Added preference for selecting tracks/vias/graphics if there is a module...

Added preference for selecting tracks/vias/graphics if there is a module present in the selection point.

pcbnew/tools/selection_tool.cpp

@@ -227,6 +227,7 @@ bool SELECTION_TOOL::selectSingle( const VECTOR2I& aWhere, bool aAllowDisambigua
     BOARD_ITEM* item;
     GENERAL_COLLECTORS_GUIDE guide = getEditFrame<PCB_EDIT_FRAME>()->GetCollectorsGuide();
     GENERAL_COLLECTOR collector;
+    const KICAD_T types[] = { PCB_TRACE_T, PCB_VIA_T, PCB_LINE_T, EOT }; // preferred types
 
     collector.Collect( pcb, GENERAL_COLLECTOR::AllBoardItems,
                        wxPoint( aWhere.x, aWhere.y ), guide );
@@ -252,6 +253,14 @@ bool SELECTION_TOOL::selectSingle( const VECTOR2I& aWhere, bool aAllowDisambigua
                 collector.Remove( i );
         }
 
+        // Check if among the selection candidates there is only one instance of preferred type
+        if( item = prefer( collector, types ) )
+        {
+            toggleSelection( item );
+
+            return true;
+        }
+
         // Let's see if there is still disambiguation in selection..
         if( collector.GetCount() == 1 )
         {
@@ -681,6 +690,38 @@ void SELECTION_TOOL::highlightNet( const VECTOR2I& aPoint )
 }
 
 
+BOARD_ITEM* SELECTION_TOOL::prefer( GENERAL_COLLECTOR& aCollector, const KICAD_T aTypes[] ) const
+{
+    BOARD_ITEM* preferred = NULL;
+
+    int typesNr = 0;
+    while( aTypes[typesNr++] != EOT );      // count number of types, excluding the sentinel (EOT)
+
+    for( int i = 0; i < aCollector.GetCount(); ++i )
+    {
+        KICAD_T type = aCollector[i]->Type();
+
+        for( int j = 0; j < typesNr - 1; ++j )      // Check if the item's type is in our list
+        {
+            if( aTypes[j] == type )
+            {
+                if( preferred == NULL )
+                {
+                    preferred = aCollector[i];  // save the first matching item
+                    break;
+                }
+                else
+                {
+                    return NULL;  // there is more than one preferred item, so there is no clear choice
+                }
+            }
+        }
+    }
+
+    return preferred;
+}
+
+
 void SELECTION_TOOL::SELECTION::clear()
 {
     items.ClearItemsList();

pcbnew/tools/selection_tool.h

@@ -229,6 +229,16 @@ private:
      */
     void highlightNet( const VECTOR2I& aPoint );
 
+    /**
+     * Function prefer()
+     * Checks if collector's list contains only single entry of asked types. If so, it returns it.
+     * @param aCollector is the collector that has a list of items to be queried.
+     * @param aTypes is the list of searched/preferred types.
+     * @return Pointer to the preferred item, if there is only one entry of given type or NULL
+     * if there are more entries or no entries at all.
+     */
+    BOARD_ITEM* prefer( GENERAL_COLLECTOR& aCollector, const KICAD_T aTypes[] ) const;
+
     /// Visual representation of selection box
     SELECTION_AREA* m_selArea;