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  package com.bonevich.eclipse.cvsgrapher.editors;
  
  import com.bonevich.eclipse.cvsgrapher.model.ICvsGraphNodeModel;
  
  import org.eclipse.draw2d.ConnectionAnchor;
  import org.eclipse.draw2d.geometry.Point;
  import org.eclipse.draw2d.geometry.Rectangle;
  import org.eclipse.gef.ConnectionEditPart;
  import org.eclipse.gef.GraphicalEditPart;
  import org.eclipse.gef.Request;
  import org.eclipse.gef.editparts.AbstractGraphicalEditPart;
  import org.eclipse.swt.SWT;
  import org.eclipse.swt.graphics.Font;
  
  import java.beans.PropertyChangeEvent;
  import java.beans.PropertyChangeListener;
  import java.util.List;
  
  /***
   * Base class for node (version, branch) controller edit parts.
   * 
   * @author jbonevic
   */
  public abstract class AbstractCvsGraphNodeEditPart
  	extends AbstractGraphicalEditPart
  	implements ICvsGraphNodeEditPart, PropertyChangeListener
  {
  	protected static final Font VERSION   = new Font(null, "Helvetica", 10, SWT.BOLD);
  	protected static final Font INFO = new Font(null, "Helvetica", 8, SWT.NORMAL);
  	
  	/*** The figure's anchor. */
  	private ConnectionAnchor _anchor;
  
  	/***
  	 * Solely to intercept events in the graph. This way the model objects are
  	 * not sullied with view information (location, size).
  	 */
  	private CvsGraphNodeViewHelper _helper;
  
  	/***
  	 * @see org.eclipse.gef.editparts.AbstractEditPart#createEditPolicies()
  	 */
 	protected void createEditPolicies()
 	{
 		// For some reasons I do not quite understand, the
 		// CvsGraphXYLayoutEditPolicy.createChildEditPolicy() must be 
 		// used instead of a PRIMARY_DRAG_ROLE edit policy here.
 	}
 
 	/***
 	 * @see org.eclipse.gef.editparts.AbstractEditPart#refreshVisuals()
 	 */
 	protected void refreshVisuals()
 	{
 //		System.out.println("[AbstractCvsGraphNodeEditPart] refreshVisuals");
 		Point loc = _helper.getLocation();
 //		System.out.println("[AbstractCvsGraphNodeEditPart] refreshVisuals: location = " + loc);
 		if (loc != null)
 		{
 			Rectangle r = new Rectangle(loc, CvsGraphNodeViewHelper.PREFERRED_SIZE);
 			((GraphicalEditPart) getParent()).setLayoutConstraint(this, getFigure(), r);
 		}
 	}
 
 	/***
 	 * @see java.beans.PropertyChangeListener#propertyChange(PropertyChangeEvent)
 	 */
 	public void propertyChange(PropertyChangeEvent evt)
 	{
 		String prop = evt.getPropertyName();
 		if (prop.equals("size") || prop.equals("location"))
 		{
 			refreshVisuals();
 		}
 	}
 
 	/***
 	 * @see org.eclipse.gef.EditPart#activate()
 	 */
 	public void activate()
 	{
 		if (isActive() == false)
 		{
 			super.activate();
 			_helper.addPropertyChangeListener(this);
 		}
 	}
 
 	/***
 	 * @see org.eclipse.gef.EditPart#deactivate()
 	 */
 	public void deactivate()
 	{
 		if (isActive())
 		{
 			super.deactivate();
 			_helper.removePropertyChangeListener(this);
 		}
 	}
 
 	/***
 	 * @see org.eclipse.gef.editparts.AbstractGraphicalEditPart#getModelSourceConnections()
 	 */
 	protected List getModelSourceConnections()
 	{
 		return getNodeModel().getSourceConnections();
 	}
 	
 	protected ICvsGraphNodeModel getNodeModel()
 	{
 		return ((ICvsGraphNodeModel) getModel());
 	}
 
 	/***
 	 * @see org.eclipse.gef.editparts.AbstractGraphicalEditPart#getModelTargetConnections()
 	 */
 	protected List getModelTargetConnections()
 	{
 		return getNodeModel().getTargetConnections();
 	}
 
 	/***
 	 * @see org.eclipse.gef.editparts.AbstractEditPart#createConnection(Object)
 	 */
 	protected ConnectionEditPart createConnection(Object iModel)
 	{
 		// The line below is based on Logical Diagram Editor's LogicEditPart.createConnection()
 		// It looks like an EditPart cache mechanism for EditPart connections, but I need
 		// to make sure of that...
 		CvsGraphConnectionEditPart connectPart =
 			(CvsGraphConnectionEditPart) getRoot().getViewer().getEditPartRegistry().get(iModel);
 		if (connectPart == null)
 		{
 			connectPart = new CvsGraphConnectionEditPart();
 			connectPart.setModel(iModel);
 		}
 
 		return connectPart;
 	}
 
 	/***
 	 * @see org.eclipse.gef.NodeEditPart#getSourceConnectionAnchor(ConnectionEditPart)
 	 */
 	public ConnectionAnchor getSourceConnectionAnchor(ConnectionEditPart connection)
 	{
 		return _anchor;
 	}
 
 	/***
 	 * @see org.eclipse.gef.NodeEditPart#getSourceConnectionAnchor(Request)
 	 */
 	public ConnectionAnchor getSourceConnectionAnchor(Request request)
 	{
 		return null;
 	}
 
 	/***
 	 * @see org.eclipse.gef.NodeEditPart#getTargetConnectionAnchor(ConnectionEditPart)
 	 */
 	public ConnectionAnchor getTargetConnectionAnchor(ConnectionEditPart connection)
 	{
 		return _anchor;
 	}
 
 	/***
 	 * @see org.eclipse.gef.NodeEditPart#getTargetConnectionAnchor(Request)
 	 */
 	public ConnectionAnchor getTargetConnectionAnchor(Request request)
 	{
 		return null;
 	}
 
 	protected void setViewHelper(CvsGraphNodeViewHelper helper)
 	{
 		_helper = helper;
 	}
 
 	public CvsGraphNodeViewHelper getViewHelper()
 	{
 		return _helper;
 	}
 
 	protected void setAnchor(ConnectionAnchor anchor)
 	{
 		_anchor = anchor;
 	}
 
 }