- Qt 5.5
- Qt Widgets
- Simple DOM Model Example
- dommodel.cpp Example File
- Qt 5.5.1 Reference Documentation

# 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.
    **   * 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();
    }