The Space For App Developers

<?xml version="1.0" encoding="utf-8"?>
<s:WindowedApplication xmlns:fx="http://ns.adobe.com/mxml/2009" 
					   xmlns:s="library://ns.adobe.com/flex/spark" 
					   xmlns:mx="library://ns.adobe.com/flex/mx"
					   xmlns:halo="library://ns.adobe.com/flex/halo"
					   currentState="START_STATE" height="200" width="300" viewSourceURL="srcview/index.html">
 
	<s:layout>
		<s:VerticalLayout horizontalAlign="center" gap="15"/>
	</s:layout>
 
	<fx:Script>
		<![CDATA[
			import flash.events.Event;
			import flash.events.MouseEvent;
			import flash.system.Capabilities;
 
			protected var filePromise:URLFilePromise;
 
			protected function imgAirIcon_mouseDownHandler(event:MouseEvent):void
			{
				// Instantiating new file promise
				filePromise = new URLFilePromise();
				// Registering OPEN event listener, to switch to 
				// DOWNLOAD_STATE when downloading starts
				filePromise.addEventListener(Event.OPEN, onOpen);
 
				// Setting URLRequest pointing to remote file
				filePromise.request = new URLRequest(fileUrl);
				// Setting relativePath with fileName to be saved locally
				filePromise.relativePath = fileName;
 
				// Array of promises with single promise in this case
				var promises:Array = new Array();
				promises.push(filePromise);
 
				// Instantiating clipboard object pointing to the promise
				var clipboard:Clipboard = new Clipboard();
				clipboard.setData(ClipboardFormats.FILE_PROMISE_LIST_FORMAT, promises);
 
				// Dragging with NativeDragManager
				NativeDragManager.doDrag(imgAirIcon, clipboard);
			}
 
			protected function onOpen(event:Event):void
			{
				currentState = "DOWNLOAD_STATE";
				prgBar.source = filePromise;
			}
 
			protected function get fileUrl():String
			{
				// Returns remote file URL based on current operating system
				if (Capabilities.os.search(/mac/i) > -1)
					return "http://airdownload.adobe.com/air/mac/download/latest/AdobeAIR.dmg";
				else if (Capabilities.os.search(/win/i) > -1)
					return "http://airdownload.adobe.com/air/win/download/latest/AdobeAIRInstaller.exe";
				else 
					return "http://airdownload.adobe.com/air/lin/download/latest/AdobeAIRInstaller.bin";
			}
 
			protected function get fileName():String
			{
				var fileUrl:String = fileUrl;
				return fileUrl.slice(fileUrl.lastIndexOf("/") + 1);
			}
		]]>
	</fx:Script>
 
	<s:states>
		<s:State name="START_STATE"/>
		<s:State name="DOWNLOAD_STATE"/>
	</s:states>
 
	<halo:Image id="imgAirIcon" source="assets/air_icon_special.gif" mouseDown="imgAirIcon_mouseDownHandler(event)" toolTip="{fileUrl}" />
 
	<s:Label text="(Drag it out to start download)" />
 
	<halo:ProgressBar id="prgBar" bottom="10" horizontalCenter="0"  visible="false" visible.DOWNLOAD_STATE="true" label="Downloading {int(prgBar.percentComplete)}%"/>
 
</s:WindowedApplication>