pwa-helpers/connect-mixin.js

/**
@license
Copyright (c) 2018 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
Code distributed by Google as part of the polymer project is also
subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
*/
/**
  This is a JavaScript mixin that you can use to connect a Custom Element base
  class to a Redux store. The `stateChanged(state)` method will be called when
  the state is updated.

  Example:

      import { connect } from 'pwa-helpers/connect-mixin.js';

      class MyElement extends connect(store)(HTMLElement) {
        stateChanged(state) {
          this.textContent = state.data.count.toString();
        }
      }
*/
export const connect = (store) => (baseElement) => class extends baseElement {
    connectedCallback() {
        if (super.connectedCallback) {
            super.connectedCallback();
        }
        this._storeUnsubscribe = store.subscribe(() => this.stateChanged(store.getState()));
        this.stateChanged(store.getState());
    }
    disconnectedCallback() {
        this._storeUnsubscribe();
        if (super.disconnectedCallback) {
            super.disconnectedCallback();
        }
    }
    /**
     * The `stateChanged(state)` method will be called when the state is updated.
     */
    stateChanged(_state) { }
};
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