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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