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301 lines
8.9 KiB
301 lines
8.9 KiB
//fgnass.github.com/spin.js#v1.2.4
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(function(window, document, undefined) {
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/**
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* Copyright (c) 2011 Felix Gnass [fgnass at neteye dot de]
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* Licensed under the MIT license
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*/
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var prefixes = ['webkit', 'Moz', 'ms', 'O']; /* Vendor prefixes */
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var animations = {}; /* Animation rules keyed by their name */
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var useCssAnimations;
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/**
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* Utility function to create elements. If no tag name is given,
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* a DIV is created. Optionally properties can be passed.
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*/
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function createEl(tag, prop) {
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var el = document.createElement(tag || 'div');
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var n;
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for(n in prop) {
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el[n] = prop[n];
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}
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return el;
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}
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/**
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* Appends children and returns the parent.
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*/
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function ins(parent /* child1, child2, ...*/) {
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for (var i=1, n=arguments.length; i<n; i++) {
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parent.appendChild(arguments[i]);
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}
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return parent;
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}
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/**
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* Insert a new stylesheet to hold the @keyframe or VML rules.
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*/
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var sheet = function() {
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var el = createEl('style');
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ins(document.getElementsByTagName('head')[0], el);
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return el.sheet || el.styleSheet;
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}();
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/**
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* Creates an opacity keyframe animation rule and returns its name.
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* Since most mobile Webkits have timing issues with animation-delay,
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* we create separate rules for each line/segment.
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*/
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function addAnimation(alpha, trail, i, lines) {
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var name = ['opacity', trail, ~~(alpha*100), i, lines].join('-');
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var start = 0.01 + i/lines*100;
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var z = Math.max(1-(1-alpha)/trail*(100-start) , alpha);
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var prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase();
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var pre = prefix && '-'+prefix+'-' || '';
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if (!animations[name]) {
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sheet.insertRule(
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'@' + pre + 'keyframes ' + name + '{' +
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'0%{opacity:'+z+'}' +
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start + '%{opacity:'+ alpha + '}' +
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(start+0.01) + '%{opacity:1}' +
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(start+trail)%100 + '%{opacity:'+ alpha + '}' +
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'100%{opacity:'+ z + '}' +
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'}', 0);
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animations[name] = 1;
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}
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return name;
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}
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/**
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* Tries various vendor prefixes and returns the first supported property.
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**/
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function vendor(el, prop) {
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var s = el.style;
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var pp;
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var i;
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if(s[prop] !== undefined) return prop;
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prop = prop.charAt(0).toUpperCase() + prop.slice(1);
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for(i=0; i<prefixes.length; i++) {
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pp = prefixes[i]+prop;
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if(s[pp] !== undefined) return pp;
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}
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}
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/**
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* Sets multiple style properties at once.
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*/
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function css(el, prop) {
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for (var n in prop) {
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el.style[vendor(el, n)||n] = prop[n];
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}
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return el;
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}
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/**
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* Fills in default values.
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*/
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function merge(obj) {
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for (var i=1; i < arguments.length; i++) {
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var def = arguments[i];
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for (var n in def) {
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if (obj[n] === undefined) obj[n] = def[n];
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}
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}
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return obj;
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}
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/**
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* Returns the absolute page-offset of the given element.
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*/
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function pos(el) {
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var o = {x:el.offsetLeft, y:el.offsetTop};
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while((el = el.offsetParent)) {
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o.x+=el.offsetLeft;
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o.y+=el.offsetTop;
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}
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return o;
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}
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var defaults = {
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lines: 12, // The number of lines to draw
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length: 7, // The length of each line
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width: 5, // The line thickness
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radius: 10, // The radius of the inner circle
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color: '#000', // #rgb or #rrggbb
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speed: 1, // Rounds per second
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trail: 100, // Afterglow percentage
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opacity: 1/4, // Opacity of the lines
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fps: 20, // Frames per second when using setTimeout()
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zIndex: 2e9, // Use a high z-index by default
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className: 'spinner', // CSS class to assign to the element
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top: 'auto', // center vertically
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left: 'auto' // center horizontally
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};
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/** The constructor */
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var Spinner = function Spinner(o) {
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if (!this.spin) return new Spinner(o);
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this.opts = merge(o || {}, Spinner.defaults, defaults);
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};
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Spinner.defaults = {};
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Spinner.prototype = {
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spin: function(target) {
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this.stop();
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var self = this;
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var o = self.opts;
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var el = self.el = css(createEl(0, {className: o.className}), {position: 'relative', zIndex: o.zIndex});
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var mid = o.radius+o.length+o.width;
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var ep; // element position
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var tp; // target position
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if (target) {
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target.insertBefore(el, target.firstChild||null);
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tp = pos(target);
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ep = pos(el);
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css(el, {
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left: (o.left == 'auto' ? tp.x-ep.x + (target.offsetWidth >> 1) : o.left+mid) + 'px',
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top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : o.top+mid) + 'px'
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});
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}
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el.setAttribute('aria-role', 'progressbar');
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self.lines(el, self.opts);
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if (!useCssAnimations) {
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// No CSS animation support, use setTimeout() instead
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var i = 0;
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var fps = o.fps;
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var f = fps/o.speed;
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var ostep = (1-o.opacity)/(f*o.trail / 100);
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var astep = f/o.lines;
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!function anim() {
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i++;
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for (var s=o.lines; s; s--) {
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var alpha = Math.max(1-(i+s*astep)%f * ostep, o.opacity);
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self.opacity(el, o.lines-s, alpha, o);
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}
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self.timeout = self.el && setTimeout(anim, ~~(1000/fps));
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}();
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}
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return self;
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},
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stop: function() {
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var el = this.el;
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if (el) {
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clearTimeout(this.timeout);
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if (el.parentNode) el.parentNode.removeChild(el);
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this.el = undefined;
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}
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return this;
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},
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lines: function(el, o) {
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var i = 0;
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var seg;
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function fill(color, shadow) {
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return css(createEl(), {
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position: 'absolute',
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width: (o.length+o.width) + 'px',
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height: o.width + 'px',
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background: color,
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boxShadow: shadow,
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transformOrigin: 'left',
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transform: 'rotate(' + ~~(360/o.lines*i) + 'deg) translate(' + o.radius+'px' +',0)',
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borderRadius: (o.width>>1) + 'px'
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});
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}
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for (; i < o.lines; i++) {
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seg = css(createEl(), {
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position: 'absolute',
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top: 1+~(o.width/2) + 'px',
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transform: o.hwaccel ? 'translate3d(0,0,0)' : '',
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opacity: o.opacity,
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animation: useCssAnimations && addAnimation(o.opacity, o.trail, i, o.lines) + ' ' + 1/o.speed + 's linear infinite'
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});
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if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {top: 2+'px'}));
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ins(el, ins(seg, fill(o.color, '0 0 1px rgba(0,0,0,.1)')));
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}
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return el;
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},
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opacity: function(el, i, val) {
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if (i < el.childNodes.length) el.childNodes[i].style.opacity = val;
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}
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};
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/////////////////////////////////////////////////////////////////////////
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// VML rendering for IE
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/////////////////////////////////////////////////////////////////////////
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/**
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* Check and init VML support
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*/
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!function() {
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var s = css(createEl('group'), {behavior: 'url(#default#VML)'});
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var i;
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if (!vendor(s, 'transform') && s.adj) {
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// VML support detected. Insert CSS rules ...
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for (i=4; i--;) sheet.addRule(['group', 'roundrect', 'fill', 'stroke'][i], 'behavior:url(#default#VML)');
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Spinner.prototype.lines = function(el, o) {
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var r = o.length+o.width;
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var s = 2*r;
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function grp() {
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return css(createEl('group', {coordsize: s +' '+s, coordorigin: -r +' '+-r}), {width: s, height: s});
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}
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var margin = -(o.width+o.length)*2+'px';
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var g = css(grp(), {position: 'absolute', top: margin, left: margin});
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var i;
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function seg(i, dx, filter) {
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ins(g,
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ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}),
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ins(css(createEl('roundrect', {arcsize: 1}), {
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width: r,
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height: o.width,
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left: o.radius,
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top: -o.width>>1,
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filter: filter
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}),
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createEl('fill', {color: o.color, opacity: o.opacity}),
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createEl('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change
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)
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)
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);
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}
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if (o.shadow) {
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for (i = 1; i <= o.lines; i++) {
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seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)');
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}
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}
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for (i = 1; i <= o.lines; i++) seg(i);
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return ins(el, g);
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};
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Spinner.prototype.opacity = function(el, i, val, o) {
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var c = el.firstChild;
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o = o.shadow && o.lines || 0;
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if (c && i+o < c.childNodes.length) {
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c = c.childNodes[i+o]; c = c && c.firstChild; c = c && c.firstChild;
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if (c) c.opacity = val;
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}
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};
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}
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else {
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useCssAnimations = vendor(s, 'animation');
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}
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}();
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window.Spinner = Spinner;
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})(window, document);
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