#ifndef cmGrFltk_h
#define cmGrFltk_h

class Fl_Group;
class Fl_Output;
class Fl_Scrollbar;

class cmGrDevDrvFltk
{
 public:

  cmGrDevDrvFltk();
  virtual ~cmGrDevDrvFltk(){}


  static bool     create( void* user, unsigned w, unsigned h );
  static void     destroy( void* user );

  static void     begin_draw( void* arg );
  static void     end_draw(   void* arg );
  static void     draw(       void* arg, int x, int y );

  static void     set_color( void* user, const cmGrColor_t  c );  
  static void     get_color( void* user,       cmGrColor_t* c );  

  static void     set_font_family( void* user, unsigned fontId );
  static unsigned get_font_family( void* user );

  static void     set_font_style( void* user, unsigned style );
  static unsigned get_font_style( void* user );

  static void     set_font_size( void* user, unsigned size );
  static unsigned get_font_size( void* user );

  static void     set_pen_style( void* user, unsigned styleFlags );
  static unsigned get_pen_style( void* user );

  static void     set_pen_width( void* user, unsigned w );  
  static unsigned get_pen_width( void* user );

  static void draw_line(     void* user, int x0, int y0, int x1, int y1 );
  static void draw_rect(     void* user, int x0, int y0, unsigned w, unsigned h );
  static void fill_rect(     void* user, int x0, int y0, unsigned w, unsigned h );
  static void draw_ellipse(  void* user, int x0, int y0, unsigned w, unsigned h );
  static void fill_ellipse(  void* user, int x0, int y0, unsigned w, unsigned h );
  static void draw_diamond(  void* user, int x0, int y0, unsigned w, unsigned h );
  static void fill_diamond(  void* user, int x0, int y0, unsigned w, unsigned h );
  static void draw_triangle( void* user, int x0, int y0, unsigned w, unsigned h, unsigned dirFlag );
  static void fill_triangle( void* user, int x0, int y0, unsigned w, unsigned h, unsigned dirFlag );

  static void draw_text(     void* user, const char* text, int x, int y );
  static void draw_text_rot( void* user, const char* text, int x, int y, int angle );
  static void measure_text(  void* user, const char* text, unsigned* w, unsigned* h );

  static void read_image( void* user,       unsigned char* p, int x, int y, unsigned w, unsigned h );
  static void draw_image( void* user, const unsigned char* p, int x, int y, unsigned w, unsigned h );

  bool is_initialized() const;

  cmGrDev_t    d;

 private:  

  unsigned _fltk_pen_width;
  unsigned _fltk_pen_style; 
  unsigned _fltk_font_size;
  unsigned _w;
  unsigned _h;

  static void _get_font_family_style(             unsigned* fontId, unsigned* style );
  static void _set_font_family_style( void* user, unsigned  fontId, unsigned  style );
};

//--------------------------------------------------------------------------------------
// Canvas Object 

class cmGrViewFltk : public Fl_Widget
{
 public:
  cmGrViewFltk( cmCtx_t* ctx, cmGrH_t grH, int x, int y, int w, int h );
  virtual ~cmGrViewFltk();

  virtual int  handle(int event);
  virtual void resize(int x, int y, int w, int h );
          void setGrH( cmGrH_t grH );

 private:
  virtual void draw();

  typedef struct 
  {
    unsigned idx;
    unsigned fltk_code;
    char     ch;
    cmGrKeyCodeId_t gr_code;
  } keyMap_t;

  cmGrH_t         _grH;
  cmGrDevDrvFltk  _dd;
  cmGrDcH_t       _dcH;
  static keyMap_t _keymap[];

  const keyMap_t* _getGrKeyCode( unsigned fltk_code );
  cmGrKeyCodeId_t _eventKeyCode( );

};


//--------------------------------------------------------------------------------------
// Container for multiple plots

class cmGrPageFltk : public Fl_Group 
{
 public:
  cmGrPageFltk( cmCtx_t* ctx, cmGrPgH_t pgH,  int x, int y, int w, int h );
  virtual ~cmGrPageFltk();
  
  virtual void             createView( unsigned vwIdx );

  virtual void             destroyView( unsigned vwIdx );

  virtual cmGrDcH_t        devCtxHandle();

  virtual cmGrViewFltk*   viewWidget( unsigned vwIdx );

  virtual void resize(int x, int y, int w, int h );
  
 private:
  virtual void draw();

  cmGrDevDrvFltk _dd;
  cmCtx_t*       _ctx;
  cmGrPgH_t      _pgH;
  cmGrDcH_t      _dcH;
  cmGrViewFltk** _vwV;
  unsigned       _vwN;
  
};

//--------------------------------------------------------------------------------------
// Contains a single cmGrPageFltk and a control panel

class cmGrPlotFltk : public Fl_Group
{
 public:
  cmGrPlotFltk( cmCtx_t* ctx, int x, int y, int w, int h, int rn=1, int cn=1, int textSz=10 );
  virtual ~cmGrPlotFltk();

  virtual void resize(int x, int y, int w, int h );

  cmGrPgH_t pageHandle();
  cmGrPlH_t plotHandle();
  cmGrDcH_t dcHandle();

  virtual void initViews( int rn, int cn );
  virtual void setStatusText( const cmChar_t* s );
  
  virtual void on_button( unsigned id );
  virtual void on_scroll( Fl_Scrollbar* sb, unsigned id );
  virtual void on_view_create(   unsigned viewIdx );
  virtual void on_view_destroy(  unsigned viewIdx );
  virtual void rpt_local_pt(     cmGrH_t grH );
  virtual void rpt_global_pt(    cmGrH_t grH );
  virtual void on_phys_change(   cmGrH_t grH );
  virtual void on_view_change(   cmGrH_t grH );
  virtual void on_select_change( cmGrH_t grH );
  virtual void on_focused_plot(  cmGrH_t grH );
  virtual void on_key_event(     cmGrH_t grH, unsigned eventFlags, cmGrKeyCodeId_t keycode );
  virtual bool on_plot_object(   cmGrPlotCbArg_t* arg );

 private:
  enum
  {
    kHBord = 0,     // dist between vertical elements (cols)
    kVBord = 0,     // dist between horz elements (rows)
    kBtnH  = 20,    // control height
    kBtnW  = 50,    // button width
    kOutW  = 100,   // output width
    kLblW  = 20,    // output label width,
    kScrD  = 20     // scroll bar thickness
  };

  enum
  {
    kHScrollId,
    kVScrollId,
    kShowAllId,
    kReportId,
    kZoomInId,
    kZoomOutId,
    kZoomInXId,
    kZoomInYId,
    kZoomOutXId,
    kZoomOutYId,
  };


  cmGrPgH_t      _pgH;
  cmGrPlH_t      _plH;
  
  cmGrPageFltk* _pg;
  Fl_Group*     _ctl_grp;
  Fl_Group*     _usr_grp;
  Fl_Output*    _status;        // status text output
 
  Fl_Scrollbar* _hsb;           // scroll bars
  Fl_Scrollbar* _vsb;

  Fl_Output*    _gx;            // current global coord display
  Fl_Output*    _gy;

  Fl_Output*    _lx;            // current local coord display
  Fl_Output*    _ly;

  Fl_Output*    _s0x;           // seletion point
  Fl_Output*    _s0y;
  Fl_Output*    _s1x;  
  Fl_Output*    _s1y;
  Fl_Output*    _sdx;
  Fl_Output*    _sdy;
 
  int            _textSz;

  void      _layout();
  Fl_Group* _create_ctls();
  void      _create_scroll_bars();
  void      _showHideScrollBars();
  cmGrH_t   _getFocusedView();

  // controls callback
  static void _s_ctl_cb(Fl_Widget* w, long id );

  // plot page callbacks
  static void _s_cmGrCallback( void* arg, cmGrH_t grH, cmGrCbId_t id, unsigned eventFlags, cmGrKeyCodeId_t keycode );

  // plot object callbacks
  static bool _s_cmGrPlotObjCbFunc( cmGrPlotCbArg_t* arg );
  
};


#endif