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holder.js
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/*!
Holder - client side image placeholders
Version 2.6.0-pre+3hl5m
© 2015 Ivan Malopinsky - http://imsky.co
Site: http://holderjs.com
Issues: https://github.com/imsky/holder/issues
License: http://opensource.org/licenses/MIT
*/
(function webpackUniversalModuleDefinition(root, factory) {
if(typeof exports === 'object' && typeof module === 'object')
module.exports = factory();
else if(typeof define === 'function' && define.amd)
define(factory);
else if(typeof exports === 'object')
exports["Holder"] = factory();
else
root["Holder"] = factory();
})(this, function() {
return /******/ (function(modules) { // webpackBootstrap
/******/ // The module cache
/******/ var installedModules = {};
/******/ // The require function
/******/ function __webpack_require__(moduleId) {
/******/ // Check if module is in cache
/******/ if(installedModules[moduleId])
/******/ return installedModules[moduleId].exports;
/******/ // Create a new module (and put it into the cache)
/******/ var module = installedModules[moduleId] = {
/******/ exports: {},
/******/ id: moduleId,
/******/ loaded: false
/******/ };
/******/ // Execute the module function
/******/ modules[moduleId].call(module.exports, module, module.exports, __webpack_require__);
/******/ // Flag the module as loaded
/******/ module.loaded = true;
/******/ // Return the exports of the module
/******/ return module.exports;
/******/ }
/******/ // expose the modules object (__webpack_modules__)
/******/ __webpack_require__.m = modules;
/******/ // expose the module cache
/******/ __webpack_require__.c = installedModules;
/******/ // __webpack_public_path__
/******/ __webpack_require__.p = "";
/******/ // Load entry module and return exports
/******/ return __webpack_require__(0);
/******/ })
/************************************************************************/
/******/ ([
/* 0 */
/***/ function(module, exports, __webpack_require__) {
/* WEBPACK VAR INJECTION */(function(global) {/*
Holder.js - client side image placeholders
© 2012-2015 Ivan Malopinsky - http://imsky.co
*/
//Libraries and functions
var onDomReady = __webpack_require__(1);
var SceneGraph = __webpack_require__(2);
var utils = __webpack_require__(3);
var extend = utils.extend;
var cssProps = utils.cssProps;
var encodeHtmlEntity = utils.encodeHtmlEntity;
var decodeHtmlEntity = utils.decodeHtmlEntity;
var imageExists = utils.imageExists;
var getNodeArray = utils.getNodeArray;
var dimensionCheck = utils.dimensionCheck;
//Constants and definitions
var SVG_NS = 'http://www.w3.org/2000/svg';
var NODE_TYPE_COMMENT = 8;
var version = '%version%';
var generatorComment = '\n' +
'Created with Holder.js ' + version + '.\n' +
'Learn more at http://holderjs.com\n' +
'(c) 2012-2015 Ivan Malopinsky - http://imsky.co\n';
var Holder = {
version: version,
/**
* Adds a theme to default settings
*
* @param {string} name Theme name
* @param {Object} theme Theme object, with foreground, background, size, font, and fontweight properties.
*/
addTheme: function(name, theme) {
name != null && theme != null && (App.settings.themes[name] = theme);
delete App.vars.cache.themeKeys;
return this;
},
/**
* Appends a placeholder to an element
*
* @param {string} src Placeholder URL string
* @param {string} el Selector of target element(s)
*/
addImage: function(src, el) {
var node = document.querySelectorAll(el);
if (node.length) {
for (var i = 0, l = node.length; i < l; i++) {
var img = newEl('img');
setAttr(img, {
'data-src': src
});
node[i].appendChild(img);
}
}
return this;
},
/**
* Sets whether or not an image is updated on resize.
* If an image is set to be updated, it is immediately rendered.
*
* @param {Object} el Image DOM element
* @param {Boolean} value Resizable update flag value
*/
setResizeUpdate: function(el, value) {
if (el.holderData) {
el.holderData.resizeUpdate = !!value;
if (el.holderData.resizeUpdate) {
updateResizableElements(el);
}
}
},
/**
* 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++) {
//Skip processing background nodes if getComputedStyle is unavailable, since only modern browsers would be able to use canvas or SVG to render to background
if (!global.getComputedStyle) continue;
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;
}
};
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$/
},
textmode: {
regex: /textmode\:(.*)/,
output: function(val) {
return this.regex.exec(val)[1];
}
},
random: {
regex: /^random$/
},
size: {
regex: /size\:(\d+)/,
output: function(val) {
return this.regex.exec(val)[1];
}
}
}
};
/**
* 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.size.match(flag)) {
ret.size = App.flags.size.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;
//todo consider using all renderSettings in holderData
el.holderData = {
flags: flags,
engineSettings: engineSettings
};
if (mode == 'image' || mode == 'fluid') {
setAttr(el, {
'alt': (theme.text ? theme.text + ' [' + dimensionsCaption + ']' : dimensionsCaption)
});
}
var renderSettings = {
mode: mode,
el: el,
holderSettings: {
dimensions: dimensions,
theme: theme,
flags: flags
},
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(renderSettings);
if (flags.textmode == 'exact') {
el.holderData.resizeUpdate = true;
App.vars.resizableImages.push(el);
updateResizableElements(el);
}
}
} else if (mode == 'background' && engineSettings.renderer != 'html') {
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
*/