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diff --git a/include/class_base_screen.h b/include/class_base_screen.h
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+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2015 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
+ * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
+ * Copyright (C) 1992-2015 KiCad Developers, see AUTHORS.txt for contributors.
+ *
+ * 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.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @file class_base_screen.h
+ * @brief BASE_SCREEN class implementation.
+ */
+
+#ifndef  CLASS_BASE_SCREEN_H_
+#define  CLASS_BASE_SCREEN_H_
+
+#include <draw_frame.h>
+#include <base_struct.h>
+#include <class_undoredo_container.h>
+#include <block_commande.h>
+#include <common.h>
+#include <id.h>
+
+/**
+ * Class GRID_TYPE
+ * is for grid arrays.
+ */
+class GRID_TYPE
+{
+public:
+    int         m_CmdId;    // The command id of this grid ( first id is ID_POPUP_GRID_LEVEL_1000 )
+    wxRealPoint m_Size;     // the size in internal unit of the grid (can differ for X and Y axis)
+
+    GRID_TYPE& operator=( const GRID_TYPE& item )
+    {
+        if( this != &item )
+        {
+            m_CmdId   = item.m_CmdId;
+            m_Size = item.m_Size;
+        }
+
+        return *this;
+    }
+
+    const bool operator==( const GRID_TYPE& item ) const
+    {
+        return m_Size == item.m_Size && m_CmdId == item.m_CmdId;
+    }
+};
+
+
+typedef std::vector<GRID_TYPE> GRIDS;
+
+
+/**
+ * Class BASE_SCREEN
+ * handles how to draw a screen (a board, a schematic ...)
+ */
+class BASE_SCREEN : public EDA_ITEM
+{
+private:
+    GRIDS       m_grids;            ///< List of valid grid sizes.
+    bool        m_FlagModified;     ///< Indicates current drawing has been modified.
+    bool        m_FlagSave;         ///< Indicates automatic file save.
+    EDA_ITEM*   m_CurrentItem;      ///< Currently selected object
+    GRID_TYPE   m_Grid;             ///< Current grid selection.
+    wxPoint     m_scrollCenter;     ///< Current scroll center point in logical units.
+    wxPoint     m_MousePosition;    ///< Mouse cursor coordinate in logical units.
+    int         m_UndoRedoCountMax; ///< undo/Redo command Max depth
+
+    /**
+     * The cross hair position in logical (drawing) units.  The cross hair is not the cursor
+     * position.  It is an addition indicator typically drawn on grid to indicate to the
+     * user where the current action will be performed.
+     */
+    wxPoint     m_crossHairPosition;
+
+    double      m_Zoom;             ///< Current zoom coefficient.
+
+    //----< Old public API now is private, and migratory>------------------------
+    // called only from EDA_DRAW_FRAME
+    friend class EDA_DRAW_FRAME;
+
+    /**
+     * Function getCrossHairPosition
+     * return the current cross hair position in logical (drawing) coordinates.
+     * @param aInvertY Inverts the Y axis position.
+     * @return The cross hair position in drawing coordinates.
+     */
+    wxPoint getCrossHairPosition( bool aInvertY ) const
+    {
+        if( aInvertY )
+            return wxPoint( m_crossHairPosition.x, -m_crossHairPosition.y );
+
+        return wxPoint( m_crossHairPosition.x, m_crossHairPosition.y );
+    }
+
+    /**
+     * Function setCrossHairPosition
+     * sets the screen cross hair position to \a aPosition in logical (drawing) units.
+     * @param aPosition The new cross hair position.
+     * @param aGridOrigin Origin point of the snap grid.
+     * @param aSnapToGrid Sets the cross hair position to the nearest grid position to
+     *                    \a aPosition.
+     *
+     */
+    void setCrossHairPosition( const wxPoint& aPosition, const wxPoint& aGridOrigin, bool aSnapToGrid );
+
+    /**
+     * Function getCursorScreenPosition
+     * returns the cross hair position in device (display) units.b
+     * @return The current cross hair position.
+     */
+    wxPoint getCrossHairScreenPosition() const;
+
+    /**
+     * Function getNearestGridPosition
+     * returns the nearest \a aGridSize location to \a aPosition.
+     * @param aPosition The position to check.
+     * @param aGridOrigin The origin point of the snap grid.
+     * @param aGridSize The grid size to locate to if provided.  If NULL then the current
+     *                  grid size is used.
+     * @return The nearst grid position.
+     */
+    wxPoint getNearestGridPosition( const wxPoint& aPosition, const wxPoint& aGridOrigin,
+                                    wxRealPoint* aGridSize ) const;
+
+    /**
+     * Function getCursorPosition
+     * returns the current cursor position in logical (drawing) units.
+     * @param aOnGrid Returns the nearest grid position at the current cursor position.
+     * @param aGridOrigin Origin point of the snap grid.
+     * @param aGridSize Custom grid size instead of the current grid size.  Only valid
+     *        if \a aOnGrid is true.
+     * @return The current cursor position.
+     */
+    wxPoint getCursorPosition( bool aOnGrid, const wxPoint& aGridOrigin, wxRealPoint* aGridSize ) const;
+
+    void setMousePosition( const wxPoint& aPosition ) { m_MousePosition = aPosition; }
+
+    /**
+     * Function RefPos
+     * Return the reference position, coming from either the mouse position
+     * or the cursor position.
+     *
+     * @param useMouse If true, return mouse position, else cursor's.
+     *
+     * @return wxPoint - The reference point, either the mouse position or
+     *                   the cursor position.
+     */
+    wxPoint refPos( bool useMouse ) const
+    {
+        return useMouse ? m_MousePosition : m_crossHairPosition;
+    }
+
+    const wxPoint& getScrollCenterPosition() const          { return m_scrollCenter; }
+    void setScrollCenterPosition( const wxPoint& aPoint )   { m_scrollCenter = aPoint; }
+
+    //----</Old public API now is private, and migratory>------------------------
+
+
+public:
+    static  wxString m_PageLayoutDescrFileName; ///< the name of the page layout descr file,
+                                                ///< or emty to used the default pagelayout
+
+    wxPoint     m_DrawOrg;          ///< offsets for drawing the circuit on the screen
+
+    wxPoint     m_O_Curseur;        ///< Relative Screen cursor coordinate (on grid)
+                                    ///< in user units. (coordinates from last reset position)
+
+    // Scrollbars management:
+    int         m_ScrollPixelsPerUnitX; ///< Pixels per scroll unit in the horizontal direction.
+    int         m_ScrollPixelsPerUnitY; ///< Pixels per scroll unit in the vertical direction.
+
+    wxSize      m_ScrollbarNumber;  /**< Current virtual draw area size in scroll units.
+                                     * m_ScrollbarNumber * m_ScrollPixelsPerUnit =
+                                     * virtual draw area size in pixels */
+
+    wxPoint     m_ScrollbarPos;     ///< Current scroll bar position in scroll units.
+
+    wxPoint     m_StartVisu;        /**< Coordinates in drawing units of the current
+                                     * view position (upper left corner of device)
+                                     */
+
+    bool        m_Center;           /**< Center on screen.  If true (0.0) is centered
+                                     * on screen coordinates can be < 0 and
+                                     * > 0 except for schematics.
+                                     * false: when coordinates can only be >= 0
+                                     * Schematic */
+    bool        m_FirstRedraw;
+
+    // Undo/redo list of commands
+    UNDO_REDO_CONTAINER m_UndoList;         ///< Objects list for the undo command (old data)
+    UNDO_REDO_CONTAINER m_RedoList;         ///< Objects list for the redo command (old data)
+
+    // block control
+    BLOCK_SELECTOR      m_BlockLocate;      ///< Block description for block commands
+
+    int                 m_ScreenNumber;
+    int                 m_NumberOfScreens;
+
+    std::vector<double> m_ZoomList;         ///< standard zoom (i.e. scale) coefficients.
+    bool                m_IsPrinting;
+
+public:
+    BASE_SCREEN( KICAD_T aType = SCREEN_T );
+    ~BASE_SCREEN();
+
+    /**
+     * Function SetCurItem
+     * sets the currently selected object, m_CurrentItem.
+     * @param aItem Any object derived from EDA_ITEM
+     */
+    void SetCurItem( EDA_ITEM* aItem ) { m_CurrentItem = aItem; }
+
+    EDA_ITEM* GetCurItem() const { return m_CurrentItem; }
+
+    void InitDataPoints( const wxSize& aPageSizeInternalUnits );
+
+    /**
+     * Function MilsToIuScalar
+     * returns the scalar required to convert mils to internal units.
+     *
+     * @note This is a temporary hack until the derived objects SCH_SCREEN and PCB_SCREEN
+     *       no longer need to be derived from BASE_SCREEN.  I does allow removal of the
+     *       obsolete GetInternalUnits function.
+     */
+    virtual int MilsToIuScalar() { return 1; }
+
+    /* general Undo/Redo command control */
+
+    /**
+     * Function ClearUndoORRedoList (virtual).
+     * this function must remove the aItemCount old commands from aList
+     * and delete commands, pickers and picked items if needed
+     * Because picked items must be deleted only if they are not in use, this
+     * is a virtual pure function that must be created for SCH_SCREEN and
+     * PCB_SCREEN
+     * @param aList = the UNDO_REDO_CONTAINER of commands
+     * @param aItemCount = number of old commands to delete. -1 to remove all
+     *                     old commands this will empty the list of commands.
+     *  Commands are deleted from the older to the last.
+     */
+    virtual void ClearUndoORRedoList( UNDO_REDO_CONTAINER& aList, int aItemCount = -1 ) = 0;
+
+    /**
+     * Function ClearUndoRedoList
+     * clear undo and redo list, using ClearUndoORRedoList()
+     * picked items are deleted by ClearUndoORRedoList() according to their
+     * status
+     */
+    virtual void ClearUndoRedoList();
+
+    /**
+     * Function PushCommandToUndoList
+     * add a command to undo in undo list
+     * delete the very old commands when the max count of undo commands is
+     * reached
+     * ( using ClearUndoORRedoList)
+     */
+    virtual void PushCommandToUndoList( PICKED_ITEMS_LIST* aItem );
+
+    /**
+     * Function PushCommandToRedoList
+     * add a command to redo in redo list
+     * delete the very old commands when the max count of redo commands is
+     * reached
+     * ( using ClearUndoORRedoList)
+     */
+    virtual void PushCommandToRedoList( PICKED_ITEMS_LIST* aItem );
+
+    /** PopCommandFromUndoList
+     * return the last command to undo and remove it from list
+     * nothing is deleted.
+     */
+    virtual PICKED_ITEMS_LIST* PopCommandFromUndoList();
+
+    /** PopCommandFromRedoList
+     * return the last command to undo and remove it from list
+     * nothing is deleted.
+     */
+    virtual PICKED_ITEMS_LIST* PopCommandFromRedoList();
+
+    int GetUndoCommandCount() const
+    {
+        return m_UndoList.m_CommandsList.size();
+    }
+
+    int GetRedoCommandCount() const
+    {
+        return m_RedoList.m_CommandsList.size();
+    }
+
+    int GetMaxUndoItems() const { return m_UndoRedoCountMax; }
+
+    void SetMaxUndoItems( int aMax )
+    {
+        if( aMax >= 0 && aMax < ABS_MAX_UNDO_ITEMS )
+            m_UndoRedoCountMax = aMax;
+        else
+        {
+            wxFAIL_MSG( "Maximum undo items not within limits" );
+            m_UndoRedoCountMax = DEFAULT_MAX_UNDO_ITEMS;
+        }
+    }
+
+    void SetModify()        { m_FlagModified = true; }
+    void ClrModify()        { m_FlagModified = false; }
+    void SetSave()          { m_FlagSave = true; }
+    void ClrSave()          { m_FlagSave = false; }
+    bool IsModify() const   { return m_FlagModified; }
+    bool IsSave() const     { return m_FlagSave; }
+
+
+    //----<zoom stuff>---------------------------------------------------------
+
+    /**
+     * Function GetZoom
+     * returns the current "zoom factor", which is a measure of
+     * "internal units per device unit", or "world units per device unit".
+     * A device unit is typically a pixel.
+     */
+    double GetZoom() const      { return m_Zoom; }
+
+    /**
+     * Function SetZoom
+     * adjusts the current zoom factor.
+     *
+     * @param iu_per_du is the number of internal units (world units) per
+     *   device units (pixels typically).
+     */
+    bool SetZoom( double iu_per_du );
+
+    bool SetNextZoom();
+    bool SetPreviousZoom();
+    bool SetFirstZoom();
+    bool SetLastZoom();
+
+    /**
+     * Function GetMaxAllowedZoom
+     * returns the maximum allowed zoom factor, which was established as the last entry
+     * in m_ZoomList.
+     */
+    double GetMaxAllowedZoom() const    { return m_ZoomList.size() ? *m_ZoomList.rbegin() : 1.0; }
+
+    /**
+     * Function GetMinAllowedZoom
+     * returns the minimum allowed zoom factor, which was established as the first entry
+     * in m_ZoomList.
+     */
+    double GetMinAllowedZoom() const    { return m_ZoomList.size() ? *m_ZoomList.begin() : 1.0; }
+
+    /**
+     * Function SetScalingFactor
+     * sets the scaling factor of "internal unit per device unit".
+     * If the output device is a screen, then "device units" are pixels.  The
+     * "logical unit" is wx terminology, and corresponds to KiCad's "Internal Unit (IU)".
+     * <p>
+     * This scaling factor is "internal units per device unit".  This function is
+     * the same thing currently as SetZoom(), but clamps the argument within a
+     * legal range.
+
+     * @param iu_per_du is the current scale used to draw items onto the device
+     *   context wxDC.
+     */
+    void SetScalingFactor( double iu_per_du );
+
+    /**
+     * Function GetScalingFactor
+     * returns the inverse of the current scale used to draw items on screen.
+     * <p>
+     * This function somehow got designed to be the inverse of SetScalingFactor().
+     * <p>
+     * device coordinates = user coordinates * GetScalingFactor()
+     */
+    double GetScalingFactor() const;
+
+
+    //----<grid stuff>----------------------------------------------------------
+
+    /**
+     * Return the command ID of the currently selected grid.
+     *
+     * @return int - Currently selected grid command ID.
+     */
+    int GetGridCmdId() const { return m_Grid.m_CmdId; }
+
+    /**
+     * Return the grid size of the currently selected grid.
+     *
+     * @return wxRealPoint - The currently selected grid size.
+     */
+    const wxRealPoint& GetGridSize() const { return m_Grid.m_Size; }
+
+    /**
+     * Return the grid object of the currently selected grid.
+     *
+     * @return GRID_TYPE - The currently selected grid.
+     */
+    const GRID_TYPE& GetGrid() const { return m_Grid; }
+
+    /**
+     * set the current grid size m_Grid.
+     * The size must be existing in grid list (in m_grids)
+     * If not, the near existing grid size is used
+     * @param size = the size of the new grid
+     * @return the grid id offset (id from ID_POPUP_GRID_LEVEL_1000 )
+     * of the currently selected grid.
+     */
+    int SetGrid( const wxRealPoint& size );
+
+    /**
+     * Function SetGrid
+     * sets the grid size from command ID (not an index in grid list, but a wxID).
+     * @param aCommandId = the wxWidgets command ID
+     * @return the grid id offset (id from ID_POPUP_GRID_LEVEL_1000 )
+     * of the currently selected grid.
+     */
+    int SetGrid( int aCommandId );
+
+    void SetGridList( GRIDS& sizelist );
+    void AddGrid( const GRID_TYPE& grid );
+    void AddGrid( const wxRealPoint& size, int id );
+    void AddGrid( const wxRealPoint& size, EDA_UNITS_T aUnit, int id );
+
+    /**
+     * Function GridExists
+     * tests for grid command ID (not an index in grid list, but a wxID) exists in grid list.
+     * @param aCommandId = the wxWidgets command ID
+     * @return true if the grid exists in grid list.
+     */
+    bool GridExists( int aCommandId );
+
+    /**
+     * Function GetGridCount().
+     * Return the size of the grid list.
+     *
+     * @returns - The size of the grid list.
+     */
+    size_t GetGridCount() const { return m_grids.size(); }
+
+    /**
+     * Function GetGrid()
+     * Returns the grid object at \a aIndex.
+     *
+     * @param aIndex - The grid list index.
+     * @return - The grid object at \a aIndex or the current grid if the grid list is empty.
+     */
+    GRID_TYPE& GetGrid( size_t aIndex );
+
+    /**
+     * Function GetGrids().
+     * Returns the current list of grids.
+     */
+    const GRIDS& GetGrids() const
+    {
+        return m_grids;
+    }
+
+    /**
+     * Function BuildGridsChoiceList().
+     * Build the human readable list of grid list, for menus or combo boxes
+     * the list shows the grid size both in mils or mm.
+     * @param aGridsList = a wxArrayString to populate
+     * @param aMmFirst = true to have mm first and mils after
+     *                   false to have mils first and mm after
+     * @return the index of the curr grid in list, if found or -1
+     */
+    int BuildGridsChoiceList( wxArrayString& aGridsList, bool aMmFirst) const;
+
+
+    /**
+     * Function GetClass
+     * returns the class name.
+     * @return wxString
+     */
+    virtual wxString GetClass() const
+    {
+        return wxT( "BASE_SCREEN" );
+    }
+
+    inline bool IsBlockActive() const { return !m_BlockLocate.IsIdle(); }
+
+    void ClearBlockCommand() { m_BlockLocate.Clear(); }
+
+#if defined(DEBUG)
+    void Show( int nestLevel, std::ostream& os ) const;     // overload
+#endif
+};
+
+#endif  // CLASS_BASE_SCREEN_H_