Implemented a solution for #2180

Implements a new option to show/hide unresolved references
(ghost cells). The option is found in "Display/Cells"
in the Setup dialog and also in the View menu.

src/laybasic/laybasic/layLayoutViewBase.cc

@@ -343,6 +343,7 @@ LayoutViewBase::init (db::Manager *mgr)
   m_box_font = 0;
   m_min_size_for_label = 16;
   m_cell_box_visible = true;
+  m_ghost_cells_visible = true;
   m_text_visible = true;
   m_default_font_size = lay::FixedFont::default_font_size ();
   m_text_lazy_rendering = true;
@@ -958,6 +959,13 @@ LayoutViewBase::configure (const std::string &name, const std::string &value)
     cell_box_visible (flag);
     return true;
 
+  } else if (name == cfg_ghost_cells_visible) {
+
+    bool flag;
+    tl::from_string (value, flag);
+    ghost_cells_visible (flag);
+    return true;
+
   } else if (name == cfg_cell_box_color) {
 
     tl::Color color;
@@ -4328,7 +4336,7 @@ LayoutViewBase::set_view_ops ()
   }
 
   //  ghost cells
-  if (m_cell_box_visible) { // @@@
+  if (m_ghost_cells_visible) {
 
     lay::ViewOp vop, vopv;
 
@@ -5422,7 +5430,16 @@ LayoutViewBase::cell_box_visible (bool vis)
   }
 }
 
-void 
+void
+LayoutViewBase::ghost_cells_visible (bool vis)
+{
+  if (m_ghost_cells_visible != vis) {
+    m_ghost_cells_visible = vis;
+    update_content ();
+  }
+}
+
+void
 LayoutViewBase::text_font (unsigned int f)
 {
   if (m_text_font != f) {

src/laybasic/laybasic/layLayoutViewBase.h

@@ -1115,6 +1115,19 @@ public:
     return m_cell_box_visible;
   }
 
+  /**
+   *  @brief Visibility of ghost cells
+   */
+  void ghost_cells_visible (bool vis);
+
+  /**
+   *  @brief Visibility of ghost cells
+   */
+  bool ghost_cells_visible () const
+  {
+    return m_ghost_cells_visible;
+  }
+
   /**
    *  @brief Min instance label size setter
    */
@@ -2910,6 +2923,7 @@ private:
   unsigned int m_box_font;
   int m_min_size_for_label;
   bool m_cell_box_visible;
+  bool m_ghost_cells_visible;
 
   tl::Color m_marker_color;
   int m_marker_line_width;

src/laybasic/laybasic/layLayoutViewConfig.cc

@@ -59,6 +59,7 @@ public:
     options.push_back (std::pair<std::string, std::string> (cfg_cell_box_text_transform, "true"));
     options.push_back (std::pair<std::string, std::string> (cfg_cell_box_color, "auto"));
     options.push_back (std::pair<std::string, std::string> (cfg_cell_box_visible, "true"));
+    options.push_back (std::pair<std::string, std::string> (cfg_ghost_cells_visible, "true"));
     options.push_back (std::pair<std::string, std::string> (cfg_text_color, "auto"));
     options.push_back (std::pair<std::string, std::string> (cfg_text_visible, "true"));
     options.push_back (std::pair<std::string, std::string> (cfg_text_lazy_rendering, "true"));

src/laybasic/laybasic/layRedrawThreadWorker.cc

@@ -841,7 +841,7 @@ RedrawThreadWorker::draw_boxes_impl (bool drawing_context, db::cell_index_type c
     //  paint the box on this level
     draw_cell (drawing_context, level, trans, bbox, empty_cell, mp_layout->display_name (ci));
 
-  } else if (! for_ghosts && (level == m_to_level || (m_cv_index < int (m_hidden_cells.size ()) && m_hidden_cells [m_cv_index].find (ci) != m_hidden_cells [m_cv_index].end ()))) {
+  } else if (! for_ghosts && ! cell.is_ghost_cell () && (level == m_to_level || (m_cv_index < int (m_hidden_cells.size ()) && m_hidden_cells [m_cv_index].find (ci) != m_hidden_cells [m_cv_index].end ()))) {
 
     //  paint the box on this level
     draw_cell (drawing_context, level, trans, bbox, empty_cell, mp_layout->display_name (ci));
@@ -1003,7 +1003,7 @@ RedrawThreadWorker::draw_box_properties (bool drawing_context, db::cell_index_ty
 void
 RedrawThreadWorker::draw_box_properties_for_ghosts (bool drawing_context, db::cell_index_type ci, const db::CplxTrans &trans, const std::vector<db::Box> &vp, int level)
 {
-  draw_box_properties_impl (drawing_context, ci, trans, vp, level, false);
+  draw_box_properties_impl (drawing_context, ci, trans, vp, level, true);
 }
 
 void
@@ -1057,7 +1057,7 @@ RedrawThreadWorker::draw_box_properties_impl (bool drawing_context, db::cell_ind
     //  paint the box on this level
     draw_cell_properties (drawing_context, level, trans, bbox, prop_id);
 
-  } else if (! for_ghosts && (level == m_to_level || (m_cv_index < int (m_hidden_cells.size ()) && m_hidden_cells [m_cv_index].find (ci) != m_hidden_cells [m_cv_index].end ()))) {
+  } else if (! for_ghosts && ! cell.is_ghost_cell () && (level == m_to_level || (m_cv_index < int (m_hidden_cells.size ()) && m_hidden_cells [m_cv_index].find (ci) != m_hidden_cells [m_cv_index].end ()))) {
 
     //  paint the box on this level
     draw_cell_properties (drawing_context, level, trans, bbox, prop_id);

src/laybasic/laybasic/laybasicConfig.h

@@ -95,6 +95,7 @@ static const std::string cfg_cell_box_text_font ("inst-label-font");
 static const std::string cfg_cell_box_text_transform ("inst-label-transform");
 static const std::string cfg_cell_box_color ("inst-color");
 static const std::string cfg_cell_box_visible ("inst-visible");
+static const std::string cfg_ghost_cells_visible ("ghost-cells-visible");
 static const std::string cfg_text_color ("text-color");
 static const std::string cfg_text_visible ("text-visible");
 static const std::string cfg_text_lazy_rendering ("text-lazy-rendering");