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76 lines
3.4 KiB
Plaintext
76 lines
3.4 KiB
Plaintext
chapter.of: UI and Rendering Pipeline
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created: 20140717174825427
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modified: 20140717181845115
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sub.num: 4
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tags: doc
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title: Transclusion and TextReference
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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.
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The previous chapters also describe that WikiText is saved in individual tiddlers, including the WikiText describing the UI components.
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This raises the question, how these multiple tiddlers are build up to a single UI.
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But before answering this question we need to introduce text references and transclusion.
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!!! ~TextReference
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A text reference describes a special notation to indirectly refer to the contents of a specified tiddler field.
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The syntax of a text reference is:
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```
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<tiddlertitle>
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<tiddlertitle>!!<fieldname>
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!!<fieldname> - specifies a field of the current tiddlers
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```
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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.
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What the currentTiddler should be, depends on where the text reference is used.
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If it is for example used as a widget attribute, the current tiddler is the tiddler which contains this widget.
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Text references are used by widgets (attributes), filteroperators (parameter) and in transclusions.
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These elements use the ``getTextReference(textRef,defaultText,currTiddlerTitle)`` function.
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!!! Transclusion
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Transclusion means including the contents of a different tiddler.
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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.
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The trick with transclusion is, that it shows the content of a different tiddler but by default it does not change the current tiddler.
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This enables us to create tiddlers with text references and use them as a templates.
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For example:
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Tiddler ``MyTask`` having the fields and the content of:
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```
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important: "very"
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assoc.person: "Hans Dampf"
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<$transclude tiddler="TaskHeaderTemplate" />
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Hans needs some more Dampf.
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```
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And Tiddler ``TaskHeaderTemplate`` with a content of:
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```
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<$view field="assoc.person"/> has a <$view field="important"/> important task for us:
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```
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When showing tiddler ``MyTask`` it would result in:
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```
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Hans Dampf has a very important task for us:
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Hans needs some more Dampf.
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```
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Transclusion and templates is one of the most important concepts in TiddlyWiki.
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It allows us to include other tiddlers using the metadata for our current tiddler.
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It also allows us to transclude a template tiddler with a third tiddler set as the currentTiddler with the ~TiddlerWidget:
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```
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<$tiddler tiddler="MyTiddler">
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<$transclude tiddler="EditTemplate" />
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</$tiddler>
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```
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This way we can create a different view on a tiddler which does not only show it's title and it's content
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but shows it's content and metadata in editable text fields and allows us to edit this tiddler.
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Also the template concept is used by the ~ListWidget to show the tiddlers through a specified template.
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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.
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