Programming Flex 3: The Comprehensive Guide to Creating Rich Internet Applications with Adobe Flex

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This browser plug-in first got serious attention as Macromedia Flash 1. Macromedia merged with Adobe in late so the full name of the current plug-in is Adobe Flash Player 9.

SWF files contain graphic, layout and logic information, but applications can also load data and programs from networks or local file systems. Spectacular effects are achieved with little effort by the programmer. Being restricted to the browser plug-in environment limits the possible applications for a rich Internet application RIA.

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Recognizing this, Adobe is working on a stand alone desktop application environment called the Adobe Integrated Runtime or AIR, previously code-named Apollo. MXML file type. Control over component layout uses concepts such as "grid" layouts that will be familiar to Java programmers. Reasonable defaults are defined that let you get started with something that works and refine the layout later. In contrast with the Flex 1. Naturally, Adobe would love to sell you the Flex Builder IDE, but you can experiment freely and show off your Flash creations without spending any money.

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This is a commercial use friendly license reflecting Adobe's desire to create vibrant Flex developer community. The first open-source release will be named Flex 3, currently in beta testing and anticipating release in the fall. Handling user events, logic and data in Flash Player is accomplished with ActionScript , a scripting style language based on the ECMA international standard which is also the base for JavaScript. Although nominally a "scripting" language, ActionScript packaged into a Flash application is compiled into a bytecode which is executed by a virtual machine, just like Java and.

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ActionScript functions can communicate with JavaScript programs hosted in the same Web page. The latest version, ActionScript 3. ActionScript 3.

ActionScript 3 uses compilation to a new bytecode scheme, which is incompatible with all previous versions, so the current Flash Player plug-in actually contains 2 virtual machines to work with previous scripts as well as the latest. For higher performance, ActionScript 3 uses "just in time" JIT compilation of bytecodes to cpu-specific machine codes. Now lets look at a simple Flex script for a Flash application.

A script must be a complete XML document with a mx:Application tag as the root element. In this example, all of the interface components are contained inside a plain "mx:Panel" tag. Note that the mx:Button tag specifies a "click" attribute that has the value "news. The mx:HTTPService tag sets up the code to send a request to the specified URL and defines how the returned data is to be treated, in this case as plain text.

The process of actually sending a request and getting a result only occurs when the implied send method is invoked by a mouse click on the mx:Button. This process terminates with either a call to the normal result handling method or the fault handling method. Flex provides other types of remote service access, I chose this example because it is the simplest to explain.

You can also import external ActionScript files.

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Flex applications may be precompiled as SWF files and served to Flash Player directly or dynamically compiled and assembled by specialized servers. As with so many other browser incompatibilities, there are differences between Microsoft IE and browsers such as Netscape. Browser security settings may interfere with the operation of JavaScript and ActionScript.

As discussed in my previous article , Sun's JavaFX scripting language is intended to bring the highly flexible and customizable "Swing" component library into the RIA arena. JavaFX has a much larger library of Java functions to draw on when necessary, but Flex excels at spectacular user interface effects. In April of this year, Microsoft introduced a browser plug-in, "Silverlight" clearly intended to compete with the Flash Player.

Programming Flex 3 - Chafic Kazoun, Joey Lott - Google книги

Silverlight player 1. Since Microsoft can ensure that new computers have Silverlight installed and updated automatically it will eventually become widely distributed.

The starting point for downloading the Flex 2 SDK. Track the progress of the open-source Flex 3 beta release and related Adobe projects. An interesting part of Adobe's pitch for Flex as a development and deployment platform is that as good as AJAX applications and development libraries can be they rely on either the JavaScript implementation the browser implements or the platform on which the browser runs.

As this implementation may have standards compliance problems along with bugs and performance issues it makes reliable implementation and deployment of AJAX applications impossible to guarantee. Adobe argues that as the Flash Player is implemented consistently over all platforms and complies with the ECMA standards, this ensures greater application stability and fewer bugs. Moreover because ECMAScript is really JavaScript under an alias, there are hundreds of thousands of programmers who can readily cut code for rendering by the Flash Player.

In fact Adobe's goal is to reach 1 million developers using Flex in the next few years. The Flex Framework 2 is free and the Flex Enterprise Services 2 is free up to five client seats and running on a single unclustered server. Flex Builder 2. The full release is planned for the first half of calendar year To explore the beta, go to Adobe Labs.


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