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Diffstat (limited to 'plugins/jetpack/modules/carousel/spin.js')
| -rw-r--r-- | plugins/jetpack/modules/carousel/spin.js | 301 |
1 files changed, 301 insertions, 0 deletions
diff --git a/plugins/jetpack/modules/carousel/spin.js b/plugins/jetpack/modules/carousel/spin.js new file mode 100644 index 00000000..f506cd2b --- /dev/null +++ b/plugins/jetpack/modules/carousel/spin.js @@ -0,0 +1,301 @@ +//fgnass.github.com/spin.js#v1.2.4 +(function(window, document, undefined) { + +/** + * Copyright (c) 2011 Felix Gnass [fgnass at neteye dot de] + * Licensed under the MIT license + */ + + var prefixes = ['webkit', 'Moz', 'ms', 'O']; /* Vendor prefixes */ + var animations = {}; /* Animation rules keyed by their name */ + var useCssAnimations; + + /** + * 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'); + var 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'); + 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('-'); + var start = 0.01 + i/lines*100; + var z = Math.max(1-(1-alpha)/trail*(100-start) , alpha); + var prefix = useCssAnimations.substring(0, useCssAnimations.indexOf('Animation')).toLowerCase(); + var 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 + '}' + + '}', 0); + animations[name] = 1; + } + return name; + } + + /** + * Tries various vendor prefixes and returns the first supported property. + **/ + function vendor(el, prop) { + var s = el.style; + var pp; + var 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; + } + + 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 + color: '#000', // #rgb or #rrggbb + 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 + }; + + /** The constructor */ + var Spinner = function Spinner(o) { + if (!this.spin) return new Spinner(o); + this.opts = merge(o || {}, Spinner.defaults, defaults); + }; + + Spinner.defaults = {}; + Spinner.prototype = { + spin: function(target) { + this.stop(); + var self = this; + var o = self.opts; + var el = self.el = css(createEl(0, {className: o.className}), {position: 'relative', zIndex: o.zIndex}); + var mid = o.radius+o.length+o.width; + var ep; // element position + var 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) : o.left+mid) + 'px', + top: (o.top == 'auto' ? tp.y-ep.y + (target.offsetHeight >> 1) : o.top+mid) + 'px' + }); + } + + el.setAttribute('aria-role', 'progressbar'); + self.lines(el, self.opts); + + if (!useCssAnimations) { + // No CSS animation support, use setTimeout() instead + var i = 0; + var fps = o.fps; + var f = fps/o.speed; + var ostep = (1-o.opacity)/(f*o.trail / 100); + var astep = f/o.lines; + + !function anim() { + i++; + for (var s=o.lines; s; s--) { + var alpha = Math.max(1-(i+s*astep)%f * ostep, o.opacity); + self.opacity(el, o.lines-s, alpha, o); + } + self.timeout = self.el && setTimeout(anim, ~~(1000/fps)); + }(); + } + return self; + }, + stop: function() { + var el = this.el; + if (el) { + clearTimeout(this.timeout); + if (el.parentNode) el.parentNode.removeChild(el); + this.el = undefined; + } + return this; + }, + lines: function(el, o) { + var i = 0; + var 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) + 'deg) translate(' + o.radius+'px' +',0)', + borderRadius: (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, i, 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; + }, + opacity: function(el, i, val) { + if (i < el.childNodes.length) el.childNodes[i].style.opacity = val; + } + }; + + ///////////////////////////////////////////////////////////////////////// + // VML rendering for IE + ///////////////////////////////////////////////////////////////////////// + + /** + * Check and init VML support + */ + !function() { + var s = css(createEl('group'), {behavior: 'url(#default#VML)'}); + var i; + + if (!vendor(s, 'transform') && s.adj) { + + // VML support detected. Insert CSS rules ... + for (i=4; i--;) sheet.addRule(['group', 'roundrect', 'fill', 'stroke'][i], 'behavior:url(#default#VML)'); + + Spinner.prototype.lines = function(el, o) { + var r = o.length+o.width; + var s = 2*r; + + function grp() { + return css(createEl('group', {coordsize: s +' '+s, coordorigin: -r +' '+-r}), {width: s, height: s}); + } + + var margin = -(o.width+o.length)*2+'px'; + var g = css(grp(), {position: 'absolute', top: margin, left: margin}); + + var i; + + function seg(i, dx, filter) { + ins(g, + ins(css(grp(), {rotation: 360 / o.lines * i + 'deg', left: ~~dx}), + ins(css(createEl('roundrect', {arcsize: 1}), { + width: r, + height: o.width, + left: o.radius, + top: -o.width>>1, + filter: filter + }), + createEl('fill', {color: o.color, opacity: o.opacity}), + createEl('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; + } + }; + } + else { + useCssAnimations = vendor(s, 'animation'); + } + }(); + + window.Spinner = Spinner; + +})(window, document);
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