/**
* @license
* Copyright The Closure Library Authors.
* SPDX-License-Identifier: Apache-2.0
*/
/**
* @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() {
'use strict';
if (goog.userAgent.WEBKIT) {
return 'Webkit';
} else if (goog.userAgent.GECKO) {
return 'Moz';
} else if (goog.userAgent.IE) {
return 'ms';
}
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() {
'use strict';
if (goog.userAgent.WEBKIT) {
return '-webkit';
} else if (goog.userAgent.GECKO) {
return '-moz';
} else if (goog.userAgent.IE) {
return '-ms';
}
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) {
'use strict';
// 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 (opt_object === undefined || 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) {
'use strict';
var prefix = goog.dom.vendor.getVendorJsPrefix() || '';
return (prefix + eventType).toLowerCase();
};