+List::DataObserver::DataObserver(List &l):
+ list(l)
+{
+ list.data->signal_item_added.connect(sigc::mem_fun(this, &DataObserver::item_added));
+ list.data->signal_item_removed.connect(sigc::mem_fun(this, &DataObserver::item_removed));
+ list.data->signal_cleared.connect(sigc::mem_fun(this, &DataObserver::cleared));
+ list.data->signal_refresh_strings.connect(sigc::mem_fun(this, &DataObserver::refresh_strings));
+}
+
+void List::DataObserver::item_added(unsigned i)
+{
+ if(list.sel_index>=static_cast<int>(i))
+ ++list.sel_index;
+
+ list.items_changed();
+}
+
+void List::DataObserver::item_removed(unsigned i)
+{
+ if(list.sel_index>static_cast<int>(i))
+ --list.sel_index;
+ else if(list.sel_index==static_cast<int>(i))
+ list.sel_index = -1;
+
+ list.items_changed();
+}
+
+void List::DataObserver::cleared()
+{
+ list.sel_index = -1;
+ list.items_changed();
+}
+
+void List::DataObserver::refresh_strings()
+{
+ list.items_changed();
+}
+
+