519 lines
17 KiB
JavaScript
519 lines
17 KiB
JavaScript
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/*
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scrollorama - The jQuery plugin for doing cool scrolly stuff
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by John Polacek (@johnpolacek)
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Dual licensed under MIT and GPL.
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*/
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(function($) {
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$.scrollorama = function(options) {
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var scrollorama = this,
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blocks = [],
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browserPrefix = '',
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onBlockChange = function() {},
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latestKnownScrollY = 0,
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ticking = false,
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requestAnimFrame = window.requestAnimationFrame ||
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window.webkitRequestAnimationFrame ||
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window.mozRequestAnimationFrame ||
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window.oRequestAnimationFrame ||
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window.msRequestAnimationFrame ||
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function( callback ){
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window.setTimeout(callback, 1000 / 60);
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},
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defaults = {offset:0, enablePin: true};
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scrollorama.settings = $.extend({}, defaults, options);
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scrollorama.blockIndex = 0;
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if (options.blocks === undefined) { alert('ERROR: Must assign blocks class selector to scrollorama plugin'); }
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// PRIVATE FUNCTIONS
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function init() {
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var i, block, didScroll, marginTop = false;
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if (typeof scrollorama.settings.blocks === 'string') { scrollorama.settings.blocks = $(scrollorama.settings.blocks); }
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// set browser prefix
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if ($.browser.mozilla) { browserPrefix = '-moz-'; }
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if ($.browser.webkit) { browserPrefix = '-webkit-'; }
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if ($.browser.opera) { browserPrefix = '-o-'; }
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if ($.browser.msie) { browserPrefix = '-ms-'; }
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// create blocks array to contain animation props
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$('body').css('position','relative');
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for (i=0; i<scrollorama.settings.blocks.length; i++) {
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block = scrollorama.settings.blocks.eq(i);
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marginTop = block.css('margin-top');
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blocks.push({
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block: block,
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top: block.offset().top - (!Boolean(marginTop) ? parseInt(marginTop, 10) : 0),
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pin: 0,
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animations:[]
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});
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}
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// convert block elements to absolute position
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if (scrollorama.settings.enablePin.toString() === 'true') {
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for (i=0; i<blocks.length; i++) {
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blocks[i].block
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.css('position', 'absolute')
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.css('top', blocks[i].top);
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}
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}
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$('body').prepend('<div id="scroll-wrap"></div>');
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latestKnownScrollY = 0;
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ticking = false;
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$(window).on( 'scroll.scrollorama', onScroll );
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}
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function onScroll() {
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latestKnownScrollY = window.scrollY;
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requestTick();
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}
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function requestTick() {
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if(!ticking) {
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requestAnimFrame(function(){
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onScrollorama();
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update();
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});
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}
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ticking = true;
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}
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function update() {
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// reset the tick so we can
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// capture the next onScroll
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ticking = false;
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}
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function onScrollorama() {
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var scrollTop = $(window).scrollTop(),
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currBlockIndex = getCurrBlockIndex(scrollTop),
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i, j, anim, startAnimPos, endAnimPos, animPercent, animVal;
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// update all animations
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for (i=0; i<blocks.length; i++) {
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// go through the animations for each block
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if (blocks[i].animations.length) {
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for (j=0; j<blocks[i].animations.length; j++) {
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anim = blocks[i].animations[j];
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// if above current block, settings should be at start value
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if (i > currBlockIndex) {
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if (currBlockIndex !== i-1 && anim.baseline !== 'bottom') {
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setProperty(anim.element, anim.property, anim.startVal);
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}
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if (blocks[i].pin) {
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blocks[i].block
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.css('position', 'absolute')
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.css('top', blocks[i].top);
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}
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}
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// if below current block, settings should be at end value
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// unless on an element that gets animated when it hits the bottom of the viewport
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else if (i < currBlockIndex) {
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setProperty(anim.element, anim.property, anim.endVal);
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if (blocks[i].pin) {
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blocks[i].block
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.css('position', 'absolute')
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.css('top', (blocks[i].top + blocks[i].pin));
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}
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}
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// otherwise, set values per scroll position
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if (i === currBlockIndex || (currBlockIndex === i-1 && anim.baseline === 'bottom')) {
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// if block gets pinned, set position fixed
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if (blocks[i].pin && currBlockIndex === i) {
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blocks[i].block
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.css('position', 'fixed')
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.css('top', 0);
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}
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// set start and end animation positions
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startAnimPos = blocks[i].top + anim.delay;
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if (anim.baseline === 'bottom') { startAnimPos -= $(window).height(); }
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endAnimPos = startAnimPos + anim.duration;
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// if scroll is before start of animation, set to start value
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if (scrollTop < startAnimPos) {
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setProperty(anim.element, anim.property, anim.startVal);
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}
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// if scroll is after end of animation, set to end value
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else if (scrollTop > endAnimPos) {
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setProperty(anim.element, anim.property, anim.endVal);
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if (blocks[i].pin) {
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blocks[i].block
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.css('position', 'absolute')
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.css('top', (blocks[i].top + blocks[i].pin));
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}
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}
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// otherwise, set value based on scroll
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else {
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// calculate percent to animate
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animPercent = (scrollTop - startAnimPos) / anim.duration;
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// account for easing if there is any
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if ( anim.easing && $.isFunction( $.easing[anim.easing] ) ) {
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animPercent = $.easing[anim.easing]( animPercent, animPercent*1000, 0, 1, 1000 );
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}
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// then multiply the percent by the value range and calculate the new value
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animVal = anim.startVal + (animPercent * (anim.endVal - anim.startVal));
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setProperty(anim.element, anim.property, animVal);
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}
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}
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}
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}
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}
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// update blockIndex and trigger event if changed
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if (scrollorama.blockIndex !== currBlockIndex) {
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scrollorama.blockIndex = currBlockIndex;
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onBlockChange();
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}
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}
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function getCurrBlockIndex(scrollTop) {
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var currBlockIndex = 0, i;
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for (i=0; i<blocks.length; i++) {
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// check if block is in view
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if (blocks[i].top <= scrollTop - scrollorama.settings.offset) { currBlockIndex = i; }
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}
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return currBlockIndex;
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}
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function setProperty(target, prop, val) {
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var scaleCSS, currentPosition;
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if (prop === 'rotate' || prop === 'zoom' || prop === 'scale') {
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if (prop === 'rotate') {
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target.css(browserPrefix+'transform', 'rotate('+val+'deg)');
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} else if (prop === 'zoom' || prop === 'scale') {
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scaleCSS = 'scale('+val+')';
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if (browserPrefix !== '-ms-') {
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target.css(browserPrefix+'transform', scaleCSS);
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} else {
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target.css('zoom', scaleCSS);
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}
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}
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}
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else if(prop === 'background-position-x' || prop === 'background-position-y' ) {
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currentPosition = target.css('background-position').split(' ');
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if(prop === 'background-position-x') {
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target.css('background-position',val+'px '+currentPosition[1]);
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}
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if(prop === 'background-position-y') {
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target.css('background-position', currentPosition[0]+' '+val+'px');
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}
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}
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else if(prop === 'text-shadow' ) {
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target.css(prop,'0px 0px '+val+'px #ffffff');
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} else {
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target.css(prop, val);
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}
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}
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// PUBLIC FUNCTIONS
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scrollorama.animate = function(target) {
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var targetIndex,
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targetBlock,
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anim,
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offset,
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i, j;
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/*
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target = animation target
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arguments = array of animation parameters
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anim = object that contains all animation params (created from arguments)
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offset = positioning helper for pinning
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animation parameters:
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delay = amount of scrolling (in pixels) before animation starts
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duration = amount of scrolling (in pixels) over which the animation occurs
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property = css property being animated
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start = start value of the property
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end = end value of the property
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pin = pin block during animation duration (applies to all animations within block)
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baseline = top (default, when block reaches top of viewport) or bottom (when block first comies into view)
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easing = just like jquery's easing functions
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*/
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// if string, convert to DOM object
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if (typeof target === 'string') { target = $(target); }
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// find block of target
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for (i=0; i<blocks.length; i++) {
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if (blocks[i].block.has(target).length) {
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targetBlock = blocks[i];
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targetIndex = i;
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}
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}
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// add each animation to the blocks animations array from function arguments
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for (i=1; i<arguments.length; i++) {
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anim = arguments[i];
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// for top/left/right/bottom, set relative positioning if static
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if (anim.property === 'top' || anim.property === 'left' || anim.property === 'bottom' || anim.property === 'right' ) {
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if (target.css('position') === 'static') { target.css('position','relative'); }
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// set anim.start, anim.end defaults
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cssValue = parseInt(target.css(anim.property),10);
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if (anim.start === undefined) {
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anim.start = isNaN(cssValue) ? 0 : cssValue;
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} else if (anim.end === undefined) {
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anim.end = isNaN(cssValue) ? 0 : cssValue;
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}
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}
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// set anim.start/anim.end defaults for rotate, zoom/scale, letter-spacing
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if (anim.property === 'rotate') {
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if (anim.start === undefined) { anim.start = 0; }
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if (anim.end === undefined) { anim.end = 0; }
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} else if (anim.property === 'zoom' || anim.property === 'scale' ) {
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if (anim.start === undefined) { anim.start = 1; }
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if (anim.end === undefined) { anim.end = 1; }
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} else if (anim.property === 'letter-spacing' && target.css(anim.property)) {
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if (anim.start === undefined) { anim.start = 1; }
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if (anim.end === undefined) { anim.end = 1; }
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}
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if (anim.baseline === undefined) {
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if (anim.pin || targetBlock.pin || targetIndex === 0) {
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anim.baseline = 'top';
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} else {
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anim.baseline = 'bottom';
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}
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}
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if (anim.delay === undefined) { anim.delay = 0; }
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targetBlock.animations.push({
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element: target,
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delay: anim.delay,
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duration: anim.duration,
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property: anim.property,
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startVal: anim.start !== undefined ? anim.start : parseInt(target.css(anim.property),10), // if undefined, use current css value
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endVal: anim.end !== undefined ? anim.end : parseInt(target.css(anim.property),10), // if undefined, use current css value
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baseline: anim.baseline !== undefined ? anim.baseline : 'bottom',
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easing: anim.easing
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});
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if (anim.pin) {
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if (targetBlock.pin < anim.duration + anim.delay) {
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offset = anim.duration + anim.delay - targetBlock.pin;
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targetBlock.pin += offset;
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// adjust positions of blocks below target block
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for (j=targetIndex+1; j<blocks.length; j++) {
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blocks[j].top += offset;
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blocks[j].block.css('top', blocks[j].top);
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}
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}
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}
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}
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onScrollorama();
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};
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// function for passing blockChange event callback
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scrollorama.onBlockChange = function(f) {
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onBlockChange = f;
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};
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// function for getting an array of scrollpoints
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// (top of each animation block and animation element scroll start point)
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scrollorama.getScrollpoints = function() {
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var scrollpoints = [],i,j,anim;
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for (i=0; i<blocks.length; i++) {
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scrollpoints.push(blocks[i].top);
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// go through the animations for each block
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if (blocks[i].animations.length && blocks[i].pin > 0) {
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for (j=0; j<blocks[i].animations.length; j++) {
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anim = blocks[i].animations[j];
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scrollpoints.push(blocks[i].top + anim.delay + anim.duration);
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}
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}
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}
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// make sure scrollpoints are in numeric order
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scrollpoints.sort(function(a,b) {return a - b;});
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return scrollpoints;
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};
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// Remove scrollorama
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scrollorama.destroy = function () {
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// Remove animations
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for (i=0; i<blocks.length; i++) {
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// Remove CSS rules
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blocks[i].block.css({
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top: '',
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position: ''
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});
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// Remove scrolloroma-specific attributes
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delete blocks[i].animations;
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delete blocks[i].top;
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delete blocks[i].pin;
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}
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// Unbind the window scroll event
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$(window).off('scroll.scrollorama');
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$('#scroll-wrap').remove();
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// Remove the scrolloroma object
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delete scrollorama;
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};
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// INIT
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init();
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return scrollorama;
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};
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//
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// Easing functions from jQuery UI
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//
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$.extend($.easing, {
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def: 'easeOutQuad',
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swing: function (x, t, b, c, d) {
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//alert($.easing.default);
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return $.easing[$.easing.def](x, t, b, c, d);
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},
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easeInQuad: function (x, t, b, c, d) {
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return c*(t/=d)*t + b;
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},
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easeOutQuad: function (x, t, b, c, d) {
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return -c *(t/=d)*(t-2) + b;
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},
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easeInOutQuad: function (x, t, b, c, d) {
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if ((t/=d/2) < 1) { return c/2*t*t + b; }
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return -c/2 * ((--t)*(t-2) - 1) + b;
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},
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easeInCubic: function (x, t, b, c, d) {
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return c*(t/=d)*t*t + b;
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},
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easeOutCubic: function (x, t, b, c, d) {
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return c*((t=t/d-1)*t*t + 1) + b;
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},
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easeInOutCubic: function (x, t, b, c, d) {
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if ((t/=d/2) < 1) { return c/2*t*t*t + b; }
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return c/2*((t-=2)*t*t + 2) + b;
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},
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easeInQuart: function (x, t, b, c, d) {
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return c*(t/=d)*t*t*t + b;
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},
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easeOutQuart: function (x, t, b, c, d) {
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return -c * ((t=t/d-1)*t*t*t - 1) + b;
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},
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easeInOutQuart: function (x, t, b, c, d) {
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if ((t/=d/2) < 1) { return c/2*t*t*t*t + b; }
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return -c/2 * ((t-=2)*t*t*t - 2) + b;
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},
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easeInQuint: function (x, t, b, c, d) {
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return c*(t/=d)*t*t*t*t + b;
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},
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easeOutQuint: function (x, t, b, c, d) {
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return c*((t=t/d-1)*t*t*t*t + 1) + b;
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},
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easeInOutQuint: function (x, t, b, c, d) {
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if ((t/=d/2) < 1) { return c/2*t*t*t*t*t + b; }
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return c/2*((t-=2)*t*t*t*t + 2) + b;
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},
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easeInSine: function (x, t, b, c, d) {
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return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
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},
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easeOutSine: function (x, t, b, c, d) {
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return c * Math.sin(t/d * (Math.PI/2)) + b;
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},
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easeInOutSine: function (x, t, b, c, d) {
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return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
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},
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easeInExpo: function (x, t, b, c, d) {
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return (t===0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
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},
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easeOutExpo: function (x, t, b, c, d) {
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return (t===d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
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},
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easeInOutExpo: function (x, t, b, c, d) {
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if (t===0) { return b; }
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if (t===d) { return b+c; }
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if ((t/=d/2) < 1) { return c/2 * Math.pow(2, 10 * (t - 1)) + b; }
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return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
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},
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easeInCirc: function (x, t, b, c, d) {
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return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
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},
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easeOutCirc: function (x, t, b, c, d) {
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return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
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},
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easeInOutCirc: function (x, t, b, c, d) {
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if ((t/=d/2) < 1) { return -c/2 * (Math.sqrt(1 - t*t) - 1) + b; }
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return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
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},
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easeInElastic: function (x, t, b, c, d) {
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var s=1.70158,p=0,a=c;
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if (t===0) { return b; }
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if ((t/=d)===1) { return b+c; }
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if (!p) { p=d*0.3; }
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if (a < Math.abs(c)) { a=c; s=p/4; }
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else{ s = p/(2*Math.PI) * Math.asin (c/a); }
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return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
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},
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easeOutElastic: function (x, t, b, c, d) {
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var s=1.70158,p=0,a=c;
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if (t===0) { return b; }
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if ((t/=d)===1) { return b+c; }
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if (!p) { p=d*0.3; }
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if (a < Math.abs(c)) { a=c; s=p/4; }
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else { s = p/(2*Math.PI) * Math.asin (c/a); }
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return a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b;
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},
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easeInOutElastic: function (x, t, b, c, d) {
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var s=1.70158,p=0,a=c;
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if (t===0) { return b; }
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if ((t/=d/2)===2) { return b+c; }
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if (!p) { p=d*(0.3*1.5); }
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if (a < Math.abs(c)) { a=c; s=p/4; }
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else { s = p/(2*Math.PI) * Math.asin (c/a); }
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if (t < 1) { return -0.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b; }
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return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*0.5 + c + b;
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},
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easeInBack: function (x, t, b, c, d, s) {
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if (s === undefined) { s = 1.70158; }
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return c*(t/=d)*t*((s+1)*t - s) + b;
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},
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easeOutBack: function (x, t, b, c, d, s) {
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if (s === undefined) { s = 1.70158; }
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return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
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},
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easeInOutBack: function (x, t, b, c, d, s) {
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if (s === undefined) { s = 1.70158; }
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if ((t/=d/2) < 1) { return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b; }
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return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
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},
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easeInBounce: function (x, t, b, c, d) {
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return c - $.easing.easeOutBounce (x, d-t, 0, c, d) + b;
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},
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easeOutBounce: function (x, t, b, c, d) {
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if ((t/=d) < (1/2.75)) {
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return c*(7.5625*t*t) + b;
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} else if (t < (2/2.75)) {
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return c*(7.5625*(t-=(1.5/2.75))*t + 0.75) + b;
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} else if (t < (2.5/2.75)) {
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return c*(7.5625*(t-=(2.25/2.75))*t + 0.9375) + b;
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} else {
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return c*(7.5625*(t-=(2.625/2.75))*t + 0.984375) + b;
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}
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},
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easeInOutBounce: function (x, t, b, c, d) {
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if (t < d/2) { return $.easing.easeInBounce (x, t*2, 0, c, d) * 0.5 + b; }
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return $.easing.easeOutBounce (x, t*2-d, 0, c, d) * 0.5 + c*0.5 + b;
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}
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});
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})(jQuery);
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