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<HTML>
<HEAD>
<TITLE>HTStyle: Style management for libwww</TITLE></HEAD>
<BODY>
<H1>Style Definition for Hypertext</H1>Styles allow the translation
between a logical property of a piece of text and its physical
representation.<P> A StyleSheet is a collection of styles, defining
the translation necessary to represent a document. It is a linked list
of styles.
<H2>Overriding this module</H2>
Why is the style structure declared in the HTStyle.h module, instead
of having the user browser define the structure, and the HTStyle
routines just use sizeof() for copying?<P>
It's not obvious whether HTStyle.c should be common code. It's useful
to have common code for loading style sheets, especially if the
movement toward standard style sheets gets going.<P>
If it <B>is</B> common code, then both the hypertext object and
HTStyle.c must know the structure of a style, so HTStyle.h is a
suitable place to put that.<P>
If we take it out of the library, then of course HTStyle could be
declared as an undefined structure. The only references to it are in
the structure-flattening code HTML.c and HTPlain.c, which only use
HTStypeNamed().<P>
You can in any case override this function in your own code, which
will prevent the HTStyle from being loaded. You will be able to
redefine your style structure in this case without problems, as no
other moule needs to know it.
<PRE>
#ifndef HTStyle_H
#define HTStyle_H
#include "HTUtils.h"
#include "HTFormat.h"
#include "HTAnchor.h"
#include "HTML.h"
typedef long int HTFont; /* Dummy definition instead */
#ifdef SHORT_NAMES
#define HTStyleNew HTStNew
#define HTStyleFree HTStFree
#define HTStyleRead HTStRead
#define HTStyleWrite HTStWrite
#define HTStyleSheetNew HTStShNe
#define HTStyleSheetFree HTStShFr
#define HTStyleNamed HTStName
#define HTStyleForParagraph HTStFoPa
#define HTStyleMatching HTStMatc
#define HTStyleForRun HTStFoRu
#define HTStyleSheetAddStyle HTStShAd
#define HTStyleSheetRemoveStyle HTStShRm
#define HTStyleSheetRead HTStShRe
#define HTStyleSheetWrite HTStShWr
#endif
#ifdef DEFINE_STRUCT_HTSTYLE
#ifdef NeXT_suppressed
#include <appkit/appkit.h>
typedef NXCoord HTCoord;
#define HTParagraphStyle NXTextStyle
#define HTCoord NXCoord
typedef struct _color {
float grey;
int RGBColor;
} HTColor;
#else
typedef float HTCoord;
typedef struct _HTParagraphStyle {
HTCoord left_indent; /* @@@@ junk! etc etc*/
} HTParagraphStyle;
typedef int HTColor; /* Sorry about the US spelling! */
#endif
typedef struct {
short kind; /* only NX_LEFTTAB implemented*/
HTCoord position; /* x coordinate for stop */
} HTTabStop;
#else
typedef struct _HTParagraphStyle HTParagraphStyle;
#endif
#define STYLE_NAME_LENGTH 80 /* @@@@@@@@@@@ */
/* The Style Structure
** -------------------
*/
typedef struct _HTStyle
#ifdef DEFINE_STRUCT_HTSTYLE /* Don't */
{
/* Style management information
*/
struct _HTStyle *next; /* Link for putting into stylesheet */
char * name; /* Style name */
char * SGMLTag; /* Tag name to start */
/* Character attributes (a la NXRun)
*/
HTFont font; /* Font id */
HTCoord fontSize; /* The size of font, not independent */
HTColor color; /* text gray of current run */
int superscript; /* superscript (-sub) in points */
HTAnchor *anchor; /* Anchor id if any, else zero */
/* Paragraph Attribtes (a la NXTextStyle)
*/
HTCoord indent1st; /* how far first line in paragraph is
* indented */
HTCoord leftIndent; /* how far second line is indented */
HTCoord rightIndent; /* (Missing from NeXT version */
short alignment; /* quad justification */
HTCoord lineHt; /* line height */
HTCoord descentLine; /* descender bottom from baseline */
HTTabStop *tabs; /* array of tab stops, 0 terminated */
BOOL wordWrap; /* Yes means wrap at space not char */
BOOL freeFormat; /* Yes means \n is just white space */
HTCoord spaceBefore; /* Omissions from NXTextStyle */
HTCoord spaceAfter;
int paraFlags; /* Paragraph flags, bits as follows: */
#define PARA_KEEP 1 /* Do not break page within this paragraph */
#define PARA_WITH_NEXT 2 /* Do not break page after this paragraph */
#define HT_JUSTIFY 0 /* For alignment */
#define HT_LEFT 1
#define HT_RIGHT 2
#define HT_CENTER 3
}
#endif
HTStyle;
</pre>
<h2>Style Creation</h2>
<h3>HtStyleModify</h3>
This routine is passed the style for a particular SGML nesting state,
and the element number of a new element whithin that state.
The routine returns a suitable style for text within the new element.
It is passed a popinter tothe nesting state so that it can link
the style back to the nesting state for later manipulation
of the SGML nesting tree.
<pre>
extern HTStyle * HTStyleModify PARAMS((
HTStyle * style,
HTNesting* nesting,
int element_number));
/* Style functions:
*/
extern HTStyle * HTStyleNew NOPARAMS;
extern HTStyle* HTStyleNewNamed PARAMS ((CONST char * name));
extern HTStyle * HTStyleFree PARAMS((HTStyle * self));
#ifdef SUPRESS
extern HTStyle * HTStyleRead PARAMS((HTStyle * self, HTStream * stream));
extern HTStyle * HTStyleWrite PARAMS((HTStyle * self, HTStream * stream));
#endif
/* Style Sheet
** -----------
*/
typedef struct _HTStyleSheet {
char * name;
HTStyle * styles;
} HTStyleSheet;
/* Stylesheet functions:
*/
extern HTStyleSheet * HTStyleSheetNew NOPARAMS;
extern HTStyleSheet * HTStyleSheetFree PARAMS((HTStyleSheet * self));
extern HTStyle * HTStyleNamed PARAMS((HTStyleSheet * self, CONST char * name));
extern HTStyle * HTStyleMatching PARAMS((HTStyleSheet *self, HTStyle * style));
/* extern HTStyle * HTStyleForRun PARAMS((HTStyleSheet *self, NXRun * run)); */
extern HTStyleSheet * HTStyleSheetAddStyle PARAMS((HTStyleSheet * self,
HTStyle * style));
extern HTStyleSheet * HTStyleSheetRemoveStyle PARAMS((HTStyleSheet * self,
HTStyle * style));
#ifdef SUPPRESS
extern HTStyleSheet * HTStyleSheetRead PARAMS((HTStyleSheet * self,
HTStream * stream));
extern HTStyleSheet * HTStyleSheetWrite PARAMS((HTStyleSheet * self,
HTStream * stream));
#endif
#define CLEAR_POINTER ((void *)-1) /* Pointer value means "clear me" */
#endif /* HTStyle_H */
</BODY>
</HTML>
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