+
+void Selection::select_blocks()
+{
+ bool changed = false;
+ for(set<Track *>::iterator i=tracks.begin(); i!=tracks.end(); ++i)
+ {
+ const set<Track *> &btracks = (*i)->get_block().get_tracks();
+ for(set<Track *>::iterator j=btracks.begin(); j!=btracks.end(); ++j)
+ if(!tracks.count(*j))
+ {
+ tracks.insert(*j);
+ changed = true;
+ }
+ }
+
+ if(changed)
+ signal_changed.emit();
+}