--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/jface/text/IUndoManager.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,108 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2006 IBM Corporation 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:
+ *     IBM Corporation - initial API and implementation
+ * Port to the D programming language:
+ *     Frank Benoit <benoit@tionex.de>
+ *******************************************************************************/
+module dwtx.jface.text.IUndoManager;
+
+import dwt.dwthelper.utils;
+
+/**
+ * An undo manager is connected to at most one
+ * {@link dwtx.jface.text.ITextViewer}.
+ * <p>
+ * It monitors the text viewer and keeps a history of the changes applied to the
+ * viewer. The undo manager groups those changes into user interactions which on
+ * an undo request are rolled back in one atomic change.</p>
+ * <p>
+ * In order to provide backward compatibility for clients of
+ * <code>IUndoManager</code>, extension interfaces are used as a means of
+ * evolution. The following extension interfaces exist:
+ * <ul>
+ * <li>{@link dwtx.jface.text.IUndoManagerExtension} since version 3.1
+ * introducing access to the undo context.</li>
+ * </ul></p>
+ * <p>
+ * Clients may implement this interface or use the standard implementation
+ * <code>TextViewerUndoManager</code>.
+ * </p>
+ *
+ * @see TextViewerUndoManager
+ * @see IUndoManagerExtension
+ */
+public interface IUndoManager {
+
+    /**
+     * Connects this undo manager to the given text viewer.
+     *
+     * @param viewer the viewer the undo manager is connected to
+     */
+    void connect(ITextViewer viewer);
+
+    /**
+     * Disconnects this undo manager from its text viewer.
+     * If this undo manager hasn't been connected before this
+     * operation has no effect.
+     */
+    void disconnect();
+
+    /**
+     * Signals the undo manager that all subsequent changes until
+     * <code>endCompoundChange</code> is called are to be undone in one piece.
+     */
+    void beginCompoundChange();
+
+    /**
+     * Signals the undo manager that the sequence of changes which started with
+     * <code>beginCompoundChange</code> has been finished. All subsequent changes
+     * are considered to be individually undo-able.
+     */
+    void endCompoundChange();
+
+    /**
+     * Resets the history of the undo manager. After that call,
+     * there aren't any undo-able or redo-able text changes.
+     */
+    void reset();
+
+    /**
+     * The given parameter determines the maximal length of the history
+     * remembered by the undo manager.
+     *
+     * @param undoLevel the length of this undo manager's history
+     */
+    void setMaximalUndoLevel(int undoLevel);
+
+    /**
+     * Returns whether at least one text change can be rolled back.
+     *
+     * @return <code>true</code> if at least one text change can be rolled back
+     */
+    bool undoable();
+
+    /**
+     * Returns whether at least one text change can be repeated. A text change
+     * can be repeated only if it was executed and rolled back.
+     *
+     * @return <code>true</code> if at least on text change can be repeated
+     */
+    bool redoable();
+
+    /**
+     * Rolls back the most recently executed text change.
+     */
+    void undo();
+
+    /**
+     * Repeats the most recently rolled back text change.
+     */
+    void redo();
+
+}