| 1 | import { mixin } from "../mixin.js";
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| 2 | const IWatchMixin = mixin({
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| 3 | addWatch(id, fn) {
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| 4 | this._watches = this._watches || {};
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| 5 | if (this._watches[id]) {
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| 6 | return false;
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| 7 | }
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| 8 | this._watches[id] = fn;
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| 9 | return true;
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| 10 | },
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| 11 | removeWatch(id) {
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| 12 | if (!this._watches) return;
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| 13 | if (this._watches[id]) {
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| 14 | delete this._watches[id];
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| 15 | return true;
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| 16 | }
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| 17 | return false;
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| 18 | },
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| 19 | notifyWatches(oldState, newState) {
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| 20 | if (!this._watches) return;
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| 21 | const w = this._watches;
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| 22 | for (let id in w) {
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| 23 | w[id](id, oldState, newState);
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| 24 | }
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| 25 | }
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| 26 | });
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| 27 | export {
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| 28 | IWatchMixin
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| 29 | };
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