1use std::marker::PhantomData;
 2
 3use crate::Element;
 4
 5pub struct Stateless<E: Element<State = ()>, S> {
 6    element: E,
 7    parent_state_type: PhantomData<S>,
 8}
 9
10impl<E: Element<State = ()>, S: 'static> Element for Stateless<E, S> {
11    type State = S;
12    type FrameState = E::FrameState;
13
14    fn layout(
15        &mut self,
16        _: &mut Self::State,
17        cx: &mut crate::ViewContext<Self::State>,
18    ) -> anyhow::Result<(crate::LayoutId, Self::FrameState)> {
19        cx.erase_state(|cx| self.element.layout(&mut (), cx))
20    }
21
22    fn paint(
23        &mut self,
24        layout: crate::Layout,
25        _: &mut Self::State,
26        frame_state: &mut Self::FrameState,
27        cx: &mut crate::ViewContext<Self::State>,
28    ) -> anyhow::Result<()> {
29        cx.erase_state(|cx| self.element.paint(layout, &mut (), frame_state, cx))
30    }
31}