flowletwithlabeleditpart.java

一个java写的business process management系统

/*
 * Copyright (c) 2003, Alexander Greif
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 * 
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Flow4J-Eclipse project nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

package net.orthanc.flow4j.designer.editparts;

import java.beans.PropertyChangeEvent;
import java.util.Iterator;

import net.orthanc.flow4j.designer.editparts.policies.FlowletWithLabelEditPolicy;
import net.orthanc.flow4j.designer.model.FlowDiagramElementModelPart;
import net.orthanc.flow4j.designer.model.FlowletWithLabelModelPart;

import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.gef.EditPolicy;

/**
 * Edit Part of a Flowlet that has a label
 * @author agreif
 */
abstract public class FlowletWithLabelEditPart extends FlowletEditPart {



	/**
	 * @see org.eclipse.gef.editparts.AbstractEditPart#createEditPolicies()
	 */
	protected void createEditPolicies() {
		super.createEditPolicies();
		installEditPolicy(EditPolicy.COMPONENT_ROLE, new FlowletWithLabelEditPolicy());
	}


	/**
	 * Returns the corresponding <code>FlowletLabelEditPart</code>.
	 * Scans through all editParts and returns one that's model 
	 * is the same as the flowletLabel of this instance. Returns <code>null</code>
	 * if not found.
	 * 
	 * @return the FlowletLabelEditPart of this instance
	 */
	protected FlowletLabelEditPart getFlowletLabelEditPart() {
		for (Iterator editPartsIter = getParent().getChildren().iterator(); editPartsIter.hasNext();) {
			FlowDiagramElementEditPart editPart = (FlowDiagramElementEditPart)editPartsIter.next();
			if (editPart instanceof FlowletLabelEditPart) {
				FlowletLabelEditPart flep = (FlowletLabelEditPart)editPart;
				if (((FlowletWithLabelModelPart)getModel()).getFlowletLabel() == flep.getModel()) {
					return flep;
				}
			}
		}
		
		return null;
	}


	/**
	 * Returns the model instance
	 * @return the model instance
	 */
	public FlowletWithLabelModelPart getFlowletWithLabel() {
		return (FlowletWithLabelModelPart)getModel();
	}

	/**
	 * Moves the label together with the flowlet.
	 * @see java.beans.PropertyChangeListener#propertyChange(java.beans.PropertyChangeEvent)
	 */
	public void propertyChange(PropertyChangeEvent evt) {
		String propName = evt.getPropertyName();
		if (FlowDiagramElementModelPart.PROP_LOCATION.equals(propName)) {
			Point oldPos = (Point)evt.getOldValue();
			Point newPos = (Point)evt.getNewValue();
			super.propertyChange(evt);
			Dimension flowletTrans = newPos.getDifference(oldPos);
			FlowletLabelEditPart labelEditPart = getFlowletLabelEditPart();
			if (labelEditPart != null) {
				labelEditPart.getFlowletLabel().setLocation(
					labelEditPart.getFlowletLabel().getLocation().getTranslated(flowletTrans));
			} else
				System.out.println("Label not found for : " + this);
		}
		else
			super.propertyChange(evt);
	}

}