Schematic fields: implement fields with variables as names

Special case that always fills in the value with the value of the
variable

eeschema/dialogs/dialog_field_properties.cpp

@@ -500,7 +500,7 @@ DIALOG_SCH_FIELD_PROPERTIES::DIALOG_SCH_FIELD_PROPERTIES( SCH_BASE_FRAME* aParen
 
     init();
 
-    if( m_isSheetFilename )
+    if( m_isSheetFilename || m_field->IsNamedVariable() )
     {
         m_StyledTextCtrl->Enable( false );
         m_TextCtrl->Enable( false );

eeschema/dialogs/dialog_symbol_fields_table.cpp

@@ -341,6 +341,11 @@ void DIALOG_SYMBOL_FIELDS_TABLE::SetupColumnProperties()
             m_grid->SetColAttr( col, attr );
             m_grid->SetColFormatNumber( col );
         }
+        else if( m_dataModel->GetColFieldName( col ).StartsWith( wxS( "${" ) ) )
+        {
+            attr->SetReadOnly();
+            m_grid->SetColAttr( col, attr );
+        }
         else
         {
             attr->SetEditor( m_grid->GetDefaultEditor() );
@@ -574,14 +579,15 @@ void DIALOG_SYMBOL_FIELDS_TABLE::LoadFieldNames()
     }
 
     for( const wxString& fieldName : userFieldNames )
-        AddField( fieldName, fieldName, true, false );
+        AddField( fieldName, GetTextVars( fieldName ), true, false );
 
     // Add any templateFieldNames which aren't already present in the userFieldNames
     for( const TEMPLATE_FIELDNAME& templateFieldname :
          m_schSettings.m_TemplateFieldNames.GetTemplateFieldNames() )
     {
         if( userFieldNames.count( templateFieldname.m_Name ) == 0 )
-            AddField( templateFieldname.m_Name, templateFieldname.m_Name, false, false );
+            AddField( templateFieldname.m_Name, GetTextVars( templateFieldname.m_Name ), false,
+                      false );
     }
 }
 
@@ -611,7 +617,7 @@ void DIALOG_SYMBOL_FIELDS_TABLE::OnAddField( wxCommandEvent& event )
         }
     }
 
-    AddField( fieldName, fieldName, true, false, true );
+    AddField( fieldName, GetTextVars( fieldName ), true, false, true );
 
     wxGridCellAttr* attr = new wxGridCellAttr;
     m_grid->SetColAttr( m_dataModel->GetColsCount() - 1, attr );
@@ -1536,7 +1542,7 @@ void DIALOG_SYMBOL_FIELDS_TABLE::doApplyBomPreset( const BOM_PRESET& aPreset )
 
         // Properties like label, etc. will be added in the next loop
         if( !found )
-            AddField( fieldName, fieldName, false, false );
+            AddField( fieldName, GetTextVars( fieldName ), false, false );
     }
 
     // Sync all fields

eeschema/eeschema_jobs_handler.cpp

@@ -19,6 +19,7 @@
  */
 
 #include "eeschema_jobs_handler.h"
+#include <common.h>
 #include <pgm_base.h>
 #include <cli/exit_codes.h>
 #include <sch_plotter.h>
@@ -301,14 +302,15 @@ int EESCHEMA_JOBS_HANDLER::JobExportBom( JOB* aJob )
     }
 
     for( const wxString& fieldName : userFieldNames )
-        dataModel.AddColumn( fieldName, fieldName, true );
+        dataModel.AddColumn( fieldName, GetTextVars( fieldName ), true );
 
     // Add any templateFieldNames which aren't already present in the userFieldNames
     for( const TEMPLATE_FIELDNAME& templateFieldname :
          sch->Settings().m_TemplateFieldNames.GetTemplateFieldNames() )
     {
         if( userFieldNames.count( templateFieldname.m_Name ) == 0 )
-            dataModel.AddColumn( templateFieldname.m_Name, templateFieldname.m_Name, false );
+            dataModel.AddColumn( templateFieldname.m_Name, GetTextVars( templateFieldname.m_Name ),
+                                 false );
     }
 
     BOM_PRESET preset;

eeschema/sch_field.cpp

@@ -61,12 +61,12 @@ SCH_FIELD::SCH_FIELD( const VECTOR2I& aPos, int aFieldId, SCH_ITEM* aParent,
     SCH_ITEM( aParent, SCH_FIELD_T ),
     EDA_TEXT( schIUScale, wxEmptyString ),
     m_id( 0 ),
-    m_name( aName ),
     m_showName( false ),
     m_allowAutoPlace( true ),
     m_renderCacheValid( false ),
     m_lastResolvedColor( COLOR4D::UNSPECIFIED )
 {
+    SetName( aName );
     SetTextPos( aPos );
     SetId( aFieldId );  // will also set the layer
     SetVisible( false );
@@ -87,6 +87,7 @@ SCH_FIELD::SCH_FIELD( const SCH_FIELD& aField ) :
     m_name           = aField.m_name;
     m_showName       = aField.m_showName;
     m_allowAutoPlace = aField.m_allowAutoPlace;
+    m_isNamedVariable = aField.m_isNamedVariable;
 
     m_renderCache.clear();
 
@@ -111,6 +112,7 @@ SCH_FIELD& SCH_FIELD::operator=( const SCH_FIELD& aField )
     m_name            = aField.m_name;
     m_showName        = aField.m_showName;
     m_allowAutoPlace  = aField.m_allowAutoPlace;
+    m_isNamedVariable = aField.m_isNamedVariable;
 
     m_renderCache.clear();
 
@@ -172,6 +174,12 @@ void SCH_FIELD::SetId( int aId )
 }
 
 
+wxString SCH_FIELD::GetShownName() const
+{
+    return m_isNamedVariable ? GetTextVars( GetName() ) : GetName();
+}
+
+
 wxString SCH_FIELD::GetShownText( const SCH_SHEET_PATH* aPath, bool aAllowExtraText,
                                   int aDepth ) const
 {
@@ -197,7 +205,7 @@ wxString SCH_FIELD::GetShownText( const SCH_SHEET_PATH* aPath, bool aAllowExtraT
     wxString text = EDA_TEXT::GetShownText( aAllowExtraText, aDepth );
 
     if( IsNameShown() && aAllowExtraText )
-        text = GetName() << wxS( ": " ) << text;
+        text = GetShownName() << wxS( ": " ) << text;
 
     if( text == wxS( "~" ) ) // Legacy placeholder for empty string
     {
@@ -417,6 +425,7 @@ void SCH_FIELD::SwapData( SCH_ITEM* aItem )
     std::swap( m_layer, item->m_layer );
     std::swap( m_showName, item->m_showName );
     std::swap( m_allowAutoPlace, item->m_allowAutoPlace );
+    std::swap( m_isNamedVariable, item->m_isNamedVariable );
     SwapText( *item );
     SwapAttributes( *item );
 
@@ -835,6 +844,27 @@ void SCH_FIELD::DoHypertextAction( EDA_DRAW_FRAME* aFrame ) const
 }
 
 
+void SCH_FIELD::SetName( const wxString& aName )
+{
+    m_name = aName;
+    m_isNamedVariable = m_name.StartsWith( wxT( "${" ) );
+
+    if( m_isNamedVariable )
+        EDA_TEXT::SetText( aName );
+}
+
+
+void SCH_FIELD::SetText( const wxString& aText )
+{
+    // Don't allow modification of text value when using named variables
+    // as field name.
+    if( m_isNamedVariable )
+        return;
+
+    EDA_TEXT::SetText( aText );
+}
+
+
 wxString SCH_FIELD::GetName( bool aUseDefaultName ) const
 {
     if( m_parent && m_parent->Type() == SCH_SYMBOL_T )
@@ -1163,5 +1193,17 @@ static struct SCH_FIELD_DESC
         propMgr.Mask( TYPE_HASH( SCH_FIELD ), TYPE_HASH( EDA_TEXT ), _HKI( "Visible" ) );
         propMgr.Mask( TYPE_HASH( SCH_FIELD ), TYPE_HASH( EDA_TEXT ), _HKI( "Width" ) );
         propMgr.Mask( TYPE_HASH( SCH_FIELD ), TYPE_HASH( EDA_TEXT ), _HKI( "Height" ) );
+
+        auto isNotNamedVariable =
+                []( INSPECTABLE* aItem ) -> bool
+                {
+                    if( SCH_FIELD* field = dynamic_cast<SCH_FIELD*>( aItem ) )
+                        return !field->IsNamedVariable();
+
+                    return true;
+                };
+
+        propMgr.OverrideWriteability( TYPE_HASH( SCH_FIELD ), TYPE_HASH( EDA_TEXT ), _HKI( "Text" ),
+                                      isNotNamedVariable );
     }
 } _SCH_FIELD_DESC;

eeschema/sch_field.h

@@ -114,7 +114,9 @@ public:
      */
     wxString GetCanonicalName() const;
 
-    void SetName( const wxString& aName ) { m_name = aName; }
+    void SetName( const wxString& aName );
+
+    void SetText( const wxString& aText ) override;
 
     /**
      * Get the initial name of the field set at creation (or set by SetName()).
@@ -126,6 +128,12 @@ public:
 
     void SetId( int aId );
 
+    /**
+     * Gets the fields name as displayed on the schematic or
+     * in the symbol fields table. This is either the same as GetName() or
+     * if the field has a variable for name, the variable namer with the ${} stripped.
+     */
+    wxString GetShownName() const;
     wxString GetShownText( const SCH_SHEET_PATH* aPath, bool aAllowExtraText,
                            int aDepth = 0 ) const;
 
@@ -163,6 +171,14 @@ public:
     bool IsNameShown() const { return m_showName; }
     void SetNameShown( bool aShown = true ) { m_showName = aShown; }
 
+    /**
+     * Named variables are fields whose names are variables like ${VAR}.
+     *
+     * The shown name of these fields is VAR and the value is resolved from
+     * ${VAR}
+     */
+    bool IsNamedVariable() const { return m_isNamedVariable; }
+
     bool CanAutoplace() const { return m_allowAutoPlace; }
     void SetCanAutoplace( bool aCanPlace ) { m_allowAutoPlace = aCanPlace; }
 
@@ -258,6 +274,8 @@ private:
 
     bool     m_showName;   ///< Render the field name in addition to its value
     bool     m_allowAutoPlace;  ///< This field can be autoplaced
+    bool     m_isNamedVariable; ///< If the field name is a variable name, e.g. ${DNP}
+                                ///< then the value field is forced to be the same as the name
 
     mutable bool                                        m_renderCacheValid;
     mutable VECTOR2I                                    m_renderCachePos;