-\membersection{Tag Handlers}\label{handlers}
+\subsection{Tag Handlers}\label{handlers}
-wxHTML library provides architecture of pluginable {\it tag handlers}.
+The wxHTML library provides architecture of pluggable {\it tag handlers}.
Tag handler is class that understands particular HTML tag (or tags) and is
able to interpret it.
\helpref{wxHtmlWinParser}{wxhtmlwinparser} has static table of {\bf modules}.
-Each module contains one or more tag handlers. Each time new wxHtmlWinParser
+Each module contains one or more tag handlers. Each time a new wxHtmlWinParser
object is constructed all modules are scanned and handlers are added
-to wxHtmlParser's list of available handlers (note : wxHtmlParser's list
+to wxHtmlParser's list of available handlers (note: wxHtmlParser's list
is non-static).
\wxheading{How it works}
Common tag handler's \helpref{HandleTag}{wxhtmltaghandlerhandletag} method
works in four steps:
-\begin{enumerate}
+\begin{enumerate}\itemsep=0pt
\item Save state of parent parser into local variables
\item Change parser state according to tag's params
\item Parse text between the tag and paired ending tag (if present)
The handler is derived from \helpref{wxHtmlWinTagHandler}{wxhtmlwintaghandler}
(or directly from \helpref{wxHtmlTagHandler}{wxhtmltaghandler})
-You can use set of macros to define the handler (see src/mod_*.cpp files
-for details). Handler definition must start with {\bf TAG_HANDLER_BEGIN} macro
-and end with {\bf TAG_HANDLER_END} macro. I strongly recommend to have a look
-at {\it include/wxhtml/mod_templ.h} file. Otherwise you won't understand
-the structure of macros... See macros reference:
+You can use set of macros to define the handler (see src/mod\_*.cpp files
+for details). Handler definition must start with {\bf TAG\_HANDLER\_BEGIN} macro
+and end with {\bf TAG\_HANDLER\_END} macro. I strongly recommend to have a look
+at {\it include/wxhtml/mod\_templ.h} file. Otherwise you won't understand
+the structure of macros. See macros reference:
-{\bf TAG_HANDLER_BEGIN}({\it name}, {\it tags})
+{\bf TAG\_HANDLER\_BEGIN}({\it name}, {\it tags})
Starts handler definition. {\it name} is handler identifier (in fact
part of class name), {\it tags} is string containing list of tags
supported by this handler (in uppercase). This macro derives new class from
-wxHtmlWinTagHandler and implements it's
+wxHtmlWinTagHandler and implements it is
\helpref{GetSupportedTags}{wxhtmltaghandlergetsupportedtags} method.
-Example: TAG_HANDLER_BEGIN(FONTS, "B,I,U,T")
+Example: TAG\_HANDLER\_BEGIN(FONTS, "B,I,U,T")
-{\bf TAG_HANDLER_VARS}
+{\bf TAG\_HANDLER\_VARS}
This macro starts block of variables definitions. (Variables are identical
to class attributes.) Example:
This macro is used only in rare cases.
-{\bf TAG_HANDLER_CONSTR}({\it name})
+{\bf TAG\_HANDLER\_CONSTR}({\it name})
This macro supplies object constructor. {\it name} is same name as the one
-from TAG_HANDLER_BEGIN macro. Body of constructor follow after
+from TAG\_HANDLER\_BEGIN macro. Body of constructor follow after
this macro (you must use { and } ). Example:
\begin{verbatim}
Never used in wxHTML :-)
-{\bf TAG_HANDLER_PROC}({\it varib})
+{\bf TAG\_HANDLER\_PROC}({\it varib})
This is very important macro. It defines \helpref{HandleTag}{wxhtmltaghandlerhandletag}
method. {\it varib} is name of parameter passed to the method, usually
TAG_HANDLER_END(TITLE)
\end{verbatim}
-{\bf TAG_HANDLER_END}({\it name})
+{\bf TAG\_HANDLER\_END}({\it name})
Ends definition of tag handler {\it name}.
-
\wxheading{Tags Modules}
-You can use set of 3 macros TAGS_MODULE_BEGIN, TAGS_MODULE_ADD and
-TAGS_MODULE_END to inherit new module from
+You can use set of 3 macros TAGS\_MODULE\_BEGIN, TAGS\_MODULE\_ADD and
+TAGS\_MODULE\_END to inherit new module from
\helpref{wxHtmlTagsModule}{wxhtmltagsmodule} and to create instance of it.
See macros reference:
-{\bf TAGS_MODULE_BEGIN}({\it modname})
+{\bf TAGS\_MODULE\_BEGIN}({\it modname})
Begins module definition. {\it modname} is part of class name and must
be unique.
-{\bf TAGS_MODULE_ADD}({\it name})
+{\bf TAGS\_MODULE\_ADD}({\it name})
Adds the handler to this module. {\it name} is the identifier from
-TAG_HANDLER_BEGIN.
+TAG\_HANDLER\_BEGIN.
-{\bf TAGS_MODULE_END}({\it modname})
+{\bf TAGS\_MODULE\_END}({\it modname})
Ends the definition of module.
TAGS_MODULE_ADD(TITLE)
TAGS_MODULE_END(Examples)
\end{verbatim}
+
projects / wxWidgets.git / blobdiff