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# treeitem.cpp Example File
itemviews/editabletreemodel/treeitem.cpp

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     /*
         treeitem.cpp

         A container for items of data supplied by the simple tree model.
     */

     #include <QStringList>

     #include "treeitem.h"

     TreeItem::TreeItem(const QVector<QVariant> &data, TreeItem *parent)
     {
         parentItem = parent;
         itemData = data;
     }

     TreeItem::~TreeItem()
     {
         qDeleteAll(childItems);
     }

     TreeItem *TreeItem::child(int number)
     {
         return childItems.value(number);
     }

     int TreeItem::childCount() const
     {
         return childItems.count();
     }

     int TreeItem::childNumber() const
     {
         if (parentItem)
             return parentItem->childItems.indexOf(const_cast<TreeItem*>(this));

         return 0;
     }

     int TreeItem::columnCount() const
     {
         return itemData.count();
     }

     QVariant TreeItem::data(int column) const
     {
         return itemData.value(column);
     }

     bool TreeItem::insertChildren(int position, int count, int columns)
     {
         if (position < 0 || position > childItems.size())
             return false;

         for (int row = 0; row < count; ++row) {
             QVector<QVariant> data(columns);
             TreeItem *item = new TreeItem(data, this);
             childItems.insert(position, item);
         }

         return true;
     }

     bool TreeItem::insertColumns(int position, int columns)
     {
         if (position < 0 || position > itemData.size())
             return false;

         for (int column = 0; column < columns; ++column)
             itemData.insert(position, QVariant());

         foreach (TreeItem *child, childItems)
             child->insertColumns(position, columns);

         return true;
     }

     TreeItem *TreeItem::parent()
     {
         return parentItem;
     }

     bool TreeItem::removeChildren(int position, int count)
     {
         if (position < 0 || position + count > childItems.size())
             return false;

         for (int row = 0; row < count; ++row)
             delete childItems.takeAt(position);

         return true;
     }

     bool TreeItem::removeColumns(int position, int columns)
     {
         if (position < 0 || position + columns > itemData.size())
             return false;

         for (int column = 0; column < columns; ++column)
             itemData.remove(position);

         foreach (TreeItem *child, childItems)
             child->removeColumns(position, columns);

         return true;
     }

     bool TreeItem::setData(int column, const QVariant &value)
     {
         if (column < 0 || column >= itemData.size())
             return false;

         itemData[column] = value;
         return true;
     }