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| 1 | +import { |
| 2 | + createContext, |
| 3 | + EventHandler, |
| 4 | + SyntheticEvent, |
| 5 | + useContext, |
| 6 | + useEffect, |
| 7 | + useRef, |
| 8 | +} from 'react'; |
| 9 | + |
| 10 | +type HandledEvents = 'pointermove' | 'pointerdown' | 'pointerup' | 'click'; |
| 11 | + |
| 12 | +type Handler = EventHandler<SyntheticEvent<unknown>>; |
| 13 | + |
| 14 | +function createEvent() { |
| 15 | + const handlers: Handler[] = []; |
| 16 | + const add = (callback: Handler) => { |
| 17 | + handlers.push(callback); |
| 18 | + }; |
| 19 | + const remove = (callback: Handler) => { |
| 20 | + const idx = handlers.indexOf(callback); |
| 21 | + if (idx < 0) return; |
| 22 | + handlers.splice(idx, 1); |
| 23 | + }; |
| 24 | + const trigger = (ev: SyntheticEvent<unknown>) => { |
| 25 | + handlers.forEach((h) => h(ev)); |
| 26 | + }; |
| 27 | + return { add, remove, trigger }; |
| 28 | +} |
| 29 | + |
| 30 | +export default function useViewEvents() { |
| 31 | + const eventMap = useRef< |
| 32 | + Record<HandledEvents, ReturnType<typeof createEvent>> |
| 33 | + >({ |
| 34 | + pointermove: createEvent(), |
| 35 | + pointerdown: createEvent(), |
| 36 | + pointerup: createEvent(), |
| 37 | + click: createEvent(), |
| 38 | + }); |
| 39 | + |
| 40 | + const rootListeners = useRef({ |
| 41 | + onPointerDown: eventMap.current.pointerdown.trigger, |
| 42 | + onPointerUp: eventMap.current.pointerup.trigger, |
| 43 | + onPointerMove: eventMap.current.pointermove.trigger, |
| 44 | + onClick: eventMap.current.click.trigger, |
| 45 | + }); |
| 46 | + |
| 47 | + const registerEventListener = ( |
| 48 | + eventName: HandledEvents, |
| 49 | + callback: Handler |
| 50 | + ) => { |
| 51 | + const bus = eventMap.current[eventName]; |
| 52 | + if (!bus) { |
| 53 | + throw new Error(`${eventName} is not supported in useViewEvents`); |
| 54 | + } |
| 55 | + |
| 56 | + bus.add(callback); |
| 57 | + return () => bus.remove(callback); |
| 58 | + }; |
| 59 | + |
| 60 | + return { |
| 61 | + rootListeners: rootListeners.current, |
| 62 | + registerEventListener, |
| 63 | + }; |
| 64 | +} |
| 65 | + |
| 66 | +export type ViewEventRegistrar = ReturnType< |
| 67 | + typeof useViewEvents |
| 68 | +>['registerEventListener']; |
| 69 | + |
| 70 | +export const ViewEvents = createContext<ViewEventRegistrar | null>(null); |
| 71 | + |
| 72 | +export function useViewEventListener( |
| 73 | + eventName: HandledEvents, |
| 74 | + callback: Handler |
| 75 | +) { |
| 76 | + const registerEventListener = useContext<ViewEventRegistrar | null>( |
| 77 | + ViewEvents |
| 78 | + ); |
| 79 | + if (!registerEventListener) { |
| 80 | + throw new Error('useViewEventListener needs ViewEventRegistrar!'); |
| 81 | + } |
| 82 | + |
| 83 | + useEffect(() => { |
| 84 | + return registerEventListener(eventName, callback); |
| 85 | + }, [eventName, callback, registerEventListener]); |
| 86 | +} |
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