Flex4 scroller 自定义皮肤

十月 15, 2010

Posted by admin

flex4里引入了sparkSkin, spark包里的可视控件可以通过指定skinClass的值来修改控件的默认皮肤。

下面是一个如何自定义某个scrollbar的外观的例子。

新建一个flex project, 名字假设为myScrollerbar, 编辑mxml内容：

<?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:mx="library://ns.adobe.com/flex/mx" width="300" height="400" ><fx:Declarations><!-- Place non-visual elements (e.g., services, value objects) here --></fx:Declarations>     <s:Scroller percentWidth="100" percentHeight="100" id="scroller"><s:Group><s:Rect percentWidth="100" height="800"><s:fill><s:LinearGradient rotation='250'><s:GradientEntry color='0x000000' ratio='0'/><s:GradientEntry color='0xffffff' ratio='1'/></s:LinearGradient></s:fill></s:Rect></s:Group>      </s:Scroller>
</s:Application>

编译运行程序，截图如下：

假设我们现在想改变右边verticalScrollbar的样子， 并且已经准备好了所需要的图片：
up.png: 向上箭头的图片
down.png: 向下箭头的图片
thumb.png: 拖动条的图片

Scroller.verticalScrollbar 实际上是由4部分构成，
thumb： 拖动条 (对应的类为spark.components.Button)
track: 拖动条下面的那个轨道 (对应的类为spark.components.Button)
decrementButton： 向上箭头按钮(对应的类为spark.components.Button)
incrementButton: 向下箭头按钮(对应的类为spark.components.Button)

对整个verticalScrollbar我们需要一个mxml来定义其皮肤， 里面每个部分也分别需要一个mxml来定义皮肤，那么我们一共需要5个mxml文件

下面是这5个mxml皮肤文件的定义：

1. MyVScrollBarSkin.mxml

<?xml version="1.0" encoding="utf-8"?>
<s:SparkSkin xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:mx="library://ns.adobe.com/flex/mx"
alpha.disabled="0.5"
alpha.inactive="0.5"><s:states><s:State name="normal" /><s:State name="disabled" /><s:State name="inactive" /></s:states><fx:Metadata><![CDATA[
[HostComponent("spark.components.VScrollBar")]
]]></fx:Metadata> <s:Button id="track" top="30" bottom="30" focusEnabled="false" horizontalCenter="0"
skinClass="skins.MyVScrollBarTrackSkin"
/><s:Button id="thumb" focusEnabled="false" horizontalCenter="0"
skinClass="skins.MyVScrollBarThumbSkin"
/><s:Button id="decrementButton" top="0"  focusEnabled="false" horizontalCenter="0"
skinClass="skins.MyVScrollBarDecrementButtonSkin"
/><s:Button id="incrementButton" bottom="0"  focusEnabled="false" horizontalCenter="0"
skinClass="skins.MyVScrollBarIncrementButtonSkin"
/>
</s:SparkSkin>

2.MyVScrollBarThumbSkin.mxml

<?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:mx="library://ns.adobe.com/flex/mx"
xmlns:pwg="com.perfectworld.gamelibs.pwgraphics.*"><fx:Metadata>[HostComponent("spark.components.Button")]</fx:Metadata><s:states><s:State name="up" /><s:State name="over" /><s:State name="down" /><s:State name="disabled" /></s:states><mx:Image  source="@Embed('thumb.png')" /></s:Skin>

3.MyVScrollBarTrackSkin.mxml

<?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:mx="library://ns.adobe.com/flex/mx"
xmlns:pwg="com.perfectworld.gamelibs.pwgraphics.*"><fx:Metadata>[HostComponent("spark.components.Button")]</fx:Metadata><s:states><s:State name="up" /><s:State name="over" /><s:State name="down" /><s:State name="disabled" /></s:states><s:Rect top="0" bottom="0" width="29"><s:fill><s:SolidColor  color="0x131313" alpha="0.3" /></s:fill></s:Rect></s:Skin>

4.MyVScrollBarDecrementButtonSkin.mxml

<?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:mx="library://ns.adobe.com/flex/mx"
xmlns:pwg="com.perfectworld.gamelibs.pwgraphics.*"
><fx:Metadata>[HostComponent("spark.components.Button")]</fx:Metadata><s:states><s:State name="up" /><s:State name="over" /><s:State name="down" /><s:State name="disabled" /></s:states><mx:Image  source="@Embed('up.png')"/>
</s:Skin>

5. MyVScrollBarIncrementButtonSkin.mxml

<?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:mx="library://ns.adobe.com/flex/mx"
xmlns:pwg="com.perfectworld.gamelibs.pwgraphics.*"
><fx:Metadata>[HostComponent("spark.components.Button")]</fx:Metadata><s:states><s:State name="up" /><s:State name="over" /><s:State name="down" /><s:State name="disabled" /></s:states><mx:Image  source="@Embed('down.png')"/>
</s:Skin>

皮肤文件定义好了，那么现在修改mySCrollbar.mxml为 scroller.verticalScrollbar指定skinClass:

<?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:mx="library://ns.adobe.com/flex/mx" width="300" height="400" creationComplete="init()"><fx:Declarations><!-- Place non-visual elements (e.g., services, value objects) here --></fx:Declarations><fx:Script><![CDATA[
import skins.MyVScrollBarSkin;
private function init():void {
scroller.verticalScrollBar.setStyle("skinClass", MyVScrollBarSkin);
scroller.verticalScrollBar.setStyle( "fixedThumbSize", true);
}
]]></fx:Script><s:Scroller percentWidth="100" percentHeight="100" id="scroller"><s:Group><s:Rect percentWidth="100" height="800"><s:fill><s:LinearGradient rotation='250'><s:GradientEntry color='0x000000' ratio='0'/><s:GradientEntry color='0xffffff' ratio='1'/></s:LinearGradient></s:fill></s:Rect></s:Group>       </s:Scroller>
</s:Application>

主要是加了这2行代码：

scroller.verticalScrollBar.setStyle("skinClass", MyVScrollBarSkin);
scroller.verticalScrollBar.setStyle( "fixedThumbSize", true);

最后的样子如下：