83 lines
2.3 KiB
JavaScript
83 lines
2.3 KiB
JavaScript
/**
|
|
* Contains fallback visibility object factory
|
|
*
|
|
* Copyright (C) 2010 Mike Gerwitz
|
|
*
|
|
* This file is part of ease.js.
|
|
*
|
|
* ease.js is free software: you can redistribute it and/or modify it under the
|
|
* terms of the GNU Lesser General Public License as published by the Free
|
|
* Software Foundation, either version 3 of the License, or (at your option)
|
|
* any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
|
|
* for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
* @author Mike Gerwitz
|
|
*/
|
|
|
|
|
|
/**
|
|
* Initializes fallback visibility object factory
|
|
*
|
|
* Unlike the standard visibility object, fallback does not create various
|
|
* layers. This is for the simple fact that setting a value on one of the layers
|
|
* is not visible to layers beneath it (its prototypes). Fallback is necessary
|
|
* if proxy support or emulation (via ES5 getters/setters) is unavailable.
|
|
*/
|
|
module.exports = exports = function FallbackVisibilityObjectFactory()
|
|
{
|
|
// permit omitting 'new' keyword
|
|
if ( !( this instanceof exports ) )
|
|
{
|
|
return new exports();
|
|
}
|
|
};
|
|
|
|
|
|
/**
|
|
* "Inherit" from VisibilityObjectFactory
|
|
*/
|
|
exports.prototype = require( __dirname + '/VisibilityObjectFactory' )();
|
|
|
|
|
|
/**
|
|
* Do not create private visibility layer
|
|
*
|
|
* We're likely falling back because we cannot properly support the private
|
|
* visibility layer. Therefore, it will be omitted.
|
|
*
|
|
* @param {Object} atop_of will be returned, unmodified
|
|
* @param {Object} properties ignored
|
|
*
|
|
* @return {Object} provided object with no additional layer
|
|
*/
|
|
exports.prototype._createPrivateLayer = function( atop_of, properties )
|
|
{
|
|
return atop_of;
|
|
};
|
|
|
|
|
|
/**
|
|
* Does not create property proxy
|
|
*
|
|
* The fallback implementation is used because proxies are not supported and
|
|
* cannot be emulated with getters/setters.
|
|
*
|
|
* @param {Object} base will be returned, unmodified
|
|
* @param {Object} dest ignored
|
|
* @param {Object} props ignored
|
|
*
|
|
* @return {Object} given base
|
|
*/
|
|
exports.prototype.createPropProxy = function( base, dest, props )
|
|
{
|
|
return base;
|
|
};
|
|
|