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diff --git a/src/itemgroup.h b/src/itemgroup.h
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+/***************************************************************************
+ *   Copyright (C) 2005 by David Saxton                                    *
+ *   [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 ITEMGROUP_H
+#define ITEMGROUP_H
+
+#include <qguardedptr.h>
+
+class Item;
+class ICNDocument;
+class ItemDocument;
+class DoubleSpinBox;
+class ItemGroup;
+class MechanicsDocument;
+class Variant;
+
+typedef QValueList<QGuardedPtr<Item> > ItemList;
+
+class QCanvasItem;
+class QCanvasItemList;
+
+/**
+Generic base class for controlling a selection of Item. Provides
+some functionality such as for dealing with item data
+@author David Saxton
+*/
+class ItemGroup : public QObject
+{
+Q_OBJECT
+public:
+	ItemGroup( ItemDocument *view, const char *name = 0 );
+	virtual ~ItemGroup();
+	
+	/**
+	 * Returns a pointer to the "active" CNItem - i.e. the last CNItem
+	 * to be added to the CNItemGroup. This will always return a pointer to
+	 * a single item, unless there are no CNItems in the group
+	 */
+	Item *activeItem() const { return m_activeItem; }
+	uint itemCount() const { return m_itemList.count(); }
+	virtual bool addQCanvasItem( QCanvasItem *qcanvasItem ) = 0;
+	virtual void setItems( QCanvasItemList list ) = 0;
+	virtual void removeQCanvasItem( QCanvasItem *qcanvasItem ) = 0;
+	virtual bool contains( QCanvasItem *qcanvasItem ) const = 0;
+	virtual uint count() const = 0;
+	bool isEmpty() const { return (count() == 0); }
+	virtual void mergeGroup( ItemGroup *group ) = 0;
+	virtual void removeAllItems() = 0;
+	virtual void deleteAllItems() = 0;
+	/**
+	 * Returns a list of all the Items in the group.
+	 * @param excludeParented whether to return items whose (grand-) parents are
+	 * already in the list.
+	 */
+	ItemList items( bool excludeParented = true ) const;
+	/**
+	 * Sets the selected state of all items in the group
+	 */
+	virtual void setSelected( bool sel ) = 0;
+	
+	/**
+	 * Returns true iff either there are no items, or itemsAreSameType and the
+	 * value of each data (excluding hidden data) for each item is the same
+	 */
+	bool itemsHaveSameData() const;
+	/**
+	 * Returns truee iff either there are no items, or itemsAreSameType and the
+	 * value of the data with the given id is the same for each item
+	 */
+	bool itemsHaveSameDataValue( const QString &id ) const;
+	/**
+	 * Returns true iff all the iff itemsHaveSameData() returns true and the
+	 * value of the data are the defaults
+	 */
+	bool itemsHaveDefaultData() const;
+	/**
+	 * Returns true if all the items in the group are the same (e.g.
+	 * resistors). This is checked for by looking at the ids of the items,
+	 * and seeing if the string before "__#" is the same Note: if there are zero
+	 * items in the group, then this will return true
+	 */
+	bool itemsAreSameType() const { return b_itemsAreSameType; }
+	
+public slots:
+	/**
+	 * Align the selected items horizontally so that their positions have the
+	 * same y coordinate.
+	 */
+	void slotAlignHorizontally();
+	/**
+	 * Align the selected items horizontally so that their positions have the
+	 * same x coordinate.
+	 */
+	void slotAlignVertically();
+	/**
+	 * Distribute the selected items horizontally so that they have the same
+	 * spacing in the horizontal direction.
+	 */
+	void slotDistributeHorizontally();
+	/**
+	 * Distribute the selected items vertically so that they have the same
+	 * spacing in the vertical direction.
+	 */
+	void slotDistributeVertically();
+	
+signals:
+	void itemAdded( Item *item );
+	void itemRemoved( Item *item );
+	
+protected:
+	/**
+	 * Subclasses must call this to register the item with the data interface
+	 */
+	void registerItem( Item *item );
+	/**
+	 * Subclasses must call this to unregister the item with the data interface
+	 */
+	void unregisterItem( Item *item );
+	void updateAreSameStatus();
+	
+	ItemList m_itemList;
+	bool b_itemsAreSameType;
+	ItemDocument * p_view;
+	
+	ICNDocument *p_icnDocument;
+	MechanicsDocument *p_mechanicsDocument;;
+	Item *m_activeItem;
+	
+private slots:
+	void getViewPtrs();
+};
+
+#endif