Fade

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2023-12-01

介绍 (Introduction)

淡化效果可动画化组件的alpha属性。 如果在具有可见属性为false的对象上播放,并设置为从零到非零值的动画alpha,则会将对象可见设置为true作为淡入其中的副作用。

Class 声明 (Class Declaration)

以下是spark.effects.Fade类的声明 -

public class Fade
   extends Animate

公共属性 (Public Properties)

S.No财产和描述
1

alphaFrom : Number

alpha属性的初始值,介于0.0和1.0之间,其中0.0表示透明,1.0表示完全不透明。

2

alphaTo : Number

alpha属性的最终值,介于0.0和1.0之间,其中0.0表示透明,1.0表示完全不透明。

公共方法 (Public Methods)

S.No方法和描述
1

Fade(target:Object = null)

构造函数。

方法继承 (Methods Inherited)

该类继承以下类中的方法 -

  • spark.effects.Animate
  • mx.effects.Effect
  • flash.events.EventDispatcher
  • Object

Flex Fade效果示例

让我们按照以下步骤通过创建测试应用程序来检查Flex应用程序中淡入淡出效果的用法 -

描述
1cn.xnip.client包下创建一个名为HelloWorld的项目,如Flex - Create Application一章中所述。
2修改HelloWorld.mxml ,如下所述。 保持其余文件不变。
3编译并运行应用程序以确保业务逻辑按照要求运行。

以下是修改后的mxml文件src/cn.xnip/HelloWorld.mxml

<?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 = "100%" height = "100%" minWidth = "500" minHeight = "500">
   <fx:Style source = "/com/xnip/client/Style.css" />
   <fx:Script>
      <![CDATA[
         protected function btnFadeIn_clickHandler
            (event:MouseEvent):void {
            fadeIn.play();
         }
         protected function btnFadeOut_clickHandler
            (event:MouseEvent):void {
            fadeOut.play();
         }
      ]]>
   </fx:Script>
   <fx:Declarations>
      <s:Fade id = "fadeIn" duration = "2000" target = "{imageFlex}" 
         alphaFrom = "0" alphaTo = "1" />
      <s:Fade id = "fadeOut" duration = "2000" target = "{imageFlex}" 
         alphaFrom = "1" alphaTo = "0" />		   
   </fx:Declarations>
   <s:BorderContainer width = "630" height = "480" id = "mainContainer" 
      styleName = "container">
      <s:VGroup width = "100%" height = "100%" gap = "50" 
         horizontalAlign = "center" verticalAlign = "middle">
         <s:Label id = "lblHeader" text = "Effects Demonstration" 
            fontSize = "40" color = "0x777777" styleName = "heading" />
         <s:Panel id = "fadePanel" title = "Using Fade Effect" 
            width = "500" height = "300" includeInLayout = "true" visible = "true">
            <s:layout>
               <s:VerticalLayout  gap = "10" verticalAlign = "middle" 
                  horizontalAlign = "center" />
            </s:layout>			
            <s:Image id = "imageFlex" 
               source = "https://www.xnip.cn/images/flex-mini.png" />
            <s:HGroup>						
               <s:Button id = "btnFadeOut" label = "Fade Out" 
                  click = "btnFadeOut_clickHandler(event)" />
               <s:Button id = "btnFadeIn" label = "Fade In" 
                  click = "btnFadeIn_clickHandler(event)" />
            </s:HGroup>
          </s:Panel>
       </s:VGroup>	 
    </s:BorderContainer>	
</s:Application>

一旦准备好完成所有更改,让我们像在Flex - Create Application章节中那样在正常模式下编译和运行应用程序

Flex Fade效果