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/*****************************************************************************
* Copyright (c) 2014 CEA LIST, 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:
* Gabriel Pascual (ALL4TEC) gabriel.pascual@all4tec.net - Initial API and implementation
* Christian W. Damus - bug 454536
*
*****************************************************************************/
package org.eclipse.papyrus.views.modelexplorer;
import java.util.Iterator;
import org.eclipse.core.commands.operations.IUndoContext;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.papyrus.infra.core.operation.DelegatingUndoContext;
import org.eclipse.papyrus.infra.core.services.ServiceException;
import org.eclipse.papyrus.infra.core.services.ServicesRegistry;
import org.eclipse.papyrus.infra.core.utils.AdapterUtils;
import org.eclipse.papyrus.infra.emf.utils.EMFHelper;
import org.eclipse.papyrus.infra.emf.utils.ServiceUtilsForEObject;
import org.eclipse.papyrus.views.modelexplorer.core.ui.pagebookview.MultiViewPageBookView;
import org.eclipse.papyrus.views.modelexplorer.core.ui.pagebookview.ViewPartPage;
import org.eclipse.ui.IActionBars;
import org.eclipse.ui.actions.ActionFactory;
import org.eclipse.ui.operations.RedoActionHandler;
import org.eclipse.ui.operations.UndoActionHandler;
import org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage;
import com.google.common.base.Predicate;
import com.google.common.base.Supplier;
import com.google.common.collect.Iterators;
/**
* Specific PropertySheetPage for Model Explorer view to contribute to Undo/Redo Edit menu.
*
* @author Gabriel Pascual
*
*/
class ModelExplorerPropertySheetPage extends TabbedPropertySheetPage implements IPageBookViewPageListener {
private final ModelExplorerPageBookView modelExplorer;
/** The undo. */
private UndoActionHandler undo = null;
/** The redo. */
private RedoActionHandler redo = null;
/** The undo context. */
private DelegatingUndoContext undoContext = null;
/**
* Constructor.
*
* @param modelExplorer
* the Model Explorer view that owns me
*/
public ModelExplorerPropertySheetPage(ModelExplorerPageBookView modelExplorer) {
super(modelExplorer);
this.modelExplorer = modelExplorer;
modelExplorer.addPageListener(this);
}
/**
* @see org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage#setActionBars(org.eclipse.ui.IActionBars)
*
* @param actionBars
*/
@Override
public void setActionBars(IActionBars actionBars) {
super.setActionBars(actionBars);
undoContext = new DelegatingUndoContext.Dynamic(new Supplier<IUndoContext>() {
public IUndoContext get() {
return AdapterUtils.adapt(modelExplorer, IUndoContext.class, null);
}
});
undo = new UndoActionHandler(getSite().getPage().getActivePart().getSite(), undoContext);
redo = new RedoActionHandler(getSite().getPage().getActivePart().getSite(), undoContext);
actionBars.setGlobalActionHandler(ActionFactory.UNDO.getId(), undo);
actionBars.setGlobalActionHandler(ActionFactory.REDO.getId(), redo);
}
/**
* @see org.eclipse.ui.views.properties.tabbed.TabbedPropertySheetPage#dispose()
*
*/
@Override
public void dispose() {
modelExplorer.removePageListener(this);
if (undo != null) {
undo.dispose();
}
if (redo != null) {
redo.dispose();
}
super.dispose();
}
public void pageActivated(MultiViewPageBookView pageBookView, ViewPartPage page) {
// Ensure that I am showing the up-to-date selection
selectionChanged(modelExplorer, pageBookView.getSite().getSelectionProvider().getSelection());
}
public void pageClosing(MultiViewPageBookView pageBookView, ViewPartPage page) {
if (isSelectionUnloading((ServicesRegistry) page.getAdapter(ServicesRegistry.class))) {
// Forget the selection because it is now invalid and we don't want to show it when next the Model Explorer is activated
selectionChanged(modelExplorer, StructuredSelection.EMPTY);
}
}
/**
* Queries whether the current selection includes any element from a resource in the context of the specified {@code context} that is being unloaded.
*
* @param context
* the service registry context of an editor that is being unloaded
* @return whether any currently presented input element has already been unloaded (is now a proxy) or is in the given {@code context}
*/
private boolean isSelectionUnloading(final ServicesRegistry context) {
boolean result = false;
ISelection currentSelection = getCurrentSelection();
if (currentSelection instanceof IStructuredSelection) {
IStructuredSelection selection = (IStructuredSelection) currentSelection;
result = Iterators.any((Iterator<?>) selection.iterator(), new Predicate<Object>() {
public boolean apply(Object input) {
try {
EObject eObject = EMFHelper.getEObject(input);
return (eObject != null) && (eObject.eIsProxy() || (ServiceUtilsForEObject.getInstance().getServiceRegistry(eObject) == context));
} catch (ServiceException e) {
// We won't try to get the registry for an element that is already unloaded (short-circuit 'or')
return false;
}
}
});
}
return result;
}
}
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