1771 lines
47 KiB
JavaScript
1771 lines
47 KiB
JavaScript
/*!
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* skrollr core
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*
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* Alexander Prinzhorn - https://github.com/Prinzhorn/skrollr
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*
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* Free to use under terms of MIT license
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*/
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(function(window, document, undefined) {
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'use strict';
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/*
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* Global api.
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*/
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var skrollr = {
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get: function() {
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return _instance;
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},
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//Main entry point.
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init: function(options) {
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return _instance || new Skrollr(options);
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},
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VERSION: '0.6.26'
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};
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//Minify optimization.
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var hasProp = Object.prototype.hasOwnProperty;
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var Math = window.Math;
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var getStyle = window.getComputedStyle;
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//They will be filled when skrollr gets initialized.
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var documentElement;
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var body;
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var EVENT_TOUCHSTART = 'touchstart';
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var EVENT_TOUCHMOVE = 'touchmove';
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var EVENT_TOUCHCANCEL = 'touchcancel';
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var EVENT_TOUCHEND = 'touchend';
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var SKROLLABLE_CLASS = 'skrollable';
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var SKROLLABLE_BEFORE_CLASS = SKROLLABLE_CLASS + '-before';
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var SKROLLABLE_BETWEEN_CLASS = SKROLLABLE_CLASS + '-between';
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var SKROLLABLE_AFTER_CLASS = SKROLLABLE_CLASS + '-after';
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var SKROLLR_CLASS = 'skrollr';
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var NO_SKROLLR_CLASS = 'no-' + SKROLLR_CLASS;
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var SKROLLR_DESKTOP_CLASS = SKROLLR_CLASS + '-desktop';
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var SKROLLR_MOBILE_CLASS = SKROLLR_CLASS + '-mobile';
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var DEFAULT_EASING = 'linear';
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var DEFAULT_DURATION = 1000;//ms
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var DEFAULT_MOBILE_DECELERATION = 0.004;//pixel/ms²
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var DEFAULT_SMOOTH_SCROLLING_DURATION = 200;//ms
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var ANCHOR_START = 'start';
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var ANCHOR_END = 'end';
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var ANCHOR_CENTER = 'center';
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var ANCHOR_BOTTOM = 'bottom';
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//The property which will be added to the DOM element to hold the ID of the skrollable.
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var SKROLLABLE_ID_DOM_PROPERTY = '___skrollable_id';
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var rxTouchIgnoreTags = /^(?:input|textarea|button|select)$/i;
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var rxTrim = /^\s+|\s+$/g;
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//Find all data-attributes. data-[_constant]-[offset]-[anchor]-[anchor].
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var rxKeyframeAttribute = /^data(?:-(_\w+))?(?:-?(-?\d*\.?\d+p?))?(?:-?(start|end|top|center|bottom))?(?:-?(top|center|bottom))?$/;
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var rxPropValue = /\s*(@?[\w\-\[\]]+)\s*:\s*(.+?)\s*(?:;|$)/gi;
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//Easing function names follow the property in square brackets.
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var rxPropEasing = /^(@?[a-z\-]+)\[(\w+)\]$/;
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var rxCamelCase = /-([a-z0-9_])/g;
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var rxCamelCaseFn = function(str, letter) {
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return letter.toUpperCase();
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};
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//Numeric values with optional sign.
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var rxNumericValue = /[\-+]?[\d]*\.?[\d]+/g;
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//Used to replace occurences of {?} with a number.
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var rxInterpolateString = /\{\?\}/g;
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//Finds rgb(a) colors, which don't use the percentage notation.
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var rxRGBAIntegerColor = /rgba?\(\s*-?\d+\s*,\s*-?\d+\s*,\s*-?\d+/g;
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//Finds all gradients.
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var rxGradient = /[a-z\-]+-gradient/g;
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//Vendor prefix. Will be set once skrollr gets initialized.
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var theCSSPrefix = '';
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var theDashedCSSPrefix = '';
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//Will be called once (when skrollr gets initialized).
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var detectCSSPrefix = function() {
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//Only relevant prefixes. May be extended.
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//Could be dangerous if there will ever be a CSS property which actually starts with "ms". Don't hope so.
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var rxPrefixes = /^(?:O|Moz|webkit|ms)|(?:-(?:o|moz|webkit|ms)-)/;
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//Detect prefix for current browser by finding the first property using a prefix.
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if(!getStyle) {
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return;
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}
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var style = getStyle(body, null);
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for(var k in style) {
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//We check the key and if the key is a number, we check the value as well, because safari's getComputedStyle returns some weird array-like thingy.
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theCSSPrefix = (k.match(rxPrefixes) || (+k == k && style[k].match(rxPrefixes)));
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if(theCSSPrefix) {
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break;
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}
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}
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//Did we even detect a prefix?
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if(!theCSSPrefix) {
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theCSSPrefix = theDashedCSSPrefix = '';
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return;
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}
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theCSSPrefix = theCSSPrefix[0];
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//We could have detected either a dashed prefix or this camelCaseish-inconsistent stuff.
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if(theCSSPrefix.slice(0,1) === '-') {
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theDashedCSSPrefix = theCSSPrefix;
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//There's no logic behind these. Need a look up.
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theCSSPrefix = ({
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'-webkit-': 'webkit',
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'-moz-': 'Moz',
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'-ms-': 'ms',
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'-o-': 'O'
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})[theCSSPrefix];
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} else {
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theDashedCSSPrefix = '-' + theCSSPrefix.toLowerCase() + '-';
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}
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};
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var polyfillRAF = function() {
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var requestAnimFrame = window.requestAnimationFrame || window[theCSSPrefix.toLowerCase() + 'RequestAnimationFrame'];
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var lastTime = _now();
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if(_isMobile || !requestAnimFrame) {
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requestAnimFrame = function(callback) {
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//How long did it take to render?
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var deltaTime = _now() - lastTime;
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var delay = Math.max(0, 1000 / 60 - deltaTime);
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return window.setTimeout(function() {
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lastTime = _now();
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callback();
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}, delay);
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};
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}
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return requestAnimFrame;
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};
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var polyfillCAF = function() {
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var cancelAnimFrame = window.cancelAnimationFrame || window[theCSSPrefix.toLowerCase() + 'CancelAnimationFrame'];
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if(_isMobile || !cancelAnimFrame) {
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cancelAnimFrame = function(timeout) {
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return window.clearTimeout(timeout);
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};
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}
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return cancelAnimFrame;
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};
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//Built-in easing functions.
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var easings = {
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begin: function() {
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return 0;
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},
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end: function() {
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return 1;
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},
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linear: function(p) {
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return p;
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},
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quadratic: function(p) {
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return p * p;
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},
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cubic: function(p) {
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return p * p * p;
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},
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swing: function(p) {
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return (-Math.cos(p * Math.PI) / 2) + 0.5;
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},
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sqrt: function(p) {
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return Math.sqrt(p);
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},
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outCubic: function(p) {
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return (Math.pow((p - 1), 3) + 1);
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},
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//see https://www.desmos.com/calculator/tbr20s8vd2 for how I did this
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bounce: function(p) {
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var a;
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if(p <= 0.5083) {
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a = 3;
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} else if(p <= 0.8489) {
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a = 9;
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} else if(p <= 0.96208) {
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a = 27;
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} else if(p <= 0.99981) {
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a = 91;
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} else {
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return 1;
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}
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return 1 - Math.abs(3 * Math.cos(p * a * 1.028) / a);
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}
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};
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/**
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* Constructor.
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*/
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function Skrollr(options) {
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documentElement = document.documentElement;
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body = document.body;
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detectCSSPrefix();
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_instance = this;
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options = options || {};
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_constants = options.constants || {};
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//We allow defining custom easings or overwrite existing.
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if(options.easing) {
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for(var e in options.easing) {
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easings[e] = options.easing[e];
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}
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}
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_edgeStrategy = options.edgeStrategy || 'set';
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_listeners = {
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//Function to be called right before rendering.
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beforerender: options.beforerender,
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//Function to be called right after finishing rendering.
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render: options.render,
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//Function to be called whenever an element with the `data-emit-events` attribute passes a keyframe.
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keyframe: options.keyframe
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};
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//forceHeight is true by default
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_forceHeight = options.forceHeight !== false;
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if(_forceHeight) {
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_scale = options.scale || 1;
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}
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_mobileDeceleration = options.mobileDeceleration || DEFAULT_MOBILE_DECELERATION;
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_smoothScrollingEnabled = options.smoothScrolling !== false;
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_smoothScrollingDuration = options.smoothScrollingDuration || DEFAULT_SMOOTH_SCROLLING_DURATION;
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//Dummy object. Will be overwritten in the _render method when smooth scrolling is calculated.
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_smoothScrolling = {
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targetTop: _instance.getScrollTop()
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};
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//A custom check function may be passed.
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_isMobile = ((options.mobileCheck || function() {
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return (/Android|iPhone|iPad|iPod|BlackBerry/i).test(navigator.userAgent || navigator.vendor || window.opera);
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})());
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if(_isMobile) {
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_skrollrBody = document.getElementById('skrollr-body');
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//Detect 3d transform if there's a skrollr-body (only needed for #skrollr-body).
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if(_skrollrBody) {
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_detect3DTransforms();
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}
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_initMobile();
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_updateClass(documentElement, [SKROLLR_CLASS, SKROLLR_MOBILE_CLASS], [NO_SKROLLR_CLASS]);
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} else {
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_updateClass(documentElement, [SKROLLR_CLASS, SKROLLR_DESKTOP_CLASS], [NO_SKROLLR_CLASS]);
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}
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//Triggers parsing of elements and a first reflow.
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_instance.refresh();
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_addEvent(window, 'resize orientationchange', function() {
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var width = documentElement.clientWidth;
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var height = documentElement.clientHeight;
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//Only reflow if the size actually changed (#271).
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if(height !== _lastViewportHeight || width !== _lastViewportWidth) {
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_lastViewportHeight = height;
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_lastViewportWidth = width;
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_requestReflow = true;
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}
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});
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var requestAnimFrame = polyfillRAF();
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//Let's go.
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(function animloop(){
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_render();
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_animFrame = requestAnimFrame(animloop);
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}());
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return _instance;
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}
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/**
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* (Re)parses some or all elements.
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*/
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Skrollr.prototype.refresh = function(elements) {
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var elementIndex;
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var elementsLength;
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var ignoreID = false;
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//Completely reparse anything without argument.
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if(elements === undefined) {
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//Ignore that some elements may already have a skrollable ID.
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ignoreID = true;
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_skrollables = [];
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_skrollableIdCounter = 0;
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elements = document.getElementsByTagName('*');
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} else if(elements.length === undefined) {
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//We also accept a single element as parameter.
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elements = [elements];
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}
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elementIndex = 0;
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elementsLength = elements.length;
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for(; elementIndex < elementsLength; elementIndex++) {
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var el = elements[elementIndex];
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var anchorTarget = el;
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var keyFrames = [];
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//If this particular element should be smooth scrolled.
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var smoothScrollThis = _smoothScrollingEnabled;
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//The edge strategy for this particular element.
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var edgeStrategy = _edgeStrategy;
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//If this particular element should emit keyframe events.
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var emitEvents = false;
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//If we're reseting the counter, remove any old element ids that may be hanging around.
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if(ignoreID && SKROLLABLE_ID_DOM_PROPERTY in el) {
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delete el[SKROLLABLE_ID_DOM_PROPERTY];
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}
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if(!el.attributes) {
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continue;
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}
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//Iterate over all attributes and search for key frame attributes.
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var attributeIndex = 0;
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var attributesLength = el.attributes.length;
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for (; attributeIndex < attributesLength; attributeIndex++) {
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var attr = el.attributes[attributeIndex];
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if(attr.name === 'data-anchor-target') {
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anchorTarget = document.querySelector(attr.value);
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if(anchorTarget === null) {
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throw 'Unable to find anchor target "' + attr.value + '"';
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}
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continue;
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}
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//Global smooth scrolling can be overridden by the element attribute.
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if(attr.name === 'data-smooth-scrolling') {
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smoothScrollThis = attr.value !== 'off';
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continue;
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}
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//Global edge strategy can be overridden by the element attribute.
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if(attr.name === 'data-edge-strategy') {
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edgeStrategy = attr.value;
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continue;
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}
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//Is this element tagged with the `data-emit-events` attribute?
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if(attr.name === 'data-emit-events') {
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emitEvents = true;
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continue;
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}
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var match = attr.name.match(rxKeyframeAttribute);
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if(match === null) {
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continue;
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}
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var kf = {
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props: attr.value,
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//Point back to the element as well.
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element: el,
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//The name of the event which this keyframe will fire, if emitEvents is
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eventType: attr.name.replace(rxCamelCase, rxCamelCaseFn)
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};
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keyFrames.push(kf);
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var constant = match[1];
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if(constant) {
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//Strip the underscore prefix.
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kf.constant = constant.substr(1);
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}
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//Get the key frame offset.
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var offset = match[2];
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//Is it a percentage offset?
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if(/p$/.test(offset)) {
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kf.isPercentage = true;
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kf.offset = (offset.slice(0, -1) | 0) / 100;
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} else {
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kf.offset = (offset | 0);
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}
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var anchor1 = match[3];
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//If second anchor is not set, the first will be taken for both.
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var anchor2 = match[4] || anchor1;
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//"absolute" (or "classic") mode, where numbers mean absolute scroll offset.
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if(!anchor1 || anchor1 === ANCHOR_START || anchor1 === ANCHOR_END) {
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kf.mode = 'absolute';
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//data-end needs to be calculated after all key frames are known.
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if(anchor1 === ANCHOR_END) {
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kf.isEnd = true;
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} else if(!kf.isPercentage) {
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//For data-start we can already set the key frame w/o calculations.
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//#59: "scale" options should only affect absolute mode.
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kf.offset = kf.offset * _scale;
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}
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}
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//"relative" mode, where numbers are relative to anchors.
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else {
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kf.mode = 'relative';
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kf.anchors = [anchor1, anchor2];
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}
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}
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//Does this element have key frames?
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if(!keyFrames.length) {
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continue;
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}
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//Will hold the original style and class attributes before we controlled the element (see #80).
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var styleAttr, classAttr;
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var id;
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if(!ignoreID && SKROLLABLE_ID_DOM_PROPERTY in el) {
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//We already have this element under control. Grab the corresponding skrollable id.
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id = el[SKROLLABLE_ID_DOM_PROPERTY];
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styleAttr = _skrollables[id].styleAttr;
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classAttr = _skrollables[id].classAttr;
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} else {
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//It's an unknown element. Asign it a new skrollable id.
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id = (el[SKROLLABLE_ID_DOM_PROPERTY] = _skrollableIdCounter++);
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styleAttr = el.style.cssText;
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classAttr = _getClass(el);
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}
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_skrollables[id] = {
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element: el,
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styleAttr: styleAttr,
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classAttr: classAttr,
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anchorTarget: anchorTarget,
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keyFrames: keyFrames,
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smoothScrolling: smoothScrollThis,
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edgeStrategy: edgeStrategy,
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emitEvents: emitEvents,
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lastFrameIndex: -1
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};
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_updateClass(el, [SKROLLABLE_CLASS], []);
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}
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//Reflow for the first time.
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_reflow();
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//Now that we got all key frame numbers right, actually parse the properties.
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elementIndex = 0;
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elementsLength = elements.length;
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for(; elementIndex < elementsLength; elementIndex++) {
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var sk = _skrollables[elements[elementIndex][SKROLLABLE_ID_DOM_PROPERTY]];
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if(sk === undefined) {
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continue;
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}
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//Parse the property string to objects
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_parseProps(sk);
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//Fill key frames with missing properties from left and right
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_fillProps(sk);
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}
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return _instance;
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};
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/**
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* Transform "relative" mode to "absolute" mode.
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* That is, calculate anchor position and offset of element.
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*/
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Skrollr.prototype.relativeToAbsolute = function(element, viewportAnchor, elementAnchor) {
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var viewportHeight = documentElement.clientHeight;
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var box = element.getBoundingClientRect();
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var absolute = box.top;
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//#100: IE doesn't supply "height" with getBoundingClientRect.
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var boxHeight = box.bottom - box.top;
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if(viewportAnchor === ANCHOR_BOTTOM) {
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absolute -= viewportHeight;
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} else if(viewportAnchor === ANCHOR_CENTER) {
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absolute -= viewportHeight / 2;
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}
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if(elementAnchor === ANCHOR_BOTTOM) {
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absolute += boxHeight;
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} else if(elementAnchor === ANCHOR_CENTER) {
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absolute += boxHeight / 2;
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}
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//Compensate scrolling since getBoundingClientRect is relative to viewport.
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absolute += _instance.getScrollTop();
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return (absolute + 0.5) | 0;
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};
|
|
|
|
/**
|
|
* Animates scroll top to new position.
|
|
*/
|
|
Skrollr.prototype.animateTo = function(top, options) {
|
|
options = options || {};
|
|
|
|
var now = _now();
|
|
var scrollTop = _instance.getScrollTop();
|
|
|
|
//Setting this to a new value will automatically cause the current animation to stop, if any.
|
|
_scrollAnimation = {
|
|
startTop: scrollTop,
|
|
topDiff: top - scrollTop,
|
|
targetTop: top,
|
|
duration: options.duration || DEFAULT_DURATION,
|
|
startTime: now,
|
|
endTime: now + (options.duration || DEFAULT_DURATION),
|
|
easing: easings[options.easing || DEFAULT_EASING],
|
|
done: options.done
|
|
};
|
|
|
|
//Don't queue the animation if there's nothing to animate.
|
|
if(!_scrollAnimation.topDiff) {
|
|
if(_scrollAnimation.done) {
|
|
_scrollAnimation.done.call(_instance, false);
|
|
}
|
|
|
|
_scrollAnimation = undefined;
|
|
}
|
|
|
|
return _instance;
|
|
};
|
|
|
|
/**
|
|
* Stops animateTo animation.
|
|
*/
|
|
Skrollr.prototype.stopAnimateTo = function() {
|
|
if(_scrollAnimation && _scrollAnimation.done) {
|
|
_scrollAnimation.done.call(_instance, true);
|
|
}
|
|
|
|
_scrollAnimation = undefined;
|
|
};
|
|
|
|
/**
|
|
* Returns if an animation caused by animateTo is currently running.
|
|
*/
|
|
Skrollr.prototype.isAnimatingTo = function() {
|
|
return !!_scrollAnimation;
|
|
};
|
|
|
|
Skrollr.prototype.isMobile = function() {
|
|
return _isMobile;
|
|
};
|
|
|
|
Skrollr.prototype.setScrollTop = function(top, force) {
|
|
_forceRender = (force === true);
|
|
|
|
if(_isMobile) {
|
|
_mobileOffset = Math.min(Math.max(top, 0), _maxKeyFrame);
|
|
} else {
|
|
window.scrollTo(0, top);
|
|
}
|
|
|
|
return _instance;
|
|
};
|
|
|
|
Skrollr.prototype.getScrollTop = function() {
|
|
if(_isMobile) {
|
|
return _mobileOffset;
|
|
} else {
|
|
return window.pageYOffset || documentElement.scrollTop || body.scrollTop || 0;
|
|
}
|
|
};
|
|
|
|
Skrollr.prototype.getMaxScrollTop = function() {
|
|
return _maxKeyFrame;
|
|
};
|
|
|
|
Skrollr.prototype.on = function(name, fn) {
|
|
_listeners[name] = fn;
|
|
|
|
return _instance;
|
|
};
|
|
|
|
Skrollr.prototype.off = function(name) {
|
|
delete _listeners[name];
|
|
|
|
return _instance;
|
|
};
|
|
|
|
Skrollr.prototype.destroy = function() {
|
|
var cancelAnimFrame = polyfillCAF();
|
|
cancelAnimFrame(_animFrame);
|
|
_removeAllEvents();
|
|
|
|
_updateClass(documentElement, [NO_SKROLLR_CLASS], [SKROLLR_CLASS, SKROLLR_DESKTOP_CLASS, SKROLLR_MOBILE_CLASS]);
|
|
|
|
var skrollableIndex = 0;
|
|
var skrollablesLength = _skrollables.length;
|
|
|
|
for(; skrollableIndex < skrollablesLength; skrollableIndex++) {
|
|
_reset(_skrollables[skrollableIndex].element);
|
|
}
|
|
|
|
documentElement.style.overflow = body.style.overflow = '';
|
|
documentElement.style.height = body.style.height = '';
|
|
|
|
if(_skrollrBody) {
|
|
skrollr.setStyle(_skrollrBody, 'transform', 'none');
|
|
}
|
|
|
|
_instance = undefined;
|
|
_skrollrBody = undefined;
|
|
_listeners = undefined;
|
|
_forceHeight = undefined;
|
|
_maxKeyFrame = 0;
|
|
_scale = 1;
|
|
_constants = undefined;
|
|
_mobileDeceleration = undefined;
|
|
_direction = 'down';
|
|
_lastTop = -1;
|
|
_lastViewportWidth = 0;
|
|
_lastViewportHeight = 0;
|
|
_requestReflow = false;
|
|
_scrollAnimation = undefined;
|
|
_smoothScrollingEnabled = undefined;
|
|
_smoothScrollingDuration = undefined;
|
|
_smoothScrolling = undefined;
|
|
_forceRender = undefined;
|
|
_skrollableIdCounter = 0;
|
|
_edgeStrategy = undefined;
|
|
_isMobile = false;
|
|
_mobileOffset = 0;
|
|
_translateZ = undefined;
|
|
};
|
|
|
|
/*
|
|
Private methods.
|
|
*/
|
|
|
|
var _initMobile = function() {
|
|
var initialElement;
|
|
var initialTouchY;
|
|
var initialTouchX;
|
|
var currentElement;
|
|
var currentTouchY;
|
|
var currentTouchX;
|
|
var lastTouchY;
|
|
var deltaY;
|
|
|
|
var initialTouchTime;
|
|
var currentTouchTime;
|
|
var lastTouchTime;
|
|
var deltaTime;
|
|
|
|
_addEvent(documentElement, [EVENT_TOUCHSTART, EVENT_TOUCHMOVE, EVENT_TOUCHCANCEL, EVENT_TOUCHEND].join(' '), function(e) {
|
|
var touch = e.changedTouches[0];
|
|
|
|
currentElement = e.target;
|
|
|
|
//We don't want text nodes.
|
|
while(currentElement.nodeType === 3) {
|
|
currentElement = currentElement.parentNode;
|
|
}
|
|
|
|
currentTouchY = touch.clientY;
|
|
currentTouchX = touch.clientX;
|
|
currentTouchTime = e.timeStamp;
|
|
|
|
if(!rxTouchIgnoreTags.test(currentElement.tagName)) {
|
|
e.preventDefault();
|
|
}
|
|
|
|
switch(e.type) {
|
|
case EVENT_TOUCHSTART:
|
|
//The last element we tapped on.
|
|
if(initialElement) {
|
|
initialElement.blur();
|
|
}
|
|
|
|
_instance.stopAnimateTo();
|
|
|
|
initialElement = currentElement;
|
|
|
|
initialTouchY = lastTouchY = currentTouchY;
|
|
initialTouchX = currentTouchX;
|
|
initialTouchTime = currentTouchTime;
|
|
|
|
break;
|
|
case EVENT_TOUCHMOVE:
|
|
//Prevent default event on touchIgnore elements in case they don't have focus yet.
|
|
if(rxTouchIgnoreTags.test(currentElement.tagName) && document.activeElement !== currentElement) {
|
|
e.preventDefault();
|
|
}
|
|
|
|
deltaY = currentTouchY - lastTouchY;
|
|
deltaTime = currentTouchTime - lastTouchTime;
|
|
|
|
_instance.setScrollTop(_mobileOffset - deltaY, true);
|
|
|
|
lastTouchY = currentTouchY;
|
|
lastTouchTime = currentTouchTime;
|
|
break;
|
|
default:
|
|
case EVENT_TOUCHCANCEL:
|
|
case EVENT_TOUCHEND:
|
|
var distanceY = initialTouchY - currentTouchY;
|
|
var distanceX = initialTouchX - currentTouchX;
|
|
var distance2 = distanceX * distanceX + distanceY * distanceY;
|
|
|
|
//Check if it was more like a tap (moved less than 7px).
|
|
if(distance2 < 49) {
|
|
if(!rxTouchIgnoreTags.test(initialElement.tagName)) {
|
|
initialElement.focus();
|
|
|
|
//It was a tap, click the element.
|
|
var clickEvent = document.createEvent('MouseEvents');
|
|
clickEvent.initMouseEvent('click', true, true, e.view, 1, touch.screenX, touch.screenY, touch.clientX, touch.clientY, e.ctrlKey, e.altKey, e.shiftKey, e.metaKey, 0, null);
|
|
initialElement.dispatchEvent(clickEvent);
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
initialElement = undefined;
|
|
|
|
var speed = deltaY / deltaTime;
|
|
|
|
//Cap speed at 3 pixel/ms.
|
|
speed = Math.max(Math.min(speed, 3), -3);
|
|
|
|
var duration = Math.abs(speed / _mobileDeceleration);
|
|
var targetOffset = speed * duration + 0.5 * _mobileDeceleration * duration * duration;
|
|
var targetTop = _instance.getScrollTop() - targetOffset;
|
|
|
|
//Relative duration change for when scrolling above bounds.
|
|
var targetRatio = 0;
|
|
|
|
//Change duration proportionally when scrolling would leave bounds.
|
|
if(targetTop > _maxKeyFrame) {
|
|
targetRatio = (_maxKeyFrame - targetTop) / targetOffset;
|
|
|
|
targetTop = _maxKeyFrame;
|
|
} else if(targetTop < 0) {
|
|
targetRatio = -targetTop / targetOffset;
|
|
|
|
targetTop = 0;
|
|
}
|
|
|
|
duration = duration * (1 - targetRatio);
|
|
|
|
_instance.animateTo((targetTop + 0.5) | 0, {easing: 'outCubic', duration: duration});
|
|
break;
|
|
}
|
|
});
|
|
|
|
//Just in case there has already been some native scrolling, reset it.
|
|
window.scrollTo(0, 0);
|
|
documentElement.style.overflow = body.style.overflow = 'hidden';
|
|
};
|
|
|
|
/**
|
|
* Updates key frames which depend on others / need to be updated on resize.
|
|
* That is "end" in "absolute" mode and all key frames in "relative" mode.
|
|
* Also handles constants, because they may change on resize.
|
|
*/
|
|
var _updateDependentKeyFrames = function() {
|
|
var viewportHeight = documentElement.clientHeight;
|
|
var processedConstants = _processConstants();
|
|
var skrollable;
|
|
var element;
|
|
var anchorTarget;
|
|
var keyFrames;
|
|
var keyFrameIndex;
|
|
var keyFramesLength;
|
|
var kf;
|
|
var skrollableIndex;
|
|
var skrollablesLength;
|
|
var offset;
|
|
var constantValue;
|
|
|
|
//First process all relative-mode elements and find the max key frame.
|
|
skrollableIndex = 0;
|
|
skrollablesLength = _skrollables.length;
|
|
|
|
for(; skrollableIndex < skrollablesLength; skrollableIndex++) {
|
|
skrollable = _skrollables[skrollableIndex];
|
|
element = skrollable.element;
|
|
anchorTarget = skrollable.anchorTarget;
|
|
keyFrames = skrollable.keyFrames;
|
|
|
|
keyFrameIndex = 0;
|
|
keyFramesLength = keyFrames.length;
|
|
|
|
for(; keyFrameIndex < keyFramesLength; keyFrameIndex++) {
|
|
kf = keyFrames[keyFrameIndex];
|
|
|
|
offset = kf.offset;
|
|
constantValue = processedConstants[kf.constant] || 0;
|
|
|
|
kf.frame = offset;
|
|
|
|
if(kf.isPercentage) {
|
|
//Convert the offset to percentage of the viewport height.
|
|
offset = offset * viewportHeight;
|
|
|
|
//Absolute + percentage mode.
|
|
kf.frame = offset;
|
|
}
|
|
|
|
if(kf.mode === 'relative') {
|
|
_reset(element);
|
|
|
|
kf.frame = _instance.relativeToAbsolute(anchorTarget, kf.anchors[0], kf.anchors[1]) - offset;
|
|
|
|
_reset(element, true);
|
|
}
|
|
|
|
kf.frame += constantValue;
|
|
|
|
//Only search for max key frame when forceHeight is enabled.
|
|
if(_forceHeight) {
|
|
//Find the max key frame, but don't use one of the data-end ones for comparison.
|
|
if(!kf.isEnd && kf.frame > _maxKeyFrame) {
|
|
_maxKeyFrame = kf.frame;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
//#133: The document can be larger than the maxKeyFrame we found.
|
|
_maxKeyFrame = Math.max(_maxKeyFrame, _getDocumentHeight());
|
|
|
|
//Now process all data-end keyframes.
|
|
skrollableIndex = 0;
|
|
skrollablesLength = _skrollables.length;
|
|
|
|
for(; skrollableIndex < skrollablesLength; skrollableIndex++) {
|
|
skrollable = _skrollables[skrollableIndex];
|
|
keyFrames = skrollable.keyFrames;
|
|
|
|
keyFrameIndex = 0;
|
|
keyFramesLength = keyFrames.length;
|
|
|
|
for(; keyFrameIndex < keyFramesLength; keyFrameIndex++) {
|
|
kf = keyFrames[keyFrameIndex];
|
|
|
|
constantValue = processedConstants[kf.constant] || 0;
|
|
|
|
if(kf.isEnd) {
|
|
kf.frame = _maxKeyFrame - kf.offset + constantValue;
|
|
}
|
|
}
|
|
|
|
skrollable.keyFrames.sort(_keyFrameComparator);
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Calculates and sets the style properties for the element at the given frame.
|
|
* @param fakeFrame The frame to render at when smooth scrolling is enabled.
|
|
* @param actualFrame The actual frame we are at.
|
|
*/
|
|
var _calcSteps = function(fakeFrame, actualFrame) {
|
|
//Iterate over all skrollables.
|
|
var skrollableIndex = 0;
|
|
var skrollablesLength = _skrollables.length;
|
|
|
|
for(; skrollableIndex < skrollablesLength; skrollableIndex++) {
|
|
var skrollable = _skrollables[skrollableIndex];
|
|
var element = skrollable.element;
|
|
var frame = skrollable.smoothScrolling ? fakeFrame : actualFrame;
|
|
var frames = skrollable.keyFrames;
|
|
var framesLength = frames.length;
|
|
var firstFrame = frames[0];
|
|
var lastFrame = frames[frames.length - 1];
|
|
var beforeFirst = frame < firstFrame.frame;
|
|
var afterLast = frame > lastFrame.frame;
|
|
var firstOrLastFrame = beforeFirst ? firstFrame : lastFrame;
|
|
var emitEvents = skrollable.emitEvents;
|
|
var lastFrameIndex = skrollable.lastFrameIndex;
|
|
var key;
|
|
var value;
|
|
|
|
//If we are before/after the first/last frame, set the styles according to the given edge strategy.
|
|
if(beforeFirst || afterLast) {
|
|
//Check if we already handled this edge case last time.
|
|
//Note: using setScrollTop it's possible that we jumped from one edge to the other.
|
|
if(beforeFirst && skrollable.edge === -1 || afterLast && skrollable.edge === 1) {
|
|
continue;
|
|
}
|
|
|
|
//Add the skrollr-before or -after class.
|
|
if(beforeFirst) {
|
|
_updateClass(element, [SKROLLABLE_BEFORE_CLASS], [SKROLLABLE_AFTER_CLASS, SKROLLABLE_BETWEEN_CLASS]);
|
|
|
|
//This handles the special case where we exit the first keyframe.
|
|
if(emitEvents && lastFrameIndex > -1) {
|
|
_emitEvent(element, firstFrame.eventType, _direction);
|
|
skrollable.lastFrameIndex = -1;
|
|
}
|
|
} else {
|
|
_updateClass(element, [SKROLLABLE_AFTER_CLASS], [SKROLLABLE_BEFORE_CLASS, SKROLLABLE_BETWEEN_CLASS]);
|
|
|
|
//This handles the special case where we exit the last keyframe.
|
|
if(emitEvents && lastFrameIndex < framesLength) {
|
|
_emitEvent(element, lastFrame.eventType, _direction);
|
|
skrollable.lastFrameIndex = framesLength;
|
|
}
|
|
}
|
|
|
|
//Remember that we handled the edge case (before/after the first/last keyframe).
|
|
skrollable.edge = beforeFirst ? -1 : 1;
|
|
|
|
switch(skrollable.edgeStrategy) {
|
|
case 'reset':
|
|
_reset(element);
|
|
continue;
|
|
case 'ease':
|
|
//Handle this case like it would be exactly at first/last keyframe and just pass it on.
|
|
frame = firstOrLastFrame.frame;
|
|
break;
|
|
default:
|
|
case 'set':
|
|
var props = firstOrLastFrame.props;
|
|
|
|
for(key in props) {
|
|
if(hasProp.call(props, key)) {
|
|
value = _interpolateString(props[key].value);
|
|
|
|
//Set style or attribute.
|
|
if(key.indexOf('@') === 0) {
|
|
element.setAttribute(key.substr(1), value);
|
|
} else {
|
|
skrollr.setStyle(element, key, value);
|
|
}
|
|
}
|
|
}
|
|
|
|
continue;
|
|
}
|
|
} else {
|
|
//Did we handle an edge last time?
|
|
if(skrollable.edge !== 0) {
|
|
_updateClass(element, [SKROLLABLE_CLASS, SKROLLABLE_BETWEEN_CLASS], [SKROLLABLE_BEFORE_CLASS, SKROLLABLE_AFTER_CLASS]);
|
|
skrollable.edge = 0;
|
|
}
|
|
}
|
|
|
|
//Find out between which two key frames we are right now.
|
|
var keyFrameIndex = 0;
|
|
|
|
for(; keyFrameIndex < framesLength - 1; keyFrameIndex++) {
|
|
if(frame >= frames[keyFrameIndex].frame && frame <= frames[keyFrameIndex + 1].frame) {
|
|
var left = frames[keyFrameIndex];
|
|
var right = frames[keyFrameIndex + 1];
|
|
|
|
for(key in left.props) {
|
|
if(hasProp.call(left.props, key)) {
|
|
var progress = (frame - left.frame) / (right.frame - left.frame);
|
|
|
|
//Transform the current progress using the given easing function.
|
|
progress = left.props[key].easing(progress);
|
|
|
|
//Interpolate between the two values
|
|
value = _calcInterpolation(left.props[key].value, right.props[key].value, progress);
|
|
|
|
value = _interpolateString(value);
|
|
|
|
//Set style or attribute.
|
|
if(key.indexOf('@') === 0) {
|
|
element.setAttribute(key.substr(1), value);
|
|
} else {
|
|
skrollr.setStyle(element, key, value);
|
|
}
|
|
}
|
|
}
|
|
|
|
//Are events enabled on this element?
|
|
//This code handles the usual cases of scrolling through different keyframes.
|
|
//The special cases of before first and after last keyframe are handled above.
|
|
if(emitEvents) {
|
|
//Did we pass a new keyframe?
|
|
if(lastFrameIndex !== keyFrameIndex) {
|
|
if(_direction === 'down') {
|
|
_emitEvent(element, left.eventType, _direction);
|
|
} else {
|
|
_emitEvent(element, right.eventType, _direction);
|
|
}
|
|
|
|
skrollable.lastFrameIndex = keyFrameIndex;
|
|
}
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Renders all elements.
|
|
*/
|
|
var _render = function() {
|
|
if(_requestReflow) {
|
|
_requestReflow = false;
|
|
_reflow();
|
|
}
|
|
|
|
//We may render something else than the actual scrollbar position.
|
|
var renderTop = _instance.getScrollTop();
|
|
|
|
//If there's an animation, which ends in current render call, call the callback after rendering.
|
|
var afterAnimationCallback;
|
|
var now = _now();
|
|
var progress;
|
|
|
|
//Before actually rendering handle the scroll animation, if any.
|
|
if(_scrollAnimation) {
|
|
//It's over
|
|
if(now >= _scrollAnimation.endTime) {
|
|
renderTop = _scrollAnimation.targetTop;
|
|
afterAnimationCallback = _scrollAnimation.done;
|
|
_scrollAnimation = undefined;
|
|
} else {
|
|
//Map the current progress to the new progress using given easing function.
|
|
progress = _scrollAnimation.easing((now - _scrollAnimation.startTime) / _scrollAnimation.duration);
|
|
|
|
renderTop = (_scrollAnimation.startTop + progress * _scrollAnimation.topDiff) | 0;
|
|
}
|
|
|
|
_instance.setScrollTop(renderTop, true);
|
|
}
|
|
//Smooth scrolling only if there's no animation running and if we're not forcing the rendering.
|
|
else if(!_forceRender) {
|
|
var smoothScrollingDiff = _smoothScrolling.targetTop - renderTop;
|
|
|
|
//The user scrolled, start new smooth scrolling.
|
|
if(smoothScrollingDiff) {
|
|
_smoothScrolling = {
|
|
startTop: _lastTop,
|
|
topDiff: renderTop - _lastTop,
|
|
targetTop: renderTop,
|
|
startTime: _lastRenderCall,
|
|
endTime: _lastRenderCall + _smoothScrollingDuration
|
|
};
|
|
}
|
|
|
|
//Interpolate the internal scroll position (not the actual scrollbar).
|
|
if(now <= _smoothScrolling.endTime) {
|
|
//Map the current progress to the new progress using easing function.
|
|
progress = easings.sqrt((now - _smoothScrolling.startTime) / _smoothScrollingDuration);
|
|
|
|
renderTop = (_smoothScrolling.startTop + progress * _smoothScrolling.topDiff) | 0;
|
|
}
|
|
}
|
|
|
|
//That's were we actually "scroll" on mobile.
|
|
if(_isMobile && _skrollrBody) {
|
|
//Set the transform ("scroll it").
|
|
skrollr.setStyle(_skrollrBody, 'transform', 'translate(0, ' + -(_mobileOffset) + 'px) ' + _translateZ);
|
|
}
|
|
|
|
//Did the scroll position even change?
|
|
if(_forceRender || _lastTop !== renderTop) {
|
|
//Remember in which direction are we scrolling?
|
|
_direction = (renderTop > _lastTop) ? 'down' : (renderTop < _lastTop ? 'up' : _direction);
|
|
|
|
_forceRender = false;
|
|
|
|
var listenerParams = {
|
|
curTop: renderTop,
|
|
lastTop: _lastTop,
|
|
maxTop: _maxKeyFrame,
|
|
direction: _direction
|
|
};
|
|
|
|
//Tell the listener we are about to render.
|
|
var continueRendering = _listeners.beforerender && _listeners.beforerender.call(_instance, listenerParams);
|
|
|
|
//The beforerender listener function is able the cancel rendering.
|
|
if(continueRendering !== false) {
|
|
//Now actually interpolate all the styles.
|
|
_calcSteps(renderTop, _instance.getScrollTop());
|
|
|
|
//Remember when we last rendered.
|
|
_lastTop = renderTop;
|
|
|
|
if(_listeners.render) {
|
|
_listeners.render.call(_instance, listenerParams);
|
|
}
|
|
}
|
|
|
|
if(afterAnimationCallback) {
|
|
afterAnimationCallback.call(_instance, false);
|
|
}
|
|
}
|
|
|
|
_lastRenderCall = now;
|
|
};
|
|
|
|
/**
|
|
* Parses the properties for each key frame of the given skrollable.
|
|
*/
|
|
var _parseProps = function(skrollable) {
|
|
//Iterate over all key frames
|
|
var keyFrameIndex = 0;
|
|
var keyFramesLength = skrollable.keyFrames.length;
|
|
|
|
for(; keyFrameIndex < keyFramesLength; keyFrameIndex++) {
|
|
var frame = skrollable.keyFrames[keyFrameIndex];
|
|
var easing;
|
|
var value;
|
|
var prop;
|
|
var props = {};
|
|
|
|
var match;
|
|
|
|
while((match = rxPropValue.exec(frame.props)) !== null) {
|
|
prop = match[1];
|
|
value = match[2];
|
|
|
|
easing = prop.match(rxPropEasing);
|
|
|
|
//Is there an easing specified for this prop?
|
|
if(easing !== null) {
|
|
prop = easing[1];
|
|
easing = easing[2];
|
|
} else {
|
|
easing = DEFAULT_EASING;
|
|
}
|
|
|
|
//Exclamation point at first position forces the value to be taken literal.
|
|
value = value.indexOf('!') ? _parseProp(value) : [value.slice(1)];
|
|
|
|
//Save the prop for this key frame with his value and easing function
|
|
props[prop] = {
|
|
value: value,
|
|
easing: easings[easing]
|
|
};
|
|
}
|
|
|
|
frame.props = props;
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Parses a value extracting numeric values and generating a format string
|
|
* for later interpolation of the new values in old string.
|
|
*
|
|
* @param val The CSS value to be parsed.
|
|
* @return Something like ["rgba(?%,?%, ?%,?)", 100, 50, 0, .7]
|
|
* where the first element is the format string later used
|
|
* and all following elements are the numeric value.
|
|
*/
|
|
var _parseProp = function(val) {
|
|
var numbers = [];
|
|
|
|
//One special case, where floats don't work.
|
|
//We replace all occurences of rgba colors
|
|
//which don't use percentage notation with the percentage notation.
|
|
rxRGBAIntegerColor.lastIndex = 0;
|
|
val = val.replace(rxRGBAIntegerColor, function(rgba) {
|
|
return rgba.replace(rxNumericValue, function(n) {
|
|
return n / 255 * 100 + '%';
|
|
});
|
|
});
|
|
|
|
//Handle prefixing of "gradient" values.
|
|
//For now only the prefixed value will be set. Unprefixed isn't supported anyway.
|
|
if(theDashedCSSPrefix) {
|
|
rxGradient.lastIndex = 0;
|
|
val = val.replace(rxGradient, function(s) {
|
|
return theDashedCSSPrefix + s;
|
|
});
|
|
}
|
|
|
|
//Now parse ANY number inside this string and create a format string.
|
|
val = val.replace(rxNumericValue, function(n) {
|
|
numbers.push(+n);
|
|
return '{?}';
|
|
});
|
|
|
|
//Add the formatstring as first value.
|
|
numbers.unshift(val);
|
|
|
|
return numbers;
|
|
};
|
|
|
|
/**
|
|
* Fills the key frames with missing left and right hand properties.
|
|
* If key frame 1 has property X and key frame 2 is missing X,
|
|
* but key frame 3 has X again, then we need to assign X to key frame 2 too.
|
|
*
|
|
* @param sk A skrollable.
|
|
*/
|
|
var _fillProps = function(sk) {
|
|
//Will collect the properties key frame by key frame
|
|
var propList = {};
|
|
var keyFrameIndex;
|
|
var keyFramesLength;
|
|
|
|
//Iterate over all key frames from left to right
|
|
keyFrameIndex = 0;
|
|
keyFramesLength = sk.keyFrames.length;
|
|
|
|
for(; keyFrameIndex < keyFramesLength; keyFrameIndex++) {
|
|
_fillPropForFrame(sk.keyFrames[keyFrameIndex], propList);
|
|
}
|
|
|
|
//Now do the same from right to fill the last gaps
|
|
|
|
propList = {};
|
|
|
|
//Iterate over all key frames from right to left
|
|
keyFrameIndex = sk.keyFrames.length - 1;
|
|
|
|
for(; keyFrameIndex >= 0; keyFrameIndex--) {
|
|
_fillPropForFrame(sk.keyFrames[keyFrameIndex], propList);
|
|
}
|
|
};
|
|
|
|
var _fillPropForFrame = function(frame, propList) {
|
|
var key;
|
|
|
|
//For each key frame iterate over all right hand properties and assign them,
|
|
//but only if the current key frame doesn't have the property by itself
|
|
for(key in propList) {
|
|
//The current frame misses this property, so assign it.
|
|
if(!hasProp.call(frame.props, key)) {
|
|
frame.props[key] = propList[key];
|
|
}
|
|
}
|
|
|
|
//Iterate over all props of the current frame and collect them
|
|
for(key in frame.props) {
|
|
propList[key] = frame.props[key];
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Calculates the new values for two given values array.
|
|
*/
|
|
var _calcInterpolation = function(val1, val2, progress) {
|
|
var valueIndex;
|
|
var val1Length = val1.length;
|
|
|
|
//They both need to have the same length
|
|
if(val1Length !== val2.length) {
|
|
throw 'Can\'t interpolate between "' + val1[0] + '" and "' + val2[0] + '"';
|
|
}
|
|
|
|
//Add the format string as first element.
|
|
var interpolated = [val1[0]];
|
|
|
|
valueIndex = 1;
|
|
|
|
for(; valueIndex < val1Length; valueIndex++) {
|
|
//That's the line where the two numbers are actually interpolated.
|
|
interpolated[valueIndex] = val1[valueIndex] + ((val2[valueIndex] - val1[valueIndex]) * progress);
|
|
}
|
|
|
|
return interpolated;
|
|
};
|
|
|
|
/**
|
|
* Interpolates the numeric values into the format string.
|
|
*/
|
|
var _interpolateString = function(val) {
|
|
var valueIndex = 1;
|
|
|
|
rxInterpolateString.lastIndex = 0;
|
|
|
|
return val[0].replace(rxInterpolateString, function() {
|
|
return val[valueIndex++];
|
|
});
|
|
};
|
|
|
|
/**
|
|
* Resets the class and style attribute to what it was before skrollr manipulated the element.
|
|
* Also remembers the values it had before reseting, in order to undo the reset.
|
|
*/
|
|
var _reset = function(elements, undo) {
|
|
//We accept a single element or an array of elements.
|
|
elements = [].concat(elements);
|
|
|
|
var skrollable;
|
|
var element;
|
|
var elementsIndex = 0;
|
|
var elementsLength = elements.length;
|
|
|
|
for(; elementsIndex < elementsLength; elementsIndex++) {
|
|
element = elements[elementsIndex];
|
|
skrollable = _skrollables[element[SKROLLABLE_ID_DOM_PROPERTY]];
|
|
|
|
//Couldn't find the skrollable for this DOM element.
|
|
if(!skrollable) {
|
|
continue;
|
|
}
|
|
|
|
if(undo) {
|
|
//Reset class and style to the "dirty" (set by skrollr) values.
|
|
element.style.cssText = skrollable.dirtyStyleAttr;
|
|
_updateClass(element, skrollable.dirtyClassAttr);
|
|
} else {
|
|
//Remember the "dirty" (set by skrollr) class and style.
|
|
skrollable.dirtyStyleAttr = element.style.cssText;
|
|
skrollable.dirtyClassAttr = _getClass(element);
|
|
|
|
//Reset class and style to what it originally was.
|
|
element.style.cssText = skrollable.styleAttr;
|
|
_updateClass(element, skrollable.classAttr);
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Detects support for 3d transforms by applying it to the skrollr-body.
|
|
*/
|
|
var _detect3DTransforms = function() {
|
|
_translateZ = 'translateZ(0)';
|
|
skrollr.setStyle(_skrollrBody, 'transform', _translateZ);
|
|
|
|
var computedStyle = getStyle(_skrollrBody);
|
|
var computedTransform = computedStyle.getPropertyValue('transform');
|
|
var computedTransformWithPrefix = computedStyle.getPropertyValue(theDashedCSSPrefix + 'transform');
|
|
var has3D = (computedTransform && computedTransform !== 'none') || (computedTransformWithPrefix && computedTransformWithPrefix !== 'none');
|
|
|
|
if(!has3D) {
|
|
_translateZ = '';
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Set the CSS property on the given element. Sets prefixed properties as well.
|
|
*/
|
|
skrollr.setStyle = function(el, prop, val) {
|
|
var style = el.style;
|
|
|
|
//Camel case.
|
|
prop = prop.replace(rxCamelCase, rxCamelCaseFn).replace('-', '');
|
|
|
|
//Make sure z-index gets a <integer>.
|
|
//This is the only <integer> case we need to handle.
|
|
if(prop === 'zIndex') {
|
|
if(isNaN(val)) {
|
|
//If it's not a number, don't touch it.
|
|
//It could for example be "auto" (#351).
|
|
style[prop] = val;
|
|
} else {
|
|
//Floor the number.
|
|
style[prop] = '' + (val | 0);
|
|
}
|
|
}
|
|
//#64: "float" can't be set across browsers. Needs to use "cssFloat" for all except IE.
|
|
else if(prop === 'float') {
|
|
style.styleFloat = style.cssFloat = val;
|
|
}
|
|
else {
|
|
//Need try-catch for old IE.
|
|
try {
|
|
//Set prefixed property if there's a prefix.
|
|
if(theCSSPrefix) {
|
|
style[theCSSPrefix + prop.slice(0,1).toUpperCase() + prop.slice(1)] = val;
|
|
}
|
|
|
|
//Set unprefixed.
|
|
style[prop] = val;
|
|
} catch(ignore) {}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Cross browser event handling.
|
|
*/
|
|
var _addEvent = skrollr.addEvent = function(element, names, callback) {
|
|
var intermediate = function(e) {
|
|
//Normalize IE event stuff.
|
|
e = e || window.event;
|
|
|
|
if(!e.target) {
|
|
e.target = e.srcElement;
|
|
}
|
|
|
|
if(!e.preventDefault) {
|
|
e.preventDefault = function() {
|
|
e.returnValue = false;
|
|
e.defaultPrevented = true;
|
|
};
|
|
}
|
|
|
|
return callback.call(this, e);
|
|
};
|
|
|
|
names = names.split(' ');
|
|
|
|
var name;
|
|
var nameCounter = 0;
|
|
var namesLength = names.length;
|
|
|
|
for(; nameCounter < namesLength; nameCounter++) {
|
|
name = names[nameCounter];
|
|
|
|
if(element.addEventListener) {
|
|
element.addEventListener(name, callback, false);
|
|
} else {
|
|
element.attachEvent('on' + name, intermediate);
|
|
}
|
|
|
|
//Remember the events to be able to flush them later.
|
|
_registeredEvents.push({
|
|
element: element,
|
|
name: name,
|
|
listener: callback
|
|
});
|
|
}
|
|
};
|
|
|
|
var _removeEvent = skrollr.removeEvent = function(element, names, callback) {
|
|
names = names.split(' ');
|
|
|
|
var nameCounter = 0;
|
|
var namesLength = names.length;
|
|
|
|
for(; nameCounter < namesLength; nameCounter++) {
|
|
if(element.removeEventListener) {
|
|
element.removeEventListener(names[nameCounter], callback, false);
|
|
} else {
|
|
element.detachEvent('on' + names[nameCounter], callback);
|
|
}
|
|
}
|
|
};
|
|
|
|
var _removeAllEvents = function() {
|
|
var eventData;
|
|
var eventCounter = 0;
|
|
var eventsLength = _registeredEvents.length;
|
|
|
|
for(; eventCounter < eventsLength; eventCounter++) {
|
|
eventData = _registeredEvents[eventCounter];
|
|
|
|
_removeEvent(eventData.element, eventData.name, eventData.listener);
|
|
}
|
|
|
|
_registeredEvents = [];
|
|
};
|
|
|
|
var _emitEvent = function(element, name, direction) {
|
|
if(_listeners.keyframe) {
|
|
_listeners.keyframe.call(_instance, element, name, direction);
|
|
}
|
|
};
|
|
|
|
var _reflow = function() {
|
|
var pos = _instance.getScrollTop();
|
|
|
|
//Will be recalculated by _updateDependentKeyFrames.
|
|
_maxKeyFrame = 0;
|
|
|
|
if(_forceHeight && !_isMobile) {
|
|
//un-"force" the height to not mess with the calculations in _updateDependentKeyFrames (#216).
|
|
body.style.height = '';
|
|
}
|
|
|
|
_updateDependentKeyFrames();
|
|
|
|
if(_forceHeight && !_isMobile) {
|
|
//"force" the height.
|
|
body.style.height = (_maxKeyFrame + documentElement.clientHeight) + 'px';
|
|
}
|
|
|
|
//The scroll offset may now be larger than needed (on desktop the browser/os prevents scrolling farther than the bottom).
|
|
if(_isMobile) {
|
|
_instance.setScrollTop(Math.min(_instance.getScrollTop(), _maxKeyFrame));
|
|
} else {
|
|
//Remember and reset the scroll pos (#217).
|
|
_instance.setScrollTop(pos, true);
|
|
}
|
|
|
|
_forceRender = true;
|
|
};
|
|
|
|
/*
|
|
* Returns a copy of the constants object where all functions and strings have been evaluated.
|
|
*/
|
|
var _processConstants = function() {
|
|
var viewportHeight = documentElement.clientHeight;
|
|
var copy = {};
|
|
var prop;
|
|
var value;
|
|
|
|
for(prop in _constants) {
|
|
value = _constants[prop];
|
|
|
|
if(typeof value === 'function') {
|
|
value = value.call(_instance);
|
|
}
|
|
//Percentage offset.
|
|
else if((/p$/).test(value)) {
|
|
value = (value.slice(0, -1) / 100) * viewportHeight;
|
|
}
|
|
|
|
copy[prop] = value;
|
|
}
|
|
|
|
return copy;
|
|
};
|
|
|
|
/*
|
|
* Returns the height of the document.
|
|
*/
|
|
var _getDocumentHeight = function() {
|
|
var skrollrBodyHeight = (_skrollrBody && _skrollrBody.offsetHeight || 0);
|
|
var bodyHeight = Math.max(skrollrBodyHeight, body.scrollHeight, body.offsetHeight, documentElement.scrollHeight, documentElement.offsetHeight, documentElement.clientHeight);
|
|
|
|
return bodyHeight - documentElement.clientHeight;
|
|
};
|
|
|
|
/**
|
|
* Returns a string of space separated classnames for the current element.
|
|
* Works with SVG as well.
|
|
*/
|
|
var _getClass = function(element) {
|
|
var prop = 'className';
|
|
|
|
//SVG support by using className.baseVal instead of just className.
|
|
if(window.SVGElement && element instanceof window.SVGElement) {
|
|
element = element[prop];
|
|
prop = 'baseVal';
|
|
}
|
|
|
|
return element[prop];
|
|
};
|
|
|
|
/**
|
|
* Adds and removes a CSS classes.
|
|
* Works with SVG as well.
|
|
* add and remove are arrays of strings,
|
|
* or if remove is ommited add is a string and overwrites all classes.
|
|
*/
|
|
var _updateClass = function(element, add, remove) {
|
|
var prop = 'className';
|
|
|
|
//SVG support by using className.baseVal instead of just className.
|
|
if(window.SVGElement && element instanceof window.SVGElement) {
|
|
element = element[prop];
|
|
prop = 'baseVal';
|
|
}
|
|
|
|
//When remove is ommited, we want to overwrite/set the classes.
|
|
if(remove === undefined) {
|
|
element[prop] = add;
|
|
return;
|
|
}
|
|
|
|
//Cache current classes. We will work on a string before passing back to DOM.
|
|
var val = element[prop];
|
|
|
|
//All classes to be removed.
|
|
var classRemoveIndex = 0;
|
|
var removeLength = remove.length;
|
|
|
|
for(; classRemoveIndex < removeLength; classRemoveIndex++) {
|
|
val = _untrim(val).replace(_untrim(remove[classRemoveIndex]), ' ');
|
|
}
|
|
|
|
val = _trim(val);
|
|
|
|
//All classes to be added.
|
|
var classAddIndex = 0;
|
|
var addLength = add.length;
|
|
|
|
for(; classAddIndex < addLength; classAddIndex++) {
|
|
//Only add if el not already has class.
|
|
if(_untrim(val).indexOf(_untrim(add[classAddIndex])) === -1) {
|
|
val += ' ' + add[classAddIndex];
|
|
}
|
|
}
|
|
|
|
element[prop] = _trim(val);
|
|
};
|
|
|
|
var _trim = function(a) {
|
|
return a.replace(rxTrim, '');
|
|
};
|
|
|
|
/**
|
|
* Adds a space before and after the string.
|
|
*/
|
|
var _untrim = function(a) {
|
|
return ' ' + a + ' ';
|
|
};
|
|
|
|
var _now = Date.now || function() {
|
|
return +new Date();
|
|
};
|
|
|
|
var _keyFrameComparator = function(a, b) {
|
|
return a.frame - b.frame;
|
|
};
|
|
|
|
/*
|
|
* Private variables.
|
|
*/
|
|
|
|
//Singleton
|
|
var _instance;
|
|
|
|
/*
|
|
A list of all elements which should be animated associated with their the metadata.
|
|
Exmaple skrollable with two key frames animating from 100px width to 20px:
|
|
|
|
skrollable = {
|
|
element: <the DOM element>,
|
|
styleAttr: <style attribute of the element before skrollr>,
|
|
classAttr: <class attribute of the element before skrollr>,
|
|
keyFrames: [
|
|
{
|
|
frame: 100,
|
|
props: {
|
|
width: {
|
|
value: ['{?}px', 100],
|
|
easing: <reference to easing function>
|
|
}
|
|
},
|
|
mode: "absolute"
|
|
},
|
|
{
|
|
frame: 200,
|
|
props: {
|
|
width: {
|
|
value: ['{?}px', 20],
|
|
easing: <reference to easing function>
|
|
}
|
|
},
|
|
mode: "absolute"
|
|
}
|
|
]
|
|
};
|
|
*/
|
|
var _skrollables;
|
|
|
|
var _skrollrBody;
|
|
|
|
var _listeners;
|
|
var _forceHeight;
|
|
var _maxKeyFrame = 0;
|
|
|
|
var _scale = 1;
|
|
var _constants;
|
|
|
|
var _mobileDeceleration;
|
|
|
|
//Current direction (up/down).
|
|
var _direction = 'down';
|
|
|
|
//The last top offset value. Needed to determine direction.
|
|
var _lastTop = -1;
|
|
|
|
//The last time we called the render method (doesn't mean we rendered!).
|
|
var _lastRenderCall = _now();
|
|
|
|
//For detecting if it actually resized (#271).
|
|
var _lastViewportWidth = 0;
|
|
var _lastViewportHeight = 0;
|
|
|
|
var _requestReflow = false;
|
|
|
|
//Will contain data about a running scrollbar animation, if any.
|
|
var _scrollAnimation;
|
|
|
|
var _smoothScrollingEnabled;
|
|
|
|
var _smoothScrollingDuration;
|
|
|
|
//Will contain settins for smooth scrolling if enabled.
|
|
var _smoothScrolling;
|
|
|
|
//Can be set by any operation/event to force rendering even if the scrollbar didn't move.
|
|
var _forceRender;
|
|
|
|
//Each skrollable gets an unique ID incremented for each skrollable.
|
|
//The ID is the index in the _skrollables array.
|
|
var _skrollableIdCounter = 0;
|
|
|
|
var _edgeStrategy;
|
|
|
|
|
|
//Mobile specific vars. Will be stripped by UglifyJS when not in use.
|
|
var _isMobile = false;
|
|
|
|
//The virtual scroll offset when using mobile scrolling.
|
|
var _mobileOffset = 0;
|
|
|
|
//If the browser supports 3d transforms, this will be filled with 'translateZ(0)' (empty string otherwise).
|
|
var _translateZ;
|
|
|
|
//Will contain data about registered events by skrollr.
|
|
var _registeredEvents = [];
|
|
|
|
//Animation frame id returned by RequestAnimationFrame (or timeout when RAF is not supported).
|
|
var _animFrame;
|
|
|
|
//Expose skrollr as either a global variable or a require.js module
|
|
if(typeof define === 'function' && define.amd) {
|
|
define('skrollr', function () {
|
|
return skrollr;
|
|
});
|
|
} else if (typeof module !== 'undefined' && module.exports) {
|
|
module.exports = skrollr;
|
|
} else {
|
|
window.skrollr = skrollr;
|
|
}
|
|
|
|
}(window, document));
|