Function get_num_children

library/modules/Gui.cpp:277–284

}

static size_t get_num_children(df::widget * w) {
    if (!w)
        return 0;
    df::widget_container *container = virtual_cast<df::widget_container>(w);
    if (!container)
        return 0;
    return container->children.size();
}

static df::widget * get_visible_child(df::widget *parent) {
    df::widget_container *container = virtual_cast<df::widget_container>(parent);