dox/Widgets/vtkAbstractWidget.h

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

  Program:   Visualization Toolkit
  Module:    vtkAbstractWidget.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.

=========================================================================*/
#ifndef __vtkAbstractWidget_h
#define __vtkAbstractWidget_h

#include "vtkInteractorObserver.h"

class vtkWidgetEventTranslator;
class vtkWidgetCallbackMapper;
class vtkWidgetRepresentation;


class VTK_WIDGETS_EXPORT vtkAbstractWidget : public vtkInteractorObserver
{
public:

  vtkTypeMacro(vtkAbstractWidget,vtkInteractorObserver);
  void PrintSelf(ostream& os, vtkIndent indent);

  virtual void SetEnabled(int);


  vtkSetClampMacro(ProcessEvents, int, 0, 1);
  vtkGetMacro(ProcessEvents, int);
  vtkBooleanMacro(ProcessEvents, int);


  vtkWidgetEventTranslator *GetEventTranslator()
    {return this->EventTranslator;}
  
  virtual void CreateDefaultRepresentation() = 0;

  void Render();


  void SetParent(vtkAbstractWidget *parent) {this->Parent = parent;}
  vtkGetObjectMacro(Parent,vtkAbstractWidget);


  vtkWidgetRepresentation *GetRepresentation()
    {
      this->CreateDefaultRepresentation();
      return this->WidgetRep;
    }
  

  vtkSetMacro(ManagesCursor,int);
  vtkGetMacro(ManagesCursor,int);
  vtkBooleanMacro(ManagesCursor,int);

  virtual void SetPriority( float );

protected:
  vtkAbstractWidget();
  ~vtkAbstractWidget();

  // Handles the events; centralized here for all widgets.
  static void ProcessEventsHandler(vtkObject* object, unsigned long event,
                            void* clientdata, void* calldata);

  // The representation for the widget. This is typically called by the
  // SetRepresentation() methods particular to each widget (i.e. subclasses
  // of this class). This method does the actual work; the SetRepresentation()
  // methods constrain the type that can be set.
  void SetWidgetRepresentation(vtkWidgetRepresentation *r);
  vtkWidgetRepresentation *WidgetRep;

  // helper methods for cursor management
  int ManagesCursor;
  virtual void SetCursor(int vtkNotUsed(state)) {}

  // For translating and invoking events
  vtkWidgetEventTranslator *EventTranslator;
  vtkWidgetCallbackMapper  *CallbackMapper;

  // The parent, if any, for this widget
  vtkAbstractWidget *Parent;

  // Call data which can be retrieved by the widget. This data is set
  // by ProcessEvents() if call data is provided during a callback
  // sequence.
  void *CallData;

  // Flag indicating if the widget should handle interaction events.
  // On by default.
  int ProcessEvents;

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

#endif

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