shaka-player/controls.js

/**
 * Copyright 2015 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * @fileoverview Implements the video controls overlay.
 */


/** @class */
var playerControls = function() {};


/**
 * Initializes the player controls.
 * @param {!HTMLVideoElement} video
 */
playerControls.init = function(video) {
  var videoContainer = document.getElementById('videoContainer');
  var playButton = document.getElementById('playButton');
  var pauseButton = document.getElementById('pauseButton');
  var seekBar = document.getElementById('seekBar');
  var muteButton = document.getElementById('muteButton');
  var unmuteButton = document.getElementById('unmuteButton');
  var volumeBar = document.getElementById('volumeBar');
  var currentTime = document.getElementById('currentTime');
  var fullscreenButton = document.getElementById('fullscreenButton');

  var seeking = false;

  // play
  playButton.addEventListener('click', function() {
    if (!video.src) return;
    video.play();
  });
  video.addEventListener('play', function() {
    playButton.style.display = 'none';
    pauseButton.style.display = 'block';
  });

  // pause
  pauseButton.addEventListener('click', function() {
    video.pause();
  });
  video.addEventListener('pause', function() {
    if (!seeking) {
      pauseButton.style.display = 'none';
      playButton.style.display = 'block';
    }
  });

  // seek
  seekBar.addEventListener('mousedown', function() {
    seeking = true;
  });
  seekBar.addEventListener('input', function() {
    if (video.duration) {
      video.currentTime = seekBar.value * video.duration;
    }
  });
  seekBar.addEventListener('mouseup', function() {
    seeking = false;
  });
  // initialize seek bar with 0
  seekBar.value = 0;

  // mute/unmute
  muteButton.addEventListener('click', function() {
    video.muted = true;
  });
  unmuteButton.addEventListener('click', function() {
    video.muted = false;
  });

  // volume
  volumeBar.oninput = function() {
    video.volume = volumeBar.value;
    video.muted = false;
  };

  // volume & mute updates
  video.addEventListener('volumechange', function() {
    if (video.muted) {
      muteButton.style.display = 'none';
      unmuteButton.style.display = 'block';
    } else {
      unmuteButton.style.display = 'none';
      muteButton.style.display = 'block';
    }

    volumeBar.value = video.muted ? 0 : video.volume;
    var gradient = ['to right'];
    gradient.push('#ccc ' + (volumeBar.value * 100) + '%');
    gradient.push('#000 ' + (volumeBar.value * 100) + '%');
    gradient.push('#000 100%');
    volumeBar.style.background =
        'linear-gradient(' + gradient.join(',') + ')';
  });
  // initialize volume display with a fake event
  video.dispatchEvent(new Event('volumechange'));

  // current time & seek bar updates
  video.addEventListener('timeupdate', function() {
    var m = Math.floor(video.currentTime / 60);
    var s = Math.floor(video.currentTime % 60);
    if (s < 10) s = '0' + s;
    currentTime.innerText = m + ':' + s;

    // The fallback to 0 eliminates NaN.
    seekBar.value = (video.currentTime / video.duration) || 0;

    var gradient = ['to right'];
    var buffered = video.buffered;
    if (buffered.length == 0) {
      gradient.push('#000 0%');
    } else {
      var bufferStart = buffered.start(0) / video.duration;
      var bufferEnd = buffered.end(0) / video.duration;
      gradient.push('#000 ' + (bufferStart * 100) + '%');
      gradient.push('#ccc ' + (bufferStart * 100) + '%');
      gradient.push('#ccc ' + (seekBar.value * 100) + '%');
      gradient.push('#444 ' + (seekBar.value * 100) + '%');
      gradient.push('#444 ' + (bufferEnd * 100) + '%');
      gradient.push('#000 ' + (bufferEnd * 100) + '%');
    }
    seekBar.style.background = 'linear-gradient(' + gradient.join(',') + ')';
  });

  // fullscreen
  fullscreenButton.onclick = function() {
    if (document.fullscreenElement) {
      document.exitFullscreen();
    } else {
      videoContainer.requestFullscreen();
    }
  };

  // fullscreen updates
  var normalSize = {};
  document.addEventListener('fullscreenchange', function() {
    if (document.fullscreenElement) {
      // remember previous size
      normalSize.w = videoContainer.style.width;
      normalSize.h = videoContainer.style.height;
      // expand the container
      videoContainer.style.width = '100%';
      videoContainer.style.height = '100%';
    } else {
      // restore the previous size
      videoContainer.style.width = normalSize.w;
      videoContainer.style.height = normalSize.h;
    }
  });
};


/**
 * Called by the application to set the buffering state.
 * @param {boolean} bufferingState
 */
playerControls.onBuffering = function(bufferingState) {
  var bufferingSpinner = document.getElementById('bufferingSpinner');
  bufferingSpinner.style.display = bufferingState ? 'flex' : 'none';
};