Flex Viewer 开发教程（6）Widget与共享数据

public?class?DataManager?extends?EventDispatcher{

?

???????private?var?dataTable:Hashtable;?①

?

???????public?function?DataManager(){

super();

dataTable=new?Hashtable();

ViewerContainer.addEventListener(AppEvent.CONFIG_LOADED,config);②

?????? ????//this is a example to setup the listner to get the type of data

?the Data

?????? ????//Manager is interested in.

????????????? ViewerContainer.addEventListener (AppEvent.DATA_FETCH_ALL,

fetchAllData);③

????????????? ViewerContainer.addEventListener (AppEvent.DATA_PUBLISH,

addData);④

?????? ??? ViewerContainer.addEventListener(AppEvent.DATA_FETCH,

fetchData);⑤

?????? }

?

private?function?config(event:AppEvent):void{

}

?

???????private?function?fetchAllData(event:AppEvent):void{⑥

????????????? ViewerContainer.dispatchEvent(new?AppEvent (AppEvent.DATA_SENT,

?dataTable));

?????? }

?

???????private?function?fetchData(event:AppEvent):void{⑦

??????????????var?key:String=event.data.key?as?String;

??????????????var?data:Object={key: key,collection: dataTable.find(key)};

????????????? ViewerContainer.dispatchEvent(new

AppEvent (AppEvent.DATA_SENT,data));

?????? }

?

???????private?function?addData(event:AppEvent):void{⑧

??????????????var?key:String=event.data.key;

??????????????if?(key){

?????????????????????var?dataCollection:Object=event.data.collection;

?????????????????????if?(dataTable.containsKey(key)){

?????????????????????? ????? dataTable.remove(key);

???????????????????? }

???????????????????? dataTable.add(key,dataCollection);

?????????????????????//var data:Object={key: key,data: dataTable};

?????????????????????? ??????// change by ropp to just send new published data

?????????????????????? ??????var?data:Object={key: key,data:?dataCollection};

???????????????????? ViewerContainer.dispatchEvent(new

AppEvent (AppEvent.DATA_NEW_PUBLISHED,data));

????????????? }

?????? }

}

/**

?* Add information from a widget to the DataManager so that it can be shared

?between widgets.

?* @param key the widget name

?* @param arrayCollection the list of object in infoData structure.

?*/

public?function?addSharedData(key:String,

arrayCollection:ArrayCollection):void{①

?? ?var?data:Object =?{

??????????????? key: key,

??????????????? collection: arrayCollection

??? };

ViewerContainer.dispatchEvent(new?AppEvent (AppEvent.DATA_PUBLISH,

?data));

}

?* Fetch shared data from DataManager.

public?function?fetchSharedData():void{②

ViewerContainer.dispatchEvent(new

AppEvent (AppEvent.DATA_FETCH_ALL));

}

* Fetch share data from DataManager by key

* @param key

*/

public?function?fetchShareDataByKey(key:String):void{③新添加方法

ViewerContainer.dispatchEvent(new

AppEvent (AppEvent.DATA_FETCH,{key:key}));

}

<?xml version="1.0" encoding="utf-8"?>

<viewer:BaseWidget?xmlns:fx="http://ns.adobe.com/mxml/2009"

?????????????????????? ????? ?? xmlns:s="library://ns.adobe.com/flex/spark"

?????????????????????? ????? ?? xmlns:mx="library://ns.adobe.com/flex/mx"

?????????????????????? ????? ?? xmlns:viewer="com.esri.viewer.*"

?????????????????????? ????? ?? creationComplete="init()">

???????<fx:Script>

????????????? <![CDATA[

?????????????????????import?com.esri.viewer.AppEvent;

?????????????????????import?com.esri.viewer.ViewerContainer;

?????????????????????import?com.esri.viewer.utils.Hashtable;

?????????????????????import?mx.collections.ArrayCollection;

?

?????????????????????private?function?init():void{①

?????????????????????? ????? ViewerContainer.addEventListener(AppEvent.DATA_SENT,

?dataSentHandler);

ViewerContainer.addEventListener(AppEvent.DATA_NEW_PUBL

ISHED,dataNewPublishedHandler);

???????????????????? }

?

?????????????????????function?dataSentHandler(event:AppEvent):void{②

?????????????????????? ??????if?(event.data?is?Hashtable){

?????????????????????? ?????????????var?keyValue:String="";

?????????????????????? ?????????????var?table:Hashtable=Hashtable(event.data);

?????????????????????? ?????????????var?keySet:Array=table.getKeySet();

?????????????????????? ?????????????for each?(var?key:String?in?keySet){

?????????????????????? ??????????????????? keyValue +="key: "?+ key +?"; value: "?+

String (table.find(key)) +?" ";

?????????????????????? ???????????? }

?????????????????????? ???????????? allValue.text=keyValue;

?????????????????????? ????? }

?????????????????????? ??????else?if?(event.data.collection)

?????????????????????? ???????????? fValue.text=event.data.collection[0];

???????????????????? }

?

????????????? ????function

dataNewPublishedHandler(event:AppEvent):void{③

?????????????????????? ??????var?data:Object=event.data;

?????????????????????? ??????var?key:String=data.key;

?????????????????????? ??????var?value:String=data.data[0];

?????????????????????? ??????this.nKey.text=key;

?????????????????????? ??????this.nValue.text=value;

?????? ??? ?????}

?

?????????????????????function?shareData():void{④

?????????????????????? ??????this.addSharedData(key.text,?new

ArrayCollection([value.text]));

???????????????????? }

?

?????????????????????function?fetchByKey():void{⑤

?????????????????????? ??????this.fetchShareDataByKey(fKey.text);

???????????????????? }

?

?????????????????????function?fetchAll():void{⑥

?????????????????????? ??????this.fetchSharedData();

???????????????????? }

????????????? ]]>

???????</fx:Script>

???????<viewer:WidgetTemplate?width="500"?height="300">

??????????????<s:VGroup?width="100%"?height="100%">

?????????????????????<s:HGroup?width="100%"?verticalAlign="middle">

?????????????????????? ??????<s:Label?text="Key"/>

?????????????????????? ??????<s:TextInput?id="key"/>

?????????????????????? ??????<s:Label?text="Value"/>

?????????????????????? ??????<s:TextInput?id="value"/>

?????????????????????? ??????<s:Button?label="Share"?click="shareData()"/>

?????????????????????</s:HGroup>

?????????????????????<s:HGroup?width="New Share Data"/>

?????????????????????? ??????<s:Label?text="nKey"/>

?????????????????????? ??????<s:Label?text="nValue"/>

?????????????????????</s:HGroup>

?????????????????????<s:HGroup?width="fKey"/>

?????????????????????? ??????<s:Button?label="Fetch by Key"?click="fetchByKey()"/>

?????????????????????? ??????<s:Label?text="fValue"/>

?????????????????????</s:HGroup>

?????????????????????<s:VGroup?width="100%"

?????????????????????? ???????????? ? verticalAlign="middle"?horizontalAlign="center">

?????????????????????? ??????<s:Button?label="Fetch All"?click="fetchAll()"/>

?????????????????????? ??????<s:TextArea?id="allValue"?width="100%" height="100%"/>

?????????????????????</s:VGroup>

??????????????</s:VGroup>

???????</viewer:WidgetTemplate>

</viewer:BaseWidget>