WIP: undo/redo for applying a technology.

src/laybasic/laybasic/layCellView.cc

@@ -59,6 +59,8 @@ LayoutHandle::LayoutHandle (db::Layout *layout, const std::string &filename)
     m_dirty (false),
     m_save_options_valid (false)
 {
+  layout->technology_changed_event.add (this, &LayoutHandle::on_technology_changed);
+
   //  layouts in the managed layouts space participate in spare proxy cleanup
   layout->do_cleanup (true);
 
@@ -108,6 +110,12 @@ LayoutHandle::~LayoutHandle ()
   file_watcher ().remove_file (filename ());
 }
 
+void
+LayoutHandle::on_technology_changed ()
+{
+  technology_changed_event ();
+}
+
 void 
 LayoutHandle::layout_changed ()
 {
@@ -232,7 +240,6 @@ LayoutHandle::set_tech_name (const std::string &tn)
 {
   if (mp_layout && tn != tech_name ()) {
     mp_layout->set_technology_name (tn);
-    technology_changed_event ();
   }
 }
 

src/laybasic/laybasic/layCellView.h

@@ -302,6 +302,8 @@ private:
   bool m_save_options_valid;
   db::LoadLayoutOptions m_load_options;
 
+  void on_technology_changed ();
+
   static std::map <std::string, LayoutHandle *> ms_dict;
   static tl::FileSystemWatcher *mp_file_watcher;
 };