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 NumberRepeatStrategy {
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7 | |
8 |
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9 |
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10 | getCollectionObserver() {
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11 | return null;
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12 | }
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13 |
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14 | |
15 |
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16 |
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17 |
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18 | instanceChanged(repeat, value) {
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19 | let removePromise = repeat.removeAllViews(true, !repeat.viewsRequireLifecycle);
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20 | if (removePromise instanceof Promise) {
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21 | removePromise.then(() => this._standardProcessItems(repeat, value));
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22 | return;
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23 | }
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24 | this._standardProcessItems(repeat, value);
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25 | }
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26 |
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27 | |
28 |
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29 |
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30 | _standardProcessItems(repeat, value) {
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31 | let childrenLength = repeat.viewCount();
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32 | let i;
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33 | let ii;
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34 | let overrideContext;
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35 | let viewsToRemove;
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36 |
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37 | value = Math.floor(value);
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38 | viewsToRemove = childrenLength - value;
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39 |
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40 | if (viewsToRemove > 0) {
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41 | if (viewsToRemove > childrenLength) {
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42 | viewsToRemove = childrenLength;
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43 | }
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44 |
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45 | for (i = 0, ii = viewsToRemove; i < ii; ++i) {
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46 | repeat.removeView(childrenLength - (i + 1), true, !repeat.viewsRequireLifecycle);
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47 | }
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48 |
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49 | return;
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50 | }
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51 |
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52 | for (i = childrenLength, ii = value; i < ii; ++i) {
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53 | overrideContext = createFullOverrideContext(repeat, i, i, ii);
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54 | repeat.addView(overrideContext.bindingContext, overrideContext);
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55 | }
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56 |
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57 | updateOverrideContexts(repeat.views(), 0);
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58 | }
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59 | }
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