org.eclipse.gmf.runtime.diagram.ui/src/org/eclipse/gmf/runtime/diagram/ui/internal/editparts/DiagramLinkEditPart.java

/******************************************************************************
 * Copyright (c) 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    IBM Corporation - initial API and implementation 
 ****************************************************************************/

package org.eclipse.gmf.runtime.diagram.ui.internal.editparts;

import org.eclipse.draw2d.MarginBorder;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.EditPolicy;

import org.eclipse.gmf.runtime.common.ui.services.parser.CommonParserHint;
import org.eclipse.gmf.runtime.diagram.ui.editparts.ShapeNodeEditPart;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.EditPolicyRoles;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.OpenDiagramEditPolicy;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.ViewComponentEditPolicy;
import org.eclipse.gmf.runtime.diagram.ui.internal.editpolicies.NonSemanticEditPolicy;
import org.eclipse.gmf.runtime.draw2d.ui.figures.ConstrainedToolbarLayout;
import org.eclipse.gmf.runtime.gef.ui.figures.DefaultSizeNodeFigure;
import org.eclipse.gmf.runtime.gef.ui.figures.NodeFigure;
import org.eclipse.gmf.runtime.notation.View;

/**
 * Edit Part which supports only diagram links.
 * 
 * @author jcorchis
 * @canBeSeenBy org.eclipse.gmf.runtime.diagram.ui.*
 */
public class DiagramLinkEditPart extends ShapeNodeEditPart {


	/**
	 * @param view
	 */
	public DiagramLinkEditPart(View view) {
		super(view);
	}

	/**
	 * @see org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart#createDefaultEditPolicies()
	 */
	protected void createDefaultEditPolicies() {
		super.createDefaultEditPolicies();

		// Remove semantic edit policy and install a non-semantic edit policy
		removeEditPolicy(EditPolicyRoles.SEMANTIC_ROLE);
		installEditPolicy(EditPolicyRoles.SEMANTIC_ROLE,
			new NonSemanticEditPolicy());

		// The following edit policy support the link open.		
		installEditPolicy(
			EditPolicyRoles.OPEN_ROLE,
			new OpenDiagramEditPolicy());	
		
		installEditPolicy(
			EditPolicy.COMPONENT_ROLE,
			new ViewComponentEditPolicy());
	}

	/**
	 * @see org.eclipse.gmf.runtime.diagram.ui.editparts.ShapeNodeEditPart#createNodeFigure()
	 */
	protected NodeFigure createNodeFigure() {
		Dimension defaultSize = new Dimension(getMapMode().DPtoLP(100), getMapMode().DPtoLP(25));
		DefaultSizeNodeFigure fig = new DefaultSizeNodeFigure(defaultSize.width, defaultSize.height);
		int margin = getMapMode().DPtoLP(5);
		fig.setBorder(new MarginBorder(margin, margin, margin, margin));
		fig.setLayoutManager(new ConstrainedToolbarLayout());
		fig.setOpaque(true);
		fig.setDefaultSize(defaultSize);
		return fig;
	}
	
	/**
	 * this method will return the primary child EditPart  inside this edit part
	 * @return the primary child view inside this edit part
	 */
	public EditPart getPrimaryChildEditPart(){
		return getChildBySemanticHint(CommonParserHint.DESCRIPTION);
	}
}