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[wxWidgets.git] / docs / latex / wx / httag.tex

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\section{\class{wxHtmlTag}}\label{wxhtmltag}

This class represents a single HTML tag. 
It is used by \helpref{tag handlers}{handlers}.

\wxheading{Derived from}

wxObject

\wxheading{Include files}

<wx/html/htmltag.h>

\latexignore{\rtfignore{\wxheading{Members}}}

\membersection{wxHtmlTag::wxHtmlTag}\label{wxhtmltagwxhtmltag}

\func{}{wxHtmlTag}{\param{const wxString\& }{source}, \param{int }{pos}, \param{int }{end\_pos}, \param{wxHtmlTagsCache* }{cache}}

Constructor. You will probably never have to construct a wxHtmlTag object
yourself. Feel free to ignore the constructor parameters.
Have a look at src/html/htmlpars.cpp if you're interested in creating it.

\membersection{wxHtmlTag::GetAllParams}\label{wxhtmltaggetallparams}

\constfunc{const wxString\&}{GetAllParams}{\void}

Returns a string containing all parameters.

Example : tag contains {\tt <FONT SIZE=+2 COLOR="\#000000">}. Call to
tag.GetAllParams() would return {\tt SIZE=+2 COLOR="\#000000"}.


\membersection{wxHtmlTag::GetBeginPos}\label{wxhtmltaggetbeginpos}

\constfunc{int}{GetBeginPos}{\void}

Returns beginning position of the text {\it between} this tag and paired
ending tag. 
See explanation (returned position is marked with `|'):

\begin{verbatim}
bla bla bla <MYTAG> bla bla intenal text</MYTAG> bla bla
                   |
\end{verbatim}


\membersection{wxHtmlTag::GetEndPos1}\label{wxhtmltaggetendpos1}

\constfunc{int}{GetEndPos1}{\void}

Returns ending position of the text {\it between} this tag and paired
ending tag.
See explanation (returned position is marked with `|'):

\begin{verbatim}
bla bla bla <MYTAG> bla bla intenal text</MYTAG> bla bla
                                        |
\end{verbatim}


\membersection{wxHtmlTag::GetEndPos2}\label{wxhtmltaggetendpos2}

\constfunc{int}{GetEndPos2}{\void}

Returns ending position 2 of the text {\it between} this tag and paired
ending tag.
See explanation (returned position is marked with `|'):

\begin{verbatim}
bla bla bla <MYTAG> bla bla intenal text</MYTAG> bla bla
                                               |
\end{verbatim}

\membersection{wxHtmlTag::GetName}\label{wxhtmltaggetname}

\constfunc{wxString}{GetName}{\void}

Returns tag's name. The name is always in uppercase and it doesn't contain
'<' or '/' characters. (So the name of {\tt <FONT SIZE=+2>} tag is "FONT"
and name of {\tt </table>} is "TABLE")


\membersection{wxHtmlTag::GetParam}\label{wxhtmltaggetparam}

\constfunc{wxString}{GetParam}{\param{const wxString\& }{par}, \param{bool }{with\_commas = FALSE}}

Returns the value of the parameter. You should check whether the
parameter exists or not (use \helpref{HasParam}{wxhtmltaghasparam}) first.

\wxheading{Parameters}

\docparam{par}{The parameter's name.}

\docparam{with\_commas}{TRUE if you want to get commas as well. See example.}

\wxheading{Example}

\begin{verbatim}
...
/* you have wxHtmlTag variable tag which is equal to
   HTML tag <FONT SIZE=+2 COLOR="#0000FF"> */
dummy = tag.GetParam("SIZE");
   // dummy == "+2"
dummy = tag.GetParam("COLOR");
   // dummy == "#0000FF"
dummy = tag.GetParam("COLOR", TRUE);
   // dummy == "\"#0000FF\"" -- see the difference!!
\end{verbatim}

\membersection{wxHtmlTag::GetParamAsColour}\label{wxhtmltaggetparamascolour}

\constfunc{bool}{GetParamAsColour}{\param{const wxString\& }{par}, \param{wxColour *}{clr}}

Interprets tag parameter {\it par} as colour specification and saves its value
into wxColour variable pointed by {\it clr}.

Returns TRUE on success and FALSE if {\it par} is not colour specification or
if the tag has no such parameter.

\membersection{wxHtmlTag::GetParamAsInt}\label{wxhtmltaggetparamasint}

\constfunc{bool}{GetParamAsInt}{\param{const wxString\& }{par}, \param{int *}{value}}

Interprets tag parameter {\it par} as an integer and saves its value
into int variable pointed by {\it value}.

Returns TRUE on success and FALSE if {\it par} is not an integer or
if the tag has no such parameter.

\membersection{wxHtmlTag::HasEnding}\label{wxhtmltaghasending}

\constfunc{bool}{HasEnding}{\void}

Returns TRUE if this tag is paired with ending tag, FALSE otherwise.

See the example of HTML document:

\begin{verbatim}
<html><body>
Hello<p>
How are you?
<p align=center>This is centered...</p>
Oops<br>Oooops!
</body></html>
\end{verbatim}

In this example tags HTML and BODY have ending tags, first P and BR 
doesn't have ending tag while the second P has. The third P tag (which
is ending itself) of course doesn't have ending tag.

\membersection{wxHtmlTag::HasParam}\label{wxhtmltaghasparam}

\constfunc{bool}{HasParam}{\param{const wxString\& }{par}}

Returns TRUE if the tag has parameter of the given name. 
Example : {\tt <FONT SIZE=+2 COLOR="\#FF00FF">} has two parameters named
"SIZE" and "COLOR".

\wxheading{Parameters}

\docparam{par}{the parameter you're looking for.}

\membersection{wxHtmlTag::IsEnding}\label{wxhtmltagisending}

\constfunc{bool}{IsEnding}{\void}

Returns TRUE if this tag is ending one.
({\tt </FONT>} is ending tag, {\tt <FONT>} is not)

\membersection{wxHtmlTag::ScanParam}\label{wxhtmltagscanparam}

\constfunc{wxString}{ScanParam}{\param{const wxString\& }{par}, \param{const wxChar *}{format}, \param{void *}{value}}

This method scans given parameter. Usage is exactly the same as sscanf's 
usage except that you don't pass string but parameter name as the first parameter
and that you can only retrieve one value (i.e. you can use only one "\%" element
in {\it format}).


\wxheading{Parameters}

\docparam{par}{The name of tag you want to query}

\docparam{format}{scanf()-like format string.}

\docparam{value}{pointer to a variable to store value in }