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+/* This file is part of the KDE libraries
+ Copyright (C) 2001 Christoph Cullmann <cullmann@kde.org>
+
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public
+ License version 2 as published by the Free Software Foundation.
+
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public License
+ along with this library; see the file COPYING.LIB. If not, write to
+ the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ Boston, MA 02110-1301, USA.
+*/
+
+#ifndef __tdetexteditor_undointerface_h__
+#define __tdetexteditor_undointerface_h__
+
+#include <tdelibs_export.h>
+
+class TQCString;
+
+namespace KTextEditor
+{
+
+/**
+* This is an interface to undo functionality of a Document.
+*/
+class KTEXTEDITOR_EXPORT UndoInterface
+{
+ friend class PrivateUndoInterface;
+
+ public:
+ UndoInterface ();
+ virtual ~UndoInterface ();
+
+ unsigned int undoInterfaceNumber () const;
+
+ protected:
+ void setUndoInterfaceDCOPSuffix (const TQCString &suffix);
+
+ //
+ // slots !!!
+ //
+ public:
+ virtual void undo () = 0;
+
+ virtual void redo () = 0;
+
+ virtual void clearUndo () = 0;
+
+ virtual void clearRedo () = 0;
+
+ virtual unsigned int undoCount () const = 0;
+
+ virtual unsigned int redoCount () const = 0;
+
+ /**
+ returns the maximum of undo steps possible, 0 means no limit !
+ */
+ virtual unsigned int undoSteps () const = 0;
+
+ virtual void setUndoSteps ( unsigned int steps ) = 0;
+
+ //
+ // signals !!!
+ //
+ public:
+ virtual void undoChanged () = 0;
+
+ private:
+ class PrivateUndoInterface *d;
+ static unsigned int globalUndoInterfaceNumber;
+ unsigned int myUndoInterfaceNumber;
+};
+
+KTEXTEDITOR_EXPORT UndoInterface *undoInterface (class Document *doc);
+
+}
+
+#endif