@shopify/react-native-skia/lib/module/values/web/RNSkComputedValue.js

High-performance React Native Graphics using Skia

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

import { RNSkReadonlyValue } from "./RNSkReadonlyValue";
export class RNSkComputedValue extends RNSkReadonlyValue {
  constructor(callback, dependencies) {
    // Initialize dependencies - we can't call this yet, since
    // super if not called and it requires a start value to be set.
    const unsubscribers = [];
    const notifyUpdateRef = {
      current: undefined
    };
    dependencies.forEach(dep => {
      if (dep && typeof dep === "object" && "__typename__" in dep && "addListener" in dep) {
        unsubscribers.push(dep.addListener(() => {
          var _notifyUpdateRef$curr;

          return (_notifyUpdateRef$curr = notifyUpdateRef.current) === null || _notifyUpdateRef$curr === void 0 ? void 0 : _notifyUpdateRef$curr.call(notifyUpdateRef);
        }));
      }
    });
    super(callback());

    _defineProperty(this, "_callback", void 0);

    _defineProperty(this, "_unsubscribers", void 0);

    this._unsubscribers = unsubscribers;
    notifyUpdateRef.current = this.dependecyUpdated.bind(this);
    this._callback = callback;
  }

  dependecyUpdated() {
    this.update(this._callback());
  }

  unsubscribe() {
    this._unsubscribers.forEach(unsubscribe => unsubscribe());

    this._unsubscribers = [];
  }

  dispose() {
    this._unsubscribers.forEach(unsubscribe => unsubscribe());

    this._unsubscribers = [];
  }

}
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