NatSkinConfiguration < System

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---+!! %TOPIC%
%TOC%

---++ Theme configuration
The different NatSkin styles (themes) are controlled using TWiki preference
variables and can be set 
   * per user (on the user's home topic), 
   * per web (in the WebPreferences),
   * site wide (in the [[%SYSTEMWEB%.DefaultPreferences]] or better [[%USERSWEB%.SitePreferences]] and
   * on every request (using url parameters)

Use the NatSkinStyleBrowser to preview the known styles and settings. Note,
that the selection made there will only last for the current session. You
need to add the respective preference variables to your [[%WIKIUSERNAME%][home topic]]
or the WebPreferences or the %USERSWEB%.SitePreferences to make the selection
persistent.

This is the list of variables to configure the skin style:

| *Name%BR%(url param)*  | *Values* | *Description* | *Default* |
| SKINSTYLE (style) | <noautolink>%KNOWNSTYLES%</noautolink> \
| select a predefined style | Clean |
| STYLEVARIATION (stylevariation) | <noautolink>%KNOWNVARIATIONS%</noautolink> \
| select a style variation | none |
| STYLEBORDER (styleborder) | on, off, thin \
| change the border decoration; thin enables a blog-like page layout | off |
| STYLEBUTTONS (stylebuttons) | on, off \
| switch on/of the tab buttons above the topic area | off |
| STYLESIDEBAR (stylesidebar) | left, right, both, off \
| configure where the sidebar is to be displayed | left |
| STYLESEARCHBOX (stylesearchbox) | top, pos1, pos2, pos3, off \
| configure where the searchbox is to be displayed: \
  in the topbar (top), at the top of the sidebar (pos1), \
  in the middle of the sidebar (pos2), \
  at the bottom of the sidebar (pos3) or off | top |
      
There are a couple of special url parameters:
   * =togglesidebar=: disable the sidebar for this request only. 
   * =style=off=: switch off any styles (simulating a non-css browser)
   * =style=reset=: switch back to the user and server settings by reverting any 
     session preferences
   * =switchstyle=next/prev=: switch to the next/previous known style
   * =switchvariation=next/prev=: switch to the next/previous known style variation
     
*Example*: To emulate the Kubrick style on the old
[[http://binarybonsai.com][BinaryBonsai]] (not the new K2 style) use
<verbatim>
  * Set SKINSTYLE = Kubrick
  * Set STYLEBORDER = thin
  * Set STYLEBUTTONS = on
  * Set STYLESIDEBAR = right
  * Set STYLEVARIATION = none
  * Set STYLESEARCHBOX = pos1
</verbatim>

There are some constraints build into the NatSkin templates that try guarantee a pleasant appearance
when combining the different skin states:
   * If the styleborder is "thin" the sidebar will be disabled for the edit, manage, rdiff,
     natsearch, changes and search topic actions. 
   * The web buttons will alternate with the sidebar so that they will not be displayed
     on the same side. 
   * If the web buttons are enabled the default [[TWikiWebSideBar][WebSideBar]] will disable the redundant 
     navigation to other webs.

---++ Defining new Themes
The NatSkin can be themed using cascading styles attached to the <nop>%SYSTEMWEB%.NatSkin or any
other topic defined in the STYLEPATH preference variable.
This variable is a list of topics that are consulted for css attachments. The default value is
<verbatim>
  * Set STYLEPATH = %SYSTEMWEB%.NatSkin
</verbatim>

Styles are collected in the order specified. This allows to insert style contributions that are
not part of the NatSkin. For example given you uploaded NatSkin css definitions to a topic
<nop>Main.NatSkinThemesContrib you can activate them by setting the STYLEPATH to

<verbatim>
  * Set STYLEPATH = Main.NatSkinThemesContrib, %SYSTEMWEB%.NatSkin
</verbatim>

Css files must obey the following naming scheme to be recognized
   * =&lt;name>Style.css=: basic style definitions for style &lt;name>
   * =&lt;name>Buttons.css=: <nop>WebButton definitions for style &lt;name>
   * =&lt;name>Border.css=: definitions for style &lt;name> displayed using =STYLEBORDER = on=
   * =&lt;name>Thin.css=: definitions for style &lt;name> displayed using =STYLEBORDER = thin=
   * =&lt;name>Thin.css=: definitions for style &lt;name> displayed using =STYLEBORDER = thin=
   * =&lt;name>Variation.css=: style variations that can be applied to any base style; this
     can be used to vary a base style, e.g. to add header art or change some fonts and colours

---+++ Email Obfuscation
The standard TWiki engine tries to obfuscate email addresses by adding a phrase to the email url (like NOSPAM)
to fool collecting web crawlers. But that is not adequate enough today as crawlers are aware of that. The solution
to that is to remove every trace of a pattern that could be an email address from the html source code and regenerate
them using javascript. Most likely, web crawlers will only parse the html and don't run a javascript interpreter 
beforehand. Nevertheless the obfuscation feature can be switched on and off by adding the =OBFUSCATEEMAIL= variable
to your %SYSTEMWEB%.DefaultPreferences or %USERSWEB%.SitePreferences like

<verbatim>
  * Set OBFUSCATEEMAIL = on
</verbatim>

---++ Misc preference variables
There is a set of variables that can be used influence how NatSkin behaves or renders pages.

| *Name* | *Description* |
| =HTMLTITLE= | the &lt;title>...</title> of the html page; if no HTMLTITLE is defined the NatSkin \
                will check for some formfields (Headlines, <nop>TopicDescription) to be used as a html page title \
      and back off to the topic name |
| =METAAUTHOR= | the value of this variable will be used to construct &lt;meta name="author" ... /> in the html head |
| =METADESCRIPTION= | the value of this variable will be used to construct &lt;meta name="description" ... /> in the html head |
| =METAKEYWORDS= | the value of this variable will be used to construct &lt;meta name="keywords" ... /> in the html head |
| =WHITEBOARD= | possible values: on, off; if WHITEBOARD is set to only the topic form will be edited \
                when clicking on "Edit"; note, that the textarea is still accessible and not hidden completely; \
      this is flag is only there for convenience |

Hint: Assign default meta data _per web_ by adding
<verbatim>
  * Set DEFAULT_METAKEYWORDS = keyword1, keyword2, keyword3
  * Set METAKEYWORDS = %DEFAULT_METAKEYWORDS%
</verbatim>
to the WebPreferences and add extra keyword data _per topic_ like this
<verbatim>
  * Set METAKEYWORDS = %DEFAULT_METAKEYWORDS%, keyword4, keyword5, keyword6
</verbatim>

Caution: don't add meta data to your [[%WIKIUSERNAME%][home topic]] because it will override all
other meta data preferences.


-- Main.MichaelDaum - 25 Aug 2006
Topic revision: r1 - 2007-01-09 - 16:22:16 - ProjectContributor
System.NatSkinConfiguration moved from System.NatSkinCustomization on 2006-08-25 - 18:29 by MichaelDaum? - put it back
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