Annotation of libwww/Library/src/HTStyle.html, revision 2.28
2.6 timbl 1: <HTML>
2: <HEAD>
2.27 frystyk 3: <TITLE>W3C Sample Code Library libwww STYLE MANAGER</TITLE>
2.26 frystyk 4: <!-- Changed by: Henrik Frystyk Nielsen, 23-Mar-1996 -->
2.12 frystyk 5: </HEAD>
2.6 timbl 6: <BODY>
2.11 frystyk 7:
2.12 frystyk 8: <H1>Style Definition for Hypertext</H1>
9:
10: <PRE>
11: /*
2.17 frystyk 12: ** (c) COPYRIGHT MIT 1995.
2.12 frystyk 13: ** Please first read the full copyright statement in the file COPYRIGH.
14: */
15: </PRE>
16:
17: Styles allow the translation between a logical property of a piece of
18: text and its physical representation. A StyleSheet is a collection of
19: styles, defining the translation necessary to represent a document. It
20: is a linked list of styles.
2.11 frystyk 21:
22: <H2>Overriding this module</H2>
23:
24: Why is the style structure declared in the HTStyle.h module, instead
25: of having the user browser define the structure, and the HTStyle
26: routines just use sizeof() for copying?<P>
27:
28: It's not obvious whether HTStyle.c should be common code. It's useful
29: to have common code for loading style sheets, especially if the
30: movement toward standard style sheets gets going.<P>
31:
32: If it <B>is</B> common code, then both the hypertext object and
33: HTStyle.c must know the structure of a style, so HTStyle.h is a
34: suitable place to put that.<P>
35:
36: If we take it out of the library, then of course HTStyle could be
37: declared as an undefined structure. The only references to it are in
38: the structure-flattening code HTML.c and HTPlain.c, which only use
39: HTStypeNamed().<P>
40:
41: You can in any case override this function in your own code, which
42: will prevent the HTStyle from being loaded. You will be able to
43: redefine your style structure in this case without problems, as no
2.12 frystyk 44: other moule needs to know it. <P>
45:
46: This module is implemented by <A HREF="HTStyle.c">HTStyle.c</A>, and
47: it is a part of the <A
2.28 ! frystyk 48: HREF="http://www.w3.org/Library/">
2.27 frystyk 49: W3C Sample Code Library</A>.
2.11 frystyk 50:
2.10 timbl 51: <PRE>
52: #ifndef HTStyle_H
2.1 timbl 53: #define HTStyle_H
54:
2.8 luotonen 55: #include "HTFormat.h"
2.1 timbl 56: #include "HTAnchor.h"
2.10 timbl 57: #include "HTML.h"
2.1 timbl 58:
59: typedef long int HTFont; /* Dummy definition instead */
60:
2.9 timbl 61: #ifdef DEFINE_STRUCT_HTSTYLE
2.1 timbl 62: #ifdef NeXT_suppressed
63: typedef NXCoord HTCoord;
64: #define HTParagraphStyle NXTextStyle
65: #define HTCoord NXCoord
66: typedef struct _color {
2.15 frystyk 67: double grey;
2.1 timbl 68: int RGBColor;
69: } HTColor;
70: #else
71:
2.15 frystyk 72: typedef double HTCoord;
2.1 timbl 73:
74: typedef struct _HTParagraphStyle {
75: HTCoord left_indent; /* @@@@ junk! etc etc*/
76: } HTParagraphStyle;
77:
78: typedef int HTColor; /* Sorry about the US spelling! */
79:
80: #endif
81:
82: typedef struct {
83: short kind; /* only NX_LEFTTAB implemented*/
84: HTCoord position; /* x coordinate for stop */
85: } HTTabStop;
86:
2.9 timbl 87: #else
88: typedef struct _HTParagraphStyle HTParagraphStyle;
89: #endif
90:
91:
92:
93: #define STYLE_NAME_LENGTH 80 /* @@@@@@@@@@@ */
94:
2.1 timbl 95:
96: /* The Style Structure
97: ** -------------------
98: */
99:
2.22 frystyk 100: typedef struct _HTStyle HTStyle;
2.26 frystyk 101: </PRE>
2.1 timbl 102:
2.10 timbl 103: <h2>Style Creation</h2>
2.26 frystyk 104:
2.10 timbl 105: <h3>HtStyleModify</h3>
2.26 frystyk 106:
2.10 timbl 107: This routine is passed the style for a particular SGML nesting state,
108: and the element number of a new element whithin that state.
109: The routine returns a suitable style for text within the new element.
110: It is passed a popinter tothe nesting state so that it can link
111: the style back to the nesting state for later manipulation
112: of the SGML nesting tree.
2.26 frystyk 113: <PRE>
2.10 timbl 114:
2.23 frystyk 115: extern HTStyle * HTStyleModify (
2.10 timbl 116: HTStyle * style,
117: HTNesting* nesting,
2.23 frystyk 118: int element_number);
2.10 timbl 119:
120:
2.1 timbl 121:
122: /* Style functions:
123: */
2.23 frystyk 124: extern HTStyle * HTStyleNew (void);
2.24 frystyk 125: extern HTStyle* HTStyleNewNamed (const char * name);
2.23 frystyk 126: extern HTStyle * HTStyleFree (HTStyle * self);
2.1 timbl 127: #ifdef SUPRESS
2.23 frystyk 128: extern HTStyle * HTStyleRead (HTStyle * self, HTStream * stream);
129: extern HTStyle * HTStyleWrite (HTStyle * self, HTStream * stream);
2.1 timbl 130: #endif
131: /* Style Sheet
132: ** -----------
133: */
134: typedef struct _HTStyleSheet {
135: char * name;
136: HTStyle * styles;
137: } HTStyleSheet;
138:
139:
140: /* Stylesheet functions:
141: */
2.23 frystyk 142: extern HTStyleSheet * HTStyleSheetNew (void);
143: extern HTStyleSheet * HTStyleSheetFree (HTStyleSheet * self);
2.24 frystyk 144: extern HTStyle * HTStyleNamed (HTStyleSheet * self, const char * name);
2.23 frystyk 145: extern HTStyle * HTStyleMatching (HTStyleSheet *self, HTStyle * style);
146: /* extern HTStyle * HTStyleForRun (HTStyleSheet *self, NXRun * run); */
147: extern HTStyleSheet * HTStyleSheetAddStyle (HTStyleSheet * self,
148: HTStyle * style);
149: extern HTStyleSheet * HTStyleSheetRemoveStyle (HTStyleSheet * self,
150: HTStyle * style);
2.1 timbl 151: #ifdef SUPPRESS
2.23 frystyk 152: extern HTStyleSheet * HTStyleSheetRead (HTStyleSheet * self,
153: HTStream * stream);
154: extern HTStyleSheet * HTStyleSheetWrite (HTStyleSheet * self,
155: HTStream * stream);
2.1 timbl 156: #endif
157: #define CLEAR_POINTER ((void *)-1) /* Pointer value means "clear me" */
158: #endif /* HTStyle_H */
2.26 frystyk 159: </PRE>
2.6 timbl 160:
2.26 frystyk 161: <HR>
162: <ADDRESS>
2.28 ! frystyk 163: @(#) $Id: HTStyle.html,v 2.27 1997/02/16 18:43:02 frystyk Exp $
2.26 frystyk 164: </ADDRESS>
2.7 timbl 165: </BODY>
2.6 timbl 166: </HTML>
Webmaster
![[BACK]](/cvsweb/icons/back.gif){kind=icon}
Return to HTStyle.html CVS log ![[TXT]](/cvsweb/icons/text.gif){kind=icon}
![[DIR]](/cvsweb/icons/dir.gif){kind=icon}
Up to [Public] / libwww / Library / src