1 | import { mixin } from "../mixin.js";
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2 | export 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)
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13 | return;
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14 | if (this._watches[id]) {
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15 | delete this._watches[id];
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16 | return true;
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17 | }
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18 | return false;
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19 | },
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20 | notifyWatches(oldState, newState) {
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21 | if (!this._watches)
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22 | return;
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23 | const w = this._watches;
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24 | for (let id in w) {
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25 | w[id](id, oldState, newState);
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26 | }
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27 | },
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28 | });
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