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/*****************************************************************************
* Copyright (c) 2012 CEA LIST.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.infra.gmfdiag.dnd.strategy;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.Request;
import org.eclipse.gef.requests.ChangeBoundsRequest;
import org.eclipse.gef.requests.GroupRequest;
import org.eclipse.gef.tools.ToolUtilities;
import org.eclipse.gmf.runtime.diagram.core.util.ViewUtil;
import org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart;
import org.eclipse.gmf.runtime.diagram.ui.requests.DropObjectsRequest;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.papyrus.infra.emf.utils.EMFHelper;
import org.eclipse.papyrus.infra.gmfdiag.common.helper.NotationHelper;
import org.eclipse.swt.dnd.DND;
/**
* An abstract implementation of a DropStrategy, which provides helper methods
*
* @author Camille Letavernier
*/
public abstract class AbstractDropStrategy implements DropStrategy {
/**
* Returns the Semantic element which is the drop target
*
* @param targetEditPart
* The drop target edit part
* @return
* The drop target semantic element
*/
protected EObject getTargetSemanticElement(EditPart targetEditPart) {
return EMFHelper.getEObject(targetEditPart);
}
/**
* Returns the Notation View which is the drop target
*
* @param targetEditPart
* The drop target edit part
* @return
* The drop target notation View
*/
protected View getTargetView(EditPart targetEditPart) {
return NotationHelper.findView(targetEditPart);
}
/**
* Returns the list of selected objects. The objects can be of any type.
*
* @param request
* The drop request
* @return
* The list of dropped Objects
*/
protected List<Object> getSourceObjects(Request request) {
List<Object> result = new LinkedList<>();
if (request instanceof DropObjectsRequest) {
List objects = ((DropObjectsRequest) request).getObjects();
if (objects != null) {
result.addAll(objects);
}
} else if (request instanceof GroupRequest) {
List editParts = ((ChangeBoundsRequest) request).getEditParts();
if (editParts != null) {
result.addAll(editParts);
}
}
return result;
}
/**
* Returns the list of semantic EObjects being dropped. If some of the dropped elements
* cannot be resolved to EObjects, they are ignored.
*
* @param request
* The drop request
* @return
* The list of dropped EObjects
*/
protected List<EObject> getSourceEObjects(Request request) {
List<EObject> result = new LinkedList<>();
for (Object object : getSourceObjects(request)) {
EObject eObject = EMFHelper.getEObject(object);
if (eObject instanceof View) {
eObject = ((View) eObject).getElement();
}
if (eObject != null) {
result.add(eObject);
}
}
return result;
}
/**
* Returns a DropObjectsRequest corresponding to the given request,
* or null is such an operation is not possible.
*
* @param request
* @return
*/
protected DropObjectsRequest getDropObjectsRequest(Request request) {
if (request instanceof DropObjectsRequest) {
return (DropObjectsRequest) request;
}
// Adapted from org.eclipse.gmf.runtime.diagram.ui.editpolicies.DragDropEditPolicy#castToDropObjectsRequest
if (request instanceof ChangeBoundsRequest) {
ChangeBoundsRequest changeBoundsRequest = (ChangeBoundsRequest) request;
Iterator<EditPart> editParts = ToolUtilities.getSelectionWithoutDependants(changeBoundsRequest.getEditParts()).iterator();
List<EObject> elements = new LinkedList<>();
while (editParts.hasNext()) {
EditPart editPart = editParts.next();
if (editPart instanceof IGraphicalEditPart) {
EObject element = ViewUtil.resolveSemanticElement((View) ((IGraphicalEditPart) editPart).getModel());
if (element != null) {
elements.add(element);
}
}
}
DropObjectsRequest req = new DropObjectsRequest();
req.setObjects(elements);
req.setAllowedDetail(DND.DROP_COPY | DND.DROP_MOVE | DND.DROP_LINK);
req.setLocation(changeBoundsRequest.getLocation());
req.setRequiredDetail(DND.DROP_COPY); // FIXME: Handle drop links (DND.DROP_LINK)
return req;
}
return null;
}
}
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