Team:UANL Mty-Mexico/holderjs

From 2013.igem.org

/*

Holder - 2.0 - client side image placeholders (c) 2012-2013 Ivan Malopinsky / http://imsky.co

Provided under the Apache 2.0 License: http://www.apache.org/licenses/LICENSE-2.0 Commercial use requires attribution.

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var Holder = Holder || {}; (function (app, win) {

var preempted = false, fallback = false, canvas = document.createElement('canvas');

//getElementsByClassName polyfill document.getElementsByClassName||(document.getElementsByClassName=function(e){var t=document,n,r,i,s=[];if(t.querySelectorAll)return t.querySelectorAll("."+e);if(t.evaluate){r=".//*[contains(concat(' ', @class, ' '), ' "+e+" ')]",n=t.evaluate(r,t,null,0,null);while(i=n.iterateNext())s.push(i)}else{n=t.getElementsByTagName("*"),r=new RegExp("(^|\\s)"+e+"(\\s|$)");for(i=0;i<n.length;i++)r.test(n[i].className)&&s.push(n[i])}return s})

//getComputedStyle polyfill window.getComputedStyle||(window.getComputedStyle=function(e,t){return this.el=e,this.getPropertyValue=function(t){var n=/(\-([a-z]){1})/g;return t=="float"&&(t="styleFloat"),n.test(t)&&(t=t.replace(n,function(){return arguments[2].toUpperCase()})),e.currentStyle[t]?e.currentStyle[t]:null},this})

//http://javascript.nwbox.com/ContentLoaded by Diego Perini with modifications function contentLoaded(n,t){var l="complete",s="readystatechange",u=!1,h=u,c=!0,i=n.document,a=i.documentElement,e=i.addEventListener?"addEventListener":"attachEvent",v=i.addEventListener?"removeEventListener":"detachEvent",f=i.addEventListener?"":"on",r=function(e){(e.type!=s||i.readyState==l)&&((e.type=="load"?n:i)[v](f+e.type,r,u),!h&&(h=!0)&&t.call(n,null))},o=function(){try{a.doScroll("left")}catch(n){setTimeout(o,50);return}r("poll")};if(i.readyState==l)t.call(n,"lazy");else{if(i.createEventObject&&a.doScroll){try{c=!n.frameElement}catch(y){}c&&o()}i[e](f+"DOMContentLoaded",r,u),i[e](f+s,r,u),n[e](f+"load",r,u)}};

//https://gist.github.com/991057 by Jed Schmidt with modifications function selector(a){ a=a.match(/^(\W)?(.*)/);var b=document["getElement"+(a[1]?a[1]=="#"?"ById":"sByClassName":"sByTagName")](a[2]); var ret=[]; b!=null&&(b.length?ret=b:b.length==0?ret=b:ret=[b]); return ret; }

//shallow object property extend function extend(a,b){var c={};for(var d in a)c[d]=a[d];for(var e in b)c[e]=b[e];return c}

//hasOwnProperty polyfill if (!Object.prototype.hasOwnProperty) Object.prototype.hasOwnProperty = function(prop) { var proto = this.__proto__ || this.constructor.prototype; return (prop in this) && (!(prop in proto) || proto[prop] !== this[prop]); }

function text_size(width, height, template) { height = parseInt(height,10); width = parseInt(width,10); var bigSide = Math.max(height, width) var smallSide = Math.min(height, width) var scale = 1 / 12; var newHeight = Math.min(smallSide * 0.75, 0.75 * bigSide * scale); return { height: Math.round(Math.max(template.size, newHeight)) } }

function draw(ctx, dimensions, template, ratio) { var ts = text_size(dimensions.width, dimensions.height, template); var text_height = ts.height; var width = dimensions.width * ratio, height = dimensions.height * ratio; var font = template.font ? template.font : "sans-serif"; canvas.width = width; canvas.height = height; ctx.textAlign = "center"; ctx.textBaseline = "middle"; ctx.fillStyle = template.background; ctx.fillRect(0, 0, width, height); ctx.fillStyle = template.foreground; ctx.font = "bold " + text_height + "px " + font; var text = template.text ? template.text : (Math.floor(dimensions.width) + "x" + Math.floor(dimensions.height)); var text_width = ctx.measureText(text).width; if (text_width / width >= 0.75) { text_height = Math.floor(text_height * 0.75 * (width/text_width)); } //Resetting font size if necessary ctx.font = "bold " + (text_height * ratio) + "px " + font; ctx.fillText(text, (width / 2), (height / 2), width); return canvas.toDataURL("image/png"); }

function render(mode, el, holder, src) { var dimensions = holder.dimensions, theme = holder.theme, text = holder.text ? decodeURIComponent(holder.text) : holder.text; var dimensions_caption = dimensions.width + "x" + dimensions.height; theme = (text ? extend(theme, { text: text }) : theme); theme = (holder.font ? extend(theme, { font: holder.font }) : theme); if (mode == "image") { el.setAttribute("data-src", src); el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption); if (fallback || !holder.auto) { el.style.width = dimensions.width + "px"; el.style.height = dimensions.height + "px"; } if (fallback) { el.style.backgroundColor = theme.background; } else { el.setAttribute("src", draw(ctx, dimensions, theme, ratio)); } } else if (mode == "background") { if (!fallback) { el.style.backgroundImage = "url(" + draw(ctx, dimensions, theme, ratio) + ")"; el.style.backgroundSize = dimensions.width + "px " + dimensions.height + "px"; } } else if (mode == "fluid") { el.setAttribute("data-src", src); el.setAttribute("alt", text ? text : theme.text ? theme.text + " [" + dimensions_caption + "]" : dimensions_caption); if (dimensions.height.substr(-1) == "%") { el.style.height = dimensions.height } else { el.style.height = dimensions.height + "px" } if (dimensions.width.substr(-1) == "%") { el.style.width = dimensions.width } else { el.style.width = dimensions.width + "px" } if (el.style.display == "inline" || el.style.display == "") { el.style.display = "block"; } if (fallback) { el.style.backgroundColor = theme.background; } else { el.holderData = holder; fluid_images.push(el); fluid_update(el); } } };

function fluid_update(element) { var images; if (element.nodeType == null) { images = fluid_images; } else { images = [element] } for (i in images) { var el = images[i] if (el.holderData) { var holder = el.holderData; el.setAttribute("src", draw(ctx, { height: el.clientHeight, width: el.clientWidth }, holder.theme, ratio)); } } }

function parse_flags(flags, options) {

var ret = { theme: settings.themes.gray }, render = false;

for (sl = flags.length, j = 0; j < sl; j++) { var flag = flags[j]; if (app.flags.dimensions.match(flag)) { render = true; ret.dimensions = app.flags.dimensions.output(flag); } else if (app.flags.fluid.match(flag)) { render = true; ret.dimensions = app.flags.fluid.output(flag); ret.fluid = true; } else if (app.flags.colors.match(flag)) { ret.theme = app.flags.colors.output(flag); } else if (options.themes[flag]) { //If a theme is specified, it will override custom colors ret.theme = options.themes[flag]; } else if (app.flags.text.match(flag)) { ret.text = app.flags.text.output(flag); } else if (app.flags.font.match(flag)) { ret.font = app.flags.font.output(flag); } else if (app.flags.auto.match(flag)) { ret.auto = true; } }

return render ? ret : false;

};


if (!canvas.getContext) { fallback = true; } else { if (canvas.toDataURL("image/png") .indexOf("data:image/png") < 0) { //Android doesn't support data URI fallback = true; } else { var ctx = canvas.getContext("2d"); } }

var dpr = 1, bsr = 1;

if(!fallback){

   dpr = window.devicePixelRatio || 1,
   bsr = ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1;

}

var ratio = dpr / bsr;

var fluid_images = [];

var settings = { domain: "holder.js", images: "img", bgnodes: ".holderjs", themes: { "gray": { background: "#eee", foreground: "#aaa", size: 12 }, "social": { background: "#3a5a97", foreground: "#fff", size: 12 }, "industrial": { background: "#434A52", foreground: "#C2F200", size: 12 } }, stylesheet: ".holderjs-fluid {font-size:16px;font-weight:bold;text-align:center;font-family:sans-serif;margin:0}" };


app.flags = { dimensions: { regex: /^(\d+)x(\d+)$/, output: function (val) { var exec = this.regex.exec(val); return { width: +exec[1], height: +exec[2] } } }, fluid: { regex: /^([0-9%]+)x([0-9%]+)$/, output: function (val) { var exec = this.regex.exec(val); return { width: exec[1], height: exec[2] } } }, colors: { regex: /#([0-9a-f]{3,})\:#([0-9a-f]{3,})/i, output: function (val) { var exec = this.regex.exec(val); return { size: settings.themes.gray.size, foreground: "#" + exec[2], background: "#" + exec[1] } } }, text: { regex: /text\:(.*)/, output: function (val) { return this.regex.exec(val)[1]; } }, font: { regex: /font\:(.*)/, output: function (val) { return this.regex.exec(val)[1]; } }, auto: { regex: /^auto$/ } }

for (var flag in app.flags) { if (!app.flags.hasOwnProperty(flag)) continue; app.flags[flag].match = function (val) { return val.match(this.regex) } }

app.add_theme = function (name, theme) { name != null && theme != null && (settings.themes[name] = theme); return app; };

app.add_image = function (src, el) { var node = selector(el); if (node.length) { for (var i = 0, l = node.length; i < l; i++) { var img = document.createElement("img") img.setAttribute("data-src", src); node[i].appendChild(img); } } return app; };

app.run = function (o) { var options = extend(settings, o), images = [], imageNodes = [], bgnodes = [];

if(typeof(options.images) == "string"){ imageNodes = selector(options.images); } else if (window.NodeList && options.images instanceof window.NodeList) { imageNodes = options.images; } else if (window.Node && options.images instanceof window.Node) { imageNodes = [options.images]; }

if(typeof(options.bgnodes) == "string"){ bgnodes = selector(options.bgnodes); } else if (window.NodeList && options.elements instanceof window.NodeList) { bgnodes = options.bgnodes; } else if (window.Node && options.bgnodes instanceof window.Node) { bgnodes = [options.bgnodes]; }

preempted = true;

for (i = 0, l = imageNodes.length; i < l; i++) images.push(imageNodes[i]);

var holdercss = document.getElementById("holderjs-style"); if (!holdercss) { holdercss = document.createElement("style"); holdercss.setAttribute("id", "holderjs-style"); holdercss.type = "text/css"; document.getElementsByTagName("head")[0].appendChild(holdercss); }

if (!options.nocss) { if (holdercss.styleSheet) { holdercss.styleSheet.cssText += options.stylesheet; } else { holdercss.appendChild(document.createTextNode(options.stylesheet)); } }

var cssregex = new RegExp(options.domain + "\/(.*?)\"?\\)");

for (var l = bgnodes.length, i = 0; i < l; i++) { var src = window.getComputedStyle(bgnodes[i], null) .getPropertyValue("background-image"); var flags = src.match(cssregex); var bgsrc = bgnodes[i].getAttribute("data-background-src");

if (flags) { var holder = parse_flags(flags[1].split("/"), options); if (holder) { render("background", bgnodes[i], holder, src); } } else if(bgsrc != null){ var holder = parse_flags(bgsrc.substr(bgsrc.lastIndexOf(options.domain) + options.domain.length + 1) .split("/"), options); if(holder){ render("background", bgnodes[i], holder, src); } } }

for (l = images.length, i = 0; i < l; i++) {

var attr_src = attr_data_src = src = null;

try{ attr_src = images[i].getAttribute("src"); attr_datasrc = images[i].getAttribute("data-src"); }catch(e){}

if (attr_datasrc == null && !! attr_src && attr_src.indexOf(options.domain) >= 0) { src = attr_src; } else if ( !! attr_datasrc && attr_datasrc.indexOf(options.domain) >= 0) { src = attr_datasrc; }

if (src) { var holder = parse_flags(src.substr(src.lastIndexOf(options.domain) + options.domain.length + 1) .split("/"), options); if (holder) { if (holder.fluid) { render("fluid", images[i], holder, src) } else { render("image", images[i], holder, src); } } } } return app; };

contentLoaded(win, function () { if (window.addEventListener) { window.addEventListener("resize", fluid_update, false); window.addEventListener("orientationchange", fluid_update, false); } else { window.attachEvent("onresize", fluid_update) } preempted || app.run(); });

if (typeof define === "function" && define.amd) { define("Holder", [], function () { return app; }); }

})(Holder, window);