在ActionScript中动态创建Flex组件

在ActionScript中动态创建Flex组件

本文介绍了在ActionScript中动态创建Flex组件的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

是不是有一些方法可以重写下面的代码,这样我就不需要每一个可以想象的类型的巨大的switch语句了?另外,如果我可以用某种方式替换switch语句来动态地创建新的控件,那么我可以使代码更小,更直接,而且不必预测自定义控件类型的可能性。

之前:

 <?xml version =1.0encoding =utf-8 ?> 
layout =vertical>
< mx:Script>
<![CDATA [
import mx.containers.HBox;
导入mx.controls.Button;
导入mx.controls.Label;
public function CreateControl(event:Event):void {
var Type:String = Edit.text;
var NewControl:Object;

switch(Type){
'mx.controls :: Label':NewControl = new Label(); break;
case'mx.controls :: Button':NewControl = new Button(); break;
case'mx.containers :: HBox':NewControl = new HBox(); break;
...所有其他类型,包括不可预见的自定义类型

$ b this.addChild(NewControl as DisplayObject);
}
]]>
< / mx:Script>
< mx:TextInput id =Edit/>
< mx:Button label =Createclick =CreateControl(event);/>
< / mx:WindowedApplication>

后:

 <?xml version =1.0encoding =utf-8?> 
layout =vertical>
< mx:Script>
<![CDATA [
import mx.containers.HBox;
导入mx.controls.Button;
导入mx.controls.Label;
public function CreateControl(event:Event):void {
var Type:String = Edit.text;

var NewControl:Object = * ??? *(Type);

this.addChild(NewControl as DisplayObject);
}
]]>
< / mx:Script>
< mx:TextInput id =Edit/>
< mx:Button label =Createclick =CreateControl(event);/>
< / mx:WindowedApplication>


解决方案
请看flash.utils.getDefinitionByName() 。



我还没有运行这个代码,但是你应该可以按照

<$ p公共函数CreateControl(event:Event):void {
var Type:String = Edit.text;
var controlClass:Class = getDefinitionByName(Type)as Class;

var NewControl:Object = new controlClass();

this.addChild(NewControl as DisplayObject);
}


Isn't there some way to re-write the following code, such that I don't need a gigantic switch statement with every conceivable type? Also, if I can replace the switch statement with some way to dynamically create new controls, then I can make the code smaller, more direct, and don't have to anticipate the possibility of custom control types.

Before:

<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml"
  layout="vertical">
  <mx:Script>
    <![CDATA[
      import mx.containers.HBox;
      import mx.controls.Button;
      import mx.controls.Label;
      public function CreateControl(event:Event):void {
        var Type:String=Edit.text;
        var NewControl:Object;

        switch (Type) {
          case 'mx.controls::Label':NewControl=new Label();break;
          case 'mx.controls::Button':NewControl=new Button();break;
          case 'mx.containers::HBox':NewControl=new HBox();break;
          ... every other type, including unforeseeable custom types
        }

        this.addChild(NewControl as DisplayObject);
      }
    ]]>
  </mx:Script>
  <mx:Label text="Control Type"/>
  <mx:TextInput id="Edit"/>
  <mx:Button label="Create" click="CreateControl(event);"/>
</mx:WindowedApplication>

AFTER:

<?xml version="1.0" encoding="utf-8"?>
<mx:WindowedApplication xmlns:mx="http://www.adobe.com/2006/mxml"
  layout="vertical">
  <mx:Script>
    <![CDATA[
      import mx.containers.HBox;
      import mx.controls.Button;
      import mx.controls.Label;
      public function CreateControl(event:Event):void {
        var Type:String=Edit.text;

        var NewControl:Object= *???*(Type);

        this.addChild(NewControl as DisplayObject);
      }
    ]]>
  </mx:Script>
  <mx:Label text="Control Type"/>
  <mx:TextInput id="Edit"/>
  <mx:Button label="Create" click="CreateControl(event);"/>
</mx:WindowedApplication>
解决方案

Take a look at flash.utils.getDefinitionByName().

I haven't run this code, but you should be able to do something along the lines of

public function CreateControl(event:Event):void {
    var Type:String=Edit.text;
    var controlClass:Class = getDefinitionByName(Type) as Class;

    var NewControl:Object= new controlClass();

    this.addChild(NewControl as DisplayObject);
}

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09-02 13:23