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33 lines
1.9 KiB
Plaintext
33 lines
1.9 KiB
Plaintext
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chapter.of: UI and Rendering Pipeline
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created: 20140717174307709
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modified: 20140717181543163
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sub.num: 3
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tags: doc
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title: Widgets
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When the WikiText has been transformed into a parse-tree the next step is to transform this parse-tree into a widget-tree.
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We talked about widgets as parts of the WikiText markup but in fact each node of the parse-tree is transformed to a widget object.
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The core plug-in provides a basic widget object which gets the parse node it should represent and a DOM node. The widget then must create the DOM structure which represents the parse node and add it to the provided DOM node.
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A ~LinkWidget for example would create the DOM node for a ``<a>...</a>`` tag and put it in the provided DOM node.
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When a widget gets a parse node with child nodes it must create the corresponding child widgets.
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All this functionality is basically provided with the base widget. But when creating the widget for a parse node it loads additional modules with ``module-type: widget``. These modules can export multiple widgets which extend the base widget and can override it's methods like the rendering and refresh functions.
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As described in [[Parser]] each parse node contains a "type" property. This type directly determines which widget module is used.
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```
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{type: "text", text: <string>} - a text node
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```
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Would be transformed to a [[TextWidget|$:/core/modules/widgets/text.js]].
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(Note that the ~TextWidget module exports a property "text".)
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So in fact when talking about widgets in WikiText, they are not a feature added to WikiText but the ability to directly use a specific widget instead of the parser choosing a widget type.
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In the beginning we talked about widgets and how they enable dynamic behaviour. But up until now we only described how widgets create DOM nodes from parse nodes.
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Widgets add dynamic behaviour in two ways.
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<$list filter="[!has[draft.of]has[chapter.of]chapter.of[Widgets]tag[doc]sort[sub.num]]">
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!!! <$view field="title"/>
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{{!!text}}
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</$list>
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