framecapture.cpp Example File | Qt WebKit Examples 5.4

- Qt 5.4
- Qt WebKit Examples
- WebKit Frame Capture Example
- framecapture.cpp Example File
- Qt 5.4.2 Reference Documentation

# framecapture.cpp Example File

webkitwidgets/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.
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    **     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.
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    #include "framecapture.h"

    #include <iostream>

    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);
    }