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spin.js
350 lines
| 1 | //fgnass.github.com/spin.js#v1.3 |
| 2 | |
| 3 | /** |
| 4 | * Copyright (c) 2011-2013 Felix Gnass |
| 5 | * Licensed under the MIT license |
| 6 | */ |
| 7 | (function(root, factory) { |
| 8 | |
| 9 | /* CommonJS */ |
| 10 | if (typeof exports == 'object') module.exports = factory() |
| 11 | |
| 12 | /* AMD module */ |
| 13 | else if (typeof define == 'function' && define.amd) define(factory) |
| 14 | |
| 15 | /* Browser global */ |
| 16 | else root.Spinner = factory() |
| 17 | } |
| 18 | (this, function() { |
| 19 | "use strict"; |
| 20 | |
| 21 | var prefixes = ['webkit', 'Moz', 'ms', 'O'] /* Vendor prefixes */ |
| 22 | , animations = {} /* Animation rules keyed by their name */ |
| 23 | , useCssAnimations /* Whether to use CSS animations or setTimeout */ |
| 24 | |
| 25 | /** |
| 26 | * Utility function to create elements. If no tag name is given, |
| 27 | * a DIV is created. Optionally properties can be passed. |
| 28 | */ |
| 29 | function createEl(tag, prop) { |
| 30 | var el = document.createElement(tag || 'div') |
| 31 | , n |
| 32 | |
| 33 | for(n in prop) el[n] = prop[n] |
| 34 | return el |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * Appends children and returns the parent. |
| 39 | */ |
| 40 | function ins(parent /* child1, child2, ...*/) { |
| 41 | for (var i=1, n=arguments.length; i<n; i++) |
| 42 | parent.appendChild(arguments[i]) |
| 43 | |
| 44 | return parent |
| 45 | } |
| 46 | |
| 47 | /** |
| 48 | * Insert a new stylesheet to hold the @keyframe or VML rules. |
| 49 | */ |
| 50 | var sheet = (function() { |
| 51 | var el = createEl('style', {type : 'text/css'}) |
| 52 | ins(document.getElementsByTagName('head')[0], el) |
| 53 | return el.sheet || el.styleSheet |
| 54 | }()) |
| 55 | |
| 56 | /** |
| 57 | * Creates an opacity keyframe animation rule and returns its name. |
| 58 | * Since most mobile Webkits have timing issues with animation-delay, |
| 59 | * we create separate rules for each line/segment. |
| 60 | */ |
| 61 | function addAnimation(alpha, trail, i, lines) { |
| 62 | var name = ['opacity', trail, ~~(alpha*100), i, lines].join('-') |
| 63 | , start = 0.01 + i/lines * 100 |
| 64 | , z = Math.max(1 - (1-alpha) / trail * (100-start), alpha) |
| 65 | , prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase() |
| 66 | , pre = prefix && '-' + prefix + '-' || '' |
| 67 | |
| 68 | if (!animations[name]) { |
| 69 | sheet.insertRule( |
| 70 | '@' + pre + 'keyframes ' + name + '{' + |
| 71 | '0%{opacity:' + z + '}' + |
| 72 | start + '%{opacity:' + alpha + '}' + |
| 73 | (start+0.01) + '%{opacity:1}' + |
| 74 | (start+trail) % 100 + '%{opacity:' + alpha + '}' + |
| 75 | '100%{opacity:' + z + '}' + |
| 76 | '}', sheet.cssRules.length) |
| 77 | |
| 78 | animations[name] = 1 |
| 79 | } |
| 80 | |
| 81 | return name |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Tries various vendor prefixes and returns the first supported property. |
| 86 | */ |
| 87 | function vendor(el, prop) { |
| 88 | var s = el.style |
| 89 | , pp |
| 90 | , i |
| 91 | |
| 92 | if(s[prop] !== undefined) return prop |
| 93 | prop = prop.charAt(0).toUpperCase() + prop.slice(1) |
| 94 | for(i=0; i<prefixes.length; i++) { |
| 95 | pp = prefixes[i]+prop |
| 96 | if(s[pp] !== undefined) return pp |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Sets multiple style properties at once. |
| 102 | */ |
| 103 | function css(el, prop) { |
| 104 | for (var n in prop) |
| 105 | el.style[vendor(el, n)||n] = prop[n] |
| 106 | |
| 107 | return el |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * Fills in default values. |
| 112 | */ |
| 113 | function merge(obj) { |
| 114 | for (var i=1; i < arguments.length; i++) { |
| 115 | var def = arguments[i] |
| 116 | for (var n in def) |
| 117 | if (obj[n] === undefined) obj[n] = def[n] |
| 118 | } |
| 119 | return obj |
| 120 | } |
| 121 | |
| 122 | /** |
| 123 | * Returns the absolute page-offset of the given element. |
| 124 | */ |
| 125 | function pos(el) { |
| 126 | var o = { x:el.offsetLeft, y:el.offsetTop } |
| 127 | while((el = el.offsetParent)) |
| 128 | o.x+=el.offsetLeft, o.y+=el.offsetTop |
| 129 | |
| 130 | return o |
| 131 | } |
| 132 | |
| 133 | // Built-in defaults |
| 134 | |
| 135 | var defaults = { |
| 136 | lines: 12, // The number of lines to draw |
| 137 | length: 7, // The length of each line |
| 138 | width: 5, // The line thickness |
| 139 | radius: 10, // The radius of the inner circle |
| 140 | rotate: 0, // Rotation offset |
| 141 | corners: 1, // Roundness (0..1) |
| 142 | color: '#000', // #rgb or #rrggbb |
| 143 | direction: 1, // 1: clockwise, -1: counterclockwise |
| 144 | speed: 1, // Rounds per second |
| 145 | trail: 100, // Afterglow percentage |
| 146 | opacity: 1/4, // Opacity of the lines |
| 147 | fps: 20, // Frames per second when using setTimeout() |
| 148 | zIndex: 2e9, // Use a high z-index by default |
| 149 | className: 'spinner', // CSS class to assign to the element |
| 150 | top: 'auto', // center vertically |
| 151 | left: 'auto', // center horizontally |
| 152 | position: 'relative' // element position |
| 153 | } |
| 154 | |
| 155 | /** The constructor */ |
| 156 | function Spinner(o) { |
| 157 | if (typeof this == 'undefined') return new Spinner(o) |
| 158 | this.opts = merge(o || {}, Spinner.defaults, defaults) |
| 159 | } |
| 160 | |
| 161 | // Global defaults that override the built-ins: |
| 162 | Spinner.defaults = {} |
| 163 | |
| 164 | merge(Spinner.prototype, { |
| 165 | |
| 166 | /** |
| 167 | * Adds the spinner to the given target element. If this instance is already |
| 168 | * spinning, it is automatically removed from its previous target b calling |
| 169 | * stop() internally. |
| 170 | */ |
| 171 | spin: function(target) { |
| 172 | this.stop() |
| 173 | |
| 174 | var self = this |
| 175 | , o = self.opts |
| 176 | , el = self.el = css(createEl(0, {className: o.className}), {position: o.position, width: 0, zIndex: o.zIndex}) |
| 177 | , mid = o.radius+o.length+o.width |
| 178 | , ep // element position |
| 179 | , tp // target position |
| 180 | |
| 181 | if (target) { |
| 182 | target.insertBefore(el, target.firstChild||null) |
| 183 | tp = pos(target) |
| 184 | ep = pos(el) |
| 185 | css(el, { |
| 186 | left: (o.left == 'auto' ? tp.x-ep.x + (target.offsetWidth >> 1) : parseInt(o.left, 10) + mid) + 'px', |
| 187 | top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : parseInt(o.top, 10) + mid) + 'px' |
| 188 | }) |
| 189 | } |
| 190 | |
| 191 | el.setAttribute('role', 'progressbar') |
| 192 | self.lines(el, self.opts) |
| 193 | |
| 194 | if (!useCssAnimations) { |
| 195 | // No CSS animation support, use setTimeout() instead |
| 196 | var i = 0 |
| 197 | , start = (o.lines - 1) * (1 - o.direction) / 2 |
| 198 | , alpha |
| 199 | , fps = o.fps |
| 200 | , f = fps/o.speed |
| 201 | , ostep = (1-o.opacity) / (f*o.trail / 100) |
| 202 | , astep = f/o.lines |
| 203 | |
| 204 | ;(function anim() { |
| 205 | i++; |
| 206 | for (var j = 0; j < o.lines; j++) { |
| 207 | alpha = Math.max(1 - (i + (o.lines - j) * astep) % f * ostep, o.opacity) |
| 208 | |
| 209 | self.opacity(el, j * o.direction + start, alpha, o) |
| 210 | } |
| 211 | self.timeout = self.el && setTimeout(anim, ~~(1000/fps)) |
| 212 | })() |
| 213 | } |
| 214 | return self |
| 215 | }, |
| 216 | |
| 217 | /** |
| 218 | * Stops and removes the Spinner. |
| 219 | */ |
| 220 | stop: function() { |
| 221 | var el = this.el |
| 222 | if (el) { |
| 223 | clearTimeout(this.timeout) |
| 224 | if (el.parentNode) el.parentNode.removeChild(el) |
| 225 | this.el = undefined |
| 226 | } |
| 227 | return this |
| 228 | }, |
| 229 | |
| 230 | /** |
| 231 | * Internal method that draws the individual lines. Will be overwritten |
| 232 | * in VML fallback mode below. |
| 233 | */ |
| 234 | lines: function(el, o) { |
| 235 | var i = 0 |
| 236 | , start = (o.lines - 1) * (1 - o.direction) / 2 |
| 237 | , seg |
| 238 | |
| 239 | function fill(color, shadow) { |
| 240 | return css(createEl(), { |
| 241 | position: 'absolute', |
| 242 | width: (o.length+o.width) + 'px', |
| 243 | height: o.width + 'px', |
| 244 | background: color, |
| 245 | boxShadow: shadow, |
| 246 | transformOrigin: 'left', |
| 247 | transform: 'rotate(' + ~~(360/o.lines*i+o.rotate) + 'deg) translate(' + o.radius+'px' +',0)', |
| 248 | borderRadius: (o.corners * o.width>>1) + 'px' |
| 249 | }) |
| 250 | } |
| 251 | |
| 252 | for (; i < o.lines; i++) { |
| 253 | seg = css(createEl(), { |
| 254 | position: 'absolute', |
| 255 | top: 1+~(o.width/2) + 'px', |
| 256 | transform: o.hwaccel ? 'translate3d(0,0,0)' : '', |
| 257 | opacity: o.opacity, |
| 258 | animation: useCssAnimations && addAnimation(o.opacity, o.trail, start + i * o.direction, o.lines) + ' ' + 1/o.speed + 's linear infinite' |
| 259 | }) |
| 260 | |
| 261 | if (o.shadow) ins(seg, css(fill('#000', '0 0 4px ' + '#000'), {top: 2+'px'})) |
| 262 | |
| 263 | ins(el, ins(seg, fill(o.color, '0 0 1px rgba(0,0,0,.1)'))) |
| 264 | } |
| 265 | return el |
| 266 | }, |
| 267 | |
| 268 | /** |
| 269 | * Internal method that adjusts the opacity of a single line. |
| 270 | * Will be overwritten in VML fallback mode below. |
| 271 | */ |
| 272 | opacity: function(el, i, val) { |
| 273 | if (i < el.childNodes.length) el.childNodes[i].style.opacity = val |
| 274 | } |
| 275 | |
| 276 | }) |
| 277 | |
| 278 | |
| 279 | function initVML() { |
| 280 | |
| 281 | /* Utility function to create a VML tag */ |
| 282 | function vml(tag, attr) { |
| 283 | return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr) |
| 284 | } |
| 285 | |
| 286 | // No CSS transforms but VML support, add a CSS rule for VML elements: |
| 287 | sheet.addRule('.spin-vml', 'behavior:url(#default#VML)') |
| 288 | |
| 289 | Spinner.prototype.lines = function(el, o) { |
| 290 | var r = o.length+o.width |
| 291 | , s = 2*r |
| 292 | |
| 293 | function grp() { |
| 294 | return css( |
| 295 | vml('group', { |
| 296 | coordsize: s + ' ' + s, |
| 297 | coordorigin: -r + ' ' + -r |
| 298 | }), |
| 299 | { width: s, height: s } |
| 300 | ) |
| 301 | } |
| 302 | |
| 303 | var margin = -(o.width+o.length)*2 + 'px' |
| 304 | , g = css(grp(), {position: 'absolute', top: margin, left: margin}) |
| 305 | , i |
| 306 | |
| 307 | function seg(i, dx, filter) { |
| 308 | ins(g, |
| 309 | ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}), |
| 310 | ins(css(vml('roundrect', {arcsize: o.corners}), { |
| 311 | width: r, |
| 312 | height: o.width, |
| 313 | left: o.radius, |
| 314 | top: -o.width>>1, |
| 315 | filter: filter |
| 316 | }), |
| 317 | vml('fill', {color: o.color, opacity: o.opacity}), |
| 318 | vml('stroke', {opacity: 0}) // transparent stroke to fix color bleeding upon opacity change |
| 319 | ) |
| 320 | ) |
| 321 | ) |
| 322 | } |
| 323 | |
| 324 | if (o.shadow) |
| 325 | for (i = 1; i <= o.lines; i++) |
| 326 | seg(i, -2, 'progid:DXImageTransform.Microsoft.Blur(pixelradius=2,makeshadow=1,shadowopacity=.3)') |
| 327 | |
| 328 | for (i = 1; i <= o.lines; i++) seg(i) |
| 329 | return ins(el, g) |
| 330 | } |
| 331 | |
| 332 | Spinner.prototype.opacity = function(el, i, val, o) { |
| 333 | var c = el.firstChild |
| 334 | o = o.shadow && o.lines || 0 |
| 335 | if (c && i+o < c.childNodes.length) { |
| 336 | c = c.childNodes[i+o]; c = c && c.firstChild; c = c && c.firstChild |
| 337 | if (c) c.opacity = val |
| 338 | } |
| 339 | } |
| 340 | } |
| 341 | |
| 342 | var probe = css(createEl('group'), {behavior: 'url(#default#VML)'}) |
| 343 | |
| 344 | if (!vendor(probe, 'transform') && probe.adj) initVML() |
| 345 | else useCssAnimations = vendor(probe, 'animation') |
| 346 | |
| 347 | return Spinner |
| 348 | |
| 349 | })); |
| 350 |