vtkObserverMediator.h

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

  Program:   Visualization Toolkit
  Module:    vtkObserverMediator.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 vtkObserverMediator_h
#define vtkObserverMediator_h

#include "vtkRenderingCoreModule.h" // For export macro
#include "vtkObject.h"

class vtkRenderWindowInteractor;
class vtkInteractorObserver;
class vtkObserverMap;


class VTKRENDERINGCORE_EXPORT vtkObserverMediator : public vtkObject
{
public:
  static vtkObserverMediator *New();


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


  void SetInteractor(vtkRenderWindowInteractor* iren);
  vtkGetObjectMacro(Interactor, vtkRenderWindowInteractor);

  int RequestCursorShape(vtkInteractorObserver*, int cursorShape);

  void RemoveAllCursorShapeRequests(vtkInteractorObserver*);

protected:
  vtkObserverMediator();
  ~vtkObserverMediator() override;

  // The render window whose cursor we are controlling
  vtkRenderWindowInteractor *Interactor;

  // A map whose key is the observer*, and whose data value is a cursor
  // request. Note that a special compare function is used to sort the
  // widgets based on the observer's priority.
  vtkObserverMap *ObserverMap; //given a widget*, return its data

  // The current observer and cursor shape
  vtkInteractorObserver *CurrentObserver;
  int                    CurrentCursorShape;

private:
  vtkObserverMediator(const vtkObserverMediator&) = delete;
  void operator=(const vtkObserverMediator&) = delete;
};

#endif