Add feedback showing current router state to the message panel

Fixes https://gitlab.com/kicad/code/kicad/-/issues/8265

pcbnew/router/pns_kicad_iface.cpp

@@ -445,6 +445,9 @@ bool PNS_KICAD_IFACE_BASE::ImportSizes( PNS::SIZES_SETTINGS& aSizes, PNS::ITEM*
     if( bds.m_UseConnectedTrackWidth && aStartItem != nullptr )
     {
         found = inheritTrackWidth( aStartItem, &trackWidth );
+
+        if( found )
+            aSizes.SetWidthSource( _( "existing track" ) );
     }
 
     if( !found && bds.UseNetClassTrack() && aStartItem )
@@ -454,12 +457,24 @@ bool PNS_KICAD_IFACE_BASE::ImportSizes( PNS::SIZES_SETTINGS& aSizes, PNS::ITEM*
         {
             trackWidth = std::max( trackWidth, constraint.m_Value.Opt() );
             found = true;
+
+            if( trackWidth == constraint.m_Value.Opt() )
+                aSizes.SetWidthSource( constraint.m_RuleName );
+            else
+                aSizes.SetWidthSource( _( "board minimum width" ) );
         }
     }
 
     if( !found )
     {
         trackWidth = std::max( trackWidth, bds.GetCurrentTrackWidth() );
+
+        if( bds.UseNetClassTrack() )
+            aSizes.SetWidthSource( _( "netclass 'Default'" ) );
+        else if( trackWidth == bds.GetCurrentTrackWidth() )
+            aSizes.SetWidthSource( _( "user choice" ) );
+        else
+            aSizes.SetWidthSource( _( "board minimum width" ) );
     }
 
     aSizes.SetTrackWidth( trackWidth );

pcbnew/router/pns_sizes_settings.h

@@ -48,7 +48,8 @@ public:
             m_diffPairGap( 180000 ),
             m_diffPairViaGap( 180000 ),
             m_diffPairViaGapSameAsTraceGap( true ),
-            m_holeToHole( 0 )
+            m_holeToHole( 0 ),
+            m_widthSource()
     {};
 
     ~SIZES_SETTINGS() {};
@@ -103,6 +104,9 @@ public:
     void SetViaType( VIATYPE aViaType ) { m_viaType = aViaType; }
     VIATYPE ViaType() const { return m_viaType; }
 
+    wxString GetWidthSource() const { return m_widthSource; }
+    void SetWidthSource( const wxString& aSource ) { m_widthSource = aSource; }
+
 private:
     int     m_minClearance;
     int     m_trackWidth;
@@ -120,6 +124,8 @@ private:
     int     m_holeToHole;
 
     std::map<int, int> m_layerPairs;
+
+    wxString m_widthSource;
 };
 
 }

pcbnew/router/router_tool.cpp

@@ -1033,6 +1033,7 @@ bool ROUTER_TOOL::prepareInteractive()
     m_endItem = nullptr;
     m_endSnapPoint = m_startSnapPoint;
 
+    updateMessagePanel();
     frame()->UndoRedoBlock( true );
 
     return true;
@@ -1046,6 +1047,7 @@ bool ROUTER_TOOL::finishInteractive()
     m_startItem = nullptr;
     m_endItem   = nullptr;
 
+    updateMessagePanel();
     frame()->GetCanvas()->SetCurrentCursor( KICURSOR::ARROW );
     controls()->SetAutoPan( false );
     controls()->ForceCursorPosition( false );
@@ -1869,6 +1871,67 @@ int ROUTER_TOOL::onTrackViaSizeChanged( const TOOL_EVENT& aEvent )
 }
 
 
+void ROUTER_TOOL::updateMessagePanel()
+{
+    if( !m_router->RoutingInProgress() )
+    {
+        frame()->SetMsgPanel( board() );
+        return;
+    }
+
+    MSG_PANEL_ITEMS items;
+    PNS::SIZES_SETTINGS sizes( m_router->Sizes() );
+    PNS::RULE_RESOLVER* resolver   = m_iface->GetRuleResolver();
+    bool                isDiffPair = m_router->Mode() == PNS::ROUTER_MODE::PNS_MODE_ROUTE_DIFF_PAIR;
+
+    if( m_startItem && m_startItem->Net() > 0 )
+    {
+        wxString description = isDiffPair ? _( "Routing Diff Pair: %s" ) : _( "Routing Track: %s" );
+
+        NETINFO_ITEM* netInfo = board()->FindNet( m_startItem->Net() );
+        wxASSERT( netInfo );
+
+        items.emplace_back( wxString::Format( description, netInfo->GetNetname() ),
+                            wxString::Format( _( "Net Class: %s" ), netInfo->GetNetClassName() ) );
+    }
+    else
+    {
+        items.emplace_back( _( "Routing Track" ), _( "(no net)" ) );
+    }
+
+    EDA_UNITS units = frame()->GetUserUnits();
+
+    int width = isDiffPair ? sizes.DiffPairWidth() : sizes.TrackWidth();
+    items.emplace_back( wxString::Format( _( "Track Width: %s" ),
+                                          MessageTextFromValue( units, width ) ),
+                        wxString::Format( _( "(from %s)" ), sizes.GetWidthSource() ) );
+
+    if( m_startItem )
+    {
+        PNS::SEGMENT dummy;
+        dummy.SetNet( m_startItem->Net() );
+
+        PNS::CONSTRAINT constraint;
+
+        if( resolver->QueryConstraint( PNS::CONSTRAINT_TYPE::CT_CLEARANCE, &dummy, nullptr,
+                                       m_router->GetCurrentLayer(), &constraint ) )
+        {
+            items.emplace_back( wxString::Format( _( "Min Clearance: %s" ),
+                                        MessageTextFromValue( units, constraint.m_Value.Min() ) ),
+                                wxString::Format( _( "(from %s)" ), constraint.m_RuleName ) );
+        }
+    }
+
+    if( isDiffPair )
+    {
+        items.emplace_back( _( "Diff Pair Gap" ),
+                            MessageTextFromValue( units, sizes.DiffPairGap() ) );
+    }
+
+    frame()->SetMsgPanel( items );
+}
+
+
 void ROUTER_TOOL::setTransitions()
 {
     Go( &ROUTER_TOOL::SelectCopperLayerPair,  PCB_ACTIONS::selectLayerPair.MakeEvent() );

pcbnew/router/router_tool.h

@@ -73,6 +73,8 @@ private:
     bool finishInteractive();
     void saveRouterDebugLog();
 
+    void updateMessagePanel();
+
 private:
     std::shared_ptr<ACTION_MENU> m_diffPairMenu;
     std::shared_ptr<ACTION_MENU> m_trackViaMenu;