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/*******************************************************************************
* Copyright (c) 2011 THALES GLOBAL SERVICES.
* 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:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.sirius.diagram.tools.internal.delete;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.emf.edit.domain.IEditingDomainProvider;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.common.ui.action.global.GlobalActionId;
import org.eclipse.gmf.runtime.common.ui.services.action.global.IGlobalActionContext;
import org.eclipse.gmf.runtime.common.ui.services.action.global.IGlobalActionHandler;
import org.eclipse.gmf.runtime.diagram.ui.editparts.IGraphicalEditPart;
import org.eclipse.gmf.runtime.diagram.ui.parts.IDiagramWorkbenchPart;
import org.eclipse.gmf.runtime.diagram.ui.providers.DiagramGlobalActionHandler;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.sirius.DSemanticDecorator;
/**
* A {@link IGlobalActionHandler} to manage the delete action.
*
* @author <a href="mailto:esteban.dugueperoux@obeo.fr">Esteban Dugueperoux</a>
*/
public class SiriusDeleteGlobalActionHandler extends DiagramGlobalActionHandler implements IGlobalActionHandler {
/**
* Overridden to tells that we handle only delete action.
*
* {@inheritDoc}
*/
@Override
public boolean canHandle(IGlobalActionContext cntxt) {
boolean canHandle = false;
/* Check if the active part is a IDiagramWorkbenchPart */
/* Check if the selection is a structured selection */
IWorkbenchPart part = cntxt.getActivePart();
if (part instanceof IDiagramWorkbenchPart && cntxt.getSelection() instanceof IStructuredSelection) {
/* Check the action id */
String actionId = cntxt.getActionId();
if (GlobalActionId.DELETE.equals(actionId)) {
canHandle = getCommand(cntxt) != null;
}
}
return canHandle;
}
@Override
public ICommand getCommand(IGlobalActionContext cntxt) {
ICommand deleteCommand = super.getCommand(cntxt);
if (deleteCommand != null && deleteCommand.canExecute()) {
TransactionalEditingDomain domain = getEditingDomain(cntxt);
deleteCommand = new DeleteWrapperHookExecutorCommand(domain, computeSelections(cntxt), deleteCommand);
}
return deleteCommand;
}
private TransactionalEditingDomain getEditingDomain(IGlobalActionContext cntxt) {
IWorkbenchPart part = cntxt.getActivePart();
TransactionalEditingDomain result = null;
IEditingDomainProvider provider = (IEditingDomainProvider) part.getAdapter(IEditingDomainProvider.class);
if (provider != null) {
EditingDomain domain = provider.getEditingDomain();
if (domain instanceof TransactionalEditingDomain) {
result = (TransactionalEditingDomain) domain;
}
}
return result;
}
private Collection<DSemanticDecorator> computeSelections(IGlobalActionContext globalActionContext) {
final Collection<DSemanticDecorator> diagramElements = new ArrayList<DSemanticDecorator>();
ISelection selection = globalActionContext.getSelection();
if (selection instanceof IStructuredSelection) {
IStructuredSelection structuredSelection = (IStructuredSelection) selection;
Iterator<?> iterator = structuredSelection.iterator();
while (iterator.hasNext()) {
Object selectedObject = iterator.next();
if (selectedObject instanceof IGraphicalEditPart) {
final IGraphicalEditPart gEditPart = (IGraphicalEditPart) selectedObject;
final EObject element = gEditPart.resolveSemanticElement();
if (element instanceof DSemanticDecorator) {
diagramElements.add((DSemanticDecorator) element);
}
}
}
}
return diagramElements;
}
}
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