设置NumericStepper控件获得焦点时的边框透明度.

NumericStepper控件的focusAlpha样式学习.
示例：

代码：

<? xml version="1.0" encoding="utf-8" ?>
<!--  http://blog.flexexamples.com/2008/05/23/setting-the-focus-alpha-on-a-numericstepper-control-in-flex/  -->
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"
        layout ="vertical"
        verticalAlign ="middle"
        backgroundColor ="white" >

     < mx:Script >
         <![CDATA[
            import mx.events.NumericStepperEvent;

            private function numericStepper_change(evt:NumericStepperEvent):void {
                // reset focus
                focusManager.setFocus(btn);
                focusManager.setFocus(numericStepper);
            }
         ]]>
     </ mx:Script >

     < mx:ApplicationControlBar  dock ="true" >
         < mx:Button  id ="btn"  label ="click here to remove focus"   />
     </ mx:ApplicationControlBar >

     < mx:NumericStepper  id ="numericStepper"
            minimum ="0.0"
            maximum ="1.0"
            value ="0.5"
            stepSize ="0.1"
            textAlign ="center"
            focusAlpha =" {numericStepper.value} "
            change ="numericStepper_change(event);"   />

</ mx:Application >

你也可以通过CSS设置：

<? xml version="1.0" encoding="utf-8" ?>
<!--  http://blog.flexexamples.com/2008/05/23/setting-the-focus-alpha-on-a-numericstepper-control-in-flex/  -->
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"
        layout ="vertical"
        verticalAlign ="middle"
        backgroundColor ="white" >

     < mx:Style >
        NumericStepper {
            focusAlpha: 1.0;
        }
     </ mx:Style >

     < mx:ApplicationControlBar  dock ="true" >
         < mx:Button  id ="btn"  label ="click here to remove focus"   />
     </ mx:ApplicationControlBar >

     < mx:NumericStepper  id ="numericStepper"
            minimum ="0.0"
            maximum ="1.0"
            value ="1.0"
            stepSize ="0.1"
            textAlign ="center" />

</ mx:Application >

你也可以通过AS设置：

<? xml version="1.0" encoding="utf-8" ?>
<!--  http://blog.flexexamples.com/2008/05/23/setting-the-focus-alpha-on-a-numericstepper-control-in-flex/  -->
< mx:Application  xmlns:mx ="http://www.adobe.com/2006/mxml"
        layout ="vertical"
        verticalAlign ="middle"
        backgroundColor ="white" >

     < mx:Script >
         <![CDATA[
            import mx.events.NumericStepperEvent;

            private function numericStepper_change(evt:NumericStepperEvent):void {
                numericStepper.setStyle("focusAlpha", evt.value);
                // reset focus
                focusManager.setFocus(btn);
                focusManager.setFocus(numericStepper);
            }
         ]]>
     </ mx:Script >

     < mx:ApplicationControlBar  dock ="true" >
         < mx:Button  id ="btn"  label ="click here to remove focus"   />
     </ mx:ApplicationControlBar >

     < mx:NumericStepper  id ="numericStepper"
            minimum ="0.0"
            maximum ="1.0"
            value ="0.5"
            stepSize ="0.1"
            textAlign ="center"
            change ="numericStepper_change(event);"   />

</ mx:Application >