Smooth scroll - hardware mouse

/* Plugin Name: BrowserSelector Written by: Crivos - (http://www.crivos.com) Version: 0.1 */ (function($) { $.extend({ browserSelector: function() { var u = navigator.userAgent, ua = u.toLowerCase(), is = function (t) { return ua.indexOf(t) > -1; }, g = 'gecko', w = 'webkit', s = 'safari', o = 'opera', h = document.documentElement, b = [(!(/opera|webtv/i.test(ua)) && /msie\s(\d)/.test(ua)) ? ('ie ie' + parseFloat(navigator.appVersion.split("MSIE")[1])) : is('firefox/2') ? g + ' ff2' : is('firefox/3.5') ? g + ' ff3 ff3_5' : is('firefox/3') ? g + ' ff3' : is('gecko/') ? g : is('opera') ? o + (/version\/(\d+)/.test(ua) ? ' ' + o + RegExp.jQuery1 : (/opera(\s|\/)(\d+)/.test(ua) ? ' ' + o + RegExp.jQuery2 : '')) : is('konqueror') ? 'konqueror' : is('chrome') ? w + ' chrome' : is('iron') ? w + ' iron' : is('applewebkit/') ? w + ' ' + s + (/version\/(\d+)/.test(ua) ? ' ' + s + RegExp.jQuery1 : '') : is('mozilla/') ? g : '', is('j2me') ? 'mobile' : is('iphone') ? 'iphone' : is('ipod') ? 'ipod' : is('mac') ? 'mac' : is('darwin') ? 'mac' : is('webtv') ? 'webtv' : is('win') ? 'win' : is('freebsd') ? 'freebsd' : (is('x11') || is('linux')) ? 'linux' : '', 'js']; c = b.join(' '); h.className += ' ' + c; } }); })(jQuery); /* Plugin Name: smoothScroll for jQuery. Written by: Crivos - (http://www.crivos.com) Version: 0.1 Based on: SmoothScroll v1.2.1 Licensed under the terms of the MIT license. People involved - Balazs Galambosi (maintainer) - Patrick Brunner (original idea) - Michael Herf (Pulse Algorithm) */ (function($) { $.extend({ smoothScroll: function() { // Scroll Variables (tweakable) var defaultOptions = { // Scrolling Core frameRate : 150, // [Hz] animationTime : 700, // [px] stepSize : 80, // [px] // Pulse (less tweakable) // ratio of "tail" to "acceleration" pulseAlgorithm : true, pulseScale : 8, pulseNormalize : 1, // Acceleration accelerationDelta : 20, // 20 accelerationMax : 1, // 1 // Keyboard Settings keyboardSupport : true, // option arrowScroll : 50, // [px] // Other touchpadSupport : true, fixedBackground : true, excluded : "" }; var options = defaultOptions; // Other Variables var isExcluded = false; var isFrame = false; var direction = { x: 0, y: 0 }; var initDone = false; var root = document.documentElement; var activeElement; var observer; var deltaBuffer = [ 120, 120, 120 ]; var key = { left: 37, up: 38, right: 39, down: 40, spacebar: 32, pageup: 33, pagedown: 34, end: 35, home: 36 }; /*********************************************** * INITIALIZE ***********************************************/ /** * Tests if smooth scrolling is allowed. Shuts down everything if not. */ function initTest() { var disableKeyboard = false; // disable keys for google reader (spacebar conflict) if (document.URL.indexOf("google.com/reader/view") > -1) { disableKeyboard = true; } // disable everything if the page is blacklisted if (options.excluded) { var domains = options.excluded.split(/[,\n] ?/); domains.push("mail.google.com"); // exclude Gmail for now for (var i = domains.length; i--;) { if (document.URL.indexOf(domains[i]) > -1) { observer && observer.disconnect(); removeEvent("mousewheel", wheel); disableKeyboard = true; isExcluded = true; break; } } } // disable keyboard support if anything above requested it if (disableKeyboard) { removeEvent("keydown", keydown); } if (options.keyboardSupport && !disableKeyboard) { addEvent("keydown", keydown); } } /** * Sets up scrolls array, determines if frames are involved. */ function init() { if (!document.body) return; var body = document.body; var html = document.documentElement; var windowHeight = window.innerHeight; var scrollHeight = body.scrollHeight; // check compat mode for root element root = (document.compatMode.indexOf('CSS') >= 0) ? html : body; activeElement = body; initTest(); initDone = true; // Checks if this script is running in a frame if (top != self) { isFrame = true; } /** * This fixes a bug where the areas left and right to * the content does not trigger the onmousewheel event * on some pages. e.g.: html, body { height: 100% } */ else if (scrollHeight > windowHeight && (body.offsetHeight <= windowHeight || html.offsetHeight <= windowHeight)) { // DOMChange (throttle): fix height var pending = false; var refresh = function () { if (!pending && html.scrollHeight != document.height) { pending = true; // add a new pending action setTimeout(function () { html.style.height = document.height + 'px'; pending = false; }, 500); // act rarely to stay fast } }; html.style.height = 'auto'; setTimeout(refresh, 10); var config = { attributes: true, childList: true, characterData: false }; observer = new MutationObserver(refresh); observer.observe(body, config); // clearfix if (root.offsetHeight <= windowHeight) { var underlay = document.createElement("div"); underlay.style.clear = "both"; body.appendChild(underlay); } } // gmail performance fix if (document.URL.indexOf("mail.google.com") > -1) { var s = document.createElement("style"); s.innerHTML = ".iu { visibility: hidden }"; (document.getElementsByTagName("head")[0] || html).appendChild(s); } // facebook better home timeline performance // all the HTML resized images make rendering CPU intensive else if (document.URL.indexOf("www.facebook.com") > -1) { var home_stream = document.getElementById("home_stream"); home_stream && (home_stream.style.webkitTransform = "translateZ(0)"); } // disable fixed background if (!options.fixedBackground && !isExcluded) { body.style.backgroundAttachment = "scroll"; html.style.backgroundAttachment = "scroll"; } } /************************************************ * SCROLLING ************************************************/ var que = []; var pending = false; var lastScroll = +new Date; /** * Pushes scroll actions to the scrolling queue. */ function scrollArray(elem, left, top, delay) { delay || (delay = 1000); directionCheck(left, top); if (options.accelerationMax != 1) { var now = +new Date; var elapsed = now - lastScroll; if (elapsed < options.accelerationDelta) { var factor = (1 + (30 / elapsed)) / 2; if (factor > 1) { factor = Math.min(factor, options.accelerationMax); left *= factor; top *= factor; } } lastScroll = +new Date; } // push a scroll command que.push({ x: left, y: top, lastX: (left < 0) ? 0.99 : -0.99, lastY: (top < 0) ? 0.99 : -0.99, start: +new Date }); // don't act if there's a pending queue if (pending) { return; } var scrollWindow = (elem === document.body); var step = function (time) { var now = +new Date; var scrollX = 0; var scrollY = 0; for (var i = 0; i < que.length; i++) { var item = que[i]; var elapsed = now - item.start; var finished = (elapsed >= options.animationTime); // scroll position: [0, 1] var position = (finished) ? 1 : elapsed / options.animationTime; // easing [optional] if (options.pulseAlgorithm) { position = pulse(position); } // only need the difference var x = (item.x * position - item.lastX) >> 0; var y = (item.y * position - item.lastY) >> 0; // add this to the total scrolling scrollX += x; scrollY += y; // update last values item.lastX += x; item.lastY += y; // delete and step back if it's over if (finished) { que.splice(i, 1); i--; } } // scroll left and top if (scrollWindow) { window.scrollBy(scrollX, scrollY); } else { if (scrollX) elem.scrollLeft += scrollX; if (scrollY) elem.scrollTop += scrollY; } // clean up if there's nothing left to do if (!left && !top) { que = []; } if (que.length) { requestFrame(step, elem, (delay / options.frameRate + 1)); } else { pending = false; } }; // start a new queue of actions requestFrame(step, elem, 0); pending = true; } /*********************************************** * EVENTS ***********************************************/ /** * Mouse wheel handler. * @param {Object} event */ function wheel(event) { if (!initDone) { init(); } var target = event.target; var overflowing = overflowingAncestor(target); // use default if there's no overflowing // element or default action is prevented if (!overflowing || event.defaultPrevented || isNodeName(activeElement, "embed") || (isNodeName(target, "embed") && /\.pdf/i.test(target.src))) { return true; } var deltaX = event.wheelDeltaX || 0; var deltaY = event.wheelDeltaY || 0; // use wheelDelta if deltaX/Y is not available if (!deltaX && !deltaY) { deltaY = event.wheelDelta || 0; } // check if it's a touchpad scroll that should be ignored if (!options.touchpadSupport && isTouchpad(deltaY)) { return true; } // scale by step size // delta is 120 most of the time // synaptics seems to send 1 sometimes if (Math.abs(deltaX) > 1.2) { deltaX *= options.stepSize / 120; } if (Math.abs(deltaY) > 1.2) { deltaY *= options.stepSize / 120; } scrollArray(overflowing, -deltaX, -deltaY); event.preventDefault(); } /** * Keydown event handler. * @param {Object} event */ function keydown(event) { var target = event.target; var modifier = event.ctrlKey || event.altKey || event.metaKey || (event.shiftKey && event.keyCode !== key.spacebar); // do nothing if user is editing text // or using a modifier key (except shift) // or in a dropdown if ( /input|textarea|select|embed/i.test(target.nodeName) || target.isContentEditable || event.defaultPrevented || modifier ) { return true; } // spacebar should trigger button press if (isNodeName(target, "button") && event.keyCode === key.spacebar) { return true; } var shift, x = 0, y = 0; var elem = overflowingAncestor(activeElement); var clientHeight = elem.clientHeight; if (elem == document.body) { clientHeight = window.innerHeight; } switch (event.keyCode) { case key.up: y = -options.arrowScroll; break; case key.down: y = options.arrowScroll; break; case key.spacebar: // (+ shift) shift = event.shiftKey ? 1 : -1; y = -shift * clientHeight * 0.9; break; case key.pageup: y = -clientHeight * 0.9; break; case key.pagedown: y = clientHeight * 0.9; break; case key.home: y = -elem.scrollTop; break; case key.end: var damt = elem.scrollHeight - elem.scrollTop - clientHeight; y = (damt > 0) ? damt+10 : 0; break; case key.left: x = -options.arrowScroll; break; case key.right: x = options.arrowScroll; break; default: return true; // a key we don't care about } scrollArray(elem, x, y); event.preventDefault(); } /** * Mousedown event only for updating activeElement */ function mousedown(event) { activeElement = event.target; } /*********************************************** * OVERFLOW ***********************************************/ var cache = {}; // cleared out every once in while setInterval(function () { cache = {}; }, 10 * 1000); var uniqueID = (function () { var i = 0; return function (el) { return el.uniqueID || (el.uniqueID = i++); }; })(); function setCache(elems, overflowing) { for (var i = elems.length; i--;) cache[uniqueID(elems[i])] = overflowing; return overflowing; } function overflowingAncestor(el) { var elems = []; var rootScrollHeight = root.scrollHeight; do { var cached = cache[uniqueID(el)]; if (cached) { return setCache(elems, cached); } elems.push(el); if (rootScrollHeight === el.scrollHeight) { if (!isFrame || root.clientHeight + 10 < rootScrollHeight) { return setCache(elems, document.body); // scrolling root in WebKit } } else if (el.clientHeight + 10 < el.scrollHeight) { overflow = getComputedStyle(el, "").getPropertyValue("overflow-y"); if (overflow === "scroll" || overflow === "auto") { return setCache(elems, el); } } } while (el = el.parentNode); } /*********************************************** * HELPERS ***********************************************/ function addEvent(type, fn, bubble) { window.addEventListener(type, fn, (bubble||false)); } function removeEvent(type, fn, bubble) { window.removeEventListener(type, fn, (bubble||false)); } function isNodeName(el, tag) { return (el.nodeName||"").toLowerCase() === tag.toLowerCase(); } function directionCheck(x, y) { x = (x > 0) ? 1 : -1; y = (y > 0) ? 1 : -1; if (direction.x !== x || direction.y !== y) { direction.x = x; direction.y = y; que = []; lastScroll = 0; } } var deltaBufferTimer; function isTouchpad(deltaY) { if (!deltaY) return; deltaY = Math.abs(deltaY) deltaBuffer.push(deltaY); deltaBuffer.shift(); clearTimeout(deltaBufferTimer); var allEquals = (deltaBuffer[0] == deltaBuffer[1] && deltaBuffer[1] == deltaBuffer[2]); var allDivisable = (isDivisible(deltaBuffer[0], 120) && isDivisible(deltaBuffer[1], 120) && isDivisible(deltaBuffer[2], 120)); return !(allEquals || allDivisable); } function isDivisible(n, divisor) { return (Math.floor(n / divisor) == n / divisor); } var requestFrame = (function () { return window.requestAnimationFrame || window.webkitRequestAnimationFrame || function (callback, element, delay) { window.setTimeout(callback, delay || (1000/60)); }; })(); var MutationObserver = window.MutationObserver || window.WebKitMutationObserver; /*********************************************** * PULSE ***********************************************/ /** * Viscous fluid with a pulse for part and decay for the rest. * - Applies a fixed force over an interval (a damped acceleration), and * - Lets the exponential bleed away the velocity over a longer interval * - Michael Herf, http://stereopsis.com/stopping/ */ function pulse_(x) { var val, start, expx; // test x = x * options.pulseScale; if (x < 1) { // acceleartion val = x - (1 - Math.exp(-x)); } else { // tail // the previous animation ended here: start = Math.exp(-1); // simple viscous drag x -= 1; expx = 1 - Math.exp(-x); val = start + (expx * (1 - start)); } return val * options.pulseNormalize; } function pulse(x) { if (x >= 1) return 1; if (x <= 0) return 0; if (options.pulseNormalize == 1) { options.pulseNormalize /= pulse_(1); } return pulse_(x); } addEvent("mousedown", mousedown); addEvent("mousewheel", wheel); addEvent("load", init); } }); })(jQuery); jQuery(document).ready(function(){ jQuery.smoothScroll(); });