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/*****************************************************************************
* Copyright (c) 2011, 2016 CEA LIST, Esterel Technologies SAS 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:
* CEA LIST - Initial API and implementation
* Alain Le Guennec (Esterel Technologies SAS) - bug 497400
*
*****************************************************************************/
package org.eclipse.papyrus.sysml.diagram.internalblock.edit.policy;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.emf.transaction.RunnableWithResult;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.UnexecutableCommand;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.diagram.ui.commands.ICommandProxy;
import org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart;
import org.eclipse.gmf.runtime.diagram.ui.requests.DropObjectsRequest;
import org.eclipse.papyrus.infra.gmfdiag.common.commands.SelectAndExecuteCommand;
import org.eclipse.papyrus.sysml.diagram.internalblock.utils.TypeDropHelper;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.PlatformUI;
/**
* <pre>
* Customization of the DND edit policy for TypedElement (Port, Part, Reference, FlowPort), that enables
* type modification by a drop on target.
* </pre>
*/
public class TypedElementDropEditPolicy extends CustomDragDropEditPolicy {
/** Default constructor */
public TypedElementDropEditPolicy() {
super();
}
/**
* {@inheritedDoc}.
*/
@Override
public Command getDropObjectsCommand(DropObjectsRequest dropRequest) {
TypeDropHelper helper = new TypeDropHelper(getEditingDomain());
// Single drop management possible drop action list can be proposed
if (dropRequest.getObjects().size() == 1) {
// List of available drop commands
final List<Command> commandChoice = new ArrayList<Command>();
// 1. Try to set the target element type with dropped object
Command dropAsSetType = helper.getDropAsTypedElementType(dropRequest, (GraphicalEditPart) getHost());
if ((dropAsSetType != null) && (dropAsSetType.canExecute())) {
commandChoice.add(dropAsSetType);
}
// 3. Build default drop command (show view of the dropped object)
Command defaultDropCommand = super.getDropObjectsCommand(dropRequest);
if ((defaultDropCommand != null) && (defaultDropCommand.canExecute())) {
defaultDropCommand.setLabel("Default drop (Show dropped object in diagram)");
commandChoice.add(defaultDropCommand);
}
// Prepare the selection command (if several command are available) or return the drop command
if (commandChoice.size() > 1) {
RunnableWithResult<ICommand> runnable;
Display.getDefault().syncExec(runnable = new RunnableWithResult.Impl<ICommand>() {
public void run() {
setResult(new SelectAndExecuteCommand("Select drop action for ", PlatformUI.getWorkbench().getActiveWorkbenchWindow().getShell(), commandChoice));
}
});
ICommand selectCommand = runnable.getResult();
return new ICommandProxy(selectCommand);
} else if (commandChoice.size() == 1) {
return commandChoice.get(0);
}
// else (command choice is empty)
return UnexecutableCommand.INSTANCE;
}
return super.getDropObjectsCommand(dropRequest);
}
}
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