Flex：使用@Embed嵌入元素

可以在Flex应用程序中嵌入各种元素。被嵌入的元素将编译进SWF文件。它们不是在运行时载入的，所以不必为应用程序部署原元素。

 

1. 可以嵌入的图像格式有PNG、JPEG、GIF。嵌入后可以同时使用它的多个实例

下面的例子使用[Embed]原标签经image嵌入应用程序，并且采用绑定ActionScript类的形式。这就可以绑定Image控件的source属性到Logo类。可以绑定Logo类到任何可以使用image的组件属性上，比如Button控件的icon属性。

<?xml version="1.0" encoding="utf-8"?><!-- http://yecon.blog.hexun.com/29628260_d.html -->
<mx:Application 
    xmlns:mx="http://www.adobe.com/2006/mxml" 
    viewSourceURL="src/EmbeddingImages/index.html"
    layout="horizontal" width="350" height="250">
    
    <mx:Script>
        <![CDATA[
            [Embed(source="assets/logo.png")]
            [Bindable]
            public var Logo:Class;            
        ]]>
    </mx:Script>

    <mx:Image id="myLogo" source="{Logo}"/>

    <mx:Image id="myLogo2" source="{Logo}"/>

</mx:Application>

 

或

 

<?xml version="1.0" encoding="utf-8"?>
<mx:Application <!-- http://yecon.blog.hexun.com/29628260_d.html -->
    xmlns:mx="http://www.adobe.com/2006/mxml" 
    viewSourceURL="src/EmbeddingAnImage/index.html"
    width="200" height="240">

    <mx:Image id="myLogo" source="@Embed('assets/logo.png')"/>

</mx:Application>

 

 

2. 可以在Flex应用程序中嵌入image，并且可以将它应用于组件的皮肤

可以定义一个CSS选择器，以设置所有组件的皮肤

<?xml version="1.0" encoding="utf-8"?><!-- http://yecon.blog.hexun.com/29628260_d.html -->
<mx:Application 
    xmlns:mx="http://www.adobe.com/2006/mxml" 
    viewSourceURL="src/EmbeddingImagesCSS/index.html"
    layout="horizontal" width="270" height="100"
    horizontalAlign="center" verticalAlign="middle">

    <mx:Style>
        Button 
        {
            upSkin: Embed("assets/box_closed.png");
            overSkin: Embed("assets/box.png");
            downSkin: Embed("assets/box_new.png");
        }
    </mx:Style>
    
    <mx:Button/>
    
    <mx:Text text="Roll over and click the box!"/>

</mx:Application>

 

3. 嵌入SWF文件的方法与嵌入IMAGE的方法差不多，只是可以把已嵌入的SWF文件实例当做MovieClip类

（不可直接访问嵌入SWF文件的属性和方法，但是可以使用LocalConnection来允许他们之间的通信）

 

<?xml version="1.0" encoding="utf-8"?><!-- http://yecon.blog.hexun.com/29628260_d.html -->
<mx:Application 
    xmlns:mx="http://www.adobe.com/2006/mxml" 
     viewSourceURL="src/EmbeddingSwfFiles/index.html"
    layout="horizontal" width="290" height="290"
    horizontalAlign="center" verticalAlign="middle"
 >

    <mx:Script>
    <![CDATA[
            [Embed(source="assets/hourglass.swf")]
            [Bindable]
            public var Hourglass:Class;            
        ]]>
    </mx:Script>

    <mx:Image id="hourglass" source="{Hourglass}"/>
</mx:Application>

 

 可以嵌入存在于应用程序的SWF文件库里的特殊标签。

 Flash定义了三种类型的标签：Button、MovieClip、Graphic。可以嵌入Button和MovieClip标签到Flex应用程序，但是不能嵌入Graphic标签。

 

<?xml version="1.0" encoding="utf-8"?><!-- http://yecon.blog.hexun.com/29628260_d.html -->
<mx:Application 
    xmlns:mx="http://www.adobe.com/2006/mxml" 
    viewSourceURL="src/EmbeddingSwfLibraryAssets/index.html"
    layout="horizontal" width="450" height="240"
    horizontalAlign="center" verticalAlign="bottom">
  
    <mx:Script>
    <![CDATA[
            [Embed(source="assets/library.swf", symbol="BadApple")]
            [Bindable]
            public var BadApple:Class;
            
            [Embed(source="assets/library.swf", symbol="Pumpkin")]
            [Bindable]
            public var Pumpkin:Class;
                        
        ]]>
    </mx:Script>

    <mx:Image id="badApple" source="{BadApple}" width="150" height="151.8"/>

    <mx:Image id="pumpkin" source="{Pumpkin}" width="150" height="131.7"/>    

</mx:Application>

 

4. 可以通过使用[Embed]原标签的方法在Flex应用程序中嵌入MP3文件

 

<?xml version="1.0" encoding="utf-8"?><!-- http://yecon.blog.hexun.com/29628260_d.html -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"    layout="vertical" horizontalAlign="center" verticalAlign="center"    viewSourceURL="srcEmbeddingSoundFiles/index.html">

    <mx:Script>
        <![CDATA[
            import mx.core.SoundAsset;
            import flash.media.*;

            [Embed(source="assets/pie-yan-knee.mp3")]
            [Bindable]
            public var Song:Class;

            public var mySong:SoundAsset = new Song() as SoundAsset;
            public var channel:SoundChannel;
            
            public function playSound():void 
            {
                stopSound();
                channel = mySong.play();
            }
            
            public function stopSound():void 
            {
                if ( channel != null ) channel.stop();
            }

        ]]>
    </mx:Script>
    
    <mx:HBox>
        <mx:Button label="play" click="playSound();"/>
        <mx:Button label="stop" click="stopSound();"/>        
    </mx:HBox>
    
    <mx:Text width="348" textAlign="center" color="#ffffff">
        <mx:htmlText>
            <![CDATA[<a href="http://derekaudette.ottawaarts.com/music.php">Pie-Yan-Knee Written and Performed by: Derek R. Audette (c) 2004 (Creative Commons Attribution License)</a>]]>
        </mx:htmlText>
    </mx:Text> 
    
</mx:Application>

 

5. 可以在Flex应用程序中嵌入SVG文件 

<?xml version="1.0" encoding="utf-8"?><!-- http://yecon.blog.hexun.com/29628260_d.html -->
<mx:Application 
    xmlns:mx="http://www.adobe.com/2006/mxml" 
    layout="horizontal" 
    viewSourceURL="srcEmbeddingSvgFiles/index.html"
    width="600" height="470">

    <mx:Script>
    <![CDATA[
            [Embed(source="assets/frog.svg")]
            [Bindable]
            public var SvgFrog:Class;            
        ]]>
    </mx:Script>

    <mx:Image id="smallFrog" source="{SvgFrog}" width="128" height="130"/>

</mx:Application>

 

6. 可以在Flex应用程序中嵌入字体

<?xml version="1.0" encoding="utf-8"?><!-- http://yecon.blog.hexun.com/29628260_d.html -->
<mx:Application 
    xmlns:mx="http://www.adobe.com/2006/mxml" 
    layout="horizontal" 
    horizontalAlign="center" 
    verticalAlign="center" 
    viewSourceURL="src/EmbeddingFonts/index.html">

    <mx:Style>
        @font-face 
        {
            font-family: Copacetix;
            src: url("assets/copacetix.ttf");
            unicode-range:
                U+0020-U+0040, /* Punctuation, Numbers */
                U+0041-U+005A, /* Upper-Case A-Z */
                U+005B-U+0060, /* Punctuation and Symbols */
                U+0061-U+007A, /* Lower-Case a-z */
                U+007B-U+007E; /* Punctuation and Symbols */
        }

        .MyTextStyle 
        { 
            font-family: Copacetix; 
            font-size: 24pt;    
        }

    </mx:Style>

    <mx:Text styleName="MyTextStyle" text="Embedded fonts rock!" width="100%"/>    

</mx:Application>