strategy-normal.js
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/*
* ADOBE CONFIDENTIAL
*
* Copyright 2015 Adobe Systems Incorporated
* All Rights Reserved.
*
* NOTICE: All information contained herein is, and remains
* the property of Adobe Systems Incorporated and its suppliers,
* if any. The intellectual and technical concepts contained
* herein are proprietary to Adobe Systems Incorporated and its
* suppliers and may be covered by U.S. and Foreign Patents,
* patents in process, and are protected by trade secret or copyright law.
* Dissemination of this information or reproduction of this material
* is strictly forbidden unless prior written permission is obtained
* from Adobe Systems Incorporated.
*/
(function($, player) {
'use strict';
/**
* A simple strategy that cycles through the items following their order in the DOM.
*
* @class
*
* @param {HTMLElement|jQuery} el The sequence element
*/
var NormalStrategy = function(el) {
this.$el = $(el);
this.el = this.$el.get(0);
this.$el.data('screens-strategy', this);
this.items().hide();
};
/**
* The sequence elements for this strategy.
*/
NormalStrategy.prototype.init = function() {};
NormalStrategy.prototype.items = function() {
return $(this.el.getElementsByClassName('cq-Sequence-item'));
};
/**
* Get the item which is shown when the sequence starts
*
* @return {jQuery} The starting item according to the strategy
*/
NormalStrategy.prototype.startItem = function() {
return this.items().first();
};
/**
* Check if a cycle is complete
*
* @param {jQuery} [$item] The current sequence element
*
* @returns {boolean} `true` if the cycle of the sequence is completed, `false` otherwise
*/
NormalStrategy.prototype.isCycleComplete = function($item) {
var last = this.items().last();
// cycle is complete if no item or if current $item is the last one
return this.items().length === 0 || ($item && (last[0] === $item[0]));
};
/**
* Get the next sequence element for this strategy.
*
* @param {jQuery} [$item] The current sequence element
*
* @return {jQuery} The next item according to the strategy
*/
NormalStrategy.prototype.next = function($item) {
var $items = this.items();
if (!$items.length) {
return null;
}
var index = $item ? $items.index($item) : -1;
var $nextItem = $items.eq((index + 1) % $items.length);
var nextItem = $nextItem.get(0);
var transitionType = 'normal';
var transitionDuration = 0;
var $transition = $nextItem.prev('.cq-Sequence-transition');
if ($item) { // Handle sequences that end with a transition
$transition = $transition.add($item.next('.cq-Sequence-transition'));
}
if ($transition && $transition.length) {
var transitionMeta = $transition.get(0).getElementsByClassName('transition')[0];
transitionType = transitionMeta ? transitionMeta.dataset.transition : null;
transitionDuration = transitionMeta ? parseInt(transitionMeta.dataset.transitionDuration, 10) : null;
}
if (nextItem.dataset.duration === '0') {
$nextItem = this.next();
}
else if (nextItem.dataset.pauseSequence === 'true') {
this.$el.trigger('pause-sequence');
}
return {
$item: $nextItem,
transitionType: transitionType,
transitionDuration: transitionDuration
};
};
/**
* Get the duration for the specified sequence element.
*
* @param {jQuery} [$item] The sequence element to get the duration for
*
* @return {Number} The duration for the item in ms
*/
NormalStrategy.prototype.duration = function($item) {
var item = $item.get(0);
var duration = null;
if (item) {
duration = parseInt(item.dataset.duration, 10);
if (!duration) {
var el = item.querySelector('[data-duration]');
duration = el ? parseInt(el.dataset.duration, 10) : null;
// Backward compatibility case where channel was created in 6.3 GA
// A duration of -1 means that the subsequence is responsible for determining the sequence length
// This was defaulted in the UI after 6.3 GA but channels with subsequences created in older versions
// may have issues. Therefore adding this default in the code as well
if ((!duration) && (item.classList.contains('cq-Screens-subsequence'))) {
var iFrame = item.getElementsByTagName('iframe')[0];
if (iFrame) {
iFrame.setAttribute('data-duration', '-1');
duration = -1;
}
}
}
}
duration = parseInt(duration, 10);
if (isNaN(duration) || duration === 0) {
// 0 or null case, use duration of the sequence
duration = parseInt(this.el.dataset.duration, 10) || 5000;
}
return duration;
};
/**
* Schedule the current item.
*
* @param {Function} callback Function to call when the next item should play
* @param {Number} duration The duration in ms
*/
NormalStrategy.prototype.scheduleCurrent = function(callback, duration) {
this.timeout = window.setTimeout(callback, duration);
};
/**
* Destroy the strategy.
*/
NormalStrategy.prototype.destroy = function() {
this.$el.removeData('screens-strategy');
this.$el = null;
this.el = null;
};
player.strategies.normal = NormalStrategy;
}(window.jQuery, window.ScreensPlayer));