1 | "use strict";
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3 | exports.__esModule = true;
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4 | exports.default = useThrottledEventHandler;
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5 | var _react = require("react");
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6 | var _useMounted = _interopRequireDefault(require("./useMounted"));
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7 | var _useEventCallback = _interopRequireDefault(require("./useEventCallback"));
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8 | function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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9 | const isSyntheticEvent = event => typeof event.persist === 'function';
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39 | function useThrottledEventHandler(handler) {
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40 | const isMounted = (0, _useMounted.default)();
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41 | const eventHandler = (0, _useEventCallback.default)(handler);
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42 | const nextEventInfoRef = (0, _react.useRef)({
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43 | event: null,
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44 | handle: null
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45 | });
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46 | const clear = () => {
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47 | cancelAnimationFrame(nextEventInfoRef.current.handle);
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48 | nextEventInfoRef.current.handle = null;
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49 | };
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50 | const handlePointerMoveAnimation = () => {
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51 | const {
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52 | current: next
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53 | } = nextEventInfoRef;
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54 | if (next.handle && next.event) {
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55 | if (isMounted()) {
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56 | next.handle = null;
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57 | eventHandler(next.event);
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58 | }
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59 | }
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60 | next.event = null;
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61 | };
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62 | const throttledHandler = event => {
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63 | if (!isMounted()) return;
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64 | if (isSyntheticEvent(event)) {
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65 | event.persist();
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66 | }
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69 | else if ('evt' in event) {
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70 | event = Object.assign({}, event);
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71 | }
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72 | nextEventInfoRef.current.event = event;
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73 | if (!nextEventInfoRef.current.handle) {
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74 | nextEventInfoRef.current.handle = requestAnimationFrame(handlePointerMoveAnimation);
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75 | }
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76 | };
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77 | throttledHandler.clear = clear;
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78 | return throttledHandler;
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79 | } |
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