/*!* jQuery UI Widget 1.8.1** Copyright (c) 2010 AUTHORS.txt (http://jqueryui.com/about)* Dual licensed under the MIT (MIT-LICENSE.txt)* and GPL (GPL-LICENSE.txt) licenses.** http://docs.jquery.com/UI/Widget*/
(function( $ ) {var _remove = $.fn.remove;$.fn.remove = function( selector, keepData ) {return this.each(function() {if ( !keepData ) {if ( !selector || $.filter( selector, [ this ] ).length ) {$( "*", this ).add( this ).each(function() {$( this ).triggerHandler( "remove" );});}}//dom元素在被删除前，触发一下remove事件，jquery框架本身没有对元素删除绑定事件return _remove.call( $(this), selector, keepData );});
};$.widget = function( name, base, prototype ) {var namespace = name.split( "." )[ 0 ],fullName;name = name.split( "." )[ 1 ];fullName = namespace + "-" + name;//比如ui.tab,上面的name='tab';fullName='ui-tab';if ( !prototype ) {prototype = base;base = $.Widget;}//如果没有prototype,那么prototype就是base参数,实际base默认为$.Widget// create selector for plugin$.expr[ ":" ][ fullName ] = function( elem ) {return !!$.data( elem, name );};$[ namespace ] = $[ namespace ] || {};//是否有命名空间$[ namespace ][ name ] = function( options, element ) {//根据上面的例子，即初始化了$.ui.tab=func// allow instantiation without initializing for simple inheritanceif ( arguments.length ) {this._createWidget( options, element );}};var basePrototype = new base();//初始化，一般都是调用了new $.Widget()// we need to make the options hash a property directly on the new instance// otherwise we'll modify the options hash on the prototype that we're// inheriting from
//    $.each( basePrototype, function( key, val ) {//        if ( $.isPlainObject(val) ) {//            basePrototype[ key ] = $.extend( {}, val );
//        }
//    });basePrototype.options = $.extend( {}, basePrototype.options );//初始化options值，注意不需要深度拷贝$[ namespace ][ name ].prototype = $.extend( true, basePrototype, {namespace: namespace,widgetName: name,widgetEventPrefix: $[ namespace ][ name ].prototype.widgetEventPrefix || name,widgetBaseClass: fullName}, prototype );//为新的ui模块创建原型，使用深度拷贝，在basePrototype上扩展一些模块基本信息，在扩展prototype,比如ui.tabs.js中就是tab的拥有各种方法的大对象
 $.widget.bridge( name, $[ namespace ][ name ] );//将此方法挂在jQuery对象上
};$.widget.bridge = function( name, object ) {$.fn[ name ] = function( options ) {var isMethodCall = typeof options === "string",args = Array.prototype.slice.call( arguments, 1 ),returnValue = this;//如果第一个参数是string类型，就认为是调用模块方法//剩下的参数作为方法的参数，后面会用到// allow multiple hashes to be passed on initoptions = !isMethodCall && args.length ?$.extend.apply( null, [ true, options ].concat(args) ) :options;//可以简单认为是$.extend(true,options,args[0],...),args可以是一个参数或是数组// prevent calls to internal methodsif ( isMethodCall && options.substring( 0, 1 ) === "_" ) {return returnValue;}//开头带下划线的方法都是私有方法，不让调用if ( isMethodCall ) {//如果是调用函数this.each(function() {var instance = $.data( this, name ),//得到实例，实例作为一个数据和元素关联上methodValue = instance && $.isFunction( instance[options] ) ?instance[ options ].apply( instance, args ) ://如果实例和方法均存在，调用方法，把args作为参数传进去instance;//否则返回undefinedif ( methodValue !== instance && methodValue !== undefined ) {//如果methodValue不是jquery对象也不是undefinedreturnValue = methodValue;return false;//跳出each，一般获取options的值会走这个分支
                }});} else {//不是函数调用的话this.each(function() {var instance = $.data( this, name );if ( instance ) {//实例存在if ( options ) {//有参数instance.option( options );//调用option函数，一般是设置状态之类的操作
                    }instance._init();//再次调用此函数，根据options调整} else {$.data( this, name, new object( options, this ) );//没有实例的话，给元素绑定一个实例。注意这里的this是dom，object是模块类
                }});}return returnValue;//返回，有可能是jquery对象，有可能是其他值
    };
};$.Widget = function( options, element ) {//所有模块的基类// allow instantiation without initializing for simple inheritanceif ( arguments.length ) {//如果有参数，调用初始化函数this._createWidget( options, element );}
};$.Widget.prototype = {widgetName: "widget",widgetEventPrefix: "",options: {disabled: false},//上面的属性会在创建模块时被覆盖_createWidget: function( options, element ) {// $.widget.bridge stores the plugin instance, but we do it anyway// so that it's stored even before the _create function runsthis.element = $( element ).data( this.widgetName, this );//缓存实例，保存jquery对象this.options = $.extend( true, {},this.options,$.metadata && $.metadata.get( element )[ this.widgetName ],options );//参数处理var self = this;this.element.bind( "remove." + this.widgetName, function() {self.destroy();});//注册销毁事件this._create();//创建this._init();//初始化
    },_create: function() {},_init: function() {},destroy: function() {//销毁模块：去除绑定事件、去除数据、去除样式、属性this.element.unbind( "." + this.widgetName ).removeData( this.widgetName );this.widget().unbind( "." + this.widgetName ).removeAttr( "aria-disabled" ).removeClass(this.widgetBaseClass + "-disabled " +"ui-state-disabled" );},widget: function() {//返回jquery对象return this.element;},option: function( key, value ) {//设置选项函数var options = key,self = this;if ( arguments.length === 0 ) {// don't return a reference to the internal hashreturn $.extend( {}, self.options );//返回一个新的对象，不是内部数据的引用
        }if  (typeof key === "string" ) {if ( value === undefined ) {return this.options[ key ];//取值
            }options = {};options[ key ] = value;//设置值
        }$.each( options, function( key, value ) {self._setOption( key, value );//调用内部的_setOption
        });return self;},_setOption: function( key, value ) {this.options[ key ] = value;if ( key === "disabled" ) {//增加或是去除classNamethis.widget()[ value ? "addClass" : "removeClass"](this.widgetBaseClass + "-disabled" + " " +"ui-state-disabled" ).attr( "aria-disabled", value );}return this;},enable: function() {return this._setOption( "disabled", false );},disable: function() {return this._setOption( "disabled", true );},_trigger: function( type, event, data ) {var callback = this.options[ type ];event = $.Event( event );event.type = ( type === this.widgetEventPrefix ?type :this.widgetEventPrefix + type ).toLowerCase();data = data || {};// copy original event properties over to the new event// this would happen if we could call $.event.fix instead of $.Event// but we don't have a way to force an event to be fixed multiple timesif ( event.originalEvent ) {//把原始的event属性重新赋到event变量上for ( var i = $.event.props.length, prop; i; ) {prop = $.event.props[ --i ];event[ prop ] = event.originalEvent[ prop ];}}this.element.trigger( event, data );return !( $.isFunction(callback) &&callback.call( this.element[0], event, data ) === false ||event.isDefaultPrevented() );}
};})( jQuery );