/*******************************************************************************
* Copyright (c) 2004, 2005 Elias Volanakis 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:
�*����Elias Volanakis - initial API and implementation
�*******************************************************************************/
package org.asem.eclipse.mii.model.parts;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import org.asem.eclipse.mii.model.abs.AbstractModelElement;
import org.asem.eclipse.mii.model.abs.Connection;
import org.asem.eclipse.mii.model.abs.ShapeConstants;
import org.asem.eclipse.mii.model.commands.ConnectionDeleteCommand;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.PolygonDecoration;
import org.eclipse.draw2d.PolylineConnection;
import org.eclipse.gef.EditPolicy;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.editparts.AbstractConnectionEditPart;
import org.eclipse.gef.editpolicies.ConnectionEditPolicy;
import org.eclipse.gef.editpolicies.ConnectionEndpointEditPolicy;
import org.eclipse.gef.requests.GroupRequest;
/**
* Edit part for Connection model elements.
* <p>
* This edit part must implement the PropertyChangeListener interface, so it can be notified of property changes in the
* corresponding model element.
* </p>
*
* @author Elias Volanakis
*/
class ConnectionEditPart extends AbstractConnectionEditPart implements PropertyChangeListener {
/**
* Upon activation, attach to the model element as a property change listener.
*/
public void activate() {
if (!isActive()) {
super.activate();
((AbstractModelElement) getModel()).addPropertyChangeListener(this);
}
}
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editparts.AbstractEditPart#createEditPolicies()
*/
protected void createEditPolicies() {
// Selection handle edit policy.
// Makes the connection show a feedback, when selected by the user.
installEditPolicy(EditPolicy.CONNECTION_ENDPOINTS_ROLE, new ConnectionEndpointEditPolicy());
// Allows the removal of the connection model element
installEditPolicy(EditPolicy.CONNECTION_ROLE, new ConnectionEditPolicy() {
protected Command getDeleteCommand(GroupRequest request) {
return new ConnectionDeleteCommand(getCastedModel());
}
});
}
/*
* (non-Javadoc)
*
* @see org.eclipse.gef.editparts.AbstractGraphicalEditPart#createFigure()
*/
protected IFigure createFigure() {
PolylineConnection connection = (PolylineConnection) super.createFigure();
connection.setTargetDecoration(new PolygonDecoration()); // arrow at
// target
// endpoint
connection.setLineStyle(getCastedModel().getLineStyle()); // line
// drawing
// style
return connection;
}
/**
* Upon deactivation, detach from the model element as a property change listener.
*/
public void deactivate() {
if (isActive()) {
super.deactivate();
((AbstractModelElement) getModel()).removePropertyChangeListener(this);
}
}
private Connection getCastedModel() {
return (Connection) getModel();
}
/*
* (non-Javadoc)
*
* @see java.beans.PropertyChangeListener#propertyChange(java.beans. PropertyChangeEvent)
*/
public void propertyChange(PropertyChangeEvent event) {
String property = event.getPropertyName();
if (ShapeConstants.LINESTYLE_PROP.equals(property)) {
((PolylineConnection) getFigure()).setLineStyle(getCastedModel().getLineStyle());
}
}
}