使用 IViewCursor 来解析嵌套的 ArrayCollection

最新推荐文章于 2021-02-13 06:59:51 发布

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本文介绍了一个基于Adobe Flex的应用程序中，如何使用游标遍历汽车经销商的库存，并根据销售记录更新库存状态的具体实现方法。

原文：http://kb2.adobe.com/community/publishing/526/cpsid_52633.html

carDealers结构图如下：

var carDealers:ArrayCollection;
var dealerCursor:IViewCursor;
var vehicleCursor:IViewCursor;

var affectedDealer:CarDealer;
var targetVehicle:Car;
var targetVehicleIndex:Number;

var dealerIdFromSale:String = 'XXXXXXXX-XXXX-XXXX-XXXXXXXXXXX';
var vinNumberFromSale:String = 'XXXXXXXXXXXXXXXXX';

dealerCursor = carDealers.createCursor();

// iterate through the list of dealers
while (!dealerCursor.afterLast)
{
  if (dealerCursor.current.dealerId == dealerIdFromSale)
  {
     affectedDealer = CarDealer( dealerCursor.current );

     // create a cursor to iterate over the dealer's inventory
     vehicleCursor = affectedDealer.inventory.createCursor();

     // iterate over the inventory
     while (!vehicleCursor.afterLast)
     {
        if (vehicleCursor.current.VIN == vinNumberFromSale)
        {
           // a match was found so now we need the 
           // index of this vehicle in the ArrayCollection
           targetVehicle = Car( vehicleCursor.current );
           targetVehicleIndex = affectedDealer.inventory.getItemIndex( targetVehicle );

           // since the sale was successful, we can safely 
           // remove the vehicle from this dealer's inventory
           affectedDealer.inventory.removeItemAt( targetVehicleIndex );
        }

        vehicleCursor.moveNext();
     }
  }

  dealerCursor.moveNext();
}

主要代码如下：

dealerCursor = carDealers.createCursor();

// iterate through the list of dealers
while (!dealerCursor.afterLast)
{
    // dealerCursor.current.dealerId 获取游标当前值
    dealerCursor.moveNext();
}