source: EDIS/trunk/java/tracking-ui-core/src/main/flex/gov/va/med/edp/widget/CenteredEmbedImage.as@ 1227

package gov.va.med.edp.widget
{
        import flash.display.DisplayObject;
import mx.events.FlexEvent;
import mx.core.UIComponent;
import mx.controls.listClasses.BaseListData;
import mx.controls.listClasses.IListItemRenderer;
import mx.controls.listClasses.IDropInListItemRenderer;

/**
 *  assumes the image is embedded and not a .swf
 */
public class CenteredEmbedImage extends UIComponent implements IListItemRenderer, IDropInListItemRenderer
{

        public function CenteredEmbedImage()
        {
                super();
        }

    //----------------------------------
    //  data
    //----------------------------------

    /**
     *  @private
     *  Storage for the data property.
     */
    private var _data:Object;

    [Bindable("dataChange")]
    [Inspectable(environment="none")]

    /**
     *  Lets you pass a value to the component
     *  when you use it in an item renderer or item editor.
     *  You typically use data binding to bind a field of the <code>data</code>
     *  property to a property of this component.
     *
     *  <p>When you use the control as a drop-in item renderer or drop-in
     *  item editor, Flex automatically writes the current value of the item
     *  to the <code>text</code> property of this control.</p>
     *
     *  <p>You do not set this property in MXML.</p>
     *
     *  @default null
     *  @see mx.core.IDataRenderer
     */
    public function get data():Object
    {
        return _data;
    }

    /**
     *  @private
     */
    public function set data(value:Object):void
    {
        var newText:*;

        _data = value;

                invalidateProperties();

        dispatchEvent(new FlexEvent(FlexEvent.DATA_CHANGE));
    }

    //----------------------------------
    //  listData
    //----------------------------------

    /**
     *  @private
     *  Storage for the listData property.
     */
    private var _listData:BaseListData;

    [Bindable("dataChange")]
    [Inspectable(environment="none")]

    /**
     *  When a component is used as a drop-in item renderer or drop-in
     *  item editor, Flex initializes the <code>listData</code> property
     *  of the component with the appropriate data from the List control.
     *  The component can then use the <code>listData</code> property
     *  to initialize the <code>data</code> property of the drop-in
     *  item renderer or drop-in item editor.
     *
     *  <p>You do not set this property in MXML or ActionScript;
     *  Flex sets it when the component is used as a drop-in item renderer
     *  or drop-in item editor.</p>
     *
     *  @default null
     *  @see mx.controls.listClasses.IDropInListItemRenderer
     */
    public function get listData():BaseListData
    {
        return _listData;
    }

    /**
     *  @private
     */
    public function set listData(value:BaseListData):void
    {
        _listData = value;
    }

        private var img:DisplayObject;

        /**
         *  create the image instance now that we know what it is
         */
        override protected function commitProperties():void
        {
                super.commitProperties();

                if (listData)
                {
                        // remove the old child if we have one
                        if (img)
                                removeChild(img);

                        var c:Class = UIComponent(owner).document[listData.label];
                        img = new c();
                        addChild(img);
                }
        }

        /**
         *  create the image instance now that we know what it is
         */
        override protected function measure():void
        {
                super.measure();

                if (img)
                {
                        measuredHeight = img.height;
                        measuredWidth = img.width;
                }
        }

        /**
         *  center the contentHolder
         */
        override protected function updateDisplayList(w:Number, h:Number):void
        {
                super.updateDisplayList(w, h);

                if (img)
                {
                        img.x = (w - img.width) / 2;
                }
        }

}

}