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82 lines
2.8 KiB
Plaintext
82 lines
2.8 KiB
Plaintext
created: 20221007144237585
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modified: 20230921180332436
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tags: Concepts Reference
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title: Custom Widgets
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type: text/vnd.tiddlywiki
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!! Introduction
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<<.from-version "5.3.0">> A <<.def "custom widget">> is a special kind of [[procedure|Procedures]] that can be called using the same syntax as widgets.
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Custom widgets can also be used to override built-in JavaScript widgets to customise their behaviour.
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!! Defining Custom Widgets
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Custom widgets are usually defined with the [[Pragma: \widget]]:
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```
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\widget $my.widget(attribute:"Default value")
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This is the widget, and the attribute is <<attribute>>.
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\end
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```
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The name of the widget must start with a dollar sign. If it is a user defined widget that does not override an existing widget then it must include at least one period (dot) within the name (for example `$my.widget` or `$acme.logger`).
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Note that the [[Pragma: \whitespace]] setting is inherited from the parsing context in which the procedure definition occurs. That means that a tiddler containing multiple procedure definitions only needs a single whitespace pragma at the top of the tiddler, and the setting will be automatically inherited by the procedure definitions without needing the pragma to be repeated.
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!! Using Custom Widgets
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Custom widgets are called in the same way as ordinary built-in widgets:
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```
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<$my.widget/>
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<$my.widget attribute="The parameter"/>
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```
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The attributes that are specified in the widget call are made available as parameter variables.
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!! Accessing Content of Custom Widgets
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Within the definition of a custom widget the content of the calling widget is available via the `<$slot $name="ts-raw"/>` widget. The contents of the <<.wlink SlotWidget>> widget is used as the default content if the widget was called without any content.
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For example:
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<<wikitext-example-without-html """\widget $my.widget(one:'Jaguar')
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<$text text=<<one>>/>
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<$slot $name="ts-raw">
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Whale
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</$slot>
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\end
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<$my.widget one="Dingo">
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Crocodile
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</$my.widget>
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<$my.widget/>""">>
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!! How Custom Widgets Work
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Custom widgets are implemented as a special kind of [[variable|Variables]]. The only thing that distinguishes them from ordinary variables is the way that they can be called as a custom widget with attributes mapped to parameters.
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!! Overriding Core ~JavaScript Widgets
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Custom widgets can use the <<.wlink "GenesisWidget">> widget to invoke the original widget, bypassing the override. For example, here we override the <<.wlink CodeBlockWidget>> widget to add `≤≥` symbols around each string of text.
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<<wikitext-example-without-html """\widget $codeblock(code)
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<$genesis $type="$codeblock" $remappable="no" code={{{ [<code>addprefix[≤]addsuffix[≥]] }}}/>
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\end
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<$codeblock code="Kangaroo"/>
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<$codeblock code={{$:/SiteTitle}}/>
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```
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Python
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```
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<$let test="Tiger">
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<$codeblock code=<<test>>/>
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</$let>""">>
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