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/* Copyright (c) 2006-2013 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the 2-clause BSD license.
* See license.txt in the OpenLayers distribution or repository for the
* full text of the license. */
/**
* @requires OpenLayers/SingleFile.js
*/
OpenLayers.Util = OpenLayers.Util || {};
/**
* Namespace: OpenLayers.Util.vendorPrefix
* A collection of utility functions to detect vendor prefixed features
*/
OpenLayers.Util.vendorPrefix = (function() {
"use strict";
var VENDOR_PREFIXES = ["", "O", "ms", "Moz", "Webkit"],
divStyle = document.createElement("div").style,
cssCache = {},
jsCache = {};
/**
* Function: domToCss
* Converts a upper camel case DOM style property name to a CSS property
* i.e. transformOrigin -> transform-origin
* or WebkitTransformOrigin -> -webkit-transform-origin
*
* Parameters:
* prefixedDom - {String} The property to convert
*
* Returns:
* {String} The CSS property
*/
function domToCss(prefixedDom) {
if (!prefixedDom) { return null; }
return prefixedDom.
replace(/([A-Z])/g, function(c) { return "-" + c.toLowerCase(); }).
replace(/^ms-/, "-ms-");
}
/**
* APIMethod: css
* Detect which property is used for a CSS property
*
* Parameters:
* property - {String} The standard (unprefixed) CSS property name
*
* Returns:
* {String} The standard CSS property, prefixed property or null if not
* supported
*/
function css(property) {
if (cssCache[property] === undefined) {
var domProperty = property.
replace(/(-[\s\S])/g, function(c) { return c.charAt(1).toUpperCase(); });
var prefixedDom = style(domProperty);
cssCache[property] = domToCss(prefixedDom);
}
return cssCache[property];
}
/**
* APIMethod: js
* Detect which property is used for a JS property/method
*
* Parameters:
* obj - {Object} The object to test on
* property - {String} The standard (unprefixed) JS property name
*
* Returns:
* {String} The standard JS property, prefixed property or null if not
* supported
*/
function js(obj, property) {
if (jsCache[property] === undefined) {
var tmpProp,
i = 0,
l = VENDOR_PREFIXES.length,
prefix,
isStyleObj = (typeof obj.cssText !== "undefined");
jsCache[property] = null;
for(; i<l; i++) {
prefix = VENDOR_PREFIXES[i];
if(prefix) {
if (!isStyleObj) {
// js prefix should be lower-case, while style
// properties have upper case on first character
prefix = prefix.toLowerCase();
}
tmpProp = prefix + property.charAt(0).toUpperCase() + property.slice(1);
} else {
tmpProp = property;
}
if(obj[tmpProp] !== undefined) {
jsCache[property] = tmpProp;
break;
}
}
}
return jsCache[property];
}
/**
* APIMethod: style
* Detect which property is used for a DOM style property
*
* Parameters:
* property - {String} The standard (unprefixed) style property name
*
* Returns:
* {String} The standard style property, prefixed property or null if not
* supported
*/
function style(property) {
return js(divStyle, property);
}
return {
css: css,
js: js,
style: style,
// used for testing
cssCache: cssCache,
jsCache: jsCache
};
}());
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