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/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
define([
'jquery',
'jquery/ui'
], function ($) {
'use strict';
$.widget('mage.sticky', {
options: {
/**
* Element selector, who's height will be used to restrict the
* maximum offsetTop position of the stuck element.
* Default uses document body.
* @type {String}
*/
container: '',
/**
* Spacing in pixels above the stuck element
* @type {Number|Function} Number or Function that will return a Number
*/
spacingTop: 0,
/**
* Allows postponing sticking, until element will go out of the
* screen for the number of pixels.
* @type {Number|Function} Number or Function that will return a Number
*/
stickAfter: 0,
/**
* CSS class for active sticky state
* @type {String}
*/
stickyClass: '_sticky'
},
/**
* Retrieve option value
* @param {String} option
* @return {*}
* @private
*/
_getOptionValue: function (option) {
var value = this.options[option] || 0;
if (typeof value === 'function') {
value = this.options[option]();
}
return value;
},
/**
* Bind handlers to scroll event
* @private
*/
_create: function () {
$(window).on({
'scroll': $.proxy(this._stick, this),
'resize': $.proxy(this.reset, this)
});
this.element.on('dimensionsChanged', $.proxy(this.reset, this));
this.reset();
},
/**
* float Block on windowScroll
* @private
*/
_stick: function () {
var offset,
isStatic,
stuck,
stickAfter;
isStatic = this.element.css('position') === 'static';
if (!isStatic && this.element.is(':visible')) {
offset = $(document).scrollTop() -
this.parentOffset +
this._getOptionValue('spacingTop');
offset = Math.max(0, Math.min(offset, this.maxOffset));
stuck = this.element.hasClass(this.options.stickyClass);
stickAfter = this._getOptionValue('stickAfter');
if (offset && !stuck && offset < stickAfter) {
offset = 0;
}
this.element
.toggleClass(this.options.stickyClass, offset > 0)
.css('top', offset);
}
},
/**
* Defines maximum offset value of the element.
* @private
*/
_calculateDimens: function () {
var $parent = this.element.parent(),
topMargin = parseInt(this.element.css('margin-top'), 10),
parentHeight = $parent.height() - topMargin,
height = this.element.innerHeight(),
maxScroll = document.body.offsetHeight - window.innerHeight;
if (this.options.container.length > 0) {
maxScroll = $(this.options.container).height();
}
this.parentOffset = $parent.offset().top + topMargin;
this.maxOffset = maxScroll - this.parentOffset;
if (this.maxOffset + height >= parentHeight) {
this.maxOffset = parentHeight - height;
}
return this;
},
/**
* Facade method that palces sticky element where it should be.
*/
reset: function () {
this._calculateDimens()
._stick();
}
});
return $.mage.sticky;
});