如何在自定义MXML标签中填充必需的参数？

问题描述

限时删除！！

这里是类：

$ p $ package fnc {
import mx.containers.Canvas;

public class Deck extends Canvas {

protected var _chipCount：int;
$ b公共功能甲板（chipCount：int）{
/ *将一些筹码与这套牌相关联* /
_chipCount = chipCount;


public function get chipCount（）：int {
return _chipCount;

这里是MXML： p>

 <？xml version =1.0encoding =utf-8？> 
 < ns1：甲板horizo​​ntalCenter =0verticalCenter =0> 
< / ns1：甲板> 
< / mx：Application> 
  

运行此应用程序会出现此错误：

ArgumentError：错误＃1063：fnc :: Deck（）上的参数计数不匹配。预计1，在mx.core :: Container / createComponentFromDescriptor（）中得到0.
[C：\ autobuild \ 3.2.0 \ frameworks \projects\framework\src\mx\core \Container.as：3579]
在mx.core :: Container / createComponentsFromDescriptors（）[C：\ autobuild\3.2.0\frameworks\projects\framework\src\mx\\ \\ core \Container.as：3493]
在mx.core :: Container / createChildren（）[C：\ autobuild\3.2.0\frameworks\projects\framework\src\ mx.core ::Container.as：2589]
在mx.core :: UIComponent / initialize（）[C：\ autobuild\3.2.0\frameworks\projects\framework\src \mx\core\UIComponent.as：5370]
在mx.core :: Container / initialize（）[C：\ autobuild\3.2.0\frameworks\projects\framework\\ \\ src \mx\core\Container.as：2526]
在mx.core :: Application / initialize（）[C：\autobuild\3.2.0\framewor ks\projects\framework\src\mx\core\Application.as：846]
at Practice / initialize（）[C：\Documents and Settings\LocalService\My Documents\\ \\ Flex Builder 3 \Practice\src\Practice.mxml：0]
在mx.managers :: SystemManager / ：\autobuild\\ \ 3.2 \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\SystemManager.as:3234)
在mx.managers :: SystemManager / ：\autobuild \\ 3.2.0 \ frameworks \projects\framework\src\mx\managers\SystemManager.as：3064]
在mx.managers :: SystemManager / docFrameListener（）[C：\ autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\SystemManager.as：2916]

添加<$

   cC> chipCount =0 version =1.0encoding =utf-8？> 
 < ns1：甲板chipCount =0horizo​​ntalCenter =0verticalCenter =0> 
< / ns1：甲板> 
< / mx：Application> 
  

得到这个编译错误：

和描述路径资源位置创建时间Id
属性'chipCount'是只读的。练习/ src Practice.mxml第3行1242656555328 26

如何指定最初的筹码数量？

解决方案

在回答brd6644的评论：

 包
 {
 import mx.containers.Canvas; 
 
 public class Deck extends Canvas 
 {
 protected var _chipCount：int; 
 private var chipCountChanged：Boolean; 
 
 public function Deck（）
 {
 super（）; 
 
 
 public function set chipCount（value：int）：void 
 {
 if（chipCount！= value）
 {
 _chipCount =值; 
 chipCountChanged = true; 
 invalidateProperties（）; 
 //调用invalidateSize（）如果改变chipCount的值可能会改变你的组件的大小
 //调用invalidateDisplayList（）如果改变chipCount的值需要重绘你的组件
} 
 } 
 
 public function get chipCount（）：int 
 {
 return _chipCount; 
 
 
保护函数commitProperties（）：void 
 {
 super.commitProperties（）; 
 
 if（chipCountChanged）
 {
 chipCountChanged = false; 
 //这里更新由于chipCount新值而改变的属性。 
} 
} 
 
} 
} 
  

Here's the Class:

package fnc {
    import mx.containers.Canvas;

    public class Deck extends Canvas {

        protected var _chipCount:int;

        public function Deck(chipCount:int) {
            /* Associate some chips with this deck */
            _chipCount = chipCount;
        }

        public function get chipCount():int {
            return _chipCount;
        }
    }
}

Here's the MXML:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:ns1="fnc.*">
    <ns1:Deck horizontalCenter="0" verticalCenter="0">
    </ns1:Deck>
</mx:Application>

Running this application gets this error:

ArgumentError: Error #1063: Argument count mismatch on fnc::Deck(). Expected 1, got 0. at mx.core::Container/createComponentFromDescriptor()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3579] at mx.core::Container/createComponentsFromDescriptors()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:3493] at mx.core::Container/createChildren()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2589] at mx.core::UIComponent/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\UIComponent.as:5370] at mx.core::Container/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Container.as:2526] at mx.core::Application/initialize()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\core\Application.as:846] at Practice/initialize()[C:\Documents and Settings\LocalService\My Documents\Flex Builder 3\Practice\src\Practice.mxml:0] at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::childAdded()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\SystemManager.as:2009] at mx.managers::SystemManager/initializeTopLevelWindow()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\SystemManager.as:3234] at mx.managers::SystemManager/http://www.adobe.com/2006/flex/mx/internal::docFrameHandler()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\SystemManager.as:3064] at mx.managers::SystemManager/docFrameListener()[C:\autobuild\3.2.0\frameworks\projects\framework\src\mx\managers\SystemManager.as:2916]

Adding chipCount="0" to the MXML like this:

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" xmlns:ns1="fnc.*">
    <ns1:Deck chipCount="0" horizontalCenter="0" verticalCenter="0">
    </ns1:Deck>
</mx:Application>

Gets this compile error:

Severity and Description Path Resource Location Creation Time IdProperty 'chipCount' is read-only. Practice/src Practice.mxml line 3 1242656555328 26

How do I specify the initial chip count?

解决方案

In answer to brd6644 comment :

package
{
    import mx.containers.Canvas;

    public class Deck extends Canvas
    {
        protected var _chipCount:int;
        private var chipCountChanged:Boolean;

        public function Deck()
        {
            super();
        }

        public function set chipCount(value:int):void
        {
            if (chipCount != value)
            {
                _chipCount = value;
                chipCountChanged = true;
                invalidateProperties();
                //call invalidateSize() if changing chipCount value may change the size of your component
                //call invalidateDisplayList() if changing chipCount value need a redraw of your component
            }
        }

        public function get chipCount():int
        {
            return _chipCount;
        }

        override protected function commitProperties():void
        {
            super.commitProperties();

            if (chipCountChanged)
            {
                chipCountChanged = false;
                //here update properties that change because of chipCount new value.
            }
        }

    }
}

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