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60 lines
2.9 KiB
Plaintext
60 lines
2.9 KiB
Plaintext
caption: keyboard
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created: 20140302192136805
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modified: 20211009121239821
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tags: Widgets TriggeringWidgets
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title: KeyboardWidget
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type: text/vnd.tiddlywiki
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! Introduction
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The keyboard widget allows ActionWidgets to be triggered by specific key combinations. There is also a shorthand for generating [[Messages]] via the `message` and `param` attributes.
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! Content and Attributes
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The content of the `<$keyboard>` widget is rendered normally. The keyboard shortcuts only take effect when the focus is within the contained content.
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|!Attribute |!Description |
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|actions |A string containing ActionWidgets to be triggered when the key combination is detected<br><<.from-version "5.2.0">> The variables: ''event-key'', ''event-code'' and ''modifier'' are available for the actions |
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|message |The title of the [[WidgetMessage|Messages]] to generate |
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|param |The parameter to be passed with the [[WidgetMessage|Messages]] |
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|key |Key string identifying the key(s) to be trapped (see below) |
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|class |A CSS class to be assigned to the generated HTML DIV element |
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|tag|<<.from-version "5.1.14">> The html element the widget creates to capture the keyboard event, defaults to:<br>» `span` when parsed in inline-mode<br>» `div` when parsed in block-mode|
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! Variables
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<<.from-version "5.2.0">> The following variables are made available to the actions:
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|!Variables |!Description |
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|`event-key` |The <<.var event-key>> variable contains the character, if possible. eg: `1`. You can experiment with some settings at: [[Key Codes (Example)]] |
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|`event-code` |The <<.var event-code>> variable contains a character description. eg: `Digit1` instead of `1`. Or `Space` instead of an empty string ` `, which is hard to see|
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|`event-key-descriptor` |The <<.var event-key-descriptor>> variable is available if the keyboard event captured was configured using a [[keyboard shortcut descriptor|Keyboard Shortcut Descriptor]] of the form `((my-shortcut))` which references a configuration tiddler. |
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|`modifier` |The [[modifier Variable]] contains the Modifier Key held during the event (can be <kbd>normal</kbd>, <kbd>ctrl</kbd>, <kbd>shift</kbd>, <kbd>alt</kbd> or combinations thereof) |
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! Key Strings
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Key strings are made up of one or more key specifiers separated by spaces. Each key specifier is zero or more of the modifiers <kbd>alt</kbd>, <kbd>shift</kbd>, <kbd>ctrl</kbd> or <kbd>meta</kbd> followed by the name of a key, all joined with "+" plus or "-" minus symbols. Key names are either the letter or digit printed on the key (eg "a" or "1"), or one of the special keys <kbd>backspace</kbd>, <kbd>tab</kbd>, <kbd>enter</kbd> or <kbd>escape</kbd>.
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<$railroad text="""
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[: {
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("alt" | "shift" | "ctrl" |: "meta" ) +("+" | "-")
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}
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"+"
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]
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( "<a-z,0-9>" | "backspace" |: "tab" | "enter" | "escape" )
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"""/>
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For example:
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```
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A
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shift+A
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shift+escape
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ctrl+enter
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ctrl+shift+alt+A
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```
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! More Info
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<<list-links "[tag[KeyboardWidget]]">>
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