RangeKeyboardFixture.js — react Source File

Source Code

import Fixture from '../../Fixture';
const React = window.React;

class RangeKeyboardFixture extends React.Component {
  constructor(props, context) {
    super(props, context);

    this.state = {
      keydownCount: 0,
      changeCount: 0,
    };
  }

  componentDidMount() {
    this.input.addEventListener('keydown', this.handleKeydown, false);
  }

  componentWillUnmount() {
    this.input.removeEventListener('keydown', this.handleKeydown, false);
  }

  handleChange = () => {
    this.setState(({changeCount}) => {
      return {
        changeCount: changeCount + 1,
      };
    });
  };

  handleKeydown = e => {
    // only interesting in arrow key events
    if ([37, 38, 39, 40].indexOf(e.keyCode) < 0) {
      return;
    }

    this.setState(({keydownCount}) => {
      return {
        keydownCount: keydownCount + 1,
      };
    });
  };

  handleReset = () => {
    this.setState({
      keydownCount: 0,
      changeCount: 0,
    });
  };

  render() {
    const {keydownCount, changeCount} = this.state;
    const color = keydownCount === changeCount ? 'green' : 'red';

    return (
      <Fixture>
        <div>
          <input
            type="range"
            ref={r => (this.input = r)}
            onChange={this.handleChange}
          />
          <button onClick={() => this.input.focus()}>Focus Knob</button>
        </div>{' '}
        <p style={{color}}>
          <code>onKeyDown</code>
          {' calls: '}
          <strong>{keydownCount}</strong>
          {' vs '}
          <code>onChange</code>
          {' calls: '}
          <strong>{changeCount}</strong>
        </p>
        <button onClick={this.handleReset}>Reset counts</button>
      </Fixture>
    );
  }
}

export default RangeKeyboardFixture;