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diff --git a/lib/interfaces/external/designer.h b/lib/interfaces/external/designer.h
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+/* This file is part of the KDE project
+   Copyright (C) 2004 Alexander Dymo <[email protected]>
+
+   This library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public
+   License as published by the Free Software Foundation; either
+   version 2 of the License, or (at your option) any later version.
+
+   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., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.
+*/
+#ifndef KINTERFACEDESIGNER_FORMEDITOR_H
+#define KINTERFACEDESIGNER_FORMEDITOR_H
+
+#include <kparts/part.h>
+
+/**Contains KInterfaceDesigner classes.*/
+namespace KInterfaceDesigner{
+
+/**The type of a GUI Designer.*/
+enum DesignerType {
+    QtDesigner    /**<Qt Designer.*/,
+    Glade         /**<Glade (version >= 3).*/
+};
+
+/**Function type.*/
+enum FunctionType {
+    ftFunction    /**<Simple function or a callback.*/,
+    ftQtSlot      /**<Qt slot.*/
+};
+
+/**Function.*/
+struct Function{
+    /**Return type.*/
+    QString returnType;
+    /**Function name.*/
+    QString function;
+    /**Specifier, e.g. virtual, static, etc.*/
+    QString specifier;
+    /**Access, e.g. private, protected, public, etc.*/
+    QString access;
+    /**Function type.*/
+    FunctionType type;
+};
+
+/**
+GUI Designer Part Interface.
+Each KPart that wants to act as a GUI Designer must implement this interface.
+It defines necessary signals to communicate with an IDE and abstract virtual
+functions to determine designer type.
+
+Parts that implement this interface must emit its signals when necessary.
+See signals documentation for an explanation on when to emit those.
+
+If a part which can "design" user interface files of a certain mimetype
+implements this interface and sets itself as a default handler for that 
+mimetype then it becomes automatically integrated into KDevelop IDE.
+*/
+class Designer: public KParts::ReadWritePart{
+    Q_OBJECT
+public:
+    Designer(QObject *parent, const char *name);
+    
+    /**Reimplement this to be able to open projects.*/
+    virtual void openProject(const QString &projectFile) = 0;
+    /**Reimplement this return the type of this designer.*/
+    virtual DesignerType designerType() = 0;
+
+signals:
+    /**Emit this signal when a function was added by a designer. For example, when a slot 
+    or a callback function was defined.*/
+    void addedFunction(DesignerType type, const QString &formName, Function function);
+    /**Emit this signal when a function was removed by a designer.*/
+    void removedFunction(DesignerType type, const QString &formName, Function function);
+    /**Emit this signal when a function signature was edited by a designer.*/
+    void editedFunction(DesignerType type, const QString &formName, Function oldFunction, Function function);
+    
+    /**Emit this signal when a designer wants to open the editor with function definition.*/
+    void editFunction(DesignerType type, const QString &formName, const QString &functionName);
+    /**Emit this signal when a designer wants to open the editor for a form sources.*/
+    void editSource(DesignerType type, const QString &formName);
+    
+    /**Emitted when a form state is changed in the designer.
+    @param formName An absolute name of the form file.
+    @param status 0: form is clean, 1: form is modified.*/
+    void newStatus(const QString &formName, int status);
+};
+
+}
+
+#endif