1 | import {createFullOverrideContext, updateOverrideContexts} from './repeat-utilities';
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2 |
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3 |
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4 |
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5 |
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6 | export class MapRepeatStrategy {
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7 | |
8 |
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9 |
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10 |
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11 | getCollectionObserver(observerLocator, items) {
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12 | return observerLocator.getMapObserver(items);
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13 | }
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14 |
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15 | |
16 |
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17 |
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18 |
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19 | instanceChanged(repeat, items) {
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20 | let removePromise = repeat.removeAllViews(true, !repeat.viewsRequireLifecycle);
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21 | if (removePromise instanceof Promise) {
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22 | removePromise.then(() => this._standardProcessItems(repeat, items));
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23 | return;
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24 | }
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25 | this._standardProcessItems(repeat, items);
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26 | }
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27 |
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28 | |
29 |
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30 |
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31 | _standardProcessItems(repeat, items) {
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32 | let index = 0;
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33 | let overrideContext;
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34 |
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35 | items.forEach((value, key) => {
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36 | overrideContext = createFullOverrideContext(repeat, value, index, items.size, key);
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37 | repeat.addView(overrideContext.bindingContext, overrideContext);
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38 | ++index;
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39 | });
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40 | }
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41 |
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42 | |
43 |
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44 |
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45 |
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46 |
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47 | instanceMutated(repeat, map, records) {
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48 | let key;
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49 | let i;
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50 | let ii;
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51 | let overrideContext;
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52 | let removeIndex;
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53 | let addIndex;
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54 | let record;
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55 | let rmPromises = [];
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56 | let viewOrPromise;
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57 |
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58 | for (i = 0, ii = records.length; i < ii; ++i) {
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59 | record = records[i];
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60 | key = record.key;
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61 | switch (record.type) {
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62 | case 'update':
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63 | removeIndex = this._getViewIndexByKey(repeat, key);
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64 | viewOrPromise = repeat.removeView(removeIndex, true, !repeat.viewsRequireLifecycle);
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65 | if (viewOrPromise instanceof Promise) {
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66 | rmPromises.push(viewOrPromise);
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67 | }
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68 | overrideContext = createFullOverrideContext(repeat, map.get(key), removeIndex, map.size, key);
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69 | repeat.insertView(removeIndex, overrideContext.bindingContext, overrideContext);
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70 | break;
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71 | case 'add':
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72 | addIndex = repeat.viewCount() <= map.size - 1 ? repeat.viewCount() : map.size - 1;
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73 | overrideContext = createFullOverrideContext(repeat, map.get(key), addIndex, map.size, key);
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74 | repeat.insertView(map.size - 1, overrideContext.bindingContext, overrideContext);
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75 | break;
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76 | case 'delete':
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77 | if (record.oldValue === undefined) { return; }
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78 | removeIndex = this._getViewIndexByKey(repeat, key);
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79 | viewOrPromise = repeat.removeView(removeIndex, true, !repeat.viewsRequireLifecycle);
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80 | if (viewOrPromise instanceof Promise) {
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81 | rmPromises.push(viewOrPromise);
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82 | }
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83 | break;
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84 | case 'clear':
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85 | repeat.removeAllViews(true, !repeat.viewsRequireLifecycle);
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86 | break;
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87 | default:
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88 | continue;
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89 | }
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90 | }
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91 |
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92 | if (rmPromises.length > 0) {
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93 | Promise.all(rmPromises).then(() => {
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94 | updateOverrideContexts(repeat.views(), 0);
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95 | });
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96 | } else {
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97 | updateOverrideContexts(repeat.views(), 0);
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98 | }
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99 | }
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100 |
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101 | |
102 |
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103 |
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104 | _getViewIndexByKey(repeat, key) {
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105 | let i: number;
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106 | let ii: number;
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107 | let child;
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108 |
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109 | for (i = 0, ii = repeat.viewCount(); i < ii; ++i) {
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110 | child = repeat.view(i);
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111 | if (child.bindingContext[repeat.key] === key) {
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112 | return i;
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113 | }
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114 | }
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115 |
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116 | return undefined;
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117 | }
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118 | }
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