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

  Program:   ParaView
  Module:    vtkTrackballPan.h

  Copyright (c) Kitware, Inc.
  All rights reserved.
  See Copyright.txt or http://www.paraview.org/HTML/Copyright.html 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.

=========================================================================*/
/**
 * @class   vtkTrackballPan
 * @brief   Pans camera with x y mouse movements.
 *
 * vtkTrackballPan allows the user to interactively
 * manipulate the camera, the viewpoint of the scene.
 * Moving the mouse down zooms in. Up zooms out.
 * This manipulator has not been extended to parallel projection yet.
 * It works in perspective by rotating the camera.
 */

#ifndef vtkTrackballPan_h
#define vtkTrackballPan_h

#include "vtkCameraManipulator.h"
#include "vtkPVVTKExtensionsInteractionStyleModule.h" // needed for export macro
#include <memory>                                     // for std::unique_ptr

class VTKPVVTKEXTENSIONSINTERACTIONSTYLE_EXPORT vtkTrackballPan : public vtkCameraManipulator
{
public:
  static vtkTrackballPan* New();
  vtkTypeMacro(vtkTrackballPan, vtkCameraManipulator);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  void OnKeyUp(vtkRenderWindowInteractor*) override;
  void OnKeyDown(vtkRenderWindowInteractor*) override;

  //@{
  /**
   * Event bindings controlling the effects of pressing mouse buttons
   * or moving the mouse.
   */
  void OnMouseMove(int x, int y, vtkRenderer* ren, vtkRenderWindowInteractor* iren) override;
  void OnButtonDown(int x, int y, vtkRenderer* ren, vtkRenderWindowInteractor* iren) override;
  void OnButtonUp(int x, int y, vtkRenderer* ren, vtkRenderWindowInteractor* iren) override;
  //@}

protected:
  vtkTrackballPan();
  ~vtkTrackballPan() override;

  vtkTrackballPan(const vtkTrackballPan&) = delete;
  void operator=(const vtkTrackballPan&) = delete;

  struct Internal;
  std::unique_ptr<Internal> Internals;
};

#endif
