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AIR 2.0 ENHANCEMENTS OVERVIEW
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Once the user clicks the button, the application calls the executeNativeProcess method. That points to the location of the TextEdit native application. Note that to create an application that supports all operating systems, you need to run a test to find out the type of OS the user is using and adjust the app to reflect that. Set the NativeProcessStartupInfo properties, such as the file to open, using the args property and working directory.
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public function executeNativeProcess():void { var executable:File = new File("/Applications/TextEdit.app/Contents/MacOS/TextEdit"); var workingDirectory:File = new File("/"); var nativeProcess:NativeProcess = new NativeProcess(); if (NativeProcess.isSupported) { trace("Native Process Supported"); } var nativeProcessStartupInfo:NativeProcessStartupInfo = new NativeProcessStartupInfo(); nativeProcessStartupInfo.executable = executable; nativeProcessStartupInfo.workingDirectory = workingDirectory; var args:Vector.<String> = new Vector.<String>(); args.push("/Users/Elad/Desktop/foobar.txt"); // open file that was given with the executable application nativeProcessStartupInfo.arguments = args;
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Next, set the event listener so you can track errors, dispatch the onExitError event, and start the process. Notice that you have placed the code block in try and catch tags to ensure it s working correctly.
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nativeProcess.addEventListener( NativeProcessExitEvent.EXIT, onExitError ); try { nativeProcess.start(nativeProcessStartupInfo); } catch (error:IllegalOperationError) { trace("Illegal Operation: "+error.toString()); } catch (error:ArgumentError) { trace("Argument Error: "+error.toString()); } catch (error:Error) { trace ("Error: "+error.toString()); } if (nativeProcess.running) { trace ("Native Process Support"); } } public function onExitError(event:NativeProcessExitEvent):void {
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trace( "Native Process Exit code: "+event.exitCode ); }
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AIR 2.0 allows support for building Flash-based applications that work with screen readers. The functionality is available only on Windows OS at this release. The following support has been added.
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Runtime dialog boxes: Dialog boxes are readable by supported screen readers. Flex components and containers: Flex components and containers are readable by screen readers.
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Note that the Generate accessible SWF file option in Flex Builder must be turned on in order to enable support for accessibility. 1. 2. 3. Right-click your Flex project (in the Flex Navigator) and select Properties. Select Flex Compiler. Select the Generate accessible SWF check box, and then click the OK button (see Figure 5-4).
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Figure 5-4. Flex Compiler properties showing the Generate accessible SWF File option
File Promise API
File promise is a new API (URLFilePromise) that allows you to access resources at a certain URL and drag them out of the AIR application as a file promise into the local machine. File promise, as the name
AIR 2.0 ENHANCEMENTS OVERVIEW
suggests, is a commitment that the file exists without actually checking. Once the files are dropped, the request will be made to download the file to your local machine. The URLFilePromise class implements the contract of IFilePromise using URLStream and URLRequest objects as the data source. To create a URL file promise, you create a URLFilePromise object, add the object to an array, and then start the drag, passing the Clipboard object the array of file promises.
var items:Array = fileData.selectedItems; var promises:Array = new Array(); for each (var item:Object in items) { var filePromise:URLFilePromise = new URLFilePromise(); var request:URLRequest = new URLRequest(item.url); filePromise.request = request; filePromise.relativePath = item.name; promises.push(filePromise); } clipboard.setData(ClipboardFormats.FILE_PROMISE_LIST_FORMAT, promises); NativeDragManager.doDrag(fileData, clipboard);
When the user completes the drag task and drops the file on the local machine, the runtime downloads the data for each file promise. See Figure 5-5. Take a look at the following application, which allows the dragging of items from a list into the user s local machine and then the copying of the files.
< 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"> <fx:Script> <![CDATA[ import air.desktop.URLFilePromise; import flash.desktop.Clipboard; import flash.desktop.ClipboardFormats; import flash.desktop.NativeDragManager; private var clipboard:Clipboard = new Clipboard(); protected function onDragOut(event:MouseEvent):void { var items:Array = fileData.selectedItems; var promises:Array = new Array(); for each (var item:Object in items) { var filePromise:URLFilePromise = new URLFilePromise(); var request:URLRequest = new URLRequest(item.url);
filePromise.request = request; filePromise.relativePath = item.name; promises.push(filePromise); } clipboard.setData(ClipboardFormats.FILE_PROMISE_LIST_FORMAT, promises); NativeDragManager.doDrag(fileData, clipboard); } private function onDragOutComplete(event:NativeDragEvent):void { trace( "onDragOutComplete" ); } ]]> </fx:Script> <fx:Declarations> <mx:ArrayCollection id="arrColl"> <mx:source> <fx:Array> <fx:Object name="rhall.jpg" url="http://a1.twimg.com/ profile_images/57117466/robert_m_hall_bio_photo_big_normal.jpg" /> <fx:Object name="bobjim.jpg" url="http://a1.twimg.com/ profile_images/51723308/ryancampbell3_normal.jpg"/> <fx:Object name="jenschr.jpg" url="http://a1.twimg.com/ profile_images/43222252/jenschr_mugshot3_normal.jpg"/> <fx:Object name="adamflater.jpg" url="http://a1.twimg.com/ profile_images/21503622/Photo_8_normal.jpg"/> <fx:Object name="reboog711.jpg" url="http://a1.twimg.com/ profile_images/16984682/DSCF0044_normal.jpg"/> </fx:Array> </mx:source> </mx:ArrayCollection> </fx:Declarations> <mx:DataGrid id="fileData" dragEnabled="true" dataProvider="{arrColl}" mouseMove="onDragOut(event)" nativeDragComplete="onDragOutComplete(event)"> <mx:columns> <mx:DataGridColumn dataField="name" /> <mx:DataGridColumn dataField="url"/> </mx:columns> </mx:DataGrid> </s:WindowedApplication>
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