pcbnew: Starting work on undo/redo in pcbnew. Only some delete item commands are stored in undo/redo stack

include/class_pcb_screen.h

@@ -0,0 +1,72 @@
+/**************************************************************/
+/*  pcbstruct.h :  definition des structures de donnees type PCB */
+/**************************************************************/
+
+#ifndef __CLASSPCB_SCREEN_H__
+#define __CLASSPCB_SCREEN_H__
+
+#
+
+/* Handle info to display a board */
+class PCB_SCREEN : public BASE_SCREEN
+{
+public:
+    int m_Active_Layer;             /* ref couche active */
+    int m_Route_Layer_TOP;          /* ref couches actives */
+    int m_Route_Layer_BOTTOM;       /* pour placement vias et routage 2 couches */
+
+public:
+    PCB_SCREEN();
+    ~PCB_SCREEN();
+
+    PCB_SCREEN* Next() { return (PCB_SCREEN*) Pnext; }
+    void        Init();
+    void        SetNextZoom();
+    void        SetPreviousZoom();
+    void        SetLastZoom();
+
+    virtual int GetInternalUnits( void );
+
+    /**
+     * Function GetCurItem
+     * returns the currently selected BOARD_ITEM, overriding BASE_SCREEN::GetCurItem().
+     * @return BOARD_ITEM* - the one selected, or NULL.
+     */
+    BOARD_ITEM* GetCurItem() const {  return (BOARD_ITEM*) BASE_SCREEN::GetCurItem(); }
+
+    /**
+     * Function SetCurItem
+     * sets the currently selected object, m_CurrentItem.
+     * @param aItem Any object derived from BOARD_ITEM
+     */
+    void SetCurItem( BOARD_ITEM* aItem ) { BASE_SCREEN::SetCurItem( aItem ); }
+
+
+    /* Return true if a microvia can be put on board
+     * A microvia ia a small via restricted to 2 near neighbour layers
+     * because its is hole is made by laser which can penetrate only one layer
+     * It is mainly used to connect BGA to the first inner layer
+     * And it is allowed from an external layer to the first inner layer
+     */
+    bool IsMicroViaAcceptable( void );
+
+    /* full undo redo management : */
+    // use BASE_SCREEN::ClearUndoRedoList()
+    // use BASE_SCREEN::PushCommandToUndoList( PICKED_ITEMS_LIST* aItem )
+    // use BASE_SCREEN::PushCommandToRedoList( PICKED_ITEMS_LIST* aItem )
+
+    /** Function ClearUndoORRedoList
+     * free the undo or redo list from List element
+     *  Wrappers are deleted.
+     *  datas pointed by wrappers are deleted if not in use in schematic
+     *  i.e. when they are copy of a schematic item or they are no more in use (DELETED)
+     * @param aList = the UNDO_REDO_CONTAINER to clear
+     * @param aItemCount = the count of items to remove. < 0 for all items
+     * items are removed from the beginning of the list.
+     * So this function can be called to remove old commands
+     */
+    void         ClearUndoORRedoList( UNDO_REDO_CONTAINER& aList, int aItemCount = -1 );
+};
+
+
+#endif /* __CLASSPCB_SCREEN_H__ */