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Diffstat (limited to 'js/spin.js')
| -rw-r--r-- | js/spin.js | 349 |
1 files changed, 349 insertions, 0 deletions
diff --git a/js/spin.js b/js/spin.js new file mode 100644 index 000000000..c66c607a7 --- /dev/null +++ b/js/spin.js @@ -0,0 +1,349 @@ +//fgnass.github.com/spin.js#v1.3 + +/** + * Copyright (c) 2011-2013 Felix Gnass + * Licensed under the MIT license + */ +(function(root, factory) { + + /* CommonJS */ + if (typeof exports == 'object') module.exports = factory() + + /* AMD module */ + else if (typeof define == 'function' && define.amd) define(factory) + + /* Browser global */ + else root.Spinner = factory() +} +(this, function() { + "use strict"; + + var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */ + , animations = {} /* Animation rules keyed by their name */ + , useCssAnimations /* Whether to use CSS animations or setTimeout */ + + /** + * Utility function to create elements. If no tag name is given, + * a DIV is created. Optionally properties can be passed. + */ + function createEl(tag, prop) { + var el = document.createElement(tag || 'div') + , n + + for(n in prop) el[n] = prop[n] + return el + } + + /** + * Appends children and returns the parent. + */ + function ins(parent /* child1, child2, ...*/) { + for (var i=1, n=arguments.length; i<n; i++) + parent.appendChild(arguments[i]) + + return parent + } + + /** + * Insert a new stylesheet to hold the @keyframe or VML rules. + */ + var sheet = (function() { + var el = createEl('style', {type : 'text/css'}) + ins(document.getElementsByTagName('head')[0], el) + return el.sheet || el.styleSheet + }()) + + /** + * Creates an opacity keyframe animation rule and returns its name. + * Since most mobile Webkits have timing issues with animation-delay, + * we create separate rules for each line/segment. + */ + function addAnimation(alpha, trail, i, lines) { + var name = ['opacity', trail, ~~(alpha*100), i, lines].join('-') + , start = 0.01 + i/lines * 100 + , z = Math.max(1 - (1-alpha) / trail * (100-start), alpha) + , prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase() + , pre = prefix && '-' + prefix + '-' || '' + + if (!animations[name]) { + sheet.insertRule( + '@' + pre + 'keyframes ' + name + '{' + + '0%{opacity:' + z + '}' + + start + '%{opacity:' + alpha + '}' + + (start+0.01) + '%{opacity:1}' + + (start+trail) % 100 + '%{opacity:' + alpha + '}' + + '100%{opacity:' + z + '}' + + '}', sheet.cssRules.length) + + animations[name] = 1 + } + + return name + } + + /** + * Tries various vendor prefixes and returns the first supported property. + */ + function vendor(el, prop) { + var s = el.style + , pp + , i + + if(s[prop] !== undefined) return prop + prop = prop.charAt(0).toUpperCase() + prop.slice(1) + for(i=0; i<prefixes.length; i++) { + pp = prefixes[i]+prop + if(s[pp] !== undefined) return pp + } + } + + /** + * Sets multiple style properties at once. + */ + function css(el, prop) { + for (var n in prop) + el.style[vendor(el, n)||n] = prop[n] + + return el + } + + /** + * Fills in default values. + */ + function merge(obj) { + for (var i=1; i < arguments.length; i++) { + var def = arguments[i] + for (var n in def) + if (obj[n] === undefined) obj[n] = def[n] + } + return obj + } + + /** + * Returns the absolute page-offset of the given element. + */ + function pos(el) { + var o = { x:el.offsetLeft, y:el.offsetTop } + while((el = el.offsetParent)) + o.x+=el.offsetLeft, o.y+=el.offsetTop + + return o + } + + // Built-in defaults + + var defaults = { + lines: 12, // The number of lines to draw + length: 7, // The length of each line + width: 5, // The line thickness + radius: 10, // The radius of the inner circle + rotate: 0, // Rotation offset + corners: 1, // Roundness (0..1) + color: '#000', // #rgb or #rrggbb + direction: 1, // 1: clockwise, -1: counterclockwise + speed: 1, // Rounds per second + trail: 100, // Afterglow percentage + opacity: 1/4, // Opacity of the lines + fps: 20, // Frames per second when using setTimeout() + zIndex: 2e9, // Use a high z-index by default + className: 'spinner', // CSS class to assign to the element + top: 'auto', // center vertically + left: 'auto', // center horizontally + position: 'relative' // element position + } + + /** The constructor */ + function Spinner(o) { + if (typeof this == 'undefined') return new Spinner(o) + this.opts = merge(o || {}, Spinner.defaults, defaults) + } + + // Global defaults that override the built-ins: + Spinner.defaults = {} + + merge(Spinner.prototype, { + + /** + * Adds the spinner to the given target element. If this instance is already + * spinning, it is automatically removed from its previous target b calling + * stop() internally. + */ + spin: function(target) { + this.stop() + + var self = this + , o = self.opts + , el = self.el = css(createEl(0, {className: o.className}), {position: o.position, width: 0, zIndex: o.zIndex}) + , mid = o.radius+o.length+o.width + , ep // element position + , tp // target position + + if (target) { + target.insertBefore(el, target.firstChild||null) + tp = pos(target) + ep = pos(el) + css(el, { + left: (o.left == 'auto' ? tp.x-ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px', + top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid) + 'px' + }) + } + + el.setAttribute('role', 'progressbar') + self.lines(el, self.opts) + + if (!useCssAnimations) { + // No CSS animation support, use setTimeout() instead + var i = 0 + , start = (o.lines - 1) * (1 - o.direction) / 2 + , alpha + , fps = o.fps + , f = fps/o.speed + , ostep = (1-o.opacity) / (f*o.trail / 100) + , astep = f/o.lines + + ;(function anim() { + i++; + for (var j = 0; j < o.lines; j++) { + alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity) + + self.opacity(el, j * o.direction + start, alpha, o) + } + self.timeout = self.el && setTimeout(anim, ~~(1000/fps)) + })() + } + return self + }, + + /** + * Stops and removes the Spinner. + */ + stop: function() { + var el = this.el + if (el) { + clearTimeout(this.timeout) + if (el.parentNode) el.parentNode.removeChild(el) + this.el = undefined + } + return this + }, + + /** + * Internal method that draws the individual lines. Will be overwritten + * in VML fallback mode below. + */ + lines: function(el, o) { + var i = 0 + , start = (o.lines - 1) * (1 - o.direction) / 2 + , seg + + function fill(color, shadow) { + return css(createEl(), { + position: 'absolute', + width: (o.length+o.width) + 'px', + height: o.width + 'px', + background: color, + boxShadow: shadow, + transformOrigin: 'left', + transform: 'rotate(' + ~~(360/o.lines*i+o.rotate) + 'deg) translate(' + o.radius+'px' +',0)', + borderRadius: (o.corners * o.width>>1) + 'px' + }) + } + + for (; i < o.lines; i++) { + seg = css(createEl(), { + position: 'absolute', + top: 1+~(o.width/2) + 'px', + transform: o.hwaccel ? 'translate3d(0,0,0)' : '', + opacity: o.opacity, + animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1/o.speed + 's linear infinite' + }) + + if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {top: 2+'px'})) + + ins(el, ins(seg, fill(o.color, '0 0 1px rgba(0,0,0,.1)'))) + } + return el + }, + + /** + * Internal method that adjusts the opacity of a single line. + * Will be overwritten in VML fallback mode below. + */ + opacity: function(el, i, val) { + if (i < el.childNodes.length) el.childNodes[i].style.opacity = val + } + + }) + + + function initVML() { + + /* Utility function to create a VML tag */ + function vml(tag, attr) { + return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr) + } + + // No CSS transforms but VML support, add a CSS rule for VML elements: + sheet.addRule('.spin-vml', 'behavior:url(#default#VML)') + + Spinner.prototype.lines = function(el, o) { + var r = o.length+o.width + , s = 2*r + + function grp() { + return css( + vml('group', { + coordsize: s + ' ' + s, + coordorigin: -r + ' ' + -r + }), + { width: s, height: s } + ) + } + + var margin = -(o.width+o.length)*2 + 'px' + , g = css(grp(), {position: 'absolute', top: margin, left: margin}) + , i + + function seg(i, dx, filter) { + ins(g, + ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}), + ins(css(vml('roundrect', {arcsize: o.corners}), { + width: r, + height: o.width, + left: o.radius, + top: -o.width>>1, + filter: filter + }), + vml('fill', {color: o.color, opacity: o.opacity}), + vml('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change + ) + ) + ) + } + + if (o.shadow) + for (i = 1; i <= o.lines; i++) + seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)') + + for (i = 1; i <= o.lines; i++) seg(i) + return ins(el, g) + } + + Spinner.prototype.opacity = function(el, i, val, o) { + var c = el.firstChild + o = o.shadow && o.lines || 0 + if (c && i+o < c.childNodes.length) { + c = c.childNodes[i+o]; c = c && c.firstChild; c = c && c.firstChild + if (c) c.opacity = val + } + } + } + + var probe = css(createEl('group'), {behavior: 'url(#default#VML)'}) + + if (!vendor(probe, 'transform') && probe.adj) initVML() + else useCssAnimations = vendor(probe, 'animation') + + return Spinner + +})); |