Eeschema: Fix some issues (all connections showed as not connected, DRC and NETLIST errors if all sheets in a hierarchy were not open) due to the fact the pointer of a schematic component to its part lib was calculated too late (or never calculated).

eeschema/files-io.cpp

@@ -277,6 +277,13 @@ bool SCH_EDIT_FRAME::OpenProjectFiles( const std::vector<wxString>& aFileSet, in
 
     LoadProjectFile();
 
+    // load the libraries here, not in SCH_SCREEN::Draw() which is a context
+    // that will not tolerate DisplayError() dialog since we're already in an
+    // event handler in there.
+    // And when a schematic file is loaded, we need these libs to initialize
+    // some parameters (links to PART LIB, dangling ends ...)
+    Prj().SchLibs();
+
     if( is_new )
     {
         // mark new, unsaved file as modified.
@@ -302,15 +309,6 @@ bool SCH_EDIT_FRAME::OpenProjectFiles( const std::vector<wxString>& aFileSet, in
     Zoom_Automatique( false );
     SetSheetNumberAndCount();
 
-    /* this is done in ReDraw()
-    UpdateTitle();
-    */
-
-    // load the libraries here, not in SCH_SCREEN::Draw() which is a context
-    // that will not tolerate DisplayError() dialog since we're already in an
-    // event handler in there.
-    Prj().SchLibs();
-
     m_canvas->Refresh( true );
 
     return true;
@@ -363,6 +361,7 @@ bool SCH_EDIT_FRAME::AppendOneEEProject()
 
     // load the project
     bool success = LoadOneEEFile( screen, fullFileName, true );
+
     if( success )
     {
         // load sub-sheets

eeschema/load_one_schematic_file.cpp

@@ -260,6 +260,7 @@ again." );
     aScreen->Show( 0, std::cout );
 #endif
 
+    aScreen->BuildSchCmpLinksToLibCmp();    // Build links between each components and its part lib LIB_PART
     aScreen->TestDanglingEnds();
 
     msgDiag.Printf( _( "Done Loading <%s>" ), GetChars( aScreen->GetFileName() ) );

eeschema/sch_screen.cpp

@@ -546,13 +546,11 @@ bool SCH_SCREEN::Save( FILE* aFile ) const
     return true;
 }
 
-
-void SCH_SCREEN::Draw( EDA_DRAW_PANEL* aCanvas, wxDC* aDC, GR_DRAWMODE aDrawMode, EDA_COLOR_T aColor )
+void SCH_SCREEN::BuildSchCmpLinksToLibCmp()
 {
-    /* note: SCH_SCREEN::Draw is useful only for schematic.
-     * library editor and library viewer do not use m_drawList, and therefore
-     * their SCH_SCREEN::Draw() draws nothing
-     */
+    // Initialize or reinitialize the pointer to the LIB_PART for each component
+    // found in m_drawList, but only if needed (change in lib or schematic)
+    // therefore the calculation time is usually very low.
 
     if( m_drawList.GetCount() )
     {
@@ -571,6 +569,18 @@ void SCH_SCREEN::Draw( EDA_DRAW_PANEL* aCanvas, wxDC* aDC, GR_DRAWMODE aDrawMode
             m_modification_sync = mod_hash;     // note the last mod_hash
         }
     }
+}
+
+
+
+void SCH_SCREEN::Draw( EDA_DRAW_PANEL* aCanvas, wxDC* aDC, GR_DRAWMODE aDrawMode, EDA_COLOR_T aColor )
+{
+    /* note: SCH_SCREEN::Draw is useful only for schematic.
+     * library editor and library viewer do not use m_drawList, and therefore
+     * their SCH_SCREEN::Draw() draws nothing
+     */
+
+    BuildSchCmpLinksToLibCmp();
 
     for( SCH_ITEM* item = m_drawList.begin(); item; item = item->Next() )
     {
@@ -592,6 +602,8 @@ void SCH_SCREEN::Draw( EDA_DRAW_PANEL* aCanvas, wxDC* aDC, GR_DRAWMODE aDrawMode
  */
 void SCH_SCREEN::Plot( PLOTTER* aPlotter )
 {
+    BuildSchCmpLinksToLibCmp();
+
     for( SCH_ITEM* item = m_drawList.begin();  item;  item = item->Next() )
     {
         aPlotter->SetCurrentLineWidth( item->GetPenSize() );
@@ -1395,6 +1407,13 @@ void SCH_SCREENS::BuildScreenList( EDA_ITEM* aItem )
     if( aItem && aItem->Type() == SCH_SCREEN_T )
     {
         SCH_SCREEN*     screen = (SCH_SCREEN*) aItem;
+
+        // Ensure each component has its pointer to its part lib LIB_PART
+        // up to date (the cost is low if this is the case)
+        // We do this update here, because most of time this function is called
+        // to create a netlist, or an ERC, which need this update
+        screen->BuildSchCmpLinksToLibCmp();
+
         AddScreenToList( screen );
         EDA_ITEM* strct = screen->GetDrawItems();
 

include/class_sch_screen.h

@@ -193,6 +193,16 @@ public:
 
     void Place( SCH_EDIT_FRAME* frame, wxDC* DC ) { };
 
+    /**
+     * Initialize or reinitialize the pointer
+     * to the LIB_PART for each component found in m_drawList
+     * must be called:
+     *  in Draw function
+     *  when loading a schematic file
+     *  before creating a netlist (in case a library is modified)
+     */
+    void BuildSchCmpLinksToLibCmp();
+
     /**
      * Function Draw
      * draws all the items in the screen to \a aCanvas.