xbel.cpp Example File | Qt WebEngine 5.9

Qt 5.9 | Qt WebEngine | WebEngine Demo Browser Example | xbel.cpp Example File

Qt 5.9.9 Reference Documentation

# xbel.cpp Example File

webenginewidgets/demobrowser/xbel.cpp

      /****************************************************************************
      **
      ** Copyright (C) 2016 The Qt Company Ltd.
      ** Contact: https://www.qt.io/licensing/
      **
      ** This file is part of the examples of the Qt Toolkit.
      **
      ** $QT_BEGIN_LICENSE:BSD$
      ** Commercial License Usage
      ** Licensees holding valid commercial Qt licenses may use this file in
      ** accordance with the commercial license agreement provided with the
      ** Software or, alternatively, in accordance with the terms contained in
      ** a written agreement between you and The Qt Company. For licensing terms
      ** and conditions see https://www.qt.io/terms-conditions. For further
      ** information use the contact form at https://www.qt.io/contact-us.
      **
      ** BSD License Usage
      ** Alternatively, 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 "xbel.h"

      #include <QtCore/QFile>

      BookmarkNode::BookmarkNode(BookmarkNode::Type type, BookmarkNode *parent) :
           expanded(false)
         , m_parent(parent)
         , m_type(type)
      {
          if (parent)
              parent->add(this);
      }

      BookmarkNode::~BookmarkNode()
      {
          if (m_parent)
              m_parent->remove(this);
          qDeleteAll(m_children);
          m_parent = 0;
          m_type = BookmarkNode::Root;
      }

      bool BookmarkNode::operator==(const BookmarkNode &other)
      {
          if (url != other.url
              || title != other.title
              || desc != other.desc
              || expanded != other.expanded
              || m_type != other.m_type
              || m_children.count() != other.m_children.count())
              return false;

          for (int i = 0; i < m_children.count(); ++i)
              if (!((*(m_children[i])) == (*(other.m_children[i]))))
                  return false;
          return true;
      }

      BookmarkNode::Type BookmarkNode::type() const
      {
          return m_type;
      }

      void BookmarkNode::setType(Type type)
      {
          m_type = type;
      }

      QList<BookmarkNode *> BookmarkNode::children() const
      {
          return m_children;
      }

      BookmarkNode *BookmarkNode::parent() const
      {
          return m_parent;
      }

      void BookmarkNode::add(BookmarkNode *child, int offset)
      {
          Q_ASSERT(child->m_type != Root);
          if (child->m_parent)
              child->m_parent->remove(child);
          child->m_parent = this;
          if (-1 == offset)
              offset = m_children.size();
          m_children.insert(offset, child);
      }

      void BookmarkNode::remove(BookmarkNode *child)
      {
          child->m_parent = 0;
          m_children.removeAll(child);
      }

      XbelReader::XbelReader()
      {
      }

      BookmarkNode *XbelReader::read(const QString &fileName)
      {
          QFile file(fileName);
          if (!file.exists()) {
              return new BookmarkNode(BookmarkNode::Root);
          }
          file.open(QFile::ReadOnly);
          return read(&file);
      }

      BookmarkNode *XbelReader::read(QIODevice *device)
      {
          BookmarkNode *root = new BookmarkNode(BookmarkNode::Root);
          setDevice(device);
          if (readNextStartElement()) {
              QString version = attributes().value(QLatin1String("version")).toString();
              if (name() == QLatin1String("xbel")
                  && (version.isEmpty() || version == QLatin1String("1.0"))) {
                  readXBEL(root);
              } else {
                  raiseError(QObject::tr("The file is not an XBEL version 1.0 file."));
              }
          }
          return root;
      }

      void XbelReader::readXBEL(BookmarkNode *parent)
      {
          Q_ASSERT(isStartElement() && name() == QLatin1String("xbel"));

          while (readNextStartElement()) {
              if (name() == QLatin1String("folder"))
                  readFolder(parent);
              else if (name() == QLatin1String("bookmark"))
                  readBookmarkNode(parent);
              else if (name() == QLatin1String("separator"))
                  readSeparator(parent);
              else
                  skipCurrentElement();
          }
      }

      void XbelReader::readFolder(BookmarkNode *parent)
      {
          Q_ASSERT(isStartElement() && name() == QLatin1String("folder"));

          BookmarkNode *folder = new BookmarkNode(BookmarkNode::Folder, parent);
          folder->expanded = (attributes().value(QLatin1String("folded")) == QLatin1String("no"));

          while (readNextStartElement()) {
              if (name() == QLatin1String("title"))
                  readTitle(folder);
              else if (name() == QLatin1String("desc"))
                  readDescription(folder);
              else if (name() == QLatin1String("folder"))
                  readFolder(folder);
              else if (name() == QLatin1String("bookmark"))
                  readBookmarkNode(folder);
              else if (name() == QLatin1String("separator"))
                  readSeparator(folder);
              else
                  skipCurrentElement();
          }
      }

      void XbelReader::readTitle(BookmarkNode *parent)
      {
          Q_ASSERT(isStartElement() && name() == QLatin1String("title"));
          parent->title = readElementText();
      }

      void XbelReader::readDescription(BookmarkNode *parent)
      {
          Q_ASSERT(isStartElement() && name() == QLatin1String("desc"));
          parent->desc = readElementText();
      }

      void XbelReader::readSeparator(BookmarkNode *parent)
      {
          new BookmarkNode(BookmarkNode::Separator, parent);
          // empty elements have a start and end element
          readNext();
      }

      void XbelReader::readBookmarkNode(BookmarkNode *parent)
      {
          Q_ASSERT(isStartElement() && name() == QLatin1String("bookmark"));
          BookmarkNode *bookmark = new BookmarkNode(BookmarkNode::Bookmark, parent);
          bookmark->url = attributes().value(QLatin1String("href")).toString();
          while (readNextStartElement()) {
              if (name() == QLatin1String("title"))
                  readTitle(bookmark);
              else if (name() == QLatin1String("desc"))
                  readDescription(bookmark);
              else
                  skipCurrentElement();
          }
          if (bookmark->title.isEmpty())
              bookmark->title = QObject::tr("Unknown title");
      }

      XbelWriter::XbelWriter()
      {
          setAutoFormatting(true);
      }

      bool XbelWriter::write(const QString &fileName, const BookmarkNode *root)
      {
          QFile file(fileName);
          if (!root || !file.open(QFile::WriteOnly))
              return false;
          return write(&file, root);
      }

      bool XbelWriter::write(QIODevice *device, const BookmarkNode *root)
      {
          setDevice(device);

          writeStartDocument();
          writeDTD(QLatin1String("<!DOCTYPE xbel>"));
          writeStartElement(QLatin1String("xbel"));
          writeAttribute(QLatin1String("version"), QLatin1String("1.0"));
          if (root->type() == BookmarkNode::Root) {
              for (int i = 0; i < root->children().count(); ++i)
                  writeItem(root->children().at(i));
          } else {
              writeItem(root);
          }

          writeEndDocument();
          return true;
      }

      void XbelWriter::writeItem(const BookmarkNode *parent)
      {
          switch (parent->type()) {
          case BookmarkNode::Folder:
              writeStartElement(QLatin1String("folder"));
              writeAttribute(QLatin1String("folded"), parent->expanded ? QLatin1String("no") : QLatin1String("yes"));
              writeTextElement(QLatin1String("title"), parent->title);
              for (int i = 0; i < parent->children().count(); ++i)
                  writeItem(parent->children().at(i));
              writeEndElement();
              break;
          case BookmarkNode::Bookmark:
              writeStartElement(QLatin1String("bookmark"));
              if (!parent->url.isEmpty())
                  writeAttribute(QLatin1String("href"), parent->url);
              writeTextElement(QLatin1String("title"), parent->title);
              if (!parent->desc.isEmpty())
                  writeAttribute(QLatin1String("desc"), parent->desc);
              writeEndElement();
              break;
          case BookmarkNode::Separator:
              writeEmptyElement(QLatin1String("separator"));
              break;
          default:
              break;
          }
      }