diagrampart.java

eclipse开发笔记

package hellogef.control;

import hellogef.model.Diagram;
import hellogef.policy.DiagramLayoutEditPolicy;

import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.util.List;

import org.eclipse.draw2d.Figure;
import org.eclipse.draw2d.FreeformLayer;
import org.eclipse.draw2d.FreeformLayout;
import org.eclipse.draw2d.IFigure;
import org.eclipse.gef.EditPolicy;
import org.eclipse.gef.editparts.AbstractGraphicalEditPart;

public class DiagramPart extends AbstractGraphicalEditPart implements PropertyChangeListener {

	protected List getModelChildren() {
		return ((Diagram) this.getModel()).getNodes();
	}

	public void activate() {
		super.activate();
		((Diagram) getModel()).addPropertyChangeListener(this);
	}

	public void deactivate() {
		super.deactivate();
		((Diagram) getModel()).removePropertyChangeListener(this);
	}

	public void propertyChange(PropertyChangeEvent evt) {
		String prop = evt.getPropertyName();
		if (Diagram.PROP_NODE.equals(prop))
			refreshChildren();
	}

	protected IFigure createFigure() {
		Figure figure = new FreeformLayer();
		figure.setLayoutManager(new FreeformLayout());
		return figure;
	}

	protected void createEditPolicies() {
		installEditPolicy(EditPolicy.LAYOUT_ROLE, new DiagramLayoutEditPolicy());
	}

}