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(function($) {
'use strict';
let _defaults = {
top: 0,
bottom: Infinity,
offset: 0,
onPositionChange: null
};
/**
* @class
*
*/
class Pushpin extends Component {
/**
* Construct Pushpin instance
* @constructor
* @param {Element} el
* @param {Object} options
*/
constructor(el, options) {
super(Pushpin, el, options);
this.el.M_Pushpin = this;
/**
* Options for the modal
* @member Pushpin#options
*/
this.options = $.extend({}, Pushpin.defaults, options);
this.originalOffset = this.el.offsetTop;
Pushpin._pushpins.push(this);
this._setupEventHandlers();
this._updatePosition();
}
static get defaults() {
return _defaults;
}
static init(els, options) {
return super.init(this, els, options);
}
/**
* Get Instance
*/
static getInstance(el) {
let domElem = !!el.jquery ? el[0] : el;
return domElem.M_Pushpin;
}
/**
* Teardown component
*/
destroy() {
this.el.style.top = null;
this._removePinClasses();
this._removeEventHandlers();
// Remove pushpin Inst
let index = Pushpin._pushpins.indexOf(this);
Pushpin._pushpins.splice(index, 1);
}
static _updateElements() {
for (let elIndex in Pushpin._pushpins) {
let pInstance = Pushpin._pushpins[elIndex];
pInstance._updatePosition();
}
}
_setupEventHandlers() {
document.addEventListener('scroll', Pushpin._updateElements);
}
_removeEventHandlers() {
document.removeEventListener('scroll', Pushpin._updateElements);
}
_updatePosition() {
let scrolled = M.getDocumentScrollTop() + this.options.offset;
if (
this.options.top <= scrolled &&
this.options.bottom >= scrolled &&
!this.el.classList.contains('pinned')
) {
this._removePinClasses();
this.el.style.top = `${this.options.offset}px`;
this.el.classList.add('pinned');
// onPositionChange callback
if (typeof this.options.onPositionChange === 'function') {
this.options.onPositionChange.call(this, 'pinned');
}
}
// Add pin-top (when scrolled position is above top)
if (scrolled < this.options.top && !this.el.classList.contains('pin-top')) {
this._removePinClasses();
this.el.style.top = 0;
this.el.classList.add('pin-top');
// onPositionChange callback
if (typeof this.options.onPositionChange === 'function') {
this.options.onPositionChange.call(this, 'pin-top');
}
}
// Add pin-bottom (when scrolled position is below bottom)
if (scrolled > this.options.bottom && !this.el.classList.contains('pin-bottom')) {
this._removePinClasses();
this.el.classList.add('pin-bottom');
this.el.style.top = `${this.options.bottom - this.originalOffset}px`;
// onPositionChange callback
if (typeof this.options.onPositionChange === 'function') {
this.options.onPositionChange.call(this, 'pin-bottom');
}
}
}
_removePinClasses() {
// IE 11 bug (can't remove multiple classes in one line)
this.el.classList.remove('pin-top');
this.el.classList.remove('pinned');
this.el.classList.remove('pin-bottom');
}
}
/**
* @static
* @memberof Pushpin
*/
Pushpin._pushpins = [];
M.Pushpin = Pushpin;
if (M.jQueryLoaded) {
M.initializeJqueryWrapper(Pushpin, 'pushpin', 'M_Pushpin');
}
})(cash);
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