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Note: build.sh updated to make sure that test:help build action:target doesn't also call test.sh by adding `:_all` meta-target. Note: CI will need a new help-keyman-com.sh build step to deploy web engine help. Fixes: #12347
66 lines
1.4 KiB
Markdown
66 lines
1.4 KiB
Markdown
---
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title: deadkeyOutput (KDO)
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---
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## Summary
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Deadkey output: Associates the [`deadkey`](/developer/language/reference/deadkey) state `dk` with the element at the current caret position, after overwriting `nd` characters.
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## Syntax
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```c
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keyman.interface.deadkeyOutput(nd, Pelem, dk);
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```
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or
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```c
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KeymanWeb.KDO(nd, Pelem, dk); // Shorthand
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```
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### Parameters
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`nd`
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: Type: `number`
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: The number of characters to overwrite (delete). May be set to `-1` or `0` to prevent overwrites.
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`Pelem`
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: Type: `Element`
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: The element receiving output.
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`dk`
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: Type: `number`
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: The deadkey id.
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### Return Value
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`undefined`
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## Description
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Deadkeys are useful for tracking hidden state information used to modify future keystrokes. For example, rather than using
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```keyman
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"`" + "a" = "à"
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```
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to combine two visible characters, certain applications may desire to keep the `` "`" `` character hidden with a rule such as
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```keyman
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+ '`' > dk(backquote)
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...
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dk(backquote) + "a" > "à"
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```
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The Developer compiler then generates a unique id for the deadkey state - say, `0`, and upon detecting input of the `` '`' `` character with the [`keyman.interface.deadkeyMatch()`](deadkeyMatch) function, compiles the deadkey generation to
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```c
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keyman.interface.deadkeyOutput(0, Pelem, 0);
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```
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## See also
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- [`keyman.interface.deadkeyMatch()`](deadkeyMatch)
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- [Wikipedia article on deadkeys](https://en.wikipedia.org/wiki/Dead_key)
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