--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwtx/text/undo/IDocumentUndoManager.d	Sat Aug 23 19:10:48 2008 +0200
@@ -0,0 +1,174 @@
+/*******************************************************************************
+ * Copyright (c) 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.text.undo.IDocumentUndoManager;
+
+import dwt.dwthelper.utils;
+
+import dwtx.core.commands.ExecutionException;
+import dwtx.core.commands.operations.IUndoContext;
+
+/**
+ * Interface for a document undo manager. Tracks changes in a document and
+ * builds a history of text commands that describe the undoable changes to the
+ * document.
+ * <p>
+ * Clients must explicitly connect to the undo manager to express their interest
+ * in the undo history. Clients should disconnect from the undo manager when
+ * they are no longer interested in tracking the undo history. If there are no
+ * clients connected to the undo manager, it will not track the document's
+ * changes and will dispose of any history that was previously kept.</p>
+ * <p>
+ * Clients may also listen to the undo manager for notifications before and
+ * after undo or redo events are performed. Clients must connect to the undo
+ * manager in addition to registering listeners.</p>
+ * <p>
+ * Clients may implement this interface.
+ * </p>
+ * 
+ * @see DocumentUndoManagerRegistry
+ * @see IDocumentUndoListener
+ * @see dwtx.jface.text.IDocument
+ * @since 3.2
+ */
+public interface IDocumentUndoManager {
+
+    /**
+     * Adds the specified listener to the list of document undo listeners that
+     * are notified before and after changes are undone or redone in the
+     * document. This method has no effect if the instance being added is
+     * already in the list.
+     * <p>
+     * Notifications will not be received if there are no clients connected to
+     * the receiver. Registering a document undo listener does not implicitly
+     * connect the listener to the receiver.</p>
+     * <p>
+     * Document undo listeners must be prepared to receive notifications from a
+     * background thread. Any UI access occurring inside the implementation must
+     * be properly synchronized using the techniques specified by the client's
+     * widget library.</p>
+     * 
+     * @param listener the document undo listener to be added as a listener
+     */
+    void addDocumentUndoListener(IDocumentUndoListener listener);
+
+    /**
+     * Removes the specified listener from the list of document undo listeners.
+     * <p>
+     * Removing a listener which is not registered has no effect
+     * </p>
+     * 
+     * @param listener the document undo listener to be removed
+     */
+    void removeDocumentUndoListener(IDocumentUndoListener listener);
+
+    /**
+     * Returns the undo context registered for this document
+     * 
+     * @return the undo context registered for this document
+     */
+    IUndoContext getUndoContext();
+
+    /**
+     * Closes the currently open text edit and open a new one.
+     */
+    void commit();
+
+    /**
+     * Connects to the undo manager. Used to signify that a client is monitoring
+     * the history kept by the undo manager. This message has no effect if the
+     * client is already connected.
+     * 
+     * @param client the object connecting to the undo manager
+     */
+    void connect(Object client);
+
+    /**
+     * Disconnects from the undo manager. Used to signify that a client is no
+     * longer monitoring the history kept by the undo manager. If all clients
+     * have disconnected from the undo manager, the undo history will be
+     * deleted.
+     * 
+     * @param client the object disconnecting from the undo manager
+     */
+    void disconnect(Object client);
+
+    /**
+     * 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();
+
+    /**
+     * Sets the limit of the undo history to the specified value. The provided
+     * limit will supersede any previously set limit.
+     * 
+     * @param undoLimit the length of this undo manager's history
+     */
+    void setMaximalUndoLevel(int undoLimit);
+    
+    /**
+     * Resets the history of the undo manager. After that call,
+     * there aren't any undo-able or redo-able text changes.
+     */
+    void reset();
+
+    /**
+     * 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.
+     * 
+     * @throws ExecutionException if an exception occurred during undo
+     */
+    void undo() throws ExecutionException;
+
+    /**
+     * Repeats the most recently rolled back text change.
+     * 
+     * @throws ExecutionException if an exception occurred during redo
+     */
+    void redo() throws ExecutionException;
+
+    /**
+     * Transfers the undo history from the specified document undo manager to
+     * this undo manager.  This message should only be used when it is known 
+     * that the content of the document of the original undo manager when the
+     * last undo operation was recorded is the same as this undo manager's 
+     * current document content, since the undo history is based on document
+     * indexes.  It is the responsibility of the caller 
+     * to ensure that this call is used correctly.  
+     * 
+     * @param manager the document undo manger whose history is to be transferred to the receiver
+     */
+    public void transferUndoHistory(IDocumentUndoManager manager);
+
+}