisible() : true); |
| |
| QScopedPointer<QGraphicsSvgItem> svgItem(new QGraphicsSvgItem(fileName)); |
| if (!svgItem->renderer()->isValid()) |
| return false; |
| |
| s->clear(); |
| resetTransform(); |
| |
| m_svgItem = svgItem.take(); |
| 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)); |
| return true; |
| } |
| |
| 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::setAntialiasing(bool antialiasing) |
| { |
| setRenderHint(QPainter::Antialiasing, antialiasing); |
| } |
| |
| 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); |
| } |
| |
| qreal SvgView::zoomFactor() const |
| { |
| return transform().m11(); |
| } |
| |
| void SvgView::zoomIn() |
| { |
| zoomBy(2); |
| } |
| |
| void SvgView::zoomOut() |
| { |
| zoomBy(0.5); |
| } |
| |
| void SvgView::resetZoom() |
| { |
| if (!qFuzzyCompare(zoomFactor(), qreal(1))) { |
| resetTransform(); |
| emit zoomChanged(); |
| } |
| } |
| |
| 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) |
| { |
| zoomBy(qPow(1.2, event->angleDelta().y() / 240.0)); |
| } |
| |
| void SvgView::zoomBy(qreal factor) |
| { |
| const qreal currentZoom = zoomFactor(); |
| if ((factor < 1 && currentZoom < 0.1) || (factor > 1 && currentZoom > 10)) |
| return; |
| scale(factor, factor); |
| emit zoomChanged(); |
| } |
| |
| QSvgRenderer *SvgView::renderer() const |
| { |
| if (m_svgItem) |
| return m_svgItem->renderer(); |
| return nullptr; |
| } |