Qt 4.5: dommodel.cpp Example File (itemviews/simpledommodel/dommodel.cpp)

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# dommodel.cpp Example File
itemviews/simpledommodel/dommodel.cpp

     /****************************************************************************
     **
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     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
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     ** Licensees holding valid Qt Commercial licenses may use this file in
     ** accordance with the Qt Commercial License Agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and Nokia.
     **
     ** GNU Lesser General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU Lesser
     ** General Public License version 2.1 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.LGPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU Lesser General Public License version 2.1 requirements
     ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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     ** rights.  These rights are described in the Nokia Qt LGPL Exception
     ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU General Public License version 3.0 requirements will be
     ** met: http://www.gnu.org/copyleft/gpl.html.
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     #include <QtGui>
     #include <QtXml>

     #include "domitem.h"
     #include "dommodel.h"

     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 Qt::ItemIsEnabled | Qt::ItemIsSelectable;
     }

     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();
     }