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

        /****************************************************************************
        **
        ** Copyright (C) 2005-2006 Trolltech AS. All rights reserved.
        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be used under the terms of the GNU General Public
        ** License version 2.0 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 GNU
        ** General Public Licensing requirements will be met:
        ** http://www.trolltech.com/products/qt/opensource.html
        **
        ** If you are unsure which license is appropriate for your use, please
        ** review the following information:
        ** http://www.trolltech.com/products/qt/licensing.html or contact the
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        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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        ****************************************************************************/

        #include <QtGui>

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

        SvgWindow::SvgWindow()
            : QScrollArea()
        {
            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);
                #endif
            } else if (renderer == Image)
                view = new SvgRasterView(currentPath, this);
            else
                view = new SvgNativeView(currentPath, this);

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

        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();
        }