Flex 2 DataGrid 分页

Flex 2 DataGrid 分页代码，效果如下：

 
     public var pageRecordes:uint = 8;
   public var totalPages:uint = 0;
   public var totalRows:uint = 0;
   public var currentPage:uint = 1;
   public var pageStartRow:uint = 1;
   public var pageEndRow:uint = 0;
  
   public function initApp():void{
     txt.text = "Page " + currentPage;
     totalRows = initDG.length;
     if(initDG.length > pageRecordes){
      dg.dataProvider = initDG.slice(0,pageRecordes);
      pPage.enabled = false;
     }
    
     if((totalRows % pageRecordes) == 0){
       totalPages = Math.floor(totalRows / pageRecordes);
     }else{
      totalPages = Math.floor(totalRows / pageRecordes + 1);
     }
    
     if(totalRows <= pageRecordes){
      this.pageStartRow = 1;
      this.pageEndRow = totalRows;
      } else {
      this.pageStartRow = 1;
      this.pageEndRow = pageRecordes;
     }
    
     if(totalPages == 1){
      pPage.enabled = false;
      nPage.enabled = false;
     }   
   }
  
   public function showPreviousPage():void{
     currentPage = currentPage - 1;
     txt.text = "Page " + currentPage;
     if(currentPage == 1){
      pPage.enabled = false;
      nPage.enabled = true;
     }else{
      pPage.enabled = true;
      nPage.enabled = true;
     }
     if (currentPage == totalPages) {
      pageStartRow = (currentPage - 1) * pageRecordes + 1;
      pageEndRow = totalRows;
     } else {
      pageStartRow = (currentPage - 1) * pageRecordes + 1;
      pageEndRow = currentPage * pageRecordes;
     }
     dg.dataProvider = initDG.slice(pageStartRow - 1,pageEndRow);
   }
  
   public function showNextPage():void{
     currentPage = currentPage + 1;
     txt.text = "Page " + currentPage;
     if(currentPage == totalPages){
      nPage.enabled = false;
      pPage.enabled = true;
     }else{
      nPage.enabled = true;
      pPage.enabled = true;
     }
     if (currentPage == totalPages) {
      pageStartRow = (currentPage - 1) * pageRecordes + 1;
      pageEndRow = totalRows;
     } else {
      pageStartRow = (currentPage - 1) * pageRecordes + 1;
      pageEndRow = currentPage * pageRecordes;
     }
     dg.dataProvider = initDG.slice((currentPage - 1) * pageRecordes,pageEndRow);
   }
  
   public function showFirstPage():void{
     dg.dataProvider = initDG.slice(0,pageRecordes);
     pPage.enabled = false;
     nPage.enabled = true;
     txt.text = "Page " + 1;
     currentPage = 1;
   }
  
   public function showLastPage():void{
     dg.dataProvider = initDG.slice((totalPages - 1) * pageRecordes,totalRows);
     pPage.enabled = true;
     nPage.enabled = false;
     txt.text = "Page " + totalPages;
     currentPage = totalPages;
   }
  ]]>
 
 
 
   
                   
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                       
                   
            
 
 
 
  
  
   
             
                  firstPage
             
         
  
  
   
             
                  prePage
             
         
  
  
  
   
             
                  nextPage
             
         
  
  
   
             
                  lastPage