source: osm/applications/editors/josm/plugins/wmsplugin/src/wmsplugin/WMSAdjustAction.java@ 13584

package wmsplugin; 

import static org.openstreetmap.josm.tools.I18n.tr;

import java.awt.Cursor;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;

import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.gui.MapFrame;
import org.openstreetmap.josm.actions.mapmode.MapMode;
import org.openstreetmap.josm.data.coor.EastNorth;
import org.openstreetmap.josm.tools.ImageProvider;
import org.openstreetmap.josm.gui.layer.Layer;


public class WMSAdjustAction extends MapMode implements
    MouseListener, MouseMotionListener{

    GeorefImage selectedImage;
    WMSLayer selectedLayer;
    boolean mouseDown;
    EastNorth prevEastNorth;

    public WMSAdjustAction(MapFrame mapFrame) {
        super(tr("Adjust WMS"), "adjustwms", 
                        tr("Adjust the position of the selected WMS layer"), mapFrame, 
                        ImageProvider.getCursor("normal", "move"));
    }

    @Override public void enterMode() {
        super.enterMode();
        Main.map.mapView.addMouseListener(this);
        Main.map.mapView.addMouseMotionListener(this);
    }

    @Override public void exitMode() {
        super.exitMode();
        Main.map.mapView.removeMouseListener(this);
        Main.map.mapView.removeMouseMotionListener(this);
    }

    @Override public void mousePressed(MouseEvent e) {
        if (e.getButton() != MouseEvent.BUTTON1)
            return;
        
        Layer layer=Main.map.mapView.getActiveLayer();
        if (layer.visible && layer instanceof WMSLayer) {
            prevEastNorth=Main.map.mapView.getEastNorth(e.getX(),e.getY());
            selectedLayer = ((WMSLayer)layer);
            selectedImage = selectedLayer.findImage(prevEastNorth);
            if(selectedImage!=null) {
                Main.map.mapView.setCursor
                    (Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR));
            }
        }
    }

    @Override public void mouseDragged(MouseEvent e) {
        if(selectedImage!=null) {
            EastNorth eastNorth=
                    Main.map.mapView.getEastNorth(e.getX(),e.getY());
            selectedLayer.displace(
                eastNorth.east()-prevEastNorth.east(), 
                eastNorth.north()-prevEastNorth.north()
            );
            prevEastNorth = eastNorth;
            Main.map.mapView.repaint();
        }
    }

    @Override public void mouseReleased(MouseEvent e) {
        Main.map.mapView.repaint();
        Main.map.mapView.setCursor(Cursor.getDefaultCursor());
        selectedImage = null;   
        prevEastNorth = null;
        selectedLayer = null;
    }

    public void mouseEntered(MouseEvent e) {
    }
    public void mouseExited(MouseEvent e) {
    }
    public void mouseMoved(MouseEvent e) {
    }

    @Override public void mouseClicked(MouseEvent e) {
    }
    
    // This only makes the buttons look disabled, but since no keyboard shortcut is
    // provided there aren't any other means to activate this tool
    @Override public boolean layerIsSupported(Layer l) {
        return (l instanceof WMSLayer) && l.visible;
    }
}