Qt 4.3: svgwindow.cpp Example File (painting/svgviewer/svgwindow.cpp)

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# svgwindow.cpp Example File
painting/svgviewer/svgwindow.cpp

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     #include <QtGui>

     #include "svgview.h"
     #include "svgwindow.h"

     SvgWindow::SvgWindow()
         : QScrollArea(),
           highQualityAntialiasing(false)
     {
         QWidget *view = new QWidget(this);
         renderer = SvgWindow::Native;
         setWidget(view);
     }

     void SvgWindow::openFile(const QString &file)
     {
         currentPath = file;
         setRenderer(renderer);
     }

     void SvgWindow::setRenderer(RendererType type)
     {
         renderer = type;
         QWidget *view;

         if (renderer == OpenGL) {
             #ifndef QT_NO_OPENGL
             view = new SvgGLView(currentPath, this);
             qobject_cast<SvgGLView *>(view)->setHighQualityAntialiasing(highQualityAntialiasing);
             #endif
         } else if (renderer == Image) {
             view = new SvgRasterView(currentPath, this);
         } else {
             view = new SvgNativeView(currentPath, this);
         }

         setWidget(view);
         view->show();
     }

     void SvgWindow::setHighQualityAntialiasing(bool hq)
     {
         highQualityAntialiasing = hq;

         #ifndef QT_NO_OPENGL
         QWidget *view = widget();
         if (renderer == OpenGL)
             qobject_cast<SvgGLView *>(view)->setHighQualityAntialiasing(highQualityAntialiasing);
         #endif
     }

     void SvgWindow::mousePressEvent(QMouseEvent *event)
     {
         mousePressPos = event->pos();
         scrollBarValuesOnMousePress.rx() = horizontalScrollBar()->value();
         scrollBarValuesOnMousePress.ry() = verticalScrollBar()->value();
         event->accept();
     }

     void SvgWindow::mouseMoveEvent(QMouseEvent *event)
     {
         if (mousePressPos.isNull()) {
             event->ignore();
             return;
         }

         horizontalScrollBar()->setValue(scrollBarValuesOnMousePress.x() - event->pos().x() + mousePressPos.x());
         verticalScrollBar()->setValue(scrollBarValuesOnMousePress.y() - event->pos().y() + mousePressPos.y());
         horizontalScrollBar()->update();
         verticalScrollBar()->update();
         event->accept();
     }

     void SvgWindow::mouseReleaseEvent(QMouseEvent *event)
     {
         mousePressPos = QPoint();
         event->accept();
     }