| /******************************************************************************* |
| * Copyright (c) 2010 BestSolution.at 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: |
| * Tom Schindl <tom.schindl@bestsolution.at> - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.e4.tools.emf.editor3x; |
| |
| import java.util.Collection; |
| |
| import org.eclipse.e4.tools.emf.ui.common.IModelResource; |
| import org.eclipse.e4.ui.model.application.ui.MUILabel; |
| import org.eclipse.emf.common.command.Command; |
| import org.eclipse.emf.ecore.EObject; |
| import org.eclipse.emf.edit.command.AddCommand; |
| import org.eclipse.emf.edit.command.DeleteCommand; |
| import org.eclipse.emf.edit.command.SetCommand; |
| import org.eclipse.jface.action.Action; |
| |
| public class UndoAction extends Action { |
| private final IModelResource resource; |
| private final IModelResource.ModelListener listener; |
| |
| public UndoAction(IModelResource resource) { |
| this.resource = resource; |
| listener = new IModelResource.ModelListener() { |
| |
| @Override |
| public void commandStackChanged() { |
| update(); |
| } |
| |
| @Override |
| public void dirtyChanged() { |
| } |
| }; |
| resource.addModelListener(listener); |
| update(); |
| } |
| |
| @Override |
| public void run() { |
| if (resource.getEditingDomain().getCommandStack().canUndo()) { |
| resource.getEditingDomain().getCommandStack().undo(); |
| } |
| } |
| |
| private void update() { |
| if (resource.getEditingDomain().getCommandStack().canUndo()) { |
| Command undoCommand = resource.getEditingDomain().getCommandStack() |
| .getUndoCommand(); |
| String label = getCommandLabel(undoCommand); |
| setText(Messages.UndoAction_Undo + " " //$NON-NLS-1$ |
| + label); |
| setEnabled(true); |
| } else { |
| setText(Messages.UndoAction_Undo); |
| setEnabled(false); |
| } |
| } |
| |
| /** |
| * Compute a command label depending on the command for undo/redo label. |
| * |
| * For instance : Add Trimmedwindow or Delete 5 objects |
| * |
| * @param cmd |
| * @return a description string for the command |
| */ |
| public static String getCommandLabel(Command cmd) { |
| |
| if (cmd instanceof SetCommand) { |
| SetCommand sc = (SetCommand) cmd; |
| return sc.getLabel() + " " + sc.getFeature().getName() + " on " + sc.getOwner().eClass().getName(); //$NON-NLS-1$ //$NON-NLS-2$ |
| } else if (cmd instanceof AddCommand) { |
| AddCommand ac = (AddCommand) cmd; |
| return ac.getLabel() + " " + getFirstClassName(ac.getCollection()); //$NON-NLS-1$ |
| } else if (cmd instanceof DeleteCommand) { |
| DeleteCommand dc = (DeleteCommand) cmd; |
| Collection<?> deleted = dc.getCollection(); |
| if (deleted.size() == 1) { |
| return dc.getLabel() + " " + getFirstClassName(deleted); //$NON-NLS-1$ |
| } |
| return dc.getLabel() + " " + dc.getCollection().size() + " Objects"; //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| return cmd.getLabel(); |
| } |
| |
| /** |
| * Get the eClassname or empty string of the first element in the collection |
| * |
| * @param c |
| * @return name of classname if object is an EObject else an empty string |
| */ |
| private static String getFirstClassName(Collection<?> c) |
| { |
| Object o = c.iterator().next(); |
| String clname = (o instanceof EObject) ? ((EObject) o).eClass().getName() : ""; //$NON-NLS-1$ |
| String dname = (o instanceof MUILabel) ? ((MUILabel) o).getLabel() : ""; //$NON-NLS-1$ |
| return clname + " " + (dname == null ? "" : dname); //$NON-NLS-1$ //$NON-NLS-2$ |
| } |
| |
| /** |
| * Clean up |
| */ |
| public void dispose() { |
| resource.removeModelListener(listener); |
| } |
| } |