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

   Program: ParaView
   Module:    $RCSfile: pqSignalAdaptorCompositeTreeWidget.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.
   28 Corporate Drive
   Clifton Park, NY 12065
   USA

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``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,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

========================================================================*/
#ifndef __pqSignalAdaptorCompositeTreeWidget_h 
#define __pqSignalAdaptorCompositeTreeWidget_h

#include <QObject>
#include <QVariant>
#include "pqComponentsExport.h"


class pqTreeWidgetItem;
class QTreeWidget;
class vtkPVDataInformation;
class vtkSMIntVectorProperty;
class vtkSMOutputPort;
class vtkSMSourceProxy;

/// pqSignalAdaptorCompositeTreeWidget is used to connect a property with
/// vtkSMCompositeTreeDomain as its domain to a Tree widget. It updates the tree
/// to show composite data tree.
/// Caveats: This widget does not handle SINGLE_ITEM selection where non-leaves
/// are acceptable.
class PQCOMPONENTS_EXPORT pqSignalAdaptorCompositeTreeWidget : public QObject
{
  Q_OBJECT
  typedef QObject Superclass;

  Q_PROPERTY(QList<QVariant> values READ values WRITE setValues)
public:
  enum IndexModes
    {
    INDEX_MODE_FLAT,
    INDEX_MODE_LEVEL_INDEX, // this mode works only for 1 level deep trees.
    INDEX_MODE_LEVEL,       // this mode works only for 1 level deep trees. 
    };


  /// Constructor. \c domain is used to build the tree layout to show in the
  /// widget.
  /// \c autoUpdateWidgetVisibility -  is true, the tree widget is hidden if the
  ///                                  data information says that the data is
  ///                                  not composite.
  /// \c showSelectedElementCounts - when true, next to each leaf node, an entry
  ///                                will be added showing the number of
  ///                                selected elements (cells|points).
  pqSignalAdaptorCompositeTreeWidget(QTreeWidget*, vtkSMIntVectorProperty* smproperty,
    bool autoUpdateWidgetVisibility=false,
    bool showSelectedElementCounts=false);

  /// Alternate constructor. 
  /// \c outputport - the output port producing the composite dataset to show. 
  /// \c domainMode - vtkSMCompositeTreeDomain::ALL|LEAVES|NON_LEAVES|NONE. 
  ///                 Indicates what types of nodes in the composite tree 
  ///                 are selectable.
  /// \c indexMode  - indicates how the values are set/get (using
  ///                 composite-flat-index, using level-dataset-index or using 
  ///                 only the level number.
  /// \c selectMultiple - true if possible to select multiple nodes.
  /// \c autoUpdateWidgetVisibility -  is true, the tree widget is hidden if the
  ///                                  data information says that the data is
  ///                                  not composite.
  /// \c showSelectedElementCounts - when true, next to each leaf node, an entry
  ///                                will be added showing the number of
  ///                                selected elements (cells|points).
  pqSignalAdaptorCompositeTreeWidget(QTreeWidget*, vtkSMOutputPort* outputport,
    int domainMode,
    IndexModes indexMode=INDEX_MODE_FLAT,
    bool selectMultiple=false,
    bool autoUpdateWidgetVisibility=false,
    bool showSelectedElementCounts=false);

  /// Destructor
  virtual ~pqSignalAdaptorCompositeTreeWidget();

  /// Returns the current value.
  /// This is a QList of unsigned ints.
  QList<QVariant> values() const;

  /// When set, the adaptor will update the visibility of the widget depending
  /// on whether the data is composite or not.
  void setAutoUpdateWidgetVisibility(bool val)
    { this->AutoUpdateWidgetVisibility = val; }
  bool autoUpdateWidgetVisibility() const
    { return this->AutoUpdateWidgetVisibility; }

  /// Select the item with the given flat index.
  void select(unsigned int flatIndex);

  /// Returns the flat index for the current item.
  unsigned int getCurrentFlatIndex(bool* valid=NULL); 

public slots:
  /// Set the values.
  void setValues(const QList<QVariant>& values);

  /// Called when domain changes.
  void domainChanged();

  /// Called when the output port says that the data information has been
  /// updated.
  void portInformationChanged();

signals:
  /// Fired when the widget value changes.
  void valuesChanged();

private slots:
  
  /// Called to update the labels to show the current selected elements
  /// information.
  void updateSelectionCounts();

private:
  pqSignalAdaptorCompositeTreeWidget(const pqSignalAdaptorCompositeTreeWidget&); // Not implemented.
  void operator=(const pqSignalAdaptorCompositeTreeWidget&); // Not implemented.

  /// Set up the callback to know when the selection changes, so that we can
  /// update the selected cells/points counts.
  void setupSelectionUpdatedCallback(vtkSMSourceProxy* source, unsigned int port);

  void buildTree(pqTreeWidgetItem* item, 
    vtkPVDataInformation* info);

  /// updates the check flags for all the items.
  void updateItemFlags();

  class pqInternal;
  pqInternal* Internal;

  enum MetaData
    {
    FLAT_INDEX = Qt::UserRole,
    LEVEL_NUMBER = Qt::UserRole+1,
    DATASET_INDEX = Qt::UserRole+2,
    NODE_TYPE = Qt::UserRole+3,
    ORIGINAL_LABEL = Qt::UserRole+4
    };

  enum NodeTypes
    {
    LEAF = 21,
    NON_LEAF = 22,
    };

  enum CheckModes
    {
    SINGLE_ITEM,
    MULTIPLE_ITEMS
    };

  IndexModes IndexMode;

  // Determines if the widget should allow checking only 1 item at a time or
  // multiple items should be check-able.
  CheckModes CheckMode;

  // These are used by buildTree() to determin indices for the nodes.
  unsigned int FlatIndex;
  unsigned int LevelNo;

  bool AutoUpdateWidgetVisibility;

  bool ShowIndex;

  bool ShowSelectedElementCounts;

  // When set to true, all pieces within a  multipiece are shown.
  bool ShowDatasetsInMultiPiece;

  /// Code common to both variants of the constructor.
  void constructor(QTreeWidget* tree, bool autoUpdateVisibility);

  /// Called when an item check state is toggled. This is used only when
  /// this->CheckMode == SINGLE_ITEM. We uncheck all other items.
  void updateCheckState(pqTreeWidgetItem* item, int column);

  friend class pqCallbackAdaptor;
  class pqCallbackAdaptor;
  pqCallbackAdaptor* CallbackAdaptor;
};

#endif


