Function Class

src/utils/Class.js:178–249

* `Phaser.Class` is the ES5-style class factory used throughout the Phaser framework to define * classes with prototype-based inheritance. It provides a consistent pattern for creating * classes and is the foundation on which most Phaser Game Objects and systems are built. * * Pass a plain objec

(definition)

 *      });
 */
function Class (definition)
{
    if (!definition)
    {
        definition = {};
    }

    //  The variable name here dictates what we see in Chrome debugger
    var initialize;
    var Extends;

    if (definition.initialize)
    {
        if (typeof definition.initialize !== 'function')
        {
            throw new Error('initialize must be a function');
        }

        initialize = definition.initialize;

        //  Usually we should avoid 'delete' in V8 at all costs.
        //  However, its unlikely to make any performance difference
        //  here since we only call this on class creation (i.e. not object creation).
        delete definition.initialize;
    }
    else if (definition.Extends)
    {
        var base = definition.Extends;

        initialize = function ()
        {
            base.apply(this, arguments);
        };
    }
    else
    {
        initialize = function () {};
    }

    if (definition.Extends)
    {
        initialize.prototype = Object.create(definition.Extends.prototype);
        initialize.prototype.constructor = initialize;

        //  For getOwnPropertyDescriptor to work, we need to act directly on the Extends (or Mixin)

        Extends = definition.Extends;

        delete definition.Extends;
    }
    else
    {
        initialize.prototype.constructor = initialize;
    }

    //  Grab the mixins, if they are specified...
    var mixins = null;