Draft web platform structure

src/platform_impl/web/event_loop/state.rs

@@ -0,0 +1,42 @@
+use super::backend;
+use crate::event_loop::ControlFlow;
+
+use instant::Instant;
+
+#[derive(Debug, Clone, Copy)]
+pub enum State {
+    Init,
+    WaitUntil {
+        timeout: backend::Timeout,
+        start: Instant,
+        end: Instant,
+    },
+    Wait {
+        start: Instant,
+    },
+    Poll {
+        timeout: backend::Timeout,
+    },
+    Exit,
+}
+
+impl State {
+    pub fn is_exit(&self) -> bool {
+        match self {
+            State::Exit => true,
+            _ => false,
+        }
+    }
+}
+
+impl From<State> for ControlFlow {
+    fn from(state: State) -> ControlFlow {
+        match state {
+            State::Init => ControlFlow::Poll,
+            State::WaitUntil { end, .. } => ControlFlow::WaitUntil(end),
+            State::Wait { .. } => ControlFlow::Wait,
+            State::Poll { .. } => ControlFlow::Poll,
+            State::Exit => ControlFlow::Exit,
+        }
+    }
+}