TGLPShapeRef.cxx

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// @(#)root/gl:$Id$
// Author:  Matevz Tadel, Feb 2007
 
/*************************************************************************
 * Copyright (C) 1995-2004, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#include "TGLPShapeRef.h"
#include "TGLPhysicalShape.h"
 
/** \class TGLPShapeRef
\ingroup opengl
Base class for references to TGLPysicalShape that need to be notified
when the shape is destroyed.
Could also deliver 'change' notifications.
*/
 
 
////////////////////////////////////////////////////////////////////////////////
/// Default constructor.
 
TGLPShapeRef::TGLPShapeRef() :
   fNextPSRef (nullptr),
   fPShape    (nullptr)
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Constructor with known shape - reference it.
 
TGLPShapeRef::TGLPShapeRef(TGLPhysicalShape * shape) :
   fNextPSRef (nullptr),
   fPShape    (nullptr)
{
   SetPShape(shape);
}
////////////////////////////////////////////////////////////////////////////////
/// Destructor - unreference the shape if set.
 
TGLPShapeRef::~TGLPShapeRef()
{
   SetPShape(nullptr);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set the shape. Unreference the old and reference the new.
/// This is virtual so that sub-classes can perform other tasks
/// on change. This function should be called first from there.
///
/// This is also called from destructor of the referenced physical
/// shape with 0 argument.
 
void TGLPShapeRef::SetPShape(TGLPhysicalShape * shape)
{
   if (fPShape)
      fPShape->RemoveReference(this);
   fPShape = shape;
   if (fPShape)
      fPShape->AddReference(this);
}
 
////////////////////////////////////////////////////////////////////////////////
/// This is called from physical shape when it is modified.
/// Sub-classes can override and take appropriate action.
 
void TGLPShapeRef::PShapeModified()
{
}