react-native-gesture-handler/lib/module/handlers/utils.js

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

import { Platform, findNodeHandle as findNodeHandleRN } from 'react-native';
import { handlerIDToTag } from './handlersRegistry';
import { toArray } from '../utils';
import RNGestureHandlerModule from '../RNGestureHandlerModule';
import { ghQueueMicrotask } from '../ghQueueMicrotask';

function isConfigParam(param, name) {
  // param !== Object(param) returns false if `param` is a function
  // or an object and returns true if `param` is null
  return param !== undefined && (param !== Object(param) || !('__isNative' in param)) && name !== 'onHandlerStateChange' && name !== 'onGestureEvent';
}

export function filterConfig(props, validProps, defaults = {}) {
  const filteredConfig = { ...defaults
  };

  for (const key of validProps) {
    let value = props[key];

    if (isConfigParam(value, key)) {
      if (key === 'simultaneousHandlers' || key === 'waitFor') {
        value = transformIntoHandlerTags(props[key]);
      } else if (key === 'hitSlop' && typeof value !== 'object') {
        value = {
          top: value,
          left: value,
          bottom: value,
          right: value
        };
      }

      filteredConfig[key] = value;
    }
  }

  return filteredConfig;
}
export function transformIntoHandlerTags(handlerIDs) {
  handlerIDs = toArray(handlerIDs);

  if (Platform.OS === 'web') {
    return handlerIDs.map(({
      current
    }) => current).filter(handle => handle);
  } // converts handler string IDs into their numeric tags


  return handlerIDs.map(handlerID => {
    var _handlerID$current;

    return handlerIDToTag[handlerID] || ((_handlerID$current = handlerID.current) === null || _handlerID$current === void 0 ? void 0 : _handlerID$current.handlerTag) || -1;
  }).filter(handlerTag => handlerTag > 0);
}
export function findNodeHandle(node) {
  if (Platform.OS === 'web') {
    return node;
  }

  return findNodeHandleRN(node);
}
let flushOperationsScheduled = false;
export function scheduleFlushOperations() {
  if (!flushOperationsScheduled) {
    flushOperationsScheduled = true;
    ghQueueMicrotask(() => {
      RNGestureHandlerModule.flushOperations();
      flushOperationsScheduled = false;
    });
  }
}
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