Macromedia flex 2-migrating applications to flex 2 Manuel D’Utilisation

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Flex Classes

Core classes

The UIObject and UIComponent classes have been combined. As a result, references to the 
UIObject class should be replaced by UIComponent. Visual Flex controls are subclasses of the 
UIComponent class (formerly UIObject). In Flex 1.5, the UIComponent class was a 
descendent of the MovieClip class. Now, the UIComponent class descends from the Sprite 
class. The following example shows the full hierarchy of a Flex control, such as the Button 
control:

Object

|
+--flash.events.EventDispatcher

|
+--flash.display.DisplayObject

|
+--flash.display.InteractiveObject

|
+--flash.display.FlashContainer

|
+--flash.display.Sprite

|
+--mx.core.UIComponent

|
+--mx.controls.Button

The EventDispatcher class was a mixin. It is now a base class in the flash.events package.

This section describes changes to Flex classes in the mx.core package.

mx.core.Application

The Application class now directly extends mx.core.Container instead of mx.containers.Box. 

The following table describes changes to the mx.core.Application class:

Member

Change description

alert()

Removed. You must now use the 

mx.controls.Alert.show()

 method. For information about 

additional changes to Alert, see 

attachApplication

Removed.

backgroundColor

For information on changes to setting the 

backgroundColor

 

style property, see the entry for 

fillAlphas

/

fillColors

.

className

Removed. Now on UIComponent.

constructObject()

Removed.