static/ext/src/class/Base.js
function(name, mixinClass) {
            var me = this,
                mixin = mixinClass.prototype,
                prototype = me.prototype,
                key, statics, i, ln, staticName,
                mixinValue, hookKey, hookFunction;

            if (typeof mixin.onClassMixedIn != 'undefined') {
                mixin.onClassMixedIn.call(mixinClass, me);
            }

            if (!prototype.hasOwnProperty('mixins')) {
                if ('mixins' in prototype) {
                    prototype.mixins = Ext.Object.chain(prototype.mixins);
                }
                else {
                    prototype.mixins = {};
                }
            }

            for (key in mixin) {
                mixinValue = mixin[key];
                if (key === 'mixins') {
                    Ext.merge(prototype.mixins, mixinValue);
                }
                else if (key === 'xhooks') {
                    for (hookKey in mixinValue) {
                        hookFunction = mixinValue[hookKey];

                        // Mixed in xhook methods cannot call a parent.
                        hookFunction.$previous = Ext.emptyFn;

                        if (prototype.hasOwnProperty(hookKey)) {

                            // Pass the hook function, and the existing function which it is to underride.
                            // The existing function has its $previous pointer replaced by a closure
                            // which calls the hookFunction and then the existing function's original $previous
                            hookFunctionFactory(hookFunction, prototype[hookKey], hookKey, me);
                        } else {
                            // There's no original function, so generate an implementation which calls
                            // the hook function. It will not get any $previous pointer.
                            prototype[hookKey] = hookFunctionFactory(hookFunction, null, hookKey, me);
                        }
                    }
                }
                else if (!(key === 'mixinId' || key === 'config') && (prototype[key] === undefined)) {
                    prototype[key] = mixinValue;
                }
            }

            //<feature classSystem.inheritableStatics>
            // Mixin statics inheritance
            statics = mixin.$inheritableStatics;

            if (statics) {
                for (i = 0, ln = statics.length; i < ln; i++) {
                    staticName = statics[i];

                    if (!me.hasOwnProperty(staticName)) {
                        me[staticName] = mixinClass[staticName];
                    }
                }
            }
            //</feature>

            //<feature classSystem.config>
            if ('config' in mixin) {
                me.addConfig(mixin.config, false);
            }
            //</feature>

            prototype.mixins[name] = mixin;
            return me;
        }
function(name, mixinClass) {
            var me = this,
                mixin = mixinClass.prototype,
                prototype = me.prototype,
                key, statics, i, ln, staticName,
                mixinValue, hookKey, hookFunction;

            if (typeof mixin.onClassMixedIn != 'undefined') {
                mixin.onClassMixedIn.call(mixinClass, me);
            }

            if (!prototype.hasOwnProperty('mixins')) {
                if ('mixins' in prototype) {
                    prototype.mixins = Ext.Object.chain(prototype.mixins);
                }
                else {
                    prototype.mixins = {};
                }
            }

            for (key in mixin) {
                mixinValue = mixin[key];
                if (key === 'mixins') {
                    Ext.merge(prototype.mixins, mixinValue);
                }
                else if (key === 'xhooks') {
                    for (hookKey in mixinValue) {
                        hookFunction = mixinValue[hookKey];

                        // Mixed in xhook methods cannot call a parent.
                        hookFunction.$previous = Ext.emptyFn;

                        if (prototype.hasOwnProperty(hookKey)) {

                            // Pass the hook function, and the existing function which it is to underride.
                            // The existing function has its $previous pointer replaced by a closure
                            // which calls the hookFunction and then the existing function's original $previous
                            hookFunctionFactory(hookFunction, prototype[hookKey], hookKey, me);
                        } else {
                            // There's no original function, so generate an implementation which calls
                            // the hook function. It will not get any $previous pointer.
                            prototype[hookKey] = hookFunctionFactory(hookFunction, null, hookKey, me);
                        }
                    }
                }
                else if (!(key === 'mixinId' || key === 'config') && (prototype[key] === undefined)) {
                    prototype[key] = mixinValue;
                }
            }

            //<feature classSystem.inheritableStatics>
            // Mixin statics inheritance
            statics = mixin.$inheritableStatics;

            if (statics) {
                for (i = 0, ln = statics.length; i < ln; i++) {
                    staticName = statics[i];

                    if (!me.hasOwnProperty(staticName)) {
                        me[staticName] = mixinClass[staticName];
                    }
                }
            }
            //</feature>

            //<feature classSystem.config>
            if ('config' in mixin) {
                me.addConfig(mixin.config, false);
            }
            //</feature>

            prototype.mixins[name] = mixin;
            return me;
        }
<feature classSystem.mixins> 
Used internally by the mixins pre-processor
@private
@static
@inheritable