Oinktube/node_modules/flickity/js/player.js

// player & autoPlay
( function( window, factory ) {
  // universal module definition
  if ( typeof module == 'object' && module.exports ) {
    // CommonJS
    module.exports = factory( require('./core') );
  } else {
    // browser global
    factory( window.Flickity );
  }

}( typeof window != 'undefined' ? window : this, function factory( Flickity ) {

// -------------------------- Player -------------------------- //

function Player( autoPlay, onTick ) {
  this.autoPlay = autoPlay;
  this.onTick = onTick;
  this.state = 'stopped';
  // visibility change event handler
  this.onVisibilityChange = this.visibilityChange.bind( this );
  this.onVisibilityPlay = this.visibilityPlay.bind( this );
}

// start play
Player.prototype.play = function() {
  if ( this.state === 'playing' ) return;

  // do not play if page is hidden, start playing when page is visible
  let isPageHidden = document.hidden;
  if ( isPageHidden ) {
    document.addEventListener( 'visibilitychange', this.onVisibilityPlay );
    return;
  }

  this.state = 'playing';
  // listen to visibility change
  document.addEventListener( 'visibilitychange', this.onVisibilityChange );
  // start ticking
  this.tick();
};

Player.prototype.tick = function() {
  // do not tick if not playing
  if ( this.state !== 'playing' ) return;

  // default to 3 seconds
  let time = typeof this.autoPlay == 'number' ? this.autoPlay : 3000;
  // HACK: reset ticks if stopped and started within interval
  this.clear();
  this.timeout = setTimeout( () => {
    this.onTick();
    this.tick();
  }, time );
};

Player.prototype.stop = function() {
  this.state = 'stopped';
  this.clear();
  // remove visibility change event
  document.removeEventListener( 'visibilitychange', this.onVisibilityChange );
};

Player.prototype.clear = function() {
  clearTimeout( this.timeout );
};

Player.prototype.pause = function() {
  if ( this.state === 'playing' ) {
    this.state = 'paused';
    this.clear();
  }
};

Player.prototype.unpause = function() {
  // re-start play if paused
  if ( this.state === 'paused' ) this.play();
};

// pause if page visibility is hidden, unpause if visible
Player.prototype.visibilityChange = function() {
  let isPageHidden = document.hidden;
  this[ isPageHidden ? 'pause' : 'unpause' ]();
};

Player.prototype.visibilityPlay = function() {
  this.play();
  document.removeEventListener( 'visibilitychange', this.onVisibilityPlay );
};

// -------------------------- Flickity -------------------------- //

Object.assign( Flickity.defaults, {
  pauseAutoPlayOnHover: true,
} );

Flickity.create.player = function() {
  this.player = new Player( this.options.autoPlay, () => {
    this.next( true );
  } );

  this.on( 'activate', this.activatePlayer );
  this.on( 'uiChange', this.stopPlayer );
  this.on( 'pointerDown', this.stopPlayer );
  this.on( 'deactivate', this.deactivatePlayer );
};

let proto = Flickity.prototype;

proto.activatePlayer = function() {
  if ( !this.options.autoPlay ) return;

  this.player.play();
  this.element.addEventListener( 'mouseenter', this );
};

// Player API, don't hate the ... thanks I know where the door is

proto.playPlayer = function() {
  this.player.play();
};

proto.stopPlayer = function() {
  this.player.stop();
};

proto.pausePlayer = function() {
  this.player.pause();
};

proto.unpausePlayer = function() {
  this.player.unpause();
};

proto.deactivatePlayer = function() {
  this.player.stop();
  this.element.removeEventListener( 'mouseenter', this );
};

// ----- mouseenter/leave ----- //

// pause auto-play on hover
proto.onmouseenter = function() {
  if ( !this.options.pauseAutoPlayOnHover ) return;

  this.player.pause();
  this.element.addEventListener( 'mouseleave', this );
};

// resume auto-play on hover off
proto.onmouseleave = function() {
  this.player.unpause();
  this.element.removeEventListener( 'mouseleave', this );
};

// -----  ----- //

Flickity.Player = Player;

return Flickity;

} ) );