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/*****************************************************************************
* Copyright (c) 2015 Christian W. Damus 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:
* Christian W. Damus - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.infra.gmfdiag.css.properties.dnd;
import java.util.Collections;
import java.util.List;
import org.eclipse.core.resources.IFile;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.CompoundCommand;
import org.eclipse.gmf.runtime.notation.EObjectListValueStyle;
import org.eclipse.gmf.runtime.notation.NotationPackage;
import org.eclipse.gmf.runtime.notation.View;
import org.eclipse.jface.util.LocalSelectionTransfer;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.papyrus.commands.wrappers.EMFtoGEFCommandWrapper;
import org.eclipse.papyrus.infra.core.utils.AdapterUtils;
import org.eclipse.papyrus.infra.gmfdiag.common.helper.NotationHelper;
import org.eclipse.papyrus.infra.gmfdiag.css.notation.CSSStyles;
import org.eclipse.papyrus.infra.gmfdiag.css.properties.Activator;
import org.eclipse.papyrus.infra.gmfdiag.css.properties.databinding.AddCSSStyleSheetCommand;
import org.eclipse.papyrus.infra.gmfdiag.css.stylesheets.StyleSheetReference;
import org.eclipse.papyrus.infra.gmfdiag.css.stylesheets.StylesheetsFactory;
import org.eclipse.papyrus.infra.gmfdiag.dnd.strategy.TransactionalDropStrategy;
import org.eclipse.swt.graphics.Image;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
/**
* Strategy for dropping CSS resources onto a diagram to add a stylesheet reference.
*/
public class StyleSheetDropStrategy extends TransactionalDropStrategy {
public static final String ID = Activator.PLUGIN_ID + ".drop"; //$NON-NLS-1$
public StyleSheetDropStrategy() {
super();
}
public String getLabel() {
return "Add Stylesheet Reference";
}
public String getDescription() {
return "Adds a stylesheet to the diagram by reference to the dropped CSS resource";
}
public Image getImage() {
return null;
}
public String getID() {
return ID;
}
public int getPriority() {
return 0;
}
@Override
protected Command doGetCommand(Request request, EditPart targetEditPart) {
Command result = null;
// Only diagram supports stylesheet reference
View targetView = NotationHelper.findView(targetEditPart);
targetView = (targetView != null) ? targetView.getDiagram() : targetView;
if (targetView != null) {
// The DropObjectsRequest has only EObjects if it contains anything, so go directly to the source
List<?> objects;
ISelection selection = LocalSelectionTransfer.getTransfer().getSelection();
if (selection instanceof IStructuredSelection) {
objects = ((IStructuredSelection) selection).toList();
} else {
objects = Collections.emptyList();
}
EObjectListValueStyle existingReferences = (EObjectListValueStyle) targetView.getNamedStyle(NotationPackage.Literals.EOBJECT_LIST_VALUE_STYLE, CSSStyles.CSS_DIAGRAM_STYLESHEETS_KEY);
List<String> cssPaths = Lists.newArrayListWithCapacity(objects.size());
for (Object next : objects) {
IFile file = AdapterUtils.adapt(next, IFile.class, null);
if ((file != null) && "css".equals(file.getFileExtension())) {
// Maybe we have this one already?
final String path = file.getFullPath().toString();
boolean found = false;
if (existingReferences != null) {
for (StyleSheetReference ref : Iterables.filter(existingReferences.getEObjectListValue(), StyleSheetReference.class)) {
if (path.equals(ref.getPath())) {
found = true;
break;
}
}
}
if (!found) {
cssPaths.add(path);
}
} else {
// All-or-nothing drop
cssPaths.clear();
break;
}
}
if (!cssPaths.isEmpty()) {
CompoundCommand compound = new CompoundCommand(getLabel());
TransactionalEditingDomain domain = getTransactionalEditingDomain(targetEditPart);
for (String next : cssPaths) {
StyleSheetReference ref = StylesheetsFactory.eINSTANCE.createStyleSheetReference();
ref.setPath(next);
AddCSSStyleSheetCommand command = new AddCSSStyleSheetCommand(domain, targetView,
CSSStyles.CSS_DIAGRAM_STYLESHEETS_KEY,
NotationPackage.Literals.EOBJECT_LIST_VALUE_STYLE, NotationPackage.Literals.EOBJECT_LIST_VALUE_STYLE__EOBJECT_LIST_VALUE,
ref);
compound.add(EMFtoGEFCommandWrapper.wrap(command));
}
result = compound.unwrap();
}
}
return result;
}
}
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