[Files.app] Split the JavaScript files into subdirectories: common, background, and foreground

chrome/browser/resources/file_manager/js/media/media_controls.js

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-'use strict';
-
-/**
- * @fileoverview MediaControls class implements media playback controls
- * that exist outside of the audio/video HTML element.
- */
-
-/**
- * @param {HTMLElement} containerElement The container for the controls.
- * @param {function} onMediaError Function to display an error message.
- * @constructor
- */
-function MediaControls(containerElement, onMediaError) {
-  this.container_ = containerElement;
-  this.document_ = this.container_.ownerDocument;
-  this.media_ = null;
-
-  this.onMediaPlayBound_ = this.onMediaPlay_.bind(this, true);
-  this.onMediaPauseBound_ = this.onMediaPlay_.bind(this, false);
-  this.onMediaDurationBound_ = this.onMediaDuration_.bind(this);
-  this.onMediaProgressBound_ = this.onMediaProgress_.bind(this);
-  this.onMediaError_ = onMediaError || function() {};
-}
-
-/**
- * Button's state types. Values are used as CSS class names.
- * @enum {string}
- */
-MediaControls.ButtonStateType = {
-  DEFAULT: 'default',
-  PLAYING: 'playing',
-  ENDED: 'ended'
-};
-
-/**
- * @return {HTMLAudioElement|HTMLVideoElement} The media element.
- */
-MediaControls.prototype.getMedia = function() { return this.media_ };
-
-/**
- * Format the time in hh:mm:ss format (omitting redundant leading zeros).
- *
- * @param {number} timeInSec Time in seconds.
- * @return {string} Formatted time string.
- * @private
- */
-MediaControls.formatTime_ = function(timeInSec) {
-  var seconds = Math.floor(timeInSec % 60);
-  var minutes = Math.floor((timeInSec / 60) % 60);
-  var hours = Math.floor(timeInSec / 60 / 60);
-  var result = '';
-  if (hours) result += hours + ':';
-  if (hours && (minutes < 10)) result += '0';
-  result += minutes + ':';
-  if (seconds < 10) result += '0';
-  result += seconds;
-  return result;
-};
-
-/**
- * Create a custom control.
- *
- * @param {string} className Class name.
- * @param {HTMLElement=} opt_parent Parent element or container if undefined.
- * @return {HTMLElement} The new control element.
- */
-MediaControls.prototype.createControl = function(className, opt_parent) {
-  var parent = opt_parent || this.container_;
-  var control = this.document_.createElement('div');
-  control.className = className;
-  parent.appendChild(control);
-  return control;
-};
-
-/**
- * Create a custom button.
- *
- * @param {string} className Class name.
- * @param {function(Event)} handler Click handler.
- * @param {HTMLElement=} opt_parent Parent element or container if undefined.
- * @param {number=} opt_numStates Number of states, default: 1.
- * @return {HTMLElement} The new button element.
- */
-MediaControls.prototype.createButton = function(
-    className, handler, opt_parent, opt_numStates) {
-  opt_numStates = opt_numStates || 1;
-
-  var button = this.createControl(className, opt_parent);
-  button.classList.add('media-button');
-  button.addEventListener('click', handler);
-
-  var stateTypes = Object.keys(MediaControls.ButtonStateType);
-  for (var state = 0; state != opt_numStates; state++) {
-    var stateClass = MediaControls.ButtonStateType[stateTypes[state]];
-    this.createControl('normal ' + stateClass, button);
-    this.createControl('hover ' + stateClass, button);
-    this.createControl('active ' + stateClass, button);
-  }
-  this.createControl('disabled', button);
-
-  button.setAttribute('state', MediaControls.ButtonStateType.DEFAULT);
-  button.addEventListener('click', handler);
-  return button;
-};
-
-/**
- * Enable/disable controls matching a given selector.
- *
- * @param {string} selector CSS selector.
- * @param {boolean} on True if enable, false if disable.
- * @private
- */
-MediaControls.prototype.enableControls_ = function(selector, on) {
-  var controls = this.container_.querySelectorAll(selector);
-  for (var i = 0; i != controls.length; i++) {
-    var classList = controls[i].classList;
-    if (on)
-      classList.remove('disabled');
-    else
-      classList.add('disabled');
-  }
-};
-
-/*
- * Playback control.
- */
-
-/**
- * Play the media.
- */
-MediaControls.prototype.play = function() {
-  this.media_.play();
-};
-
-/**
- * Pause the media.
- */
-MediaControls.prototype.pause = function() {
-  this.media_.pause();
-};
-
-/**
- * @return {boolean} True if the media is currently playing.
- */
-MediaControls.prototype.isPlaying = function() {
-  return !this.media_.paused && !this.media_.ended;
-};
-
-/**
- * Toggle play/pause.
- */
-MediaControls.prototype.togglePlayState = function() {
-  if (this.isPlaying())
-    this.pause();
-  else
-    this.play();
-};
-
-/**
- * Toggle play/pause state on a mouse click on the play/pause button. Can be
- * called externally. TODO(mtomasz): Remove it. http://www.crbug.com/254318.
- *
- * @param {Event=} opt_event Mouse click event.
- */
-MediaControls.prototype.onPlayButtonClicked = function(opt_event) {
-  this.togglePlayState();
-};
-
-/**
- * @param {HTMLElement=} opt_parent Parent container.
- */
-MediaControls.prototype.initPlayButton = function(opt_parent) {
-  this.playButton_ = this.createButton('play media-control',
-      this.onPlayButtonClicked.bind(this), opt_parent, 3 /* States. */);
-};
-
-/*
- * Time controls
- */
-
-/**
- * The default range of 100 is too coarse for the media progress slider.
- */
-MediaControls.PROGRESS_RANGE = 5000;
-
-/**
- * @param {boolean=} opt_seekMark True if the progress slider should have
- *     a seek mark.
- * @param {HTMLElement=} opt_parent Parent container.
- */
-MediaControls.prototype.initTimeControls = function(opt_seekMark, opt_parent) {
-  var timeControls = this.createControl('time-controls', opt_parent);
-
-  var sliderConstructor =
-      opt_seekMark ? MediaControls.PreciseSlider : MediaControls.Slider;
-
-  this.progressSlider_ = new sliderConstructor(
-      this.createControl('progress media-control', timeControls),
-      0, /* value */
-      MediaControls.PROGRESS_RANGE,
-      this.onProgressChange_.bind(this),
-      this.onProgressDrag_.bind(this));
-
-  var timeBox = this.createControl('time media-control', timeControls);
-
-  this.duration_ = this.createControl('duration', timeBox);
-  // Set the initial width to the minimum to reduce the flicker.
-  this.duration_.textContent = MediaControls.formatTime_(0);
-
-  this.currentTime_ = this.createControl('current', timeBox);
-};
-
-/**
- * @param {number} current Current time is seconds.
- * @param {number} duration Duration in seconds.
- * @private
- */
-MediaControls.prototype.displayProgress_ = function(current, duration) {
-  var ratio = current / duration;
-  this.progressSlider_.setValue(ratio);
-  this.currentTime_.textContent = MediaControls.formatTime_(current);
-};
-
-/**
- * @param {number} value Progress [0..1].
- * @private
- */
-MediaControls.prototype.onProgressChange_ = function(value) {
-  if (!this.media_.seekable || !this.media_.duration) {
-    console.error('Inconsistent media state');
-    return;
-  }
-
-  var current = this.media_.duration * value;
-  this.media_.currentTime = current;
-  this.currentTime_.textContent = MediaControls.formatTime_(current);
-};
-
-/**
- * @param {boolean} on True if dragging.
- * @private
- */
-MediaControls.prototype.onProgressDrag_ = function(on) {
-  if (on) {
-    this.resumeAfterDrag_ = this.isPlaying();
-    this.media_.pause();
-  } else {
-    if (this.resumeAfterDrag_) {
-      if (this.media_.ended)
-        this.onMediaPlay_(false);
-      else
-        this.media_.play();
-    }
-    this.updatePlayButtonState_(this.isPlaying());
-  }
-};
-
-/*
- * Volume controls
- */
-
-/**
- * @param {HTMLElement=} opt_parent Parent element for the controls.
- */
-MediaControls.prototype.initVolumeControls = function(opt_parent) {
-  var volumeControls = this.createControl('volume-controls', opt_parent);
-
-  this.soundButton_ = this.createButton('sound media-control',
-      this.onSoundButtonClick_.bind(this), volumeControls);
-  this.soundButton_.setAttribute('level', 3);  // max level.
-
-  this.volume_ = new MediaControls.AnimatedSlider(
-      this.createControl('volume media-control', volumeControls),
-      1, /* value */
-      100 /* range */,
-      this.onVolumeChange_.bind(this),
-      this.onVolumeDrag_.bind(this));
-};
-
-/**
- * Click handler for the sound level button.
- * @private
- */
-MediaControls.prototype.onSoundButtonClick_ = function() {
-  if (this.media_.volume == 0) {
-    this.volume_.setValue(this.savedVolume_ || 1);
-  } else {
-    this.savedVolume_ = this.media_.volume;
-    this.volume_.setValue(0);
-  }
-  this.onVolumeChange_(this.volume_.getValue());
-};
-
-/**
- * @param {number} value Volume [0..1].
- * @return {number} The rough level [0..3] used to pick an icon.
- * @private
- */
-MediaControls.getVolumeLevel_ = function(value) {
-  if (value == 0) return 0;
-  if (value <= 1 / 3) return 1;
-  if (value <= 2 / 3) return 2;
-  return 3;
-};
-
-/**
- * @param {number} value Volume [0..1].
- * @private
- */
-MediaControls.prototype.onVolumeChange_ = function(value) {
-  this.media_.volume = value;
-  this.soundButton_.setAttribute('level', MediaControls.getVolumeLevel_(value));
-};
-
-/**
- * @param {boolean} on True if dragging is in progress.
- * @private
- */
-MediaControls.prototype.onVolumeDrag_ = function(on) {
-  if (on && (this.media_.volume != 0)) {
-    this.savedVolume_ = this.media_.volume;
-  }
-};
-
-/*
- * Media event handlers.
- */
-
-/**
- * Attach a media element.
- *
- * @param {HTMLMediaElement} mediaElement The media element to control.
- */
-MediaControls.prototype.attachMedia = function(mediaElement) {
-  this.media_ = mediaElement;
-
-  this.media_.addEventListener('play', this.onMediaPlayBound_);
-  this.media_.addEventListener('pause', this.onMediaPauseBound_);
-  this.media_.addEventListener('durationchange', this.onMediaDurationBound_);
-  this.media_.addEventListener('timeupdate', this.onMediaProgressBound_);
-  this.media_.addEventListener('error', this.onMediaError_);
-
-  // Reflect the media state in the UI.
-  this.onMediaDuration_();
-  this.onMediaPlay_(this.isPlaying());
-  this.onMediaProgress_();
-  if (this.volume_) {
-    /* Copy the user selected volume to the new media element. */
-    this.media_.volume = this.volume_.getValue();
-  }
-};
-
-/**
- * Detach media event handlers.
- */
-MediaControls.prototype.detachMedia = function() {
-  if (!this.media_)
-    return;
-
-  this.media_.removeEventListener('play', this.onMediaPlayBound_);
-  this.media_.removeEventListener('pause', this.onMediaPauseBound_);
-  this.media_.removeEventListener('durationchange', this.onMediaDurationBound_);
-  this.media_.removeEventListener('timeupdate', this.onMediaProgressBound_);
-  this.media_.removeEventListener('error', this.onMediaError_);
-
-  this.media_ = null;
-};
-
-/**
- * Force-empty the media pipeline. This is a workaround for crbug.com/149957.
- * The document is not going to be GC-ed until the last Files app window closes,
- * but we want the media pipeline to deinitialize ASAP to minimize leakage.
- */
-MediaControls.prototype.cleanup = function() {
-  this.media_.src = '';
-  this.media_.load();
-  this.detachMedia();
-};
-
-/**
- * 'play' and 'pause' event handler.
- * @param {boolean} playing True if playing.
- * @private
- */
-MediaControls.prototype.onMediaPlay_ = function(playing) {
-  if (this.progressSlider_.isDragging())
-    return;
-
-  this.updatePlayButtonState_(playing);
-  this.onPlayStateChanged();
-};
-
-/**
- * 'durationchange' event handler.
- * @private
- */
-MediaControls.prototype.onMediaDuration_ = function() {
-  if (!this.media_.duration) {
-    this.enableControls_('.media-control', false);
-    return;
-  }
-
-  this.enableControls_('.media-control', true);
-
-  var sliderContainer = this.progressSlider_.getContainer();
-  if (this.media_.seekable)
-    sliderContainer.classList.remove('readonly');
-  else
-    sliderContainer.classList.add('readonly');
-
-  var valueToString = function(value) {
-    return MediaControls.formatTime_(this.media_.duration * value);
-  }.bind(this);
-
-  this.duration_.textContent = valueToString(1);
-
-  if (this.progressSlider_.setValueToStringFunction)
-    this.progressSlider_.setValueToStringFunction(valueToString);
-
-  if (this.media_.seekable)
-    this.restorePlayState();
-};
-
-/**
- * 'timeupdate' event handler.
- * @private
- */
-MediaControls.prototype.onMediaProgress_ = function() {
-  if (!this.media_.duration) {
-    this.displayProgress_(0, 1);
-    return;
-  }
-
-  var current = this.media_.currentTime;
-  var duration = this.media_.duration;
-
-  if (this.progressSlider_.isDragging())
-    return;
-
-  this.displayProgress_(current, duration);
-
-  if (current == duration) {
-    this.onMediaComplete();
-  }
-  this.onPlayStateChanged();
-};
-
-/**
- * Called when the media playback is complete.
- */
-MediaControls.prototype.onMediaComplete = function() {};
-
-/**
- * Called when play/pause state is changed or on playback progress.
- * This is the right moment to save the play state.
- */
-MediaControls.prototype.onPlayStateChanged = function() {};
-
-/**
- * Updates the play button state.
- * @param {boolean} playing If the video is playing.
- * @private
- */
-MediaControls.prototype.updatePlayButtonState_ = function(playing) {
-  if (playing) {
-    this.playButton_.setAttribute('state',
-                                  MediaControls.ButtonStateType.PLAYING);
-  } else if (!this.media_.ended) {
-    this.playButton_.setAttribute('state',
-                                  MediaControls.ButtonStateType.DEFAULT);
-  } else {
-    this.playButton_.setAttribute('state',
-                                  MediaControls.ButtonStateType.ENDED);
-  }
-};
-
-/**
- * Restore play state. Base implementation is empty.
- */
-MediaControls.prototype.restorePlayState = function() {};
-
-/**
- * Encode current state into the page URL or the app state.
- */
-MediaControls.prototype.encodeState = function() {
-  if (!this.media_.duration)
-    return;
-
-  if (window.appState) {
-    window.appState.time = this.media_.currentTime;
-    util.saveAppState();
-    return;
-  }
-
-  var playState = JSON.stringify({
-      play: this.isPlaying(),
-      time: this.media_.currentTime
-    });
-
-  var newLocation = document.location.origin + document.location.pathname +
-      document.location.search + '#' + playState;
-
-  document.location.href = newLocation;
-};
-
-/**
- * Decode current state from the page URL or the app state.
- * @return {boolean} True if decode succeeded.
- */
-MediaControls.prototype.decodeState = function() {
-  if (window.appState) {
-    if (!('time' in window.appState))
-      return false;
-    // There is no page reload for apps v2, only app restart.
-    // Always restart in paused state.
-    this.media_.currentTime = appState.time;
-    this.pause();
-    return true;
-  }
-
-  var hash = document.location.hash.substring(1);
-  if (hash) {
-    try {
-      var playState = JSON.parse(hash);
-      if (!('time' in playState))
-        return false;
-
-      this.media_.currentTime = playState.time;
-
-      if (playState.play)
-        this.play();
-      else
-        this.pause();
-
-      return true;
-    } catch (e) {
-      console.warn('Cannot decode play state');
-    }
-  }
-  return false;
-};
-
-/**
- * Remove current state from the page URL or the app state.
- */
-MediaControls.prototype.clearState = function() {
-  if (window.appState) {
-    if ('time' in window.appState)
-      delete window.appState.time;
-    util.saveAppState();
-    return;
-  }
-
-  var newLocation = document.location.origin + document.location.pathname +
-      document.location.search + '#';
-
-  document.location.href = newLocation;
-};
-
-/**
- * Create a customized slider control.
- *
- * @param {HTMLElement} container The containing div element.
- * @param {number} value Initial value [0..1].
- * @param {number} range Number of distinct slider positions to be supported.
- * @param {function(number)} onChange Value change handler.
- * @param {function(boolean)} onDrag Drag begin/end handler.
- * @constructor
- */
-
-MediaControls.Slider = function(container, value, range, onChange, onDrag) {
-  this.container_ = container;
-  this.onChange_ = onChange;
-  this.onDrag_ = onDrag;
-
-  var document = this.container_.ownerDocument;
-
-  this.container_.classList.add('custom-slider');
-
-  this.input_ = document.createElement('input');
-  this.input_.type = 'range';
-  this.input_.min = 0;
-  this.input_.max = range;
-  this.input_.value = value * range;
-  this.container_.appendChild(this.input_);
-
-  this.input_.addEventListener(
-      'change', this.onInputChange_.bind(this));
-  this.input_.addEventListener(
-      'mousedown', this.onInputDrag_.bind(this, true));
-  this.input_.addEventListener(
-      'mouseup', this.onInputDrag_.bind(this, false));
-
-  this.bar_ = document.createElement('div');
-  this.bar_.className = 'bar';
-  this.container_.appendChild(this.bar_);
-
-  this.filled_ = document.createElement('div');
-  this.filled_.className = 'filled';
-  this.bar_.appendChild(this.filled_);
-
-  var leftCap = document.createElement('div');
-  leftCap.className = 'cap left';
-  this.bar_.appendChild(leftCap);
-
-  var rightCap = document.createElement('div');
-  rightCap.className = 'cap right';
-  this.bar_.appendChild(rightCap);
-
-  this.value_ = value;
-  this.setFilled_(value);
-};
-
-/**
- * @return {HTMLElement} The container element.
- */
-MediaControls.Slider.prototype.getContainer = function() {
-  return this.container_;
-};
-
-/**
- * @return {HTMLElement} The standard input element.
- * @private
- */
-MediaControls.Slider.prototype.getInput_ = function() {
-  return this.input_;
-};
-
-/**
- * @return {HTMLElement} The slider bar element.
- */
-MediaControls.Slider.prototype.getBar = function() {
-  return this.bar_;
-};
-
-/**
- * @return {number} [0..1] The current value.
- */
-MediaControls.Slider.prototype.getValue = function() {
-  return this.value_;
-};
-
-/**
- * @param {number} value [0..1].
- */
-MediaControls.Slider.prototype.setValue = function(value) {
-  this.value_ = value;
-  this.setValueToUI_(value);
-};
-
-/**
- * Fill the given proportion the slider bar (from the left).
- *
- * @param {number} proportion [0..1].
- * @private
- */
-MediaControls.Slider.prototype.setFilled_ = function(proportion) {
-  this.filled_.style.width = proportion * 100 + '%';
-};
-
-/**
- * Get the value from the input element.
- *
- * @return {number} Value [0..1].
- * @private
- */
-MediaControls.Slider.prototype.getValueFromUI_ = function() {
-  return this.input_.value / this.input_.max;
-};
-
-/**
- * Update the UI with the current value.
- *
- * @param {number} value [0..1].
- * @private
- */
-MediaControls.Slider.prototype.setValueToUI_ = function(value) {
-  this.input_.value = value * this.input_.max;
-  this.setFilled_(value);
-};
-
-/**
- * Compute the proportion in which the given position divides the slider bar.
- *
- * @param {number} position in pixels.
- * @return {number} [0..1] proportion.
- */
-MediaControls.Slider.prototype.getProportion = function(position) {
-  var rect = this.bar_.getBoundingClientRect();
-  return Math.max(0, Math.min(1, (position - rect.left) / rect.width));
-};
-
-/**
- * 'change' event handler.
- * @private
- */
-MediaControls.Slider.prototype.onInputChange_ = function() {
-  this.value_ = this.getValueFromUI_();
-  this.setFilled_(this.value_);
-  this.onChange_(this.value_);
-};
-
-/**
- * @return {boolean} True if dragging is in progress.
- */
-MediaControls.Slider.prototype.isDragging = function() {
-  return this.isDragging_;
-};
-
-/**
- * Mousedown/mouseup handler.
- * @param {boolean} on True if the mouse is down.
- * @private
- */
-MediaControls.Slider.prototype.onInputDrag_ = function(on) {
-  this.isDragging_ = on;
-  this.onDrag_(on);
-};
-
-/**
- * Create a customized slider with animated thumb movement.
- *
- * @param {HTMLElement} container The containing div element.
- * @param {number} value Initial value [0..1].
- * @param {number} range Number of distinct slider positions to be supported.
- * @param {function(number)} onChange Value change handler.
- * @param {function(boolean)} onDrag Drag begin/end handler.
- * @param {function(number):string} formatFunction Value formatting function.
- * @constructor
- */
-MediaControls.AnimatedSlider = function(
-    container, value, range, onChange, onDrag, formatFunction) {
-  MediaControls.Slider.apply(this, arguments);
-};
-
-MediaControls.AnimatedSlider.prototype = {
-  __proto__: MediaControls.Slider.prototype
-};
-
-/**
- * Number of animation steps.
- */
-MediaControls.AnimatedSlider.STEPS = 10;
-
-/**
- * Animation duration.
- */
-MediaControls.AnimatedSlider.DURATION = 100;
-
-/**
- * @param {number} value [0..1].
- * @private
- */
-MediaControls.AnimatedSlider.prototype.setValueToUI_ = function(value) {
-  if (this.animationInterval_) {
-    clearInterval(this.animationInterval_);
-  }
-  var oldValue = this.getValueFromUI_();
-  var step = 0;
-  this.animationInterval_ = setInterval(function() {
-      step++;
-      var currentValue = oldValue +
-          (value - oldValue) * (step / MediaControls.AnimatedSlider.STEPS);
-      MediaControls.Slider.prototype.setValueToUI_.call(this, currentValue);
-      if (step == MediaControls.AnimatedSlider.STEPS) {
-        clearInterval(this.animationInterval_);
-      }
-    }.bind(this),
-    MediaControls.AnimatedSlider.DURATION / MediaControls.AnimatedSlider.STEPS);
-};
-
-/**
- * Create a customized slider with a precise time feedback.
- *
- * The time value is shown above the slider bar at the mouse position.
- *
- * @param {HTMLElement} container The containing div element.
- * @param {number} value Initial value [0..1].
- * @param {number} range Number of distinct slider positions to be supported.
- * @param {function(number)} onChange Value change handler.
- * @param {function(boolean)} onDrag Drag begin/end handler.
- * @param {function(number):string} formatFunction Value formatting function.
- * @constructor
- */
-MediaControls.PreciseSlider = function(
-    container, value, range, onChange, onDrag, formatFunction) {
-  MediaControls.Slider.apply(this, arguments);
-
-  var doc = this.container_.ownerDocument;
-
-  /**
-   * @type {function(number):string}
-   * @private
-   */
-  this.valueToString_ = null;
-
-  this.seekMark_ = doc.createElement('div');
-  this.seekMark_.className = 'seek-mark';
-  this.getBar().appendChild(this.seekMark_);
-
-  this.seekLabel_ = doc.createElement('div');
-  this.seekLabel_.className = 'seek-label';
-  this.seekMark_.appendChild(this.seekLabel_);
-
-  this.getContainer().addEventListener(
-      'mousemove', this.onMouseMove_.bind(this));
-  this.getContainer().addEventListener(
-      'mouseout', this.onMouseOut_.bind(this));
-};
-
-MediaControls.PreciseSlider.prototype = {
-  __proto__: MediaControls.Slider.prototype
-};
-
-/**
- * Show the seek mark after a delay.
- */
-MediaControls.PreciseSlider.SHOW_DELAY = 200;
-
-/**
- * Hide the seek mark for this long after changing the position with a click.
- */
-MediaControls.PreciseSlider.HIDE_AFTER_MOVE_DELAY = 2500;
-
-/**
- * Hide the seek mark for this long after changing the position with a drag.
- */
-MediaControls.PreciseSlider.HIDE_AFTER_DRAG_DELAY = 750;
-
-/**
- * Default hide timeout (no hiding).
- */
-MediaControls.PreciseSlider.NO_AUTO_HIDE = 0;
-
-/**
- * @param {function(number):string} func Value formatting function.
- */
-MediaControls.PreciseSlider.prototype.setValueToStringFunction =
-    function(func) {
-  this.valueToString_ = func;
-
-  /* It is not completely accurate to assume that the max value corresponds
-   to the longest string, but generous CSS padding will compensate for that. */
-  var labelWidth = this.valueToString_(1).length / 2 + 1;
-  this.seekLabel_.style.width = labelWidth + 'em';
-  this.seekLabel_.style.marginLeft = -labelWidth / 2 + 'em';
-};
-
-/**
- * Show the time above the slider.
- *
- * @param {number} ratio [0..1] The proportion of the duration.
- * @param {number} timeout Timeout in ms after which the label should be hidden.
- *     MediaControls.PreciseSlider.NO_AUTO_HIDE means show until the next call.
- * @private
- */
-MediaControls.PreciseSlider.prototype.showSeekMark_ =
-    function(ratio, timeout) {
-  // Do not update the seek mark for the first 500ms after the drag is finished.
-  if (this.latestMouseUpTime_ && (this.latestMouseUpTime_ + 500 > Date.now()))
-    return;
-
-  this.seekMark_.style.left = ratio * 100 + '%';
-
-  if (ratio < this.getValue()) {
-    this.seekMark_.classList.remove('inverted');
-  } else {
-    this.seekMark_.classList.add('inverted');
-  }
-  this.seekLabel_.textContent = this.valueToString_(ratio);
-
-  this.seekMark_.classList.add('visible');
-
-  if (this.seekMarkTimer_) {
-    clearTimeout(this.seekMarkTimer_);
-    this.seekMarkTimer_ = null;
-  }
-  if (timeout != MediaControls.PreciseSlider.NO_AUTO_HIDE) {
-    this.seekMarkTimer_ = setTimeout(this.hideSeekMark_.bind(this), timeout);
-  }
-};
-
-/**
- * @private
- */
-MediaControls.PreciseSlider.prototype.hideSeekMark_ = function() {
-  this.seekMarkTimer_ = null;
-  this.seekMark_.classList.remove('visible');
-};
-
-/**
- * 'mouseout' event handler.
- * @param {Event} e Event.
- * @private
- */
-MediaControls.PreciseSlider.prototype.onMouseMove_ = function(e) {
-  this.latestSeekRatio_ = this.getProportion(e.clientX);
-
-  var self = this;
-  function showMark() {
-    if (!self.isDragging()) {
-      self.showSeekMark_(self.latestSeekRatio_,
-          MediaControls.PreciseSlider.HIDE_AFTER_MOVE_DELAY);
-    }
-  }
-
-  if (this.seekMark_.classList.contains('visible')) {
-    showMark();
-  } else if (!this.seekMarkTimer_) {
-    this.seekMarkTimer_ =
-        setTimeout(showMark, MediaControls.PreciseSlider.SHOW_DELAY);
-  }
-};
-
-/**
- * 'mouseout' event handler.
- * @param {Event} e Event.
- * @private
- */
-MediaControls.PreciseSlider.prototype.onMouseOut_ = function(e) {
-  for (var element = e.relatedTarget; element; element = element.parentNode) {
-    if (element == this.getContainer())
-      return;
-  }
-  if (this.seekMarkTimer_) {
-    clearTimeout(this.seekMarkTimer_);
-    this.seekMarkTimer_ = null;
-  }
-  this.hideSeekMark_();
-};
-
-/**
- * 'change' event handler.
- * @private
- */
-MediaControls.PreciseSlider.prototype.onInputChange_ = function() {
-  MediaControls.Slider.prototype.onInputChange_.apply(this, arguments);
-  if (this.isDragging()) {
-    this.showSeekMark_(
-        this.getValue(), MediaControls.PreciseSlider.NO_AUTO_HIDE);
-  }
-};
-
-/**
- * Mousedown/mouseup handler.
- * @param {boolean} on True if the mouse is down.
- * @private
- */
-MediaControls.PreciseSlider.prototype.onInputDrag_ = function(on) {
-  MediaControls.Slider.prototype.onInputDrag_.apply(this, arguments);
-
-  if (on) {
-    // Dragging started, align the seek mark with the thumb position.
-    this.showSeekMark_(
-        this.getValue(), MediaControls.PreciseSlider.NO_AUTO_HIDE);
-  } else {
-    // Just finished dragging.
-    // Show the label for the last time with a shorter timeout.
-    this.showSeekMark_(
-        this.getValue(), MediaControls.PreciseSlider.HIDE_AFTER_DRAG_DELAY);
-    this.latestMouseUpTime_ = Date.now();
-  }
-};
-
-/**
- * Create video controls.
- *
- * @param {HTMLElement} containerElement The container for the controls.
- * @param {function} onMediaError Function to display an error message.
- * @param {function(string):string} stringFunction Function providing localized
- *     strings.
- * @param {function=} opt_fullScreenToggle Function to toggle fullscreen mode.
- * @param {HTMLElement=} opt_stateIconParent The parent for the icon that
- *     gives visual feedback when the playback state changes.
- * @constructor
- */
-function VideoControls(containerElement, onMediaError, stringFunction,
-   opt_fullScreenToggle, opt_stateIconParent) {
-  MediaControls.call(this, containerElement, onMediaError);
-  this.stringFunction_ = stringFunction;
-
-  this.container_.classList.add('video-controls');
-  this.initPlayButton();
-  this.initTimeControls(true /* show seek mark */);
-  this.initVolumeControls();
-
-  if (opt_fullScreenToggle) {
-    this.fullscreenButton_ =
-        this.createButton('fullscreen', opt_fullScreenToggle);
-  }
-
-  if (opt_stateIconParent) {
-    this.stateIcon_ = this.createControl(
-        'playback-state-icon', opt_stateIconParent);
-    this.textBanner_ = this.createControl('text-banner', opt_stateIconParent);
-  }
-
-  var videoControls = this;
-  chrome.mediaPlayerPrivate.onTogglePlayState.addListener(
-      function() { videoControls.togglePlayStateWithFeedback(); });
-}
-
-/**
- * No resume if we are within this margin from the start or the end.
- */
-VideoControls.RESUME_MARGIN = 0.03;
-
-/**
- * No resume for videos shorter than this.
- */
-VideoControls.RESUME_THRESHOLD = 5 * 60; // 5 min.
-
-/**
- * When resuming rewind back this much.
- */
-VideoControls.RESUME_REWIND = 5;  // seconds.
-
-VideoControls.prototype = { __proto__: MediaControls.prototype };
-
-/**
- * Shows icon feedback for the current state of the video player.
- * @private
- */
-VideoControls.prototype.showIconFeedback_ = function() {
-  this.stateIcon_.removeAttribute('state');
-  setTimeout(function() {
-    this.stateIcon_.setAttribute('state', this.isPlaying() ? 'play' : 'pause');
-  }.bind(this), 0);
-};
-
-/**
- * Shows a text banner.
- *
- * @param {string} identifier String identifier.
- * @private
- */
-VideoControls.prototype.showTextBanner_ = function(identifier) {
-  this.textBanner_.removeAttribute('visible');
-  this.textBanner_.textContent = this.stringFunction_(identifier);
-  setTimeout(function() {
-    this.textBanner_.setAttribute('visible', 'true');
-  }.bind(this), 0);
-};
-
-/**
- * Toggle play/pause state on a mouse click on the play/pause button. Can be
- * called externally.
- *
- * @param {Event} event Mouse click event.
- */
-VideoControls.prototype.onPlayButtonClicked = function(event) {
-  if (event.ctrlKey) {
-    this.toggleLoopedModeWithFeedback(true);
-    if (!this.isPlaying())
-      this.togglePlayState();
-  } else {
-    this.togglePlayState();
-  }
-};
-
-/**
- * Media completion handler.
- */
-VideoControls.prototype.onMediaComplete = function() {
-  this.onMediaPlay_(false);  // Just update the UI.
-  this.savePosition();  // This will effectively forget the position.
-};
-
-/**
- * Toggles the looped mode with feedback.
- * @param {boolean} on Whether enabled or not.
- */
-VideoControls.prototype.toggleLoopedModeWithFeedback = function(on) {
-  if (!this.getMedia().duration)
-    return;
-  this.toggleLoopedMode(on);
-  if (on) {
-    // TODO(mtomasz): Simplify, crbug.com/254318.
-    this.showTextBanner_('GALLERY_VIDEO_LOOPED_MODE');
-  }
-};
-
-/**
- * Toggles the looped mode.
- * @param {boolean} on Whether enabled or not.
- */
-VideoControls.prototype.toggleLoopedMode = function(on) {
-  this.getMedia().loop = on;
-};
-
-/**
- * Toggles play/pause state and flash an icon over the video.
- */
-VideoControls.prototype.togglePlayStateWithFeedback = function() {
-  if (!this.getMedia().duration)
-    return;
-
-  this.togglePlayState();
-  this.showIconFeedback_();
-};
-
-/**
- * Toggles play/pause state.
- */
-VideoControls.prototype.togglePlayState = function() {
-  if (this.isPlaying()) {
-    // User gave the Pause command. Save the state and reset the loop mode.
-    this.toggleLoopedMode(false);
-    this.savePosition();
-  }
-  MediaControls.prototype.togglePlayState.apply(this, arguments);
-};
-
-/**
- * Saves the playback position to the persistent storage.
- * @param {boolean=} opt_sync True if the position must be saved synchronously
- *     (required when closing app windows).
- */
-VideoControls.prototype.savePosition = function(opt_sync) {
-  if (!this.media_.duration ||
-      this.media_.duration < VideoControls.RESUME_THRESHOLD) {
-    return;
-  }
-
-  var ratio = this.media_.currentTime / this.media_.duration;
-  var position;
-  if (ratio < VideoControls.RESUME_MARGIN ||
-      ratio > (1 - VideoControls.RESUME_MARGIN)) {
-    // We are too close to the beginning or the end.
-    // Remove the resume position so that next time we start from the beginning.
-    position = null;
-  } else {
-    position = Math.floor(
-        Math.max(0, this.media_.currentTime - VideoControls.RESUME_REWIND));
-  }
-
-  if (opt_sync) {
-    // Packaged apps cannot save synchronously.
-    // Pass the data to the background page.
-    if (!window.saveOnExit)
-      window.saveOnExit = [];
-    window.saveOnExit.push({ key: this.media_.src, value: position });
-  } else {
-    util.AppCache.update(this.media_.src, position);
-  }
-};
-
-/**
- * Resumes the playback position saved in the persistent storage.
- */
-VideoControls.prototype.restorePlayState = function() {
-  if (this.media_.duration >= VideoControls.RESUME_THRESHOLD) {
-    util.AppCache.getValue(this.media_.src, function(position) {
-      if (position)
-        this.media_.currentTime = position;
-    }.bind(this));
-  }
-};
-
-/**
- * Updates style to best fit the size of the container.
- */
-VideoControls.prototype.updateStyle = function() {
-  // We assume that the video controls element fills the parent container.
-  // This is easier than adding margins to this.container_.clientWidth.
-  var width = this.container_.parentNode.clientWidth;
-
-  // Set the margin to 5px for width >= 400, 0px for width < 160,
-  // interpolate linearly in between.
-  this.container_.style.margin =
-      Math.ceil((Math.max(160, Math.min(width, 400)) - 160) / 48) + 'px';
-
-  var hideBelow = function(selector, limit) {
-    this.container_.querySelector(selector).style.display =
-        width < limit ? 'none' : '-webkit-box';
-  }.bind(this);
-
-  hideBelow('.time', 350);
-  hideBelow('.volume', 275);
-  hideBelow('.volume-controls', 210);
-  hideBelow('.fullscreen', 150);
-};
-
-/**
- * Creates audio controls.
- *
- * @param {HTMLElement} container Parent container.
- * @param {function(boolean)} advanceTrack Parameter: true=forward.
- * @param {function} onError Error handler.
- * @constructor
- */
-function AudioControls(container, advanceTrack, onError) {
-  MediaControls.call(this, container, onError);
-
-  this.container_.classList.add('audio-controls');
-
-  this.advanceTrack_ = advanceTrack;
-
-  this.initPlayButton();
-  this.initTimeControls(false /* no seek mark */);
-  /* No volume controls */
-  this.createButton('previous', this.onAdvanceClick_.bind(this, false));
-  this.createButton('next', this.onAdvanceClick_.bind(this, true));
-
-  var audioControls = this;
-  chrome.mediaPlayerPrivate.onNextTrack.addListener(
-      function() { audioControls.onAdvanceClick_(true); });
-  chrome.mediaPlayerPrivate.onPrevTrack.addListener(
-      function() { audioControls.onAdvanceClick_(false); });
-  chrome.mediaPlayerPrivate.onTogglePlayState.addListener(
-      function() { audioControls.togglePlayState(); });
-}
-
-AudioControls.prototype = { __proto__: MediaControls.prototype };
-
-/**
- * Media completion handler. Advances to the next track.
- */
-AudioControls.prototype.onMediaComplete = function() {
-  this.advanceTrack_(true);
-};
-
-/**
- * The track position after which "previous" button acts as "restart".
- */
-AudioControls.TRACK_RESTART_THRESHOLD = 5;  // seconds.
-
-/**
- * @param {boolean} forward True if advancing forward.
- * @private
- */
-AudioControls.prototype.onAdvanceClick_ = function(forward) {
-  if (!forward &&
-      (this.getMedia().currentTime > AudioControls.TRACK_RESTART_THRESHOLD)) {
-    // We are far enough from the beginning of the current track.
-    // Restart it instead of than skipping to the previous one.
-    this.getMedia().currentTime = 0;
-  } else {
-    this.advanceTrack_(forward);
-  }
-};