struct stacked_widget_implementation
{
    template<typename W>
    static widget* find(utils::const_clone_ref<stacked_widget, W> stack,
            const std::string& id,
            const bool must_be_active)
    {
        // Use base method if find-in-all-layer isn't set.
        if(!stack.find_in_all_layers_) {
            return stack.container_base::find(id, must_be_active);
        }

        widget* res = nullptr;

        for(unsigned i = 0; i < stack.get_layer_count(); ++i) {
            res = stack.get_layer_grid(i)->find(id, must_be_active);

            if(res) {
                break;
            }
        }

        if(!res) {
            res = stack.container_base::find(id, must_be_active);
        }

        return res;
    }
};