《Flex 3 权威指南》要点整理
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1.应用程序layout属性设置为absolute，才可以使用绝对定位。
2.<mx:Addchild>标签，需要指定relativeTo和position属性，relativeTo属性表示组件会添加到哪个容器。position属性表示组件会被添加到容器中的何处。
3.<mx:Model>标签允许建立客户端数据模型。
<mx:Model id=”groceryInventory”>
<groceryInventory>
<catName>Dairy</catName>
<description>Direct from California where cows are happiest</description>
??? </groceryInventory>
</mx:Model>
可直接使用groceryInventory.description。
4.<mx:Spacer width="100%" />
5.一般来说，当一个组件已经实例化并已正确地位于应用程序中时，会分发creationComplete事件；Flex并非从上到下创建组件，而可以看成是从里向外创建。
6.事件处理函数的命名方式clickHandler()或者doClick()。
7.HTTPService组件提供了访问URL的途径，并能从这些URL中返回数据，需要执行如下步骤：（1）创建一个HTTPService对象（2）调用对象中的send()方法（3）使用返回的数据。
使用返回的数据有两种方式：第一种直接在绑定中使用数据；第二种使用result事件处理函数
第一种:<mx:HTTPService id=”prodByCatRPC" url="http://www.flexgrocer.com/categorizedProducts.xml" />
直接使用prodByCatRPC.lastResult.allUnits.unit;
8.如果想要将数据填入控件或者正以过滤、排序等手段操作数据，则ArrayCollection才是应该选择的数据结构；对于Tree控件，使用XMLListCollection
<mx:HTTPService id="prodByCatRPC" url="http://www.flexgrocer.com/categorizedProducts.xml" resultFormat="e4x" />
<mx:XMLListCollection id="foodColl" source="{prodByCatRPC.lastResult.category}" />
<mx:Tree id="productTree" height="100%" dataProvider="{foodColl}" labelField="@name" change="populateForm(event)" />
9.ComboBox控件的dataProvider属性可以被设置为某个ArrayCollection。使用数据提供者的控件的labelFiled属性指定了dataProvider中的哪一个字段会显示给终端用户。
10.向ArrayCollection添加一组数据
var catObj:Object = new Object();
??? catObj.name = "All";
??? catObj.categoryID = 0;
??? categories.addItemAt(catObj,0); // categories是ArrayCollection对象
11.当使用E4X表达式时，不需在语句中包含根结点。
12.creationComplete="unitRPC.send();prodByCatRPC.send()"
13.groceryInventory = new ArrayCollection(prodArray); // prodArray是Array对象
14.要在ArrayCollection中使用光标定位，必须先排序集合。
?? cursor = aItems.createCursor(); // aItems是ArrayCollection对象
?? sortItems(); // 排序集合
?? var found:Boolean = cursor.findFirst(item);
?? if (found)
?? {
??? var sci:ShoppingCartItem = cursor.current as ShoppingCartItem;
?? }
?? else return null;
?? return sci;
15.添加命名空间xmlns:="views.dataEntry.*"。
16.标签必须要有一个根结点，根结点的名称并不重要。
17.有时候需要创建UIComponent的轻量级组件，如数据管理器，HTTPService。
18.调用父级的函数this.parentDocument.categorizedProductDataLoaded(aCats);
19.itemRenderer的使用：
?<mx:HorizontalList http://www.adobe.com/2006/mxml"
?dataProvider="{cats}" itemRenderer="views.ecomm.TextAndPic"
?horizontalScrollPolicy="off">
20.Repeater可遍历数据集，使你能访问其中的每一项。currentItem属性引用了所有数据中当前处理的部分；getRepeaterItem()方法可以返回dataProvider属性中的一项数据。
<mx:Repeater id=”myRepeater" dataProvider="{dp}">
??? <mx:RadioButton label={myRepeater.currentItem.name}"
??????? click="priceLable.text = event.target.getRepeaterItem().cost" />
myButtons[0].label = "New Banana";
21.为了访问应用程序的顶级属性和方法，可以使用mx.core.Application类中的application属性。该属性提供了对Application对象的引用，在Flex应用程序的任何地方都可以使用。但不推荐。mx.core.Application.application.addToCart(prod);
22.可以利用事件流的冒泡在上层组件截获消息，这样就不需要层层传递。
23.createChildren()和updateDisplayList()方法的使用：
? protected override function createChildren():void
? {
?? super.createChildren();
?? btStateUp = new Button();
?? btStateDown = new Button();
?? rawChildren.addChild(btStateUp);
?? rawChildren.addChild(btStateDown);
? }
? protected override function updateDisplayList(unscaledWidth:Number,unscaledHeight:Number):void
? {
?? super.updateDisplayList(unscaledWidth,unscaledHeight);
??
?? if (unscaledWidth > 0) this.visible = true;
?? else this.visible = false;
??
?? btStateUp.setActualSize(btStateUp.getExplicitOrMeasuredWidth(),btStateUp.getExplicitOrMeasuredHeight());
?? btStateDown.setActualSize(btStateDown.getExplicitOrMeasuredWidth(),btStateDown.getExplicitOrMeasuredHeight());
??
?? var pixelsFromTop:int = 5;
?? var pixelsFromRight:int = 10;
?? var buttonWidth:int = btStateUp.width;
??
?? var x:Number = unscaledWidth – buttonWidth – pixelsFromRight;
?? var y:Number = pixelsFromTop;
??
?? btStateDown.move(x,y);
?? btStateUp.move(x,y);
? }
24.startData.selectedDate = new Date(2006,3,1); Flex中的月份是从0开始的，所以0代表1月，11代表12月。
25.DataGrid组件
?? <mx:DataGrid editable="true" draggableColumns="false" variableRowHeight="true"> // variableRowHeight设为true可使用Flex为适应缩略图而自动调整行高
?? <mx:DataGridColumn dataField="product" headerText="Product"
??? itemRenderer="renderer.ecomm.ProductName" editable="false" />
?? <mx:DataGridColumn dataField="quantity" headerText="Quantity"
??? itemEditor="mx.controls.NumericStepper" editorDataField="value"
??? editable="true" /> // 该列的底层数据绑定到了NumericStepper控件value属性上
?? <mx:DataGridColumn dataField="subtotal" headerText="Amount"
??? labelFunction="renderPriceLabel" editable="false" />
?? <mx:DataGridColumn editable="false">
??? <mx:itemRenderer>
???? <mx:Component>
????? <mx:VBox>
?????? <mx:Button label="Remove" click="outerDocument.removeItem(data as ShoppingCartItem)" />
……..
?? private function renderPriceLabel(item:ShoppingCartItem,dataField:DataGridColumn):String
?? {
??? return "$" String(item.subtotal);
?? }
26.AdvancedDataGrid组件
（1）专家模式：sortExpertMode = true的时候按住Ctrl排列
（2）样式设置：
public function myStyleFunc(data:Object,col:AdvancedDataGridColumn):Object
?? {
??? if (data["cost"] == .99)
??? {
???? return {color:0xff0000,fontWeight:"bold"};
??? }
??? else return null;
?? }
?? <mx:AdvancedDataGrid dataProvider="{dp}" styleFunction="myStyleFunc"
? height="250">
（3）对数据进行分组：
??? <mx:AdvancedDataGrid? height="200" creationComplete=”myGroup.refresh()”>
???? <mx:dataProvider>
????? <mx:GroupingCollection id="myGroup" source="{dp}">
?????? <mx:Grouping>
??????? <mx:GroupingField name="cat" />
?????? </mx:Grouping>
????? </mx:GroupingCollection>
???? <mx:dataProvider>
? </mx:AdvancedDataGrid>
（4）显示摘要数据：
<mx:AdvancedDataGrid creationComplete="myGroup.refresh()" height="200" defaultLeafIcon="{null}">
??? <mx:dataProvider>
??? ??? <mx:GroupingCollection id="myGroup" source="{dp}">
??? ??? ??? <mx:Grouping>
??? ??? ??? ??? <mx:GroupingField name="cat">
??? ??? ??? ??? ??? <mx:summaries>
??? ??? ??? ??? ??? ??? <mx:SummaryRow summaryPlacement="last">
??? ??? ??? ??? ??? ??? ??? <mx:fields>
??? ??? ??? ??? ??? ??? ??? ??? <mx:SummaryField dataField="qty" operation="SUM" label="summary" /> // SUM/MIN/MAX/AVG
??? ??? ??? ??? ??? ??? ??? </mx:fields>
??? ??? ??? ??? ??? ??? </mx:SummaryRow>
??? ??? ??? ??? ??? </mx:summaries>
??? ??? ??? ??? </mx:GroupingField>
??? ??? ??? </mx:Grouping>
??? ??? </mx:GroupingCollection>
??? </mx:dataProvider>
??? <mx:columns>
??? ??? <mx:AdvancedDataGridColumn dataField="name" />
??? ??? <mx:AdvancedDataGridColumn dataField="cost" />
??? ??? <mx:AdvancedDataGridColumn dataField="qty" />
??? ??? <mx:AdvancedDataGridColumn dataField="summary" />
??? </mx:columns>
??? <mx:rendererProviders>
??? ??? <mx:AdvancedDataGridRendererProvider dataField="summary" columnIndex="1" columnSpan="2" renderer="renderers.SummaryText" />
??? </mx:rendererProviders>
</mx:AdvancedDataGrid>
?
27.DragSource和DragManager组件
Flex有两类拖放功能组件：增强型拖放功能组件（DataGrid，PrintDataGrid，Tree，Menu，List，HorizontailList，TileList）和非增强型拖放组件。
（1）在两个DataGrid之间拖放
向拖拽初始器添加dragEnabled属性；初始化释放目标的dataProvider；向释放目标添加dropEnabled属性。
（2）在DataGrid和List之间拖放
给释放目标List添加dragDrop方法
?? private function doDragDrop(event:DragEvent):void
?? {
??? var dgRow:Object = new Object();
??? dgRow = event.dragSource.dataForFormat("items"); //与DataGrid中的数据相关联的格式总是items
??? targetList.dataProvider.addItem(dgRow[0].name);
??? event.preventDefault(); // 取消默认行为
?? }
如果想让用户拖动多行数据，就要把DataGrid的multipleSelection属性设为true。
（3）用不可以直接拖拽组件上实现拖放操作
?? <mx:Label text="Drag me" mouseDown="dragIt(myLabel,‘My data here’,event,‘myFormat’)"/> // 或者mouseMove
?? dragEnter="doDragEnter(event,‘myFormat’)"
? dragDrop="doDragDrop(event,‘myFormat’)"/>
?? private function dragIt(initiator:Label,dsData:String,event:MouseEvent,format:String):void
?? {
??? var ds:DragSource = new DragSource();
??? ds.addData(dsData,format);
??? DragManager.doDrag(initiator,ds,event);
?? }??
?? private function doDragEnter(event:DragEvent,format:String):void
?? {
??? if (event.dragSource.hasFormat(format))
??? {
???? DragManager.acceptDragDrop(IUIComponent(event.target));
??? }
?? }
?? private function doDragDrop(event:DragEvent,format:String):void
?? {
??? var myLabelData:Object = new Object();
??? myLabelData = event.dragSource.dataForFormat(format);
??? myList.dataProvider.addItem(myLabelData);
?? }
（4）修改拖拽过程中显示的图片
?? private function dragIt(initiator:Canvas,dsData:Product,format:String):void
?? {
??? var imageProxy:Image = new Image();
??? imageProxy.load("assets/" groceryItem.imageName);
??? imageProxy.height = 80;
??? imageProxy.width = 80;
???
??? var ds:DragSource = new DragSource();
??? ds.addData(dsData,imageProxy);
?? }
28.如果某个类没有编写构造函数，ActionScript会自动创建一个。
29.通过Model和自定义Event传递参数。
?? private function process():void{
??? var o:ObjectDataEvent=new ObjectDataEvent("ccInfoReturn",checkoutInfo);
??? dispatchEvent(o);
?? }
<mx:Model id=”checkoutInfo">
? <custInfo>
?? <billingName>{cardType.selectedItem.data}</billingName>
?? <billingAddress>{cardNumber.text}</billingAddress>
?? <billingCity>{cardExpirationMonth.selectedItem}</billingCity>
?? <billingDate>{cardExpirationYear.selectedItem}</billingDate>
? </custInfo>
?</mx:Model>
30.使用格式器CurrencyFormatter可以四舍五入小数，设置小数的精度，指定货币符号。
<mx:CurrencyFormatter id="curFormat" currencySymbol="$" precision="2" />
<mx:Label id=”price” text=”curFormat.format(groceryItem.listPrice)}" x="100" y="20" />
31.使用格式器DataFormatter用来格式化日期，默认格式是M/DD/YYYY。
?
32.使用验证器ZipCodeValidaor。
<mx:ZipCodeValidator id="zipV" source="{billingZip}" property="text" domain="US or Canada" />
33.使用验证器CreditCardValidator。
<mx:CreditCardValidator id="ccV" cardTypeSource="{cardType.selectedItem}" cardTypeProperty="data"
? cardNumberSource="{cardNumber}" cardNumberProperty="text"/>
?? private var vResult:ValidationResultEvent;
?? private function process():void{
??? vResult = ccV.validate();
??? if (vResult.type == ValidationResultEvent.VALID) // 验证成功
??? {
???? var o:ObjectDataEvent=new ObjectDataEvent("ccInfoReturn",checkoutInfo);
???? dispatchEvent(o);
??? }
??? else
??? {????
??? }
?? }
34.使用正则表达式来验证数据。
. 表示通配符；//. 转义字符；//d 表示一个数字；//d 表示一个或多个数字；//x20 表示一个空格；[A-Za-z] 表示任意长度字母的组合
var pattern:RegExp = new RegExp(".//.[Gg][Ii][Ff]");
var pattern:RegExp = new RegExp("//d //x20[A-Za-z] ");
prodModel.imageName.search(pattern) != -1
35.构建自定义验证器类（内有正则表达式）。
? public class AddressValidator extends Validator
?{
? private var results:Array;
? public function AddressValidator()
? {
?? super();
? }?
? override protected function doValidation(value:Object):Array
? {
?? results = [];
?? results = super.doValidation(value);
?? if (value != null)
?? {
??? var pattern:RegExp = new RegExp("//d //x20[A-Za-z] ");
??? if (value.search(pattern) == -1)
??? {
???? results.push(new ValidationResult(true,null,"notAddress","This is not a valid US address"));
??? }
?? }
?? return results;
? }
?}
<mx:AddressValidator id="addressV" required="true" source="{billingAddress}" property="text" />
36.实现历史管理
According和TabNavigator默认启用了历史管理；ViewStack默认是禁用的，设置属性historyManagementEnabled为true即可开启。
没有默认实现历史管理的组件来实现历史管理需要以下六个步骤：
（1）该组件需要实现IHistoryManagerClient接口。
（2）用HistoryManager类注册该组件。
（3）在该组件中实现loadState()方法。 // 用户单击浏览器中的前进或后退按钮时，将激活这个方法。
（4）在该组件中实现saveState()方法。
<mx:HorizontalList http://www.adobe.com/2006/mxml"
?implements="mx.managers.IHistoryManagerClient"
?creationComplete="registerWithHistoryManager()">
?? private function registerWithHistoryManager():void
?? {
??? HistoryManager.register(this);
??? HistoryManager.save(); // 在第一次注册组件时，必须调用save方法，并且切换状态的时候也要调用save方法。
?? }
?? public function saveState():Object
?? {
??? var state:Object = new Object();
??? state.selectedIndex = this.selectedIndex;
??? return state;
?? }?
?? public function loadState(state:Object):void
?? {
??? var newIndex:int;
??? if (state)
??? {
???? newIndex = int(state.selectedIndex);
??? }
??? else newIndex = -1;??
??? if (newIndex != selectedIndex) // selectedIndex是内置变量
??? {
???? selectedIndex = newIndex;
???? broadcastCategoryEvent();
??? }
?? }
37.实现深度链接
<mx:HorizontalList xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="initApp()">
private var browserMgr:IBrowserManager = BrowserManager.getInstance();
private function initApp():void
?? {
??? browserMgr.init(”,"Flex Grocer"); // 浏览器的标题Flex Grocer
??? browserMgr.addEventListener(BrowserChangeEvent.BROWSER_URL_CHANGE,parseURL);
?? }
?? private function updateURL():void // 每点击一次调用这个函数
?? {
??? var o:Object = new Object();
??? o.category = selectedIndex;
??? var s:String = URLUtil.objectToString(o);
??? browserMgr.setFragment(s);
??? setTitle();
?? }
?? private function parseURL(event:BrowserChangeEvent = null):void
?? {
??? var o:Object = URLUtil.stringToObject(browserMgr.fragment); // 将URL片段解析为一个对象
??? if (!cats)
??? {
???? callLater(parseURL);
???? return;
??? }
??? if (o.category != null)
??? {
???? selectedIndex = o.category;
???? setTitle();
???? broadcastCategoryEvent();
??? }
?? }
?? private function setTitle():void
?? {
??? var title:String = "Flex Grocer – " (selectedItem as Category).catName;
??? browserMgr.setTitle(title);
?? }
38.cardTyle.setStyle(“selectionColor”,0Xea800c); // setStyle时，颜色值只能以0x为前缀。
39.SetStyle只在父视图状态期间有效的样式。
<mx:states>
??? ??? <mx:State name="expanded">
??? ??? ??? <mx:SetStyle name="styleName" value="borderBox" />
??? ??? ??? <mx:SetProperty target="{add}" name="visible" value="true" />
??? ??? </mx:State>
??? </mx:states>
40.从CSS文件创建SWF：右击CSS文件，选择Compile To SWF选项。
41.用StyleManager加载CSS的SWF
StyleManager.loadStyleDeclarations("flexGrocer.swf"); // 加载
StyleManager.unloadStyleDeclarations("flexGrocer.swf"); // 卸载
42.加载图形皮肤
（1）在MXML标签中设置皮肤
<mx:Button upSkin="@Embed(‘../assets/myFancyUpSkin.gif’)" />
（2）在CSS块中设置皮肤
<mx:Style>
??? ??? Button
??? ??? {
??? ??? ??? overSkin: Embed("../assets/images/myFancyOverSkin.gif");
??? ??? }
??? </mx:Style>
（3）在ActionScript中设置皮肤
<mx:Script>
??? ??? <![CDATA[
??? ??? ??? [Embed("assets/myFancyDownSkin.gif")]
??? ??? ??? var ds:Class;
??? ??? ??? function initApp()
??? ??? ??? {
??? ??? ??? ??? myButton.setStyle("downSkin",ds);
??? ??? ??? }
??? ??? ]]>
??? </mx:Script>
43.可编程的皮肤
public class OrangeOval extends ProgrammaticSkin // skins.OrangeOval
??? {
??? ??? protected override function updateDisplayList(w:Number,h:Number):void
??? ??? {
??? ??? ??? var lineThickness:int = 4;
??? ??? ??? var backgroundFillColor:Number;
??? ??? ???
??? ??? ??? switch (name)
??? ??? ??? {
??? ??? ??? ??? case "upSkin":
??? ??? ??? ??? ??? backgroundFillColor = 0xEA800C;
??? ??? ??? ??? ??? break;
??? ??? ??? ??? case "overSkin":
??? ??? ??? ??? ??? backgroundFillColor = 0xF8B872;
??? ??? ??? ??? ??? break;
??? ??? ??? ??? case "downSkin":
??? ??? ??? ??? ??? backgroundFillColor = 0xB06109;
??? ??? ??? ??? ??? break;
??? ??? ??? ??? case "disabledSkin":
??? ??? ??? ??? ??? backgroundFillColor = 0xCCCCCC;
??? ??? ??? ??? ??? break;
??? ??? ??? }
??? ??? ??? graphics.clear();
??? ??? ??? graphics.beginFill(backgroundFillColor);
??? ??? ??? graphics.drawEllipse(0,w,h);
??? ??? ??? graphics.endFill();
??? ??? }
??? }
.homePageButton
{
??? upSkin:ClassReference(‘skins.OrangeOval’);
??? downSkin:ClassReference(‘skins.OrangeOval’);
??? overSkin:ClassReference(‘skins.OrangeOval’);
??? disabledSkin:ClassReference(‘skins.OrangeOval’);
??? color: #ffffff;
}
44.使用web服务
<mx:WebService
??? ??? id="dashboardWS"
??? wsdl="http://localhost:8300/flexGrocer/cfcs/aggregate.cfc?wsdl"
??? ??? fault="showFault(event)">
??? ??? <mx:operation name="getTypeSalesData" result="typeRPCResult(event)"> // getTypeSalesData函数接收2个参数，startDate和endDate
??? ??? ??? <mx:request>
??? ??? ??? ??? <startDate>{startDate.selectedDate}</startDate>
??? ??? ??? ??? <endDate>{endDate.selectedDate}</endDate>
??? ??? ??? </mx:request>
??? ??? </mx:operation>
??? ??? <mx:operation name="getSalesData" result="salesRPCResult(event)">
??? ??? ??? <mx:request>
??? ??? ??? ??? <startDate>{startDate.selectedDate}</startDate>
??? ??? ??? ??? <endDate>{endDate.selectedDate}</endDate>
??? ??? ??? ??? <category>{selectedType}</category>
??? ??? ??? </mx:request>
??? ??? </mx:operation>
??? </mx:WebService>
45.上传文件
private function fileBrowse():void
{
??? this.fileRef = new FileReference();
??? fileRef.addEventListener(Event.SELECT,selectHandler); // 该事件在用户在对话框中选中文件且单击OK按钮之后触发
??? fileRef.addEventListener(Event.COMPLETE,completeHandler);
???
??? var gifFilter:FileFilter = new FileFilter("GIF Images","*.gif","GIFF");
??? fileRef.browse([gifFilter]);
}
private function selectHandler(event:Event):void
{
??? var request:URLRequest = new URLRequest("C:/Users/chenchao/Documents/Flex Builder 3/FlexGrocer");
??? fileRef.upload(request);
}
private function completeHandler(event:Event):void
{
??? dispatchEvent(new Event("uploadComplete"));
}
46.把ActionScript对象映射到服务器对象
[RemoteClass(alias="FlexGrocer.cfcs.OrderInfo")]
public class OrderInfo
private function onResultEvent(event:ResultEvent):void
{
??? remoteVO = event.result as OrderInfo; // where our OrderInfo class will be populated
}
将ActionScript类绑定到Java类。
待传输类的服务器和客户端样本必须包含相同数量的属性；每个类的相同属性必须拥有相同的名字。
47.可视化数据：饼状图、柱形图和折线图
<mx:LineChart id="chart" dataProvider="{dp}" height="100%" width="100%" showDataTips="true" dataTipFunction="renderTips">
??? <mx:horizontalAxis> //水平轴
??? ??? <mx:CategoryAxis categoryField="date" id="catAxis" />
??? </mx:horizontalAxis>
??? <mx:series>
??? ??? <mx:LineSeries yField="{grossOrNet}">
??? ??? </mx:LineSeries>
??? </mx:series>
</mx:LineChart>
<mx:Legend direction="horizontal" dataProvider="{chart}" /> //向图标添加图例
<mx:ColumnChart id="chart" dataProvider="{dp}" width="100%" height="100%">
??? <mx:horizontalAxisRenderers> // 限制轴上显示的标识数量
??? ??? <mx:AxisRenderer canDropLabels="true" axis="{hCatAxis}" />
??? </mx:horizontalAxisRenderers>
??? <mx:horizontalAxis>
??? ??? <mx:CategoryAxis id="hCatAxis" categoryField="date"/>
??? </mx:horizontalAxis>
??? <mx:verticalAxis>
??? ??? <mx:LinearAxis id="vLinAxis" labelFunction="renderDollars"/>
??? </mx:verticalAxis>
??? <mx:series>
??? ??? <mx:ColumnSeries yField="gross" displayName="Gross">
??? ??? </mx:ColumnSeries>
??? ??? <mx:ColumnSeries yField="net" displayName="Net">
??? ??? </mx:ColumnSeries>
??? </mx:series>
</mx:ColumnChart>
<mx:SeriesInterpolate id="interpolate" elementOffset="5" /> // SeriesInterpolate 效果与 showDataEffect 效果触发器一同使用
<mx:PieChart id="chart" width="100%" height="100%" dataProvider="{dp}"
??? showDataTips="true" dataTipFunction="renderTips"
??? itemClick="broadcastTypeChange(event.hitData.item)">
??? <mx:series>
??? ??? <mx:PieSeries field="{grossOrNet}"
??? ??? ??? labelPosition="insideWithCallout" labelFunction="renderLabel" showDataEffect="interpolate">
??? ??? ??? <mx:fills> // 用样式自定义图标外观
??? ??? ??? ??? <mx:RadialGradient>
??? ??? ??? ??? ??? <mx:entries>
??? ??? ??? ??? ??? ??? <mx:GradientEntry color="#EF7651" ratio="0" />
??? ??? ??? ??? ??? ??? <mx:GradientEntry color="#994C34" ratio="1" />
??? ??? ??? ??? ??? </mx:entries>
??? ??? ??? ??? </mx:RadialGradient>
??? ??? ??? ??? <mx:RadialGradient>
??? ??? ??? ??? ??? <mx:entries>
??? ??? ??? ??? ??? ??? <mx:GradientEntry color="#E9C836" ratio="0" />
??? ??? ??? ??? ??? ??? <mx:GradientEntry color="#AA9127" ratio="1" />
??? ??? ??? ??? ??? </mx:entries>
??? ??? ??? ??? </mx:RadialGradient>
??? ??? ??? ??? <mx:RadialGradient>
??? ??? ??? ??? ??? <mx:entries>
??? ??? ??? ??? ??? ??? <mx:GradientEntry color="#6FB35F" ratio="0" />
??? ??? ??? ??? ??? ??? <mx:GradientEntry color="#497B54" ratio="1" />
??? ??? ??? ??? ??? </mx:entries>
??? ??? ??? ??? </mx:RadialGradient>
??? ??? ??? ??? <mx:RadialGradient>
??? ??? ??? ??? ??? <mx:entries>
??? ??? ??? ??? ??? ??? <mx:GradientEntry color="#A1AECF" ratio="0" />
??? ??? ??? ??? ??? ??? <mx:GradientEntry color="#47447A" ratio="1" />
??? ??? ??? ??? ??? </mx:entries>
??? ??? ??? ??? </mx:RadialGradient>
??? ??? ??? ??? <mx:RadialGradient>
??? ??? ??? ??? ??? <mx:entries>
??? ??? ??? ??? ??? ??? <mx:GradientEntry color="#996666" ratio="0" />
??? ??? ??? ??? ??? ??? <mx:GradientEntry color="#999966" ratio="1" />
??? ??? ??? ??? ??? </mx:entries>
??? ??? ??? ??? </mx:RadialGradient>
??? ??? ??? ??? <mx:RadialGradient>
??? ??? ??? ??? ??? <mx:entries>
??? ??? ??? ??? ??? ??? <mx:GradientEntry color="#339933" ratio="0" />
??? ??? ??? ??? ??? ??? <mx:GradientEntry color="#339999" ratio="1" />
??? ??? ??? ??? ??? </mx:entries>
??? ??? ??? ??? </mx:RadialGradient>
??? ??? ??? </mx:fills>
??? ??? </mx:PieSeries>
??? </mx:series>
</mx:PieChart>
48.本地化 Flex Application
var myResources:ResourceBundle;
?? myResources = new ResourceBundle("en_US","myResources");
?? myResources.content["OPEN"] = "Open";
?? myResources.content["CLOSE"] = "Close";
?? resourceManager.addResourceBundle(myResources);
?? myResources = new ResourceBundle("fr_FR","myResources");
?? myResources.content["OPEN"] = "Ouvrez";
?? myResources.content["CLOSE"] = "Fermez";
?? resourceManager.addResourceBundle(myResources);
?? resourceManager.update();
?<mx:Label text="{resourceManager.getString(‘myResources’,‘OPEN’)}" />
?<mx:Label text="{resourceManager.getString(‘myResources’,‘CLOSE’)}" />
?<mx:Button label="English" click="changeLocale(‘en_US’)"/>
?<mx:Button label="French" click="changeLocale(‘fr_FR’)"/>
?? private function changeLocale(locale:String):void
?? {
??? resourceManager.localeChain = [locale];
?? }
49.使用 Modules
(1).Loading a module with ModuleLoader
Project——Properties——Flex Modules——Add
?? private function loadChartModule():void
?? {
??? loader.url = "modules/ChartModule.swf";
??? loader.loadModule();
?? }
?? private function loadFormModule():void
?? {
??? loader.url = "modules/FormModule.swf";
??? loader.loadModule();
?? }
?? <mx:ModuleLoader id="loader" width="100%" height="100%" />
(2).Passing data to module
?? private function readyHandler(event:Event):void
?? {
??? if (loader.child is FormModule)
??? {
???? loader.child.addEventListener("submit",submitHandler);
??? }
?? }
?? private function submitHandler(event:ChartDataEvent):void
?? {
??? chartData = event.data;
??? loadChartModule();
?? }
?? <mx:ModuleLoader id="loader" width="100%" height="100%" ready="readyHandler(event)"/>
50.Managing Data on the Client
(1).Filtering data with the ArrayCollection class 过滤
?? [Bindable]
?? private var contacts:ArrayCollection;
?? private function filterByCity(item:Object):Boolean
?? {
??? if (item.city == filterInput.text) return true;
??? else return false;???
?? }
?? private function doFilter():void
?? {
??? if (filterInput.text.length == 0)
??? {
???? contacts.filterFunction = null;
??? }
??? else
??? {
???? contacts.filterFunction = filterByCity;
??? }
??? contacts.refresh();
?? }
<mx:Button label="Filter" click="doFilter()"/>
(2).Sorting data with the ArrayCollection class 排序
?? [Bindable]
?? private var contacts:ArrayCollection;
?? private function doSort():void
?? {
??? var mySort:Sort = new Sort();
??? if (sortGroup.selectedValue.toString() == "city")
??? {
???? var field:SortField = new SortField("city",true);
???? mySort.fields = [field];
??? }
??? else
??? {
???? var field1:SortField = new SortField("lastname",true);
???? var field2:SortField = new SortField("firstname",true);
???? mySort.fields = [field1,field2];
??? }
??? contacts.sort = mySort;
??? contacts.refresh();
?? }
?? <mx:RadioButtonGroup id="sortGroup" itemClick="doSort()"/>
(3).Finding data with the IViewCursor interface 查询
?? private function doFind():void
?? {
??? var cursor:IViewCursor = contacts.createCursor();
??? var searchObj:Object = new Object();
??? searchObj.lastname = lnameInput.text;
??? searchObj.firstname = fnameInput.text;
??? if (cursor.findAny(searchObj))
??? {
???? myGrid.selectedItem = cursor.current;
???? myGrid.scrollToIndex(myGrid.selectedIndex); // 跳转到所查询到的那一行
??? }
?? }
51.TextEvent事件很好用，可以带一个字符串参数
52.调整Flash CS3中的帧率为24，因为Flex中是24帧每秒。
53.E4X expressions for parsing data
XML being searched:
<?xml version="1.0"?>
<invoices>
? <invoice>
??? <customer>
????? <firstname>Maria</firstname>
????? <lastname>Smith</lastname>
??? </customer>
??? <items>
????? <lineitem price="21.41" quantity="4">Widget</lineitem>
????? <lineitem price="2.11" quantity="14">Mouse</lineitem>
????? <lineitem price="8.88" quantity="3">Wrench</lineitem>
??? </items>
? </invoice>
? <invoice>
??? <customer>
????? <firstname>John</firstname>
????? <lastname>Jones</lastname>
??? </customer>
??? <items>
????? <lineitem price="7.41" quantity="84">Mouse</lineitem>
????? <lineitem price="0.91" quantity="184">Mousepad</lineitem>
??? </items>
? </invoice>
</invoices>
Select an E4X expression:
xInvoices.invoice
xInvoices.invoice[1]
xInvoices.invoice[0].customer
xInvoices..customer
xInvoices..customer.(lastname==’Jones’)
xInvoices..lineitem.(toString()==’Mouse’)
xInvoices..lineitem.(@price <
54.E4X expressions for modifying data 修改 xml 数据
xInvoices.invoice[0].customer.city=’Seattle’ // 增加city结点
xInvoices.invoice[0].items.lineitem[0].@inStock=true // 增加inStock属性
delete xInvoices.invoice[1] // 删除一个结点
delete xInvoices.invoice[0].items.lineitem // 删除一个结点
delete xInvoices.invoice[0].items.lineitem[0].@quantity // 删除一个结点中的属性
55.<mx:SWFLoader source="@Embed(‘assets/Sub2.swf’)"/>
<mx:SWFLoader source="assets/Sub2.swf"/>
56.设置组件的标签索引<mx:TextInput tabIndex="3"/>
57.Text组件
<mx:Text condenseWhite="true">
??? <mx:htmlText>
??? ??? <![CDATA[
??? ??? ??? <font color="#ff0000"><b>the quick</b></font>
??? ??? ]]>
??? </mx:htmlText>
</mx:Text>
58.TextInput的restrict<mx:TextInput restrict="A-Z a-z" />
