package layouts
{
import mx.core.ILayoutElement;
import spark.layouts.supportClasses.LayoutBase;
public class CircularLayout extends LayoutBase
{
public function CircularLayout()
{
super();
}
override public function updateDisplayList(w:Number, h:Number):void
{
super.updateDisplayList(w, h);
if (!target)
return;
var layoutElement:ILayoutElement;
var count:uint = target.numElements;
trace(count);
var radius : Number = Math.min( target.width/2, target.height/2 ) - 25;
var _x:Number=0;
var _y:Number=0;
var angleRadians:Number=2*Math.PI/count;
var ar:Number=0;
var centerX:Number=target.width/2;
var centerY:Number=target.height/2;
for (var i:int = 0; i < count; i++)
{
layoutElement = target.getElementAt(i);
var width:Number=layoutElement.getLayoutBoundsWidth();
var height:Number=layoutElement.getLayoutBoundsHeight();
_x=Math.sin( ar )*radius+centerX-width/2;
_y=centerY-Math.cos(ar)*radius-height/2;
trace("x:"+_x+" y:"+_y);
trace("width:"+layoutElement.getLayoutBoundsWidth()+" height:"+layoutElement.getLayoutBoundsHeight());
// layoutElement.setLayoutBoundsSize(70,20);
layoutElement.setLayoutBoundsPosition(_x,_y);
ar=ar+angleRadians;
}
}
}
}
mxml代码:
<s:BorderContainer x="202" y="144" width="200" height="200">
<!-- -->
<s:layout>
<layouts:CircularLayout />
</s:layout>
<s:Button label="Button" width="70" height="20"/>
<s:Button label="Button" width="70" height="20"/>
<s:Button label="Button" width="70" height="20"/>
<s:Button label="Button" width="70" height="20"/>
<s:Button label="Button" width="70" height="20"/>
<s:Button label="Button" width="70" height="20"/>
</s:BorderContainer>
效果: