Derived — Kuito Documentation

Usage

Dismiss and observe the keyboard

This type is used by keyboard.frame

tsx

import { Box, Button, Text, VStack, keyboard } from 'kuito';

export default function KeyboardState() {
  keyboard.frame.value; // { screenX, screenY, width, height } or null

  // In a component, until it unmounts; elsewhere, until remove().
  keyboard.watch('didShow', (event) => console.log(event.frame.height, event.duration));

  return (
    <VStack>
      <Text>{keyboard.visible.value ? 'typing' : ''}</Text>
      {/* Rides on the keyboard. */}
      <Box translateY={keyboard.height.map((height) => -height)} />
      <Button onPress={() => keyboard.dismiss()}>Done</Button>
    </VStack>
  );
}

Type declaration

export interface Derived<T> extends Readable<T> {
  readonly __kuitoDerived: DerivedSpec;
  /** A value computed from this one, on the UI thread. */
  map<U>(fn: (value: T) => U): Derived<U>;
}

Members 2

Name	Type	Required	Description
`map`	`<U>(fn: (value: T) => U) => Derived<U>`	Yes	A value computed from this one, on the UI thread.
`value`readonly	`T`	Yes	—

map — method signatures

Signatures

<U>(fn: (value: T) => U): Derived<U>

Type parameters

Name	Constraint	Default
`U`	—	—

Parameters

Name	Type	Required	Description
`fn`	`(value: T) => U`	Yes	—

Returns

Derived<U>

Generated from the public TypeScript declarations: signatures, props and defaults come from the checked source, descriptions from its JSDoc. No defaults are invented.