/**
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* Copyright (c) 2011-2014 Felix Gnass
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* Licensed under the MIT license
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*/
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(function(root, factory) {
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/* CommonJS */
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if (typeof exports == 'object') module.exports = factory()
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/* AMD module */
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else if (typeof define == 'function' && define.amd) define(factory)
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/* Browser global */
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else root.Spinner = factory()
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}
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(this, function() {
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"use strict";
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var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */
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, animations = {} /* Animation rules keyed by their name */
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, useCssAnimations /* Whether to use CSS animations or setTimeout */
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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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, n
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for(n in prop) el[n] = prop[n]
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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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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', {type : 'text/css'})
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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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, start = 0.01 + i/lines * 100
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, z = Math.max(1 - (1-alpha) / trail * (100-start), alpha)
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, prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase()
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, 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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'}', sheet.cssRules.length)
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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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, pp
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, i
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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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if(s[prop] !== undefined) return prop
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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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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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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, o.y+=el.offsetTop
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return o
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}
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/**
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* Returns the line color from the given string or array.
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*/
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function getColor(color, idx) {
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return typeof color == 'string' ? color : color[idx % color.length]
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}
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// Built-in defaults
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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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rotate: 0, // Rotation offset
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corners: 1, // Roundness (0..1)
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color: '#000', // #rgb or #rrggbb
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direction: 1, // 1: clockwise, -1: counterclockwise
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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: '50%', // center vertically
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left: '50%', // center horizontally
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position: 'absolute' // element position
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}
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/** The constructor */
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function Spinner(o) {
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this.opts = merge(o || {}, Spinner.defaults, defaults)
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}
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// Global defaults that override the built-ins:
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Spinner.defaults = {}
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merge(Spinner.prototype, {
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/**
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* Adds the spinner to the given target element. If this instance is already
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* spinning, it is automatically removed from its previous target b calling
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* stop() internally.
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*/
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spin: function(target) {
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this.stop()
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var self = this
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, o = self.opts
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, el = self.el = css(createEl(0, {className: o.className}), {position: o.position, width: 0, zIndex: o.zIndex})
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, mid = o.radius+o.length+o.width
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css(el, {
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left: o.left,
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top: o.top
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})
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if (target) {
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target.insertBefore(el, target.firstChild||null)
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}
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el.setAttribute('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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, start = (o.lines - 1) * (1 - o.direction) / 2
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, alpha
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, fps = o.fps
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, f = fps/o.speed
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, ostep = (1-o.opacity) / (f*o.trail / 100)
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, astep = f/o.lines
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;(function anim() {
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i++;
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for (var j = 0; j < o.lines; j++) {
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alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity)
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self.opacity(el, j * o.direction + start, 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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/**
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* Stops and removes the Spinner.
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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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/**
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* Internal method that draws the individual lines. Will be overwritten
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* in VML fallback mode below.
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*/
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lines: function(el, o) {
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var i = 0
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, start = (o.lines - 1) * (1 - o.direction) / 2
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, 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+o.rotate) + 'deg) translate(' + o.radius+'px' +',0)',
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borderRadius: (o.corners * 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, start + i * o.direction, 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(getColor(o.color, i), '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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/**
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* Internal method that adjusts the opacity of a single line.
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* Will be overwritten in VML fallback mode below.
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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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function initVML() {
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/* Utility function to create a VML tag */
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function vml(tag, attr) {
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return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr)
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}
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// No CSS transforms but VML support, add a CSS rule for VML elements:
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sheet.addRule('.spin-vml', '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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, s = 2*r
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function grp() {
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return css(
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vml('group', {
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coordsize: s + ' ' + s,
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coordorigin: -r + ' ' + -r
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}),
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{ width: s, height: s }
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)
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}
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var margin = -(o.width+o.length)*2 + 'px'
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, g = css(grp(), {position: 'absolute', top: margin, left: margin})
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, 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(vml('roundrect', {arcsize: o.corners}), {
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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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vml('fill', {color: getColor(o.color, i), opacity: o.opacity}),
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vml('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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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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var probe = css(createEl('group'), {behavior: 'url(#default#VML)'})
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if (!vendor(probe, 'transform') && probe.adj) initVML()
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else useCssAnimations = vendor(probe, 'animation')
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return Spinner
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}));
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