1 files changed, 38 insertions, 0 deletions
diff --git a/lib/elements/timer.ml b/lib/elements/timer.ml
new file mode 100755
index 0000000..28516fc
--- /dev/null
+++ b/lib/elements/timer.ml
@@ -0,0 +1,38 @@
+open Brr_note_kit
+
+type t =
+  { mutable id : Brr.G.timer_id
+  ; send : float Note.E.send
+  ; mutable counter : Time.counter
+  }
+
+let create
+  : unit -> (t * Brr_note_kit.Time.span Note.E.t)
+  = fun () ->
+    let event, send = Note.E.create ()
+    and counter = (Time.counter ()) in
+    {id = (-1); send; counter}, event
+
+let stop
+  : t -> unit
+  = fun {id; _} ->
+    Brr.G.stop_timer id
+
+let start
+  : t -> float -> unit
+  = fun t d ->
+    let {id; send; _} = t in
+    t.counter <- Time.counter ();
+
+    Brr.G.stop_timer id;
+    let timer_id = Brr.G.set_interval
+        ~ms:(int_of_float @@ d *. 1000.)
+        (fun () ->
+
+           let span = Time.counter_value t.counter in
+           send span) in
+    t.id <- timer_id
+
+
+let delay : t -> float
+  = fun t -> Time.counter_value t.counter