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Merge pull request #1293 from aelocson/patch-3

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Improvements to wording
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Jeremy Ruston 2014-12-30 18:42:03 +00:00
commit 8707d51b7d
6 changed files with 67 additions and 59 deletions
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41
editions/tw5.com/tiddlers/concepts/ColourPalettes.tid
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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).

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editions/tw5.com/tiddlers/concepts/CurrentTiddler.tid
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title: CurrentTiddler
type: text/vnd.tiddlywiki
The CurrentTiddler is the current tiddler during WikiText rendering. It is usually set by the TiddlerWidget. It allows you to write references like `<$view field="title"/>` in TemplateTiddlers without explicitly specifying the tiddler that it applies to.
The current tiddler provides an ever-changing context or background against which several features of WikiText are interpreted.
The title of the current tiddler is contained in the [[WidgetVariable: currentTiddler]].
For example, `{{!!title}}` denotes the value of the ''title'' field of whatever the current tiddler happens to be. This technique can be used in a [[TemplateTiddler|TemplateTiddlers]] to keep the template generic.
The title of the current tiddler can always be found in the [[currentTiddler variable|WidgetVariable: currentTiddler]].
The current tiddler is set in several ways, including by the ListWidget and the TiddlerWidget.

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editions/tw5.com/tiddlers/concepts/DataTiddlers.tid
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tags: Concepts
title: DataTiddlers
Data tiddlers provide a way to access blocks of [[JSON]] data within the `text` field of a tiddler.
A data tiddler is a miniature database contained within a tiddler.
//The implementation of data tiddlers is preliminary, with some intentional limitations.//
There are two standard formats:
! Data tiddler format
* DictionaryTiddlers
* [[JSONTiddlers]]
A native data tiddler must have:
Other formats of tiddler can also be parsed to yield blocks of data that behave like data tiddlers.
* The ContentType field `type` set to `application/json`
* Valid JSON data in the `text` field
For example, the [[history list|$:/HistoryList]] tiddler is a data tiddler.
Other tiddler types with alternative formats can also be parsed to yield a block of data that behaves like a data tiddler.
!! Tiddler dictionary format
The tiddler dictionary format is an alternative syntax for data tiddlers:
* The ContentType field `type` is set to `application/x-tiddler-dictionary`
* The `text` field consists of one or more lines of the form `<name>:<value>`
For example, palettes such as the [[default Vanilla palette|$:/palettes/Vanilla]] are tiddler dictionaries.
! Accessing data within data tiddlers
Currently, it is only possible to access the top level properties of the data using TextReference syntax.
For example, given a `application/json` tiddler containing:
Use a TextReference to look up a value by its name. For example, if a [[DictionaryTiddler|DictionaryTiddlers]] called `MonthDays` contains:
```
{"a":"one","b":"two","c":"three"}
oct:31
nov:30
dec:31
```
Or the equivalent tiddler dictionary of type `application/x-tiddler-dictionary`:
... then `{{MonthDays##nov}}` will resolve to the value `30`.
The same is true if `MonthDays` is a [[JSONTiddler|JSONTiddlers]] with the following content:
```
a:one
b:two
c:three
{"oct":31,"nov":30,"dec":31}
```
With either of those definitions `{{TiddlerTitle##b}}` would have the value `two`.
Note: //It is currently only possible to retrieve data from the immediate properties of the root object of a JSONTiddler.//

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editions/tw5.com/tiddlers/concepts/DictionaryTiddlers.tid Normal file
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created: 20141228094500000
modified: 20141228094500000
tags: Concepts
title: DictionaryTiddlers
A dictionary tiddler is a [[data tiddler|DataTiddlers]] containing a simple list of name/value pairs.
Its [[ContentType]] is `application/x-tiddler-dictionary`.
The `text` field consists of one or more lines of the form <code>//name//: //value//</code>.
[[ColourPalettes]], such as the [[default Vanilla palette|$:/palettes/Vanilla]], are dictionary tiddlers.

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editions/tw5.com/tiddlers/concepts/JSONTiddlers.tid Normal file
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created: 20141228094500000
modified: 20141228094500000
tags: Concepts
title: JSONTiddlers
A JSON tiddler is a [[data tiddler|DataTiddlers]] containing a [[JSON]] structure in its `text` field.
Its [[ContentType]] is `application/json`.
The [[history list|$:/HistoryList]] is a good example of a JSON tiddler.

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editions/tw5.com/tiddlers/concepts/TagTiddlers.tid Normal file
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created: 20141228094500000
modified: 20141228094500000
tags: Concepts
title: TagTiddlers
A tag tiddler is any tiddler that is in use as a tag.
The ''Tagging'' tab on the InfoPanel of a tag tiddler shows which tiddlers are tagged with the tag tiddler.
A tag can be used without a corresponding tag tiddler.