/*=========================================================================

   Program: ParaView
   Module:    $RCSfile: pqCustomFilterDefinitionModel.h,v $

   Copyright (c) 2005-2008 Sandia Corporation, Kitware Inc.
   All rights reserved.

   ParaView is a free software; you can redistribute it and/or modify it
   under the terms of the ParaView license version 1.2. 

   See License_v1.2.txt for the full ParaView license.
   A copy of this license can be obtained by contacting
   Kitware Inc.
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``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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========================================================================*/

/// \file pqCustomFilterDefinitionModel.h
/// \date 6/19/2006

#ifndef _pqCustomFilterDefinitionModel_h
#define _pqCustomFilterDefinitionModel_h


#include "pqComponentsExport.h"
#include <QAbstractItemModel>

class pqCustomFilterDefinitionModelItem;
class pqPipelineSource;
class pqServerManagerSelection;
class QPixmap;


/// \class pqCustomFilterDefinitionModel
/// \brief
///   The pqCustomFilterDefinitionModel class stores the sources that
///   define a compound proxy in a hierarchical format.
///
/// The hierarchical format is similar to the pqPipelineModel. The
/// custom filter definition model contains only sources. It does not
/// include any server objects, since the custom filter must be
/// defined on one server.
class PQCOMPONENTS_EXPORT pqCustomFilterDefinitionModel : public QAbstractItemModel
{
public:
  enum ItemType
    {
    Invalid = -1,
    Source = 0,
    Filter,
    CustomFilter,
    Link,
    LastType = Link
    };

public:
  pqCustomFilterDefinitionModel(QObject *parent=0);
  virtual ~pqCustomFilterDefinitionModel();

  /// \name QAbstractItemModel Methods
  //@{
  /// \brief
  ///   Gets the number of rows for a given index.
  /// \param parent The parent index.
  /// \return
  ///   The number of rows for the given index.
  virtual int rowCount(const QModelIndex &parent=QModelIndex()) const;

  /// \brief
  ///   Gets the number of columns for a given index.
  /// \param parent The parent index.
  /// \return
  ///   The number of columns for the given index.
  virtual int columnCount(const QModelIndex &parent=QModelIndex()) const;

  /// \brief
  ///   Gets whether or not the given index has child items.
  /// \param parent The parent index.
  /// \return
  ///   True if the given index has child items.
  virtual bool hasChildren(const QModelIndex &parent=QModelIndex()) const;

  /// \brief
  ///   Gets a model index for a given location.
  /// \param row The row number.
  /// \param column The column number.
  /// \param parent The parent index.
  /// \return
  ///   A model index for the given location.
  virtual QModelIndex index(int row, int column,
      const QModelIndex &parent=QModelIndex()) const;

  /// \brief
  ///   Gets the parent for a given index.
  /// \param index The model index.
  /// \return
  ///   A model index for the parent of the given index.
  virtual QModelIndex parent(const QModelIndex &index) const;

  /// \brief
  ///   Gets the data for a given model index.
  /// \param index The model index.
  /// \param role The role to get data for.
  /// \return
  ///   The data for the given model index.
  virtual QVariant data(const QModelIndex &index,
      int role=Qt::DisplayRole) const;

  /// \brief
  ///   Gets the flags for a given model index.
  ///
  /// The flags for an item indicate if it is enabled, editable, etc.
  ///
  /// \param index The model index.
  /// \return
  ///   The flags for the given model index.
  virtual Qt::ItemFlags flags(const QModelIndex &index) const;
  //@}

  /// \brief
  ///   Sets the contents of the custom filter definition model.
  ///
  /// The \c items are added to the custom filter definition model in
  /// a hierarchy similar to the pipeline model. Only the items in the
  /// list are added to the hierarchy.
  ///
  /// \param items The list of selected model items.
  void setContents(const pqServerManagerSelection *items);

  /// \brief
  ///   Gets the next index in the model's tree hierarchy.
  /// \param index The current model index.
  /// \return
  ///   A model index for the next item in the hierarchy.
  QModelIndex getNextIndex(const QModelIndex &index) const;

  /// \brief
  ///   Gets the source associated with an index.
  /// \param index The model index to look up.
  /// \return
  ///   A pointer to the source object or null if there is none.
  pqPipelineSource *getSourceFor(const QModelIndex &index) const;

private:
  /// \brief
  ///   Gets the model object associated with the index.
  /// \param index The model index to convert.
  /// \return
  ///   A pointer to the model object or null if there is none.
  pqCustomFilterDefinitionModelItem *getModelItemFor(
      const QModelIndex &index) const;

  /// \brief
  ///   Gets the next item in the tree.
  /// \param item The current model item.
  /// \return
  ///   A pointer to the next model item or null if the end is reached.
  pqCustomFilterDefinitionModelItem *getNextItem(
      pqCustomFilterDefinitionModelItem *item) const;

private:
  pqCustomFilterDefinitionModelItem *Root; ///< The root of the model tree.
  QPixmap *PixmapList;                     ///< Stores the item icons.
};

#endif
