Source Code Cross Referenced for UndoActionHandler.java in  » IDE-Eclipse » ui-workbench » org » eclipse » ui » operations » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » IDE Eclipse » ui workbench » org.eclipse.ui.operations 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


01:        /*******************************************************************************
02:         * Copyright (c) 2005, 2006 IBM Corporation and others.
03:         * All rights reserved. This program and the accompanying materials
04:         * are made available under the terms of the Eclipse Public License v1.0
05:         * which accompanies this distribution, and is available at
06:         * http://www.eclipse.org/legal/epl-v10.html
07:         *
08:         * Contributors:
09:         *     IBM Corporation - initial API and implementation
10:         *******************************************************************************/package org.eclipse.ui.operations;
11:
12:        import org.eclipse.core.commands.ExecutionException;
13:        import org.eclipse.core.commands.operations.IUndoContext;
14:        import org.eclipse.core.commands.operations.IUndoableOperation;
15:        import org.eclipse.core.runtime.IProgressMonitor;
16:        import org.eclipse.core.runtime.IStatus;
17:        import org.eclipse.ui.ISharedImages;
18:        import org.eclipse.ui.IWorkbenchPartSite;
19:        import org.eclipse.ui.PlatformUI;
20:        import org.eclipse.ui.internal.WorkbenchMessages;
21:
22:        /**
23:         * <p>
24:         * UndoActionHandler provides common behavior for performing an undo, as
25:         * well as labelling and enabling the undo menu item.  This class may be
26:         * instantiated by clients.
27:         * </p>
28:         * 
29:         * @since 3.1
30:         */
31:        public final class UndoActionHandler extends
32:                OperationHistoryActionHandler {
33:
34:            /**
35:             * Construct an action handler that handles the labelling and enabling of
36:             * the undo 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 the undo
42:             */
43:            public UndoActionHandler(IWorkbenchPartSite site,
44:                    IUndoContext context) {
45:                super (site, context);
46:                setImageDescriptor(PlatformUI.getWorkbench().getSharedImages()
47:                        .getImageDescriptor(ISharedImages.IMG_TOOL_UNDO));
48:                setDisabledImageDescriptor(PlatformUI.getWorkbench()
49:                        .getSharedImages().getImageDescriptor(
50:                                ISharedImages.IMG_TOOL_UNDO_DISABLED));
51:            }
52:
53:            void flush() {
54:                getHistory().dispose(getUndoContext(), true, false, false);
55:            }
56:
57:            String getCommandString() {
58:                return WorkbenchMessages.Operations_undoCommand;
59:            }
60:
61:            String getTooltipString() {
62:                return WorkbenchMessages.Operations_undoTooltipCommand;
63:            }
64:
65:            String getSimpleCommandString() {
66:                return WorkbenchMessages.Workbench_undo;
67:            }
68:
69:            String getSimpleTooltipString() {
70:                return WorkbenchMessages.Workbench_undoToolTip;
71:            }
72:
73:            IUndoableOperation getOperation() {
74:                return getHistory().getUndoOperation(getUndoContext());
75:
76:            }
77:
78:            IStatus runCommand(IProgressMonitor pm) throws ExecutionException {
79:                return getHistory().undo(getUndoContext(), pm, this );
80:            }
81:
82:            boolean shouldBeEnabled() {
83:                return getHistory().canUndo(getUndoContext());
84:            }
85:        }
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