RadioButton
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2023-12-01
介绍 (Introduction)
RadioButton控件允许用户在一组互斥选项中做出单一选择。
Class 声明 (Class Declaration)
以下是spark.components.RadioButton类的声明 -
public class RadioButton
extends ToggleButtonBase
implements IFocusManagerGroup
公共属性 (Public Properties)
S.No | 属性和描述 |
---|---|
1 | enabled : Boolean [override]如果启用了RadioButtonGroup并且启用了RadioButton本身,则启用RadioButton组件。 |
2 | group : RadioButtonGroup RadioButton所属的RadioButtonGroup组件。 |
3 | groupName : String 指定此RadioButton组件所属的组的名称,或者如果此RadioButton是RadioButtonGroup组件定义的组的一部分,则指定RadioButtonGroup组件的id属性的值。 |
4 | value : Object 与RadioButton组件关联的可选用户定义值。 |
公共方法 (Public Methods)
S.No | 方法和描述 |
---|---|
1 | RadioButton() 构造函数。 |
方法继承 (Methods Inherited)
该类继承以下类中的方法 -
- spark.components.supportClasses.ToggleButtonBase
- 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 RadioButton控件示例
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RadioButton控件的使用情况 -
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[
[Bindable]
private var selectedOption:String = "";
protected function option_clickHandler(event:MouseEvent):void {
var radioButton:RadioButton = event.target as RadioButton;
switch (radioButton.id) {
case option1.id:
selectedOption = option1.label;
break;
case option2.id:
selectedOption = option2.label;
break;
case option3.id:
selectedOption = option3.label;
break;
case option4.id:
selectedOption = option4.label;
break;
}
}
]]>
</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 = "radioButtonPanel" title = "Using RadioButton"
width = "420" height = "200" >
<s:layout>
<s:VerticalLayout gap = "10" verticalAlign = "middle"
horizontalAlign = "center" />
</s:layout>
<s:RadioButton groupName = "options" id = "option1"
label = "item #1" width="150"
click = "option_clickHandler(event)" />
<s:RadioButton groupName = "options" id = "option2"
label = "item #2" width="150"
click = "option_clickHandler(event)" />
<s:RadioButton groupName = "options" id = "option3"
label = "item #3" width="150"
click = "option_clickHandler(event)" />
<s:RadioButton groupName = "options" id = "option4"
label = "item #4" width = "150"
click = "option_clickHandler(event)" />
<s:Label id = "selectedOptionLabel" fontWeight = "bold"
text = "Item selected: {selectedOption}" width = "150" />
</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 。