RedoActionHandler


1   /*******************************************************************************
2    * Copyright (c) 2005, 2006 IBM Corporation and others.
3    * All rights reserved. This program and the accompanying materials
4    * are made available under the terms of the Eclipse Public License v1.0
5    * which accompanies this distribution, and is available at
6    * http://www.eclipse.org/legal/epl-v10.html
7    *
8    * Contributors:
9    *     IBM Corporation - initial API and implementation
10   *******************************************************************************/
11  package org.eclipse.ui.operations;
12  
13  import org.eclipse.core.commands.ExecutionException;
14  import org.eclipse.core.commands.operations.IUndoContext;
15  import org.eclipse.core.commands.operations.IUndoableOperation;
16  import org.eclipse.core.runtime.IProgressMonitor;
17  import org.eclipse.core.runtime.IStatus;
18  import org.eclipse.ui.ISharedImages;
19  import org.eclipse.ui.IWorkbenchPartSite;
20  import org.eclipse.ui.PlatformUI;
21  import org.eclipse.ui.internal.WorkbenchMessages;
22  
23  /**
24   * <p>
25   * RedoActionHandler provides common behavior for redoing an operation, as well
26   * as labelling and enabling the menu item.  This class may be instantiated by 
27   * clients.
28   * </p>
29   * 
30   * @since 3.1
31   */
32  public final class RedoActionHandler extends OperationHistoryActionHandler {
33  
34      /**
35       * Construct an action handler that handles the labelling and enabling of
36       * the redo action for the specified undo context.
37       * 
38       * @param site 
39       *            the workbench part site that created the action.
40       * @param context 
41       *            the undo context to be used for redoing.
42       */
43      public RedoActionHandler(IWorkbenchPartSite site, IUndoContext context) {
44          super(site, context);
45          setImageDescriptor(PlatformUI.getWorkbench().getSharedImages()
46                  .getImageDescriptor(ISharedImages.IMG_TOOL_REDO));
47          setDisabledImageDescriptor(PlatformUI.getWorkbench().getSharedImages()
48                  .getImageDescriptor(ISharedImages.IMG_TOOL_REDO_DISABLED));
49      }
50  
51      void flush() {
52          getHistory().dispose(getUndoContext(), false, true, false);
53      }
54  
55      String   getCommandString() {
56          return WorkbenchMessages.Operations_redoCommand;
57      }
58      
59      String   getTooltipString() {
60          return WorkbenchMessages.Operations_redoTooltipCommand;
61      }
62      
63      String   getSimpleCommandString() {
64          return WorkbenchMessages.Workbench_redo;
65      }
66      
67      String   getSimpleTooltipString() {
68          return WorkbenchMessages.Workbench_redoToolTip;
69      }
70  
71  
72      IUndoableOperation getOperation() {
73          return getHistory().getRedoOperation(getUndoContext());
74      }
75  
76      IStatus runCommand(IProgressMonitor pm) throws ExecutionException {
77          return getHistory().redo(getUndoContext(), pm, this);
78      }
79  
80      boolean shouldBeEnabled() {
81          return getHistory().canRedo(getUndoContext());
82      }
83  }
84
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