Flex4自定义分页组件

最近因为项目需求，需要写个分页组件，我这人比较懒 一般写出来之后 就记下来供以后粘贴复制了 哈哈，希望大家学习的时候不要这样搞啊

下面贴出代码

PagingBar.mxml

<?xml version="1.0" encoding="utf-8"?>
<mx:HBox xmlns:fx="http://ns.adobe.com/mxml/2009" 
		 xmlns:s="library://ns.adobe.com/flex/spark" 
		 xmlns:mx="library://ns.adobe.com/flex/mx" >
	<fx:Script>
		<![CDATA[
			import mx.collections.ArrayCollection;
			import mx.events.ItemClickEvent;
			import flash.events.KeyboardEvent;
			import mx.controls.DataGrid;
			import mx.validators.NumberValidator;
			import mx.rpc.events.ResultEvent; 
			import mx.rpc.events.FaultEvent;
			import mx.controls.Alert;
			[Bindable]
			[Embed(source='com/iman/sps/sheet/image/first.jpg')]
			public var firstIcon:Class;				  
			public var firstPage:uint; 
			
			[Bindable]
			[Embed(source='com/iman/sps/sheet/image/pre.jpg')]
			public var preIcon:Class;
			public var prePage:uint; 
			
			[Bindable]
			[Embed(source='com/iman/sps/sheet/image/next.jpg')]
			public var nextIcon:Class;
			public var nextPage:uint; 
			
			[Bindable]
			[Embed(source='com/iman/sps/sheet/image/last.jpg')]
			public var lastIcon:Class;
			public var lastPage:uint;
			
			[Bindable]public var pageSize:int=15;//单页行数
			[Bindable]public var totalPage:int=1;//总页数
			[Bindable]public var currentPage:int=1;//当前页
			[Bindable]public var totalClum:int=0;//总记录数
			
			//分页函数
			public var localFunction:Function=null;
			
			//重新为当前页的变量赋值
			public function loadData(pageNum:int):void{
				this.pageSize = setPageSize.selectedItem.data as Number; 
				this.totalPage =Math.ceil(this.totalClum/this.pageSize);
				if(pageNum>0 && pageNum<=this.totalPage){
					this.currentPage=pageNum;
					if(this.localFunction!=null){
						
						localFunction(pageNum);
					}else{
						Alert.show("请设置回调方法！");
					}
				}
			}
			
			//重新设置每页显示记录数
			public function changePagesize():void{
				//当前页首条记录的序号
				var currentPageRows:int=((this.currentPage-1)*this.pageSize);
				//Alert.show(String(currentPageRows));
				//重新设置以后，单页显示记录数
				this.pageSize = setPageSize.selectedItem.data as Number; 
				//重新设置以后，总页数
				this.totalPage =Math.ceil(this.totalClum/this.pageSize);
				//重新调整当前页码			
				//Alert.show(String(newPageNum));
				if(this.localFunction!=null){
					localFunction(this.currentPage);
				}else{
					Alert.show("请设置回调方法！");
				}
			}
		]]>
	</fx:Script>
	<mx:Text id="temp" text="" visible="false" includeInLayout="false"/>
	<mx:HBox 
		verticalGap="0"  
		horizontalGap="0" 
		horizontalAlign="center"
		verticalAlign="middle"
		> 
		<mx:Text text="{'   共'+(totalClum)+'条记录'}" fontSize="12"/>                
		<mx:Label   text="每页显示："/>
		<mx:ComboBox id="setPageSize" width="52" height="16" change="changePagesize()">
			<mx:dataProvider>
				<fx:Array>     
					<fx:Object label="15" data="15" />                                                                                                         
					<fx:Object label="20" data="20" />
					<fx:Object label="30" data="30" /> 
					<fx:Object label="40" data="40" />                                                                                                         
					<fx:Object label="50" data="50" />
					<fx:Object label="60" data="60" /> 	
					<fx:Object label="70" data="70" />                                                                                                         
					<fx:Object label="80" data="80" />								   
				</fx:Array>
			</mx:dataProvider>
		</mx:ComboBox>
		<mx:Label text="条"/>
		
		<mx:Button id="firstNavBtn" icon="{firstIcon}" width="10" height="10" click="loadData(1)" enabled="{lbtnPrevious.enabled}"/>
		<mx:LinkButton id="lbtnFirst" label="首页" click="loadData(1)" enabled="{lbtnPrevious.enabled}" fontSize="12"/>
		
		<mx:Button id="preNavBtn" icon="{preIcon}" width="7" height="10" click="loadData(currentPage-1)" enabled="{currentPage!=1?true:false}"/>
		<mx:LinkButton id="lbtnPrevious" label="上一页" click="loadData(currentPage-1)" enabled="{currentPage!=1?true:false}" fontSize="12"/>
		
		<mx:Text text="{'【 '+(Math.ceil(this.totalClum/this.pageSize)>0?(currentPage):1)+'/'+(Math.ceil(this.totalClum/this.pageSize)>0?Math.ceil(this.totalClum/this.pageSize):1)+'页】  '}" fontSize="12"/>
		
		<mx:Button id="nextNavBtn" icon="{nextIcon}" width="7" height="10" click="loadData(currentPage+1)" enabled="{Math.ceil(this.totalClum/this.pageSize)>(currentPage)?true:false}"/>
		<mx:LinkButton id="lbtnNext" label="下一页" click="loadData(currentPage+1)" enabled="{Math.ceil(this.totalClum/this.pageSize)>(currentPage)?true:false}" fontSize="12"/>
		
		<mx:Button id="lastNavBtn" icon="{lastIcon}" width="10" height="10" click="loadData(Math.ceil(this.totalClum/this.pageSize))" enabled="{lbtnNext.enabled}"/>
		<mx:LinkButton id="lbtnLast" label="尾页" click="loadData(Math.ceil(this.totalClum/this.pageSize))" enabled="{lbtnNext.enabled}" fontSize="12"/>
		
		<mx:Label text="跳转到"/>
		<mx:NumericStepper id="nsPageNum" width="50" height="22" stepSize="1" minimum="1" maximum="{Math.ceil(this.totalClum/this.pageSize)}" enabled="{lbtnJump.enabled}" cornerRadius="0" fontSize="12"/>
		<mx:Label text="页"/>
		<mx:LinkButton id="lbtnJump" label="GO"  click="loadData(nsPageNum.value)" enabled="{Math.ceil(this.totalClum/this.pageSize)>1?true:false}" fontSize="12"/>              
		
	</mx:HBox>
</mx:HBox>

在其他组件中引用 其中common 是我自定义的标签 里面引入了这个分页组件的所在位置?例如： xmlns:common="com.iman.common.*"

?

<common:PagingBar width="100%" height="5%" id="pageBar">
		</common:PagingBar>

?

写完之后说说怎么用。里面每次改变分页某个属性 就会触发一个叫做localFunction的函数 这个函数是对外暴漏给引用页面来实现他的功能的

下面是一个示例代码：作用是 首先设置初始页 然后获得 每页显示的数据记录条数 然后 实现分页组件暴露出来的分页功能函数

	protected function test_clickHandler(event:MouseEvent):void
			{	firstStart=0;
				pagesize=pageBar.pageSize;
				pageBar.localFunction=fun;

                           }

下面我们来实现这个函数 也就是fun 这个fun获得当前页数? 因为后台调用了Oracle实现的分页查询 所以我要算出数据从第几条开始 到第几条结束 然后就是调用查询方法了

	public function fun(pageNo:int):void
			{
				this.firstStart=(pageNo - 1) * pageBar.pageSize;
				pagesize=pageBar.pageSize;
				commonQuery.commonQuery(firstStart,pagesize,commonQueryData,accountInfo);
			}