+void Panel::on_child_removed(Widget &wdg)
+{
+ if(layout)
+ {
+ layout->remove_widget(wdg);
+ signal_autosize_changed.emit();
+ }
+}
+
+
+Panel::Loader::Loader(Panel &p, map<string, Widget *> &m):
+ DataFile::DerivedObjectLoader<Panel, Widget::Loader>(p),
+ wdg_map(m),
+ last_widget(0)
+{
+ add("button", &Loader::child<Button>);
+ add("column", &Loader::arrangement<Column>);
+ add("constraint",&Loader::constraint);
+ add("draghandle",&Loader::child<DragHandle>);
+ add("dropdown", &Loader::child<Dropdown>);
+ add("entry", &Loader::child<Entry>);
+ add("expand", &Loader::expand);
+ add("ghost", &Loader::ghost);
+ add("gravity", &Loader::gravity);
+ add("grid", &Loader::grid);
+ add("hslider", &Loader::child<HSlider>);
+ add("image", &Loader::child<Image>);
+ add("indicator", &Loader::child<Indicator>);
+ add("label", &Loader::child<Label>);
+ add("layout", &Loader::layout);
+ add("list", &Loader::child<List>);
+ add("panel", &Loader::panel);
+ add("row", &Loader::arrangement<Row>);
+ add("stack", &Loader::arrangement<Stack>);
+ add("toggle", &Loader::child<Toggle>);
+ add("vslider", &Loader::child<VSlider>);
+}
+
+Layout &Panel::Loader::get_layout()
+{
+ if(!obj.layout)
+ obj.set_layout(new Layout);
+
+ return *obj.layout;
+}
+
+Widget &Panel::Loader::get_last_widget()
+{
+ if(!last_widget)
+ throw logic_error("no widget loaded");
+
+ return *last_widget;
+}
+
+template<typename T>
+void Panel::Loader::arrangement()
+{
+ T arr(get_layout());
+ ArrangedLoader<T> ldr(*this, arr);
+ load_sub_with(ldr);
+}
+
+template<typename T>
+void Panel::Loader::child(const string &n)
+{
+ RefPtr<T> chl = new T();
+ load_sub(*chl);
+ obj.add(*chl.get());
+ last_widget = wdg_map[n] = chl.release();
+}
+
+void Panel::Loader::constraint(Layout::ConstraintType type, const string &n)
+{
+ Widget &src = get_last_widget();
+ Widget &tgt = *get_item(wdg_map, n);
+ get_layout().add_constraint(src, type, tgt);
+}
+
+void Panel::Loader::expand(bool h, bool v)
+{
+ get_layout().set_expand(get_last_widget(), h, v);
+}
+
+void Panel::Loader::ghost(bool g)