<?xml version="1.0" encoding="utf-8"?>
<mx:Application 
viewSourceURL="@mx-mashup-rmx-07-Chapter7-Exercise1-Chapter7-Exercise1.html" 
	xmlns:mx="http://www.adobe.com/2006/mxml" 
	layout="absolute" 
	initialize="init()">
	
	<mx:Script>
		<![CDATA[
			import mx.controls.Alert;
			import mx.collections.ArrayCollection;
			import mx.utils.*;
			import mx.managers.*;
			import com.almerblank.utils.ServiceUtility;
			
			private var amfphp:ServiceUtility = ServiceUtility.getInstance();
			private const GATEWAY:String = 'http://amfphp:8888/gateway.php';
			private const POLICY:String = 'http://amfphp:8888/crossdomain.xml';
			
			[Bindable] private var productsDP:ArrayCollection;
			[Bindable] private var offset:uint = 0;
			[Bindable] private var pageSize:uint;
			[Bindable] private var totalProducts:uint;
			
			[Bindable] private var previousVisible:Boolean = false;
			[Bindable] private var nextVisible:Boolean = true;
			
			private function init():void{
				amfphp.init(GATEWAY, false, null);
				getProducts(0);
			}
			
			private function getProducts(startID:uint):void{
				amfphp.call('com.almerblank.ISBN8962.Ch7.Products.browse', resultHandler, faultHandler, startID);
				CursorManager.setBusyCursor();
			}
			
			private function resultHandler(result:Array):void{
				try {
					productsDP = new ArrayCollection(result);
					pageSize = productsDP.getItemAt(5).pageSize;
					offset = productsDP.getItemAt(5).offset;
					totalProducts = productsDP.getItemAt(5).totalProducts;
					setButtonVisibility();
					trace('offset = '+offset+'\npageSize = '+pageSize+'\ntotalProducts = '+totalProducts);
				} catch(error:*) {
					trace('get products error: '+error.message);
				} finally {
					CursorManager.removeBusyCursor();
				}
			}
			
			private function faultHandler(fault:Object):void{
				Alert.show(fault.description, 'Service Error:');
			}
			
			private function setButtonVisibility():void{
				previousVisible = (offset > 0) ? true : false;
				nextVisible = (totalProducts > offset + pageSize) ? true : false;
			}
		]]>
	</mx:Script>
	
	<mx:DataGrid 
		x="141" 
		y="70" 
		id="dgProducts" 
		dataProvider="{productsDP}" 
		width="900">
		<mx:columns>
			<mx:DataGridColumn 
				headerText="Prod. ID" 
				dataField="product_id" 
				width="60"/>
			<mx:DataGridColumn 
				headerText="Product" 
				dataField="product_name"/>
			<mx:DataGridColumn 
				headerText="Description" 
				dataField="product_desc"/>
			<mx:DataGridColumn 
				headerText="Price" 
				dataField="product_price" width="80"/>
		</mx:columns>
	</mx:DataGrid>
	<mx:Button 
		x="141" 
		y="244" 
		id="previousPage" 
		label="Previous" 
		visible="{previousVisible}" 
		click="getProducts(offset-pageSize)"/>
	<mx:Button 
		x="{dgProducts.width-2}" 
		y="244" 
		id="nextPage" 
		label="Next" 
		visible="{nextVisible}" 
		click="getProducts(offset+pageSize)"/>
	
</mx:Application>