reanimated-color-picker/lib/module/components/InputWidget/Widgets/RgbWidget.js

A Pure JavaScript Color Picker for React Native

import React, { useRef } from 'react';
import { useDerivedValue, useSharedValue } from 'react-native-reanimated';
import colorKit from '../../../colorKit/index';
import { clamp, ConditionalRendering } from '../../../utils';
import WidgetTextInput from './WidgetTextInput';
export default function RgbWidget(props) {
  const {
    onChange,
    colorResult,
    hueValue,
    saturationValue,
    brightnessValue,
    alphaValue,
    inputStyle,
    inputTitleStyle,
    inputProps,
    disableAlphaChannel,
  } = props;
  const rgb = useRef(colorKit.RGB(colorResult().rgba).object(false));
  const r = useSharedValue(rgb.current.r.toString());
  const g = useSharedValue(rgb.current.g.toString());
  const b = useSharedValue(rgb.current.b.toString());
  const a = useSharedValue(rgb.current.a.toString());
  useDerivedValue(() => {
    const currentColor = {
      h: hueValue.value,
      s: saturationValue.value,
      v: brightnessValue.value,
      a: alphaValue.value,
    };
    rgb.current = colorKit.runOnUI().RGB(colorResult(currentColor).rgba).object(false);
    r.value = rgb.current.r.toString();
    g.value = rgb.current.g.toString();
    b.value = rgb.current.b.toString();
    a.value = rgb.current.a.toString();
  }, [hueValue, saturationValue, brightnessValue, alphaValue]); // track changes on WEB

  const onRedEndEditing = text => {
    const red = clamp(+text, 255);

    // Force update in case `r` value has not changed
    r.value = '';
    onChange({
      r: red,
      g: +g.value,
      b: +b.value,
      a: +a.value,
    });
  };
  const onGreenEndEditing = text => {
    const green = clamp(+text, 255);
    g.value = '';
    onChange({
      r: +r.value,
      g: green,
      b: +b.value,
      a: +a.value,
    });
  };
  const onBlueEndEditing = text => {
    const blue = clamp(+text, 255);
    b.value = '';
    onChange({
      r: +r.value,
      g: +g.value,
      b: blue,
      a: +a.value,
    });
  };
  const onAlphaEndEditing = text => {
    const alpha = clamp(parseFloat(text), 1);
    a.value = '';
    onChange({
      r: +r.value,
      g: +g.value,
      b: +b.value,
      a: alpha,
    });
  };
  return /*#__PURE__*/ React.createElement(
    React.Fragment,
    null,
    /*#__PURE__*/ React.createElement(WidgetTextInput, {
      inputStyle: inputStyle,
      textStyle: inputTitleStyle,
      textValue: r,
      title: 'R',
      label: 'Red channel in RGB color format',
      onEndEditing: onRedEndEditing,
      inputProps: inputProps,
    }),
    /*#__PURE__*/ React.createElement(WidgetTextInput, {
      inputStyle: inputStyle,
      textStyle: inputTitleStyle,
      textValue: g,
      title: 'G',
      label: 'Green channel in RGB color format',
      onEndEditing: onGreenEndEditing,
      inputProps: inputProps,
    }),
    /*#__PURE__*/ React.createElement(WidgetTextInput, {
      inputStyle: inputStyle,
      textStyle: inputTitleStyle,
      textValue: b,
      title: 'B',
      label: 'Blue channel in RGB color format',
      onEndEditing: onBlueEndEditing,
      inputProps: inputProps,
    }),
    /*#__PURE__*/ React.createElement(
      ConditionalRendering,
      {
        if: !disableAlphaChannel,
      },
      /*#__PURE__*/ React.createElement(WidgetTextInput, {
        inputStyle: inputStyle,
        textStyle: inputTitleStyle,
        textValue: a,
        title: 'A',
        label: 'Alpha channel in RGBA color format',
        onEndEditing: onAlphaEndEditing,
        inputProps: inputProps,
        decimal: true,
      }),
    ),
  );
}