1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
let use_ref initial =
let state, _ = Core.use_state (fun () -> ref initial) in
state
let use_ref_lazy init =
let state, _ = Core.use_state (fun () -> ref (init ())) in
state
let use_state initial = Core.use_state (fun () -> initial)
let use_state_lazy init = Core.use_state init
let use_reducer = Core.use_reducer
let use_resource ~on:deps ?(equal = ( = )) ?before_render ~release acquire =
let last_deps = use_ref deps in
let resource = use_ref None in
let release () = Option.iter release !resource in
let acquire () = resource := Some (acquire ()) in
let init () =
acquire ();
Some release
in
let update () =
if not (equal deps !last_deps) then begin
last_deps := deps;
release ();
acquire ()
end;
None
in
Core.use_effect_once ?before_render init;
Core.use_effect_always ?before_render update
let use_effect ~on ?equal ?before_render ?(cleanup = fun () -> ()) f =
use_resource ?before_render ~on ?equal ~release:cleanup f
let use_effect_once ?before_render ?cleanup f =
Core.use_effect_once ?before_render (fun () ->
f ();
cleanup)
let use_effect_always ?before_render ?cleanup f =
Core.use_effect_always ?before_render (fun () ->
f ();
cleanup)
let use_memo ~on:deps ?(equal = ( = )) f =
let last_deps = use_ref deps in
let value = use_ref_lazy (fun () -> f ()) in
if not (equal deps !last_deps) then begin
last_deps := deps;
value := f ()
end;
!value
let use_context = Core.use_context