ocarina: Freeze and thaw the liststore while filling

This causes fewer refreshes of the liststore and speeds up filling it
in.

ocarina/songlist/songlist.cpp

@@ -85,6 +85,18 @@ GtkWidget *SongList::get_label()
 	return label;
 }
 
+void SongList::freeze()
+{
+	gtk_widget_freeze_child_notify(treeview);
+	gtk_tree_view_set_model(GTK_TREE_VIEW(treeview), NULL);
+}
+
+void SongList::thaw()
+{
+	gtk_widget_thaw_child_notify(treeview);
+	gtk_tree_view_set_model(GTK_TREE_VIEW(treeview), GTK_TREE_MODEL(liststore));
+}
+
 void SongList::clear()
 {
 	gtk_list_store_clear(liststore);
@@ -96,6 +108,7 @@ void SongList::insert(list<Track> &track_list)
 	Track *track;
 	list<Track>::iterator it;
 
+	freeze();
 	for (it = track_list.begin(); it != track_list.end(); it++) {
 		track = &(*it);
 		gtk_list_store_insert_with_values(liststore, NULL, ins_next,
@@ -109,4 +122,5 @@ void SongList::insert(list<Track> &track_list)
 				-1);
 		ins_next++;
 	}
+	thaw();
 }

ocarina/songlist/songlist.h

@@ -19,6 +19,8 @@ class SongList
 		GtkCellRenderer *text_cell;
 
 		void add_column(unsigned int);
+		void freeze();
+		void thaw();
 
 	public:
 		SongList();