/****************************************************************************

**

** Copyright (C) 2009 Stephen Kelly <steveire@gmail.com>

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the test suite of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

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** This file contains pre-release code and may not be distributed.

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** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

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** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

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**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

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****************************************************************************/

#ifndef DYNAMICTREEMODEL_H

#define DYNAMICTREEMODEL_H

#include <QtCore/QAbstractItemModel>

#include <QtCore/QHash>

#include <QtCore/QList>

template<typename T> class QList;

class DynamicTreeModel : public QAbstractItemModel

{

  Q_OBJECT

public:

  DynamicTreeModel(QObject *parent = 0);

  QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const;

  QModelIndex parent(const QModelIndex &index) const;

  int rowCount(const QModelIndex &index = QModelIndex()) const;

  int columnCount(const QModelIndex &index = QModelIndex()) const;

  QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const;

  void clear();

protected slots:

  /**

  Finds the parent id of the string with id @p searchId.

  Returns -1 if not found.

  */

  qint64 findParentId(qint64 searchId) const;

private:

  QHash<qint64, QString> m_items;

  QHash<qint64, QList<QList<qint64> > > m_childItems;

  qint64 nextId;

  qint64 newId() { return nextId++; };

  QModelIndex m_nextParentIndex;

  int m_nextRow;

  int m_depth;

  int maxDepth;

  friend class ModelInsertCommand;

  friend class ModelMoveCommand;

  friend class ModelResetCommand;

  friend class ModelResetCommandFixed;

};

class ModelChangeCommand : public QObject

{

  Q_OBJECT

public:

  ModelChangeCommand( DynamicTreeModel *model, QObject *parent = 0 );

  virtual ~ModelChangeCommand() {}

  void setAncestorRowNumbers(QList<int> rowNumbers) { m_rowNumbers = rowNumbers; }

  QModelIndex findIndex(QList<int> rows);

  void setStartRow(int row) { m_startRow = row; }

  void setEndRow(int row) { m_endRow = row; }

  void setNumCols(int cols) { m_numCols = cols; }

  virtual void doCommand() = 0;

protected:

  DynamicTreeModel* m_model;

  QList<int> m_rowNumbers;

  int m_numCols;

  int m_startRow;

  int m_endRow;

};

typedef QList<ModelChangeCommand*> ModelChangeCommandList;

class ModelInsertCommand : public ModelChangeCommand

{

  Q_OBJECT

public:

  ModelInsertCommand(DynamicTreeModel *model, QObject *parent = 0 );

  virtual ~ModelInsertCommand() {}

  virtual void doCommand();

};

class ModelMoveCommand : public ModelChangeCommand

{

  Q_OBJECT

public:

  ModelMoveCommand(DynamicTreeModel *model, QObject *parent);

  virtual ~ModelMoveCommand() {}

  virtual bool emitPreSignal(const QModelIndex &srcParent, int srcStart, int srcEnd, const QModelIndex &destParent, int destRow);

  virtual void doCommand();

  virtual void emitPostSignal();

  void setDestAncestors( QList<int> rows ) { m_destRowNumbers = rows; }

  void setDestRow(int row) { m_destRow = row; }

protected:

  QList<int> m_destRowNumbers;

  int m_destRow;

};

/**

  A command which does a move and emits a reset signal.

*/

class ModelResetCommand : public ModelMoveCommand

{

  Q_OBJECT

public:

  ModelResetCommand(DynamicTreeModel* model, QObject* parent = 0);

  virtual ~ModelResetCommand();

  virtual bool emitPreSignal(const QModelIndex &srcParent, int srcStart, int srcEnd, const QModelIndex &destParent, int destRow);

  virtual void emitPostSignal();

};

/**

  A command which does a move and emits a beginResetModel and endResetModel signals.

*/

class ModelResetCommandFixed : public ModelMoveCommand

{

  Q_OBJECT

public:

  ModelResetCommandFixed(DynamicTreeModel* model, QObject* parent = 0);

  virtual ~ModelResetCommandFixed();

  virtual bool emitPreSignal(const QModelIndex &srcParent, int srcStart, int srcEnd, const QModelIndex &destParent, int destRow);

  virtual void emitPostSignal();

};

#endif