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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkWin32RenderWindowInteractor.h,v $

  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.

=========================================================================*/
// .NAME vtkWin32RenderWindowInteractor - implements Win32 specific functions
// required by vtkRenderWindowInteractor.
//
// .SECTION Description
// By default the interactor installs a MessageProc callback which
// intercepts windows' messages to the window and controls interactions by
// routing them to the InteractoStyle classes.
// MFC or BCB programs can prevent this and instead directly route any mouse/key
// messages into the event bindings by setting InstallMessageProc to false.
// This provides a minimal "Mapped" mode of interaction
//
#ifndef __vtkWin32RenderWindowInteractor_h
#define __vtkWin32RenderWindowInteractor_h

#include "vtkRenderWindowInteractor.h"
#include "vtkWindows.h" // For windows API.

class VTK_RENDERING_EXPORT vtkWin32RenderWindowInteractor : public vtkRenderWindowInteractor 
{
public:
  // Description:
  // Construct object so that light follows camera motion.
  static vtkWin32RenderWindowInteractor *New();

  vtkTypeRevisionMacro(vtkWin32RenderWindowInteractor,vtkRenderWindowInteractor);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Initialize the event handler
  virtual void Initialize();

  // Description:
  // Enable/Disable interactions.  By default interactors are enabled when
  // initialized.  Initialize() must be called prior to enabling/disabling
  // interaction. These methods are used when a window/widget is being
  // shared by multiple renderers and interactors.  This allows a "modal"
  // display where one interactor is active when its data is to be displayed
  // and all other interactors associated with the widget are disabled
  // when their data is not displayed.
  virtual void Enable();
  virtual void Disable();

  // Description:
  // This will start up the event loop and never return. If you
  // call this method it will loop processing events until the
  // application is exited.
  virtual void Start();

  // Description:
  // By default the interactor installs a MessageProc callback which
  // intercepts windows messages to the window and controls interactions.
  // MFC or BCB programs can prevent this and instead directly route any mouse/key
  // messages into the event bindings by setting InstallMessgeProc to false.
  vtkSetMacro(InstallMessageProc,int);
  vtkGetMacro(InstallMessageProc,int);
  vtkBooleanMacro(InstallMessageProc,int);

  // Description:
  // Win32 specific application terminate, calls ClassExitMethod then
  // calls PostQuitMessage(0) to terminate the application. An application can Specify
  // ExitMethod for alternative behavior (i.e. suppression of keyboard exit)
  void TerminateApp(void);

  // Description:
  // Win32 timer methods
  int CreateTimer(int timertype);
  int DestroyTimer(void);

  //BTX
  friend VTK_RENDERING_EXPORT LRESULT CALLBACK vtkHandleMessage(HWND hwnd,UINT uMsg, WPARAM w, LPARAM l);
  friend VTK_RENDERING_EXPORT LRESULT CALLBACK vtkHandleMessage2(HWND hwnd,UINT uMsg, WPARAM w, LPARAM l, vtkWin32RenderWindowInteractor *me);

  // Description:
  // Various methods that a Win32 window can redirect to this class to be 
  // handled.
  virtual void OnMouseMove  (HWND wnd, UINT nFlags, int X, int Y);
  virtual void OnNCMouseMove(HWND wnd, UINT nFlags, int X, int Y);
  virtual void OnRButtonDown(HWND wnd, UINT nFlags, int X, int Y, int repeat=0);
  virtual void OnRButtonUp  (HWND wnd, UINT nFlags, int X, int Y);
  virtual void OnMButtonDown(HWND wnd, UINT nFlags, int X, int Y, int repeat=0);
  virtual void OnMButtonUp  (HWND wnd, UINT nFlags, int X, int Y);
  virtual void OnLButtonDown(HWND wnd, UINT nFlags, int X, int Y, int repeat=0);
  virtual void OnLButtonUp  (HWND wnd, UINT nFlags, int X, int Y);
  virtual void OnSize       (HWND wnd, UINT nType,  int X, int Y);
  virtual void OnTimer      (HWND wnd, UINT nIDEvent);
  virtual void OnKeyDown    (HWND wnd, UINT nChar, UINT nRepCnt, UINT nFlags);
  virtual void OnKeyUp      (HWND wnd, UINT nChar, UINT nRepCnt, UINT nFlags);
  virtual void OnChar       (HWND wnd, UINT nChar, UINT nRepCnt, UINT nFlags);
  virtual void OnMouseWheelForward (HWND wnd, UINT nFlags, int X, int Y);
  virtual void OnMouseWheelBackward(HWND wnd, UINT nFlags, int X, int Y);
  //ETX

  // Description:
  // Methods to set the default exit method for the class. This method is
  // only used if no instance level ExitMethod has been defined.  It is
  // provided as a means to control how an interactor is exited given
  // the various language bindings (tcl, Win32, etc.).
  static void SetClassExitMethod(void (*f)(void *), void *arg);
  static void SetClassExitMethodArgDelete(void (*f)(void *));

  // Description:
  // These methods correspond to the the Exit, User and Pick
  // callbacks. They allow for the Style to invoke them.
  virtual void ExitCallback();

protected:
  vtkWin32RenderWindowInteractor();
  ~vtkWin32RenderWindowInteractor();

  HWND    WindowId;
  UINT    TimerId;
  WNDPROC OldProc;
  int     InstallMessageProc;

  int     MouseInWindow;

  //BTX
  // Description:
  // Class variables so an exit method can be defined for this class
  // (used to set different exit methods for various language bindings,
  // i.e. tcl, java, Win32)
  static void (*ClassExitMethod)(void *);
  static void (*ClassExitMethodArgDelete)(void *);
  static void *ClassExitMethodArg;
  //ETX

private:
  vtkWin32RenderWindowInteractor(const vtkWin32RenderWindowInteractor&);  // Not implemented.
  void operator=(const vtkWin32RenderWindowInteractor&);  // Not implemented.
};

#endif