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

  Program:   Visualization Toolkit
  Module:    vtkInteractorStyle.cxx

  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.

=========================================================================*/
#include "vtkInteractorStyle.h"

#include "vtkActor.h"
#include "vtkActor2D.h"
#include "vtkAssemblyNode.h"
#include "vtkAssemblyPath.h"
#include "vtkCallbackCommand.h"
#include "vtkCellPicker.h"
#include "vtkCommand.h"
#include "vtkMath.h" 
#include "vtkObjectFactory.h"
#include "vtkOutlineSource.h"
#include "vtkPolyDataMapper.h"
#include "vtkProperty.h"
#include "vtkProperty2D.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkTextProperty.h"

vtkCxxRevisionMacro(vtkInteractorStyle, "1.99");
vtkStandardNewMacro(vtkInteractorStyle);

//----------------------------------------------------------------------------
vtkInteractorStyle::vtkInteractorStyle() 
{
  this->State               = VTKIS_NONE;
  this->AnimState           = VTKIS_ANIM_OFF; 

  this->HandleObservers     = 1;
  this->UseTimers           = 0;

  this->AutoAdjustCameraClippingRange = 1;
  
  this->Interactor          = NULL;

  this->EventCallbackCommand->SetCallback(vtkInteractorStyle::ProcessEvents);

  // These widgets are not activated with a key

  this->KeyPressActivation  = 0; 

  this->Outline             = vtkOutlineSource::New();
  this->OutlineActor        = NULL;
  this->OutlineMapper       = vtkPolyDataMapper::New();

  this->OutlineMapper->SetInput(this->Outline->GetOutput());

  this->PickedRenderer      = NULL;
  this->CurrentProp         = NULL;
  this->PropPicked          = 0;

  this->PickColor[0]        = 1.0; 
  this->PickColor[1]        = 0.0; 
  this->PickColor[2]        = 0.0;
  this->PickedActor2D       = NULL;

  this->MouseWheelMotionFactor = 1.0;
}

//----------------------------------------------------------------------------
vtkInteractorStyle::~vtkInteractorStyle()
{
  // Remove observers

  this->SetInteractor(0);

  // Remove any highlight

  this->HighlightProp(NULL);

  if ( this->OutlineActor ) 
    {
    this->OutlineActor->Delete();
    }

  if ( this->OutlineMapper ) 
    {
    this->OutlineMapper->Delete();
    }

  this->Outline->Delete();
  this->Outline = NULL;

  this->SetCurrentRenderer(NULL);
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::SetEnabled(int enabling)
{
  if ( ! this->Interactor )
    {
    vtkErrorMacro(<<"The interactor must be set prior to enabling/disabling widget");
    return;
    }

  if ( enabling ) //----------------------------------------------------------
    {
    vtkDebugMacro(<<"Enabling widget");

    if ( this->Enabled ) //already enabled, just return
      {
      return;
      }
    
    this->Enabled = 1;
    this->InvokeEvent(vtkCommand::EnableEvent,NULL);
    }

  else //disabling-------------------------------------------------------------
    {
    vtkDebugMacro(<<"Disabling widget");

    if ( ! this->Enabled ) //already disabled, just return
      {
      return;
      }
    
    this->Enabled = 0;
    this->HighlightProp(NULL);
    this->InvokeEvent(vtkCommand::DisableEvent,NULL);
    }
}

//----------------------------------------------------------------------------
// NOTE!!! This does not do any reference counting!!!
// This is to avoid some ugly reference counting loops 
// and the benefit of being able to hold only an entire
// renderwindow from an interactor style doesn't seem worth the
// mess.   Instead the vtkInteractorStyle sets up a DeleteEvent callback, so
// that it can tell when the vtkRenderWindowInteractor is going away.

void vtkInteractorStyle::SetInteractor(vtkRenderWindowInteractor *i)
{
  if(i == this->Interactor)
    {
    return;
    }

  // if we already have an Interactor then stop observing it
  if(this->Interactor)
    {
    this->Interactor->RemoveObserver(this->EventCallbackCommand);
    }
  this->Interactor = i;

  // add observers for each of the events handled in ProcessEvents
  if(i)
    {
    i->AddObserver(vtkCommand::EnterEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::LeaveEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::MouseMoveEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::LeftButtonPressEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::LeftButtonReleaseEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::MiddleButtonPressEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::MiddleButtonReleaseEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::RightButtonPressEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::RightButtonReleaseEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::MouseWheelForwardEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::MouseWheelBackwardEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::ExposeEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::ConfigureEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::TimerEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::KeyPressEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::KeyReleaseEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::CharEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);

    i->AddObserver(vtkCommand::DeleteEvent, 
                   this->EventCallbackCommand, 
                   this->Priority);
    }
}


//----------------------------------------------------------------------------
void vtkInteractorStyle::FindPokedRenderer(int x,int y) 
{
  this->SetCurrentRenderer(this->Interactor->FindPokedRenderer(x,y));
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::HighlightProp(vtkProp *prop) 
{
  this->CurrentProp = prop;

  if ( prop != NULL )
    {
    vtkActor2D *actor2D;
    vtkProp3D *prop3D;
    if ( (prop3D=vtkProp3D::SafeDownCast(prop)) != NULL )
      {
      this->HighlightProp3D(prop3D);
      }
    else if ( (actor2D=vtkActor2D::SafeDownCast(prop)) != NULL )
      {
      this->HighlightActor2D(actor2D);
      }
    }
  else
    {//unhighlight everything, both 2D & 3D
    this->HighlightProp3D(NULL);
    this->HighlightActor2D(NULL);
    }

  if (this->Interactor)
    {
    this->Interactor->Render();
    }
}

//----------------------------------------------------------------------------
// When pick action successfully selects a vtkProp3Dactor, this method
// highlights the vtkProp3D appropriately. Currently this is done by placing a
// bounding box around the vtkProp3D.
void vtkInteractorStyle::HighlightProp3D(vtkProp3D *prop3D) 
{
  //no prop picked now 
  if ( ! prop3D) 
    {
    //was there previously?
    if (this->PickedRenderer != NULL && this->OutlineActor) 
      {
      this->PickedRenderer->RemoveActor(this->OutlineActor);
      this->PickedRenderer = NULL;
      }
    }
  //prop picked now 
  else
    {
    if ( ! this->OutlineActor ) 
      {
      // have to defer creation to get right type
      this->OutlineActor = vtkActor::New();
      this->OutlineActor->PickableOff();
      this->OutlineActor->DragableOff();
      this->OutlineActor->SetMapper(this->OutlineMapper);
      this->OutlineActor->GetProperty()->SetColor(this->PickColor);
      this->OutlineActor->GetProperty()->SetAmbient(1.0);
      this->OutlineActor->GetProperty()->SetDiffuse(0.0);
      }
  
    //check if picked in different renderer to previous pick
    if (this->CurrentRenderer != this->PickedRenderer)
      {
      if (this->PickedRenderer != NULL && this->OutlineActor)
        {
        this->PickedRenderer->RemoveActor(this->OutlineActor);
        }
      this->CurrentRenderer->AddActor(this->OutlineActor);
      this->PickedRenderer = this->CurrentRenderer;      
      }
    this->Outline->SetBounds(prop3D->GetBounds());
    }
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::HighlightActor2D(vtkActor2D *actor2D) 
{
  // If nothing has changed, just return
  if ( actor2D == this->PickedActor2D )
    {
    return;
    }

  if ( actor2D )
    {
    if ( this->PickedActor2D )
      {
      actor2D->GetProperty()->SetColor(
        this->PickedActor2D->GetProperty()->GetColor());
      this->PickedActor2D->GetProperty()->SetColor(this->PickColor);
      }
    else
      {
      double tmpColor[3];
      actor2D->GetProperty()->GetColor(tmpColor);
      actor2D->GetProperty()->SetColor(this->PickColor);
      this->PickColor[0] = tmpColor[0];
      this->PickColor[1] = tmpColor[1];
      this->PickColor[2] = tmpColor[2];
      }
    }
  else
    {
    if ( this->PickedActor2D )
      {
      double tmpColor[3];
      this->PickedActor2D->GetProperty()->GetColor(tmpColor);
      this->PickedActor2D->GetProperty()->SetColor(this->PickColor);
      this->PickColor[0] = tmpColor[0];
      this->PickColor[1] = tmpColor[1];
      this->PickColor[2] = tmpColor[2];
      }
    }
  
  this->PickedActor2D = actor2D;
}

//----------------------------------------------------------------------------
// Implementation of motion state control methods
//----------------------------------------------------------------------------
void vtkInteractorStyle::StartState(int newstate) 
{
  this->State = newstate;
  if (this->AnimState == VTKIS_ANIM_OFF) 
    {
    vtkRenderWindowInteractor *rwi = this->Interactor;
    rwi->GetRenderWindow()->SetDesiredUpdateRate(rwi->GetDesiredUpdateRate());
    this->InvokeEvent(vtkCommand::StartInteractionEvent, NULL);
    if (this->UseTimers && !rwi->CreateTimer(VTKI_TIMER_FIRST)) 
      {
      vtkErrorMacro(<< "Timer start failed");
      this->State = VTKIS_NONE;
      }
    }
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::StopState() 
{
  this->State = VTKIS_NONE;
  if (this->AnimState == VTKIS_ANIM_OFF) 
    {   
    vtkRenderWindowInteractor *rwi = this->Interactor;
    vtkRenderWindow *renwin = rwi->GetRenderWindow();
    renwin->SetDesiredUpdateRate(rwi->GetStillUpdateRate());
    if (this->UseTimers && !rwi->DestroyTimer()) 
      {
      vtkErrorMacro(<< "Timer stop failed");
      }
    this->InvokeEvent(vtkCommand::EndInteractionEvent, NULL);
    rwi->Render();
    }   
}

//----------------------------------------------------------------------------
// JCP animation control 
void vtkInteractorStyle::StartAnimate() 
{
  vtkRenderWindowInteractor *rwi = this->Interactor;
  this->AnimState = VTKIS_ANIM_ON;
  if (this->State == VTKIS_NONE) 
    {   
    rwi->GetRenderWindow()->SetDesiredUpdateRate(rwi->GetDesiredUpdateRate());
    if (this->UseTimers && !rwi->CreateTimer(VTKI_TIMER_FIRST) ) 
      {
      vtkErrorMacro(<< "Timer start failed");
      }
    }   
  rwi->Render();
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::StopAnimate() 
{
  vtkRenderWindowInteractor *rwi = this->Interactor;
  this->AnimState = VTKIS_ANIM_OFF;
  if (this->State == VTKIS_NONE) 
    {   
    rwi->GetRenderWindow()->SetDesiredUpdateRate(rwi->GetStillUpdateRate());
    if (this->UseTimers && !rwi->DestroyTimer() ) 
      {
      vtkErrorMacro(<< "Timer stop failed");
      }
    }   
}

// JCP Animation control
//----------------------------------------------------------------------------
void vtkInteractorStyle::StartRotate() 
{
  if (this->State != VTKIS_NONE) 
    {
    return;
    }
  this->StartState(VTKIS_ROTATE);
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::EndRotate() 
{
  if (this->State != VTKIS_ROTATE) 
    {
    return;
    }
  this->StopState();
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::StartZoom() 
{
  if (this->State != VTKIS_NONE) 
    {
    return;
    }
  this->StartState(VTKIS_ZOOM);
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::EndZoom() 
{
  if (this->State != VTKIS_ZOOM) 
    {
    return;
    }
  this->StopState();
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::StartPan() 
{
  if (this->State != VTKIS_NONE) 
    {
    return;
    }
  this->StartState(VTKIS_PAN);
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::EndPan() 
{
  if (this->State != VTKIS_PAN) 
    {
    return;
    }
  this->StopState();
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::StartSpin() 
{
  if (this->State != VTKIS_NONE) 
    {
    return;
    }
  this->StartState(VTKIS_SPIN);
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::EndSpin() 
{
  if (this->State != VTKIS_SPIN) 
    {
    return;
    }
  this->StopState();
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::StartDolly() 
{
  if (this->State != VTKIS_NONE) 
    {
    return;
    }
  this->StartState(VTKIS_DOLLY);
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::EndDolly() 
{
    if (this->State != VTKIS_DOLLY) 
      {
      return;
      }
    this->StopState();
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::StartUniformScale() 
{
  if (this->State != VTKIS_NONE) 
    {
    return;
    }
  this->StartState(VTKIS_USCALE);
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::EndUniformScale() 
{
  if (this->State != VTKIS_USCALE) 
    {
    return;
    }
  this->StopState();
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::StartTimer() 
{
  if (this->State != VTKIS_NONE) 
    {
    return;
    }
  this->StartState(VTKIS_TIMER);
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::EndTimer() 
{
  if (this->State != VTKIS_TIMER) 
    {
    return;
    }
  this->StopState();
}

//----------------------------------------------------------------------------
// By overriding the Rotate, Rotate members we can
// use this timer routine for Joystick or Trackball - quite tidy
//----------------------------------------------------------------------------
void vtkInteractorStyle::OnTimer() 
{
  vtkRenderWindowInteractor *rwi = this->Interactor;

  switch (this->State) 
    {
    case VTKIS_NONE:
      if (this->AnimState == VTKIS_ANIM_ON)
        {
        if (this->UseTimers)
          {
          rwi->DestroyTimer();
          }
        rwi->Render();
        if (this->UseTimers)
          {
          rwi->CreateTimer(VTKI_TIMER_FIRST);
          }
        }
      break;

    case VTKIS_ROTATE:
      this->Rotate();
      if (this->UseTimers)
        {
        rwi->CreateTimer(VTKI_TIMER_UPDATE);
        }
      break;

    case VTKIS_PAN:
      this->Pan();
      if (this->UseTimers)
        {
        rwi->CreateTimer(VTKI_TIMER_UPDATE);
        }
      break;

    case VTKIS_SPIN:
      this->Spin();
      if (this->UseTimers)
        {
        rwi->CreateTimer(VTKI_TIMER_UPDATE);
        }
      break;

    case VTKIS_DOLLY:
      this->Dolly();
      if (this->UseTimers)
        {
        rwi->CreateTimer(VTKI_TIMER_UPDATE);
        }
      break;

    case VTKIS_ZOOM:
      this->Zoom();
      if (this->UseTimers)
        {
        rwi->CreateTimer(VTKI_TIMER_UPDATE);
        }
      break;

    case VTKIS_USCALE:
      this->UniformScale();
      if (this->UseTimers)
        {
        rwi->CreateTimer(VTKI_TIMER_UPDATE);
        }
      break;

    case VTKIS_TIMER:
      rwi->Render();
      if (this->UseTimers)
        {
        rwi->CreateTimer(VTKI_TIMER_UPDATE);
        }
      break;

    default:
      break;
    }
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::OnChar() 
{
  vtkRenderWindowInteractor *rwi = this->Interactor;

  switch (rwi->GetKeyCode()) 
    {
    case 'm' :
    case 'M' :
      if (this->AnimState == VTKIS_ANIM_OFF) 
        {
        this->StartAnimate();
        }
      else 
        {
        this->StopAnimate();
        }
      break;

    case 'Q' :
    case 'q' :
    case 'e' :
    case 'E' :
      rwi->ExitCallback();
      break;

    case 'f' :      
    case 'F' :
      {
      this->AnimState = VTKIS_ANIM_ON;
      vtkAssemblyPath *path = NULL;
      this->FindPokedRenderer(rwi->GetEventPosition()[0],
                              rwi->GetEventPosition()[1]);
      rwi->GetPicker()->Pick(rwi->GetEventPosition()[0],
                             rwi->GetEventPosition()[1], 
                             0.0, 
                             this->CurrentRenderer);
      vtkAbstractPropPicker *picker;
      if ((picker=vtkAbstractPropPicker::SafeDownCast(rwi->GetPicker())))
        {
        path = picker->GetPath();
        }
      if (path != NULL)
        {
        rwi->FlyTo(this->CurrentRenderer, picker->GetPickPosition());
        }
      this->AnimState = VTKIS_ANIM_OFF;
      }
      break;

    case 'u' :
    case 'U' :
      rwi->UserCallback();
      break;

    case 'r' :
    case 'R' :
      this->FindPokedRenderer(rwi->GetEventPosition()[0], 
                              rwi->GetEventPosition()[1]);
      this->CurrentRenderer->ResetCamera();
      rwi->Render();
      break;

    case 'w' :
    case 'W' :
      {
      vtkActorCollection *ac;
      vtkActor *anActor, *aPart;
      vtkAssemblyPath *path;
      this->FindPokedRenderer(rwi->GetEventPosition()[0],
                              rwi->GetEventPosition()[1]);
      ac = this->CurrentRenderer->GetActors();
      vtkCollectionSimpleIterator ait;
      for (ac->InitTraversal(ait); (anActor = ac->GetNextActor(ait)); ) 
        {
        for (anActor->InitPathTraversal(); (path=anActor->GetNextPath()); ) 
          {
          aPart=(vtkActor *)path->GetLastNode()->GetViewProp();
          aPart->GetProperty()->SetRepresentationToWireframe();
          }
        }
      rwi->Render();
      }
      break;

    case 's' :
    case 'S' :
      {
      vtkActorCollection *ac;
      vtkActor *anActor, *aPart;
      vtkAssemblyPath *path;
      this->FindPokedRenderer(rwi->GetEventPosition()[0],
                              rwi->GetEventPosition()[1]);
      ac = this->CurrentRenderer->GetActors();
      vtkCollectionSimpleIterator ait;
      for (ac->InitTraversal(ait); (anActor = ac->GetNextActor(ait)); ) 
        {
        for (anActor->InitPathTraversal(); (path=anActor->GetNextPath()); ) 
          {
          aPart=(vtkActor *)path->GetLastNode()->GetViewProp();
          aPart->GetProperty()->SetRepresentationToSurface();
          }
        }
      rwi->Render();
      }
      break;

    case '3' :
      if (rwi->GetRenderWindow()->GetStereoRender()) 
        {
        rwi->GetRenderWindow()->StereoRenderOff();
        }
      else 
        {
        rwi->GetRenderWindow()->StereoRenderOn();
        }
      rwi->Render();
      break;

    case 'p' :
    case 'P' :
      if (this->State == VTKIS_NONE) 
        {
        vtkAssemblyPath *path = NULL;
        int *eventPos = rwi->GetEventPosition();
        this->FindPokedRenderer(eventPos[0], eventPos[1]);
        rwi->StartPickCallback();
        vtkAbstractPropPicker *picker = 
          vtkAbstractPropPicker::SafeDownCast(rwi->GetPicker());
        if ( picker != NULL )
          {
          picker->Pick(eventPos[0], eventPos[1], 
                       0.0, this->CurrentRenderer);
          path = picker->GetPath();
          }
        if ( path == NULL )
          {
          this->HighlightProp(NULL);
          this->PropPicked = 0;
          }
        else
          {
          this->HighlightProp(path->GetFirstNode()->GetViewProp());
          this->PropPicked = 1;
          }
        rwi->EndPickCallback();
        }
      break;
    }
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);

  os << indent << "Auto Adjust Camera Clipping Range " 
     << (this->AutoAdjustCameraClippingRange  ? "On\n" : "Off\n");

  os << indent << "Pick Color: (" << this->PickColor[0] << ", "
     << this->PickColor[1] << ", "
     << this->PickColor[2] << ")\n";

  os << indent << "CurrentRenderer: " << this->CurrentRenderer << "\n";
  if ( this->PickedRenderer )
    {
    os << indent << "Picked Renderer: " << this->PickedRenderer << "\n";
    }
  else
    {
    os << indent << "Picked Renderer: (none)\n";
    }
  if ( this->CurrentProp )
    {
    os << indent << "Current Prop: " << this->CurrentProp << "\n";
    }
  else
    {
    os << indent << "Current Actor: (none)\n";
    }

  os << indent << "Interactor: " << this->Interactor << "\n";
  os << indent << "Prop Picked: " <<
    (this->PropPicked ? "Yes\n" : "No\n");
  
  os << indent << "State: " << this->State << endl;
  os << indent << "UseTimers: " << this->UseTimers << endl;
  os << indent << "HandleObservers: " << this->HandleObservers << endl;
  os << indent << "MouseWheelMotionFactor: " << this->MouseWheelMotionFactor << endl;
}

//----------------------------------------------------------------------------
void vtkInteractorStyle::ProcessEvents(vtkObject* vtkNotUsed(object), 
                                       unsigned long event,
                                       void* clientdata, 
                                       void* vtkNotUsed(calldata))
{
  vtkInteractorStyle* self 
    = reinterpret_cast<vtkInteractorStyle *>( clientdata );

  switch(event)
    {
    case vtkCommand::ExposeEvent:
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::ExposeEvent)) 
        {
        self->InvokeEvent(vtkCommand::ExposeEvent,NULL);
        }
      else 
        {
        self->OnExpose();
        }
      break;

    case vtkCommand::ConfigureEvent:
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::ConfigureEvent)) 
        {
        self->InvokeEvent(vtkCommand::ConfigureEvent,NULL);
        }
      else 
        {
        self->OnConfigure();
        }
      break;

    case vtkCommand::EnterEvent:  
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::EnterEvent)) 
        {
        self->InvokeEvent(vtkCommand::EnterEvent, NULL);
        }
      else
        {
        self->OnEnter();
        }
      break;

    case vtkCommand::LeaveEvent:
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::LeaveEvent)) 
        {
        self->InvokeEvent(vtkCommand::LeaveEvent,NULL);
        }
      else
        {
        self->OnLeave();
        }
      break;

    case vtkCommand::TimerEvent: 
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::TimerEvent)) 
        {
        self->InvokeEvent(vtkCommand::TimerEvent,NULL);
        }
      else 
        {
        self->OnTimer();
        }
      break;

    case vtkCommand::MouseMoveEvent: 
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::MouseMoveEvent)) 
        {
        self->InvokeEvent(vtkCommand::MouseMoveEvent,NULL);
        }
      else
        {
        self->OnMouseMove();
        }
      break;

    case vtkCommand::LeftButtonPressEvent: 
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::LeftButtonPressEvent)) 
        {
        self->InvokeEvent(vtkCommand::LeftButtonPressEvent,NULL);
        }
      else
        {
        self->OnLeftButtonDown();
        }
      break;

    case vtkCommand::LeftButtonReleaseEvent:
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::LeftButtonReleaseEvent)) 
        {
        self->InvokeEvent(vtkCommand::LeftButtonReleaseEvent,NULL);
        }
      else 
        {
        self->OnLeftButtonUp();
        }
      break;

    case vtkCommand::MiddleButtonPressEvent:
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::MiddleButtonPressEvent)) 
        {
        self->InvokeEvent(vtkCommand::MiddleButtonPressEvent,NULL);
        }
      else 
        {
        self->OnMiddleButtonDown();
        }
      break;

    case vtkCommand::MiddleButtonReleaseEvent:
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::MiddleButtonReleaseEvent)) 
        {
        self->InvokeEvent(vtkCommand::MiddleButtonReleaseEvent,NULL);
        }
      else 
        {
        self->OnMiddleButtonUp();
        }
      break;

    case vtkCommand::RightButtonPressEvent:
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::RightButtonPressEvent)) 
        {
        self->InvokeEvent(vtkCommand::RightButtonPressEvent,NULL);
        }
      else 
        {
        self->OnRightButtonDown();
        }
      break;

    case vtkCommand::RightButtonReleaseEvent: 
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::RightButtonReleaseEvent)) 
        {
        self->InvokeEvent(vtkCommand::RightButtonReleaseEvent,NULL);
        }
      else 
        {
        self->OnRightButtonUp();
        }
      break;

    case vtkCommand::MouseWheelForwardEvent:
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::MouseWheelForwardEvent)) 
        {
        self->InvokeEvent(vtkCommand::MouseWheelForwardEvent,NULL);
        }
      else 
        {
        self->OnMouseWheelForward();
        }
      break;

    case vtkCommand::MouseWheelBackwardEvent: 
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::MouseWheelBackwardEvent)) 
        {
        self->InvokeEvent(vtkCommand::MouseWheelBackwardEvent,NULL);
        }
      else 
        {
        self->OnMouseWheelBackward();
        }
      break;

    case vtkCommand::KeyPressEvent:
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::KeyPressEvent)) 
        {
        self->InvokeEvent(vtkCommand::KeyPressEvent,NULL);
        }
      else 
        {
        self->OnKeyDown();
        self->OnKeyPress();
        }
      break;

    case vtkCommand::KeyReleaseEvent: 
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::KeyReleaseEvent)) 
        {
        self->InvokeEvent(vtkCommand::KeyReleaseEvent,NULL);
        }
      else 
        {
        self->OnKeyUp();
        self->OnKeyRelease(); 
        }
      break;

    case vtkCommand::CharEvent:  
      if (self->HandleObservers && 
          self->HasObserver(vtkCommand::CharEvent)) 
        {
        self->InvokeEvent(vtkCommand::CharEvent,NULL);
        }
      else 
        {
        self->OnChar();
        }
      break;

    case vtkCommand::DeleteEvent:
      self->SetInteractor(0);
      break;
    }
}

