Eeschema object list and other minor improvements.

* Convert Eeschema from manually linked list to DLIST for storing SCH_ITEM objects. * Add helper functions to SCH_SCREEN for appending list of SCH_ITEM objects. * Fix bug in wire editing code for accurate undo/redo behavior. * Add member to DLIST to append another DLIST. * Other minor code cleaning.

Eeschema object list and other minor improvements.
* Convert Eeschema from manually linked list to DLIST for storing SCH_ITEM objects. * Add helper functions to SCH_SCREEN for appending list of SCH_ITEM objects. * Fix bug in wire editing code for accurate undo/redo behavior. * Add member to DLIST to append another DLIST. * Other minor code cleaning.
aaa1cc3e · Wayne Stambaugh · a1ff3261 · aaa1cc3e · aaa1cc3e · aaa1cc3e
Commit aaa1cc3e authored Feb 26, 2012 by Wayne Stambaugh
37 changed files
--- a/common/base_struct.cpp
+++ b/common/base_struct.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2008-20011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
@@ -217,15 +216,14 @@ EDA_ITEM& EDA_ITEM::operator=( const EDA_ITEM& aItem )
 {
    if( &aItem != this )
    {
-        m_StructType = aItem.Type();
+        m_Image = aItem.m_Image;
-        Pnext = aItem.Pnext;
-        Pback = aItem.Pback;
        m_StructType = aItem.m_StructType;
        m_Parent = aItem.m_Parent;
        m_Son = aItem.m_Son;
        m_Flags = aItem.m_Flags;
-        SetTimeStamp( aItem.m_TimeStamp );
+        m_TimeStamp = aItem.m_TimeStamp;
        m_Status = aItem.m_Status;
+        m_forceVisible = aItem.m_forceVisible;
    }
    return *this;

--- a/common/dlist.cpp
+++ b/common/dlist.cpp
@@ -85,6 +85,36 @@ void DHEAD::append( EDA_ITEM* aNewElement )
 }
+void DHEAD::append( DHEAD& aList )
+{
+    wxCHECK_RET( aList.GetCount() != 0, wxT( "Attempt to append empty list." ) );
+    // Change the item's list to me.
+    for( EDA_ITEM* item = aList.first;  item != NULL;  item = item->Next() )
+        item->SetList( this );
+    if( first )       // list is not empty, set last item's next to the first item in aList
+    {
+        wxCHECK_RET( last != NULL, wxT( "Last list element not set." ) );
+        last->SetNext( aList.first );
+        aList.first->SetBack( last );
+        last = aList.last;
+    }
+    else              // list is empty, first and last are same as aList
+    {
+        first = aList.first;
+        last  = aList.last;
+    }
+    count += aList.count;
+    aList.count = 0;
+    aList.first = NULL;
+    aList.last = NULL;
+}
 void DHEAD::insert( EDA_ITEM* aNewElement, EDA_ITEM* aAfterMe )
 {
    wxASSERT( aNewElement != NULL );

--- a/common/sch_item_struct.cpp
+++ b/common/sch_item_struct.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2006 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
@@ -102,23 +101,6 @@ bool SCH_ITEM::operator < ( const SCH_ITEM& aItem ) const
 }
-SCH_ITEM& SCH_ITEM::operator=( const SCH_ITEM& aItem )
-{
-    wxCHECK_MSG( Type() == aItem.Type(), *this,
-                 wxT( "Cannot assign object type " ) + aItem.GetClass() + wxT( " to type " ) +
-                 GetClass() );
-    if( &aItem != this )
-    {
-        EDA_ITEM::operator=( aItem );
-        m_Layer = aItem.m_Layer;
-        m_connections = aItem.m_connections;
-    }
-    return *this;
-}
 void SCH_ITEM::doPlot( PLOTTER* aPlotter )
 {
    wxFAIL_MSG( wxT( "doPlot() method not implemented for class " ) + GetClass() );

--- a/eeschema/block.cpp
+++ b/eeschema/block.cpp
@@ -559,8 +559,7 @@ void SCH_EDIT_FRAME::PasteListOfItems( wxDC* DC )
        SetSchItemParent( Struct, GetScreen() );
        Struct->Draw( m_canvas, DC, wxPoint( 0, 0 ), GR_DEFAULT_DRAWMODE );
-        Struct->SetNext( GetScreen()->GetDrawItems() );
+        GetScreen()->Append( Struct );
-        GetScreen()->SetDrawItems( Struct );
    }
    SaveCopyInUndoList( picklist, UR_NEW );

--- a/eeschema/bus-wire-junction.cpp
+++ b/eeschema/bus-wire-junction.cpp
--- a/eeschema/edit_label.cpp
+++ b/eeschema/edit_label.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2008-2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 2004-2011 KiCad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
@@ -224,9 +223,8 @@ void SCH_EDIT_FRAME::OnConvertTextType( wxCommandEvent& aEvent )
    m_canvas->CrossHairOff( &dc );   // Erase schematic cursor
    text->Draw( m_canvas, &dc, wxPoint( 0, 0 ), g_XorMode );
-    screen->RemoveFromDrawList( text );
+    screen->Remove( text );
-    screen->AddToDrawList( newtext );
+    screen->Append( newtext );
-    GetScreen()->SetCurItem( newtext );
    m_itemToRepeat = NULL;
    OnModify();
    newtext->Draw( m_canvas, &dc, wxPoint( 0, 0 ), GR_DEFAULT_DRAWMODE );

--- a/eeschema/erc.cpp
+++ b/eeschema/erc.cpp
@@ -211,8 +211,7 @@ int TestDuplicateSheetNames( bool aCreateMarker )
                                         ( (SCH_SHEET*) test_item )->GetPosition() );
                        marker->SetMarkerType( MARK_ERC );
                        marker->SetErrorLevel( ERR );
-                        marker->SetNext( screen->GetDrawItems() );
+                        screen->Append( marker );
-                        screen->SetDrawItems( marker );
                    }
                    err_count++;
@@ -242,8 +241,7 @@ void Diagnose( NETLIST_OBJECT* aNetItemRef, NETLIST_OBJECT* aNetItemTst,
    marker->SetMarkerType( MARK_ERC );
    marker->SetErrorLevel( WAR );
    screen = aNetItemRef->m_SheetList.LastScreen();
-    marker->SetNext( screen->GetDrawItems() );
+    screen->Append( marker );
-    screen->SetDrawItems( marker );
    wxString msg;

--- a/eeschema/load_one_schematic_file.cpp
+++ b/eeschema/load_one_schematic_file.cpp
@@ -57,8 +57,6 @@ bool SCH_EDIT_FRAME::LoadOneEEFile( SCH_SCREEN* aScreen, const wxString& aFullFi
 {
    char            Name1[256];
    bool            itemLoaded = false;
-    SCH_ITEM*       Phead;
-    SCH_ITEM*       Pnext;
    SCH_ITEM*       item;
    wxString        MsgDiag;            // Error and log messages
    char*           line;
@@ -228,8 +226,7 @@ again." );
            }
            else
            {
-                item->SetNext( aScreen->GetDrawItems() );
+                aScreen->Append( item );
-                aScreen->SetDrawItems( item );
            }
        }
@@ -240,19 +237,6 @@ again." );
        }
    }
-    /* GetDrawItems() was constructed in reverse order - reverse it back: */
-    Phead = NULL;
-    while( aScreen->GetDrawItems() )
-    {
-        Pnext = aScreen->GetDrawItems();
-        aScreen->SetDrawItems( aScreen->GetDrawItems()->Next() );
-        Pnext->SetNext( Phead );
-        Phead = Pnext;
-    }
-    aScreen->SetDrawItems( Phead );
 #if 0 && defined (DEBUG)
    aScreen->Show( 0, std::cout );
 #endif

--- a/eeschema/operations_on_items_lists.cpp
+++ b/eeschema/operations_on_items_lists.cpp
@@ -126,11 +126,9 @@ void DeleteItemsInList( EDA_DRAW_PANEL* panel, PICKED_ITEMS_LIST& aItemsList )
        }
        else
        {
-            screen->RemoveFromDrawList( item );
+            screen->Remove( item );
            /* Unlink the structure */
-            item->SetNext( 0 );
-            item->SetBack( 0 );
            itemsList.PushItem( itemWrapper );
        }
    }
@@ -160,11 +158,7 @@ void SCH_EDIT_FRAME::DeleteItem( SCH_ITEM* aItem )
    }
    else
    {
-        screen->RemoveFromDrawList( aItem );
+        screen->Remove( aItem );
-        aItem->SetNext( NULL );
-        aItem->SetBack( NULL );  // Only one struct -> no link
        SaveCopyInUndoList( aItem, UR_DELETED );
        m_canvas->RefreshDrawingRect( aItem->GetBoundingBox() );
    }
@@ -220,8 +214,7 @@ void DuplicateItemsInList( SCH_SCREEN* screen, PICKED_ITEMS_LIST& aItemsList,
            }
            SetSchItemParent( newitem, screen );
-            newitem->SetNext( screen->GetDrawItems() );
+            screen->Append( newitem );
-            screen->SetDrawItems( newitem );
        }
    }

--- a/eeschema/sch_bus_entry.cpp
+++ b/eeschema/sch_bus_entry.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2008-2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 2004-2011 KiCad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_bus_entry.h
+++ b/eeschema/sch_bus_entry.h
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2008-2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 2004-2011 KiCad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_component.cpp
+++ b/eeschema/sch_component.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_component.h
+++ b/eeschema/sch_component.h
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_field.cpp
+++ b/eeschema/sch_field.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2008-2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 2004-2011 KiCad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_field.h
+++ b/eeschema/sch_field.h
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2008-2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 2004-2011 KiCad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_junction.cpp
+++ b/eeschema/sch_junction.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_junction.h
+++ b/eeschema/sch_junction.h
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_line.cpp
+++ b/eeschema/sch_line.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_line.h
+++ b/eeschema/sch_line.h
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_marker.h
+++ b/eeschema/sch_marker.h
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2008-2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 2004-2011 KiCad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_no_connect.cpp
+++ b/eeschema/sch_no_connect.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_no_connect.h
+++ b/eeschema/sch_no_connect.h
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_polyline.cpp
+++ b/eeschema/sch_polyline.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2008-2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 2004-2011 KiCad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_polyline.h
+++ b/eeschema/sch_polyline.h
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2008-2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 2004-2011 KiCad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
@@ -37,7 +36,7 @@
 class SCH_POLYLINE : public SCH_ITEM
 {
-    int m_width;                            /* Thickness */
+    int m_width;                        // Thickness
    std::vector<wxPoint> m_points;      // list of points (>= 2)
 public:

--- a/eeschema/sch_screen.cpp
+++ b/eeschema/sch_screen.cpp
--- a/eeschema/sch_sheet.cpp
+++ b/eeschema/sch_sheet.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 Kicad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_sheet.h
+++ b/eeschema/sch_sheet.h
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_sheet_pin.cpp
+++ b/eeschema/sch_sheet_pin.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2006 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_text.cpp
+++ b/eeschema/sch_text.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/sch_text.h
+++ b/eeschema/sch_text.h
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or

--- a/eeschema/schedit.cpp
+++ b/eeschema/schedit.cpp
@@ -178,12 +178,27 @@ void SCH_EDIT_FRAME::Process_Special_Functions( wxCommandEvent& event )
    case ID_POPUP_SCH_BREAK_WIRE:
    {
+        DLIST< SCH_ITEM > oldWires;
+        oldWires.SetOwnership( false );      // Prevent DLIST for deleting items in destructor.
        m_canvas->MoveCursorToCrossHair();
-        SCH_ITEM* oldWiresList = screen->ExtractWires( true );
+        screen->ExtractWires( oldWires, true );
        screen->BreakSegment( screen->GetCrossHairPosition() );
-        if( oldWiresList )
+        if( oldWires.GetCount() != 0 )
-            SaveCopyInUndoList( oldWiresList, UR_WIRE_IMAGE );
+        {
+            PICKED_ITEMS_LIST oldItems;
+            oldItems.m_Status = UR_WIRE_IMAGE;
+            while( oldWires.GetCount() != 0 )
+            {
+                ITEM_PICKER picker = ITEM_PICKER( oldWires.PopFront(), UR_WIRE_IMAGE );
+                oldItems.PushItem( picker );
+            }
+            SaveCopyInUndoList( oldItems, UR_WIRE_IMAGE );
+        }
        screen->TestDanglingEnds( m_canvas, &dc );
    }

--- a/eeschema/schematic_undo_redo.cpp
+++ b/eeschema/schematic_undo_redo.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2008-2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 2004-2011 KiCad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
@@ -112,13 +111,11 @@ void SCH_EDIT_FRAME::SaveCopyInUndoList( SCH_ITEM*      aItem,
                                         UNDO_REDO_T    aCommandType,
                                         const wxPoint& aTransformPoint )
 {
-    /* Does not save a null item.
+    /* Does not save a null item or a UR_WIRE_IMAGE command type.  UR_WIRE_IMAGE commands
-     * but if aCommandType == UR_WIRE_IMAGE, we must save null item.
+     * are handled by the overloaded version of SaveCopyInUndoList that takes a reference
-     * It happens for the first wire entered in schematic:
+     * to a PICKED_ITEMS_LIST.
-     * To undo this first command, the previous state is a NULL item,
-     * and we accept this
     */
-    if( aItem == NULL && ( aCommandType != UR_WIRE_IMAGE ) )
+    if( aItem == NULL || aCommandType == UR_WIRE_IMAGE )
        return;
    PICKED_ITEMS_LIST* commandToUndo = new PICKED_ITEMS_LIST();
@@ -137,7 +134,6 @@ void SCH_EDIT_FRAME::SaveCopyInUndoList( SCH_ITEM*      aItem,
        break;
    case UR_NEW:
-    case UR_WIRE_IMAGE:
    case UR_DELETED:
    case UR_ROTATED:
    case UR_MOVED:
@@ -145,13 +141,9 @@ void SCH_EDIT_FRAME::SaveCopyInUndoList( SCH_ITEM*      aItem,
        break;
    default:
-    {
+        wxFAIL_MSG( wxString::Format( wxT( "SaveCopyInUndoList() error (unknown code %X)" ),
-        wxString msg;
+                                      aCommandType ) );
-        msg.Printf( wxT( "SaveCopyInUndoList() error (unknown code %X)" ),
+        break;
-                    aCommandType );
-        wxMessageBox( msg );
-    }
-    break;
    }
    if( commandToUndo->GetCount() )
@@ -163,7 +155,9 @@ void SCH_EDIT_FRAME::SaveCopyInUndoList( SCH_ITEM*      aItem,
        GetScreen()->ClearUndoORRedoList( GetScreen()->m_RedoList );
    }
    else
+    {
        delete commandToUndo;
+    }
 }
@@ -174,6 +168,7 @@ void SCH_EDIT_FRAME::SaveCopyInUndoList( PICKED_ITEMS_LIST& aItemsList,
    PICKED_ITEMS_LIST* commandToUndo = new PICKED_ITEMS_LIST();
    commandToUndo->m_TransformPoint = aTransformPoint;
+    commandToUndo->m_Status = aTypeCommand;
    // Copy picker list:
    commandToUndo->CopyList( aItemsList );
@@ -202,6 +197,7 @@ void SCH_EDIT_FRAME::SaveCopyInUndoList( PICKED_ITEMS_LIST& aItemsList,
             */
            if( commandToUndo->GetPickedItemLink( ii ) == NULL )
                commandToUndo->SetPickedItemLink( DuplicateStruct( item, true ), ii );
            wxASSERT( commandToUndo->GetPickedItemLink( ii ) );
            break;
@@ -212,6 +208,7 @@ void SCH_EDIT_FRAME::SaveCopyInUndoList( PICKED_ITEMS_LIST& aItemsList,
        case UR_NEW:
        case UR_DELETED:
        case UR_EXCHANGE_T:
+        case UR_WIRE_IMAGE:
            break;
        default:
@@ -220,7 +217,7 @@ void SCH_EDIT_FRAME::SaveCopyInUndoList( PICKED_ITEMS_LIST& aItemsList,
        }
    }
-    if( commandToUndo->GetCount() )
+    if( commandToUndo->GetCount() || aTypeCommand == UR_WIRE_IMAGE )
    {
        /* Save the copy in undo list */
        GetScreen()->PushCommandToUndoList( commandToUndo );
@@ -229,7 +226,9 @@ void SCH_EDIT_FRAME::SaveCopyInUndoList( PICKED_ITEMS_LIST& aItemsList,
        GetScreen()->ClearUndoORRedoList( GetScreen()->m_RedoList );
    }
    else    // Should not occur
+    {
        delete commandToUndo;
+    }
 }
@@ -238,9 +237,36 @@ void SCH_EDIT_FRAME::PutDataInPreviousState( PICKED_ITEMS_LIST* aList, bool aRed
    SCH_ITEM* item;
    SCH_ITEM* alt_item;
-    // Undo in the reverse order of list creation: (this can allow stacked
+    // Exchange the current wires, buses, and junctions with the copy save by the last edit.
-    // changes like the same item can be changes and deleted in the same
+    if( aList->m_Status == UR_WIRE_IMAGE )
-    // complex command
+    {
+        DLIST< SCH_ITEM > oldWires;
+        // Prevent items from being deleted when the DLIST goes out of scope.
+        oldWires.SetOwnership( false );
+        // Remove all of the wires, buses, and junctions from the current screen.
+        GetScreen()->ExtractWires( oldWires, false );
+        // Copy the saved wires, buses, and junctions to the current screen.
+        for( unsigned int i = 0;  i < aList->GetCount();  i++ )
+            GetScreen()->Append( (SCH_ITEM*) aList->GetPickedItem( i ) );
+        aList->ClearItemsList();
+        // Copy the previous wires, buses, and junctions to the picked item list for the
+        // redo operation.
+        while( oldWires.GetCount() != 0 )
+        {
+            ITEM_PICKER picker = ITEM_PICKER( oldWires.PopFront(), UR_WIRE_IMAGE );
+            aList->PushItem( picker );
+        }
+        return;
+    }
+    // Undo in the reverse order of list creation: (this can allow stacked changes like the
+    // same item can be changes and deleted in the same complex command.
    for( int ii = aList->GetCount() - 1; ii >= 0; ii--  )
    {
        item = (SCH_ITEM*) aList->GetPickedItem( ii );
@@ -253,18 +279,21 @@ void SCH_EDIT_FRAME::PutDataInPreviousState( PICKED_ITEMS_LIST* aList, bool aRed
        switch( aList->GetPickedItemStatus( ii ) )
        {
        case UR_CHANGED: /* Exchange old and new data for each item */
+            // tmp = item->Clone();
+            // *item = *image;
+            // *image = *tmp;
+            // delete tmp;
            item->SwapData( image );
            break;
        case UR_NEW:     /* new items are deleted */
            aList->SetPickedItemStatus( UR_DELETED, ii );
-            GetScreen()->RemoveFromDrawList( item );
+            GetScreen()->Remove( item );
            break;
-        case UR_DELETED: /* deleted items are put in EEdrawList, as new items */
+        case UR_DELETED: /* deleted items are put in the draw item list, as new items */
            aList->SetPickedItemStatus( UR_NEW, ii );
-            item->SetNext( GetScreen()->GetDrawItems() );
+            GetScreen()->Append( item );
-            GetScreen()->SetDrawItems( item );
            break;
        case UR_MOVED:
@@ -275,55 +304,32 @@ void SCH_EDIT_FRAME::PutDataInPreviousState( PICKED_ITEMS_LIST* aList, bool aRed
            break;
        case UR_MIRRORED_Y:
-        {
+            item->Mirror_Y( aList->m_TransformPoint.x );
-            wxPoint mirrorPoint = aList->m_TransformPoint;
+            break;
-            item->Mirror_Y( mirrorPoint.x );
-        }
-        break;
        case UR_MIRRORED_X:
-        {
+            item->Mirror_X( aList->m_TransformPoint.y );
-            wxPoint mirrorPoint = aList->m_TransformPoint;
+            break;
-            item->Mirror_X( mirrorPoint.y );
-        }
-        break;
        case UR_ROTATED:
-        {
            // To undo a rotate 90 deg transform we must rotate 270 deg to undo
            // and 90 deg to redo:
-            wxPoint RotationPoint = aList->m_TransformPoint;
+            item->Rotate( aList->m_TransformPoint );
-            item->Rotate( RotationPoint );
            if( aRedoCommand )
                break;  // A only one rotate transform is OK
-            // Make 3 rotate 90 deg transforms is this is actually an undo command
-            item->Rotate( RotationPoint );
-            item->Rotate( RotationPoint );
-        }
-        break;
-        case UR_WIRE_IMAGE:
-            /* Exchange the current wires and the old wires */
-            alt_item = GetScreen()->ExtractWires( false );
-            aList->SetPickedItem( alt_item, ii );
-            while( item )
-            {
-                SCH_ITEM* nextitem = item->Next();
-                item->SetNext( GetScreen()->GetDrawItems() );
-                GetScreen()->SetDrawItems( item );
-                item->ClearFlags();
-                item = nextitem;
-            }
+            // Make 3 rotate 90 deg transforms is this is actually an undo command
+            item->Rotate( aList->m_TransformPoint );
+            item->Rotate( aList->m_TransformPoint );
            break;
        case UR_EXCHANGE_T:
            alt_item = (SCH_ITEM*) aList->GetPickedItemLink( ii );
            alt_item->SetNext( NULL );
            alt_item->SetBack( NULL );
-            GetScreen()->RemoveFromDrawList( item );
+            GetScreen()->Remove( item );
-            GetScreen()->AddToDrawList( alt_item );
+            GetScreen()->Append( alt_item );
            aList->SetPickedItem( alt_item, ii );
            aList->SetPickedItemLink( item, ii );
            break;

--- a/eeschema/schframe.cpp
+++ b/eeschema/schframe.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
@@ -930,7 +929,7 @@ void SCH_EDIT_FRAME::addCurrentItemToList( wxDC* aDC )
        if( undoItem == item )
        {
            if( !screen->CheckIfOnDrawList( item ) )  // don't want a loop!
-                screen->AddToDrawList( item );
+                screen->Append( item );
            SetRepeatItem( item );

--- a/eeschema/sheet.cpp
+++ b/eeschema/sheet.cpp
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2006 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2009-2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 2004-2011 KiCad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
@@ -282,14 +281,14 @@ static void ExitSheet( EDA_DRAW_PANEL* aPanel, wxDC* aDC )
    }
    else if( item->IsMoving() || item->IsResized() )
    {
-        screen->RemoveFromDrawList( item );
+        screen->Remove( item );
        delete item;
        item = parent->GetUndoItem();
        wxCHECK_RET( item != NULL, wxT( "Cannot restore undefined last sheet item." ) );
-        screen->AddToDrawList( item );
+        screen->Append( item );
        // the owner of item is no more parent, this is the draw list of screen:
        parent->SetUndoItem( NULL );

--- a/include/class_sch_screen.h
+++ b/include/class_sch_screen.h
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2009 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 1992-2011 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
@@ -32,6 +31,7 @@
 #define CLASS_SCREEN_H
 #include <macros.h>
+#include <dlist.h>
 #include <sch_item_struct.h>
 #include <class_base_screen.h>
 #include <class_title_block.h>
@@ -73,8 +73,8 @@ class SCH_SCREEN : public BASE_SCREEN
    /// Position of the origin axis, which is used in exports mostly, but not yet in EESCHEMA
    wxPoint     m_originAxisPosition;
-    SCH_ITEM*   m_drawList;     ///< Object list for the screen.
+    DLIST< SCH_ITEM > m_drawList;     ///< Object list for the screen.
-                                /// @todo use DLIST<SCH_ITEM> or superior container
+                                      /// @todo use DLIST<SCH_ITEM> or superior container
    /**
     * Function addConnectedItemsToBlock
@@ -122,8 +122,17 @@ public:
     * Function GetDrawItems().
     * @return - A pointer to the first item in the linked list of draw items.
     */
-    SCH_ITEM* GetDrawItems() const          { return m_drawList; }
+    SCH_ITEM* GetDrawItems() const          { return m_drawList.begin(); }
-    void SetDrawItems( SCH_ITEM* aItem )    { m_drawList = aItem; }
+    void Append( SCH_ITEM* aItem )          { m_drawList.Append( aItem ); }
+    /**
+     * Function Append
+     * adds \a aList of SCH_ITEM objects to the list for draw items for the sheet.
+     *
+     * @param aList A reference to a #DLIST containing the #SCH_ITEM to add to the sheet.
+     */
+    void Append( DLIST< SCH_ITEM >& aList ) { m_drawList.Append( aList ); }
    /**
     * Function GetCurItem
@@ -184,11 +193,13 @@ public:
    void Plot( PLOTTER* aPlotter );
    /**
-     * Remove \a aItem from the schematic associated with this screen.
+     * Function Remove
+     * removes \a aItem from the schematic associated with this screen.
     *
-     * @param aItem - Item to be removed from schematic.
+     * @note The removed item is not deleted.  It is only unlinked from the item list.
+     * @param aItem Item to be removed from schematic.
     */
-    void RemoveFromDrawList( SCH_ITEM* aItem );
+    void Remove( SCH_ITEM* aItem );
    /**
     * Function DeleteItem
@@ -201,8 +212,6 @@ public:
    bool CheckIfOnDrawList( SCH_ITEM* st );
-    void AddToDrawList( SCH_ITEM* st );
    /**
     * Function SchematicCleanUp
     * performs routine schematic cleaning including breaking wire and buses and
@@ -226,23 +235,24 @@ public:
    /**
     * Function ExtractWires
     * extracts the old wires, junctions and buses.  If \a aCreateCopy is true, replace
-     * them with a copy.  Old item must be put in undo list, and the new ones can be
+     * extracted items with a copy of the original.  Old items are to be put in undo list,
-     * modified by clean up safely.  If an abort command is made, old wires must be put
+     * and the new ones can be modified by clean up safely.  If an abort draw segmat command
-     * in GetDrawItems(), and copies must be deleted.  This is because previously stored
+     * is made, the old wires must be put back into #m_drawList, and the copies must be
-     * undo commands can handle pointers on wires or buses, and we do not delete wires or
+     * deleted.  This is because previously stored undo commands can handle pointers on wires
-     * buss-es, we must put they in undo list.
+     * or buses, and we do not delete wires or buses, we must put them in undo list.
     *
-     * Because cleanup delete and/or modify bus and wires, the it is easier is to put
+     * Because cleanup deletes and/or modify bus and wires, it is easier is to put
-     * all wires in undo list and use a new copy of wires for cleanup.
+     * all the existing  wires in undo list and use a new copy of wires for cleanup.
     */
-    SCH_ITEM* ExtractWires( bool aCreateCopy );
+    void ExtractWires( DLIST< SCH_ITEM >& aList, bool aCreateCopy );
    /**
     * Function ReplaceWires
-     * replaces all of the wires and junction in the screen with \a aWireList.
+     * replaces all of the wires, buses, and junctions in the screen with \a aWireList.
-     * @param aWireList List of wire to replace the existing wires with.
+     *
+     * @param aWireList List of wires to replace the existing wires with.
     */
-    void ReplaceWires( SCH_ITEM* aWireList );
+    void ReplaceWires( DLIST< SCH_ITEM >& aWireList );
    /**
     * Function MarkConnections

--- a/include/dlist.h
+++ b/include/dlist.h
@@ -63,22 +63,31 @@ protected:
    /**
     * Function append
     * adds \a aNewElement to the end of the list.
+     * @param aNewElement The element to insert.
     */
    void append( EDA_ITEM* aNewElement );
+    /**
+     * Function append
+     * adds \a aList to the end of the list.
+     * @param aList The list to aList.
+     */
+    void append( DHEAD& aList );
    /**
     * Function insert
-     * puts aNewElement just in front of aElementAfterMe in the list sequence.
+     * puts \a aNewElement just in front of \a aElementAfterMe in the list sequence.
-     * If aElementAfterMe is NULL, then simply append().
+     * If \a aElementAfterMe is NULL, then simply append().
     * @param aNewElement The element to insert.
     * @param aElementAfterMe The element to insert \a aNewElement before,
-     *  if NULL then append aNewElement onto end of list.
+     *                        if NULL then append \a aNewElement onto end of list.
     */
    void insert( EDA_ITEM* aNewElement, EDA_ITEM* aElementAfterMe );
    /**
     * Function insert
-     * puts aNewElement in front of list sequence.
+     * puts \a aNewElement in front of list sequence.
+     * @param aNewElement The element to insert.
     */
    void insert( EDA_ITEM* aNewElement )
    {
@@ -88,6 +97,7 @@ protected:
    /**
     * Function remove
     * removes \a aElement from the list, but does not delete it.
+     * @param aElement The element to remove.
     */
    void remove( EDA_ITEM* aElement );
@@ -162,16 +172,30 @@ public:
    /**
     * Function Append
     * adds \a aNewElement to the end of the list.
+     * @param aNewElement The element to insert.
     */
    void Append( T* aNewElement )
    {
        append( aNewElement );
    }
+    /**
+     * Function Append
+     * adds \a aList to the end of the list.
+     * @param aList The list to append to the end of the list.
+     */
+    void Append( DLIST& aList )
+    {
+        append( aList );
+    }
    /**
     * Function Insert
-     * puts aNewElement just in front of aElementAfterMe in the list sequence.
+     * puts \a aNewElement just in front of \a aElementAfterMe in the list sequence.
     * If aElementAfterMe is NULL, then simply Append()
+     * @param aNewElement The element to insert.
+     * @param aElementAfterMe The element to insert \a aNewElement before,
+     *                        if NULL then append \a aNewElement onto end of list.
     */
    void Insert( T* aNewElement, T* aElementAfterMe )
    {
@@ -181,6 +205,7 @@ public:
    /**
     * Function Remove
     * removes \a aElement from the list, but does not delete it.
+     * @param aElement The element to remove from the list.
     * @return T* - the removed element, so you can easily delete it upon return.
     */
    T* Remove( T* aElement )
@@ -210,6 +235,7 @@ public:
    /**
     * Function PushFront
     * puts aNewElement at front of list sequence.
+     * @param aNewElement The element to insert at the front of the list.
     */
    void PushFront( T* aNewElement )
    {
@@ -219,6 +245,7 @@ public:
    /**
     * Function PushBack
     * puts aNewElement at the end of the list sequence.
+     * @param aNewElement The element to push to the end of the list.
     */
    void PushBack( T* aNewElement )
    {

--- a/include/sch_item_struct.h
+++ b/include/sch_item_struct.h
@@ -2,7 +2,6 @@
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2004 Jean-Pierre Charras, jaen-pierre.charras@gipsa-lab.inpg.com
- * Copyright (C) 2008-2011 Wayne Stambaugh <stambaughw@verizon.net>
 * Copyright (C) 2004-2011 KiCad Developers, see change_log.txt for contributors.
 *
 * This program is free software; you can redistribute it and/or
@@ -352,8 +351,6 @@ public:
    virtual bool operator <( const SCH_ITEM& aItem ) const;
-    virtual SCH_ITEM& operator=( const SCH_ITEM& aItem );
    /**
     * @note - The DoXXX() functions below are used to enforce the interface while retaining
     *         the ability of change the implementation behavior of derived classes.  See