lbry-desktop/ui/component/spinner/view.jsx

// @flow
import React, { PureComponent } from 'react';
import classnames from 'classnames';
import { DARK_THEME, LIGHT_THEME } from 'constants/themes';

type Props = {
  dark?: boolean, // always a dark spinner
  light?: boolean, // always a light spinner
  theme: string,
  type: ?string,
  delayed: boolean,
};

type State = {
  show: boolean,
};

class Spinner extends PureComponent<Props, State> {
  static defaultProps = {
    // We may want a dark/light spinner regardless of the current theme
    dark: false,
    light: false,
    delayed: false,
  };

  constructor() {
    super();

    this.state = { show: false };
    this.delayedTimeout = null;
  }

  componentDidMount() {
    const { delayed } = this.props;
    if (!delayed) {
      // We can disable this because the default state is to render nothing so there won't be any content thrashing
      this.setState({ show: true });
    } else {
      // If the delayed prop is passed in, wait some time before showing the loading indicator
      // We don't want the spinner to just flash for a fraction of a second
      this.delayedTimeout = setTimeout(() => {
        this.setState({ show: true });
      }, 750);
    }
  }

  componentWillUnmount() {
    if (this.delayedTimeout) {
      clearTimeout(this.delayedTimeout);
      this.delayedTimeout = null;
    }
  }

  delayedTimeout: ?TimeoutID;

  render() {
    const { dark, light, theme, type } = this.props;
    const { show } = this.state;

    if (!show) {
      return null;
    }

    return (
      <div
        className={classnames('spinner', {
          'spinner--dark': !light && (dark || theme === LIGHT_THEME),
          'spinner--light': !dark && (light || theme === DARK_THEME),
          'spinner--small': type === 'small',
          'spinner--splash': type === 'splash',
        })}
      >
        <div className="rect rect1" />
        <div className="rect rect2" />
        <div className="rect rect3" />
        <div className="rect rect4" />
        <div className="rect rect5" />
      </div>
    );
  }
}

export default Spinner;