Qt 5.11 | Qt Widgets | Simple DOM Model Example | dommodel.cpp Example File

Qt 5.11.3 Reference Documentation

# dommodel.cpp Example File

itemviews/simpledommodel/dommodel.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 "domitem.h"
      #include "dommodel.h"

      #include <QtXml>

      DomModel::DomModel(QDomDocument document, QObject *parent)
          : QAbstractItemModel(parent), domDocument(document)
      {
          rootItem = new DomItem(domDocument, 0);
      }

      DomModel::~DomModel()
      {
          delete rootItem;
      }

      int DomModel::columnCount(const QModelIndex &/*parent*/) const
      {
          return 3;
      }

      QVariant DomModel::data(const QModelIndex &index, int role) const
      {
          if (!index.isValid())
              return QVariant();

          if (role != Qt::DisplayRole)
              return QVariant();

          DomItem *item = static_cast<DomItem*>(index.internalPointer());

          QDomNode node = item->node();
          QStringList attributes;
          QDomNamedNodeMap attributeMap = node.attributes();

          switch (index.column()) {
              case 0:
                  return node.nodeName();
              case 1:
                  for (int i = 0; i < attributeMap.count(); ++i) {
                      QDomNode attribute = attributeMap.item(i);
                      attributes << attribute.nodeName() + "=\""
                                    +attribute.nodeValue() + '"';
                  }
                  return attributes.join(' ');
              case 2:
                  return node.nodeValue().split("\n").join(' ');
              default:
                  return QVariant();
          }
      }

      Qt::ItemFlags DomModel::flags(const QModelIndex &index) const
      {
          if (!index.isValid())
              return 0;

          return QAbstractItemModel::flags(index);
      }

      QVariant DomModel::headerData(int section, Qt::Orientation orientation,
                                    int role) const
      {
          if (orientation == Qt::Horizontal && role == Qt::DisplayRole) {
              switch (section) {
                  case 0:
                      return tr("Name");
                  case 1:
                      return tr("Attributes");
                  case 2:
                      return tr("Value");
                  default:
                      return QVariant();
              }
          }

          return QVariant();
      }

      QModelIndex DomModel::index(int row, int column, const QModelIndex &parent)
                  const
      {
          if (!hasIndex(row, column, parent))
              return QModelIndex();

          DomItem *parentItem;

          if (!parent.isValid())
              parentItem = rootItem;
          else
              parentItem = static_cast<DomItem*>(parent.internalPointer());

          DomItem *childItem = parentItem->child(row);
          if (childItem)
              return createIndex(row, column, childItem);
          else
              return QModelIndex();
      }

      QModelIndex DomModel::parent(const QModelIndex &child) const
      {
          if (!child.isValid())
              return QModelIndex();

          DomItem *childItem = static_cast<DomItem*>(child.internalPointer());
          DomItem *parentItem = childItem->parent();

          if (!parentItem || parentItem == rootItem)
              return QModelIndex();

          return createIndex(parentItem->row(), 0, parentItem);
      }

      int DomModel::rowCount(const QModelIndex &parent) const
      {
          if (parent.column() > 0)
              return 0;

          DomItem *parentItem;

          if (!parent.isValid())
              parentItem = rootItem;
          else
              parentItem = static_cast<DomItem*>(parent.internalPointer());

          return parentItem->node().childNodes().count();
      }