在 Flex 中的组件之间共享数据的最佳方式是什么? [英] What's the best way to share data between components in Flex?

问题描述

我有一个 Flex 应用程序，我正在为一份新工作工作.这是一个训练轮应用程序——我正在学习语言，这不是一个需要与服务对话才能完成工作的应用程序.整个应用程序中有几个组合框实例共享相同的一组可能值(例如，一组状态:进行中"、拒绝"、完成")，我希望使用相同的数据源.

I have a Flex application that I'm working on for a new job. It's sort of a training wheels application -- I'm learning the language, and this isn't an app that needs to talk to a service in order to do its job. There are a few instances of combo boxes throughout the application that share the same set of possible values (say, a selection of states: "In Progress", "Rejected", "Complete") that I want to have use the same data source.

管理此问题的最佳方法是什么?

What is the best way to manage this?

推荐答案

MVC 架构 ....在简单的情况下只是模型部分:

MVC architecture ....well in simple cases just the Model part:

package 
{


    [Bindable]
    public final class ShellModelSingleton
    {   


        public var selectedStatus:ArrayCollection;




        ////////////////////////////////////////////
        // CONSTRUCTOR
        // ****DO NOT MODIFY BELOW THIS LINE*******
        /////////////////////////////////////////// 
        public function ShellModelSingleton(){}

        /****************************************************************
         * Singleton logic - this makes sure only 1 instance is created
         * Note: you are able to hack this since the constructor doesn't limit 
             * a single instance
         * so make sure the getInstance function is used instead of new 
             * ShellModelSingleton()
         *****************************************************************/ 
        public static function getInstance():ShellModelSingleton {
            if(_instance == null) {
                _instance = new ShellModelSingleton();
            }
            return _instance;
        }

        protected static var _instance:ShellModelSingleton;
    }

}

然后你可以像这样从任何组件更新和使用单例:

Then you can update and use the singleton from any component like this:

[Bindable] private var model:ShellModelSingleton = 
                              ShellModelSingleton.getInstance();

组件 1

<mx:DataGrid id="myDG" dataProvider="{model.selectedStatus}" />

组件 2

   <mx:List id="myList" dataProvider="{model.selectedStatus}" 
      labelField="label" />

然后，您对 selectedStatus 集合所做的任何更改都将在两个组件中更新.

Then any changes you make to the selectedStatus collection will be updated in both components.

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