的方法。如下圖所示:
本文將通過以下幾步來實現:
一、繼承SkinnableContainer,創建組件類GroupBox。
二、聲明外觀部件titleDisplay用來顯示組合框的標題。
三、增加title屬性。
四、覆蓋partAdded方法,使標題字符串能夠作用於外觀部件titleDisplay。
五、創建它的默認外觀(皮膚)GroupBoxSkin。
六、爲GroupBox增加必要樣式。
---------------
一、繼承SkinnableContainer,創建組件類GroupBox。
public class GroupBox extends SkinnableContainer
{
public function GroupBox()
{
super();
}
}
二、聲明外觀部件titleDisplay用來顯示組合框的標題。
三、增加title屬性。
private var _title:String = "";
[Bindable]
public function get title():String
{
return _title;
}
public function set title(value:String):void
{
_title = value;
if (titleDisplay)
titleDisplay.text = title;
}
四、覆蓋partAdded方法,使標題字符串能夠作用於外觀部件titleDisplay。
至此,GroupBox組件類基本創建完成,但是還不能顯示。下面來創建它的默認外觀(皮膚)GroupBoxSkin。
五、創建它的默認外觀(皮膚)GroupBoxSkin。
第一步,創建組合框的邊框。
第二步,創建外觀部件titleDisplay。
第三步,創建外觀部件contentGroup,用於包含組合框的內容。
注意,此時邊框是一個閉合的矩形。
圖2
從上圖,可以看出現在組合框的標題文字與邊框是重疊的,顯然這不符合我們的要求。
爲了解決這個問題,下面要爲邊框創建一個遮罩。
<!-- 邊框遮罩 -->
<s:Group id="borderGroupMask" left="0" right="0" top="0" bottom="0">
<s:Rect left="0" width="7" top="0" bottom="0">
<s:fill>
<s:SolidColor color="#ff0000" alpha="1"/>
</s:fill>
</s:Rect>
<s:Rect left="7" width="{titleDisplay.width+4}" top="30" bottom="0">
<s:fill>
<s:SolidColor color="#ff0000" alpha="1"/>
</s:fill>
</s:Rect>
<s:Rect left="{titleDisplay.width+11}" width="100%" top="0" bottom="0">
<s:fill>
<s:SolidColor color="#ff0000" alpha="1"/>
</s:fill>
</s:Rect>
</s:Group>
爲<s:Rect id="border"/>增加屬性:mask="{borderGroupMask}"。
六、爲GroupBox增加必要樣式。
第一步,在GroupBox類中增加以下樣式聲明,它們用來指定邊框的顏色和圓角。
增加borderColor樣式。
第二步,在GroupBoxSkin中覆蓋updateDisplayList,把樣式應用於外觀。
override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
{
var cr:Number = getStyle("cornerRadius");
if (cornerRadius != cr)
{
cornerRadius = cr; // 取變量
border.topLeftRadiusX = cornerRadius;
border.topRightRadiusX = cornerRadius;
border.bottomLeftRadiusX = cornerRadius;
border.bottomRightRadiusX = cornerRadius;
}
borderStroke.color = getStyle("borderColor");
borderStroke.alpha = getStyle("borderAlpha");
//
super.updateDisplayList(unscaledWidth, unscaledHeight);
}
至此所有工作完成。效果如下:
圖3
完整的文件如下:
1 GroupBox.as
package jx.components
{
import spark.components.SkinnableContainer;
import spark.components.supportClasses.TextBase;
/**
* The alpha of the border for this component.
*
* @default 0.5
*
* @langversion 3.0
* @playerversion Flash 10
* @playerversion AIR 1.5
* @productversion Flex 4
*/
[Style(name="borderAlpha", type="Number", inherit="no", theme="spark")]
/**
* The color of the border for this component.
*
* @default 0
*
* @langversion 3.0
* @playerversion Flash 10
* @playerversion AIR 1.5
* @productversion Flex 4
*/
[Style(name="borderColor", type="uint", format="Color", inherit="no", theme="spark")]
/**
* The radius of the corners for this component.
*
* @default 5
*
* @langversion 3.0
* @playerversion Flash 10
* @playerversion AIR 1.5
* @productversion Flex 4
*/
[Style(name="cornerRadius", type="Number", format="Length", inherit="no", theme="spark")]
public class GroupBox extends SkinnableContainer
{
public function GroupBox()
{
super();
}
//----------------------------------
// titleField
//----------------------------------
[SkinPart(required="false")]
/**
* 定義容器中標題文本的外觀的外觀部件。
*
* @see jx.skins.GroupBoxSkin
*
* @langversion 3.0
* @playerversion Flash 10
* @playerversion AIR 1.5
* @productversion Flex 4
*/
public var titleDisplay:TextBase;
//----------------------------------
// title
//----------------------------------
/**
* @private
*/
private var _title:String = "";
/**
* @private
*/
private var titleChanged:Boolean;
[Bindable]
/**
* 標題或者說明。
* @default ""
* @langversion 3.0
* @playerversion Flash 10
* @playerversion AIR 1.5
* @productversion Flex 4
*/
public function get title():String
{
return _title;
}
/**
* @private
*/
public function set title(value:String):void
{
_title = value;
if (titleDisplay)
titleDisplay.text = title;
}
override protected function partAdded(partName:String, instance:Object):void
{
super.partAdded(partName, instance);
if (instance == titleDisplay)
{
titleDisplay.text = title;
}
}
}
}
2 GroupBoxSkin.mxml
<?xml version="1.0" encoding="utf-8"?>
<s:SparkSkin xmlns:fx="http://ns.adobe.com/mxml/2009"
xmlns:mx="library://ns.adobe.com/flex/mx"
xmlns:s="library://ns.adobe.com/flex/spark"
xmlns:fb="http://ns.adobe.com/flashbuilder/2009"
alpha.disabled="0.5">
<fx:Metadata>
[HostComponent("jx.components.GroupBox")]
</fx:Metadata>
<fx:Script fb:purpose="styling">
static private const exclusions:Array = ["titleDisplay", "contentGroup"];
/**
* @private
*/
override public function get colorizeExclusions():Array {
return exclusions;
}
/**
* @private
*/
override protected function initializationComplete():void
{
useChromeColor = true;
super.initializationComplete();
}
private var cornerRadius:Number;
/**
* @private
*/
override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void
{
var cr:Number = getStyle("cornerRadius");
if (cornerRadius != cr)
{
cornerRadius = cr; // 取變量
border.topLeftRadiusX = cornerRadius;
border.topRightRadiusX = cornerRadius;
border.bottomLeftRadiusX = cornerRadius;
border.bottomRightRadiusX = cornerRadius;
}
borderStroke.color = getStyle("borderColor");
borderStroke.alpha = getStyle("borderAlpha");
//
super.updateDisplayList(unscaledWidth, unscaledHeight);
}
</fx:Script>
<s:states>
<s:State name="normal" />
<s:State name="disabled" />
</s:states>
<!-- 邊框遮罩 -->
<s:Group id="borderGroupMask" left="0" right="0" top="0" bottom="0">
<s:Rect left="0" width="7" top="0" bottom="0">
<s:fill>
<s:SolidColor color="#ff0000" alpha="1"/>
</s:fill>
</s:Rect>
<s:Rect left="7" width="{titleDisplay.width+4}" top="30" bottom="0">
<s:fill>
<s:SolidColor color="#ff0000" alpha="1"/>
</s:fill>
</s:Rect>
<s:Rect left="{titleDisplay.width+11}" width="100%" top="0" bottom="0">
<s:fill>
<s:SolidColor color="#ff0000" alpha="1"/>
</s:fill>
</s:Rect>
</s:Group>
<!-- 邊框 -->
<s:Rect id="border" left="0" right="0" top="10" bottom="0"
radiusX="4" radiusY="4"
mask="{borderGroupMask}"
><!--mask="{borderGroupMask}"-->
<s:stroke>
<s:SolidColorStroke id="borderStroke" weight="1"/>
</s:stroke>
</s:Rect>
<!-- 標題 -->
<s:Label id="titleDisplay"
maxDisplayedLines="1"
left="9" top="0"
minHeight="20"
verticalAlign="middle"
textAlign="start"/>
<!-- 內容區域 -->
<s:Group id="contentGroup"
left="5" right="5" top="21" bottom="5">
<s:layout>
<s:VerticalLayout/>
</s:layout>
</s:Group>
</s:SparkSkin>
3 GroupBoxExam.mxml 實例文件
<?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" minWidth="955" minHeight="600" xmlns:components="jx.components.*">
<s:layout>
<s:BasicLayout/>
</s:layout>
<fx:Declarations>
</fx:Declarations>
<components:GroupBox skinClass="jx.skins.GroupBoxSkin" title="用戶配置文件" cornerRadius="5">
<components:layout>
<s:HorizontalLayout/>
</components:layout>
<s:Button/>
<s:Button/>
<s:Button/>
</components:GroupBox>
</s:Application>
4 css
可以通過css爲GroupBox指定樣式的默認值。
5 代碼方式指定組件的默認CSS樣式
private static const classConstructed:Boolean = classConstruct();
// 指定默認樣式
private static function classConstruct():Boolean {
var styleManager:IStyleManager2 = FlexGlobals.topLevelApplication.styleManager;
if (!styleManager.getStyleDeclaration("jx.components.GroupBox")) {
var css:CSSStyleDeclaration = new CSSStyleDeclaration(null, styleManager);
css.defaultFactory = function():void {
this.skinClass = GroupBoxSkin;
this.borderAlpha = 1;
this.borderColor = 0; // 黑
// this.borderColor = 0xD3D3D3; // 灰
// this.borderColor = 0x104778; // 藍
this.cornerRadius = 5;
// this.dropShadowVisible = true;
// this.borderWeight = 1;
}
styleManager.setStyleDeclaration("jx.components.GroupBox", css, true);
}
return true;
}