How to move table view tree item along with its children with custom data.

[sumit kang]

This is the header file for my tree item

class TreeItem
 {
public:
	explicit TreeItem( Container *data , TreeItem *parent = 0 );
	~TreeItem();
	TreeItem *parent();
	void appendChild(TreeItem *child);
 
	TreeItem *child(int iNumber);
	int childCount() const;
	int childNumber() const;
	Container data() const ;
	Container* GetContainer();
	bool setData(Container* data , QVariant value);
	void setContainer( Container* data);
	bool insertChildren(int position, int count );
	bool removeChildren( int position  , int count );
	void removeChild(int row);
	void removeChild(TreeItem* itm);
	std::string getChildName(int row);
	std::string getName();
	int row() const;
	void insertChild(int pos, TreeItem *child);
 
private:
	QList<TreeItem*> childItems;
	Container* itemData;
	TreeItem* parentItem;
};

class TreeItem
 {
public:
	explicit TreeItem( Container *data , TreeItem *parent = 0 );
	~TreeItem();
	TreeItem *parent();
	void appendChild(TreeItem *child);

	TreeItem *child(int iNumber);
	int childCount() const;
	int childNumber() const;
	Container data() const ;
	Container* GetContainer();
	bool setData(Container* data , QVariant value);
	void setContainer( Container* data);
	bool insertChildren(int position, int count );
	bool removeChildren( int position  , int count );
	void removeChild(int row);
	void removeChild(TreeItem* itm);
	std::string getChildName(int row);
	std::string getName();
	int row() const;
	void insertChild(int pos, TreeItem *child);

private:
	QList<TreeItem*> childItems;
	Container* itemData;
	TreeItem* parentItem;
};

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//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
Each tree item holds a pointer reference to a container object.

when i move or copy( Cntrl Pressed) a single tree item i create a new instance of tree item and copy the data from the old item.

Currently in my code i am able to do this for single item , how to do it for a item having multiple children.

////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

bool dropMimeData(const QMimeData *mimeData, Qt::DropAction action, int row, int column, const QModelIndex &parent)
{
	if (!mimeData->hasFormat(s_treeNodeMimeType)) {
		return false;
	}
	QByteArray data = mimeData->data(s_treeNodeMimeType);
	QDataStream stream(&data, QIODevice::ReadOnly);
	qint64 senderPid;
	stream >> senderPid;
	if (senderPid != QCoreApplication::applicationPid()) {
		return false;
	}
	TreeItem *parentNode = getItem(parent);
	int count;
	stream >> count;
	if (row == -1) {
		if (parent.isValid())
			row = 0;
		else			
			row = rowCount(parent);
	}
	TreeItem *node;
	for (int i = 0; i < count; ++i) {
		qlonglong nodePtr;
		stream >> nodePtr;
		node = reinterpret_cast<TreeItem *>(nodePtr);
		if (node->row() < row  && parentNode == node->parent())
			--row;
 
		TreeItem *nodeNew = new TreeItem(node->GetContainer(), parentNode);  // Create a new Data item using the node container's data.
		beginInsertRows(parent, row, row);
		parentNode->insertChild(row, nodeNew);
		endInsertRows();
		++row;
 
	}
 
	if (QGuiApplication::keyboardModifiers() != Qt::ControlModifier)
	{
		removeItem(node);
	}	
	return true;
}

bool dropMimeData(const QMimeData *mimeData, Qt::DropAction action, int row, int column, const QModelIndex &parent)
{
	if (!mimeData->hasFormat(s_treeNodeMimeType)) {
		return false;
	}
	QByteArray data = mimeData->data(s_treeNodeMimeType);
	QDataStream stream(&data, QIODevice::ReadOnly);
	qint64 senderPid;
	stream >> senderPid;
	if (senderPid != QCoreApplication::applicationPid()) {
		return false;
	}
	TreeItem *parentNode = getItem(parent);
	int count;
	stream >> count;
	if (row == -1) {
		if (parent.isValid())
			row = 0;
		else			
			row = rowCount(parent);
	}
	TreeItem *node;
	for (int i = 0; i < count; ++i) {
		qlonglong nodePtr;
		stream >> nodePtr;
		node = reinterpret_cast<TreeItem *>(nodePtr);
		if (node->row() < row  && parentNode == node->parent())
			--row;

		TreeItem *nodeNew = new TreeItem(node->GetContainer(), parentNode);  // Create a new Data item using the node container's data.
		beginInsertRows(parent, row, row);
		parentNode->insertChild(row, nodeNew);
		endInsertRows();
		++row;
		
	}

	if (QGuiApplication::keyboardModifiers() != Qt::ControlModifier)
	{
		removeItem(node);
	}	
	return true;
}

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