Macromedia flex 2-migrating applications to flex 2 Manual De Usuario

34

ActionScript 2.0 to 3.0

(hintString ? String:Number)

 is the non-assignment expression. The variable 

myVar

 is 

dynamically typed to be String if 

hintString

 is 

true

, else its type will be Number. You can 

use a non-assignment expression anywhere that you would use a type-assignment expression. 

Global functions

Most global functions have changed packages. In addition, they are no longer implicitly 
imported. This section describes some changes to the global functions.

Explicit imports

In most cases, you must import the classes to use global functions. For example, to use 
functions in the System.* package, you now import flash.system.*. The global functions in 
System.* were previously accessible in your 

<mx:Script>

 blocks without explicit imports.

The following table lists common functions that you must now explicitly add an 

import

 

statement to use:

For more information on what packages global functions are in, see the global function’s entry 
in ActionScript 3.0 Language Reference.

The 

trace()

 function is an exception. It is in the flash.util package, but is implicitly 

imported.

Function

Package to import

ContextMenu

import flash.ui.ContextMenu;

EventDispatcher

import flash.events.EventDispatcher;
(was mx.events.EventDispatcher mix-in)

LocalConnection

import flash.net.LocalConnection;

MovieClip

import flash.display.MovieClip;

PopUpManager

import mx.managers.PopUpManager;

XML

import flash.xml.XMLNode;