[英]Flex 4 disptaching custom event from custom component
這類似於這里提出的問題。 我正在調度自定義事件“ ShopEvent”,但出現錯誤“類型強制失敗:無法將flash.events::Event@81ecb79轉換為com.events.ShopEvent”
注意:從父自定義組件(第3個代碼段)拋出了錯誤,我在那里添加了更多詳細信息
這是我的自定義事件。 看到第一個常量,我將事件名稱復制粘貼到自定義組件中。
package com.events
{
import flash.events.Event;
public class ShopEvent extends Event
{
public static var MENU_SELECTED:String = "menuSelected";
public static var SUBMENU_SELECTED:String = "submenuSelected";
public static var ITEM_SELECTED:String = "itemSelected";
public static var NAV_NEXT:String = "navNext";
public static var NAV_PREVIOUS:String = "navPrevious";
public static var NAV_LAST:String = "navLast";
public static var NAV_FIRST:String = "navFirst";
public static var CLOSE:String = "close";
public var menuIdx:int;
//public var menuType:String;
public var menuId:int;
public var menuName:String;
public var itemId:int;
public function ShopEvent(type:String, bubbles:Boolean=false, cancelable:Boolean=false)
{
super(type, bubbles, cancelable);
}
}
}
自定義組件。 檢查元數據標簽。 活動已正確注冊
<?xml version="1.0" encoding="utf-8"?>
<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx" width="72" height="82"
mouseChildren="false"
creationComplete="init()"
click="onClick()"
buttonMode="true">
<s:layout>
<s:VerticalLayout horizontalAlign="center"/>
</s:layout>
<fx:Script>
<![CDATA[
import com.events.ShopEvent;
import mx.controls.Image;
public var menuId:int;
[Bindable]
public var menuText:String;
[Bindable]
public var bmp:Bitmap;
private function init():void{
//img.addChild(bmp);
}
private function onClick():void{
var e:ShopEvent = new ShopEvent(ShopEvent.MENU_SELECTED);
e.menuId = menuId;
e.menuName = menuText;
dispatchEvent(e);
}
]]>
</fx:Script>
<fx:Metadata>
[Event(name="menuSelected", type="com.events.ShopEvent")]
</fx:Metadata>
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<s:Label text="{menuText}" fontWeight="bold" fontSize="12" width="44"/>
<mx:Image id = "img" width="57" height="47" source="{bmp}"/>
</s:Group>
父級自定義組件。 這是上述自定義組件的父組件。 它偵聽menuSelected事件,並將其簡單地路由到偵聽器。 檢查meatadata標簽。 事件注冊已正確完成。
但是,錯誤來了
menus[i].addEventListener( ShopEvent.MENU_SELECTED,function(e:ShopEvent):void{dispatchEvent(e);});
據我所知,我在代碼中沒有看到任何問題。 里面有什么問題嗎?
更新資料
令人驚訝的是,如果我創建一個shopwevent的“新”實例將解決該問題, 但是可悲的是,我需要關閉事件對象的所有屬性 。 我希望這不是flex的限制。
menus[i].addEventListener( ShopEvent.MENU_SELECTED,function(e:ShopEvent):void{dispatchEvent(new ShopEvent(ShopEvent.MENU_SELECTED));});
完整的代碼
<?xml version="1.0" encoding="utf-8"?>
<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
width="720" height="605"
creationComplete="init()" xmlns:shop="UI.shop.*" xmlns:hasu="UI.shop.hasu.*"
>
<fx:Declarations>
<!-- Place non-visual elements (e.g., services, value objects) here -->
</fx:Declarations>
<fx:Metadata>
[Event(name="navNext", type="com.events.ShopEvent")]
[Event(name="navPrevious", type="com.events.ShopEvent")]
[Event(name="menuSelected", type="com.events.ShopEvent")]
[Event(name="submenuSelected", type="com.events.ShopEvent")]
[Event(name="itemSelected", type="com.events.ShopEvent")]
[Event(name="close", type="com.events.ShopEvent")]
</fx:Metadata>
<fx:Script>
<![CDATA[
import com.events.ShopEvent;
private const MAX_SLOTS:int = 6;
public var menus:Vector.<ShopMenuItemView>;
public var itemSlots:Vector.<ShopItemSlotView> = new Vector.<ShopItemSlotView>(MAX_SLOTS);
private function init():void{
trace("BEGIN:UI.shop.hasu.ShopView.init");
initSlots();
}
private function initSlots():void{
for (var i:int = 0;i<itemSlots.length;i++){
var slot:ShopItemSlotView = new ShopItemSlotView();
itemSlots[i] = slot;
itemSlotsContainer.addElement(slot);
}
}
public function initMenus():void{
trace("BEGIN:UI.shop.hasu.ShopView.initMenus");
for (var i:int = 0;i < menus.length;i++){
menuContainer.addElement(menus[i]);
menus[i].addEventListener(ShopEvent.MENU_SELECTED,function(e:ShopEvent):void{dispatchEvent(e);});
//menus[i].addEventListener( ShopEvent.MENU_SELECTED,function(e:ShopEvent):void{dispatchEvent(new ShopEvent(ShopEvent.MENU_SELECTED));});
}
}
]]>
</fx:Script>
<s:layout>
<s:VerticalLayout />
</s:layout>
<s:VGroup name="top">
<hasu:ShopPlayerAttributesView id="attribsComp"/>
<s:Group id="menuContainer" name="menus">
<s:layout>
<s:HorizontalLayout />
</s:layout>
</s:Group>
</s:VGroup>
<s:Group>
<s:layout>
<s:HorizontalLayout />
</s:layout>
<s:Button label="<" />
<s:Group id = "itemSlotsContainer" name="items">
<s:layout>
<s:TileLayout requestedColumnCount="3" requestedRowCount="3"/>
</s:layout>
</s:Group>
<s:Button label=">" />
</s:Group>
</s:Group>
您必須為自定義事件類覆蓋clone()方法。 事件可以在傳播過程中多次克隆。
您必須返回事件類的新構造函數,例如:
return new ShopEvent(type,...); //in the clone() method;
clone()
方法通過設置克隆中的type屬性和任何新屬性來返回事件對象的克隆副本。 通常,您定義clone()
方法以返回使用new運算符創建的事件實例。
您調度的事件來自flash.events.Event類型,而偵聽器期望的事件來自以下類型:com.events.ShopEvent。
這只是錯誤消息的含義。
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