mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-12-26 18:10:27 +00:00
76 lines
3.4 KiB
Plaintext
76 lines
3.4 KiB
Plaintext
chapter.of: UI and Rendering Pipeline
|
|
created: 20140717174825427
|
|
modified: 20140717181845115
|
|
sub.num: 4
|
|
tags: doc
|
|
title: Transclusion and TextReference
|
|
|
|
The previous parts about [[Widgets]] and the [[Parser]] explained how a block of WikiText is transformed into a DOM representation and how this presentation can react on changes to the wiki store.
|
|
The previous chapters also describe that WikiText is saved in individual tiddlers, including the WikiText describing the UI components.
|
|
This raises the question, how these multiple tiddlers are build up to a single UI.
|
|
But before answering this question we need to introduce text references and transclusion.
|
|
|
|
!!! ~TextReference
|
|
A text reference describes a special notation to indirectly refer to the contents of a specified tiddler field.
|
|
The syntax of a text reference is:
|
|
|
|
```
|
|
<tiddlertitle>
|
|
<tiddlertitle>!!<fieldname>
|
|
!!<fieldname> - specifies a field of the current tiddlers
|
|
```
|
|
|
|
To obtain the actual text, the core plug-in adds a function to the wiki store ``getTextReference(textRef,defaultText,currTiddlerTitle)``. The "currentTiddlerTitle" is the title of a tiddler which is used when no tiddlerTitle is specified in the text reference.
|
|
What the currentTiddler should be, depends on where the text reference is used.
|
|
If it is for example used as a widget attribute, the current tiddler is the tiddler which contains this widget.
|
|
Text references are used by widgets (attributes), filteroperators (parameter) and in transclusions.
|
|
These elements use the ``getTextReference(textRef,defaultText,currTiddlerTitle)`` function.
|
|
|
|
!!! Transclusion
|
|
|
|
Transclusion means including the contents of a different tiddler.
|
|
This is realized with a transclude widget which parses the tiddler to be included and adds the resulting nodes as children of its own parse node.
|
|
The trick with transclusion is, that it shows the content of a different tiddler but by default it does not change the current tiddler.
|
|
This enables us to create tiddlers with text references and use them as a templates.
|
|
|
|
For example:
|
|
Tiddler ``MyTask`` having the fields and the content of:
|
|
|
|
```
|
|
important: "very"
|
|
assoc.person: "Hans Dampf"
|
|
|
|
<$transclude tiddler="TaskHeaderTemplate" />
|
|
|
|
Hans needs some more Dampf.
|
|
```
|
|
|
|
And Tiddler ``TaskHeaderTemplate`` with a content of:
|
|
|
|
```
|
|
<$view field="assoc.person"/> has a <$view field="important"/> important task for us:
|
|
```
|
|
|
|
When showing tiddler ``MyTask`` it would result in:
|
|
|
|
```
|
|
Hans Dampf has a very important task for us:
|
|
|
|
Hans needs some more Dampf.
|
|
```
|
|
|
|
Transclusion and templates is one of the most important concepts in TiddlyWiki.
|
|
It allows us to include other tiddlers using the metadata for our current tiddler.
|
|
It also allows us to transclude a template tiddler with a third tiddler set as the currentTiddler with the ~TiddlerWidget:
|
|
|
|
```
|
|
<$tiddler tiddler="MyTiddler">
|
|
<$transclude tiddler="EditTemplate" />
|
|
</$tiddler>
|
|
```
|
|
|
|
This way we can create a different view on a tiddler which does not only show it's title and it's content
|
|
but shows it's content and metadata in editable text fields and allows us to edit this tiddler.
|
|
Also the template concept is used by the ~ListWidget to show the tiddlers through a specified template.
|
|
Finally, when wanting to download the wiki as a new html file, this html file is created by binding a list of all tiddlers to a template and sending the resulting text to the syncer module described in [[Extended Persistence]] to save the current wiki.
|