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open Js_of_ocaml
let optdef_to_string o =
match Js.Optdef.to_option o with
| Some v -> Int.to_string v
| None -> "undefined"
let () =
let html =
Js.Opt.get
(Dom_html.document##querySelector (Js.string "html"))
(fun _ -> assert false)
in
html##.onwheel :=
Dom.handler (fun (event : Dom_html.mousewheelEvent Js.t) ->
Console.console##debug event;
let deltaX = event##.deltaX in
let deltaY = event##.deltaY in
let deltaZ = event##.deltaZ in
let deltaMode = event##.deltaMode in
let wheelDelta = event##.wheelDelta in
let wheelDeltaX = event##.wheelDeltaX in
let wheelDeltaY = event##.wheelDeltaY in
Printf.printf "deltaX: %f; " (Js.to_float deltaX);
Printf.printf "deltaY: %f; " (Js.to_float deltaY);
Printf.printf "deltaZ: %f; " (Js.to_float deltaZ);
Printf.printf
"deltaMode: %s; "
(match deltaMode with
| Delta_pixel -> "Delta_pixel"
| Delta_line -> "Delta_line"
| Delta_page -> "Delta_page");
Printf.printf "wheelDelta: %d; " wheelDelta;
Printf.printf "wheelDeltaX: %s; " (optdef_to_string wheelDeltaX);
Printf.printf "wheelDeltaY: %s\n" (optdef_to_string wheelDeltaY);
Js._false)
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