1 | "use strict";
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2 | Object.defineProperty(exports, "__esModule", { value: true });
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3 | var xstream_1 = require("xstream");
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4 | function fromEvent(element, eventName, useCapture, preventDefault, passive) {
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5 | if (useCapture === void 0) { useCapture = false; }
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6 | if (preventDefault === void 0) { preventDefault = false; }
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7 | if (passive === void 0) { passive = false; }
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8 | var next = null;
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9 | return xstream_1.Stream.create({
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10 | start: function start(listener) {
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11 | if (preventDefault) {
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12 | next = function _next(event) {
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13 | preventDefaultConditional(event, preventDefault);
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14 | listener.next(event);
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15 | };
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16 | }
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17 | else {
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18 | next = function _next(event) {
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19 | listener.next(event);
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20 | };
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21 | }
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22 | element.addEventListener(eventName, next, {
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23 | capture: useCapture,
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24 | passive: passive,
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25 | });
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26 | },
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27 | stop: function stop() {
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28 | element.removeEventListener(eventName, next, useCapture);
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29 | next = null;
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30 | },
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31 | });
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32 | }
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33 | exports.fromEvent = fromEvent;
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34 | function matchObject(matcher, obj) {
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35 | var keys = Object.keys(matcher);
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36 | var n = keys.length;
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37 | for (var i = 0; i < n; i++) {
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38 | var k = keys[i];
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39 | if (typeof matcher[k] === 'object' && typeof obj[k] === 'object') {
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40 | if (!matchObject(matcher[k], obj[k])) {
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41 | return false;
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42 | }
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43 | }
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44 | else if (matcher[k] !== obj[k]) {
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45 | return false;
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46 | }
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47 | }
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48 | return true;
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49 | }
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50 | function preventDefaultConditional(event, preventDefault) {
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51 | if (preventDefault) {
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52 | if (typeof preventDefault === 'boolean') {
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53 | event.preventDefault();
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54 | }
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55 | else if (isPredicate(preventDefault)) {
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56 | if (preventDefault(event)) {
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57 | event.preventDefault();
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58 | }
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59 | }
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60 | else if (typeof preventDefault === 'object') {
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61 | if (matchObject(preventDefault, event)) {
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62 | event.preventDefault();
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63 | }
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64 | }
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65 | else {
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66 | throw new Error('preventDefault has to be either a boolean, predicate function or object');
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67 | }
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68 | }
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69 | }
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70 | exports.preventDefaultConditional = preventDefaultConditional;
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71 | function isPredicate(fn) {
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72 | return typeof fn === 'function';
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73 | }
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74 |
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