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The Box Class

The Box class is the base class for the VBox and HBox classes:

• The VBox container renders all child display objects verti-

cally.

• The HBox container renders all child display objects hori-

zontally.

The Application object behaves like a VBox by default (vertical

layout), but you can also set it to use absolute or horizontal

layout.

VBox and HBox flow like HTML, only in one direction.

Example 4-2 shows the default layout method used by the

VBox container (vertical).

Example 4-2. Using the VBox container

<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"

backgroundColor="#FFFFFF" backgroundAlpha="0">

<mx:VBox>

<mx:Button label="< prev" left="10" top="120" />

<mx:Image source="assets/animals03.jpg" horizontalCenter="0"

top="30"/>

<mx:Label text="Photographed by Elsie Weil"

horizontalCenter="0" top="250"/>

<mx:Button label="next >" right="10" top="120"/>

</mx:VBox>

</mx:Application>

Figure 4-2 shows the result of this code.

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MACROMEDIA FLEX-GETTING STARTED WITH FLEX Manuale Utente Pagina 55