1 | "use strict";
|
2 |
|
3 | exports.__esModule = true;
|
4 | exports.default = useThrottledEventHandler;
|
5 |
|
6 | var _react = require("react");
|
7 |
|
8 | var _useMounted = _interopRequireDefault(require("./useMounted"));
|
9 |
|
10 | var _useEventCallback = _interopRequireDefault(require("./useEventCallback"));
|
11 |
|
12 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
|
13 |
|
14 | function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }
|
15 |
|
16 | var isSyntheticEvent = function isSyntheticEvent(event) {
|
17 | return typeof event.persist === 'function';
|
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 | function useThrottledEventHandler(handler) {
|
50 | var isMounted = (0, _useMounted.default)();
|
51 | var eventHandler = (0, _useEventCallback.default)(handler);
|
52 | var nextEventInfoRef = (0, _react.useRef)({
|
53 | event: null,
|
54 | handle: null
|
55 | });
|
56 |
|
57 | var clear = function clear() {
|
58 | cancelAnimationFrame(nextEventInfoRef.current.handle);
|
59 | nextEventInfoRef.current.handle = null;
|
60 | };
|
61 |
|
62 | var handlePointerMoveAnimation = function handlePointerMoveAnimation() {
|
63 | var next = nextEventInfoRef.current;
|
64 |
|
65 | if (next.handle && next.event) {
|
66 | if (isMounted()) {
|
67 | next.handle = null;
|
68 | eventHandler(next.event);
|
69 | }
|
70 | }
|
71 |
|
72 | next.event = null;
|
73 | };
|
74 |
|
75 | var throttledHandler = function throttledHandler(event) {
|
76 | if (!isMounted()) return;
|
77 |
|
78 | if (isSyntheticEvent(event)) {
|
79 | event.persist();
|
80 | }
|
81 |
|
82 | else if ('evt' in event) {
|
83 | event = _extends({}, event);
|
84 | }
|
85 |
|
86 | nextEventInfoRef.current.event = event;
|
87 |
|
88 | if (!nextEventInfoRef.current.handle) {
|
89 | nextEventInfoRef.current.handle = requestAnimationFrame(handlePointerMoveAnimation);
|
90 | }
|
91 | };
|
92 |
|
93 | throttledHandler.clear = clear;
|
94 | return throttledHandler;
|
95 | } |
\ | No newline at end of file |