在Flex4 Spark Application中设置图片背景解决方案汇总

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问题：如何在 Flex4 Spark Application 中添加图片背景？

方案1:自定义含有BitmapGraphic的皮肤类，然后再MXML,CSS,AS中设置skinClass的皮肤样式

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

<s:Application name="Spark_Application_skinClass_test"

xmlns:fx="http://ns.adobe.com/mxml/2009"

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

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

skinClass="skins.CustomApplicationSkin">

<s:layout>

<s:BasicLayout />

</s:layout>

</s:Application>

自定义皮肤类, skins/CustomApplicationSkin.mxml代码如下：

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

<s:Skin name="CustomApplicationSkin"

xmlns:fx="http://ns.adobe.com/mxml/2009"

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

alpha.disabled="0.5" >

<s:states>

<s:State name="normal" />

<s:State name="disabled" />

</s:states>

<fx:Metadata>

<![CDATA[

[HostComponent("spark.components.Application")]

]]>

</fx:Metadata>

<s:BitmapImage id="img"

source="@Embed('image1.jpg')"

smooth="true"

left="0" right="0"

top="0" bottom="0" />

<s:Group id="contentGroup" left="0" right="0" top="0" bottom="0" minWidth="0" minHeight="0" />

</s:Skin>

你也可以通过外部.css样式表文件或者使用<Style/>标签来设置使用skinClass样式

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

<s:Application name="Spark_Application_skinClass_test"

xmlns:fx="http://ns.adobe.com/mxml/2009"

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

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

<s:layout>

<s:BasicLayout />

</s:layout>

<fx:Style>

@namespace s "library://ns.adobe.com/flex/spark";

s|Application {

skinClass: ClassReference("skins.CustomApplicationSkin");

}

</fx:Style>

</s:Application>

或者你可以使用ActionScript来设置skinClass样式，代码如下:

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

<s:Application name="Spark_Application_skinClass_test"

xmlns:fx="http://ns.adobe.com/mxml/2009"

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

xmlns:mx="library://ns.adobe.com/flex/halo"creationComplete=”init();”>

<fx:Script>

<![CDATA[

import skins.CustomApplicationSkin;

protected function init():void {

setStyle("skinClass", CustomApplicationSkin);

}

]]>

</fx:Script>

</s:Application>

方案2：在运行时embedded图片到BitmapFill对象中，修改Application皮肤的backgroundRect皮肤部分的填充属性。代码如下:

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

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"

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

xmlns:ho="library://ns.adobe.com/flex/halo"

xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600"creationComplete="init();">

<fx:Script>

<![CDATA[

import mx.graphics.BitmapFill;

import mx.graphics.BitmapFillMode;

import spark.skins.spark.ApplicationSkin;

[Embed("style/background.jpg")]

protected const BgImg:Class;

protected function init():void{

var bmpFill : BitmapFill = new BitmapFill();

bmpFill.source = BgImg;

bmpFill.fillMode = BitmapFillMode.SCALE;

ApplicationSkin(skin).backgroundRect.fill=bmpFill;

]]>

</fx:Script>

</s:Application>

方案3：扩展默认的Spark包中Application 皮肤，并通过embedded图片来覆盖backgroundRect皮肤部分的填充属性，代码如下:

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

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"

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

xmlns:ho="library://ns.adobe.com/flex/halo"

xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" skinClass="skins.CustomBitmapApplicationSkin">

</s:Application>

扩展的自定义的应用程序皮肤类，skins/CustomBitmapApplicationSkin.as如下：

package skins{

import mx.graphics.BitmapFill;

import mx.graphics.BitmapFillMode;

import spark.skins.spark.ApplicationSkin;

public class CustomBitmapApplicationSkin extends ApplicationSkin{

[Embed("style/background.jpg")]

protected const BgImg:Class;

public function CustomBitmapApplicationSkin(){

super();

var bmpFill:BitmapFill = new BitmapFill();

bmpFill.source=BgImg;

bmpFill.fillMode = BitmapFillMode.SCALE;

backgroundRect.fill = bmpFill;

}

方案4:自定义皮肤类（有别于方案一,不需要BitmapGraphic）实现代码如下:

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

<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"

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

xmlns:ho="library://ns.adobe.com/flex/halo"

xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" skinClass="skins.CustomBitmapApplicationSkin2">

<fx:Style>

@namespace s "library://ns.adobe.com/flex/spark";

s|Application {

backgroundImage: Embed("style/background.jpg");

}

</fx:Style>

</s:Application>

自定义的应用程序皮肤类，skins/CustomBitmapApplicationSkin2.as如下：

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

<s:Skin xmlns:fx="http://ns.adobe.com/mxml/2009"

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

xmlns:fb="http://ns.adobe.com/flashbuilder/2009"

alpha.disabledStates="0.5">

<s:states>

<s:State name="normal" />

<s:State name="disabled" stateGroups="disabledStates" />

<s:State name="normalWithControlBar" stateGroups="controlBarStates" />

<s:State name="disabledWithControlBar" stateGroups="disabledStates,controlBarStates" />

</s:states>

<fx:Metadata>

[HostComponent("spark.components.Application")]

</fx:Metadata>

<fx:Script fb:purpose="styling">

<![CDATA[

override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void {

backgroundRect.setStyle("backgroundAlpha", getStyle("backgroundAlpha"));

backgroundRect.setStyle("backgroundColor", getStyle("backgroundColor"));

if (getStyle("backgroundImage")) {

backgroundRect.setStyle("backgroundImage", getStyle("backgroundImage"));

backgroundRect.setStyle("backgroundImageFillMode", "repeat");

}

super.updateDisplayList(unscaledWidth, unscaledHeight);

}

]]>

</fx:Script>

<!---

A rectangle with a solid color fill that forms the background of the application.

The color of the fill is set to the Application's backgroundColor property.

-->

<s:BorderContainer id="backgroundRect"

backgroundColor="#FFFFFF"

borderVisible="false"

left="0" right="0" top="0" bottom="0" />

<s:Group left="0" right="0" top="0" bottom="0">

<s:layout>

<s:VerticalLayout gap="0" horizontalAlign="justify" />

</s:layout>

<s:Group id="topGroup"

minWidth="0" minHeight="0"

includeIn="controlBarStates" >

<s:Rect left="0" right="0" top="0" bottom="1" >

<s:stroke>

<s:LinearGradientStroke rotation="90" weight="1">

<s:GradientEntry color="0xFFFFFF" />

<s:GradientEntry color="0xD8D8D8" />

</s:LinearGradientStroke>

</s:stroke>

</s:Rect>

<s:Rect left="1" right="1" top="1" bottom="2" >

<s:fill>

<s:LinearGradient rotation="90">

<s:GradientEntry color="0xEDEDED" />

<s:GradientEntry color="0xCDCDCD" />

</s:LinearGradient>

</s:fill>

</s:Rect>

<s:Rect left="0" right="0" bottom="0" height="1" alpha="0.55">

<s:fill>

<s:SolidColor color="0x000000" />

</s:fill>

</s:Rect>

<s:Group id="controlBarGroup"

left="0" right="0" top="1" bottom="1"

minWidth="0" minHeight="0">

<s:layout>

<s:HorizontalLayout paddingLeft="10" paddingRight="10" paddingTop="7" paddingBottom="7" gap="10" />

</s:layout>

</s:Group>

<s:Group id="contentGroup"

width="100%" height="100%"

minWidth="0" minHeight="0" />

</s:Group>

</s:Skin>

本人关于Flex4 Spark Application 背景图片设置的解决方案就到此，如有其它更高效，更可行的方案可以分享出来，互相学习。

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