Qt 4.8: dommodel.cpp Example File (itemviews/simpledommodel/dommodel.cpp)

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# dommodel.cpp Example File

itemviews/simpledommodel/dommodel.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://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.
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     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     **
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     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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();
     }