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/*****************************************************************************
* Copyright (c) 2011 CEA LIST.
*
* 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:
*
* CEA LIST - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.sysml.diagram.internalblock.utils;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.UnexecutableCommand;
import org.eclipse.gmf.runtime.diagram.core.util.ViewUtil;
import org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart;
import org.eclipse.gmf.runtime.diagram.ui.requests.CreateViewRequest;
import org.eclipse.gmf.runtime.diagram.ui.requests.CreateViewRequest.ViewDescriptor;
import org.eclipse.gmf.runtime.diagram.ui.requests.DropObjectsRequest;
import org.eclipse.gmf.runtime.notation.Node;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.papyrus.infra.gmfdiag.common.utils.ViewDescriptorUtil;
import org.eclipse.papyrus.uml.diagram.common.commands.SemanticAdapter;
import org.eclipse.papyrus.uml.diagram.common.helper.ElementHelper;
import org.eclipse.uml2.uml.Port;
import org.eclipse.uml2.uml.Type;
import org.eclipse.uml2.uml.TypedElement;
/**
* This class provides convenience methods to create Type specific drop action (Show Port on BlockPropertyComposite).
*/
public class PortDropHelper extends ElementHelper {
public PortDropHelper(TransactionalEditingDomain editDomain) {
this.editDomain = editDomain;
}
public Command getDropPortOnPart(DropObjectsRequest request, GraphicalEditPart host) {
Object droppedEObject = request.getObjects().get(0);
if(!isValidPort(droppedEObject, getHostEObject(host))) {
return UnexecutableCommand.INSTANCE;
}
return getDropPortOnPart((Port)droppedEObject, request.getLocation().getCopy(), host);
}
public Command getDropPortOnPart(Port droppedPort, Point location, GraphicalEditPart host) {
if(!isValidPort(droppedPort, getHostEObject(host))) {
return UnexecutableCommand.INSTANCE;
}
// Prepare the view creation command
ViewDescriptor descriptor = new ViewDescriptor(new SemanticAdapter((EObject)droppedPort, null), Node.class, /* explicit semantic hint is mandatory */ null, ViewDescriptorUtil.PERSISTED, host.getDiagramPreferencesHint());
CreateViewRequest createViewRequest = new CreateViewRequest(descriptor);
createViewRequest.setLocation(location);
Command viewCreateCommand = host.getCommand(createViewRequest);
return viewCreateCommand;
}
private boolean isValidPort(Object object, EObject dropTarget) {
boolean isValid = false;
// The drop object is supposed to be a Port (or FlowPort)
if((object != null) && (object instanceof Port)) {
// The dropTarget has to be a TypedElement with a non-null Type
if((dropTarget != null) && (dropTarget instanceof TypedElement) && (((TypedElement)dropTarget).getType() != null)) {
Type targetType = ((TypedElement)dropTarget).getType();
// The dropped object is owned by the target type
if(((Port)object).eContainer() == targetType) {
isValid = true;
}
}
}
return isValid;
}
/**
* return the host Edit Part's semantic element, if the semantic element
* is <code>null</code> or unresolvable it will return <code>null</code>
*
* @return EObject
*/
protected EObject getHostEObject(GraphicalEditPart host) {
return ViewUtil.resolveSemanticElement((View)host.getModel());
}
}
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