如何为TabNavigator按钮设置风格或皮肤？

Question

我想在Flex 4中为TabNavigator添加一个图标和一个关闭按钮，但在线找不到任何示例（全部用于Flex 3）。

<mx:TabNavigator id="firstViewStack" 
       width="100%" 
       height="100%" 
       clipContent="true"> 

    <s:NavigatorContent label="FIRST TAB" > 
     <s:Group width="100%" /> 
    </s:NavigatorContent> 

</mx:TabNavigator> 

Answer 1

ZOMGWTH？！？！？！这花了太长时间才弄清楚。这是你如何设置默认标签皮肤：

mx|Tab { 
    skin:ClassReference("mx.skins.spark.TabSkin"); 
} 

您可以复制皮肤到自己的项目，并根据需要进行修改：

下面是一些例子。这会修改所有TabNavigators所有标签：

mx|Tab { 
    skin:ClassReference("mySkins.MyTabSkin"); 
} 

皮肤只有一个TabNavigator的：

<mx:TabNavigator id="tabBarNavigator" styleName="myTabNavigator"> 

    <s:NavigatorContent label="First Tab" > 
      <s:Group width="100%" /> 
    </s:NavigatorContent> 

    <s:NavigatorContent label="Second Tab"> 
     <s:Group height="100%" width="100%" /> 
    </s:NavigatorContent> 
</mx:TabNavigator> 


<fx:Style> 
    @namespace s "library://ns.adobe.com/flex/spark"; 
    @namespace utils "com.flexcapacitor.utils.*"; 
    @namespace mx "library://ns.adobe.com/flex/mx"; 

    .myTabNavigator { 
     tabStyleName: "myTabs"; 
    } 

    .myTabs { 
     skin:ClassReference("mySkins.MyTabSkin"); 
    } 
</fx:Style> 

这个工程使用Flex 4.6和Spark主题。

更新2：
这里有一些更值得注意的风格：

.myTabs { 
    skin:ClassReference("skins.SolidFillTabSkin"); 
    fillAlpha:1; 
    borderAlpha:1; 
    cornerRadius:0; 
    /*color:#FF0000; 
    chromeColor: #00FF00; 
    textRollOverColor: #0000FF; 
    textSelectedColor: #00FF00;*/ 
    textFieldClass: ClassReference("mx.core.UIFTETextField"); /* default is mx.core.UITextField*/ 
} 

的textSelectedColor几乎永远不会触发。所以从来没有选定的文字颜色。此外，选择标签时文本向下移动！

所以下面是一个新的皮肤，文字不会向下移动。如果您不想使用默认值，您可能需要设置文本并在皮肤中填充颜色，但您可以使用chromeColor设置填充颜色。这种皮肤支持cornerRadius和borderAlpha，

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

<!-- 
Apache License 2.0. 
--> 

<!--- The Spark skin class for the tabs of the MX TabNavigator container. 

How to use: 

With a specific TabNavigator: 

.myTabNavigator { 
    tabStyleName: "myTabs"; 
} 

.myTabs { 
    skin:ClassReference("mySkins.MyTabSkin"); 
} 

Applied to all Tabs in all TabNavigators: 

mx|Tab { 
    skin:ClassReference("com.flexcapacitor.skins.SolidFillTabNavigatorButtonSkin"); 
    fillAlpha:1; 
    borderAlpha:1; 
    cornerRadius:0; 
    /*color:#FF0000; 
    chromeColor: #00FF00; 
    textRollOverColor: #0000FF; 
    textSelectedColor: #00FF00;*/ 
    textFieldClass: ClassReference("mx.core.UIFTETextField"); /* default is mx.core.UITextField*/ 
} 

@see mx.containers.TabNavigator 

@langversion 3.0 
@playerversion Flash 10 
@playerversion AIR 1.5 
@productversion Flex 4 
--> 
<s:SparkSkin xmlns:fx="http://ns.adobe.com/mxml/2009" xmlns:s="library://ns.adobe.com/flex/spark" 
      minWidth="21" minHeight="21" 
      alpha.disabledStates="0.5"> 

    <fx:Script> 
    <![CDATA[ 
     import mx.controls.Button; 
     import mx.core.IUITextField; 
     import mx.core.mx_internal; 

     use namespace mx_internal; 

     private var cornerRadius:Number = 0; 

     /** 
     * @private 
     */ 
     override protected function initializationComplete():void 
     { 
      useChromeColor = true; 
      super.initializationComplete(); 
     } 

     /** 
     * COPIED FROM TabBarButtonSkin.mxml 
     * @private 
     * The cornerRadius style is specified by the TabBar, not the button itself. 
     * 
     * Rather than bind the corner radius properties of the s:Rect's in the markup 
     * below to hostComponent.owner.getStyle("cornerRadius"), we reset them here, 
     * each time a change in the value of the style is detected. Note that each 
     * corner radius property is explicitly initialized to the default value of 
     * the style; the initial value of the private cornerRadius property. 
     */ 
     private function updateCornerRadius():void 
     { 
      var cr:Number = getStyle("cornerRadius"); 
      if (cornerRadius != cr) 
      { 
       cornerRadius = cr; 
       fill.topLeftRadiusX = cornerRadius; 
       fill.topRightRadiusX = cornerRadius; 
      } 
     } 

     /** 
     * COPIED FROM TabBarButtonSkin.mxml 
     * @private 
     * This function creates the path data used by borderTop and selectedHighlight. 
     */ 
     private function createPathData(isBorder:Boolean):String 
     { 
      var left:Number = 0; 
      var right:Number = width; 
      var top:Number = 0.5; 
      var bottom:Number = height; 

      var a:Number = cornerRadius * 0.292893218813453; 
      var s:Number = cornerRadius * 0.585786437626905; 

      // If the path is for the highlight, 
      // Draw the vertical part of the selected tab highlight that's rendered 
      // with alpha=0.07. The s:Path is configured to include only the left and 
      // right edges of an s:Rect, along with the top left,right rounded corners. 
      // Otherwise, we draw a full path. 
      var path:String = ""; 
      path += "M " + left + " " + bottom; 
      path += " L " + left + " " + (top + cornerRadius); 
      path += " Q " + left + " " + (top + s) + " " + (left + a) + " " + (top + a); 
      path += " Q " + (left + s) + " " + top + " " + (left + cornerRadius) + " " + top; 

      if (isBorder) 
       path += " L " + (right - cornerRadius) + " " + top; 
      else 
       path += " M " + (right - cornerRadius) + " " + top; 

      path += " Q " + (right - s) + " " + top + " " + (right - a) + " " + (top + a); 
      path += " Q " + right + " " + (top + s) + " " + right + " " + (top + cornerRadius); 
      path += " L " + right + " " + bottom; 

      return path; 
     } 

     /** 
     * COPIED FROM TabBarButtonSkin.mxml 
     * @private 
     * The borderTop s:Path is just a s:Rect with the bottom edge left out. 
     * Given the rounded corners per the cornerRadius style, the result is 
     * roughly an inverted U with the specified width, height, and cornerRadius. 
     * 
     * Circular arcs are drawn with two curves per flash.display.Graphics.GraphicsUtil. 
     */   
     private function updateBorderTop(width:Number, height:Number):void 
     { 
      // Generate path data and lay it out. The path is not being layout by the default BasicLayout of this skin 
      // since we excluded it from the layout. 
      var path:String = createPathData(true); 
      borderTop.data = path; 
      borderTop.setLayoutBoundsSize(width, height, false); 
      borderTop.setLayoutBoundsPosition(0, 0, false); 
     } 

     /** 
     * @private 
     */ 
     override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number) : void 
     { 
      updateCornerRadius(); 
      updateBorderTop(unscaledWidth, unscaledHeight); 

      var button:Button = owner as Button;// is the Button 
      var textField:IUITextField = button.getTextField(); 
      var label:String = button.label; 

      // if you want to use your own text field hide the other one here 
      if (textField) { 
       //textField.includeInLayout = false; 
       textField.visible = false; 
      } 

      if (labelDisplay) { 
       labelDisplay.text = label; 
      } 

      var borderAlpha:Number = button.getStyle("borderAlpha"); 
      if (!isNaN(borderAlpha)) { 
       borderTop.alpha = borderAlpha; 
       if (lineAlongTheBottom) { 
        lineAlongTheBottom.alpha = borderAlpha; 
       } 
      } 

      var fillAlpha:Number = button.getStyle("fillAlpha"); 
      if (!isNaN(fillAlpha)) { 
       fillColor.alpha = fillAlpha; 
      } 

      var fillColorValue:Number = button.getStyle("fillColor"); 
      if (!isNaN(fillColorValue)) { 
       //fillColor.color = fillColorValue; 
      } 

      super.updateDisplayList(unscaledWidth, unscaledHeight); 

     } 
     ]]> 
    </fx:Script> 

    <!-- states --> 
    <s:states> 
     <s:State name="up" /> 
     <s:State name="over" /> 
     <s:State name="down" /> 
     <s:State name="disabled" stateGroups="disabledStates"/> 
     <s:State name="selectedUp" stateGroups="selectedStates" /> 
     <s:State name="selectedOver" stateGroups="selectedStates" /> 
     <s:State name="selectedDown" stateGroups="selectedStates" /> 
     <s:State name="selectedDisabled" stateGroups="disabledStates, selectedStates" /> 
    </s:states> 

    <!-- layer 1: fill --> 
    <s:Rect id="fill" left="1" right="1" top="1" bottom="0" > 
     <s:fill> 
      <s:SolidColor id="fillColor" 
          color="0xFFFFFF" 
          color.selectedStates="0xECEEEE" 
          color.over="0xECEEEE" 
          alpha="1" /> 
<!--   <s:LinearGradient rotation="90"> 
       <s:GradientEntry color="0xE4E4E4" color.over="0xCACACA" 
           color.selectedStates="0xFFFFFF" 
           alpha="1" /> 
       <s:GradientEntry color="0xA1A1A1" color.over="0x878787" 
           color.selectedStates="0xE4E4E4" 
           alpha="1" /> 
      </s:LinearGradient>--> 
     </s:fill> 
    </s:Rect> 


    <!-- layer 4: border - unselected only --> 
    <s:Line id="lineAlongTheBottom" left="0" right="0" bottom="0" excludeFrom="selectedStates" > 
     <s:stroke> 
      <s:SolidColorStroke color="0x696969" alpha="1" /> 
     </s:stroke> 
    </s:Line> 

    <!--- Set includeInLayout="false" as we regenerate the path data and lay out the path in 
    the updateDisplayList() override and we don't want it to affect measurement. @private 
    --> 
    <s:Path id="borderTop" left="0" right="0" top="0" bottom="0" includeInLayout="false"> 
     <s:stroke> 
      <s:LinearGradientStroke rotation="90" weight="1"> 
       <s:GradientEntry color="0x000000" 
           alpha="0.5625" 
           alpha.down="0.6375" 
           alpha.selectedStates="0.6375" /> 
       <s:GradientEntry color="0x000000" 
           alpha="0.75" 
           alpha.down="0.85" 
           alpha.selectedStates="0.85" /> 
      </s:LinearGradientStroke> 
     </s:stroke> 
    </s:Path> 

    <!-- layer 8: text --> 
    <!--- @copy spark.components.supportClasses.ButtonBase#labelDisplay --> 
    <s:Label id="labelDisplay" 
      visible="true" 
      textAlign="center" 
      verticalAlign="middle" 
      maxDisplayedLines="1" 
      horizontalCenter="0" verticalCenter="2" 
      left="10" right="10" top="2" bottom="2"> 
    </s:Label> 
</s:SparkSkin>