DRAGGER needs to report it's nets.

Otherwise things like snapping don't work.

Fixes https://gitlab.com/kicad/code/kicad/issues/4147

pcbnew/router/pns_component_dragger.h

@@ -79,6 +79,11 @@ public:
      */
     NODE* CurrentNode() const override;
 
+    const std::vector<int> CurrentNets() const override
+    {
+        return std::vector<int>();
+    }
+
     /**
      * Function Traces()
      *

pcbnew/router/pns_drag_algo.h

@@ -43,13 +43,14 @@ class DRAG_ALGO : public ALGO_BASE
 {
 public:
     DRAG_ALGO( ROUTER* aRouter ) :
-        ALGO_BASE( aRouter ), m_world( nullptr )
+        ALGO_BASE( aRouter ),
+        m_world( nullptr )
     {
     }
 
-   ~DRAG_ALGO()
-   {
-   }
+    ~DRAG_ALGO()
+    {
+    }
 
     /**
      * Function SetWorld()
@@ -61,51 +62,52 @@ public:
         m_world = aWorld;
     }
 
+    /**
+     * Function Start()
+     *
+     * Starts routing a single track at point aP, taking item aStartItem as anchor
+     * (unless NULL). Returns true if a dragging operation has started.
+     */
+    virtual bool Start( const VECTOR2I& aP, ITEM_SET& aPrimitives ) = 0;
 
-       /**
-        * Function Start()
-        *
-        * Starts routing a single track at point aP, taking item aStartItem as anchor
-        * (unless NULL). Returns true if a dragging operation has started.
-        */
-       virtual bool Start( const VECTOR2I& aP, ITEM_SET& aPrimitives ) = 0;
+    /**
+     * Function Drag()
+     *
+     * Drags the current segment/corner/via to the point aP.
+     * @return true, if dragging finished with success.
+     */
+    virtual bool Drag( const VECTOR2I& aP ) = 0;
 
-       /**
-        * Function Drag()
-        *
-        * Drags the current segment/corner/via to the point aP.
-        * @return true, if dragging finished with success.
-        */
-       virtual bool Drag( const VECTOR2I& aP ) = 0;
+    /**
+     * Function FixRoute()
+     *
+     * Checks if the result of current dragging operation is correct
+     * and eventually commits it to the world.
+     * @return true, if dragging finished with success.
+     */
+    virtual bool FixRoute() = 0;
 
-       /**
-        * Function FixRoute()
-        *
-        * Checks if the result of current dragging operation is correct
-        * and eventually commits it to the world.
-        * @return true, if dragging finished with success.
-        */
-       virtual bool FixRoute() = 0;
+    /**
+     * Function CurrentNode()
+     *
+     * Returns the most recent world state, including all
+     * items changed due to dragging operation.
+     */
+    virtual NODE* CurrentNode() const = 0;
 
-       /**
-        * Function CurrentNode()
-        *
-        * Returns the most recent world state, including all
-        * items changed due to dragging operation.
-        */
-       virtual NODE* CurrentNode() const = 0;
+    virtual const std::vector<int> CurrentNets() const = 0;
 
-       /**
-        * Function Traces()
-        *
-        * Returns the set of dragged items.
-        */
-       virtual const ITEM_SET Traces() = 0;
+    /**
+     * Function Traces()
+     *
+     * Returns the set of dragged items.
+     */
+    virtual const ITEM_SET Traces() = 0;
 
-       virtual void SetMode( int aDragMode ) {};
+    virtual void SetMode( int aDragMode ) {};
 
 protected:
-        NODE*   m_world;
+    NODE*   m_world;
 
 };
 

pcbnew/router/pns_dragger.h

@@ -83,6 +83,11 @@ public:
      */
     NODE* CurrentNode() const override;
 
+    const std::vector<int> CurrentNets() const override
+    {
+        return std::vector<int>( 1, m_draggedLine.Net() );
+    }
+
     /**
      * Function Traces()
      *
@@ -107,25 +112,22 @@ private:
     void optimizeAndUpdateDraggedLine( LINE& dragged, SEG& aDraggedSeg, const VECTOR2I& aP );
 
 
-    VIA_HANDLE m_initialVia;
-    VIA_HANDLE m_draggedVia;
+    VIA_HANDLE             m_initialVia;
+    VIA_HANDLE             m_draggedVia;
 
-    NODE*    m_lastNode;
-    int      m_mode;
-    LINE     m_draggedLine;
-    //VIA*     m_draggedVia;
-    //LINE     m_lastValidDraggedLine;
+    NODE*                  m_lastNode;
+    int                    m_mode;
+    LINE                   m_draggedLine;
     std::unique_ptr<SHOVE> m_shove;
-    int      m_draggedSegmentIndex;
-    bool     m_dragStatus;
-    PNS_MODE m_currentMode;
-    ITEM_SET m_origViaConnections;
+    int                    m_draggedSegmentIndex;
+    bool                   m_dragStatus;
+    PNS_MODE               m_currentMode;
 
     ///< Contains the list of items that are currently modified by the dragger
-    ITEM_SET m_draggedItems;
+    ITEM_SET               m_draggedItems;
 
     ///< If true, moves the connection lines without maintaining 45° corners
-    bool     m_freeAngleMode;
+    bool                   m_freeAngleMode;
 };
 
 }

pcbnew/router/pns_router.cpp

@@ -507,6 +507,8 @@ const std::vector<int> ROUTER::GetCurrentNets() const
 {
     if( m_placer )
         return m_placer->CurrentNets();
+    else if( m_dragger )
+        return m_dragger->CurrentNets();
 
     return std::vector<int>();
 }