1 files changed, 236 insertions, 0 deletions
diff --git a/app/javascript/flavours/glitch/features/audio/index.js b/app/javascript/flavours/glitch/features/audio/index.js
new file mode 100644
index 000000000..033d92adf
--- /dev/null
+++ b/app/javascript/flavours/glitch/features/audio/index.js
@@ -0,0 +1,236 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import WaveSurfer from 'wavesurfer.js';
+import { defineMessages, injectIntl } from 'react-intl';
+import { formatTime } from 'flavours/glitch/features/video';
+import Icon from 'flavours/glitch/components/icon';
+import classNames from 'classnames';
+import { throttle } from 'lodash';
+
+const messages = defineMessages({
+  play: { id: 'video.play', defaultMessage: 'Play' },
+  pause: { id: 'video.pause', defaultMessage: 'Pause' },
+  mute: { id: 'video.mute', defaultMessage: 'Mute sound' },
+  unmute: { id: 'video.unmute', defaultMessage: 'Unmute sound' },
+  download: { id: 'video.download', defaultMessage: 'Download file' },
+});
+
+export default @injectIntl
+class Audio extends React.PureComponent {
+
+  static propTypes = {
+    src: PropTypes.string.isRequired,
+    alt: PropTypes.string,
+    duration: PropTypes.number,
+    peaks: PropTypes.arrayOf(PropTypes.number),
+    height: PropTypes.number,
+    preload: PropTypes.bool,
+    editable: PropTypes.bool,
+    intl: PropTypes.object.isRequired,
+  };
+
+  state = {
+    currentTime: 0,
+    duration: null,
+    paused: true,
+    muted: false,
+    volume: 0.5,
+  };
+
+  // hard coded in components.scss
+  // any way to get ::before values programatically?
+
+  volWidth = 50;
+
+  volOffset = 70;
+
+  volHandleOffset = v => {
+    const offset = v * this.volWidth + this.volOffset;
+    return (offset > 110) ? 110 : offset;
+  }
+
+  setVolumeRef = c => {
+    this.volume = c;
+  }
+
+  setWaveformRef = c => {
+    this.waveform = c;
+  }
+
+  componentDidMount () {
+    if (this.waveform) {
+      this._updateWaveform();
+    }
+  }
+
+  componentDidUpdate (prevProps) {
+    if (this.waveform && prevProps.src !== this.props.src) {
+      this._updateWaveform();
+    }
+  }
+
+  componentWillUnmount () {
+    if (this.wavesurfer) {
+      this.wavesurfer.destroy();
+      this.wavesurfer = null;
+    }
+  }
+
+  _updateWaveform () {
+    const { src, height, duration, peaks, preload } = this.props;
+
+    const progressColor = window.getComputedStyle(document.querySelector('.audio-player__progress-placeholder')).getPropertyValue('background-color');
+    const waveColor     = window.getComputedStyle(document.querySelector('.audio-player__wave-placeholder')).getPropertyValue('background-color');
+
+    if (this.wavesurfer) {
+      this.wavesurfer.destroy();
+      this.loaded = false;
+    }
+
+    const wavesurfer = WaveSurfer.create({
+      container: this.waveform,
+      height,
+      barWidth: 3,
+      cursorWidth: 0,
+      progressColor,
+      waveColor,
+      backend: 'MediaElement',
+      interact: preload,
+    });
+
+    wavesurfer.setVolume(this.state.volume);
+
+    if (preload) {
+      wavesurfer.load(src);
+      this.loaded = true;
+    } else {
+      wavesurfer.load(src, peaks, 'none', duration);
+      this.loaded = false;
+    }
+
+    wavesurfer.on('ready', () => this.setState({ duration: Math.floor(wavesurfer.getDuration()) }));
+    wavesurfer.on('audioprocess', () => this.setState({ currentTime: Math.floor(wavesurfer.getCurrentTime()) }));
+    wavesurfer.on('pause', () => this.setState({ paused: true }));
+    wavesurfer.on('play', () => this.setState({ paused: false }));
+    wavesurfer.on('volume', volume => this.setState({ volume }));
+    wavesurfer.on('mute', muted => this.setState({ muted }));
+
+    this.wavesurfer = wavesurfer;
+  }
+
+  togglePlay = () => {
+    if (this.state.paused) {
+      if (!this.props.preload && !this.loaded) {
+        this.wavesurfer.createBackend();
+        this.wavesurfer.createPeakCache();
+        this.wavesurfer.load(this.props.src);
+        this.wavesurfer.toggleInteraction();
+        this.loaded = true;
+      }
+
+      this.wavesurfer.play();
+      this.setState({ paused: false });
+    } else {
+      this.wavesurfer.pause();
+      this.setState({ paused: true });
+    }
+  }
+
+  toggleMute = () => {
+    this.wavesurfer.setMute(!this.state.muted);
+  }
+
+  handleVolumeMouseDown = e => {
+    document.addEventListener('mousemove', this.handleMouseVolSlide, true);
+    document.addEventListener('mouseup', this.handleVolumeMouseUp, true);
+    document.addEventListener('touchmove', this.handleMouseVolSlide, true);
+    document.addEventListener('touchend', this.handleVolumeMouseUp, true);
+
+    this.handleMouseVolSlide(e);
+
+    e.preventDefault();
+    e.stopPropagation();
+  }
+
+  handleVolumeMouseUp = () => {
+    document.removeEventListener('mousemove', this.handleMouseVolSlide, true);
+    document.removeEventListener('mouseup', this.handleVolumeMouseUp, true);
+    document.removeEventListener('touchmove', this.handleMouseVolSlide, true);
+    document.removeEventListener('touchend', this.handleVolumeMouseUp, true);
+  }
+
+  handleMouseVolSlide = throttle(e => {
+    const rect = this.volume.getBoundingClientRect();
+    const x    = (e.clientX - rect.left) / this.volWidth; // x position within the element.
+
+    if(!isNaN(x)) {
+      let slideamt = x;
+
+      if (x > 1) {
+        slideamt = 1;
+      } else if(x < 0) {
+        slideamt = 0;
+      }
+
+      this.wavesurfer.setVolume(slideamt);
+    }
+  }, 60);
+
+  render () {
+    const { height, intl, alt, editable } = this.props;
+    const { paused, muted, volume, currentTime } = this.state;
+
+    const volumeWidth     = muted ? 0 : volume * this.volWidth;
+    const volumeHandleLoc = muted ? this.volHandleOffset(0) : this.volHandleOffset(volume);
+
+    return (
+      <div className={classNames('audio-player', { editable })}>
+        <div className='audio-player__progress-placeholder' style={{ display: 'none' }} />
+        <div className='audio-player__wave-placeholder' style={{ display: 'none' }} />
+
+        <div
+          className='audio-player__waveform'
+          aria-label={alt}
+          title={alt}
+          style={{ height }}
+          ref={this.setWaveformRef}
+        />
+
+        <div className='video-player__controls active'>
+          <div className='video-player__buttons-bar'>
+            <div className='video-player__buttons left'>
+              <button type='button' aria-label={intl.formatMessage(paused ? messages.play : messages.pause)} onClick={this.togglePlay}><Icon id={paused ? 'play' : 'pause'} fixedWidth /></button>
+              <button type='button' aria-label={intl.formatMessage(muted ? messages.unmute : messages.mute)} onClick={this.toggleMute}><Icon id={muted ? 'volume-off' : 'volume-up'} fixedWidth /></button>
+
+              <div className='video-player__volume' onMouseDown={this.handleVolumeMouseDown} ref={this.setVolumeRef}>
+                &nbsp;
+                <div className='video-player__volume__current' style={{ width: `${volumeWidth}px` }} />
+
+                <span
+                  className={classNames('video-player__volume__handle')}
+                  tabIndex='0'
+                  style={{ left: `${volumeHandleLoc}px` }}
+                />
+              </div>
+
+              <span>
+                <span className='video-player__time-current'>{formatTime(currentTime)}</span>
+                <span className='video-player__time-sep'>/</span>
+                <span className='video-player__time-total'>{formatTime(this.state.duration || Math.floor(this.props.duration))}</span>
+              </span>
+            </div>
+
+            <div className='video-player__buttons right'>
+              <button type='button' aria-label={intl.formatMessage(messages.download)}>
+                <a className='video-player__download__icon' href={this.props.src} download>
+                  <Icon id={'download'} fixedWidth />
+                </a>
+              </button>
+            </div>
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+}