50 lines
1.2 KiB
Plaintext
50 lines
1.2 KiB
Plaintext
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule isSelectionAtLeafStart
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* @format
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* @flow
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*/
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'use strict';
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import type EditorState from './EditorState';
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function isSelectionAtLeafStart(editorState: EditorState): boolean {
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var selection = editorState.getSelection();
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var anchorKey = selection.getAnchorKey();
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var blockTree = editorState.getBlockTree(anchorKey);
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var offset = selection.getStartOffset();
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var isAtStart = false;
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blockTree.some(leafSet => {
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if (offset === leafSet.get('start')) {
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isAtStart = true;
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return true;
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}
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if (offset < leafSet.get('end')) {
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return leafSet.get('leaves').some(leaf => {
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var leafStart = leaf.get('start');
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if (offset === leafStart) {
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isAtStart = true;
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return true;
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}
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return false;
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});
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}
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return false;
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});
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return isAtStart;
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}
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module.exports = isSelectionAtLeafStart; |