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11 | 'use strict';
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12 |
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13 | function isSelectionAtLeafStart(editorState) {
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14 | var selection = editorState.getSelection();
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15 | var anchorKey = selection.getAnchorKey();
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16 | var blockTree = editorState.getBlockTree(anchorKey);
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17 | var offset = selection.getStartOffset();
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18 | var isAtStart = false;
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19 | blockTree.some(function (leafSet) {
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20 | if (offset === leafSet.get('start')) {
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21 | isAtStart = true;
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22 | return true;
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23 | }
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24 |
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25 | if (offset < leafSet.get('end')) {
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26 | return leafSet.get('leaves').some(function (leaf) {
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27 | var leafStart = leaf.get('start');
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28 |
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29 | if (offset === leafStart) {
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30 | isAtStart = true;
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31 | return true;
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32 | }
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33 |
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34 | return false;
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35 | });
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36 | }
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37 |
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38 | return false;
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39 | });
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40 | return isAtStart;
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41 | }
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43 | module.exports = isSelectionAtLeafStart; |
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