SwitchLayer() fix

change_log.txt

@@ -5,6 +5,15 @@ Please add newer entries at the top, list the date and your name with
 email address.
 
 
+2007-Dec-14 UPDATE   Dick Hollenbeck <dick@softplc.com>
+================================================================================
++pcbnew
+    WinEDA_PcbFrame::Other_Layer_Route() now returns bool, so that if the DRC
+    would not allow the new via placement, then it can be checked and the layer
+    change can also then be aborted.  Previously the layer change would happen
+    in mid track if the via could not be placed.
+
+
 2007-Dec-13 UPDATE   Dick Hollenbeck <dick@softplc.com>
 ================================================================================
 +pcbnew

include/wxstruct.h

@@ -709,7 +709,20 @@ public:
 
     // Track and via edition:
     void                DisplayTrackSettings();
-    void                Other_Layer_Route( TRACK* track, wxDC* DC );
+    
+    /**
+     * Function Other_Layer_Route
+     * operates in one of two ways.  If argument track is NULL, then swap the active
+     * layer between m_Route_Layer_TOP and m_Route_Layer_BOTTOM.  If a track is
+     * in progress (track is not NULL), and if DRC allows it, place a via on the end
+     * of the current track, and then swap the current active layer and start a new
+     * segment on the new layer.
+     * @param track A TRACK* to append the via to or NULL.
+     * @param DC A device context to draw on.
+     * @return bool - true if the operation was successful, else false such as
+     *   the case where DRC would not allow a via.
+     */ 
+    bool                Other_Layer_Route( TRACK* track, wxDC* DC );
     void                Affiche_PadsNoConnect( wxDC* DC );
     void                Affiche_Status_Net( wxDC* DC );
     TRACK*              Delete_Segment( wxDC* DC, TRACK* Track );

pcbnew/dragsegm.cpp

@@ -241,7 +241,6 @@ void EraseDragListe()
     for( ; pt_drag != NULL; pt_drag = NextStruct )
     {
         NextStruct = pt_drag->Pnext;
-		pt_drag->m_Segm->m_Flags = 0;
         pt_drag->m_Segm->m_Flags = 0;        
         delete pt_drag;
     }

pcbnew/edit.cpp

@@ -1051,7 +1051,17 @@ void WinEDA_PcbFrame::SwitchLayer( wxDC* DC, int layer )
                 GetScreen()->m_Route_Layer_TOP    = preslayer;
                 GetScreen()->m_Route_Layer_BOTTOM = layer;
                 GetScreen()->m_Active_Layer = preslayer;
-                Other_Layer_Route( (TRACK*) GetScreen()->GetCurItem(), DC );
+                
+                if( Other_Layer_Route( (TRACK*) GetScreen()->GetCurItem(), DC ) )
+                {
+                    if( DisplayOpt.ContrastModeDisplay )
+                        GetScreen()->SetRefreshReq();
+                }
+                
+                // if the via was allowed by DRC, then the layer swap has already
+                // been done by Other_Layer_Route(). if via not allowed, then 
+                // return now so assignment to m_Active_Layer below doesn't happen.
+                return;
             }
         }
     }

pcbnew/editrack-part2.cpp

@@ -153,19 +153,10 @@ void WinEDA_PcbFrame::ExChange_Track_Layer( TRACK* pt_segm, wxDC* DC )
 }
 
 
+
 /****************************************************************/
-void WinEDA_PcbFrame::Other_Layer_Route( TRACK* track, wxDC* DC )
+bool WinEDA_PcbFrame::Other_Layer_Route( TRACK* track, wxDC* DC )
 /****************************************************************/
-
-/*
- *  if no track in progress :
- *		swap the active layer between m_Route_Layer_TOP and m_Route_Layer_BOTTOM
- *  if a track is in progress :
- *		put (if possible, i.e. if no DRC problem) a Via on the end of the current
- *		track, swap the current active layer and start a new trac segment on the new layer
- * @param track = track in progress, or NULL
- * @param DC = current device context
- */
 {
     TRACK*  pt_segm;
     SEGVIA* Via;
@@ -180,19 +171,19 @@ void WinEDA_PcbFrame::Other_Layer_Route( TRACK* track, wxDC* DC )
             GetScreen()->m_Active_Layer = GetScreen()->m_Route_Layer_BOTTOM;
         Affiche_Status_Box();
         SetToolbars();
-        return;
+        return true;
     }
 
     /* Avoid more than one via on the current location: */
     if( Locate_Via( m_Pcb, g_CurrentTrackSegment->m_End, g_CurrentTrackSegment->GetLayer() ) )
-        return;
+        return false;
     
     pt_segm = g_FirstTrackSegment;
     for( ii = 0; ii < g_TrackSegmentCount - 1; ii++, pt_segm = (TRACK*) pt_segm->Pnext )
     {
         if( (pt_segm->Type() == TYPEVIA)
            && (g_CurrentTrackSegment->m_End == pt_segm->m_Start) )
-            return;
+            return false;
     }
 
     /* Is the current segment Ok (no DRC error) ? */
@@ -200,12 +191,12 @@ void WinEDA_PcbFrame::Other_Layer_Route( TRACK* track, wxDC* DC )
     {
         if( BAD_DRC==m_drc->Drc( g_CurrentTrackSegment, m_Pcb->m_Track ) )
             /* DRC error, the change layer is not made */
-            return;
+            return false;
             
         if( g_TwoSegmentTrackBuild && g_CurrentTrackSegment->Back() )    // We must handle 2 segments
         {
             if( BAD_DRC == m_drc->Drc( g_CurrentTrackSegment->Back(), m_Pcb->m_Track ) )
-                return;
+                return false;
         }
     }
 
@@ -256,7 +247,7 @@ void WinEDA_PcbFrame::Other_Layer_Route( TRACK* track, wxDC* DC )
         delete Via;
         GetScreen()->m_Active_Layer = old_layer;
         DrawPanel->ManageCurseur( DrawPanel, DC, FALSE );
-        return;
+        return false;
     }
 
     /* A new via was created. It was Ok.
@@ -303,6 +294,8 @@ void WinEDA_PcbFrame::Other_Layer_Route( TRACK* track, wxDC* DC )
 
     Affiche_Status_Box();
     SetToolbars();
+    
+    return true;
 }
 
 

pcbnew/move_or_drag_track.cpp

@@ -234,7 +234,9 @@ static void Show_Drag_Track_Segment_With_Cte_Slope( WinEDA_DrawPanel* panel,
 
     if( TrackSegWrapper == NULL )
         return;
-    Track = TrackSegWrapper->m_Segm; if( Track == NULL )
+    
+    Track = TrackSegWrapper->m_Segm; 
+    if( Track == NULL )
         return;
 
     TrackSegWrapper = TrackSegWrapper->Pnext;
@@ -260,6 +262,7 @@ static void Show_Drag_Track_Segment_With_Cte_Slope( WinEDA_DrawPanel* panel,
         Track->Draw( panel, DC, draw_mode );
         if( tSegmentToStart )
             tSegmentToStart->Draw( panel, DC, draw_mode );
+        
         if( tSegmentToEnd )
             tSegmentToEnd->Draw( panel, DC, draw_mode );
     }
@@ -386,11 +389,13 @@ static void Show_Drag_Track_Segment_With_Cte_Slope( WinEDA_DrawPanel* panel,
     // update the segment coordinates (if possible)
     if( tSegmentToStart == NULL )
     {
-        xi1 = tx1; yi1 = ty1;
+        xi1 = tx1; 
+        yi1 = ty1;
     }
     if( tSegmentToEnd == NULL )
     {
-        xi2 = tx2; yi2 = ty2;
+        xi2 = tx2; 
+        yi2 = ty2;
     }
 
 
@@ -736,6 +741,7 @@ void WinEDA_PcbFrame::Start_DragTrackSegmentAndKeepSlope( TRACK* track, wxDC* DC
         AddSegmentToDragList( DrawPanel, DC, flag, TrackToStartPoint );
         track->m_Flags |= STARTPOINT;
     }
+    
     if( TrackToEndPoint )
     {
         int flag = STARTPOINT;