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Astrid Elocson 2014-12-28 09:50:19 +00:00
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editions/tw5.com/tiddlers/concepts/ColourPalettes.tid
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@ -4,40 +4,29 @@ tags: Concepts
title: ColourPalettes
type: text/vnd.tiddlywiki
Colour palettes bind logical colour names (such as ''page-background'') to actual CSS colours (such as ''#fe0'').
A colour palette is a [[data tiddler|DataTiddlers]] that supplies a [[CSS]] colour value, such as ''yellow'' or ''#fe0'', for each of several colour names, like this:
Entire colour palettes are stored in a single [[data tiddler|DataTiddlers]].
```
page-background: #fe0
table-border: #ccc
...
```
The title of the tiddler containing the current colour palette is identified by the tiddler [[$:/palette]].
Several palettes form part of the core. The system tiddler [[$:/palette]] always contains the title of the currently selected palette tiddler.
To retrieve a named colour from the current palette you can use the ''colour'' macro:
To retrieve the value of a named colour from the current palette, e.g. for use in a stylesheet tiddler, use the [[colour macro|$:/core/macros/CSS]]:
```
<<colour page-background>>
```
The ''colour'' macro is defined like this:
```
\define colour(name)
<$transclude tiddler={{$:/palette}} index="$name$"/>
\end
```
By convention, each theme provides a default colour palette in the tiddler [[$:/config/DefaultPalette]] tiddler. Thus, setting the tiddler [[$:/theme]] to the string `$:/config/DefaultPalette` will revert to the palette packaged with the current theme (as long as it hasn't been redefined, since it is a shadow tiddler).
Palette tiddlers should have the following fields:
|!Field |!Description |
|title |Any title can be used, typically a system title starting with "$:/" |
|type |`application/x-tiddler-dictionary` to identify this tiddler as a [[data tiddler|DataTiddlers]] |
|tags |`$:/tags/Palette` to identify this tiddler as a palette |
|description |Description to be displayed in palette browser |
|text |Colour definitions (see below) |
|!Name |!Value |
|title |Typically starting with `$:/` |
|type |`application/x-tiddler-dictionary` |
|tags |`$:/tags/Palette` |
|description |Displayed in the palette browser |
|text |`name: value` colour definitions |
The text of a palette tiddler consists of name value pairs like this:
```
foreground: #000
background: #fff
```
By convention, each [[theme|Themes]] provides a default colour palette in the tiddler [[$:/config/DefaultPalette]]. Thus, setting the tiddler [[$:/theme]] to the string `$:/config/DefaultPalette` will revert to the palette packaged with the current theme (as long as it hasn't been redefined, since it is a shadow tiddler).