app/assets/javascripts/libs/spin.js
//fgnass.github.com/spin.js#v1.2.5
(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
rotate: 0, // rotation offset
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 = {};
merge(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+o.rotate) + '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() {
function vml(tag, attr) {
return createEl('<' + tag + ' xmlns="urn:schemas-microsoft.com:vml" class="spin-vml">', attr);
}
var s = css(createEl('group'), {behavior: 'url(#default#VML)'});
if (!vendor(s, 'transform') && s.adj) {
// VML support detected. Insert CSS rule ...
sheet.addRule('.spin-vml', 'behavior:url(#default#VML)');
Spinner.prototype.lines = function(el, o) {
var r = o.length+o.width;
var 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';
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(vml('roundrect', {arcsize: 1}), {
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;
}
};
}
else {
useCssAnimations = vendor(s, 'animation');
}
}();
window.Spinner = Spinner;
})(window, document);
$.fn.spin = function(opts) {
this.each(function() {
var $this = $(this),
data = $this.data();
if (data.spinner) {
data.spinner.stop();
delete data.spinner;
}
if (opts !== false) {
data.spinner = new Spinner($.extend({color: $this.css('color')}, opts)).spin(this);
}
});
return this;
};
window.iUPB.default_spinner_opts = {
lines: 11, // The number of lines to draw
length: 4, // The length of each line
width: 2, // The line thickness
radius: 3, // The radius of the inner circle
rotate: 0, // The rotation offset
color: '#999', // #rgb or #rrggbb
speed: 1, // Rounds per second
trail: 51, // Afterglow percentage
shadow: false, // Whether to render a shadow
hwaccel: true, // Whether to use hardware acceleration
className: 'spinner', // The CSS class to assign to the spinner
zIndex: 2e9, // The z-index (defaults to 2000000000)
top: 'auto', // Top position relative to parent in px
left: 'auto' // Left position relative to parent in px
};