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 "vtkInteractionWidgetsModule.h" // For export macro
#include "vtkObject.h"
#include <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" functions in a widget must conform to this signature.
template< class TWidget > struct ActionFunction
{
  typedef void (TWidget::*TActionFunctionPointer)(TWidget *dispatcher);
};
//ETX
 
class VTKINTERACTIONWIDGETS_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 std::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