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virtual bool canFetchMore(const QModelIndex &parent) const;
	virtual void fetchMore(const QModelIndex & parent);
	virtual bool hasChildren(const QModelIndex &parent) const;

	virtual bool insertRows(int row, int count, const QModelIndex &parent /* = QModelIndex() */);
	virtual bool removeRows(int position, int rows, const QModelIndex & parent = QModelIndex());

void StatTreeCtrl::fetchMore(const QModelIndex & parent)
{
	StatisticItem* item = getItem(parent);

	beginInsertRows(parent, 0, item->children().size() - 1);


	endInsertRows();
}

bool StatTreeCtrl::hasChildren(const QModelIndex & parent) const
{
	if (!parent.isValid())
	{
		StatisticItem* item = getItem(parent);
		if (item->children().count() > 0)
			return true;
	}
	return QAbstractItemModel::hasChildren(parent);
}

bool StatTreeCtrl::canFetchMore(const QModelIndex & parent) const
{
	StatisticItem* item = getItem(parent);
	if (item->children().count() > 0)
		return true;
	else return false;
}

bool StatTreeCtrl::insertRows(int position, int rows, const QModelIndex& parent /* = QModelIndex() */)
{
	StatisticItem* parentItem = getItem(parent);
	bool success;

	beginInsertRows(parent, position, position + rows - 1);
	success = parentItem->insertChildren(position, rows);
	endInsertRows();

	return success;
}

bool StatTreeCtrl::removeRows(int position, int rows, const QModelIndex & parent)
{
	StatisticItem *parentItem = getItem(parent);//static_cast<StatisticItem*>(parent.internalPointer());
	bool success = true;

	beginRemoveRows(parent, position, position + rows - 1);
	success = parentItem->removeChildren(position, rows);
	endRemoveRows();

	return success;
}

StatisticItem * StatTreeCtrl::getItem(const QModelIndex & index) const
{
	if (index.isValid()) {
		StatisticItem *item = static_cast<StatisticItem*>(index.internalPointer());
		if (item)
			return item;
	}
	return rootItem;
}