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FLEX AND AIR: TAKING APPLICATIONS TO THE DESKTOP
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Figure 4-10. The Open Image Directory dialog This is the best way to bring in masses of images quickly. Once you have the image list set up, you can get a full-sized version of the image by double-clicking it as shown. That s fairly cool, but what you really want, especially for photos, is to view the image in a full-screen lightbox. This means that the image comes up in the center of the screen, full size, and that all of the content around the rest of the area is dimmed. You can accomplish this effect by playing around a little with the photo.mxml window component. The new code for the photo.mxml component is shown in the following:
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< xml version="1.0" encoding="utf-8" > <mx:Window xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" title="" transparent="true" creationComplete="onStartup()" horizontalAlign="center" verticalCenter="middle" systemChrome="none" backgroundColor="#000000" backgroundAlpha="0.9" click="onClose()"> <mx:Script> <![CDATA[ import flash.display.StageDisplayState; private function onClose() : void { stage.nativeWindow.close(); } private function onStartup() : void { stage.displayState = StageDisplayState.FULL_SCREEN_INTERACTIVE; x = -10; y = -30;
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width = stage.fullScreenWidth + 20; height = stage.fullScreenHeight + 60; } private function onLoaded() : void { theImg.setStyle('top', ( stage.fullScreenHeight / 2 ) ( theImg.content.height / 2 ) ); theImg.setStyle('left', ( stage.fullScreenWidth / 2 ) ( theImg.content.width / 2 ) ); }
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]]> </mx:Script> <mx:Image id="theImg" source="{data.url}" httpStatus="onLoaded()" /> </mx:Window>
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This new version of the code sets the background color of the window to black, and then sets a strong alpha of 0.9. It also sets the transparent attribute to true, and the system chrome to none, which is required to support the transparent attribute. The onLoaded for the image now centers the image within the window. A new startup handler sets the size of the window to the full screen with a little extra and also sets the displayState of the stage to full screen as well. Now when you double-click the image, you see something like Figure 4-11.
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Figure 4-11. The full-screen lightbox effect The entire screen is turned black with the exception of the image, which is centered in the middle of the frame. To get out of the display, you click anywhere on the screen or press the Esc key.
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FLEX AND AIR: TAKING APPLICATIONS TO THE DESKTOP
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So far you showed you some of the basics of AIR integration with the native operating system. You created menus elements, you experimented with building a browser, loading PDFs, and building a photo browser. In the next example, you will be connecting to a local SQLite database.
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SQLite Database
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One of the most significant features of AIR is the ability to work with a SQLite database. Having a local database allows creating offline capabilities for applications that are rich with data as well as opening the door for storing large amounts of data locally. Creating a complex application using SQLite can be challenging, because an application may use many SQL commands and multiple tables and SQLite doesn t support all these features.
Different classes in your application may need to use the SQLite database. You may want to keep the database connection open and avoid duplicating of code.
You have created a manager class that wraps many of the SQLite classes such as SQLConnection and SQLStatement. The manager also simplifies the complex process. The API is called SQLiteManager, and it allows you to set the database settings and then access the manager from anywhere in your application. It makes the process simpler and integrates very well with micro architecture frameworks. The SQLiteManager supports the following features:
Password encryption Multiple tables Common SQL commands Transactions and rollback option Better handling of results Improved and optimized code Save points
The API can be downloaded from here:
http://github.com/EladElrom/eladlib/tree/master/EladLibAIR/src/com/elad/framework/ sqlite/
The implementation example is here:
http://github.com/EladElrom/eladlib/tree/master/EladLibAIR/src/SqliteManager.mxml
Let s look at the implementation code. The application will hold two tables, one for users and one for orders. You will be able to insert and read information as well as keep track of transactions and roll back in case there are errors or for any other reasons. The first step is to set constants with the table names of all the tables you will be running. This way you can identify which request is to what database. The creationCompleteHandler method will be called once the application has completed initialization. You then set the database information and start the connection. Notice that you need to set the array Vector with all of the tables you will have in your application. It works this way in case the application doesn t have the tables created already. They will be generated automatically for the user so you need to specify the SQL command to create these tables and the name of each table. The names can be anything. Just be sure to use unique names.
// start database protected function creationCompleteHandler():void { var password:String = null; // leave as null to have the database unsecure or set a password for secure connection. Example: "Pa55word"; var sqliteTables:Vector.<SqliteTableVO> = new Vector.<SqliteTableVO>; sqliteTables[0] = new SqliteTableVO( "Users", "CREATE TABLE Users (UserId INTEGER PRIMARY KEY, UserName VARCHAR(150)); " ); sqliteTables[1] = new SqliteTableVO( "Orders", "CREATE TABLE Orders (OrderId INTEGER PRIMARY KEY, UserId VARCHAR(150), OrderTotal DOUBLE);" ); addListeners(); this.ordersDataGrid.dataProvider = new Array(); database.start( "Users.sql3", sqliteTables, password, sqliteTables[0].tableName ); }
You need to call addListeners to set the listeners you will be using. Take a look at this method to see the events you will be listening to.
// Set all the listeners private function addListeners():void { database.addEventListener(DatabaseSuccessEvent.DATABASE_CONNECTED _SUCCESSFULLY, function(event:DatabaseSuccessEvent):void { event.currentTarget.removeEventListener(event.type, arguments.callee); database.executeSelectAllCommand( database.sqliteTables[0] .tableName, READ_ALL_USERS_INFO ); }); database.addEventListener(DatabaseSuccessEvent.COMMAND_EXEC_SUCCESSFULLY, onSelectResult); database.addEventListener(DatabaseSuccessEvent.DATABASE_READY, function(event:DatabaseSuccessEvent):void { event.currentTarget.removeEventListener(event.type, arguments.callee); trace("database ready!"); } ); database.addEventListener(DatabaseFailEvent.COMMAND_EXEC_FAILED, function(event:DatabaseFailEvent):void { trace("SQL execution fail: "+event.errorMessage); }); database.addEventListener(DatabaseFailEvent.DATABASE_FAIL, function(event:DatabaseFailEvent):void { var message:String = "Database fail: "+event.errorMessage; if (event.isRolledBack) { message += "\nTransaction was rolled back"; } Alert.show(message); }); database.addEventListener(DatabaseSuccessEvent.CREATING_DATABASE, function(event:DatabaseSuccessEvent):void { event.currentTarget.removeEventListener(event.type, arguments.callee); trace(event.message); });
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