mirror of https://github.com/fltk/fltk
389 lines
14 KiB
C++
389 lines
14 KiB
C++
//
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// Help Viewer widget definitions.
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//
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// Copyright 1997-2010 by Easy Software Products.
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// Image support by Matthias Melcher, Copyright 2000-2009.
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// Copyright 2011-2022 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// https://www.fltk.org/COPYING.php
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//
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// Please see the following page on how to report bugs and issues:
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//
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// https://www.fltk.org/bugs.php
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//
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/* \file
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Fl_Help_View widget . */
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#ifndef Fl_Help_View_H
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#define Fl_Help_View_H
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//
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// Include necessary header files...
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//
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#include "Fl.H"
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#include "Fl_Group.H"
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#include "Fl_Scrollbar.H"
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#include "fl_draw.H"
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#include "filename.H"
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class Fl_Shared_Image;
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//
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// Fl_Help_Func type - link callback function for files...
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//
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typedef const char *(Fl_Help_Func)(Fl_Widget *, const char *);
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//
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// Fl_Help_Block structure...
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//
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struct Fl_Help_Block {
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const char *start, // Start of text
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*end; // End of text
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uchar border; // Draw border?
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Fl_Color bgcolor; // Background color
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int x, // Indentation/starting X coordinate
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y, // Starting Y coordinate
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w, // Width
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h; // Height
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int line[32]; // Left starting position for each line
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int ol; // is ordered list <OL> element
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int ol_num; // item number in ordered list
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};
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//
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// Fl_Help_Link structure...
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//
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/** Definition of a link for the html viewer. */
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struct Fl_Help_Link {
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char filename[192], ///< Reference filename
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name[32]; ///< Link target (blank if none)
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int x, ///< X offset of link text
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y, ///< Y offset of link text
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w, ///< Width of link text
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h; ///< Height of link text
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};
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/*
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* Fl_Help_View font stack opaque implementation
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*/
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/** Fl_Help_View font stack element definition. */
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struct FL_EXPORT Fl_Help_Font_Style {
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Fl_Font f; ///< Font
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Fl_Fontsize s; ///< Font Size
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Fl_Color c; ///< Font Color
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void get(Fl_Font &afont, Fl_Fontsize &asize, Fl_Color &acolor) {afont=f; asize=s; acolor=c;} ///< Gets current font attributes
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void set(Fl_Font afont, Fl_Fontsize asize, Fl_Color acolor) {f=afont; s=asize; c=acolor;} ///< Sets current font attributes
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Fl_Help_Font_Style(Fl_Font afont, Fl_Fontsize asize, Fl_Color acolor) {set(afont, asize, acolor);}
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Fl_Help_Font_Style(){} // For in table use
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};
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/** Fl_Help_View font stack definition. */
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const size_t MAX_FL_HELP_FS_ELTS = 100;
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struct FL_EXPORT Fl_Help_Font_Stack {
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/** font stack construction, initialize attributes. */
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Fl_Help_Font_Stack() {
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nfonts_ = 0;
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}
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void init(Fl_Font f, Fl_Fontsize s, Fl_Color c) {
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nfonts_ = 0;
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elts_[nfonts_].set(f, s, c);
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fl_font(f, s);
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fl_color(c);
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}
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/** Gets the top (current) element on the stack. */
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void top(Fl_Font &f, Fl_Fontsize &s, Fl_Color &c) { elts_[nfonts_].get(f, s, c); }
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/** Pushes the font style triplet on the stack, also calls fl_font() & fl_color() adequately */
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void push(Fl_Font f, Fl_Fontsize s, Fl_Color c) {
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if (nfonts_ < MAX_FL_HELP_FS_ELTS-1) nfonts_ ++;
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elts_[nfonts_].set(f, s, c);
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fl_font(f, s); fl_color(c);
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}
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/** Pops from the stack the font style triplet and calls fl_font() & fl_color() adequately */
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void pop(Fl_Font &f, Fl_Fontsize &s, Fl_Color &c) {
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if (nfonts_ > 0) nfonts_ --;
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top(f, s, c);
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fl_font(f, s); fl_color(c);
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}
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/** Gets the current count of font style elements in the stack. */
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size_t count() const {return nfonts_;} // Gets the current number of fonts in the stack
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protected:
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size_t nfonts_; ///< current number of fonts in stack
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Fl_Help_Font_Style elts_[MAX_FL_HELP_FS_ELTS]; ///< font elements
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};
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/** Fl_Help_Target structure */
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struct Fl_Help_Target {
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char name[32]; ///< Target name
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int y; ///< Y offset of target
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};
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/**
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The Fl_Help_View widget displays HTML text. Most HTML 2.0
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elements are supported, as well as a primitive implementation of tables.
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GIF, JPEG, and PNG images are displayed inline.
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Supported HTML tags:
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- A: HREF/NAME
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- B
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- BODY: BGCOLOR/TEXT/LINK
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- BR
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- CENTER
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- CODE
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- DD
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- DL
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- DT
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- EM
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- FONT: COLOR/SIZE/FACE=(helvetica/arial/sans/times/serif/symbol/courier)
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- H1/H2/H3/H4/H5/H6
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- HEAD
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- HR
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- I
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- IMG: SRC/WIDTH/HEIGHT/ALT
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- KBD
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- LI
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- OL
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- P
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- PRE
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- STRONG
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- TABLE: TH/TD/TR/BORDER/BGCOLOR/COLSPAN/ALIGN=CENTER|RIGHT|LEFT
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- TITLE
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- TT
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- U
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- UL
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- VAR
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Supported color names:
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- black,red,green,yellow,blue,magenta,fuchsia,cyan,aqua,white,gray,grey,lime,maroon,navy,olive,purple,silver,teal.
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Supported urls:
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- Internal: file:
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- External: http: ftp: https: ipp: mailto: news:
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Quoted char names:
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- Aacute aacute Acirc acirc acute AElig aelig Agrave agrave amp Aring aring Atilde atilde Auml auml
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- brvbar bull
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- Ccedil ccedil cedil cent copy curren
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- dagger deg divide
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- Eacute eacute Ecirc ecirc Egrave egrave ETH eth Euml euml euro
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- frac12 frac14 frac34
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- gt
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- Iacute iacute Icirc icirc iexcl Igrave igrave iquest Iuml iuml
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- laquo lt
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- macr micro middot
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- nbsp not Ntilde ntilde
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- Oacute oacute Ocirc ocirc Ograve ograve ordf ordm Oslash oslash Otilde otilde Ouml ouml
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- para permil plusmn pound
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- quot
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- raquo reg
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- sect shy sup1 sup2 sup3 szlig
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- THORN thorn times trade
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- Uacute uacute Ucirc ucirc Ugrave ugrave uml Uuml uuml
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- Yacute yacute
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- yen Yuml yuml
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\note You can't effectively set the box() to FL_NO_BOX, this would result
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in FL_DOWN_BOX being used as the boxtype of the widget. This is unexpected
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but can't be changed for backwards compatibility. If you don't want a frame
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around the widget you can use FL_FLAT_BOX instead.
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*/
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class FL_EXPORT Fl_Help_View : public Fl_Group { // Help viewer widget
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enum { RIGHT = -1, CENTER, LEFT }; ///< Alignments
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char title_[1024]; ///< Title string
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Fl_Color defcolor_, ///< Default text color
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bgcolor_, ///< Background color
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textcolor_, ///< Text color
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linkcolor_; ///< Link color
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Fl_Font textfont_; ///< Default font for text
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Fl_Fontsize textsize_; ///< Default font size
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const char *value_; ///< HTML text value
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Fl_Help_Font_Stack fstack_; ///< font stack management
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int nblocks_, ///< Number of blocks/paragraphs
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ablocks_; ///< Allocated blocks
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Fl_Help_Block *blocks_; ///< Blocks
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Fl_Help_Func *link_; ///< Link transform function
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int nlinks_, ///< Number of links
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alinks_; ///< Allocated links
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Fl_Help_Link *links_; ///< Links
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int ntargets_, ///< Number of targets
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atargets_; ///< Allocated targets
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Fl_Help_Target *targets_; ///< Targets
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char directory_[FL_PATH_MAX];///< Directory for current file
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char filename_[FL_PATH_MAX]; ///< Current filename
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int topline_, ///< Top line in document
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leftline_, ///< Lefthand position
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size_, ///< Total document length
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hsize_, ///< Maximum document width
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scrollbar_size_; ///< Size for both scrollbars
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Fl_Scrollbar scrollbar_, ///< Vertical scrollbar for document
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hscrollbar_; ///< Horizontal scrollbar
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static int selection_first;
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static int selection_last;
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static int selection_push_first;
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static int selection_push_last;
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static int selection_drag_first;
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static int selection_drag_last;
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static int selected;
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static int draw_mode;
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static int mouse_x;
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static int mouse_y;
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static int current_pos;
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static Fl_Help_View *current_view;
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static Fl_Color hv_selection_color;
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static Fl_Color hv_selection_text_color;
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void initfont(Fl_Font &f, Fl_Fontsize &s, Fl_Color &c) { f = textfont_; s = textsize_; c = textcolor_; fstack_.init(f, s, c); }
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void pushfont(Fl_Font f, Fl_Fontsize s) {fstack_.push(f, s, textcolor_);}
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void pushfont(Fl_Font f, Fl_Fontsize s, Fl_Color c) {fstack_.push(f, s, c);}
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void popfont(Fl_Font &f, Fl_Fontsize &s, Fl_Color &c) {fstack_.pop(f, s, c);}
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Fl_Help_Block *add_block(const char *s, int xx, int yy, int ww, int hh, uchar border = 0);
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void add_link(const char *n, int xx, int yy, int ww, int hh);
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void add_target(const char *n, int yy);
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static int compare_targets(const Fl_Help_Target *t0, const Fl_Help_Target *t1);
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int do_align(Fl_Help_Block *block, int line, int xx, int a, int &l);
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protected:
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void draw() FL_OVERRIDE;
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private:
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void format();
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void format_table(int *table_width, int *columns, const char *table);
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void free_data();
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int get_align(const char *p, int a);
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const char *get_attr(const char *p, const char *n, char *buf, int bufsize);
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Fl_Color get_color(const char *n, Fl_Color c);
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Fl_Shared_Image *get_image(const char *name, int W, int H);
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int get_length(const char *l);
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public:
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int handle(int) FL_OVERRIDE;
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private:
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void hv_draw(const char *t, int x, int y, int entity_extra_length = 0);
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char begin_selection();
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char extend_selection();
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void end_selection(int c=0);
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void clear_global_selection();
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Fl_Help_Link *find_link(int, int);
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void follow_link(Fl_Help_Link*);
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public:
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Fl_Help_View(int xx, int yy, int ww, int hh, const char *l = 0);
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~Fl_Help_View();
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/** Returns the current directory for the text in the buffer. */
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const char *directory() const { if (directory_[0]) return (directory_);
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else return ((const char *)0); }
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/** Returns the current filename for the text in the buffer. */
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const char *filename() const { if (filename_[0]) return (filename_);
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else return ((const char *)0); }
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int find(const char *s, int p = 0);
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/**
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This method assigns a callback function to use when a link is
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followed or a file is loaded (via Fl_Help_View::load()) that
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requires a different file or path.
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The callback function receives a pointer to the Fl_Help_View
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widget and the URI or full pathname for the file in question.
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It must return a pathname that can be opened as a local file or NULL:
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\code
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const char *fn(Fl_Widget *w, const char *uri);
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\endcode
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The link function can be used to retrieve remote or virtual
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documents, returning a temporary file that contains the actual
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data. If the link function returns NULL, the value of
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the Fl_Help_View widget will remain unchanged.
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If the link callback cannot handle the URI scheme, it should
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return the uri value unchanged or set the value() of the widget
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before returning NULL.
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*/
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void link(Fl_Help_Func *fn) { link_ = fn; }
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int load(const char *f);
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void resize(int,int,int,int) FL_OVERRIDE;
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/** Gets the size of the help view. */
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int size() const { return (size_); }
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void size(int W, int H) { Fl_Widget::size(W, H); }
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/** Sets the default text color. */
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void textcolor(Fl_Color c) { if (textcolor_ == defcolor_) textcolor_ = c; defcolor_ = c; }
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/** Returns the current default text color. */
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Fl_Color textcolor() const { return (defcolor_); }
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/** Sets the default text font. */
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void textfont(Fl_Font f) { textfont_ = f; format(); }
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/** Returns the current default text font. */
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Fl_Font textfont() const { return (textfont_); }
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/** Sets the default text size. */
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void textsize(Fl_Fontsize s) { textsize_ = s; format(); }
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/** Gets the default text size. */
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Fl_Fontsize textsize() const { return (textsize_); }
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/** Returns the current document title, or NULL if there is no title. */
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const char *title() { return (title_); }
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void topline(const char *n);
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void topline(int);
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/** Returns the current top line in pixels. */
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int topline() const { return (topline_); }
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void leftline(int);
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/** Gets the left position in pixels. */
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int leftline() const { return (leftline_); }
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void value(const char *val);
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/** Returns the current buffer contents. */
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const char *value() const { return (value_); }
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void clear_selection();
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void select_all();
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/**
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Gets the current size of the scrollbars' troughs, in pixels.
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If this value is zero (default), this widget will use the
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Fl::scrollbar_size() value as the scrollbar's width.
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\returns Scrollbar size in pixels, or 0 if the global Fl::scrollbar_size() is being used.
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\see Fl::scrollbar_size(int)
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*/
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int scrollbar_size() const {
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return(scrollbar_size_);
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}
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/**
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Sets the pixel size of the scrollbars' troughs to \p newSize, in pixels.
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Normally you should not need this method, and should use
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Fl::scrollbar_size(int) instead to manage the size of ALL
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your widgets' scrollbars. This ensures your application
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has a consistent UI, is the default behavior, and is normally
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what you want.
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Only use THIS method if you really need to override the global
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scrollbar size. The need for this should be rare.
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Setting \p newSize to the special value of 0 causes the widget to
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track the global Fl::scrollbar_size(), which is the default.
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\param[in] newSize Sets the scrollbar size in pixels.\n
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If 0 (default), scrollbar size tracks the global Fl::scrollbar_size()
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\see Fl::scrollbar_size()
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*/
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void scrollbar_size(int newSize) {
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scrollbar_size_ = newSize;
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}
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};
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#endif // !Fl_Help_View_H
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