todo_list_root.rs

struct TodoListRoot<T: Data> {
    inner: WidgetPod<T, Box<dyn Widget<T>>>,
}

impl<T: Data> TodoListRoot<T> {
    fn new(inner: impl Widget<T> + 'static) -> Self {
        Self {
            inner: WidgetPod::new(inner).boxed(),
        }
    }
}

impl<T: Data + 'static> Widget<T> for TodoListRoot<T> {
    fn paint(&mut self, ctx: &mut PaintCtx, _state: &BaseState, data: &T, env: &Env) {
        self.inner.paint(ctx, data, env);
    }

    fn layout(&mut self, ctx: &mut LayoutCtx, bc: &BoxConstraints, data: &T, env: &Env) -> Size {
        self.inner.layout(ctx, &bc, data, env)
    }

    fn event(&mut self, ctx: &mut EventCtx, event: &Event, data: &mut T, env: &Env) {
        self.inner.event(ctx, event, data, env);
    }

    fn update(&mut self, ctx: &mut UpdateCtx, _old_data: Option<&T>, new_data: &T, env: &Env) {
        self.inner.update(ctx, new_data, env);
    }
}