mirror of
https://github.com/imsky/holder.git
synced 2026-04-21 03:01:19 -04:00
2022 lines
56 KiB
JavaScript
2022 lines
56 KiB
JavaScript
/*!
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Holder - client side image placeholders
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Version 2.5.0-pre+1ms4m
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© 2015 Ivan Malopinsky - http://imsky.co
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Site: http://imsky.github.io/holder
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Issues: https://github.com/imsky/holder/issues
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License: http://opensource.org/licenses/MIT
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*/
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/*!
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* onDomReady.js 1.4.0 (c) 2013 Tubal Martin - MIT license
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*
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* Specially modified to work with Holder.js
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*/
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;(function(name, global, callback){
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global[name] = callback;
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})("onDomReady", this,
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(function(win) {
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'use strict';
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//Lazy loading fix for Firefox < 3.6
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//http://webreflection.blogspot.com/2009/11/195-chars-to-help-lazy-loading.html
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if (document.readyState == null && document.addEventListener) {
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document.addEventListener("DOMContentLoaded", function DOMContentLoaded() {
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document.removeEventListener("DOMContentLoaded", DOMContentLoaded, false);
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document.readyState = "complete";
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}, false);
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document.readyState = "loading";
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}
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var doc = win.document,
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docElem = doc.documentElement,
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LOAD = "load",
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FALSE = false,
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ONLOAD = "on"+LOAD,
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COMPLETE = "complete",
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READYSTATE = "readyState",
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ATTACHEVENT = "attachEvent",
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DETACHEVENT = "detachEvent",
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ADDEVENTLISTENER = "addEventListener",
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DOMCONTENTLOADED = "DOMContentLoaded",
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ONREADYSTATECHANGE = "onreadystatechange",
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REMOVEEVENTLISTENER = "removeEventListener",
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// W3C Event model
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w3c = ADDEVENTLISTENER in doc,
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top = FALSE,
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// isReady: Is the DOM ready to be used? Set to true once it occurs.
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isReady = FALSE,
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// Callbacks pending execution until DOM is ready
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callbacks = [];
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// Handle when the DOM is ready
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function ready( fn ) {
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if ( !isReady ) {
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// Make sure body exists, at least, in case IE gets a little overzealous (ticket #5443).
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if ( !doc.body ) {
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return defer( ready );
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}
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// Remember that the DOM is ready
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isReady = true;
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// Execute all callbacks
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while ( fn = callbacks.shift() ) {
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defer( fn );
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}
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}
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}
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// The ready event handler
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function completed( event ) {
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// readyState === "complete" is good enough for us to call the dom ready in oldIE
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if ( w3c || event.type === LOAD || doc[READYSTATE] === COMPLETE ) {
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detach();
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ready();
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}
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}
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// Clean-up method for dom ready events
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function detach() {
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if ( w3c ) {
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doc[REMOVEEVENTLISTENER]( DOMCONTENTLOADED, completed, FALSE );
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win[REMOVEEVENTLISTENER]( LOAD, completed, FALSE );
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} else {
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doc[DETACHEVENT]( ONREADYSTATECHANGE, completed );
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win[DETACHEVENT]( ONLOAD, completed );
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}
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}
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// Defers a function, scheduling it to run after the current call stack has cleared.
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function defer( fn, wait ) {
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// Allow 0 to be passed
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setTimeout( fn, +wait >= 0 ? wait : 1 );
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}
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// Attach the listeners:
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// Catch cases where onDomReady is called after the browser event has already occurred.
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// we once tried to use readyState "interactive" here, but it caused issues like the one
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// discovered by ChrisS here: http://bugs.jquery.com/ticket/12282#comment:15
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if ( doc[READYSTATE] === COMPLETE ) {
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// Handle it asynchronously to allow scripts the opportunity to delay ready
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defer( ready );
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// Standards-based browsers support DOMContentLoaded
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} else if ( w3c ) {
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// Use the handy event callback
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doc[ADDEVENTLISTENER]( DOMCONTENTLOADED, completed, FALSE );
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// A fallback to window.onload, that will always work
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win[ADDEVENTLISTENER]( LOAD, completed, FALSE );
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// If IE event model is used
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} else {
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// Ensure firing before onload, maybe late but safe also for iframes
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doc[ATTACHEVENT]( ONREADYSTATECHANGE, completed );
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// A fallback to window.onload, that will always work
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win[ATTACHEVENT]( ONLOAD, completed );
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// If IE and not a frame
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// continually check to see if the document is ready
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try {
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top = win.frameElement == null && docElem;
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} catch(e) {}
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if ( top && top.doScroll ) {
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(function doScrollCheck() {
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if ( !isReady ) {
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try {
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// Use the trick by Diego Perini
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// http://javascript.nwbox.com/IEContentLoaded/
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top.doScroll("left");
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} catch(e) {
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return defer( doScrollCheck, 50 );
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}
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// detach all dom ready events
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detach();
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// and execute any waiting functions
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ready();
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}
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})();
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}
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}
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function onDomReady( fn ) {
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// If DOM is ready, execute the function (async), otherwise wait
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isReady ? defer( fn ) : callbacks.push( fn );
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}
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// Add version
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onDomReady.version = "1.4.0";
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// Add method to check if DOM is ready
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onDomReady.isReady = function(){
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return isReady;
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};
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return onDomReady;
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})(this));
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//https://github.com/inexorabletash/polyfill/blob/master/web.js
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if (!document.querySelectorAll) {
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document.querySelectorAll = function (selectors) {
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var style = document.createElement('style'), elements = [], element;
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document.documentElement.firstChild.appendChild(style);
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document._qsa = [];
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style.styleSheet.cssText = selectors + '{x-qsa:expression(document._qsa && document._qsa.push(this))}';
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window.scrollBy(0, 0);
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style.parentNode.removeChild(style);
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while (document._qsa.length) {
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element = document._qsa.shift();
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element.style.removeAttribute('x-qsa');
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elements.push(element);
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}
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document._qsa = null;
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return elements;
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};
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}
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if (!document.querySelector) {
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document.querySelector = function (selectors) {
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var elements = document.querySelectorAll(selectors);
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return (elements.length) ? elements[0] : null;
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};
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}
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if (!document.getElementsByClassName) {
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document.getElementsByClassName = function (classNames) {
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classNames = String(classNames).replace(/^|\s+/g, '.');
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return document.querySelectorAll(classNames);
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};
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}
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//https://github.com/inexorabletash/polyfill
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// ES5 15.2.3.14 Object.keys ( O )
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// https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/keys
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if (!Object.keys) {
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Object.keys = function (o) {
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if (o !== Object(o)) { throw TypeError('Object.keys called on non-object'); }
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var ret = [], p;
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for (p in o) {
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if (Object.prototype.hasOwnProperty.call(o, p)) {
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ret.push(p);
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}
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}
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return ret;
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};
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}
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//https://github.com/inexorabletash/polyfill/blob/master/web.js
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(function (global) {
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var B64_ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
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global.atob = global.atob || function (input) {
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input = String(input);
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var position = 0,
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output = [],
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buffer = 0, bits = 0, n;
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input = input.replace(/\s/g, '');
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if ((input.length % 4) === 0) { input = input.replace(/=+$/, ''); }
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if ((input.length % 4) === 1) { throw Error("InvalidCharacterError"); }
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if (/[^+/0-9A-Za-z]/.test(input)) { throw Error("InvalidCharacterError"); }
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while (position < input.length) {
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n = B64_ALPHABET.indexOf(input.charAt(position));
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buffer = (buffer << 6) | n;
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bits += 6;
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if (bits === 24) {
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output.push(String.fromCharCode((buffer >> 16) & 0xFF));
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output.push(String.fromCharCode((buffer >> 8) & 0xFF));
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output.push(String.fromCharCode(buffer & 0xFF));
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bits = 0;
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buffer = 0;
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}
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position += 1;
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}
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if (bits === 12) {
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buffer = buffer >> 4;
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output.push(String.fromCharCode(buffer & 0xFF));
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} else if (bits === 18) {
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buffer = buffer >> 2;
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output.push(String.fromCharCode((buffer >> 8) & 0xFF));
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output.push(String.fromCharCode(buffer & 0xFF));
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}
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return output.join('');
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};
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global.btoa = global.btoa || function (input) {
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input = String(input);
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var position = 0,
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out = [],
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o1, o2, o3,
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e1, e2, e3, e4;
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if (/[^\x00-\xFF]/.test(input)) { throw Error("InvalidCharacterError"); }
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while (position < input.length) {
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o1 = input.charCodeAt(position++);
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o2 = input.charCodeAt(position++);
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o3 = input.charCodeAt(position++);
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// 111111 112222 222233 333333
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e1 = o1 >> 2;
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e2 = ((o1 & 0x3) << 4) | (o2 >> 4);
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e3 = ((o2 & 0xf) << 2) | (o3 >> 6);
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e4 = o3 & 0x3f;
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if (position === input.length + 2) {
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e3 = 64; e4 = 64;
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}
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else if (position === input.length + 1) {
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e4 = 64;
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}
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out.push(B64_ALPHABET.charAt(e1),
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B64_ALPHABET.charAt(e2),
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B64_ALPHABET.charAt(e3),
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B64_ALPHABET.charAt(e4));
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}
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return out.join('');
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};
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}(this));
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//https://github.com/jonathantneal/polyfill/blob/master/source/Window.prototype.getComputedStyle.ie8.js
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(function () {
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if(window.getComputedStyle) return; //Add an exit if already defined
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function getComputedStylePixel(element, property, fontSize) {
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element.document; // Internet Explorer sometimes struggles to read currentStyle until the element's document is accessed.
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var
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value = element.currentStyle[property].match(/([\d\.]+)(%|cm|em|in|mm|pc|pt|)/) || [0, 0, ''],
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size = value[1],
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suffix = value[2],
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rootSize;
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fontSize = !fontSize ? fontSize : /%|em/.test(suffix) && element.parentElement ? getComputedStylePixel(element.parentElement, 'fontSize', null) : 16;
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rootSize = property == 'fontSize' ? fontSize : /width/i.test(property) ? element.clientWidth : element.clientHeight;
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return suffix == '%' ? size / 100 * rootSize :
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suffix == 'cm' ? size * 0.3937 * 96 :
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suffix == 'em' ? size * fontSize :
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suffix == 'in' ? size * 96 :
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suffix == 'mm' ? size * 0.3937 * 96 / 10 :
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suffix == 'pc' ? size * 12 * 96 / 72 :
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suffix == 'pt' ? size * 96 / 72 :
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size;
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}
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function setShortStyleProperty(style, property) {
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var
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borderSuffix = property == 'border' ? 'Width' : '',
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t = property + 'Top' + borderSuffix,
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r = property + 'Right' + borderSuffix,
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b = property + 'Bottom' + borderSuffix,
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l = property + 'Left' + borderSuffix;
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style[property] = (style[t] == style[r] && style[t] == style[b] && style[t] == style[l] ? [ style[t] ] :
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style[t] == style[b] && style[l] == style[r] ? [ style[t], style[r] ] :
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style[l] == style[r] ? [ style[t], style[r], style[b] ] :
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[ style[t], style[r], style[b], style[l] ]).join(' ');
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}
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// <CSSStyleDeclaration>
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function CSSStyleDeclaration(element) {
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var
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style = this,
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currentStyle = element.currentStyle,
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fontSize = getComputedStylePixel(element, 'fontSize'),
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unCamelCase = function (match) {
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return '-' + match.toLowerCase();
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},
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property;
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for (property in currentStyle) {
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Array.prototype.push.call(style, property == 'styleFloat' ? 'float' : property.replace(/[A-Z]/, unCamelCase));
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if (property == 'width') {
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style[property] = element.offsetWidth + 'px';
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} else if (property == 'height') {
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style[property] = element.offsetHeight + 'px';
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} else if (property == 'styleFloat') {
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style.float = currentStyle[property];
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} else if (/margin.|padding.|border.+W/.test(property) && style[property] != 'auto') {
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style[property] = Math.round(getComputedStylePixel(element, property, fontSize)) + 'px';
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} else if (/^outline/.test(property)) {
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// errors on checking outline
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try {
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style[property] = currentStyle[property];
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} catch (error) {
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style.outlineColor = currentStyle.color;
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style.outlineStyle = style.outlineStyle || 'none';
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style.outlineWidth = style.outlineWidth || '0px';
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style.outline = [style.outlineColor, style.outlineWidth, style.outlineStyle].join(' ');
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}
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} else {
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style[property] = currentStyle[property];
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}
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}
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setShortStyleProperty(style, 'margin');
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setShortStyleProperty(style, 'padding');
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setShortStyleProperty(style, 'border');
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style.fontSize = Math.round(fontSize) + 'px';
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}
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CSSStyleDeclaration.prototype = {
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constructor: CSSStyleDeclaration,
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// <CSSStyleDeclaration>.getPropertyPriority
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getPropertyPriority: function () {
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throw new Error('NotSupportedError: DOM Exception 9');
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},
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// <CSSStyleDeclaration>.getPropertyValue
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getPropertyValue: function(property) {
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var lookup = property.replace(/-([a-z])/g, function(match) {
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match = match.charAt ? match.split('') : match;
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return match[1].toUpperCase();
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});
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var ret = this[lookup];
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return ret;
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},
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// <CSSStyleDeclaration>.item
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item: function (index) {
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return this[index];
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},
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// <CSSStyleDeclaration>.removeProperty
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removeProperty: function () {
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throw new Error('NoModificationAllowedError: DOM Exception 7');
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},
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// <CSSStyleDeclaration>.setProperty
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setProperty: function () {
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throw new Error('NoModificationAllowedError: DOM Exception 7');
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},
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// <CSSStyleDeclaration>.getPropertyCSSValue
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getPropertyCSSValue: function () {
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throw new Error('NotSupportedError: DOM Exception 9');
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}
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};
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// <window>.getComputedStyle
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window.getComputedStyle = function (element) {
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return new CSSStyleDeclaration(element);
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};
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})();
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//https://gist.github.com/jimeh/332357
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if (!Object.prototype.hasOwnProperty){
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/*jshint -W001, -W103 */
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Object.prototype.hasOwnProperty = function(prop) {
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var proto = this.__proto__ || this.constructor.prototype;
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return (prop in this) && (!(prop in proto) || proto[prop] !== this[prop]);
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}
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/*jshint +W001, +W103 */
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}
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(function (global, factory) {
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global.augment = factory();
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}(this, function () {
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"use strict";
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var Factory = function () {};
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var slice = Array.prototype.slice;
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var augment = function (base, body) {
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var uber = Factory.prototype = typeof base === "function" ? base.prototype : base;
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var prototype = new Factory(), properties = body.apply(prototype, slice.call(arguments, 2).concat(uber));
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if (typeof properties === "object") for (var key in properties) prototype[key] = properties[key];
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if (!prototype.hasOwnProperty("constructor")) return prototype;
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var constructor = prototype.constructor;
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constructor.prototype = prototype;
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return constructor;
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};
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augment.defclass = function (prototype) {
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var constructor = prototype.constructor;
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constructor.prototype = prototype;
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return constructor;
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};
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augment.extend = function (base, body) {
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return augment(base, function (uber) {
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this.uber = uber;
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return body;
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});
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};
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return augment;
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}));
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|
|
/*
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Holder.js - client side image placeholders
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© 2012-2015 Ivan Malopinsky - http://imsky.co
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*/
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(function(register, global, undefined) {
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|
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//Constants and definitions
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|
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var SVG_NS = 'http://www.w3.org/2000/svg';
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var NODE_TYPE_COMMENT = 8;
|
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var document = global.document;
|
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var version = '2.5.0-pre';
|
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var generatorComment = '\n' +
|
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'Created with Holder.js ' + version + '.\n' +
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'Learn more at http://holderjs.com\n' +
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'(c) 2012-2015 Ivan Malopinsky - http://imsky.co\n';
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|
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var Holder = {
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/**
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|
* Adds a theme to default settings
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*
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* @param {string} name Theme name
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* @param {Object} theme Theme object, with foreground, background, size, font, and fontweight properties.
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*/
|
|
addTheme: function(name, theme) {
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name != null && theme != null && (App.settings.themes[name] = theme);
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delete App.vars.cache.themeKeys;
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return this;
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},
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|
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/**
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* Appends a placeholder to an element
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*
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* @param {string} src Placeholder URL string
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* @param {string} el Selector of target element(s)
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*/
|
|
addImage: function(src, el) {
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var node = document.querySelectorAll(el);
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if (node.length) {
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for (var i = 0, l = node.length; i < l; i++) {
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var img = newEl('img');
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setAttr(img, {
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'data-src': src
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});
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node[i].appendChild(img);
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}
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}
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return this;
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},
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/**
|
|
* Runs Holder with options. By default runs Holder on all images with "holder.js" in their source attributes.
|
|
*
|
|
* @param {Object} userOptions Options object, can contain domain, themes, images, and bgnodes properties
|
|
*/
|
|
run: function(userOptions) {
|
|
userOptions = userOptions || {};
|
|
var engineSettings = {};
|
|
|
|
App.vars.preempted = true;
|
|
|
|
var options = extend(App.settings, userOptions);
|
|
|
|
engineSettings.renderer = options.renderer ? options.renderer : App.setup.renderer;
|
|
if (App.setup.renderers.join(',').indexOf(engineSettings.renderer) === -1) {
|
|
engineSettings.renderer = App.setup.supportsSVG ? 'svg' : (App.setup.supportsCanvas ? 'canvas' : 'html');
|
|
}
|
|
|
|
var images = getNodeArray(options.images);
|
|
var bgnodes = getNodeArray(options.bgnodes);
|
|
var stylenodes = getNodeArray(options.stylenodes);
|
|
var objects = getNodeArray(options.objects);
|
|
|
|
engineSettings.stylesheets = [];
|
|
engineSettings.svgXMLStylesheet = true;
|
|
engineSettings.noFontFallback = options.noFontFallback ? options.noFontFallback : false;
|
|
|
|
for (var i = 0; i < stylenodes.length; i++) {
|
|
var styleNode = stylenodes[i];
|
|
if (styleNode.attributes.rel && styleNode.attributes.href && styleNode.attributes.rel.value == 'stylesheet') {
|
|
var href = styleNode.attributes.href.value;
|
|
//todo: write isomorphic relative-to-absolute URL function
|
|
var proxyLink = newEl('a');
|
|
proxyLink.href = href;
|
|
var stylesheetURL = proxyLink.protocol + '//' + proxyLink.host + proxyLink.pathname + proxyLink.search;
|
|
engineSettings.stylesheets.push(stylesheetURL);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < bgnodes.length; i++) {
|
|
var backgroundImage = global.getComputedStyle(bgnodes[i], null).getPropertyValue('background-image');
|
|
var dataBackgroundImage = bgnodes[i].getAttribute('data-background-src');
|
|
var rawURL = null;
|
|
|
|
if (dataBackgroundImage == null) {
|
|
rawURL = backgroundImage;
|
|
} else {
|
|
rawURL = dataBackgroundImage;
|
|
}
|
|
|
|
var holderURL = null;
|
|
var holderString = '?' + options.domain + '/';
|
|
|
|
if (rawURL.indexOf(holderString) === 0) {
|
|
holderURL = rawURL.slice(1);
|
|
} else if (rawURL.indexOf(holderString) != -1) {
|
|
var fragment = rawURL.substr(rawURL.indexOf(holderString)).slice(1);
|
|
var fragmentMatch = fragment.match(/([^\"]*)"?\)/);
|
|
|
|
if (fragmentMatch != null) {
|
|
holderURL = fragmentMatch[1];
|
|
}
|
|
}
|
|
|
|
if (holderURL != null) {
|
|
var holderFlags = parseURL(holderURL, options);
|
|
if (holderFlags) {
|
|
prepareDOMElement({
|
|
mode:'background',
|
|
el: bgnodes[i],
|
|
flags: holderFlags,
|
|
engineSettings: engineSettings
|
|
});
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < objects.length; i++) {
|
|
var object = objects[i];
|
|
var objectAttr = {};
|
|
|
|
try {
|
|
objectAttr.data = object.getAttribute('data');
|
|
objectAttr.dataSrc = object.getAttribute('data-src');
|
|
} catch (e) {}
|
|
|
|
var objectHasSrcURL = objectAttr.data != null && objectAttr.data.indexOf(options.domain) === 0;
|
|
var objectHasDataSrcURL = objectAttr.dataSrc != null && objectAttr.dataSrc.indexOf(options.domain) === 0;
|
|
|
|
if (objectHasSrcURL) {
|
|
prepareImageElement(options, engineSettings, objectAttr.data, object);
|
|
} else if (objectHasDataSrcURL) {
|
|
prepareImageElement(options, engineSettings, objectAttr.dataSrc, object);
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < images.length; i++) {
|
|
var image = images[i];
|
|
var imageAttr = {};
|
|
|
|
try {
|
|
imageAttr.src = image.getAttribute('src');
|
|
imageAttr.dataSrc = image.getAttribute('data-src');
|
|
imageAttr.rendered = image.getAttribute('data-holder-rendered');
|
|
} catch (e) {}
|
|
|
|
var imageHasSrc = imageAttr.src != null;
|
|
var imageHasDataSrcURL = imageAttr.dataSrc != null && imageAttr.dataSrc.indexOf(options.domain) === 0;
|
|
var imageRendered = imageAttr.rendered != null && imageAttr.rendered == 'true';
|
|
|
|
if (imageHasSrc) {
|
|
if (imageAttr.src.indexOf(options.domain) === 0) {
|
|
prepareImageElement(options, engineSettings, imageAttr.src, image);
|
|
} else if (imageHasDataSrcURL) {
|
|
//Image has a valid data-src and an invalid src
|
|
if (imageRendered) {
|
|
//If the placeholder has already been render, re-render it
|
|
prepareImageElement(options, engineSettings, imageAttr.dataSrc, image);
|
|
} else {
|
|
//If the placeholder has not been rendered, check if the image exists and render a fallback if it doesn't
|
|
(function(src, options, engineSettings, dataSrc, image){
|
|
imageExists(src, function(exists){
|
|
if(!exists){
|
|
prepareImageElement(options, engineSettings, dataSrc, image);
|
|
}
|
|
});
|
|
})(imageAttr.src, options, engineSettings, imageAttr.dataSrc, image);
|
|
}
|
|
}
|
|
} else if (imageHasDataSrcURL) {
|
|
prepareImageElement(options, engineSettings, imageAttr.dataSrc, image);
|
|
}
|
|
}
|
|
|
|
return this;
|
|
},
|
|
//todo: remove invisibleErrorFn for 2.5
|
|
invisibleErrorFn: function(fn) {
|
|
return function(el) {
|
|
if (el.hasAttribute('data-holder-invisible')) {
|
|
throw 'Holder: invisible placeholder';
|
|
}
|
|
};
|
|
},
|
|
version: version
|
|
};
|
|
|
|
var App = {
|
|
settings: {
|
|
domain: 'holder.js',
|
|
images: 'img',
|
|
objects: 'object',
|
|
bgnodes: 'body .holderjs',
|
|
stylenodes: 'head link.holderjs',
|
|
stylesheets: [],
|
|
themes: {
|
|
'gray': {
|
|
background: '#EEEEEE',
|
|
foreground: '#AAAAAA'
|
|
},
|
|
'social': {
|
|
background: '#3a5a97',
|
|
foreground: '#FFFFFF'
|
|
},
|
|
'industrial': {
|
|
background: '#434A52',
|
|
foreground: '#C2F200'
|
|
},
|
|
'sky': {
|
|
background: '#0D8FDB',
|
|
foreground: '#FFFFFF'
|
|
},
|
|
'vine': {
|
|
background: '#39DBAC',
|
|
foreground: '#1E292C'
|
|
},
|
|
'lava': {
|
|
background: '#F8591A',
|
|
foreground: '#1C2846'
|
|
}
|
|
}
|
|
},
|
|
defaults: {
|
|
size: 10,
|
|
units: 'pt',
|
|
scale: 1 / 16
|
|
},
|
|
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 {
|
|
foreground: '#' + exec[2],
|
|
background: '#' + exec[1]
|
|
};
|
|
}
|
|
},
|
|
text: {
|
|
regex: /text\:(.*)/,
|
|
output: function(val) {
|
|
return this.regex.exec(val)[1].replace('\\/', '/');
|
|
}
|
|
},
|
|
font: {
|
|
regex: /font\:(.*)/,
|
|
output: function(val) {
|
|
return this.regex.exec(val)[1];
|
|
}
|
|
},
|
|
auto: {
|
|
regex: /^auto$/
|
|
},
|
|
textmode: {
|
|
regex: /textmode\:(.*)/,
|
|
output: function(val) {
|
|
return this.regex.exec(val)[1];
|
|
}
|
|
},
|
|
random: {
|
|
regex: /^random$/
|
|
}
|
|
}
|
|
};
|
|
|
|
/**
|
|
* Processes provided source attribute and sets up the appropriate rendering workflow
|
|
*
|
|
* @private
|
|
* @param options Instance options from Holder.run
|
|
* @param renderSettings Instance configuration
|
|
* @param src Image URL
|
|
* @param el Image DOM element
|
|
*/
|
|
function prepareImageElement(options, engineSettings, src, el) {
|
|
var holderFlags = parseURL(src.substr(src.lastIndexOf(options.domain)), options);
|
|
if (holderFlags) {
|
|
prepareDOMElement({
|
|
mode: null,
|
|
el: el,
|
|
flags: holderFlags,
|
|
engineSettings: engineSettings
|
|
});
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Processes a Holder URL and extracts flags
|
|
*
|
|
* @private
|
|
* @param url URL
|
|
* @param options Instance options from Holder.run
|
|
*/
|
|
function parseURL(url, options) {
|
|
var ret = {
|
|
theme: extend(App.settings.themes.gray, null),
|
|
stylesheets: options.stylesheets,
|
|
holderURL: []
|
|
};
|
|
var render = false;
|
|
var vtab = String.fromCharCode(11);
|
|
var flags = url.replace(/([^\\])\//g, '$1' + vtab).split(vtab);
|
|
var uriRegex = /%[0-9a-f]{2}/gi;
|
|
for (var fl = flags.length, j = 0; j < fl; j++) {
|
|
var flag = flags[j];
|
|
if (flag.match(uriRegex)) {
|
|
try {
|
|
flag = decodeURIComponent(flag);
|
|
} catch (e) {
|
|
flag = flags[j];
|
|
}
|
|
}
|
|
|
|
var push = false;
|
|
|
|
if (App.flags.dimensions.match(flag)) {
|
|
render = true;
|
|
ret.dimensions = App.flags.dimensions.output(flag);
|
|
push = true;
|
|
} else if (App.flags.fluid.match(flag)) {
|
|
render = true;
|
|
ret.dimensions = App.flags.fluid.output(flag);
|
|
ret.fluid = true;
|
|
push = true;
|
|
} else if (App.flags.textmode.match(flag)) {
|
|
ret.textmode = App.flags.textmode.output(flag);
|
|
push = true;
|
|
} else if (App.flags.colors.match(flag)) {
|
|
var colors = App.flags.colors.output(flag);
|
|
ret.theme = extend(ret.theme, colors);
|
|
//todo: convert implicit theme use to a theme: flag
|
|
push = true;
|
|
} else if (options.themes[flag]) {
|
|
//If a theme is specified, it will override custom colors
|
|
if (options.themes.hasOwnProperty(flag)) {
|
|
ret.theme = extend(options.themes[flag], null);
|
|
}
|
|
push = true;
|
|
} else if (App.flags.font.match(flag)) {
|
|
ret.font = App.flags.font.output(flag);
|
|
push = true;
|
|
} else if (App.flags.auto.match(flag)) {
|
|
ret.auto = true;
|
|
push = true;
|
|
} else if (App.flags.text.match(flag)) {
|
|
ret.text = App.flags.text.output(flag);
|
|
push = true;
|
|
} else if (App.flags.random.match(flag)) {
|
|
if (App.vars.cache.themeKeys == null) {
|
|
App.vars.cache.themeKeys = Object.keys(options.themes);
|
|
}
|
|
var theme = App.vars.cache.themeKeys[0 | Math.random() * App.vars.cache.themeKeys.length];
|
|
ret.theme = extend(options.themes[theme], null);
|
|
push = true;
|
|
}
|
|
|
|
if (push) {
|
|
ret.holderURL.push(flag);
|
|
}
|
|
}
|
|
ret.holderURL.unshift(options.domain);
|
|
ret.holderURL = ret.holderURL.join('/');
|
|
return render ? ret : false;
|
|
}
|
|
|
|
/**
|
|
* Modifies the DOM to fit placeholders and sets up resizable image callbacks (for fluid and automatically sized placeholders)
|
|
*
|
|
* @private
|
|
* @param settings DOM prep settings
|
|
*/
|
|
function prepareDOMElement(prepSettings) {
|
|
var mode = prepSettings.mode;
|
|
var el = prepSettings.el;
|
|
var flags = prepSettings.flags;
|
|
var _engineSettings = prepSettings.engineSettings;
|
|
var dimensions = flags.dimensions,
|
|
theme = flags.theme;
|
|
var dimensionsCaption = dimensions.width + 'x' + dimensions.height;
|
|
mode = mode == null ? (flags.fluid ? 'fluid' : 'image') : mode;
|
|
|
|
if (flags.text != null) {
|
|
theme.text = flags.text;
|
|
|
|
//<object> SVG embedding doesn't parse Unicode properly
|
|
if (el.nodeName.toLowerCase() === 'object') {
|
|
var textLines = theme.text.split('\\n');
|
|
for (var k = 0; k < textLines.length; k++) {
|
|
textLines[k] = encodeHtmlEntity(textLines[k]);
|
|
}
|
|
theme.text = textLines.join('\\n');
|
|
}
|
|
}
|
|
|
|
var holderURL = flags.holderURL;
|
|
var engineSettings = extend(_engineSettings, null);
|
|
|
|
if (flags.font) {
|
|
theme.font = flags.font;
|
|
//Only run the <canvas> webfont fallback if noFontFallback is false, if the node is not an image, and if canvas is supported
|
|
if (!engineSettings.noFontFallback && el.nodeName.toLowerCase() === 'img' && App.setup.supportsCanvas && engineSettings.renderer === 'svg') {
|
|
engineSettings = extend(engineSettings, {
|
|
renderer: 'canvas'
|
|
});
|
|
}
|
|
}
|
|
|
|
//Chrome and Opera require a quick 10ms re-render if web fonts are used with canvas
|
|
if (flags.font && engineSettings.renderer == 'canvas') {
|
|
engineSettings.reRender = true;
|
|
}
|
|
|
|
if (mode == 'background') {
|
|
if (el.getAttribute('data-background-src') == null) {
|
|
setAttr(el, {
|
|
'data-background-src': holderURL
|
|
});
|
|
}
|
|
} else {
|
|
setAttr(el, {
|
|
'data-src': holderURL
|
|
});
|
|
}
|
|
|
|
flags.theme = theme;
|
|
|
|
el.holderData = {
|
|
flags: flags,
|
|
engineSettings: engineSettings
|
|
};
|
|
|
|
if (mode == 'image' || mode == 'fluid') {
|
|
setAttr(el, {
|
|
'alt': (theme.text ? theme.text + ' [' + dimensionsCaption + ']' : dimensionsCaption)
|
|
});
|
|
}
|
|
|
|
var settings = {
|
|
mode: mode,
|
|
params: {
|
|
dimensions: dimensions,
|
|
theme: theme,
|
|
flags: flags
|
|
},
|
|
el: el,
|
|
engineSettings: engineSettings
|
|
};
|
|
|
|
if (mode == 'image') {
|
|
if (engineSettings.renderer == 'html' || !flags.auto) {
|
|
el.style.width = dimensions.width + 'px';
|
|
el.style.height = dimensions.height + 'px';
|
|
}
|
|
if (engineSettings.renderer == 'html') {
|
|
el.style.backgroundColor = theme.background;
|
|
} else {
|
|
render(settings);
|
|
|
|
if (flags.textmode && flags.textmode == 'exact') {
|
|
App.vars.resizableImages.push(el);
|
|
updateResizableElements(el);
|
|
}
|
|
}
|
|
} else if (mode == 'background' && engineSettings.renderer != 'html') {
|
|
render(settings);
|
|
} else if (mode == 'fluid') {
|
|
if (dimensions.height.slice(-1) == '%') {
|
|
el.style.height = dimensions.height;
|
|
} else if (flags.auto == null || !flags.auto) {
|
|
el.style.height = dimensions.height + 'px';
|
|
}
|
|
if (dimensions.width.slice(-1) == '%') {
|
|
el.style.width = dimensions.width;
|
|
} else if (flags.auto == null || !flags.auto) {
|
|
el.style.width = dimensions.width + 'px';
|
|
}
|
|
if (el.style.display == 'inline' || el.style.display === '' || el.style.display == 'none') {
|
|
el.style.display = 'block';
|
|
}
|
|
|
|
setInitialDimensions(el);
|
|
|
|
if (engineSettings.renderer == 'html') {
|
|
el.style.backgroundColor = theme.background;
|
|
} else {
|
|
App.vars.resizableImages.push(el);
|
|
updateResizableElements(el);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Core function that takes output from renderers and sets it as the source or background-image of the target element
|
|
*
|
|
* @private
|
|
* @param renderSettings Renderer settings
|
|
*/
|
|
function render(renderSettings) {
|
|
var image = null;
|
|
var mode = renderSettings.mode;
|
|
//todo rename params
|
|
var params = renderSettings.params;
|
|
//todo rename el
|
|
var el = renderSettings.el;
|
|
//todo rename renderSettings!
|
|
var engineSettings = renderSettings.engineSettings;
|
|
|
|
switch (engineSettings.renderer) {
|
|
case 'svg':
|
|
if (!App.setup.supportsSVG) return;
|
|
break;
|
|
case 'canvas':
|
|
if (!App.setup.supportsCanvas) return;
|
|
break;
|
|
default:
|
|
return;
|
|
}
|
|
|
|
//todo: move generation of scene up to flag generation to reduce extra object creation
|
|
var scene = {
|
|
width: params.dimensions.width,
|
|
height: params.dimensions.height,
|
|
theme: params.theme,
|
|
flags: params.flags
|
|
};
|
|
|
|
var sceneGraph = buildSceneGraph(scene);
|
|
|
|
function getRenderedImage() {
|
|
var image = null;
|
|
switch (engineSettings.renderer) {
|
|
case 'canvas':
|
|
image = sgCanvasRenderer(sceneGraph, renderSettings);
|
|
break;
|
|
case 'svg':
|
|
image = sgSVGRenderer(sceneGraph, renderSettings);
|
|
break;
|
|
default:
|
|
throw 'Holder: invalid renderer: ' + engineSettings.renderer;
|
|
}
|
|
return image;
|
|
}
|
|
|
|
image = getRenderedImage();
|
|
|
|
if (image == null) {
|
|
throw 'Holder: couldn\'t render placeholder';
|
|
}
|
|
|
|
//todo: add <object> canvas rendering
|
|
if (mode == 'background') {
|
|
el.style.backgroundImage = 'url(' + image + ')';
|
|
el.style.backgroundSize = scene.width + 'px ' + scene.height + 'px';
|
|
} else {
|
|
if (el.nodeName.toLowerCase() === 'img') {
|
|
setAttr(el, {
|
|
'src': image
|
|
});
|
|
} else if (el.nodeName.toLowerCase() === 'object') {
|
|
setAttr(el, {
|
|
'data': image
|
|
});
|
|
setAttr(el, {
|
|
'type': 'image/svg+xml'
|
|
});
|
|
}
|
|
if (engineSettings.reRender) {
|
|
setTimeout(function() {
|
|
var image = getRenderedImage();
|
|
if (image == null) {
|
|
throw 'Holder: couldn\'t render placeholder';
|
|
}
|
|
if (el.nodeName.toLowerCase() === 'img') {
|
|
setAttr(el, {
|
|
'src': image
|
|
});
|
|
} else if (el.nodeName.toLowerCase() === 'object') {
|
|
setAttr(el, {
|
|
'data': image
|
|
});
|
|
setAttr(el, {
|
|
'type': 'image/svg+xml'
|
|
});
|
|
}
|
|
}, 100);
|
|
}
|
|
}
|
|
setAttr(el, {
|
|
'data-holder-rendered': true
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Core function that takes a Holder scene description and builds a scene graph
|
|
*
|
|
* @private
|
|
* @param scene Holder scene object
|
|
*/
|
|
function buildSceneGraph(scene) {
|
|
scene.font = {
|
|
family: scene.theme.font ? scene.theme.font : 'Arial, Helvetica, Open Sans, sans-serif',
|
|
size: textSize(scene.width, scene.height, scene.theme.size ? scene.theme.size : App.defaults.size),
|
|
units: scene.theme.units ? scene.theme.units : App.defaults.units,
|
|
weight: scene.theme.fontweight ? scene.theme.fontweight : 'bold'
|
|
};
|
|
scene.text = scene.theme.text ? scene.theme.text : Math.floor(scene.width) + 'x' + Math.floor(scene.height);
|
|
|
|
switch (scene.flags.textmode) {
|
|
case 'literal':
|
|
scene.text = scene.flags.dimensions.width + 'x' + scene.flags.dimensions.height;
|
|
break;
|
|
case 'exact':
|
|
if (!scene.flags.exactDimensions) break;
|
|
scene.text = Math.floor(scene.flags.exactDimensions.width) + 'x' + Math.floor(scene.flags.exactDimensions.height);
|
|
break;
|
|
}
|
|
|
|
var sceneGraph = new SceneGraph({
|
|
width: scene.width,
|
|
height: scene.height
|
|
});
|
|
|
|
var Shape = sceneGraph.Shape;
|
|
|
|
var holderBg = new Shape.Rect('holderBg', {
|
|
fill: scene.theme.background
|
|
});
|
|
|
|
holderBg.resize(scene.width, scene.height);
|
|
sceneGraph.root.add(holderBg);
|
|
|
|
var holderTextGroup = new Shape.Group('holderTextGroup', {
|
|
text: scene.text,
|
|
align: 'center',
|
|
font: scene.font,
|
|
fill: scene.theme.foreground
|
|
});
|
|
|
|
holderTextGroup.moveTo(null, null, 1);
|
|
sceneGraph.root.add(holderTextGroup);
|
|
|
|
var tpdata = holderTextGroup.textPositionData = stagingRenderer(sceneGraph);
|
|
if (!tpdata) {
|
|
throw 'Holder: staging fallback not supported yet.';
|
|
}
|
|
holderTextGroup.properties.leading = tpdata.boundingBox.height;
|
|
|
|
//todo: alignment: TL, TC, TR, CL, CR, BL, BC, BR
|
|
var textNode = null;
|
|
var line = null;
|
|
|
|
function finalizeLine(parent, line, width, height) {
|
|
line.width = width;
|
|
line.height = height;
|
|
parent.width = Math.max(parent.width, line.width);
|
|
parent.height += line.height;
|
|
parent.add(line);
|
|
}
|
|
|
|
if (tpdata.lineCount > 1) {
|
|
var offsetX = 0;
|
|
var offsetY = 0;
|
|
var maxLineWidth = scene.width * App.setup.lineWrapRatio;
|
|
var lineIndex = 0;
|
|
line = new Shape.Group('line' + lineIndex);
|
|
|
|
for (var i = 0; i < tpdata.words.length; i++) {
|
|
var word = tpdata.words[i];
|
|
textNode = new Shape.Text(word.text);
|
|
var newline = word.text == '\\n';
|
|
if (offsetX + word.width >= maxLineWidth || newline === true) {
|
|
finalizeLine(holderTextGroup, line, offsetX, holderTextGroup.properties.leading);
|
|
offsetX = 0;
|
|
offsetY += holderTextGroup.properties.leading;
|
|
lineIndex += 1;
|
|
line = new Shape.Group('line' + lineIndex);
|
|
line.y = offsetY;
|
|
}
|
|
if (newline === true) {
|
|
continue;
|
|
}
|
|
textNode.moveTo(offsetX, 0);
|
|
offsetX += tpdata.spaceWidth + word.width;
|
|
line.add(textNode);
|
|
}
|
|
|
|
finalizeLine(holderTextGroup, line, offsetX, holderTextGroup.properties.leading);
|
|
|
|
for (var lineKey in holderTextGroup.children) {
|
|
line = holderTextGroup.children[lineKey];
|
|
line.moveTo(
|
|
(holderTextGroup.width - line.width) / 2,
|
|
null,
|
|
null);
|
|
}
|
|
|
|
holderTextGroup.moveTo(
|
|
(scene.width - holderTextGroup.width) / 2, (scene.height - holderTextGroup.height) / 2,
|
|
null);
|
|
|
|
//If the text exceeds vertical space, move it down so the first line is visible
|
|
if ((scene.height - holderTextGroup.height) / 2 < 0) {
|
|
holderTextGroup.moveTo(null, 0, null);
|
|
}
|
|
} else {
|
|
textNode = new Shape.Text(scene.text);
|
|
line = new Shape.Group('line0');
|
|
line.add(textNode);
|
|
holderTextGroup.add(line);
|
|
|
|
holderTextGroup.moveTo(
|
|
(scene.width - tpdata.boundingBox.width) / 2, (scene.height - tpdata.boundingBox.height) / 2,
|
|
null);
|
|
}
|
|
|
|
//todo: renderlist
|
|
|
|
return sceneGraph;
|
|
}
|
|
|
|
/**
|
|
* Adaptive text sizing function
|
|
*
|
|
* @private
|
|
* @param width Parent width
|
|
* @param height Parent height
|
|
* @param fontSize Requested text size
|
|
*/
|
|
function textSize(width, height, fontSize) {
|
|
height = parseInt(height, 10);
|
|
width = parseInt(width, 10);
|
|
var bigSide = Math.max(height, width);
|
|
var smallSide = Math.min(height, width);
|
|
var scale = App.defaults.scale;
|
|
var newHeight = Math.min(smallSide * 0.75, 0.75 * bigSide * scale);
|
|
return Math.round(Math.max(fontSize, newHeight));
|
|
}
|
|
|
|
/**
|
|
* Iterates over resizable (fluid or auto) placeholders and renders them
|
|
*
|
|
* @private
|
|
* @param element Optional element selector, specified only if a specific element needs to be re-rendered
|
|
*/
|
|
function updateResizableElements(element) {
|
|
var images;
|
|
if (element == null || element.nodeType == null) {
|
|
images = App.vars.resizableImages;
|
|
} else {
|
|
images = [element];
|
|
}
|
|
for (var i in images) {
|
|
if (!images.hasOwnProperty(i)) {
|
|
continue;
|
|
}
|
|
var el = images[i];
|
|
if (el.holderData) {
|
|
var flags = el.holderData.flags;
|
|
var dimensions = dimensionCheck(el, Holder.invisibleErrorFn(updateResizableElements));
|
|
if (dimensions) {
|
|
if (flags.fluid && flags.auto) {
|
|
var fluidConfig = el.holderData.fluidConfig;
|
|
switch (fluidConfig.mode) {
|
|
case 'width':
|
|
dimensions.height = dimensions.width / fluidConfig.ratio;
|
|
break;
|
|
case 'height':
|
|
dimensions.width = dimensions.height * fluidConfig.ratio;
|
|
break;
|
|
}
|
|
}
|
|
|
|
var settings = {
|
|
mode: 'image',
|
|
params: {
|
|
dimensions: dimensions,
|
|
theme: flags.theme,
|
|
flags: flags
|
|
},
|
|
el: el,
|
|
engineSettings: el.holderData.engineSettings
|
|
};
|
|
|
|
if (flags.textmode && flags.textmode == 'exact') {
|
|
flags.exactDimensions = dimensions;
|
|
settings.params.dimensions = flags.dimensions;
|
|
}
|
|
|
|
render(settings);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Checks if an element is visible
|
|
*
|
|
* @private
|
|
* @param el DOM element
|
|
* @param callback Callback function executed if the element is invisible
|
|
*/
|
|
function dimensionCheck(el, callback) {
|
|
var dimensions = {
|
|
height: el.clientHeight,
|
|
width: el.clientWidth
|
|
};
|
|
if (!dimensions.height && !dimensions.width) {
|
|
setAttr(el, {
|
|
'data-holder-invisible': true
|
|
});
|
|
callback.call(this, el);
|
|
} else {
|
|
el.removeAttribute('data-holder-invisible');
|
|
return dimensions;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sets up aspect ratio metadata for fluid placeholders, in order to preserve proportions when resizing
|
|
*
|
|
* @private
|
|
* @param el Image DOM element
|
|
*/
|
|
function setInitialDimensions(el) {
|
|
if (el.holderData) {
|
|
var dimensions = dimensionCheck(el, Holder.invisibleErrorFn(setInitialDimensions));
|
|
if (dimensions) {
|
|
var flags = el.holderData.flags;
|
|
|
|
var fluidConfig = {
|
|
fluidHeight: flags.dimensions.height.slice(-1) == '%',
|
|
fluidWidth: flags.dimensions.width.slice(-1) == '%',
|
|
mode: null,
|
|
initialDimensions: dimensions
|
|
};
|
|
|
|
if (fluidConfig.fluidWidth && !fluidConfig.fluidHeight) {
|
|
fluidConfig.mode = 'width';
|
|
fluidConfig.ratio = fluidConfig.initialDimensions.width / parseFloat(flags.dimensions.height);
|
|
} else if (!fluidConfig.fluidWidth && fluidConfig.fluidHeight) {
|
|
fluidConfig.mode = 'height';
|
|
fluidConfig.ratio = parseFloat(flags.dimensions.width) / fluidConfig.initialDimensions.height;
|
|
}
|
|
|
|
el.holderData.fluidConfig = fluidConfig;
|
|
}
|
|
}
|
|
}
|
|
|
|
//todo: see if possible to convert stagingRenderer to use HTML only
|
|
var stagingRenderer = (function() {
|
|
var svg = null,
|
|
stagingText = null,
|
|
stagingTextNode = null;
|
|
return function(graph) {
|
|
var rootNode = graph.root;
|
|
if (App.setup.supportsSVG) {
|
|
var firstTimeSetup = false;
|
|
var tnode = function(text) {
|
|
return document.createTextNode(text);
|
|
};
|
|
if (svg == null || svg.parentNode !== document.body) {
|
|
firstTimeSetup = true;
|
|
}
|
|
|
|
svg = initSVG(svg, rootNode.properties.width, rootNode.properties.height);
|
|
//Show staging element before staging
|
|
svg.style.display = 'block';
|
|
|
|
if (firstTimeSetup) {
|
|
stagingText = newEl('text', SVG_NS);
|
|
stagingTextNode = tnode(null);
|
|
setAttr(stagingText, {
|
|
x: 0
|
|
});
|
|
stagingText.appendChild(stagingTextNode);
|
|
svg.appendChild(stagingText);
|
|
document.body.appendChild(svg);
|
|
svg.style.visibility = 'hidden';
|
|
svg.style.position = 'absolute';
|
|
svg.style.top = '-100%';
|
|
svg.style.left = '-100%';
|
|
//todo: workaround for zero-dimension <svg> tag in Opera 12
|
|
//svg.setAttribute('width', 0);
|
|
//svg.setAttribute('height', 0);
|
|
}
|
|
|
|
var holderTextGroup = rootNode.children.holderTextGroup;
|
|
var htgProps = holderTextGroup.properties;
|
|
setAttr(stagingText, {
|
|
'y': htgProps.font.size,
|
|
'style': cssProps({
|
|
'font-weight': htgProps.font.weight,
|
|
'font-size': htgProps.font.size + htgProps.font.units,
|
|
'font-family': htgProps.font.family,
|
|
'dominant-baseline': 'middle'
|
|
})
|
|
});
|
|
|
|
//Get bounding box for the whole string (total width and height)
|
|
stagingTextNode.nodeValue = htgProps.text;
|
|
var stagingTextBBox = stagingText.getBBox();
|
|
|
|
//Get line count and split the string into words
|
|
var lineCount = Math.ceil(stagingTextBBox.width / (rootNode.properties.width * App.setup.lineWrapRatio));
|
|
var words = htgProps.text.split(' ');
|
|
var newlines = htgProps.text.match(/\\n/g);
|
|
lineCount += newlines == null ? 0 : newlines.length;
|
|
|
|
//Get bounding box for the string with spaces removed
|
|
stagingTextNode.nodeValue = htgProps.text.replace(/[ ]+/g, '');
|
|
var computedNoSpaceLength = stagingText.getComputedTextLength();
|
|
|
|
//Compute average space width
|
|
var diffLength = stagingTextBBox.width - computedNoSpaceLength;
|
|
var spaceWidth = Math.round(diffLength / Math.max(1, words.length - 1));
|
|
|
|
//Get widths for every word with space only if there is more than one line
|
|
var wordWidths = [];
|
|
if (lineCount > 1) {
|
|
stagingTextNode.nodeValue = '';
|
|
for (var i = 0; i < words.length; i++) {
|
|
if (words[i].length === 0) continue;
|
|
stagingTextNode.nodeValue = decodeHtmlEntity(words[i]);
|
|
var bbox = stagingText.getBBox();
|
|
wordWidths.push({
|
|
text: words[i],
|
|
width: bbox.width
|
|
});
|
|
}
|
|
}
|
|
|
|
//Hide staging element after staging
|
|
svg.style.display = 'none';
|
|
|
|
return {
|
|
spaceWidth: spaceWidth,
|
|
lineCount: lineCount,
|
|
boundingBox: stagingTextBBox,
|
|
words: wordWidths
|
|
};
|
|
} else {
|
|
//todo: canvas fallback for measuring text on android 2.3
|
|
return false;
|
|
}
|
|
};
|
|
})();
|
|
|
|
var sgCanvasRenderer = (function() {
|
|
var canvas = newEl('canvas');
|
|
var ctx = null;
|
|
|
|
return function(sceneGraph) {
|
|
if (ctx == null) {
|
|
ctx = canvas.getContext('2d');
|
|
}
|
|
var root = sceneGraph.root;
|
|
canvas.width = App.dpr(root.properties.width);
|
|
canvas.height = App.dpr(root.properties.height);
|
|
ctx.textBaseline = 'middle';
|
|
|
|
ctx.fillStyle = root.children.holderBg.properties.fill;
|
|
ctx.fillRect(0, 0, App.dpr(root.children.holderBg.width), App.dpr(root.children.holderBg.height));
|
|
|
|
var textGroup = root.children.holderTextGroup;
|
|
var tgProps = textGroup.properties;
|
|
ctx.font = textGroup.properties.font.weight + ' ' + App.dpr(textGroup.properties.font.size) + textGroup.properties.font.units + ' ' + textGroup.properties.font.family + ', monospace';
|
|
ctx.fillStyle = textGroup.properties.fill;
|
|
|
|
for (var lineKey in textGroup.children) {
|
|
var line = textGroup.children[lineKey];
|
|
for (var wordKey in line.children) {
|
|
var word = line.children[wordKey];
|
|
var x = App.dpr(textGroup.x + line.x + word.x);
|
|
var y = App.dpr(textGroup.y + line.y + word.y + (textGroup.properties.leading / 2));
|
|
|
|
ctx.fillText(word.properties.text, x, y);
|
|
}
|
|
}
|
|
|
|
return canvas.toDataURL('image/png');
|
|
};
|
|
})();
|
|
|
|
var sgSVGRenderer = (function() {
|
|
//Prevent IE <9 from initializing SVG renderer
|
|
if (!global.XMLSerializer) return;
|
|
var svg = initSVG(null, 0, 0);
|
|
var bgEl = newEl('rect', SVG_NS);
|
|
svg.appendChild(bgEl);
|
|
|
|
//todo: create a reusable pool for textNodes, resize if more words present
|
|
|
|
return function(sceneGraph, renderSettings) {
|
|
var root = sceneGraph.root;
|
|
var holderURL = renderSettings.params.flags.holderURL;
|
|
var commentNode = document.createComment('\n' + 'Source URL: ' + holderURL + generatorComment);
|
|
|
|
initSVG(svg, root.properties.width, root.properties.height);
|
|
svg.insertBefore(commentNode, svg.firstChild);
|
|
|
|
var groups = svg.querySelectorAll('g');
|
|
|
|
for (var i = 0; i < groups.length; i++) {
|
|
groups[i].parentNode.removeChild(groups[i]);
|
|
}
|
|
|
|
setAttr(bgEl, {
|
|
'width': root.children.holderBg.width,
|
|
'height': root.children.holderBg.height,
|
|
'fill': root.children.holderBg.properties.fill
|
|
});
|
|
|
|
var textGroup = root.children.holderTextGroup;
|
|
var tgProps = textGroup.properties;
|
|
var textGroupEl = newEl('g', SVG_NS);
|
|
svg.appendChild(textGroupEl);
|
|
|
|
for (var lineKey in textGroup.children) {
|
|
var line = textGroup.children[lineKey];
|
|
for (var wordKey in line.children) {
|
|
var word = line.children[wordKey];
|
|
var x = textGroup.x + line.x + word.x;
|
|
var y = textGroup.y + line.y + word.y + (textGroup.properties.leading / 2);
|
|
|
|
var textEl = newEl('text', SVG_NS);
|
|
var textNode = document.createTextNode(null);
|
|
|
|
setAttr(textEl, {
|
|
'x': x,
|
|
'y': y,
|
|
'style': cssProps({
|
|
'fill': tgProps.fill,
|
|
'font-weight': tgProps.font.weight,
|
|
'font-family': tgProps.font.family + ', monospace',
|
|
'font-size': tgProps.font.size + tgProps.font.units,
|
|
'dominant-baseline': 'central'
|
|
})
|
|
});
|
|
|
|
textNode.nodeValue = word.properties.text;
|
|
textEl.appendChild(textNode);
|
|
textGroupEl.appendChild(textEl);
|
|
}
|
|
}
|
|
|
|
var svgString = 'data:image/svg+xml;base64,' +
|
|
btoa(unescape(encodeURIComponent(serializeSVG(svg, renderSettings.engineSettings))));
|
|
return svgString;
|
|
};
|
|
})();
|
|
|
|
//Helpers
|
|
|
|
/**
|
|
* Generic new DOM element function
|
|
*
|
|
* @private
|
|
* @param tag Tag to create
|
|
* @param namespace Optional namespace value
|
|
*/
|
|
function newEl(tag, namespace) {
|
|
if (namespace == null) {
|
|
return document.createElement(tag);
|
|
} else {
|
|
return document.createElementNS(namespace, tag);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Generic setAttribute function
|
|
*
|
|
* @private
|
|
* @param el Reference to DOM element
|
|
* @param attrs Object with attribute keys and values
|
|
*/
|
|
function setAttr(el, attrs) {
|
|
for (var a in attrs) {
|
|
el.setAttribute(a, attrs[a]);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Generic SVG element creation function
|
|
*
|
|
* @private
|
|
* @param svg SVG context, set to null if new
|
|
* @param width Document width
|
|
* @param height Document height
|
|
*/
|
|
function initSVG(svg, width, height) {
|
|
if (svg == null) {
|
|
svg = newEl('svg', SVG_NS);
|
|
var defs = newEl('defs', SVG_NS);
|
|
svg.appendChild(defs);
|
|
}
|
|
//IE throws an exception if this is set and Chrome requires it to be set
|
|
if (svg.webkitMatchesSelector) {
|
|
svg.setAttribute('xmlns', SVG_NS);
|
|
}
|
|
//Remove comment nodes
|
|
for (var i = 0; i < svg.childNodes.length; i++) {
|
|
if (svg.childNodes[i].nodeType === NODE_TYPE_COMMENT) {
|
|
svg.removeChild(svg.childNodes[i]);
|
|
}
|
|
}
|
|
|
|
setAttr(svg, {
|
|
'width': width,
|
|
'height': height,
|
|
'viewBox': '0 0 ' + width + ' ' + height,
|
|
'preserveAspectRatio': 'none'
|
|
});
|
|
return svg;
|
|
}
|
|
|
|
/**
|
|
* Generic SVG serialization function
|
|
*
|
|
* @private
|
|
* @param svg SVG context
|
|
* @param stylesheets CSS stylesheets to include
|
|
*/
|
|
function serializeSVG(svg, engineSettings) {
|
|
if (!global.XMLSerializer) return;
|
|
var serializer = new XMLSerializer();
|
|
var svgCSS = '';
|
|
var stylesheets = engineSettings.stylesheets;
|
|
var defs = svg.querySelector('defs');
|
|
|
|
//External stylesheets: Processing Instruction method
|
|
if (engineSettings.svgXMLStylesheet) {
|
|
var xml = new DOMParser().parseFromString('<xml />', 'application/xml');
|
|
//Add <?xml-stylesheet ?> directives
|
|
for (var i = stylesheets.length - 1; i >= 0; i--) {
|
|
var csspi = xml.createProcessingInstruction('xml-stylesheet', 'href="' + stylesheets[i] + '" rel="stylesheet"');
|
|
xml.insertBefore(csspi, xml.firstChild);
|
|
}
|
|
|
|
//Add <?xml ... ?> UTF-8 directive
|
|
var xmlpi = xml.createProcessingInstruction('xml', 'version="1.0" encoding="UTF-8" standalone="yes"');
|
|
xml.insertBefore(xmlpi, xml.firstChild);
|
|
xml.removeChild(xml.documentElement);
|
|
svgCSS = serializer.serializeToString(xml);
|
|
}
|
|
|
|
/*
|
|
|
|
//External stylesheets: <link> method
|
|
if (renderSettings.svgLinkStylesheet) {
|
|
|
|
defs.removeChild(defs.firstChild);
|
|
for (i = 0; i < stylesheets.length; i++) {
|
|
var link = document.createElementNS('http://www.w3.org/1999/xhtml', 'link');
|
|
link.setAttribute('href', stylesheets[i]);
|
|
link.setAttribute('rel', 'stylesheet');
|
|
link.setAttribute('type', 'text/css');
|
|
defs.appendChild(link);
|
|
}
|
|
}
|
|
|
|
//External stylesheets: <style> and @import method
|
|
if (renderSettings.svgImportStylesheet) {
|
|
var style = document.createElementNS(SVG_NS, 'style');
|
|
var styleText = [];
|
|
|
|
for (i = 0; i < stylesheets.length; i++) {
|
|
styleText.push('@import url(' + stylesheets[i] + ');');
|
|
}
|
|
|
|
var styleTextNode = document.createTextNode(styleText.join('\n'));
|
|
style.appendChild(styleTextNode);
|
|
defs.appendChild(style);
|
|
}
|
|
|
|
*/
|
|
|
|
var svgText = serializer.serializeToString(svg);
|
|
svgText = svgText.replace(/\&(\#[0-9]{2,}\;)/g, '&$1');
|
|
return svgCSS + svgText;
|
|
}
|
|
|
|
/**
|
|
* Shallow object clone and merge
|
|
*
|
|
* @param a Object A
|
|
* @param b Object B
|
|
* @returns {Object} New object with all of A's properties, and all of B's properties, overwriting A's properties
|
|
*/
|
|
function extend(a, b) {
|
|
var c = {};
|
|
for (var x in a) {
|
|
if (a.hasOwnProperty(x)) {
|
|
c[x] = a[x];
|
|
}
|
|
}
|
|
if (b != null) {
|
|
for (var y in b) {
|
|
if (b.hasOwnProperty(y)) {
|
|
c[y] = b[y];
|
|
}
|
|
}
|
|
}
|
|
return c;
|
|
}
|
|
|
|
/**
|
|
* Takes a k/v list of CSS properties and returns a rule
|
|
*
|
|
* @param props CSS properties object
|
|
*/
|
|
function cssProps(props) {
|
|
var ret = [];
|
|
for (var p in props) {
|
|
if (props.hasOwnProperty(p)) {
|
|
ret.push(p + ':' + props[p]);
|
|
}
|
|
}
|
|
return ret.join(';');
|
|
}
|
|
|
|
/**
|
|
* Prevents a function from being called too often, waits until a timer elapses to call it again
|
|
*
|
|
* @param fn Function to call
|
|
*/
|
|
function debounce(fn) {
|
|
if (!App.vars.debounceTimer) fn.call(this);
|
|
if (App.vars.debounceTimer) clearTimeout(App.vars.debounceTimer);
|
|
App.vars.debounceTimer = setTimeout(function() {
|
|
App.vars.debounceTimer = null;
|
|
fn.call(this);
|
|
}, App.setup.debounce);
|
|
}
|
|
|
|
/**
|
|
* Holder-specific resize/orientation change callback, debounced to prevent excessive execution
|
|
*/
|
|
function resizeEvent() {
|
|
debounce(function() {
|
|
updateResizableElements(null);
|
|
});
|
|
}
|
|
|
|
/**
|
|
* Converts a value into an array of DOM nodes
|
|
*
|
|
* @param val A string, a NodeList, a Node, or an HTMLCollection
|
|
*/
|
|
function getNodeArray(val) {
|
|
var retval = null;
|
|
if (typeof(val) == 'string') {
|
|
retval = document.querySelectorAll(val);
|
|
} else if (global.NodeList && val instanceof global.NodeList) {
|
|
retval = val;
|
|
} else if (global.Node && val instanceof global.Node) {
|
|
retval = [val];
|
|
} else if (global.HTMLCollection && val instanceof global.HTMLCollection) {
|
|
retval = val;
|
|
} else if (val === null) {
|
|
retval = [];
|
|
}
|
|
return retval;
|
|
}
|
|
|
|
/**
|
|
* Checks if an image exists
|
|
*
|
|
* @param params Configuration object, must specify at least a src key
|
|
* @param callback Callback to call once image status has been found
|
|
*/
|
|
function imageExists(src, callback) {
|
|
var image = new Image();
|
|
image.onerror = function() {
|
|
callback.call(this, false);
|
|
};
|
|
image.onload = function() {
|
|
callback.call(this, true);
|
|
};
|
|
image.src = src;
|
|
}
|
|
|
|
/**
|
|
* Encodes HTML entities in a string
|
|
*
|
|
* @param str Input string
|
|
*/
|
|
function encodeHtmlEntity(str) {
|
|
var buf = [];
|
|
var charCode = 0;
|
|
for (var i = str.length - 1; i >= 0; i--) {
|
|
charCode = str.charCodeAt(i);
|
|
if (charCode > 128) {
|
|
buf.unshift(['&#', charCode, ';'].join(''));
|
|
} else {
|
|
buf.unshift(str[i]);
|
|
}
|
|
}
|
|
return buf.join('');
|
|
}
|
|
|
|
/**
|
|
* Decodes HTML entities in a stirng
|
|
*
|
|
* @param str Input string
|
|
*/
|
|
function decodeHtmlEntity(str) {
|
|
return str.replace(/&#(\d+);/g, function(match, dec) {
|
|
return String.fromCharCode(dec);
|
|
});
|
|
}
|
|
|
|
// Scene graph
|
|
|
|
var SceneGraph = function(sceneProperties) {
|
|
var nodeCount = 1;
|
|
|
|
//todo: move merge to helpers section
|
|
function merge(parent, child) {
|
|
for (var prop in child) {
|
|
parent[prop] = child[prop];
|
|
}
|
|
return parent;
|
|
}
|
|
|
|
var SceneNode = augment.defclass({
|
|
constructor: function(name) {
|
|
nodeCount++;
|
|
this.parent = null;
|
|
this.children = {};
|
|
this.id = nodeCount;
|
|
this.name = 'n' + nodeCount;
|
|
if (name != null) {
|
|
this.name = name;
|
|
}
|
|
this.x = 0;
|
|
this.y = 0;
|
|
this.z = 0;
|
|
this.width = 0;
|
|
this.height = 0;
|
|
},
|
|
resize: function(width, height) {
|
|
if (width != null) {
|
|
this.width = width;
|
|
}
|
|
if (height != null) {
|
|
this.height = height;
|
|
}
|
|
},
|
|
moveTo: function(x, y, z) {
|
|
this.x = x != null ? x : this.x;
|
|
this.y = y != null ? y : this.y;
|
|
this.z = z != null ? z : this.z;
|
|
},
|
|
add: function(child) {
|
|
var name = child.name;
|
|
if (this.children[name] == null) {
|
|
this.children[name] = child;
|
|
child.parent = this;
|
|
} else {
|
|
throw 'SceneGraph: child with that name already exists: ' + name;
|
|
}
|
|
}
|
|
/*, // probably unnecessary in Holder
|
|
remove: function(name){
|
|
if(this.children[name] == null){
|
|
throw 'SceneGraph: child with that name doesn\'t exist: '+name;
|
|
}
|
|
else{
|
|
child.parent = null;
|
|
delete this.children[name];
|
|
}
|
|
},
|
|
removeAll: function(){
|
|
for(var child in this.children){
|
|
this.remove(child);
|
|
}
|
|
}*/
|
|
});
|
|
|
|
var RootNode = augment(SceneNode, function(uber) {
|
|
this.constructor = function() {
|
|
uber.constructor.call(this, 'root');
|
|
this.properties = sceneProperties;
|
|
};
|
|
});
|
|
|
|
var Shape = augment(SceneNode, function(uber) {
|
|
function constructor(name, props) {
|
|
uber.constructor.call(this, name);
|
|
this.properties = {
|
|
fill: '#000'
|
|
};
|
|
if (props != null) {
|
|
merge(this.properties, props);
|
|
} else if (name != null && typeof name !== 'string') {
|
|
throw 'SceneGraph: invalid node name';
|
|
}
|
|
}
|
|
|
|
this.Group = augment.extend(this, {
|
|
constructor: constructor,
|
|
type: 'group'
|
|
});
|
|
|
|
this.Rect = augment.extend(this, {
|
|
constructor: constructor,
|
|
type: 'rect'
|
|
});
|
|
|
|
this.Text = augment.extend(this, {
|
|
constructor: function(text) {
|
|
constructor.call(this);
|
|
this.properties.text = text;
|
|
},
|
|
type: 'text'
|
|
});
|
|
});
|
|
|
|
var root = new RootNode();
|
|
|
|
this.Shape = Shape;
|
|
this.root = root;
|
|
|
|
return this;
|
|
};
|
|
|
|
//Set up flags
|
|
|
|
for (var flag in App.flags) {
|
|
if (!App.flags.hasOwnProperty(flag)) continue;
|
|
App.flags[flag].match = function(val) {
|
|
return val.match(this.regex);
|
|
};
|
|
}
|
|
|
|
//Properties set once on setup
|
|
|
|
App.setup = {
|
|
renderer: 'html',
|
|
debounce: 100,
|
|
ratio: 1,
|
|
supportsCanvas: false,
|
|
supportsSVG: false,
|
|
lineWrapRatio: 0.9,
|
|
renderers: ['html', 'canvas', 'svg']
|
|
};
|
|
|
|
App.dpr = function(val) {
|
|
return val * App.setup.ratio;
|
|
};
|
|
|
|
//Properties modified during runtime
|
|
|
|
App.vars = {
|
|
preempted: false,
|
|
resizableImages: [],
|
|
debounceTimer: null,
|
|
cache: {}
|
|
};
|
|
|
|
//Pre-flight
|
|
|
|
(function() {
|
|
var devicePixelRatio = 1,
|
|
backingStoreRatio = 1;
|
|
|
|
var canvas = newEl('canvas');
|
|
var ctx = null;
|
|
|
|
if (canvas.getContext) {
|
|
if (canvas.toDataURL('image/png').indexOf('data:image/png') != -1) {
|
|
App.setup.renderer = 'canvas';
|
|
ctx = canvas.getContext('2d');
|
|
App.setup.supportsCanvas = true;
|
|
}
|
|
}
|
|
|
|
if (App.setup.supportsCanvas) {
|
|
devicePixelRatio = global.devicePixelRatio || 1;
|
|
backingStoreRatio = ctx.webkitBackingStorePixelRatio || ctx.mozBackingStorePixelRatio || ctx.msBackingStorePixelRatio || ctx.oBackingStorePixelRatio || ctx.backingStorePixelRatio || 1;
|
|
}
|
|
|
|
App.setup.ratio = devicePixelRatio / backingStoreRatio;
|
|
|
|
if (!!document.createElementNS && !!document.createElementNS(SVG_NS, 'svg').createSVGRect) {
|
|
App.setup.renderer = 'svg';
|
|
App.setup.supportsSVG = true;
|
|
}
|
|
})();
|
|
|
|
//Exposing to environment and setting up listeners
|
|
register(Holder, 'Holder', global);
|
|
|
|
if (global.onDomReady) {
|
|
global.onDomReady(function() {
|
|
if (!App.vars.preempted) {
|
|
Holder.run();
|
|
}
|
|
if (global.addEventListener) {
|
|
global.addEventListener('resize', resizeEvent, false);
|
|
global.addEventListener('orientationchange', resizeEvent, false);
|
|
} else {
|
|
global.attachEvent('onresize', resizeEvent);
|
|
}
|
|
|
|
if (typeof global.Turbolinks == 'object') {
|
|
global.document.addEventListener('page:change', function() {
|
|
Holder.run();
|
|
});
|
|
}
|
|
});
|
|
}
|
|
|
|
})(function(fn, name, global) {
|
|
var isAMD = (typeof define === 'function' && define.amd);
|
|
var isNode = (typeof exports === 'object');
|
|
var isWeb = !isNode;
|
|
|
|
if (isAMD) {
|
|
define(fn);
|
|
} else {
|
|
//todo: npm/browserify registration
|
|
global[name] = fn;
|
|
}
|
|
}, this); |