MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Betriebsanweisung PDF herunterladen (Seite 59)

The Flex programming model 59

Relationship of the Flex class hierarchy to MXML and

ActionScript

Flex is implemented as an ActionScript class library. That class library contains components

(containers and controls), manager classes, data-service classes, and classes for all other

features. You develop applications using the MXML and ActionScript languages with the class

library.

MXML tags correspond to ActionScript classes or properties of classes. Flex parses MXML

tags and compiles a SWF file that contains the corresponding ActionScript objects. For

example, Flex provides the ActionScript Button class that defines the Flex Button control. In

MXML, you create a Button control using the following MXML statement:

<mx:Button label="Submit"/>

When you declare a control using an MXML tag, you create an instance object of that class.

This MXML statement creates a Button object, and initializes the

label property of the

Button object to the string “Submit”.

An MXML tag that corresponds to an ActionScript class uses the same naming conventions as

the ActionScript class. Class names begin with an uppercase letter, and uppercase letters

separate the words in class names. Every MXML tag attribute corresponds to a property of the

ActionScript object, a style applied to the object, or an event listener for the object. For a

complete description of the Flex class library and MXML tag syntax, see the Adobe Flex 2

Language Reference.

Laying out your application

You declare a Flex user interface by using tags that represent user-interface components. There

are two general types of components: controls and containers. Controls are form elements,

such as buttons, text fields, and list boxes. Containers are rectangular regions of the screen

that contain controls and other containers.

At the root of a Flex application is a single container, called the Application container, that

represents the entire Flash Player drawing surface. This Application container holds all other

containers, which can represent dialog boxes, panels, and forms.

A container has predefined rules to control the layout of its child containers and controls,

including sizing and positioning. Flex defines layout rules to simplify the design and

implementation of rich Internet applications, while also providing enough flexibility to let

you create a diverse set of applications.

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MACROMEDIA COLDFUSION MX 7.0.2-USING COLDFUSION MX WITH FLEX 2 Betriebsanweisung Seite 59