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Contents
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16: Application Design Best Practices . . . . . . . . . . . . . . . . . . . . 305
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Preventing Spaghetti Code ................................................................................................306 How spaghetti has changed .....................................................................................307 Make ravioli instead ................................................................................................307 Encapsulation ................................................................................................308 Documentation..............................................................................................309 Entropy .........................................................................................................309 Flex and Flash Guidelines .................................................................................................310 Transitions ..............................................................................................................312 Combining MXML with ActionScript ......................................................................315 General Coding Guidelines ...............................................................................................317 Package structuring .................................................................................................318 Using interfaces .......................................................................................................318 Summary ..........................................................................................................................322
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17: SDK Development. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 323
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SDK Development Essentials.............................................................................................323 Application descriptor file .......................................................................................324 Source files ..............................................................................................................324 Compiling Applications ....................................................................................................324 The acompc compiler ..............................................................................................325 The acompc configuration file .................................................................................325 Component compiler usage examples .....................................................................326 Debugging ........................................................................................................................327 ADL command-line arguments................................................................................327 ADL examples .........................................................................................................328 Summary ..........................................................................................................................328
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18: Sample Application: LogReader . . . . . . . . . . . . . . . . . . . . . 329
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Requirements ....................................................................................................................329 Functionality ...........................................................................................................330 User interface ..........................................................................................................330 Architecture ......................................................................................................................330 Making the application updatable ...........................................................................331 Preparing the API ....................................................................................................338 Creating the application view and logic ...................................................................340 Testing ..............................................................................................................................352 Summary ..........................................................................................................................355
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19: Polishing a Finished Application . . . . . . . . . . . . . . . . . . . . . 357
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The Importance of Design and Usability ...........................................................................358 The relationship between function, usability, and design ........................................358 Properties of good design ........................................................................................362 Layout ...........................................................................................................362 Typography ...................................................................................................362
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Contents
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Color palettes ................................................................................................362 Transitions ....................................................................................................363 Sound............................................................................................................363 Properties of good experience .................................................................................364 Keyboard shortcuts and versatility .................................................................365 Language support ..........................................................................................365 Accessibility...................................................................................................366 Performance and reliability ............................................................................366 Flex Builder 3 Design Tutorial ..........................................................................................368 Cascading Style Sheets ............................................................................................368 Embedding assets ....................................................................................................371 Creating custom components ..................................................................................373 Programmatic skins .................................................................................................375 Using Flex states to guide transitions.......................................................................379 Summary ..........................................................................................................................382
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Part V: Testing and Deploying
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20: Deployment Workflow . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385
Deploying from the Flex Builder 3 IDE .............................................................................385 Deploying from the Flash CS3 IDE ...................................................................................388 Deploying from the Dreamweaver CS3 IDE ......................................................................390 Compiling, Testing, and Deploying with Command-line Tools .........................................392 Using MXMLC to compile an SWF file ....................................................................392 Using ADL to test an application .............................................................................393 Using ADT to generate a digital certificate ...............................................................393 Using ADT to package an AIR file ...........................................................................393 Summary ..........................................................................................................................394
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21: Leveraging Ant to Automate the Build Process . . . . . . . . . . 395
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Getting Set Up ..................................................................................................................395 Adding Ant view to the stand-alone Flex Builder IDE..............................................396 Installing Ant on your machine ...............................................................................396 Creating a Build File .........................................................................................................397 Defining properties .................................................................................................397 Defining targets .......................................................................................................399 Defining tasks .........................................................................................................401 Executing targets .....................................................................................................403 Adding Basic Targets .........................................................................................................405 Main target ..............................................................................................................405 Init target ................................................................................................................405 Compile targets .......................................................................................................406 Launch target ..........................................................................................................410 Generate certificate target ........................................................................................410
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Contents
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Deploy target...........................................................................................................411 Clean target .............................................................................................................412 Adding Advanced Targets .................................................................................................412 Generate documentation target ...............................................................................413 Export and package source target ............................................................................415 User input target .....................................................................................................416 Summary ..........................................................................................................................418
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22: Installation and Distribution . . . . . . . . . . . . . . . . . . . . . . . . 419
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Implementing an Update System ......................................................................................419 Version tracking ......................................................................................................420 Notifying the user that updates are available ...........................................................423 Downloading and installing updates .......................................................................424 Using the Adobe Install Badge...........................................................................................427 Creating a Custom Install Badge .......................................................................................428 Manual Installation ...........................................................................................................432 Summary ..........................................................................................................................432
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 433
Introduction
Adobe Integrated Runtime, or AIR, enables developers to create desktop applications using HTML, JavaScript, and ActionScript. These applications are able to run on Windows, Mac OS X, and Linux systems, meaning that Web developers will be able to use familiar languages and tools to easily create desktop software. A Web application can look the same to every user, on any computer, because the same code is being executed to create the interface. The browser application itself handles the differences between operating systems, which allows code to execute in the same way on a wide variety of machines. A desktop application, on the other hand, starts up quickly because it is run directly from the user s computer, accesses data quickly because it can store data locally, does not require an Internet connection to run, and is not constrained by the browser window. Consider the current market of e-mail applications. If you use a Web application for your e-mail, you will be able to access the interface from any computer, and possibly even some mobile devices. These applications have become very popular as a result, but there are still drawbacks to using a Web application over a desktop application. For example, if you want to find an e-mail you received last week or last month, you often need to page through old messages to find the right place in a Web application. This is a necessity because the data is stored remotely, so the amount of data passed to the browser must be constrained. In a desktop application, messages can be stored locally, and you can easily scroll down to find an older message. Clearly there are uses for both Web applications and desktop applications. With AIR, there is now a way to use the same interface in both environments. While there may need to be some differences between a Web implementation and a desktop implementation in order to take full advantage of those environments, there is a lot to be gained from not having to create an entirely new application for each environment. AIR, along with other recent developments that enable Web applications to run on the desktop, blurs the line between Web and desktop applications, and it will raise user expectations on both. One of the most powerful features of Web development languages is that they are high-level scripting languages designed for developing presentation layers. HTML isn t able to manage memory or access low-level operating system APIs; it was never intended to do such things. Instead, a browser interprets HTML, and the developers of that browser s engine focus on those things. This allows developers of the higher-level language to focus their efforts on the user experience and the business logic of an application.