react-native-maps/lib/components/decorateMapComponent.js

React Native Mapview component for iOS + Android

import PropTypes from 'prop-types';
import {
  requireNativeComponent,
  NativeModules,
  Platform,
} from 'react-native';
import {
  PROVIDER_DEFAULT,
  PROVIDER_GOOGLE,
} from './ProviderConstants';

export const SUPPORTED = 'SUPPORTED';
export const USES_DEFAULT_IMPLEMENTATION = 'USES_DEFAULT_IMPLEMENTATION';
export const NOT_SUPPORTED = 'NOT_SUPPORTED';

export function getAirMapName(provider) {
  if (Platform.OS === 'android') return 'AIRMap';
  if (provider === PROVIDER_GOOGLE) return 'AIRGoogleMap';
  return 'AIRMap';
}

function getAirComponentName(provider, component) {
  return `${getAirMapName(provider)}${component}`;
}

export const contextTypes = {
  provider: PropTypes.string,
};

export const createNotSupportedComponent = message => () => {
  console.error(message); // eslint-disable-line no-console
  return null;
};

export const googleMapIsInstalled = !!NativeModules.UIManager[getAirMapName(PROVIDER_GOOGLE)];

export default function decorateMapComponent(Component, { componentType, providers }) {
  const components = {};

  const getDefaultComponent = () =>
    requireNativeComponent(getAirComponentName(null, componentType), Component);

  Component.contextTypes = contextTypes; // eslint-disable-line no-param-reassign

  // eslint-disable-next-line no-param-reassign
  Component.prototype.getAirComponent = function getAirComponent() {
    const provider = this.context.provider || PROVIDER_DEFAULT;
    if (components[provider]) return components[provider];

    if (provider === PROVIDER_DEFAULT) {
      components[PROVIDER_DEFAULT] = getDefaultComponent();
      return components[PROVIDER_DEFAULT];
    }

    const providerInfo = providers[provider];
    const platformSupport = providerInfo[Platform.OS];
    const componentName = getAirComponentName(provider, componentType);
    if (platformSupport === NOT_SUPPORTED) {
      components[provider] = createNotSupportedComponent(`react-native-maps: ${componentName} is not supported on ${Platform.OS}`); // eslint-disable-line max-len
    } else if (platformSupport === SUPPORTED) {
      if (provider !== PROVIDER_GOOGLE || (Platform.OS === 'ios' && googleMapIsInstalled)) {
        components[provider] = requireNativeComponent(componentName, Component);
      }
    } else { // (platformSupport === USES_DEFAULT_IMPLEMENTATION)
      if (!components[PROVIDER_DEFAULT]) components[PROVIDER_DEFAULT] = getDefaultComponent();
      components[provider] = components[PROVIDER_DEFAULT];
    }

    return components[provider];
  };

  Component.prototype.getUIManagerCommand = function getUIManagerCommand(name) {  // eslint-disable-line no-param-reassign,max-len
    return NativeModules.UIManager[getAirComponentName(this.context.provider, componentType)]
      .Commands[name];
  };

  Component.prototype.getMapManagerCommand = function getMapManagerCommand(name) { // eslint-disable-line no-param-reassign,max-len
    const airComponentName = `${getAirComponentName(this.context.provider, componentType)}Manager`;
    return NativeModules[airComponentName][name];
  };

  return Component;
}