Flex - 按鈕控制元件

介紹

Button 元件是一個常用的矩形按鈕。按鈕通常使用事件監聽器來在使用者選擇控制元件時執行操作。當用戶點選 Button 控制元件時，它會分派一個 click 事件和一個 buttonDown 事件。

類宣告

以下是spark.components.Button類的宣告：

public class Button 
   extends ButtonBase
      implements IButton

公共屬性

公共方法

繼承的方法

此類繼承自以下類的方法：

• 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 按鈕控制元件示例

讓我們按照以下步驟，透過建立一個測試應用程式來檢查在 Flex 應用程式中使用 Button 控制元件：

以下是修改後的 mxml 檔案src/com.tutorialspoint/HelloWorld.mxml的內容。

<?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/tutorialspoint/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>

完成所有更改後，讓我們像在Flex - 建立應用程式章節中一樣，在普通模式下編譯並執行應用程式。如果應用程式一切正常，它將產生以下結果：[線上試用]