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diff --git a/kpovmodeler/pmcommand.h b/kpovmodeler/pmcommand.h
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+//-*-C++-*-
+/*
+**************************************************************************
+                                 description
+                             --------------------
+    copyright            : (C) 2000-2001 by Andreas Zehender
+    email                : [email protected]
+**************************************************************************
+
+**************************************************************************
+*                                                                        *
+*  This program is free software; you can redistribute it and/or modify  *
+*  it under the terms of the GNU General Public License as published by  *
+*  the Free Software Foundation; either version 2 of the License, or     *
+*  (at your option) any later version.                                   *
+*                                                                        *
+**************************************************************************/
+
+
+#ifndef PMCOMMAND_H
+#define PMCOMMAND_H
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <qstring.h>
+#include <qptrlist.h>
+
+#include "pmmessage.h"
+#include "pmerrorflags.h"
+
+class PMCommandManager;
+class PMObject;
+class PMPart;
+
+/**
+ * Constants for object changes
+ *
+ * PMCAdd: An object was added
+ *
+ * PMCRemove: An object was removed. A signal with this constant has
+ * to be emitted _before_ the object is removed.
+ *
+ * PMCChildren: Some children are added or removed. Do not use. Use PMCAdd and
+ * PMCRemove for all childrens.
+ *
+ * PMCData: Data (for dialog views) is changed
+ *
+ * PMCDescription: The name or pixmap of the object has changed. Always
+ * together with PMCData.
+ *
+ * PMCViewStructure: The rendering has changed
+ *
+ * PMCNewSelection: The object was selected and all other deleselected.
+ * If the changed object is 0, all objects are deselected!
+ *
+ * PMCSelected: The object was selected.
+ *
+ * PMCDeselected: The object was deselected.
+ *
+ * PMCNewControlPoints: The list of control points has changed.
+ *
+ * PMCControlPointSelection: The control point selection has changed.
+ *
+ * PMCInsertError: The added object couldn't be inserted and was appended
+ * to the insert errors. Always together with PMCAdd.
+ *
+ * PMCNothing: Nothing was changed
+ */
+enum PMChange
+{
+   PMCNothing = 0, PMCAdd = 1, PMCRemove = 2, PMCChildren = 4,
+   PMCData = 8, PMCDescription = 16, PMCViewStructure = 32,
+   PMCGraphicalChange = 64,
+   PMCNewSelection = 128, PMCSelected = 256,
+   PMCDeselected = 512,
+   PMCNewControlPoints = 1024, PMCControlPointSelection = 2048,
+   PMCInsertError = 4096
+};
+
+/**
+ * Base class for all commands, that support undo/redo.
+ */
+class PMCommand
+{
+   friend class PMCommandManager; // only PMCommandManager can execute commands
+public:
+   /**
+    * Creates an empty command object.
+    */
+   PMCommand( ) { }
+   /**
+    * Creates a command with command text text
+    */
+   PMCommand( const QString &text )
+   { m_text = text; }
+   /**
+    * Deletes the command.
+    */
+   virtual ~PMCommand( ) { }
+
+   /**
+    * Command text shown in the undo/redo menues
+    */
+   QString text( ) const { return m_text; }
+   /**
+    * Sets the command text
+    */
+   void setText( const QString& s ) { m_text = s; }
+
+   /**
+    * Checks if the command is valid and sets the error message
+    *
+    * Returns a bitwise combination of @ref PMErrorFlags flags
+    */
+   virtual int errorFlags( PMPart* ) { return PMENone; }
+   /**
+    * Returns the error message
+    */
+   PMMessageList messages( ) { return m_errors; }
+
+protected:
+   /**
+    * Executes the command and stores undo information.
+    */
+   virtual void execute( PMCommandManager* theManager ) = 0;
+   /**
+    * Undoes the command
+    */
+   virtual void undo( PMCommandManager* theManager ) = 0;
+   /**
+    * The error messages
+    */
+   PMMessageList m_errors;
+
+private:
+   /**
+    * The command text.
+    */
+   QString m_text;
+};
+
+typedef QPtrList<PMCommand> PMCommandList;
+
+#endif