Qt 4.8: framecapture.cpp Example File (webkit/framecapture/framecapture.cpp)

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# framecapture.cpp Example File

webkit/framecapture/framecapture.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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     ****************************************************************************/

     #include "framecapture.h"

     #include <iostream>
     #include <QtWebKit>

     FrameCapture::FrameCapture(): QObject(), m_percent(0)
     {
         connect(&m_page, SIGNAL(loadProgress(int)), this, SLOT(printProgress(int)));
         connect(&m_page, SIGNAL(loadFinished(bool)), this, SLOT(saveResult(bool)));
     }

     void FrameCapture::load(const QUrl &url, const QString &outputFileName)
     {
         std::cout << "Loading " << qPrintable(url.toString()) << std::endl;
         m_percent = 0;
         int index = outputFileName.lastIndexOf('.');
         m_fileName = (index == -1) ? outputFileName + ".png" : outputFileName;
         m_page.mainFrame()->load(url);
         m_page.mainFrame()->setScrollBarPolicy(Qt::Vertical, Qt::ScrollBarAlwaysOff);
         m_page.mainFrame()->setScrollBarPolicy(Qt::Horizontal, Qt::ScrollBarAlwaysOff);
         m_page.setViewportSize(QSize(1024, 768));
     }

     void FrameCapture::printProgress(int percent)
     {
         if (m_percent >= percent)
             return;

         while (m_percent++ < percent)
             std::cout << "#" << std::flush;
     }

     void FrameCapture::saveResult(bool ok)
     {
         std::cout << std::endl;

         // crude error-checking
         if (!ok) {
             std::cerr << "Failed loading " << qPrintable(m_page.mainFrame()->url().toString()) << std::endl;
             emit finished();
             return;
         }

         // save each frame in different image files
         saveFrame(m_page.mainFrame());

         emit finished();
     }

     void FrameCapture::saveFrame(QWebFrame *frame)
     {
         static int frameCounter = 0;

         QString fileName(m_fileName);
         if (frameCounter) {
             int index = m_fileName.lastIndexOf('.');
             fileName = fileName.insert(index, "_frame" + QString::number(frameCounter));
         }

         QImage image(frame->contentsSize(), QImage::Format_ARGB32_Premultiplied);
         image.fill(Qt::transparent);

         QPainter painter(&image);
         painter.setRenderHint(QPainter::Antialiasing, true);
         painter.setRenderHint(QPainter::TextAntialiasing, true);
         painter.setRenderHint(QPainter::SmoothPixmapTransform, true);
         frame->documentElement().render(&painter);
         painter.end();

         image.save(fileName);

         ++frameCounter;
         foreach(QWebFrame *childFrame, frame->childFrames())
             saveFrame(childFrame);
     }