Part IV in .NET

Deploy Quick Response Code in .NET Part IV
Part IV
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Building an Application
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sections of code are becoming chaotic, and your end goal is a working system made up of much neater pieces of ravioli. With that in mind, the theory behind refactoring suggests that it is best to go through this process gradually, cleaning up sections or layers of code one at a time, so that the system s functionality is kept intact throughout. The sooner you address a problem of course, the easier it is to refactor. If a confusing section of code is left in place, it will start to affect sections of code that need to interface with it, because those interfaces will also be confusing. Over time, as all these sections continue to be modified, the infection spreads. Eventually, it will require less work to start over than it will to refactor the entire system, and this is the true threshold between ravioli and spaghetti. For Web applications, this threshold has been only a mild threat in the past. The reason it hasn t been a serious threat is that Web technology has been growing and maturing at an incredible rate. Once the threshold is reached and a project becomes unwieldy to maintain, it is often easy to justify a clean start because the technology has changed. Most Web applications are relatively small, which also shields Web developers from entropy. As you begin developing larger applications in AIR, you should not rely on those factors. The technology will certainly expand and mature, but you should try to build applications that can grow with the technology. If you allow your code to cross the threshold from ravioli to spaghetti, then your application becomes disposable. To build a durable application, the practice should be clear. First, slow down and try to lighten the load of external pressures that would prevent you from refactoring when necessary. Second, keep your code like ravioli to prevent tight coupling and confusion between developers. Finally, always document systems clearly, because confusion is both the cause and the effect of spaghetti.
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Flex and Flash Guidelines
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Flex and Flash applications are both coded primarily using ActionScript and are designed to run in the AIR environment or the Flash Player in the browser. The difference between them is really that Flex is an extension of Flash a Flex application is a Flash movie with two frames, one for the preloader and one for the Flex framework and the application. From a development perspective, Flash applications are typically built using the Flash IDE, while Flex applications are built using Flex Builder or a text editor with the Flex SDK and the Flex command-line compiler. Flash applications often take advantage of the timeline, which provides a detailed design-time preview of objects on the stage or the way that objects move around the stage.
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Application Design Best Practices
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Flex applications, on the other hand, typically use MXML documents to lay out the stage of view classes instead of a Flash MovieClip. A MovieClip can still be instantiated from Flex, and if the timeline is needed, it is still possible to embed a Flash SWF and control any MovieClip from its library. One major factor to consider when choosing between Flex and Flash is load time. The Flex framework itself is about 200K to download; this cost often outweighs the benefits of the framework on Web projects where load time is a critical factor and the coding demands are mild. Load time is a valid concern for many Web applications but is less important for a desktop application, given that the user only needs to download the application once. There is a misconception that Flex is geared toward form-based content, while Flash is better suited for heavily animated content. While it is true the Flex Builder does not have native drawing tools, as Flash does, keep in mind that Flex is able to embed and manipulate Flash library objects with ease. Also, Flex does provide substantial support for forms and form elements, but it also enables a wide variety of animations to transition from one application state to the next. Essentially, Flex is geared toward application development, and while both Flex and Flash have the same capabilities, the Flex framework provides a significant head start into any application development cycle. One of the most important choices you will make for a project is choosing what technology to use. For AIR applications, Flex is probably a more logical choice than Flash. There will always be exceptions to this, of course. For example, an AIR application built from a previously existing Flash application should probably be built in Flash. Also, the developer s skill set must be taken into account, as learning Flex does take time. One key difference between Flex and Flash is that Flex applications are built in both ActionScript and MXML. MXML is a declarative language that allows developers to construct complex classes with a minimal amount of code. Additionally, you can use the Flex Design Mode to preview visual components, which provides a stage of sorts to aid you in visualization at design time. For example, suppose you need to create a list of button components. If you were to build this in MXML, the code might look like Listing 16.1.
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