mirror of
https://github.com/LaCasemate/fab-manager.git
synced 2025-02-22 16:54:15 +01:00
1416 lines
46 KiB
JavaScript
1416 lines
46 KiB
JavaScript
/*
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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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//Libraries and functions
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var onDomReady = require('./lib/ondomready');
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var SceneGraph = require('./scenegraph');
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var utils = require('./utils');
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var extend = utils.extend;
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var cssProps = utils.cssProps;
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var encodeHtmlEntity = utils.encodeHtmlEntity;
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var decodeHtmlEntity = utils.decodeHtmlEntity;
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var imageExists = utils.imageExists;
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var getNodeArray = utils.getNodeArray;
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var dimensionCheck = utils.dimensionCheck;
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//Constants and definitions
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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 version = '%version%';
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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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var Holder = {
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version: version,
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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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*/
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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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* 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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*/
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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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var domProps = {};
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domProps[App.vars.dataAttr] = src;
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setAttr(img, domProps);
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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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/**
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* Sets whether or not an image is updated on resize.
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* If an image is set to be updated, it is immediately rendered.
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*
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* @param {Object} el Image DOM element
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* @param {Boolean} value Resizable update flag value
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*/
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setResizeUpdate: function(el, value) {
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if (el.holderData) {
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el.holderData.resizeUpdate = !!value;
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if (el.holderData.resizeUpdate) {
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updateResizableElements(el);
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}
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}
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},
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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.
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*
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* @param {Object} userOptions Options object, can contain domain, themes, images, and bgnodes properties
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*/
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run: function(userOptions) {
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userOptions = userOptions || {};
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var engineSettings = {};
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var options = extend(App.settings, userOptions);
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App.vars.preempted = true;
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App.vars.dataAttr = options.dataAttr || App.vars.dataAttr;
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engineSettings.renderer = options.renderer ? options.renderer : App.setup.renderer;
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if (App.setup.renderers.join(',').indexOf(engineSettings.renderer) === -1) {
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engineSettings.renderer = App.setup.supportsSVG ? 'svg' : (App.setup.supportsCanvas ? 'canvas' : 'html');
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}
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var images = getNodeArray(options.images);
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var bgnodes = getNodeArray(options.bgnodes);
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var stylenodes = getNodeArray(options.stylenodes);
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var objects = getNodeArray(options.objects);
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engineSettings.stylesheets = [];
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engineSettings.svgXMLStylesheet = true;
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engineSettings.noFontFallback = options.noFontFallback ? options.noFontFallback : false;
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for (var i = 0; i < stylenodes.length; i++) {
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var styleNode = stylenodes[i];
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if (styleNode.attributes.rel && styleNode.attributes.href && styleNode.attributes.rel.value == 'stylesheet') {
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var href = styleNode.attributes.href.value;
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//todo: write isomorphic relative-to-absolute URL function
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var proxyLink = newEl('a');
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proxyLink.href = href;
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var stylesheetURL = proxyLink.protocol + '//' + proxyLink.host + proxyLink.pathname + proxyLink.search;
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engineSettings.stylesheets.push(stylesheetURL);
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}
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}
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for (i = 0; i < bgnodes.length; i++) {
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//Skip processing background nodes if getComputedStyle is unavailable, since only modern browsers would be able to use canvas or SVG to render to background
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if (!global.getComputedStyle) continue;
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var backgroundImage = global.getComputedStyle(bgnodes[i], null).getPropertyValue('background-image');
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var dataBackgroundImage = bgnodes[i].getAttribute('data-background-src');
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var rawURL = null;
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if (dataBackgroundImage == null) {
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rawURL = backgroundImage;
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} else {
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rawURL = dataBackgroundImage;
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}
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var holderURL = null;
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var holderString = '?' + options.domain + '/';
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if (rawURL.indexOf(holderString) === 0) {
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holderURL = rawURL.slice(1);
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} else if (rawURL.indexOf(holderString) != -1) {
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var fragment = rawURL.substr(rawURL.indexOf(holderString)).slice(1);
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var fragmentMatch = fragment.match(/([^\"]*)"?\)/);
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if (fragmentMatch != null) {
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holderURL = fragmentMatch[1];
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}
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}
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if (holderURL != null) {
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var holderFlags = parseURL(holderURL, options);
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if (holderFlags) {
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prepareDOMElement({
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mode: 'background',
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el: bgnodes[i],
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flags: holderFlags,
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engineSettings: engineSettings
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});
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}
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}
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}
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for (i = 0; i < objects.length; i++) {
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var object = objects[i];
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var objectAttr = {};
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try {
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objectAttr.data = object.getAttribute('data');
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objectAttr.dataSrc = object.getAttribute(App.vars.dataAttr);
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} catch (e) {}
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var objectHasSrcURL = objectAttr.data != null && objectAttr.data.indexOf(options.domain) === 0;
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var objectHasDataSrcURL = objectAttr.dataSrc != null && objectAttr.dataSrc.indexOf(options.domain) === 0;
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if (objectHasSrcURL) {
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prepareImageElement(options, engineSettings, objectAttr.data, object);
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} else if (objectHasDataSrcURL) {
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prepareImageElement(options, engineSettings, objectAttr.dataSrc, object);
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}
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}
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for (i = 0; i < images.length; i++) {
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var image = images[i];
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var imageAttr = {};
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try {
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imageAttr.src = image.getAttribute('src');
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imageAttr.dataSrc = image.getAttribute(App.vars.dataAttr);
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imageAttr.rendered = image.getAttribute('data-holder-rendered');
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} catch (e) {}
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var imageHasSrc = imageAttr.src != null;
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var imageHasDataSrcURL = imageAttr.dataSrc != null && imageAttr.dataSrc.indexOf(options.domain) === 0;
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var imageRendered = imageAttr.rendered != null && imageAttr.rendered == 'true';
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if (imageHasSrc) {
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if (imageAttr.src.indexOf(options.domain) === 0) {
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prepareImageElement(options, engineSettings, imageAttr.src, image);
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} else if (imageHasDataSrcURL) {
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//Image has a valid data-src and an invalid src
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if (imageRendered) {
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//If the placeholder has already been render, re-render it
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prepareImageElement(options, engineSettings, imageAttr.dataSrc, image);
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} else {
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//If the placeholder has not been rendered, check if the image exists and render a fallback if it doesn't
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(function(src, options, engineSettings, dataSrc, image) {
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imageExists(src, function(exists) {
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if (!exists) {
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prepareImageElement(options, engineSettings, dataSrc, image);
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}
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});
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})(imageAttr.src, options, engineSettings, imageAttr.dataSrc, image);
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}
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}
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} else if (imageHasDataSrcURL) {
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prepareImageElement(options, engineSettings, imageAttr.dataSrc, image);
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}
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}
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return this;
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}
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};
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var App = {
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settings: {
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domain: 'holder.js',
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images: 'img',
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objects: 'object',
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bgnodes: 'body .holderjs',
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stylenodes: 'head link.holderjs',
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stylesheets: [],
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themes: {
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'gray': {
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background: '#EEEEEE',
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foreground: '#AAAAAA'
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},
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'social': {
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background: '#3a5a97',
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foreground: '#FFFFFF'
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},
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'industrial': {
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background: '#434A52',
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foreground: '#C2F200'
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},
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'sky': {
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background: '#0D8FDB',
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foreground: '#FFFFFF'
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},
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'vine': {
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background: '#39DBAC',
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foreground: '#1E292C'
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},
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'lava': {
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background: '#F8591A',
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foreground: '#1C2846'
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}
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}
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},
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defaults: {
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size: 10,
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units: 'pt',
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scale: 1 / 16
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},
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flags: {
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dimensions: {
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regex: /^(\d+)x(\d+)$/,
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output: function(val) {
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var exec = this.regex.exec(val);
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return {
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width: +exec[1],
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height: +exec[2]
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};
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}
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},
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fluid: {
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regex: /^([0-9]+%?)x([0-9]+%?)$/,
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output: function(val) {
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var exec = this.regex.exec(val);
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return {
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width: exec[1],
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height: exec[2]
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};
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}
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},
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colors: {
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regex: /(?:#|\^)([0-9a-f]{3,})\:(?:#|\^)([0-9a-f]{3,})/i,
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output: function(val) {
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var exec = this.regex.exec(val);
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return {
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foreground: '#' + exec[2],
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background: '#' + exec[1]
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};
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}
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},
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text: {
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regex: /text\:(.*)/,
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output: function(val) {
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return this.regex.exec(val)[1].replace('\\/', '/');
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}
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},
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font: {
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regex: /font\:(.*)/,
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output: function(val) {
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return this.regex.exec(val)[1];
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}
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},
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auto: {
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regex: /^auto$/
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},
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textmode: {
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regex: /textmode\:(.*)/,
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output: function(val) {
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return this.regex.exec(val)[1];
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}
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},
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random: {
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regex: /^random$/
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},
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size: {
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regex: /size\:(\d+)/,
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output: function(val) {
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return this.regex.exec(val)[1];
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}
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}
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}
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};
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/**
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* Processes provided source attribute and sets up the appropriate rendering workflow
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*
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* @private
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* @param options Instance options from Holder.run
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* @param renderSettings Instance configuration
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* @param src Image URL
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* @param el Image DOM element
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*/
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function prepareImageElement(options, engineSettings, src, el) {
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var holderFlags = parseURL(src.substr(src.lastIndexOf(options.domain)), options);
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if (holderFlags) {
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prepareDOMElement({
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mode: null,
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el: el,
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flags: holderFlags,
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engineSettings: engineSettings
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});
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}
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}
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/**
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* Processes a Holder URL and extracts flags
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*
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* @private
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* @param url URL
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* @param options Instance options from Holder.run
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*/
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function parseURL(url, options) {
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var ret = {
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theme: extend(App.settings.themes.gray, null),
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stylesheets: options.stylesheets,
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holderURL: []
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};
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var render = false;
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var vtab = String.fromCharCode(11);
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var flags = url.replace(/([^\\])\//g, '$1' + vtab).split(vtab);
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var uriRegex = /%[0-9a-f]{2}/gi;
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for (var fl = flags.length, j = 0; j < fl; j++) {
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var flag = flags[j];
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if (flag.match(uriRegex)) {
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try {
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flag = decodeURIComponent(flag);
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} catch (e) {
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flag = flags[j];
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}
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}
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var push = false;
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if (App.flags.dimensions.match(flag)) {
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render = true;
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ret.dimensions = App.flags.dimensions.output(flag);
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push = true;
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} else if (App.flags.fluid.match(flag)) {
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render = true;
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ret.dimensions = App.flags.fluid.output(flag);
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ret.fluid = true;
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push = true;
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} else if (App.flags.textmode.match(flag)) {
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ret.textmode = App.flags.textmode.output(flag);
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push = true;
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} else if (App.flags.colors.match(flag)) {
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var colors = App.flags.colors.output(flag);
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ret.theme = extend(ret.theme, colors);
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//todo: convert implicit theme use to a theme: flag
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push = true;
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} else if (options.themes[flag]) {
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//If a theme is specified, it will override custom colors
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if (options.themes.hasOwnProperty(flag)) {
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ret.theme = extend(options.themes[flag], null);
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}
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push = true;
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} else if (App.flags.font.match(flag)) {
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ret.font = App.flags.font.output(flag);
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push = true;
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} else if (App.flags.auto.match(flag)) {
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ret.auto = true;
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push = true;
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} else if (App.flags.text.match(flag)) {
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ret.text = App.flags.text.output(flag);
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push = true;
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} else if (App.flags.size.match(flag)) {
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ret.size = App.flags.size.output(flag);
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push = true;
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} else if (App.flags.random.match(flag)) {
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if (App.vars.cache.themeKeys == null) {
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App.vars.cache.themeKeys = Object.keys(options.themes);
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}
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var theme = App.vars.cache.themeKeys[0 | Math.random() * App.vars.cache.themeKeys.length];
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ret.theme = extend(options.themes[theme], null);
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push = true;
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}
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if (push) {
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ret.holderURL.push(flag);
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}
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}
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ret.holderURL.unshift(options.domain);
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ret.holderURL = ret.holderURL.join('/');
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return render ? ret : false;
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}
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/**
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* Modifies the DOM to fit placeholders and sets up resizable image callbacks (for fluid and automatically sized placeholders)
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*
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* @private
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* @param settings DOM prep settings
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*/
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function prepareDOMElement(prepSettings) {
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var mode = prepSettings.mode;
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var el = prepSettings.el;
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var flags = prepSettings.flags;
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var _engineSettings = prepSettings.engineSettings;
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var dimensions = flags.dimensions,
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theme = flags.theme;
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var dimensionsCaption = dimensions.width + 'x' + dimensions.height;
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mode = mode == null ? (flags.fluid ? 'fluid' : 'image') : mode;
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if (flags.text != null) {
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theme.text = flags.text;
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//<object> SVG embedding doesn't parse Unicode properly
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if (el.nodeName.toLowerCase() === 'object') {
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var textLines = theme.text.split('\\n');
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for (var k = 0; k < textLines.length; k++) {
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textLines[k] = encodeHtmlEntity(textLines[k]);
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}
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theme.text = textLines.join('\\n');
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}
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}
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var holderURL = flags.holderURL;
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var engineSettings = extend(_engineSettings, null);
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if (flags.font) {
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theme.font = flags.font;
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//Only run the <canvas> webfont fallback if noFontFallback is false, if the node is not an image, and if canvas is supported
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if (!engineSettings.noFontFallback && el.nodeName.toLowerCase() === 'img' && App.setup.supportsCanvas && engineSettings.renderer === 'svg') {
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engineSettings = extend(engineSettings, {
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renderer: 'canvas'
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});
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}
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}
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//Chrome and Opera require a quick 10ms re-render if web fonts are used with canvas
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if (flags.font && engineSettings.renderer == 'canvas') {
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engineSettings.reRender = true;
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}
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if (mode == 'background') {
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if (el.getAttribute('data-background-src') == null) {
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setAttr(el, {
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'data-background-src': holderURL
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});
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}
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} else {
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var domProps = {};
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domProps[App.vars.dataAttr] = holderURL;
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setAttr(el, domProps);
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}
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flags.theme = theme;
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//todo consider using all renderSettings in holderData
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el.holderData = {
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flags: flags,
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engineSettings: engineSettings
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};
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if (mode == 'image' || mode == 'fluid') {
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setAttr(el, {
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'alt': (theme.text ? theme.text + ' [' + dimensionsCaption + ']' : dimensionsCaption)
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});
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}
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var renderSettings = {
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mode: mode,
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el: el,
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holderSettings: {
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dimensions: dimensions,
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theme: theme,
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flags: flags
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},
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engineSettings: engineSettings
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};
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if (mode == 'image') {
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if (engineSettings.renderer == 'html' || !flags.auto) {
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el.style.width = dimensions.width + 'px';
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el.style.height = dimensions.height + 'px';
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}
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if (engineSettings.renderer == 'html') {
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el.style.backgroundColor = theme.background;
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} else {
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render(renderSettings);
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if (flags.textmode == 'exact') {
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el.holderData.resizeUpdate = true;
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App.vars.resizableImages.push(el);
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updateResizableElements(el);
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}
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}
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} else if (mode == 'background' && engineSettings.renderer != 'html') {
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render(renderSettings);
|
|
} else if (mode == 'fluid') {
|
|
el.holderData.resizeUpdate = true;
|
|
|
|
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;
|
|
var holderSettings = renderSettings.holderSettings;
|
|
var el = renderSettings.el;
|
|
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: holderSettings.dimensions.width,
|
|
height: holderSettings.dimensions.height,
|
|
theme: holderSettings.theme,
|
|
flags: holderSettings.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) {
|
|
global.setTimeout(function() {
|
|
var image = getRenderedImage();
|
|
if (image == null) {
|
|
throw 'Holder: couldn\'t render placeholder';
|
|
}
|
|
//todo: refactor this code into a function
|
|
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);
|
|
}
|
|
}
|
|
//todo: account for re-rendering
|
|
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) {
|
|
var fontSize = App.defaults.size;
|
|
if (parseFloat(scene.theme.size)) {
|
|
fontSize = scene.theme.size;
|
|
} else if (parseFloat(scene.flags.size)) {
|
|
fontSize = scene.flags.size;
|
|
}
|
|
|
|
scene.font = {
|
|
family: scene.theme.font ? scene.theme.font : 'Arial, Helvetica, Open Sans, sans-serif',
|
|
size: textSize(scene.width, scene.height, fontSize),
|
|
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) {
|
|
var stageWidth = parseInt(width, 10);
|
|
var stageHeight = parseInt(height, 10);
|
|
|
|
var bigSide = Math.max(stageWidth, stageHeight);
|
|
var smallSide = Math.min(stageWidth, stageHeight);
|
|
|
|
var newHeight = 0.8 * Math.min(smallSide, bigSide * App.defaults.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 = 0, l = images.length; i < l; i++) {
|
|
var el = images[i];
|
|
if (el.holderData) {
|
|
var flags = el.holderData.flags;
|
|
var dimensions = dimensionCheck(el);
|
|
if (dimensions) {
|
|
if (!el.holderData.resizeUpdate) {
|
|
continue;
|
|
}
|
|
|
|
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',
|
|
holderSettings: {
|
|
dimensions: dimensions,
|
|
theme: flags.theme,
|
|
flags: flags
|
|
},
|
|
el: el,
|
|
engineSettings: el.holderData.engineSettings
|
|
};
|
|
|
|
if (flags.textmode == 'exact') {
|
|
flags.exactDimensions = dimensions;
|
|
settings.holderSettings.dimensions = flags.dimensions;
|
|
}
|
|
|
|
render(settings);
|
|
} else {
|
|
setInvisible(el);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
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;
|
|
} else {
|
|
setInvisible(el);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Iterates through all current invisible images, and if they're visible, renders them and removes them from further checks. Runs every animation frame.
|
|
*
|
|
* @private
|
|
*/
|
|
function visibilityCheck() {
|
|
var renderableImages = [];
|
|
var keys = Object.keys(App.vars.invisibleImages);
|
|
var el;
|
|
for (var i = 0, l = keys.length; i < l; i++) {
|
|
el = App.vars.invisibleImages[keys[i]];
|
|
if (dimensionCheck(el) && el.nodeName.toLowerCase() == 'img') {
|
|
renderableImages.push(el);
|
|
delete App.vars.invisibleImages[keys[i]];
|
|
}
|
|
}
|
|
|
|
if (renderableImages.length) {
|
|
Holder.run({
|
|
images: renderableImages
|
|
});
|
|
}
|
|
|
|
global.requestAnimationFrame(visibilityCheck);
|
|
}
|
|
|
|
/**
|
|
* Starts checking for invisible placeholders if not doing so yet. Does nothing otherwise.
|
|
*
|
|
* @private
|
|
*/
|
|
function startVisibilityCheck() {
|
|
if (!App.vars.visibilityCheckStarted) {
|
|
global.requestAnimationFrame(visibilityCheck);
|
|
App.vars.visibilityCheckStarted = true;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Sets a unique ID for an image detected to be invisible and adds it to the map of invisible images checked by visibilityCheck
|
|
*
|
|
* @private
|
|
* @param el Invisible DOM element
|
|
*/
|
|
function setInvisible(el) {
|
|
if (!el.holderData.invisibleId) {
|
|
App.vars.invisibleId += 1;
|
|
App.vars.invisibleImages['i' + App.vars.invisibleId] = el;
|
|
el.holderData.invisibleId = App.vars.invisibleId;
|
|
}
|
|
}
|
|
|
|
//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
|
|
})
|
|
});
|
|
|
|
//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 xml = createXML();
|
|
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;
|
|
|
|
initSVG(svg, root.properties.width, root.properties.height);
|
|
|
|
var groups = svg.querySelectorAll('g');
|
|
|
|
for (var i = 0; i < groups.length; i++) {
|
|
groups[i].parentNode.removeChild(groups[i]);
|
|
}
|
|
|
|
var holderURL = renderSettings.holderSettings.flags.holderURL;
|
|
var holderId = 'holder_' + (Number(new Date()) + 32768 + (0 | Math.random() * 32768)).toString(16);
|
|
var sceneGroupEl = newEl('g', SVG_NS);
|
|
var textGroup = root.children.holderTextGroup;
|
|
var tgProps = textGroup.properties;
|
|
var textGroupEl = newEl('g', SVG_NS);
|
|
var tpdata = textGroup.textPositionData;
|
|
var textCSSRule = '#' + holderId + ' text { ' +
|
|
cssProps({
|
|
'fill': tgProps.fill,
|
|
'font-weight': tgProps.font.weight,
|
|
'font-family': tgProps.font.family + ', monospace',
|
|
'font-size': tgProps.font.size + tgProps.font.units
|
|
}) + ' } ';
|
|
var commentNode = xml.createComment('\n' + 'Source URL: ' + holderURL + generatorComment);
|
|
var holderCSS = xml.createCDATASection(textCSSRule);
|
|
var styleEl = svg.querySelector('style');
|
|
|
|
setAttr(sceneGroupEl, {
|
|
id: holderId
|
|
});
|
|
|
|
svg.insertBefore(commentNode, svg.firstChild);
|
|
styleEl.appendChild(holderCSS);
|
|
|
|
sceneGroupEl.appendChild(bgEl);
|
|
sceneGroupEl.appendChild(textGroupEl);
|
|
svg.appendChild(sceneGroupEl);
|
|
|
|
setAttr(bgEl, {
|
|
'width': root.children.holderBg.width,
|
|
'height': root.children.holderBg.height,
|
|
'fill': root.children.holderBg.properties.fill
|
|
});
|
|
|
|
textGroup.y += tpdata.boundingBox.height * 0.8;
|
|
|
|
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;
|
|
|
|
var textEl = newEl('text', SVG_NS);
|
|
var textNode = document.createTextNode(null);
|
|
|
|
setAttr(textEl, {
|
|
'x': x,
|
|
'y': y
|
|
});
|
|
|
|
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) {
|
|
var defs, style;
|
|
|
|
if (svg == null) {
|
|
svg = newEl('svg', SVG_NS);
|
|
defs = newEl('defs', SVG_NS);
|
|
style = newEl('style', SVG_NS);
|
|
setAttr(style, {
|
|
'type': 'text/css'
|
|
});
|
|
defs.appendChild(style);
|
|
svg.appendChild(defs);
|
|
} else {
|
|
style = svg.querySelector('style');
|
|
}
|
|
|
|
//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]);
|
|
}
|
|
}
|
|
|
|
//Remove CSS
|
|
while (style.childNodes.length) {
|
|
style.removeChild(style.childNodes[0]);
|
|
}
|
|
|
|
setAttr(svg, {
|
|
'width': width,
|
|
'height': height,
|
|
'viewBox': '0 0 ' + width + ' ' + height,
|
|
'preserveAspectRatio': 'none'
|
|
});
|
|
|
|
return svg;
|
|
}
|
|
|
|
/**
|
|
* Returns serialized SVG with XML processing instructions
|
|
*
|
|
* @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;
|
|
|
|
//External stylesheets: Processing Instruction method
|
|
if (engineSettings.svgXMLStylesheet) {
|
|
var xml = createXML();
|
|
//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
|
|
//todo: remove in 2.7
|
|
/*
|
|
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);
|
|
}
|
|
|
|
var svgText = serializer.serializeToString(svg);
|
|
svgText = svgText.replace(/\&(\#[0-9]{2,}\;)/g, '&$1');
|
|
return svgCSS + svgText;
|
|
}
|
|
|
|
/**
|
|
* Creates a XML document
|
|
* @private
|
|
*/
|
|
function createXML() {
|
|
if (!global.DOMParser) return;
|
|
return new DOMParser().parseFromString('<xml />', 'application/xml');
|
|
}
|
|
|
|
/**
|
|
* 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) global.clearTimeout(App.vars.debounceTimer);
|
|
App.vars.debounceTimer = global.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);
|
|
});
|
|
}
|
|
|
|
//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: [],
|
|
invisibleImages: {},
|
|
invisibleId: 0,
|
|
visibilityCheckStarted: false,
|
|
debounceTimer: null,
|
|
cache: {},
|
|
dataAttr: 'data-src'
|
|
};
|
|
|
|
//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;
|
|
}
|
|
})();
|
|
|
|
//Starts checking for invisible placeholders
|
|
startVisibilityCheck();
|
|
|
|
if (onDomReady) {
|
|
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();
|
|
});
|
|
}
|
|
});
|
|
}
|
|
|
|
module.exports = Holder;
|