1 | import { Stream } from 'xstream';
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2 | export function fromEvent(element, eventName, useCapture, preventDefault, passive) {
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3 | if (useCapture === void 0) { useCapture = false; }
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4 | if (preventDefault === void 0) { preventDefault = false; }
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5 | if (passive === void 0) { passive = false; }
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6 | var next = null;
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7 | return Stream.create({
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8 | start: function start(listener) {
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9 | if (preventDefault) {
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10 | next = function _next(event) {
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11 | preventDefaultConditional(event, preventDefault);
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12 | listener.next(event);
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13 | };
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14 | }
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15 | else {
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16 | next = function _next(event) {
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17 | listener.next(event);
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18 | };
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19 | }
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20 | element.addEventListener(eventName, next, {
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21 | capture: useCapture,
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22 | passive: passive,
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23 | });
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24 | },
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25 | stop: function stop() {
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26 | element.removeEventListener(eventName, next, useCapture);
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27 | next = null;
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28 | },
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29 | });
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30 | }
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31 | function matchObject(matcher, obj) {
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32 | var keys = Object.keys(matcher);
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33 | var n = keys.length;
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34 | for (var i = 0; i < n; i++) {
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35 | var k = keys[i];
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36 | if (typeof matcher[k] === 'object' && typeof obj[k] === 'object') {
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37 | if (!matchObject(matcher[k], obj[k])) {
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38 | return false;
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39 | }
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40 | }
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41 | else if (matcher[k] !== obj[k]) {
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42 | return false;
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43 | }
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44 | }
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45 | return true;
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46 | }
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47 | export function preventDefaultConditional(event, preventDefault) {
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48 | if (preventDefault) {
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49 | if (typeof preventDefault === 'boolean') {
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50 | event.preventDefault();
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51 | }
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52 | else if (isPredicate(preventDefault)) {
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53 | if (preventDefault(event)) {
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54 | event.preventDefault();
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55 | }
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56 | }
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57 | else if (typeof preventDefault === 'object') {
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58 | if (matchObject(preventDefault, event)) {
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59 | event.preventDefault();
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60 | }
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61 | }
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62 | else {
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63 | throw new Error('preventDefault has to be either a boolean, predicate function or object');
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64 | }
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65 | }
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66 | }
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67 | function isPredicate(fn) {
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68 | return typeof fn === 'function';
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69 | }
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70 |
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