react-native-gesture-handler/lib/module/v3/hooks/utils/eventHandlersUtils.js

Declarative API exposing native platform touch and gesture system to React Native

"use strict";

import { useMemo } from 'react';
import { CALLBACK_TYPE } from '../../../handlers/gestures/gesture';
import { TouchEventType } from '../../../TouchEventType';
export function useMemoizedGestureCallbacks(callbacks) {
  return useMemo(() => {
    const memoized = {};
    if (callbacks.onBegin) {
      memoized.onBegin = callbacks.onBegin;
    }
    if (callbacks.onActivate) {
      memoized.onActivate = callbacks.onActivate;
    }
    if (callbacks.onDeactivate) {
      memoized.onDeactivate = callbacks.onDeactivate;
    }
    if (callbacks.onFinalize) {
      memoized.onFinalize = callbacks.onFinalize;
    }
    if (callbacks.onUpdate) {
      memoized.onUpdate = callbacks.onUpdate;
    }
    if (callbacks.onTouchesDown) {
      memoized.onTouchesDown = callbacks.onTouchesDown;
    }
    if (callbacks.onTouchesMove) {
      memoized.onTouchesMove = callbacks.onTouchesMove;
    }
    if (callbacks.onTouchesUp) {
      memoized.onTouchesUp = callbacks.onTouchesUp;
    }
    if (callbacks.onTouchesCancel) {
      memoized.onTouchesCancel = callbacks.onTouchesCancel;
    }
    return memoized;
  }, [callbacks.onActivate, callbacks.onBegin, callbacks.onDeactivate, callbacks.onFinalize, callbacks.onTouchesCancel, callbacks.onTouchesDown, callbacks.onTouchesMove, callbacks.onTouchesUp, callbacks.onUpdate]);
}
function getHandler(type, callbacks) {
  'worklet';

  switch (type) {
    case CALLBACK_TYPE.BEGAN:
      return callbacks.onBegin;
    case CALLBACK_TYPE.START:
      return callbacks.onActivate;
    case CALLBACK_TYPE.UPDATE:
      return callbacks.onUpdate;
    // Animated event is handled in different place.
    case CALLBACK_TYPE.END:
      return callbacks.onDeactivate;
    case CALLBACK_TYPE.FINALIZE:
      return callbacks.onFinalize;
    case CALLBACK_TYPE.TOUCHES_DOWN:
      return callbacks.onTouchesDown;
    case CALLBACK_TYPE.TOUCHES_MOVE:
      return callbacks.onTouchesMove;
    case CALLBACK_TYPE.TOUCHES_UP:
      return callbacks.onTouchesUp;
    case CALLBACK_TYPE.TOUCHES_CANCEL:
      return callbacks.onTouchesCancel;
  }
}
export function touchEventTypeToCallbackType(eventType) {
  'worklet';

  switch (eventType) {
    case TouchEventType.TOUCHES_DOWN:
      return CALLBACK_TYPE.TOUCHES_DOWN;
    case TouchEventType.TOUCHES_MOVE:
      return CALLBACK_TYPE.TOUCHES_MOVE;
    case TouchEventType.TOUCHES_UP:
      return CALLBACK_TYPE.TOUCHES_UP;
    case TouchEventType.TOUCHES_CANCEL:
      return CALLBACK_TYPE.TOUCHES_CANCEL;
  }
  return CALLBACK_TYPE.UNDEFINED;
}
export function runCallback(type, callbacks, event) {
  'worklet';

  const handler = getHandler(type, callbacks);
  if (!handler) {
    return;
  }
  handler(event);
}
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