dox/Widgets/vtkWidgetSet.h

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

  Program:   Visualization Toolkit
  Module:    vtkWidgetSet.h

  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.

=========================================================================*/
#ifndef __vtkWidgetSet_h
#define __vtkWidgetSet_h

#include "vtkObject.h"
#include <vtkstd/vector> // Required for vector

class vtkAbstractWidget;

//BTX
// Pointer to a member function that takes a vtkAbstractWidget (the active
// child) and another vtkAbstractWidget (the widget to dispatch an action)
// to. All "Action" funtions in a widget must conform to this signature.
template< class TWidget > struct ActionFunction
{
  typedef void (TWidget::*TActionFunctionPointer)(TWidget *dispatcher);
};
//ETX

class VTK_WIDGETS_EXPORT vtkWidgetSet : public vtkObject
{
public:
  static vtkWidgetSet *New();


  vtkTypeMacro(vtkWidgetSet,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);


  virtual void SetEnabled(int);
  vtkBooleanMacro(Enabled, int);

  void AddWidget(vtkAbstractWidget *);

  void RemoveWidget(vtkAbstractWidget *);

  unsigned int GetNumberOfWidgets();

  vtkAbstractWidget *GetNthWidget( unsigned int );

  //BTX
  // TODO: Move this to the protected section. The class vtkAbstractWidget 
  //       should be a friend of this class. 
  typedef vtkstd::vector< vtkAbstractWidget * >   WidgetContainerType;
  typedef WidgetContainerType::iterator           WidgetIteratorType;
  typedef WidgetContainerType::const_iterator     WidgetConstIteratorType;
  WidgetContainerType                             Widget;
 

  template < class TWidget >
  void DispatchAction(TWidget *caller, 
                      typename ActionFunction< TWidget >::TActionFunctionPointer action)
    {
    // Dispatch action to the caller first.
    for (WidgetIteratorType it  = this->Widget.begin(); 
                            it != this->Widget.end()  ; ++it)
      {
      TWidget *w = static_cast<TWidget *>(*it);
      if (caller == w)
        {
        ((*w).*(action))(caller); 
        break;
        }
      }
    
    // Dispatch action to all other widgets
    for (WidgetIteratorType it  = this->Widget.begin(); 
                            it != this->Widget.end()  ; ++it)
      {
      TWidget *w = static_cast<TWidget *>(*it);
      if (caller != w) ((*w).*(action))(caller);
      }
    }
  //ETX

protected:
  vtkWidgetSet();
  ~vtkWidgetSet();

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

#endif

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