20 lines
1.3 KiB
Plaintext
20 lines
1.3 KiB
Plaintext
created: 20140908130500000
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modified: 20150219182745000
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tags: Concepts Reference
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title: Widgets
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type: text/vnd.tiddlywiki
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~TiddlyWiki's display is driven by an underlying collection of <<.def widgets>>. These are organised into a tree structure: each widget has a parent widget and zero or more child widgets.
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~TiddlyWiki generates this <<.def "widget tree">> by parsing the WikiText of tiddlers. Each component of the WikiText syntax, including even the trivial case of ordinary text, generates a corresponding widget. The widget tree is an intermediate representation that is subsequently rendered into the actual display.
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Widgets are analogous to elements in an HTML document. Indeed, HTML tags in WikiText generate dedicated <<.def "element widgets">>.
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Each class of widget contributes a specific ability to the overall functionality, such as the ability to <<.wlink2 "display an image" ImageWidget>> or <<.wlink2 "a button" ButtonWidget>>, to <<.wlink2 "call a macro" MacroCallWidget>> or <<.wlink2 "transclude text from elsewhere" TranscludeWidget>>, or to [[mark a piece of text as a heading|HTML in WikiText]].
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The more specialised widgets use a general-purpose [[widget syntax|Widgets in WikiText]] as their only possible WikiText representation.
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The following classes of widget are built into the core:
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<<list-links "[tag[Widgets]]">>
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