/* uDig - User Friendly Desktop Internet GIS client
* http://udig.refractions.net
* (C) 2011, Refractions Research Inc.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* (http://www.eclipse.org/legal/epl-v10.html), and the Refractions BSD
* License v1.0 (http://udig.refractions.net/files/bsd3-v10.html).
*/
package org.locationtech.udig.project.ui.internal.aoi;
import org.locationtech.udig.aoi.AOIListener;
import org.locationtech.udig.aoi.IAOIStrategy;
import org.locationtech.udig.project.IMap;
import org.locationtech.udig.project.render.IViewportModel;
import org.locationtech.udig.project.render.IViewportModelListener;
import org.locationtech.udig.project.render.ViewportModelEvent;
import org.locationtech.udig.project.ui.ApplicationGIS;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.geom.GeometryFactory;
/**
* Returns an empty ReferencedEnvelope so that zoom to extent goes to all
* @author pfeiffp
*
*/
public class ScreenAOIStrategy extends IAOIStrategy {
private static String name = "Screen";
protected IViewportModelListener watcher = new IViewportModelListener(){
@Override
public void changed( ViewportModelEvent viewportEvent ) {
AOIListener.Event aoiEvent = new AOIListener.Event( ScreenAOIStrategy.this);
if( viewportEvent.getType() == ViewportModelEvent.EventType.BOUNDS ){
aoiEvent.bounds = (ReferencedEnvelope) viewportEvent.getNewValue();
}
else {
aoiEvent.bounds = viewportEvent.getSource().getBounds();
}
notifyListeners( aoiEvent);
}
};
public ScreenAOIStrategy() {
listenToViewport();
}
private void listenToViewport() {
IViewportModel viewportModel = ApplicationGIS.getActiveMap().getViewportModel();
viewportModel.addViewportModelListener(watcher);
}
@Override
public ReferencedEnvelope getExtent() {
IMap currentMap = ApplicationGIS.getActiveMap();
if (!currentMap.equals(ApplicationGIS.NO_MAP)) {
return currentMap.getViewportModel().getBounds();
}
return null;
}
@Override
public Geometry getGeometry() {
ReferencedEnvelope extent = this.getExtent();
if (extent != null) {
return new GeometryFactory().toGeometry(extent);
}
return null;
}
@Override
public CoordinateReferenceSystem getCrs() {
IMap currentMap = ApplicationGIS.getActiveMap();
if (!currentMap.equals(ApplicationGIS.NO_MAP)) {
return currentMap.getViewportModel().getCRS();
}
return null;
}
@Override
public String getName() {
return name;
}
}