mirrors
/
fltk
mirror of https://github.com/fltk/fltk
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity
fltk/FL/Fl_Help_View.H

382 lines
14 KiB
C++
Raw Blame History

//
// 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...
//
/** Definition of a link for the html viewer. */
struct Fl_Help_Link {
char filename[192], ///< Reference filename
name[32]; ///< Link target (blank if none)
int x, ///< X offset of link text
y, ///< Y offset of link text
w, ///< Width of link text
h; ///< Height of link text
};
/*
* Fl_Help_View font stack opaque implementation
*/
/** Fl_Help_View font stack element definition. */
struct FL_EXPORT Fl_Help_Font_Style {
Fl_Font f; ///< Font
Fl_Fontsize s; ///< Font Size
Fl_Color c; ///< Font Color
void get(Fl_Font &afont, Fl_Fontsize &asize, Fl_Color &acolor) {afont=f; asize=s; acolor=c;} ///< Gets current font attributes
void set(Fl_Font afont, Fl_Fontsize asize, Fl_Color acolor) {f=afont; s=asize; c=acolor;} ///< Sets current font attributes
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
};
/** Fl_Help_View font stack definition. */
const size_t MAX_FL_HELP_FS_ELTS = 100;
struct FL_EXPORT Fl_Help_Font_Stack {
/** font stack construction, initialize attributes. */
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);
}
/** Gets the top (current) element on the stack. */
void top(Fl_Font &f, Fl_Fontsize &s, Fl_Color &c) { elts_[nfonts_].get(f, s, c); }
/** Pushes the font style triplet on the stack, also calls fl_font() & fl_color() adequately */
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);
}
/** Pops from the stack the font style triplet and calls fl_font() & fl_color() adequately */
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);
}
/** Gets the current count of font style elements in the stack. */
size_t count() const {return nfonts_;} // Gets the current number of fonts in the stack
protected:
size_t nfonts_; ///< current number of fonts in stack
Fl_Help_Font_Style elts_[MAX_FL_HELP_FS_ELTS]; ///< font elements
};
/** Fl_Help_Target structure */
struct Fl_Help_Target {
char name[32]; ///< Target name
int y; ///< Y offset of target
};
/**
The Fl_Help_View widget displays HTML text. Most HTML 2.0
elements are supported, as well as a primitive implementation of tables.
GIF, JPEG, and PNG images are displayed inline.
Supported HTML tags:
- A: HREF/NAME
- B
- BODY: BGCOLOR/TEXT/LINK
- BR
- CENTER
- CODE
- DD
- DL
- DT
- EM
- FONT: COLOR/SIZE/FACE=(helvetica/arial/sans/times/serif/symbol/courier)
- H1/H2/H3/H4/H5/H6
- HEAD
- HR
- I
- IMG: SRC/WIDTH/HEIGHT/ALT
- KBD
- LI
- OL
- P
- PRE
- STRONG
- TABLE: TH/TD/TR/BORDER/BGCOLOR/COLSPAN/ALIGN=CENTER|RIGHT|LEFT
- TITLE
- TT
- U
- UL
- VAR
Supported color names:
- black,red,green,yellow,blue,magenta,fuchsia,cyan,aqua,white,gray,grey,lime,maroon,navy,olive,purple,silver,teal.
Supported urls:
- Internal: file:
- External: http: ftp: https: ipp: mailto: news:
Quoted char names:
- Aacute aacute Acirc acirc acute AElig aelig Agrave agrave amp Aring aring Atilde atilde Auml auml
- brvbar bull
- Ccedil ccedil cedil cent copy curren
- dagger deg divide
- Eacute eacute Ecirc ecirc Egrave egrave ETH eth Euml euml euro
- frac12 frac14 frac34
- gt
- Iacute iacute Icirc icirc iexcl Igrave igrave iquest Iuml iuml
- laquo lt
- macr micro middot
- nbsp not Ntilde ntilde
- Oacute oacute Ocirc ocirc Ograve ograve ordf ordm Oslash oslash Otilde otilde Ouml ouml
- para permil plusmn pound
- quot
- raquo reg
- sect shy sup1 sup2 sup3 szlig
- THORN thorn times trade
- Uacute uacute Ucirc ucirc Ugrave ugrave uml Uuml uuml
- Yacute yacute
- yen Yuml yuml
*/
class FL_EXPORT Fl_Help_View : public Fl_Group { // Help viewer widget
enum { RIGHT = -1, CENTER, LEFT }; ///< Alignments
char title_[1024]; ///< Title string
Fl_Color defcolor_, ///< Default text color
bgcolor_, ///< Background color
textcolor_, ///< Text color
linkcolor_; ///< Link color
Fl_Font textfont_; ///< Default font for text
Fl_Fontsize textsize_; ///< Default font size
const char *value_; ///< HTML text value
Fl_Help_Font_Stack fstack_; ///< font stack management
int nblocks_, ///< Number of blocks/paragraphs
ablocks_; ///< Allocated blocks
Fl_Help_Block *blocks_; ///< Blocks
Fl_Help_Func *link_; ///< Link transform function
int nlinks_, ///< Number of links
alinks_; ///< Allocated links
Fl_Help_Link *links_; ///< Links
int ntargets_, ///< Number of targets
atargets_; ///< Allocated targets
Fl_Help_Target *targets_; ///< Targets
char directory_[FL_PATH_MAX];///< Directory for current file
char filename_[FL_PATH_MAX]; ///< Current filename
int topline_, ///< Top line in document
leftline_, ///< Lefthand position
size_, ///< Total document length
hsize_, ///< Maximum document width
scrollbar_size_; ///< Size for both scrollbars
Fl_Scrollbar scrollbar_, ///< Vertical scrollbar for document
hscrollbar_; ///< Horizontal scrollbar
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();
/** Returns the current directory for the text in the buffer. */
const char *directory() const { if (directory_[0]) return (directory_);
else return ((const char *)0); }
/** Returns the current filename for the text in the buffer. */
const char *filename() const { if (filename_[0]) return (filename_);
else return ((const char *)0); }
int find(const char *s, int p = 0);
/**
This method assigns a callback function to use when a link is
followed or a file is loaded (via Fl_Help_View::load()) that
requires a different file or path.
The callback function receives a pointer to the Fl_Help_View
widget and the URI or full pathname for the file in question.
It must return a pathname that can be opened as a local file or NULL:
\code
const char *fn(Fl_Widget *w, const char *uri);
\endcode
The link function can be used to retrieve remote or virtual
documents, returning a temporary file that contains the actual
data. If the link function returns NULL, the value of
the Fl_Help_View widget will remain unchanged.
If the link callback cannot handle the URI scheme, it should
return the uri value unchanged or set the value() of the widget
before returning NULL.
*/
void link(Fl_Help_Func *fn) { link_ = fn; }
int load(const char *f);
void resize(int,int,int,int);
/** Gets the size of the help view. */
int size() const { return (size_); }
void size(int W, int H) { Fl_Widget::size(W, H); }
/** Sets the default text color. */
void textcolor(Fl_Color c) { if (textcolor_ == defcolor_) textcolor_ = c; defcolor_ = c; }
/** Returns the current default text color. */
Fl_Color textcolor() const { return (defcolor_); }
/** Sets the default text font. */
void textfont(Fl_Font f) { textfont_ = f; format(); }
/** Returns the current default text font. */
Fl_Font textfont() const { return (textfont_); }
/** Sets the default text size. */
void textsize(Fl_Fontsize s) { textsize_ = s; format(); }
/** Gets the default text size. */
Fl_Fontsize textsize() const { return (textsize_); }
/** Returns the current document title, or NULL if there is no title. */
const char *title() { return (title_); }
void topline(const char *n);
void topline(int);
/** Returns the current top line in pixels. */
int topline() const { return (topline_); }
void leftline(int);
/** Gets the left position in pixels. */
int leftline() const { return (leftline_); }
void value(const char *val);
/** Returns the current buffer contents. */
const char *value() const { return (value_); }
void clear_selection();
void select_all();
/**
Gets the current size of the scrollbars' troughs, in pixels.
If this value is zero (default), this widget will use the
Fl::scrollbar_size() value as the scrollbar's width.
\returns Scrollbar size in pixels, or 0 if the global Fl::scrollbar_size() is being used.
\see Fl::scrollbar_size(int)
*/
int scrollbar_size() const {
return(scrollbar_size_);
}
/**
Sets the pixel size of the scrollbars' troughs to \p newSize, in pixels.
Normally you should not need this method, and should use
Fl::scrollbar_size(int) instead to manage the size of ALL
your widgets' scrollbars. This ensures your application
has a consistent UI, is the default behavior, and is normally
what you want.
Only use THIS method if you really need to override the global
scrollbar size. The need for this should be rare.
Setting \p newSize to the special value of 0 causes the widget to
track the global Fl::scrollbar_size(), which is the default.
\param[in] newSize Sets the scrollbar size in pixels.\n
If 0 (default), scrollbar size tracks the global Fl::scrollbar_size()
\see Fl::scrollbar_size()
*/
void scrollbar_size(int newSize) {
scrollbar_size_ = newSize;
}
};
#endif // !Fl_Help_View_H
Reference in New Issue View Git Blame Copy Permalink