Create example for WebEngine's Print To Pdf

Adds example command line tool 'html2pdf' that loads a URL into
QWebEnginePage and prints it to a pdf file.

Task-number: QTBUG-59823
Change-Id: I898e9a9ecdf819f417876f964d40e494f6095c99
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: Michael Brüning <michael.bruning@qt.io>

1 files changed, 136 insertions, 0 deletions

diff --git a/examples/webenginewidgets/html2pdf/html2pdf.cpp b/examples/webenginewidgets/html2pdf/html2pdf.cpp
new file mode 100644
index 000000000..44e692a22
--- /dev/null
+++ b/examples/webenginewidgets/html2pdf/html2pdf.cpp
@@ -0,0 +1,136 @@
+/****************************************************************************
+**
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** 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 The Qt Company Ltd 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,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QApplication>
+#include <QCommandLineParser>
+#include <QFile>
+#include <QWebEnginePage>
+
+#include <functional>
+
+using namespace std;
+using namespace std::placeholders;
+
+class Html2PdfConverter : public QObject
+{
+    Q_OBJECT
+public:
+    explicit Html2PdfConverter(QString inputPath, QString outputPath);
+    int run();
+
+private slots:
+    void loadFinished(bool ok);
+    void pdfPrintingFinished(const QString &filePath, bool success);
+
+private:
+    QString m_inputPath;
+    QString m_outputPath;
+    QScopedPointer<QWebEnginePage> m_page;
+};
+
+Html2PdfConverter::Html2PdfConverter(QString inputPath, QString outputPath)
+    : m_inputPath(move(inputPath))
+    , m_outputPath(move(outputPath))
+    , m_page(new QWebEnginePage)
+{
+    connect(m_page.data(), &QWebEnginePage::loadFinished,
+            this, &Html2PdfConverter::loadFinished);
+    connect(m_page.data(), &QWebEnginePage::pdfPrintingFinished,
+            this, &Html2PdfConverter::pdfPrintingFinished);
+}
+
+int Html2PdfConverter::run()
+{
+    m_page->load(QUrl::fromUserInput(m_inputPath));
+    return QApplication::exec();
+}
+
+void Html2PdfConverter::loadFinished(bool ok)
+{
+    if (!ok) {
+        QTextStream(stderr)
+            << tr("failed to load URL '%1'").arg(m_inputPath) << "\n";
+        QCoreApplication::exit(1);
+        return;
+    }
+
+    m_page->printToPdf(m_outputPath);
+}
+
+void Html2PdfConverter::pdfPrintingFinished(const QString &filePath, bool success)
+{
+    if (!success) {
+        QTextStream(stderr)
+            << tr("failed to print to output file '%1'").arg(filePath) << "\n";
+        QCoreApplication::exit(1);
+    } else {
+        QCoreApplication::quit();
+    }
+}
+
+int main(int argc, char *argv[])
+{
+    QApplication app(argc, argv);
+    QCoreApplication::setApplicationName("html2pdf");
+    QCoreApplication::setApplicationVersion(QT_VERSION_STR);
+
+    QCommandLineParser parser;
+    parser.setApplicationDescription(
+        QCoreApplication::translate("main", "Converts the web page INPUT into the PDF file OUTPUT."));
+    parser.addHelpOption();
+    parser.addVersionOption();
+    parser.addPositionalArgument(
+        QCoreApplication::translate("main", "INPUT"),
+        QCoreApplication::translate("main", "Input URL for PDF conversion."));
+    parser.addPositionalArgument(
+        QCoreApplication::translate("main", "OUTPUT"),
+        QCoreApplication::translate("main", "Output file name for PDF conversion."));
+
+    parser.process(QCoreApplication::arguments());
+
+    const QStringList requiredArguments = parser.positionalArguments();
+    if (requiredArguments.size() != 2)
+        parser.showHelp(1);
+
+    Html2PdfConverter converter(requiredArguments.at(0), requiredArguments.at(1));
+    return converter.run();
+}
+
+#include "html2pdf.moc"