/******************************************************************************

 *

 * 

 *

 * Copyright (C) 1997-2008 by Dimitri van Heesch.

 *

 * Permission to use, copy, modify, and distribute this software and its

 * documentation under the terms of the GNU General Public License is hereby 

 * granted. No representations are made about the suitability of this software 

 * for any purpose. It is provided "as is" without express or implied warranty.

 * See the GNU General Public License for more details.

 *

 * Documents produced by Doxygen are derivative works derived from the

 * input used in their production; they are not affected by this license.

 *

 */

/*! \page customize Customizing the output

Doxygen provides various levels of customization. 

The \ref minor_tweaks "first section" discusses what to 

do if you want to do minor tweaker to the look and feel of the output. 

The \ref layout "next" section show how to reorder and hide certain 

information on a page. 

The \ref xmlgenerator "last" section show how to generate whatever output

you want based on the XML output produced by doxygen.

\section minor_tweaks Minor Tweaks

To simply tweak things like fonts or colors, margins, or other look \& feel

espects of the HTML output you can create a different 

<a href="http://www.w3schools.com/css/default.asp">cascading style sheet</a>. 

You can also let doxygen use a custom header and footer for each HTML 

page it generates, for instance to include a logo or to make the 

doxygen output blend in with the rest of the web site.

To do this first run doxygen as follows:

\verbatim

doxygen -w html header.html footer.html customdoxygen.css 

\endverbatim

This will create 3 files:

- header.html is a HTML fragment which doxygen normally uses to start

  a HTML page. Note that the fragment ends with a body tag and that is

  contains a couple of commands of the form \$word. These will be replaced

  by doxygen on the fly. 

- footer.html is a HTML fragment which doxygen normally uses to end 

  a HTML page. Also here special commands can be used. This file contain the 

  link to www.doxygen.org and the body and html end tags.

- customdoxygen.css is the default cascading style sheet

  used by doxygen. 

You should edit these files and then reference them from the config file.

\verbatim

HTML_HEADER      = header.html

HTML_FOOTER      = footer.html

HTML_STYLESHEET  = customdoxygen.css

\endverbatim

See the documentation of the \ref cfg_html_header "HTML_HEADER" tag

for more information about the possible meta commands.

\note You should not put the style sheet in the HTML output directory. Treat

it is a source file. Doxygen will copy it for you. 

\note If you use images or other external content in a custom header you

need to make sure these end up in the HTML output directory yourself,

for instance by writing a script that runs doxygen can then copies the

images to the output.

\section layout Changing the layout of pages

In some cases you may want to change the way the output is structured.

A different style sheet or custom headers and footers do not help in such 

case.

The solution doxygen provides is a layout file, which you can

modify and doxygen will use to control what information is presented, 

in which order, and to some extent also how information is presented.

The layout file is an XML file. 

The default layout can be generated

by doxygen using the following command:

\verbatim

doxygen -l 

\endverbatim

optionally the name of the layout file can be specified, if omitted

\c DoxygenLayout.xml will be used.

The next step is to mention the layout file in the config file

\verbatim

LAYOUT_FILE = DoxygenLayout.xml

\endverbatim

The change the layout all you need to do is edit the layout file.

The toplevel structure of the file looks as follows:

\verbatim

<doxygenlayout version="1.0">

  <navindex>

    ...

  </navindex>

  <class>

    ...

  </class>

  <namespace>

    ...

  </namespace>

  <file>

    ...

  </file>

  <group>

    ...

  </group>

  <directory>

    ...

  </directory>

</doxygenlayout>

\endverbatim

The root tag of the XML is \c doxygenlayout, it has an attribute named

\c version, which will be used in the future to cope with changes that are

not backward compatible.

The first section, enclosed by \c navindex tags represents the layout of 

the navigation tabs displayed at the top of each HTML page. 

Each tab is represented by a \c tab tag in the XML file.

You can hide tabs by setting the \c visible attribute to \c no. 

You can also override the default title of a tab by specifying it as 

the value of the \c title attribute. If the title field is the empty string

(the default) then doxygen will fill in an appropriate title.

You can reorder the tabs by moving the tab tags in the XML file

within the \c navindex section and even change the tree structure. 

Do not change the value of the \c type attribute however. 

Only a fixed set of types are supported, each representing a link to a 

specific index.

The sections after \c navindex represent the layout of the different 

pages generated by doxygen:

- The \c class section represents the layout of all pages generated for

  documented classes, structs, unions, and interfaces.

- The \c namespace section represents the layout of all pages generated for

  documented namespaces (and also Java packages).

- The \c file section represents the layout of all pages generated for

  documented files.

- The \c group section represents the layout of all pages generated for

  documented groups (or modules).

- The \c directory section represents the layout of all pages generated for

  documented directories.

Each XML tag within one of the above page sections represents a certain

piece of information. Some pieces can appear in each type of page,

others are specific for a certain type of page.

Doxygen will list the pieces in the order in which they appear 

in the XML file. 

Some tags have a \c visible attribute which can be 

used to hide the fragment from the generated output, by setting the attribute's

value to "no". You can also use the value of a configuration option to 

determine the visibility, by using 

its name prefixed with a dollar sign, e.g.

\verbatim

  ...

  <includes visible="$SHOW_INCLUDE_FILES"/>

  ...

\endverbatim

This was mainly added for backward compatibility.

Note that the \c visible attribute is just a hint for doxygen. 

If no relevant information is available for a certain piece it is 

omitted even if it is set to \c yes (i.e. no empty sections are generated). 

Some tags have a \c title attribute. This attribute can be used

to customize the title doxygen will use as a header for the piece.

@warning at the moment you should not remove tags from the layout file

as a way to hide information. Doing so can cause broken links in the 

generated output!

At the moment the following generic tags are possible for each page:

<dl>

<dt>\c briefdescription

  <dd>Represents the brief description on a page.

<dt>\c detaileddescription

  <dd>Represents the detailed description on a page.

<dt>\c authorsection

  <dd>Represents the author section of a page (only used for man pages).

<dt>\c memberdecl

  <dd>Represents the quick overview of members on a page (member declarations).

      This tag has child tags each representing a list of 

      members of a certain type. 

      The possible child tags are not listed in detail in the document, 

      but the name of the tag should be a good indication of the type 

      of members that the tag represents.

<dt>\c memberdef

  <dd>Represents the detailed member list on a page (member definition).

      Like the \c memberdecl tag, also this tag has a number of 

      possible child tags. 

</dl>

The class page has the following specific tags:

<dl>

<dt>\c includes

  <dd>Represents the include file needed to obtain the definition for 

      this class.

<dt>\c inheritancegraph

  <dd>Represents the inheritance relations for a class. 

      Note that the CLASS_DIAGRAM option determines

      if the inheritance relation is a list of base and derived classes or

      a graph. 

<dt>\c collaborationgraph

  <dd>Represents the collaboration graph for a class.

<dt>\c allmemberslink

  <dd>Represents the link to the list of all members for a class.

<dt>\c usedfiles

  <dd>Represents the list of files from which documentation for the class was

      extracted.

</dl>

The file page has the following specific tags:

<dl>

<dt>\c includes

  <dd>Represents the list of \#include statements contained in this file.

<dt>\c includegraph

  <dd>Represents the include dependency graph for the file.

<dt>\c includedbygraph

  <dd>Represents the included by dependency graph for the file.

<dt>\c sourcelink

  <dd>Represents the link to the source code of this file.

</dl>

The group page has a specific \c groupgraph tag which represents the

graph showing the dependencies between groups.

Similarily, the directory page has a specific \c directorygraph tag 

which represents the graph showing the dependencies between the directories 

based on the \#include relations of the files inside the directories.

\section xmlgenerator Using the XML output

If the above two methods still do not provide enough flexibility, you

can also use the XML output produced by doxygen as a basis to

generate the output you like. To do this set GENERATE_XML to YES.

The XML output consists of an index file named \c index.xml which

lists all items extracted by doxygen with references to the other XML files

for details. The structure of the index is described by a schema file

\c index.xsd. All other XML files are described by the schema file 

named \c compound.xsd. If you prefer one big XML file 

you can combine the index and the other files using the 

XSLT file \c combine.xslt.

You can use any XML parser to parse the file or use the one that can be found

in the \c addon/doxmlparser directory of doxygen source distribution. 

Look at \c addon/doxmlparser/include/doxmlintf.h for the interface of the

parser and in \c addon/doxmlparser/example for examples.

The advantage of using the doxmlparser is that it

will only read the index file into memory and then only those XML 

files that you implicitly load via navigating through the index. As a 

result this works even for very large projects where reading all XML

files as one big DOM tree would not fit into memory.

 */