mirror of
https://github.com/jellyfin/jellyfin-web.git
synced 2024-11-19 03:48:18 -07:00
424 lines
13 KiB
JavaScript
424 lines
13 KiB
JavaScript
/*!
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* headroom.js v0.7.0 - Give your page some headroom. Hide your header until you need it
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* Copyright (c) 2014 Nick Williams - http://wicky.nillia.ms/headroom.js
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* License: MIT
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*/
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(function (window, document) {
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'use strict';
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/* exported features */
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var features = {
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bind: !!(function () { }.bind),
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classList: 'classList' in document.documentElement,
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rAF: !!(window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame)
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};
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window.requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
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/**
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* Handles debouncing of events via requestAnimationFrame
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* @see http://www.html5rocks.com/en/tutorials/speed/animations/
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* @param {Function} callback The callback to handle whichever event
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*/
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function Debouncer(callback) {
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this.callback = callback;
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this.ticking = false;
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}
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Debouncer.prototype = {
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constructor: Debouncer,
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/**
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* dispatches the event to the supplied callback
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* @private
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*/
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update: function () {
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this.callback && this.callback();
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this.ticking = false;
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},
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/**
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* ensures events don't get stacked
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* @private
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*/
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requestTick: function () {
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if (!this.ticking) {
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requestAnimationFrame(this.rafCallback || (this.rafCallback = this.update.bind(this)));
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this.ticking = true;
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}
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},
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/**
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* Attach this as the event listeners
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*/
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handleEvent: function () {
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this.requestTick();
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}
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};
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/**
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* Check if object is part of the DOM
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* @constructor
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* @param {Object} obj element to check
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*/
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function isDOMElement(obj) {
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return obj && typeof window !== 'undefined' && (obj === window || obj.nodeType);
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}
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/**
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* Helper function for extending objects
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*/
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function extend(object /*, objectN ... */) {
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if (arguments.length <= 0) {
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throw new Error('Missing arguments in extend function');
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}
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var result = object || {},
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key,
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i;
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for (i = 1; i < arguments.length; i++) {
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var replacement = arguments[i] || {};
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for (key in replacement) {
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// Recurse into object except if the object is a DOM element
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if (typeof result[key] === 'object' && !isDOMElement(result[key])) {
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result[key] = extend(result[key], replacement[key]);
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}
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else {
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result[key] = result[key] || replacement[key];
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}
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}
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}
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return result;
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}
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/**
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* Helper function for normalizing tolerance option to object format
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*/
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function normalizeTolerance(t) {
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return t === Object(t) ? t : { down: t, up: t };
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}
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var supportsCaptureOption = false;
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try {
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var opts = Object.defineProperty({}, 'capture', {
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get: function () {
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supportsCaptureOption = true;
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}
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});
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window.addEventListener("test", null, opts);
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} catch (e) { }
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function addEventListenerWithOptions(target, type, handler, options) {
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var optionsOrCapture = options;
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if (!supportsCaptureOption) {
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optionsOrCapture = options.capture;
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}
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target.addEventListener(type, handler, optionsOrCapture);
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}
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function removeEventListenerWithOptions(target, type, handler, options) {
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var optionsOrCapture = options;
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if (!supportsCaptureOption) {
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optionsOrCapture = options.capture;
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}
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target.removeEventListener(type, handler, optionsOrCapture);
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}
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/**
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* UI enhancement for fixed headers.
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* Hides header when scrolling down
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* Shows header when scrolling up
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* @constructor
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* @param {DOMElement} elem the header element
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* @param {Object} options options for the widget
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*/
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function Headroom(elem, options) {
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options = extend(options, Headroom.options);
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this.lastKnownScrollY = 0;
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this.elem = elem;
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this.debouncer = new Debouncer(this.update.bind(this));
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this.tolerance = normalizeTolerance(options.tolerance);
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this.classes = options.classes;
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this.offset = options.offset;
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this.scroller = options.scroller;
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this.initialised = false;
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this.onPin = options.onPin;
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this.onUnpin = options.onUnpin;
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this.onTop = options.onTop;
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this.onNotTop = options.onNotTop;
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}
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Headroom.prototype = {
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constructor: Headroom,
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/**
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* Initialises the widget
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*/
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init: function () {
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if (!Headroom.cutsTheMustard) {
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return;
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}
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this.elem.classList.add(this.classes.initial);
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this.attachEvent();
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return this;
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},
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/**
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* Unattaches events and removes any classes that were added
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*/
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destroy: function () {
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var classes = this.classes;
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this.initialised = false;
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this.elem.classList.remove(classes.unpinned, classes.pinned, classes.top, classes.initial);
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removeEventListenerWithOptions(this.scroller, 'scroll', this.debouncer, {
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capture: false,
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passive: true
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});
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},
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/**
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* Attaches the scroll event
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* @private
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*/
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attachEvent: function () {
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if (!this.initialised) {
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this.lastKnownScrollY = this.getScrollY();
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this.initialised = true;
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addEventListenerWithOptions(this.scroller, 'scroll', this.debouncer, {
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capture: false,
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passive: true
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});
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this.debouncer.handleEvent();
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}
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},
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/**
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* Unpins the header if it's currently pinned
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*/
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unpin: function () {
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var classList = this.elem.classList,
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classes = this.classes;
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if (classList.contains(classes.pinned) || !classList.contains(classes.unpinned)) {
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classList.add(classes.unpinned);
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classList.remove(classes.pinned);
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this.onUnpin && this.onUnpin.call(this);
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}
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},
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/**
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* Pins the header if it's currently unpinned
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*/
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pin: function () {
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var classList = this.elem.classList,
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classes = this.classes;
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if (classList.contains(classes.unpinned)) {
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classList.remove(classes.unpinned);
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classList.add(classes.pinned);
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this.onPin && this.onPin.call(this);
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}
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},
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/**
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* Handles the top states
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*/
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top: function () {
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var classList = this.elem.classList,
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classes = this.classes;
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if (!classList.contains(classes.top)) {
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classList.add(classes.top);
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classList.remove(classes.notTop);
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this.onTop && this.onTop.call(this);
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}
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},
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/**
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* Handles the not top state
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*/
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notTop: function () {
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var classList = this.elem.classList,
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classes = this.classes;
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if (!classList.contains(classes.notTop)) {
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classList.add(classes.notTop);
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classList.remove(classes.top);
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this.onNotTop && this.onNotTop.call(this);
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}
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},
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/**
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* Gets the Y scroll position
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* @see https://developer.mozilla.org/en-US/docs/Web/API/Window.scrollY
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* @return {Number} pixels the page has scrolled along the Y-axis
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*/
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getScrollY: function () {
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return (this.scroller.pageYOffset !== undefined)
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? this.scroller.pageYOffset
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: (this.scroller.scrollTop !== undefined)
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? this.scroller.scrollTop
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: (document.documentElement || document.body.parentNode || document.body).scrollTop;
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},
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/**
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* Gets the height of the viewport
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* @see http://andylangton.co.uk/blog/development/get-viewport-size-width-and-height-javascript
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* @return {int} the height of the viewport in pixels
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*/
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getViewportHeight: function () {
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return window.innerHeight
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|| document.documentElement.clientHeight
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|| document.body.clientHeight;
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},
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/**
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* Gets the height of the document
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* @see http://james.padolsey.com/javascript/get-document-height-cross-browser/
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* @return {int} the height of the document in pixels
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*/
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getDocumentHeight: function () {
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var body = document.body,
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documentElement = document.documentElement;
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return Math.max(
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body.scrollHeight, documentElement.scrollHeight,
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body.offsetHeight, documentElement.offsetHeight,
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body.clientHeight, documentElement.clientHeight
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);
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},
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/**
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* Gets the height of the DOM element
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* @param {Object} elm the element to calculate the height of which
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* @return {int} the height of the element in pixels
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*/
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getElementHeight: function (elm) {
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return Math.max(
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elm.scrollHeight,
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elm.offsetHeight,
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elm.clientHeight
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);
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},
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/**
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* Gets the height of the scroller element
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* @return {int} the height of the scroller element in pixels
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*/
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getScrollerHeight: function () {
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return (this.scroller === window || this.scroller === document.body)
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? this.getDocumentHeight()
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: this.getElementHeight(this.scroller);
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},
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/**
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* determines if the scroll position is outside of document boundaries
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* @param {int} currentScrollY the current y scroll position
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* @return {bool} true if out of bounds, false otherwise
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*/
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isOutOfBounds: function (currentScrollY) {
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var pastTop = currentScrollY < 0;
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if (pastTop) {
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return true;
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}
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var pastBottom = currentScrollY + this.getViewportHeight() > this.getScrollerHeight();
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return pastBottom;
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},
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/**
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* determines if the tolerance has been exceeded
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* @param {int} currentScrollY the current scroll y position
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* @return {bool} true if tolerance exceeded, false otherwise
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*/
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toleranceExceeded: function (currentScrollY, direction) {
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return Math.abs(currentScrollY - this.lastKnownScrollY) >= this.tolerance[direction];
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},
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/**
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* determine if it is appropriate to unpin
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* @param {int} currentScrollY the current y scroll position
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* @param {bool} toleranceExceeded has the tolerance been exceeded?
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* @return {bool} true if should unpin, false otherwise
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*/
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shouldUnpin: function (currentScrollY, toleranceExceeded) {
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var scrollingDown = currentScrollY > this.lastKnownScrollY,
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pastOffset = currentScrollY >= this.offset;
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return scrollingDown && pastOffset && toleranceExceeded;
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},
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/**
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* determine if it is appropriate to pin
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* @param {int} currentScrollY the current y scroll position
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* @param {bool} toleranceExceeded has the tolerance been exceeded?
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* @return {bool} true if should pin, false otherwise
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*/
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shouldPin: function (currentScrollY, toleranceExceeded) {
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var scrollingUp = currentScrollY < this.lastKnownScrollY,
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pastOffset = currentScrollY <= this.offset;
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return (scrollingUp && toleranceExceeded) || pastOffset;
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},
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/**
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* Handles updating the state of the widget
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*/
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update: function () {
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var currentScrollY = this.getScrollY(),
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scrollDirection = currentScrollY > this.lastKnownScrollY ? 'down' : 'up',
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toleranceExceeded = this.toleranceExceeded(currentScrollY, scrollDirection);
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if (this.isOutOfBounds(currentScrollY)) { // Ignore bouncy scrolling in OSX
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return;
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}
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if (currentScrollY <= this.offset) {
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this.top();
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} else {
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this.notTop();
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}
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if (this.shouldUnpin(currentScrollY, toleranceExceeded)) {
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this.unpin();
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}
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else if (this.shouldPin(currentScrollY, toleranceExceeded)) {
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this.pin();
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}
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this.lastKnownScrollY = currentScrollY;
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}
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};
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/**
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* Default options
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* @type {Object}
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*/
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Headroom.options = {
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tolerance: {
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up: 0,
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down: 0
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},
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offset: 0,
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scroller: window,
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classes: {
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pinned: 'headroom--pinned',
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unpinned: 'headroom--unpinned',
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top: 'headroom--top',
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notTop: 'headroom--not-top',
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initial: 'headroom'
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}
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};
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Headroom.cutsTheMustard = typeof features !== 'undefined' && features.rAF && features.bind && features.classList;
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window.Headroom = Headroom;
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}(window, document)); |