vtkInteractorObserver.h

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

  Program:   Visualization Toolkit
  Module:    vtkInteractorObserver.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 vtkInteractorObserver_h
#define vtkInteractorObserver_h

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

class vtkAbstractPropPicker;
class vtkAssemblyPath;
class vtkRenderWindowInteractor;
class vtkRenderer;
class vtkCallbackCommand;
class vtkObserverMediator;
class vtkPickingManager;

class VTKRENDERINGCORE_EXPORT vtkInteractorObserver : public vtkObject
{
public:
  vtkTypeMacro(vtkInteractorObserver,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  virtual void SetEnabled(int) {}
  int GetEnabled() {return this->Enabled;}
  void EnabledOn() {this->SetEnabled(1);}
  void EnabledOff() {this->SetEnabled(0);}
  void On() {this->SetEnabled(1);}
  void Off() {this->SetEnabled(0);}


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


  vtkSetClampMacro(Priority,float,0.0f,1.0f);
  vtkGetMacro(Priority,float);


  vtkBooleanMacro(PickingManaged, bool);
  vtkSetMacro(PickingManaged, bool);
  vtkGetMacro(PickingManaged, bool);


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


  vtkSetMacro(KeyPressActivationValue,char);
  vtkGetMacro(KeyPressActivationValue,char);


  vtkGetObjectMacro(DefaultRenderer,vtkRenderer);
  virtual void SetDefaultRenderer(vtkRenderer*);


  vtkGetObjectMacro(CurrentRenderer,vtkRenderer);
  virtual void SetCurrentRenderer(vtkRenderer*);

  virtual void OnChar();


  static void ComputeDisplayToWorld(vtkRenderer *ren, double x, double y,
                                    double z, double worldPt[4]);
  static void ComputeWorldToDisplay(vtkRenderer *ren, double x, double y,
                                    double z, double displayPt[3]);


  void GrabFocus(vtkCommand *mouseEvents, vtkCommand *keypressEvents=nullptr);
  void ReleaseFocus();

protected:
  vtkInteractorObserver();
  ~vtkInteractorObserver() override;


  virtual void StartInteraction();
  virtual void EndInteraction();

  static void ProcessEvents(vtkObject* object,
                            unsigned long event,
                            void* clientdata,
                            void* calldata);


  void ComputeDisplayToWorld(double x, double y, double z,
                             double worldPt[4]);
  void ComputeWorldToDisplay(double x, double y, double z,
                             double displayPt[3]);

  // The state of the widget, whether on or off (observing events or not)
  int Enabled;

  // Used to process events
  vtkCallbackCommand* EventCallbackCommand; //subclasses use one
  vtkCallbackCommand* KeyPressCallbackCommand; //listens to key activation

  // Priority at which events are processed
  float Priority;

  // This variable controls whether the picking is managed by the Picking
  // Manager process or not. True by default.
  bool PickingManaged;

  virtual void RegisterPickers();

  void UnRegisterPickers();

  virtual void PickersModified();

  vtkPickingManager* GetPickingManager();

  vtkAssemblyPath* GetAssemblyPath(double X, double Y, double Z,
                                   vtkAbstractPropPicker* picker);

  // Keypress activation controls
  int KeyPressActivation;
  char KeyPressActivationValue;

  // Used to associate observers with the interactor
  vtkRenderWindowInteractor *Interactor;

  // Internal ivars for processing events
  vtkRenderer *CurrentRenderer;
  vtkRenderer *DefaultRenderer;

  unsigned long CharObserverTag;
  unsigned long DeleteObserverTag;

  // The mediator used to request resources from the interactor.
  vtkObserverMediator *ObserverMediator;
  int RequestCursorShape(int requestedShape);

private:
  vtkInteractorObserver(const vtkInteractorObserver&) = delete;
  void operator=(const vtkInteractorObserver&) = delete;

};

#endif