MACROMEDIA FLEX-GETTING STARTED WITH FLEX Manuale Utente Scaricare il pdf (Pagina 59)

application window. The container’s layout

property must be

set to absolute. All constraints are set relative to the edges of

the container, not to other controls in the container. The left,

right, top, bottom, horizontalCenter, and verticalCenter

properties are anchors in constraint-based layouts.

Example 4-6 shows the code for positioning children in a con-

straint-based layout using the top, bottom, left, right, horizon

talCenter, and verticalCenter styles.

Example 4-6. Photo.mxml

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

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

layout="absolute backgroundColor="#FFFFFF"

backgroundAlpha="0">

<mx:HDividedBox width="100%" height="300">

<mx:Canvas backgroundColor="#FFFFCC" width="150"

height="100%">

<mx:Label text="Adjust this section" left="15" />

</mx:Canvas>

<mx:Canvas>

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

<mx:Image source="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"/>

Figure 4-5. An absolutely positioned image

The Canvas Container (Relative Positioning) | 43

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MACROMEDIA FLEX-GETTING STARTED WITH FLEX Manuale Utente Pagina 59