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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkActor2DCollection.h,v $

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
// .NAME vtkActor2DCollection -  a list of 2D actors
// .SECTION Description
// vtkActor2DCollection is a subclass of vtkCollection.  vtkActor2DCollection
// maintains a collection of vtkActor2D objects that is sorted by layer
// number, with lower layer numbers at the start of the list.  This allows
// the vtkActor2D objects to be rendered in the correct order. 

// .SECTION See Also
// vtkActor2D vtkCollection

#ifndef __vtkActor2DCollection_h
#define __vtkActor2DCollection_h

#include "vtkPropCollection.h"

#include "vtkActor2D.h" // Needed for inline methods

class vtkViewport;

class VTK_FILTERING_EXPORT vtkActor2DCollection : public vtkPropCollection
{
 public:
  // Description:
  // Desctructor for the vtkActor2DCollection class. This removes all 
  // objects from the collection.
  static vtkActor2DCollection *New();

  vtkTypeRevisionMacro(vtkActor2DCollection,vtkPropCollection);

  // Description:
  // Sorts the vtkActor2DCollection by layer number.  Smaller layer
  // numbers are first.  Layer numbers can be any integer value.
  void Sort();
  
  // Description:
  // Add an actor to the list.  The new actor is inserted in the list
  // according to it's layer number.
  void AddItem(vtkActor2D *a);

  // Description:
  // Standard Collection methods
  int IsItemPresent(vtkActor2D *a);
  vtkActor2D *GetNextActor2D();
  vtkActor2D *GetLastActor2D();

  // Description:
 // Access routines that are provided for compatibility with previous
 // version of VTK.  Please use the GetNextActor2D(), GetLastActor2D()
 // variants where possible.
 vtkActor2D *GetNextItem();
 vtkActor2D *GetLastItem();

    
  // Description:
  // Sort and then render the collection of 2D actors.  
  void RenderOverlay(vtkViewport* viewport);

  //BTX
  // Description: 
  // Reentrant safe way to get an object in a collection. Just pass the
  // same cookie back and forth. 
  vtkActor2D *GetNextActor2D(vtkCollectionSimpleIterator &cookie) {
    return static_cast<vtkActor2D *>(this->GetNextItemAsObject(cookie));};
  //ETX

protected:
  vtkActor2DCollection() {};
  ~vtkActor2DCollection();

  virtual void DeleteElement(vtkCollectionElement *); 

private:
  // hide the standard AddItem from the user and the compiler.
  void AddItem(vtkObject *o) { this->vtkCollection::AddItem(o); };
  void AddItem(vtkProp *o) { this->vtkPropCollection::AddItem(o); };
  int IsItemPresent(vtkObject *o) { return this->vtkCollection::IsItemPresent(o); };

private:
  vtkActor2DCollection(const vtkActor2DCollection&);  // Not implemented.
  void operator=(const vtkActor2DCollection&);  // Not implemented.
};

inline int vtkActor2DCollection::IsItemPresent(vtkActor2D *a) 
{
  return this->vtkCollection::IsItemPresent((vtkObject *)a);
}

inline vtkActor2D *vtkActor2DCollection::GetNextActor2D() 
{ 
  return static_cast<vtkActor2D *>(this->GetNextItemAsObject());
}

inline vtkActor2D *vtkActor2DCollection::GetLastActor2D() 
{ 
  if ( this->Bottom == NULL )
    {
    return NULL;
    }
  else
    {
    return static_cast<vtkActor2D *>(this->Bottom->Item);
    }
}

inline vtkActor2D *vtkActor2DCollection::GetNextItem() 
{ 
  return this->GetNextActor2D();
}

inline vtkActor2D *vtkActor2DCollection::GetLastItem() 
{
  return this->GetLastActor2D();
}

#endif





