[英]Creating Flex components from XML
我有一个XML,它有一个属性选项或组合框,解析我需要在flex中动态创建组件。
Viatropos提供了很棒的代码,但是我无法执行它……任何人都可以产生它……谢谢
您可以使用以下方法在Flex中动态创建组件:
样本数据
<?xml version="1.0" encoding="UTF-8"?>
<components type="array">
<component type="mx.controls.ComboBox">
<width>100</width>
<height>100</height>
<color isStyle="true">0xff0000</color>
<prompt>Im a Combo Box!</prompt>
</component>
<component type="mx.controls.Button">
<width>100</width>
<height>100</height>
<color isStyle="true">0xff0000</color>
<label>Im a Button!</label>
</component>
</components>
示例应用程序 :
<?xml version="1.0" encoding="utf-8"?>
<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml"
creationComplete="creationCompleteHandler()">
<mx:Script>
<![CDATA[
import flash.display.DisplayObject;
import mx.core.UIComponent;
import mx.controls.ComboBox; ComboBox;
protected function creationCompleteHandler():void
{
var components:Array = getComponentsFromXML(xml.component);
var i:int = 0;
var n:int = components.length;
for (i; i < n; i++)
{
panel.addChild(components[i] as DisplayObject);
}
}
/**
* Parses an XML string, returns array of new components.
*/
public function getComponentsFromXML(components:XMLList):Array
{
var result:Array = [];
var child:Object;
var component:UIComponent;
var type:String;
var clazz:Class;
var i:int = 0;
var n:int = components.length();
for (i; i < n; i++)
{
child = components[i];
type = child.@type;
try {
clazz = flash.utils.getDefinitionByName(type) as Class;
} catch (error:ReferenceError) {
traceImportError(type);
}
component = new clazz(); // dynamic
var properties:XMLList = child.elements();
var property:XML;
var name:String;
var value:Object;
// for each child node
for each (property in properties)
{
name = property.localName();
value = property.toString();
// create a more generic method to convert
// strings to numbers and whatnot
// this is a regular expression matching any digit
// check out rubular.com
if (/\d+/.test(value.toString()))
value = Number(value);
if (property.attribute("isStyle") == "true")
component.setStyle(name, value);
else
component[name] = value;
}
result.push(component);
}
return result;
}
protected function traceImportError(type:String):void
{
trace("Please include the class '" + type + "' in the swf.");
var names:Array = type.split(".");
var last:String = names[names.length - 1];
trace("import " + type + "; " + last + ";");
}
]]>
</mx:Script>
<!-- sample data -->
<mx:XML id="xml" source="components.xml" />
<!-- sample container -->
<mx:Panel id="panel" width="100%" height="100%"/>
</mx:Application>
只要您具有XML的定义结构,就可以创建一个XMLUtil以通用地处理xml(例如,获取所有属性,或将字符串转换为正确的类型),以及一个ComponentManifest类,该类获取XML文件并将其转换成组件。
您还需要确保将XML中定义的所有类都导入到swf中,否则它将引发该错误。 您可以这样做:
import mx.controls.ComboBox; ComboBox;
没有第二个ComboBox
直接导入将无法完成。
这应该使您入门,并根据需要填写!
这是@viatropos解决方案的修改版本:
样本数据:
<?xml version="1.0" encoding="UTF-8"?>
<components type="array">
<component type="mx.controls::ComboBox">
<width>100</width>
<height>100</height>
<color isStyle="true">"0xff0000"</location>
<label>"Im a Combo Box!"</label>
</component>
<component type="mx.controls::Button">
<width>100</width>
<height>100</height>
<color isStyle="true">"0xff0000"</location>
<label>"Im a Button!"</label>
</component>
</components>
显然,在此处使用了结束标签的地方有一个错误。
我还在所有字符串值周围添加了引号,以使其更容易识别。
样本(伪)方法: createComponentsFromXML(xml.components)
public function createComponentsFromXML(components:XMLList):void
{
var child:Object;
var component:UIComponent;
var i:int = 0;
var n:int = components.length();
for (i; i < n; i++)
{
child = components[i];
var clazz:Class = flash.utils.getDefinitionByName(child.@type);
component = new clazz(); // dynamic
var property:Object;
var value:Object;
var useIntVal:Boolean;
var intVal:int;
// for each child node
for (property in child.children())
{
useIntVal = false;
value = property.toString();
if(!(value.substr(1, 2) == '"' AND value.substr(-1, value.length()) == '"')) {
useIntVal = true;
intVal = parseInt(value);
}
// button["width"] = 100;
if (property.attribute("isStyle") == "true")
if(useIntVal) {
component.setStyle(property.localName(), intVal);
} else {
component.setStyle(property.localName(), value);
}
else {
if(useIntVal) {
component[property.localName()] = intVal;
} else {
component[property.localName()] = value;
}
}
}
}
}
我实现了对int的转换,以确保检查属性应为字符串还是int。
PS:我现在没有安装Flex,因此您可能会发现一些需要纠正的错误。
在这种情况下,您可能需要这样的XML:
<?xml version="1.0" encoding="UTF-8"?>
<components type="array">
<component type="mx.controls::ComboBox">
<properties>
<width>100</width>
<height>100</height>
<color isStyle="true">"0xff0000"</location>
<label>"Im a Combo Box!"</label>
</properties>
</component>
<component type="mx.controls::Button">
<properties>
<width>100</width>
<height>100</height>
<color isStyle="true">"0xff0000"</location>
<label>"Im a Button!"</label>
</properties>
<children>
<!--other children here-->
</children>
</component>
</components>
因为我怀疑您可以在手风琴中进行一层嵌套来完成很多工作。
我将留给您实现该功能。
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