Qt 5.9 | Qt Widgets | Simple DOM Model Example | dommodel.cpp Example File

Qt 5.9.9 Reference Documentation

# dommodel.cpp Example File

itemviews/simpledommodel/dommodel.cpp

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      #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();
      }