Scrubbing works

main/index.css

@@ -276,18 +276,28 @@ body.drag::before {
  opacity: 1;
 }
 
+/* invisible click target for scrubbing */
+.player-controls .scrub-bar {
+  position: absolute;
+  width: 100%;
+  height: 23px; /* 3px .loading-bar plus 10px above and below */
+  top: -10px;
+  left: 0;
+  cursor: pointer;
+}
+
 .player-controls .loading-bar {
   position: relative;
   width: 100%;
   height: 3px;
-  background-color: rgba(0, 0, 0, 0.5);
+  background-color: rgba(0, 0, 0, 0.3);
 }
 
 .player-controls .loading-bar-part {
   position: absolute;
   top: 0;
   height: 100%;
-  background-color: rgba(100, 0, 0, 0.8);
+  background-color: #dd0000;
 }
 
 .player-controls .playback-cursor {
@@ -304,4 +314,5 @@ body.drag::before {
   width: 20px;
   height: 20px;
   margin: 5px auto;
+  cursor: pointer;
 }

main/index.js

@@ -41,6 +41,7 @@ var state = global.state = {
       chromecast: null /* chromecast client. finds and manages Chromecasts */
     },
     client: null, /* the WebTorrent client */
+    torrentPlaying: null, /* the torrent we're streaming. see client.torrents */
     // history: [], /* track how we got to the current view. enables Back button */
     // historyIndex: 0,
     isFocused: true,
@@ -48,7 +49,9 @@ var state = global.state = {
     title: 'WebTorrent' /* current window title */
   },
   video: {
-    isPaused: false
+    isPaused: false,
+    currentTime: 0, /* seconds */
+    duration: 1 /* seconds */
   }
 }
 
@@ -156,6 +159,10 @@ function dispatch (action, ...args) {
     state.video.isPaused = !state.video.isPaused
     update()
   }
+  if (action === 'playbackJump') {
+    state.video.jumpToTime = args[0] /* seconds */
+    update()
+  }
 }
 
 electron.ipcRenderer.on('addTorrent', function (e, torrentId) {
@@ -224,9 +231,10 @@ function torrentReady (torrent) {
 
 function startServer (torrent, cb) {
   // use largest file
-  var index = torrent.files.indexOf(torrent.files.reduce(function (a, b) {
+  state.view.torrentPlaying = torrent.files.reduce(function (a, b) {
     return a.length > b.length ? a : b
-  }))
+  })
+  var index = torrent.files.indexOf(state.view.torrentPlaying)
 
   var server = torrent.createServer()
   server.listen(0, function () {
@@ -297,8 +305,8 @@ function setDimensions (dimensions) {
   var x = Math.floor((workAreaSize.width - width) / 2)
   var y = Math.floor((workAreaSize.height - height) / 2)
 
-  electron.ipcRenderer.send('setAspectRatio', aspectRatio, { width: 0, height: HEADER_HEIGHT })
-  electron.ipcRenderer.send('setBounds', { x, y, width, height })
+  electron.ipcRenderer.send('setAspectRatio', aspectRatio, {width: 0, height: HEADER_HEIGHT})
+  electron.ipcRenderer.send('setBounds', {x, y, width, height})
 }
 
 function restoreBounds () {

main/views/player.js

@@ -1,20 +1,28 @@
 module.exports = Player
 
 var h = require('virtual-dom/h')
+var electron = require('electron')
 
 function Player (state, dispatch) {
   // Unfortunately, play/pause can't be done just by modifying HTML.
   // Instead, grab the DOM node and play/pause it if necessary
   var videoElement = document.querySelector('video')
-  if (videoElement !== null &&
-      videoElement.paused !== state.video.isPaused) {
-    if (state.video.isPaused) {
+  if (videoElement !== null) {
+    if (state.video.isPaused && !videoElement.paused) {
       videoElement.pause()
-    } else {
+    } else if (!state.video.isPaused && videoElement.paused) {
       videoElement.play()
     }
+    // When the user clicks or drags on the progress bar, jump to that position
+    if (state.video.jumpToTime) {
+      videoElement.currentTime = state.video.jumpToTime
+      state.video.jumpToTime = null
+    }
+    state.video.currentTime = videoElement.currentTime
+    state.video.duration = videoElement.duration
   }
 
+  // Show the video as large as will fit in the window, play immediately
   return h('.player', [
     h('video', {
       src: state.server.localURL,
@@ -39,34 +47,64 @@ function Player (state, dispatch) {
 // Renders all video controls: play/pause, scrub, loading bar
 // TODO: cast buttons
 function renderPlayerControls (state, dispatch) {
+  var positionPercent = 100 * state.video.currentTime / state.video.duration
   return h('.player-controls', [
     h('.bottom-bar', [
-      h('.loading-bar', {
-        onclick: () => dispatch('playbackJump')
-      }, renderLoadingBar(state)),
+      h('.loading-bar', renderLoadingBar(state)),
+      h('.scrub-bar', {
+        draggable: true,
+        onclick: handleScrub,
+        ondrag: handleScrub
+      }),
       h('.playback-cursor', {
-        style: {left: '125px'}
+        style: {
+          left: 'calc(' + positionPercent + '% - 4px)'
+        }
       }),
       h('i.icon.play-pause', {
         onclick: () => dispatch('playPause')
       }, state.video.isPaused ? 'play_arrow' : 'pause')
     ])
   ])
+
+  // Handles a click or drag to scrub (jump to another position in the video)
+  function handleScrub (e) {
+    var windowWidth = electron.remote.getCurrentWindow().getBounds().width
+    var fraction = e.clientX / windowWidth
+    var position = fraction * state.video.duration /* seconds */
+    dispatch('playbackJump', position)
+  }
 }
 
 // Renders the loading bar. Shows which parts of the torrent are loaded, which
 // can be "spongey" / non-contiguous
 function renderLoadingBar (state) {
-  // TODO: get real data from webtorrent
-  return [
-    h('.loading-bar-part', {
-      style: {left: '10px', width: '50px'}
-    }),
-    h('.loading-bar-part', {
-      style: {left: '90px', width: '40px'}
-    }),
-    h('.loading-bar-part', {
-      style: {left: '135px', width: '5px'}
+  var torrent = state.view.torrentPlaying._torrent
+  if (torrent === null) {
+    return []
+  }
+
+  // Find all contiguous parts of the torrent which are loaded
+  var parts = []
+  var lastPartPresent = false
+  var numParts = torrent.pieces.length
+  for (var i = 0; i < numParts; i++) {
+    var partPresent = torrent.bitfield.get(i)
+    if (partPresent && !lastPartPresent) {
+      parts.push({start: i, count: 1})
+    } else if (partPresent) {
+      parts[parts.length - 1].count++
+    }
+    lastPartPresent = partPresent
+  }
+
+  // Output an list of rectangles to show loading progress
+  return parts.map(function (part) {
+    return h('.loading-bar-part', {
+      style: {
+        left: (100 * part.start / numParts) + '%',
+        width: (100 * part.count / numParts) + '%'
+      }
     })
-  ]
+  })
 }