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diff --git a/umbrello/umbrello/linkwidget.h b/umbrello/umbrello/linkwidget.h
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+/***************************************************************************
+ *                                                                         *
+ *   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.                                   *
+ *                                                                         *
+ *   copyright (C) 2004-2006                                               *
+ *   Umbrello UML Modeller Authors <uml-devel@uml.sf.net>                  *
+ ***************************************************************************/
+
+#ifndef LINKWIDGET_H
+#define LINKWIDGET_H
+
+#include <qfont.h>
+
+#include "umlnamespace.h"
+
+// forward declarations
+class UMLClassifier;
+class UMLOperation;
+class FloatingTextWidget;
+class UMLView;
+
+/**
+ * This is an interface realized by AssociationWidget and MessageWidget.
+ * The design of this interface was driven by the requirements of
+ * class FloatingTextWidget.  As the architecture of Umbrello evolves (for
+ * example, if the class FloatingTextWidget is redesigned), it can be
+ * cleaned up.
+ *
+ * @short       Interface to FloatingTextWidget for AssociationWidget and MessageWidget.
+ * @author      Oliver Kellogg <okellogg@users.sourceforge.net>
+ * Bugs and comments to uml-devel@lists.sf.net or http://bugs.kde.org
+ */
+class LinkWidget {
+public:
+    LinkWidget();
+    virtual ~LinkWidget();
+
+    /**
+     * Sets the font the widget is to use.
+     * Abstract operation implemented by inheriting classes.
+     * Motivated by FloatingTextWidget::slotMenuSelection(mt_Operation)
+     *
+     * @param font              Font to be set.
+     */
+    virtual void lwSetFont(QFont font) = 0;
+
+    /**
+     * Motivated by FloatingTextWidget::slotMenuSelection(mt_Operation)
+     */
+    virtual UMLClassifier *getOperationOwner();
+
+    /**
+     * Motivated by FloatingTextWidget::slotMenuSelection(mt_Operation)
+     */
+    virtual UMLOperation *getOperation() = 0;
+
+    /**
+     * Motivated by FloatingTextWidget::slotMenuSelection(mt_Operation)
+     */
+    virtual void setOperation(UMLOperation *op) = 0;
+
+    /**
+     * Motivated by getOperationText()
+     */
+    virtual QString getCustomOpText() = 0;
+
+    /**
+     * Motivated by FloatingTextWidget::slotMenuSelection(mt_Operation)
+     */
+    virtual void setCustomOpText(const QString &opText) = 0;
+
+    /**
+     * Uses getOperation() if set, else calls getCustomOpText().
+     */
+    QString getOperationText(UMLView *view = NULL);
+
+    /**
+     * Motivated by FloatingTextWidget::slotMenuSelection(mt_Reset_Label_Positions)
+     * Only applies to AssociationWidget.
+     */
+    virtual void resetTextPositions();
+
+    /**
+     * Motivated by FloatingTextWidget::setMessageText()
+     */
+    virtual void setMessageText(FloatingTextWidget *ft) = 0;
+
+    /**
+     * Motivated by FloatingTextWidget::handleRename()
+     */
+    virtual void setText(FloatingTextWidget *ft, const QString &newText) = 0;
+
+    /**
+     * Motivated by FloatingTextWidget::mouseDoubleClickEvent()
+     * Only applies to AssociationWidget.
+     */
+    virtual bool showDialog();
+
+    /**
+     * Motivated by FloatingTextWidget::showOpDlg()
+     */
+    virtual UMLClassifier *getSeqNumAndOp(QString& seqNum, QString& op) = 0;
+
+    /**
+     * Motivated by FloatingTextWidget::showOpDlg()
+     */
+    virtual void setSeqNumAndOp(const QString &seqNum, const QString &op) = 0;
+
+    /**
+     * Abstract operation implemented by inheriting classes.
+     * Motivated by FloatingTextWidget::mouseMoveEvent()
+     */
+    virtual void constrainTextPos(int &textX, int &textY,
+                                  int textWidth, int textHeight,
+                                  Uml::Text_Role tr) = 0;
+
+    /**
+     * Motivated by FloatingTextWidget::setLink().
+     * Only applies to AssociationWidget.
+     */
+    virtual void calculateNameTextSegment();
+
+};
+
+#endif