Macro fltk::widget_extends

macro_rules! widget_extends {
    ($widget:ty, $base:ty, $member:tt) => { ... };
}

Defines a set of convenience functions for constructing and anchoring custom widgets. Usage: fltk::widget_extends!(CustomWidget, BaseWidget, member); It basically implements Deref and DerefMut on the custom widget, and adds the aforementioned methods. This means you can call widget methods directly, for e.x. custom_widget.set_color(enums::Color::Red). For your custom widget to be treated as a widget it would need dereferencing: group.add(&*custom_widget);