clipper/frontend/src/ControlBar.tsx

import React from 'react';
import { PlayState } from './AppState';
import {
  CloudDownloadIcon,
  FastForwardIcon,
  PauseIcon,
  PlayIcon,
  RewindIcon,
  ZoomInIcon,
  ZoomOutIcon,
} from '@heroicons/react/solid';

interface Props {
  playState: PlayState;
  zoomInEnabled: boolean;
  zoomOutEnabled: boolean;
  onTogglePlay: () => void;
  onClip: () => void;
  onZoomIn: () => void;
  onZoomOut: () => void;
  downloadClipEnabled: boolean;
}

const ControlBar: React.FC<Props> = React.memo((props: Props) => {
  const buttonStyle =
    'bg-gray-600 hover:bg-gray-500 text-white font-bold py-2 px-4 rounded';

  const disabledButtonStyle =
    'bg-gray-700 text-white font-bold py-2 px-4 rounded cursor-auto';

  const downloadButtonStyle = props.downloadClipEnabled
    ? 'bg-green-600 hover:bg-green-600 text-white font-bold py-2 px-4 rounded absolute right-0'
    : 'bg-gray-600 hover:cursor-not-allowed text-gray-500 font-bold py-2 px-4 rounded absolute right-0';

  const iconStyle = 'inline h-7 w-7 text-white-500';

  const playPauseComponent =
    props.playState == PlayState.Playing ? (
      <PauseIcon className={iconStyle} />
    ) : (
      <PlayIcon className={iconStyle} />
    );

  const handleClip = () => {
    if (props.downloadClipEnabled) {
      props.onClip();
    }
  };

  // Detect if the space bar has been used to trigger this event, and ignore
  // it if so. This conflicts with the player interface.
  const filterMouseEvent = (evt: React.MouseEvent, cb: () => void) => {
    if (evt.detail == 0) {
      return;
    }
    cb();
  };

  return (
    <>
      <div className="relative grow-0 w-full py-2 space-x-2">
        <button className={buttonStyle}>
          <RewindIcon className={iconStyle} />
        </button>
        <button
          className={buttonStyle}
          onClick={(evt) => filterMouseEvent(evt, props.onTogglePlay)}
        >
          {playPauseComponent}
        </button>
        <button className={buttonStyle}>
          <FastForwardIcon className={iconStyle} />
        </button>
        <button
          className={props.zoomInEnabled ? buttonStyle : disabledButtonStyle}
          onClick={(evt) => filterMouseEvent(evt, props.onZoomIn)}
        >
          <ZoomInIcon className={iconStyle} />
        </button>
        <button
          className={props.zoomOutEnabled ? buttonStyle : disabledButtonStyle}
          onClick={(evt) => filterMouseEvent(evt, props.onZoomOut)}
        >
          <ZoomOutIcon className={iconStyle} />
        </button>
        <button
          className={downloadButtonStyle}
          onClick={(evt) => filterMouseEvent(evt, handleClip)}
        >
          <CloudDownloadIcon className={`${iconStyle} mr-2`} />
          Download clip as MP3
        </button>
      </div>
    </>
  );
});

ControlBar.displayName = 'ControlBar';
export { ControlBar };