GWT Maps api v3 Custom overlays

to Implement GWT widgets using Google Maps  v3 :

import com.google.gwt.core.client.JavaScriptObject;

import com.google.gwt.dom.client.Style;

import com.google.gwt.maps.client.HasMap;

import com.google.gwt.maps.client.base.LatLng;

import com.google.gwt.maps.client.base.Point;

import com.google.gwt.maps.client.overlay.OverlayView;

import com.google.gwt.user.client.DOM;

import com.google.gwt.user.client.Element;

import com.google.gwt.user.client.ui.HTML;

import com.google.gwt.user.client.ui.SimplePanel;

public class GWTMapWidget 

{

    private Element     div;

    private LatLng      latLng;

    private SimplePanel textPanel;

    private String      text;

    private OverlayView overlay = new OverlayView ()

    {

        @Override

        public void draw ()

        {

            Point sw = (Point) overlay.getProjection ().fromLatLngToDivPixel (overlay.getMap ().getBounds ().getSouthWest ());

            Point ne = (Point) overlay.getProjection ().fromLatLngToDivPixel (overlay.getMap ().getBounds ().getNorthEast ());

            Point p = (Point) overlay.getProjection ().fromLatLngToDivPixel (latLng);

        //    System.out.println (p.getX () + " " + p.getY ());

        //      div.getStyle ().setTop (ne.getY (), Style.Unit.PX);

        //     div.getStyle ().setLeft (sw.getX (), Style.Unit.PX);

            div.getStyle ().setTop (p.getY (), Style.Unit.PX);

            div.getStyle ().setLeft (p.getX (), Style.Unit.PX);

            div.getStyle ().setWidth (ne.getX ()-sw.getX (), Style.Unit.PX);

            div.getStyle ().setHeight (sw.getY ()-sw.getY (), Style.Unit.PX);

            div.getStyle ().setDisplay (Style.Display.BLOCK);

            div.getStyle ().setZIndex (99);

        }

        @Override

        public void onAdd ()

        {

            div = DOM.createElement ("div");

            div.getStyle ().setBorderStyle (Style.BorderStyle.NONE);

            div.getStyle ().setBorderWidth (0, Style.Unit.PX);

            div.getStyle ().setPosition (Style.Position.ABSOLUTE);

            div.appendChild (textPanel.getElement ());

            overlay.getPanes ().getFloatPane ().appendChild (div);

        }

        @Override

        public void onRemove ()

        {

            div.getParentNode ().removeChild (div);

            // div.removeFromParent ();

            textPanel.removeFromParent ();

            div = null;

            textPanel = null;

        }

    };

    public GWTMapWidget (LatLng latLng, TextPanel textPanel , HasMap map)

    {

        this.latLng = latLng;

        // System.out.println (latLng.getLatitude () + " - " + latLng.getLongitude ());

        this.text = text;

        HTML textWidget = new HTML (text);

       this. textPanel = textPanel ;      

        overlay.setMap (map);

    }

}

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