Add support for units.

eeschema/class_libentry.cpp

@@ -64,7 +64,9 @@ int LIB_PART::m_subpartFirstId = 'A';
 
 LIB_ALIAS::LIB_ALIAS( const wxString& aName, LIB_PART* aRootPart ) :
     EDA_ITEM( LIB_ALIAS_T ),
-    shared( aRootPart )
+    shared( aRootPart ),
+    tmpUnit( 0 ),
+    tmpConversion( 0 )
 {
     SetName( aName );
 }
@@ -72,7 +74,9 @@ LIB_ALIAS::LIB_ALIAS( const wxString& aName, LIB_PART* aRootPart ) :
 
 LIB_ALIAS::LIB_ALIAS( const LIB_ALIAS& aAlias, LIB_PART* aRootPart ) :
     EDA_ITEM( aAlias ),
-    shared( aRootPart )
+    shared( aRootPart ),
+    tmpUnit( 0 ),
+    tmpConversion( 0 )
 {
     name   = aAlias.name;
 

eeschema/class_libentry.h

@@ -87,6 +87,9 @@ protected:
     wxString        keyWords;       ///< keyword list (used for search for parts by keyword)
     wxString        docFileName;    ///< Associate doc file name
 
+    int             tmpUnit;        ///< Temporary unit designator (used for rendering)
+    int             tmpConversion;  ///< Temporary conversion designator (used for rendering)
+
 public:
     LIB_ALIAS( const wxString& aName, LIB_PART* aRootComponent );
     LIB_ALIAS( const LIB_ALIAS& aAlias, LIB_PART* aRootComponent = NULL );
@@ -156,6 +159,18 @@ public:
      */
     wxString GetUnitReference( int aUnit ) override;
 
+    /**
+     * A temporary unit designation for rendering, preview, etc.
+     */
+    void SetTmpUnit( int aUnit ) { tmpUnit = aUnit; }
+    int GetTmpUnit() { return tmpUnit; }
+
+    /**
+     * A temporary conversion (deMorgan) designation for rendering, preview, etc.
+     */
+    void SetTmpConversion( int aConversion ) { tmpConversion = aConversion; }
+    int GetTmpConversion() { return tmpConversion; }
+
     /**
      * KEEPCASE sensitive comparison of the part entry name.
      */

eeschema/sch_painter.cpp

@@ -193,10 +193,8 @@ void SCH_PAINTER::draw( LIB_PART *aComp, int aLayer, bool aDrawFields, int aUnit
 void SCH_PAINTER::draw( LIB_ALIAS *aAlias, int aLayer )
 {
     LIB_PART* comp = aAlias->GetPart();
-    int unit = 0;
-    int convert = 0;
 
-    draw( comp, aLayer, false, unit, convert );
+    draw( comp, aLayer, false, aAlias->GetTmpUnit(), aAlias->GetTmpConversion() );
 
     LIB_FIELDS fields;
     comp->GetFields( fields );

eeschema/sch_preview_panel.cpp

@@ -44,7 +44,7 @@ using namespace std::placeholders;
 SCH_PREVIEW_PANEL::SCH_PREVIEW_PANEL( wxWindow* aParentWindow, wxWindowID aWindowId,
                                       const wxPoint& aPosition, const wxSize& aSize,
                                       KIGFX::GAL_DISPLAY_OPTIONS& aOptions, GAL_TYPE aGalType ) :
-    EDA_DRAW_PANEL_GAL( aParentWindow, aWindowId, aPosition, aSize, aOptions, GAL_TYPE_OPENGL ),
+    EDA_DRAW_PANEL_GAL( aParentWindow, aWindowId, aPosition, aSize, aOptions, aGalType ),
     m_parent( aParentWindow )
 {
     m_view = new KIGFX::SCH_VIEW( true );

eeschema/widgets/symbol_preview_widget.cpp

@@ -89,7 +89,14 @@ void SYMBOL_PREVIEW_WIDGET::DisplaySymbol( const LIB_ID& aSymbolID, int aUnit )
 
     if( alias )
     {
-        // JEY TODO: how to communicate unit to drawing code?
+        LIB_PART* part = alias->GetPart();
+
+        // If unit isn't specified for a multi-unit part, pick the first.  (Otherwise we'll
+        // draw all of them.)
+        if( part->IsMulti() && aUnit == 0 )
+            aUnit = 1;
+
+        alias->SetTmpUnit( aUnit );
         view->Add( alias );
 
         // Zoom to fit