| 1 | import { dispatch } from "d3-dispatch";
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| 2 | import debounce from "../utils/debounce";
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| 3 |
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| 4 | export default () => {
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| 5 | let triggered = 0;
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| 6 |
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| 7 | const events = dispatch("change");
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| 8 |
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| 9 | function change() {
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| 10 | events.apply("change", this, arguments);
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| 11 | triggered += 1;
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| 12 | }
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| 13 |
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| 14 | return {
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| 15 | change,
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| 16 | on(typename, callback) {
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| 17 | if (arguments.length < 2) return events.on(typename);
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| 18 | events.on(typename, callback);
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| 19 | return this;
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| 20 | },
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| 21 | trigger: debounce(change),
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| 22 | triggered() {
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| 23 | return triggered;
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| 24 | }
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| 25 | };
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| 26 | };
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