MACROMEDIA FLEX-GETTING STARTED WITH FLEX Manuale Utente Scaricare il pdf (Pagina 53)

CHAPTER 4

Flex Controls and Layout

The first step in building a Flex application is to create the user

interface.

Flex not only has a rich set of controls. It also has a

complete set of layout mechanisms that make it easy to build

user interfaces that look good and can scale appropriately as

the display area of the Flash application is resized.

This chapter covers both layout mechanisms and controls. We

will start by covering the layout mechanisms, and then we will

discuss the available controls.

The Application Container

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

Application container, which holds all other containers and

components. The Application container lays out all its children

vertically by default (when the layout property is not specifi-

cally defined). There are three possible values for the Applica

tion component’s layout property:

vertical

Lays out each child component vertically from the top of

the application to the bottom in the specified order

horizontal

Lays out each child component horizontally from the left

of the application to the right in the specified order

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MACROMEDIA FLEX-GETTING STARTED WITH FLEX Manuale Utente Pagina 53