kepler.gl/src/connect/with-local-selector.js

kepler.gl is a webgl based application to visualize large scale location data in the browser

// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

import React, {Component} from 'react';
import {createSelector} from 'reselect';
import KeplerGlContext from 'components/context';

const identity = state => state;

const mergeSelectors = (parentSelector, childSelector) => state =>
  childSelector(parentSelector(state));

// store the parent selector in the parent context
// and return the parent component
// when a selector is passed to a container component,
// it will be stored in the context and passed down to child components,
// as well as prop to the given component
const withLocalSelector = ParentComponent => {
  class WithConnectSelector extends Component {
    static contextType = KeplerGlContext;

    selectorFromContext = (_, ctx) => (ctx.selector ? ctx.selector : identity);
    selectorFromProps = (props, _) => (props.selector ? props.selector : identity);
    idFromProps = (props, _) => props.id;
    computedSelector = createSelector(
      this.selectorFromContext,
      this.selectorFromProps,
      (ctx, props) => mergeSelectors(ctx, props)
    );
    contextSelector = createSelector(this.computedSelector, this.idFromProps, (selector, id) => ({
      selector,
      id
    }));

    render() {
      const computedContext = this.contextSelector(this.props, this.context);
      return (
        <KeplerGlContext.Provider value={computedContext}>
          <ParentComponent {...this.props} selector={computedContext.selector} />
        </KeplerGlContext.Provider>
      );
    }
  }

  return WithConnectSelector;
};

export default withLocalSelector;