react-native-ui-lib/lib/components/SafeArea/SafeAreaInsetsManager.js

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import _remove from "lodash/remove";
import _forEach from "lodash/forEach";
/* eslint no-underscore-dangle: 0 */

import { NativeModules, NativeEventEmitter } from 'react-native';
let SafeAreaInsetsCache = null;
const NativeSafeAreaManager = NativeModules.SafeAreaManager;
class SafeAreaInsetsManager {
  _defaultInsets = {
    top: 0,
    left: 0,
    bottom: 0,
    right: 0
  };
  _safeAreaInsets = {
    top: 0,
    left: 0,
    bottom: 0,
    right: 0
  };
  _safeAreaChangedDelegates = [];
  constructor() {
    this.addSafeAreaChangedListener();
  }
  addSafeAreaChangedListener() {
    if (!NativeSafeAreaManager) {
      return;
    }
    const NativeSafeAreaEvents = new NativeEventEmitter(NativeSafeAreaManager);
    NativeSafeAreaEvents.addListener('SafeAreaInsetsDidChangeEvent', safeAreaInsets => {
      SafeAreaInsetsCache = safeAreaInsets;
      this._safeAreaInsets = SafeAreaInsetsCache;
      _forEach(this._safeAreaChangedDelegates, delegate => {
        if (delegate.onSafeAreaInsetsDidChangeEvent) {
          delegate.onSafeAreaInsetsDidChangeEvent(this._safeAreaInsets);
        } else {
          console.warn('ERROR', 'SafeAreaInsetsManager', 'safe area changed delegate was added, but it does not implement the onSafeAreaInsetsDidChangeEvent method'); //eslint-disable-line
        }
      });
    });
  }
  async _updateInsets() {
    if (NativeSafeAreaManager && SafeAreaInsetsCache === null) {
      SafeAreaInsetsCache = await NativeSafeAreaManager.getSafeAreaInsets();
      this._safeAreaInsets = SafeAreaInsetsCache;
    }
  }
  async getSafeAreaInsets() {
    await this._updateInsets();
    return this._safeAreaInsets;
  }
  addSafeAreaChangedDelegate(delegate) {
    this._safeAreaChangedDelegates.push(delegate);
  }
  removeSafeAreaChangedDelegate(delegateToRemove) {
    _remove(this._safeAreaChangedDelegates, currentDelegate => {
      return currentDelegate === delegateToRemove;
    });
  }
  get defaultInsets() {
    return this._defaultInsets;
  }
}
export default new SafeAreaInsetsManager();