Button

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2023-12-01

介绍 (Introduction)

Button组件是常用的矩形按钮。 Button通常使用事件侦听器在用户选择控件时执行操作。当用户单击Button控件时，它会调度click事件和buttonDown事件。

Class 声明 (Class Declaration)

以下是spark.components.Button类的声明 -

public class Button 
   extends ButtonBase
      implements IButton

公共属性 (Public Properties)

S.No	财产和描述
1	emphasized : Boolean 根据焦点管理器的请求反映默认按钮。

公共方法 (Public Methods)

S.No	方法和描述
1	Button() 构造函数。

方法继承 (Methods Inherited)

该类继承以下类中的方法 -

spark.components.supportClasses.ButtonBase
spark.components.supportClasses.SkinnableComponent
mx.core.UIComponent
mx.core.FlexSprite
flash.display.Sprite
flash.display.DisplayObjectContainer
flash.display.InteractiveObject
flash.display.DisplayObject
flash.events.EventDispatcher
Object

Flex按钮控制示例

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Button控件的用法 -

步	描述
1	在cn.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[
         import mx.controls.Alert;
         import mx.events.FlexEvent;
         protected function button_clickHandler(event:MouseEvent):void {
            Alert.show("Hello World!");				
         }
      ]]>
   </fx:Script>
   <s:BorderContainer width = "550" height = "400" id = "mainContainer" 
      styleName = "container">
      <s:VGroup width = "100%" height = "100%" gap = "50" 
         horizontalAlign = "center" verticalAlign = "middle">
         <s:Label id = "lblHeader" text = "Form Controls Demonstration" 
            fontSize = "40" color = "0x777777" styleName = "heading" />
         <s:Panel id = "buttonPanel" title = "Using Button" width = "400" 
            height = "200" includeInLayout = "true" visible = "true">
            <s:layout>
               <s:HorizontalLayout  gap = "10" verticalAlign = "middle" 
                  horizontalAlign = "center" />	
            </s:layout>
            <s:Button id = "clickMeButton" label = "Click Me" 
               click = "button_clickHandler(event)" />
            <s:Button id = "disabledButton" label = "Disabled Button" 
               enabled = "false" />
            <s:Button id = "emphasizedButton" label = "Emphasized Button" 
               emphasized = "true" click = "button_clickHandler(event)" />
         </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。