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// Copyright 2012 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Vendor prefix getters.
*/
goog.provide('goog.dom.vendor');
goog.require('goog.string');
goog.require('goog.userAgent');
/**
* Returns the JS vendor prefix used in CSS properties. Different vendors
* use different methods of changing the case of the property names.
*
* @return {?string} The JS vendor prefix or null if there is none.
*/
goog.dom.vendor.getVendorJsPrefix = function() {
if (goog.userAgent.WEBKIT) {
return 'Webkit';
} else if (goog.userAgent.GECKO) {
return 'Moz';
} else if (goog.userAgent.IE) {
return 'ms';
} else if (goog.userAgent.OPERA) {
return 'O';
}
return null;
};
/**
* Returns the vendor prefix used in CSS properties.
*
* @return {?string} The vendor prefix or null if there is none.
*/
goog.dom.vendor.getVendorPrefix = function() {
if (goog.userAgent.WEBKIT) {
return '-webkit';
} else if (goog.userAgent.GECKO) {
return '-moz';
} else if (goog.userAgent.IE) {
return '-ms';
} else if (goog.userAgent.OPERA) {
return '-o';
}
return null;
};
/**
* @param {string} propertyName A property name.
* @param {!Object=} opt_object If provided, we verify if the property exists in
* the object.
* @return {?string} A vendor prefixed property name, or null if it does not
* exist.
*/
goog.dom.vendor.getPrefixedPropertyName = function(propertyName, opt_object) {
// We first check for a non-prefixed property, if available.
if (opt_object && propertyName in opt_object) {
return propertyName;
}
var prefix = goog.dom.vendor.getVendorJsPrefix();
if (prefix) {
prefix = prefix.toLowerCase();
var prefixedPropertyName = prefix + goog.string.toTitleCase(propertyName);
return (!goog.isDef(opt_object) || prefixedPropertyName in opt_object) ?
prefixedPropertyName :
null;
}
return null;
};
/**
* @param {string} eventType An event type.
* @return {string} A lower-cased vendor prefixed event type.
*/
goog.dom.vendor.getPrefixedEventType = function(eventType) {
var prefix = goog.dom.vendor.getVendorJsPrefix() || '';
return (prefix + eventType).toLowerCase();
};
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