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

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);
  virtual void SetPickingManaged(bool managed);
  vtkGetMacro(PickingManaged, bool);


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


  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();

  vtkPickingManager* GetPickingManager();

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

  // Keypress activation controls
  vtkTypeBool 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