package de.intevation.flys.client.client.ui.map;

import com.smartgwt.client.widgets.Canvas;
import com.smartgwt.client.widgets.Label;
import com.smartgwt.client.widgets.events.MouseMoveEvent;
import com.smartgwt.client.widgets.events.MouseMoveHandler;
import com.smartgwt.client.widgets.layout.HLayout;

import org.gwtopenmaps.openlayers.client.LonLat;
import org.gwtopenmaps.openlayers.client.Map;
import org.gwtopenmaps.openlayers.client.MapWidget;
import org.gwtopenmaps.openlayers.client.Pixel;


/**
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class MapPositionPanel extends HLayout {

    protected MapWidget mapWidget;
    protected Map       map;

    protected Label  x;
    protected Label  y;


    public MapPositionPanel(MapWidget mapWidget, final Canvas c) {
        this.mapWidget = mapWidget;
        this.map       = mapWidget.getMap();

        this.x  = new Label();
        this.y  = new Label();
        Label d = new Label("|");

        setWidth(60);
        setMembersMargin(2);

        x.setWidth(25);
        y.setWidth(25);
        d.setWidth(5);

        addMember(x);
        addMember(d);
        addMember(y);

        // TODO We should use the MousePosition control provided by
        // GwtOpenLayers here instead of calculating the mouse pos manually.
        c.addMouseMoveHandler(new MouseMoveHandler() {
            public void onMouseMove(MouseMoveEvent e) {
                int x = e.getX() - c.getPageLeft();
                int y = e.getY() - c.getPageTop();

                LonLat point = map.getLonLatFromPixel(new Pixel(x, y));
                setX(point.lon());
                setY(point.lat());
            }
        });
    }


    protected void setX(double x) {
        this.x.setContents(String.valueOf(x));
    }


    protected void setY(double y) {
        this.y.setContents(String.valueOf(y));
    }
}
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