Fl_Help_View.H

//
// Help Viewer widget definitions.
//
// Copyright 1997-2010 by Easy Software Products.
// Image support by Matthias Melcher, Copyright 2000-2009.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file.  If this
// file is missing or damaged, see the license at:
//
//     https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
//     https://www.fltk.org/bugs.php
//

/* \file
   Fl_Help_View widget . */

#ifndef Fl_Help_View_H
#define Fl_Help_View_H

//
// Include necessary header files...
//

#include "Fl.H"
#include "Fl_Group.H"
#include "Fl_Scrollbar.H"
#include "fl_draw.H"
#include "filename.H"

class Fl_Shared_Image;
//
// Fl_Help_Func type - link callback function for files...
//

typedef const char *(Fl_Help_Func)(Fl_Widget *, const char *);

//
// Fl_Help_Block structure...
//

struct Fl_Help_Block {
  const char    *start,         // Start of text
                *end;           // End of text
  uchar         border;         // Draw border?
  Fl_Color      bgcolor;        // Background color
  int           x,              // Indentation/starting X coordinate
                y,              // Starting Y coordinate
                w,              // Width
                h;              // Height
  int           line[32];       // Left starting position for each line
};

//
// Fl_Help_Link structure...
//
struct Fl_Help_Link {
  char          filename[192],  
                name[32];       
  int           x,              
                y,              
                w,              
                h;              
};

/*
 * Fl_Help_View font stack opaque implementation
 */

struct FL_EXPORT Fl_Help_Font_Style {
  Fl_Font      f;  
  Fl_Fontsize  s;  
  Fl_Color     c;  
  void get(Fl_Font &afont, Fl_Fontsize &asize, Fl_Color &acolor) {afont=f; asize=s; acolor=c;} 
  void set(Fl_Font afont, Fl_Fontsize asize, Fl_Color acolor) {f=afont; s=asize; c=acolor;} 
  Fl_Help_Font_Style(Fl_Font afont, Fl_Fontsize asize, Fl_Color acolor) {set(afont, asize, acolor);}
  Fl_Help_Font_Style(){} // For in table use
};

const size_t MAX_FL_HELP_FS_ELTS = 100;

struct FL_EXPORT Fl_Help_Font_Stack {
  Fl_Help_Font_Stack() {
    nfonts_ = 0;
  }

  void init(Fl_Font f, Fl_Fontsize s, Fl_Color c) {
    nfonts_ = 0;
    elts_[nfonts_].set(f, s, c);
    fl_font(f, s);
    fl_color(c);
  }
  void top(Fl_Font &f, Fl_Fontsize &s, Fl_Color &c) { elts_[nfonts_].get(f, s, c); }
  void push(Fl_Font f, Fl_Fontsize s, Fl_Color c) {
    if (nfonts_ <  MAX_FL_HELP_FS_ELTS-1) nfonts_ ++;
    elts_[nfonts_].set(f, s, c);
    fl_font(f, s); fl_color(c);
  }
  void pop(Fl_Font &f, Fl_Fontsize &s, Fl_Color &c) {
    if (nfonts_ > 0) nfonts_ --;
    top(f, s, c);
    fl_font(f, s); fl_color(c);
  }
  size_t count() const {return nfonts_;} // Gets the current number of fonts in the stack

protected:
  size_t nfonts_;               
  Fl_Help_Font_Style elts_[MAX_FL_HELP_FS_ELTS]; 
};

struct Fl_Help_Target {
  char          name[32];       
  int           y;              
};

class FL_EXPORT Fl_Help_View : public Fl_Group {        // Help viewer widget

  enum { RIGHT = -1, CENTER, LEFT };    

  char          title_[1024];           
  Fl_Color      defcolor_,              
                bgcolor_,               
                textcolor_,             
                linkcolor_;             
  Fl_Font       textfont_;              
  Fl_Fontsize  textsize_;               
  const char    *value_;                
  Fl_Help_Font_Stack fstack_;           
  int           nblocks_,               
                ablocks_;               
  Fl_Help_Block *blocks_;               

  Fl_Help_Func  *link_;                 

  int           nlinks_,                
                alinks_;                
  Fl_Help_Link  *links_;                

  int           ntargets_,              
                atargets_;              
  Fl_Help_Target *targets_;             

  char          directory_[FL_PATH_MAX];
  char          filename_[FL_PATH_MAX]; 
  int           topline_,               
                leftline_,              
                size_,                  
                hsize_,                 
                scrollbar_size_;        
  Fl_Scrollbar  scrollbar_,             
                hscrollbar_;            

  static int    selection_first;
  static int    selection_last;
  static int    selection_push_first;
  static int    selection_push_last;
  static int    selection_drag_first;
  static int    selection_drag_last;
  static int    selected;
  static int    draw_mode;
  static int    mouse_x;
  static int    mouse_y;
  static int    current_pos;
  static Fl_Help_View *current_view;
  static Fl_Color hv_selection_color;
  static Fl_Color hv_selection_text_color;


  void initfont(Fl_Font &f, Fl_Fontsize &s, Fl_Color &c) { f = textfont_; s = textsize_; c = textcolor_; fstack_.init(f, s, c); }
  void pushfont(Fl_Font f, Fl_Fontsize s) {fstack_.push(f, s, textcolor_);}
  void pushfont(Fl_Font f, Fl_Fontsize s, Fl_Color c) {fstack_.push(f, s, c);}
  void popfont(Fl_Font &f, Fl_Fontsize &s, Fl_Color &c) {fstack_.pop(f, s, c);}

  Fl_Help_Block *add_block(const char *s, int xx, int yy, int ww, int hh, uchar border = 0);
  void          add_link(const char *n, int xx, int yy, int ww, int hh);
  void          add_target(const char *n, int yy);
  static int    compare_targets(const Fl_Help_Target *t0, const Fl_Help_Target *t1);
  int           do_align(Fl_Help_Block *block, int line, int xx, int a, int &l);
protected:
  void          draw();
private:
  void          format();
  void          format_table(int *table_width, int *columns, const char *table);
  void          free_data();
  int           get_align(const char *p, int a);
  const char    *get_attr(const char *p, const char *n, char *buf, int bufsize);
  Fl_Color      get_color(const char *n, Fl_Color c);
  Fl_Shared_Image *get_image(const char *name, int W, int H);
  int           get_length(const char *l);
public:
  int           handle(int);
private:

  void          hv_draw(const char *t, int x, int y, int entity_extra_length = 0);
  char          begin_selection();
  char          extend_selection();
  void          end_selection(int c=0);
  void          clear_global_selection();
  Fl_Help_Link  *find_link(int, int);
  void          follow_link(Fl_Help_Link*);

public:

  Fl_Help_View(int xx, int yy, int ww, int hh, const char *l = 0);
  ~Fl_Help_View();
  const char    *directory() const { if (directory_[0]) return (directory_);
                                        else return ((const char *)0); }
  const char    *filename() const { if (filename_[0]) return (filename_);
                                        else return ((const char *)0); }
  int           find(const char *s, int p = 0);
  void          link(Fl_Help_Func *fn) { link_ = fn; }
  int           load(const char *f);
  void          resize(int,int,int,int);
  int           size() const { return (size_); }
  void          size(int W, int H) { Fl_Widget::size(W, H); }
  void          textcolor(Fl_Color c) { if (textcolor_ == defcolor_) textcolor_ = c; defcolor_ = c; }
  Fl_Color      textcolor() const { return (defcolor_); }
  void          textfont(Fl_Font f) { textfont_ = f; format(); }
  Fl_Font       textfont() const { return (textfont_); }
  void          textsize(Fl_Fontsize s) { textsize_ = s; format(); }
  Fl_Fontsize  textsize() const { return (textsize_); }
  const char    *title() { return (title_); }
  void          topline(const char *n);
  void          topline(int);
  int           topline() const { return (topline_); }
  void          leftline(int);
  int           leftline() const { return (leftline_); }
  void          value(const char *val);
  const char    *value() const { return (value_); }
  void          clear_selection();
  void          select_all();
  int scrollbar_size() const {
      return(scrollbar_size_);
  }
  void scrollbar_size(int newSize) {
      scrollbar_size_ = newSize;
  }
};

#endif // !Fl_Help_View_H