redux-devtools/packages/redux-devtools-ui/src/Slider/Slider.tsx

import React, { Component } from 'react';
import PropTypes from 'prop-types';
import { Base16Theme } from 'base16';
import createStyledComponent from '../utils/createStyledComponent';
import * as styles from './styles';
import { containerStyle } from './styles/common';

const SliderWrapper = createStyledComponent(styles);
const ContainerWithValue = createStyledComponent(containerStyle);

export interface SliderProps {
  value: number;
  min: number;
  max: number;
  label?: string;
  sublabel?: string;
  withValue?: boolean;
  disabled?: boolean;
  onChange: (value: number) => void;
  theme?: Base16Theme;
}

export default class Slider extends Component<SliderProps> {
  shouldComponentUpdate(nextProps: SliderProps) {
    return (
      nextProps.label !== this.props.label ||
      nextProps.value !== this.props.value ||
      nextProps.max !== this.props.max ||
      nextProps.min !== this.props.min ||
      nextProps.withValue !== this.props.withValue ||
      nextProps.disabled !== this.props.disabled
    );
  }

  onChange: React.ChangeEventHandler<HTMLInputElement> = (e) => {
    this.props.onChange(parseFloat(e.target.value));
  };

  render() {
    const { label, sublabel, withValue, theme, ...rest } = this.props;
    const { value, max, min, disabled } = rest;
    const absMax = max - min;
    const percent = ((value - min) / absMax) * 100;
    const slider = <input {...rest} onChange={this.onChange} type="range" />;

    return (
      <SliderWrapper
        percent={percent}
        disabled={disabled || absMax === 0}
        withLabel={!!label}
        theme={theme}
      >
        {label && (
          <label>
            {label} {sublabel && <span>{sublabel}</span>}
          </label>
        )}
        {!withValue ? (
          slider
        ) : (
          <ContainerWithValue theme={theme}>
            {slider}
            <div>{value}</div>
          </ContainerWithValue>
        )}
      </SliderWrapper>
    );
  }

  static propTypes = {
    value: PropTypes.number,
    min: PropTypes.number,
    max: PropTypes.number,
    label: PropTypes.string,
    sublabel: PropTypes.string,
    withValue: PropTypes.bool,
    disabled: PropTypes.bool,
    onChange: PropTypes.func,
    theme: PropTypes.object,
  };

  static defaultProps = { value: 0, min: 0, max: 100 };
}