vscroll/dist/esm5/classes/reactive.js

Virtual scroll engine

import { __read, __values } from "tslib";
var Reactive = /** @class */ (function () {
  function Reactive(value, options) {
    this.id = 0;
    if (value !== void 0) {
      this.value = value;
      this.initialValue = value;
    }
    this.options = options || {};
    this.subscriptions = new Map();
  }
  Reactive.prototype.set = function (value) {
    var e_1, _a;
    if (this.value === value && !this.options.emitEqual) {
      return;
    }
    this.value = value;
    try {
      for (var _b = __values(this.subscriptions), _c = _b.next(); !_c.done; _c = _b.next()) {
        var _d = __read(_c.value, 2), sub = _d[1];
        sub.emit(value);
        if (this.value !== value) {
          break;
        }
      }
    }
    catch (e_1_1) { e_1 = { error: e_1_1 }; }
    finally {
      try {
        if (_c && !_c.done && (_a = _b.return)) _a.call(_b);
      }
      finally { if (e_1) throw e_1.error; }
    }
  };
  Reactive.prototype.get = function () {
    return this.value;
  };
  Reactive.prototype.on = function (func) {
    var _this = this;
    var id = this.id++;
    var subscription = {
      emit: func,
      off: function () {
        subscription.emit = function () { return null; };
        _this.subscriptions.delete(id);
      }
    };
    this.subscriptions.set(id, subscription);
    if (this.options.emitOnSubscribe) {
      subscription.emit(this.value);
    }
    return function () { return subscription.off(); };
  };
  Reactive.prototype.once = function (func) {
    var off = this.on(function (v) {
      off();
      func(v);
    });
    return off;
  };
  Reactive.prototype.reset = function () {
    this.set(this.initialValue);
  };
  Reactive.prototype.dispose = function () {
    this.subscriptions.forEach(function (sub) { return sub.off(); });
  };
  return Reactive;
}());
export { Reactive };
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