Flex-创建新的基元

package ui.helpers
{
    import flash.display.Graphics;

    import spark.primitives.supportClasses.StrokedElement;

    public class SGrid extends StrokedElement
    {
        public function SGrid()
        {
            super();
        }

        private var _gridSize:Number;
        [Inspectable(category=\"General\", minValue=\"1.0\")]

        public function get gridSize():Number 
        {
            return _gridSize;
        }

        public function set gridSize(value:Number):void
        {        
            if (value != _gridSize)
            {
                _gridSize = value;
                invalidateSize();
                invalidateDisplayList();
                invalidateParentSizeAndDisplayList();
            }
        }

        override protected function draw(g:Graphics):void {

            for(var x:int; x < width; x+= _gridSize) {
                g.moveTo(x,0);
                g.lineTo(x,height);
            }
            for(var y:int; y < height; y+= _gridSize) {
                g.moveTo(0,y);
                g.lineTo(width,y);
            }

        }

    }
} 

<helpers:SGrid id=\"gridOne\" width=\"100\" height=\"200\" gridSize=\"10\">
        <s:stroke>
            <s:SolidColorStroke color=\"0xCCCCCC\" alpha=\"0.8\" />
        </s:stroke>
    </helpers:SGrid>

<helpers:SGrid id=\"gridOne\" width=\"100\" height=\"200\" gridSize=\"10\">
        <helpers:stroke>
            <s:SolidColorStroke color=\"0xCCCCCC\" alpha=\"0.8\" />
        </helpers:stroke>
    </helpers:SGrid>