55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
/*
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* Copyright (C) 2016 Alex Yatskov <alex@foosoft.net>
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* Author: Alex Yatskov <alex@foosoft.net>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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function getRangeAtCursor(e, lookAhead) {
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const range = document.caretRangeFromPoint(e.clientX, e.clientY);
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if (range === null) {
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return null
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}
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const node = range.startContainer;
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if (node.nodeType !== 3 /* TEXT_NODE */) {
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return null;
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}
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const offset = range.startOffset;
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const length = Math.min(node.length - offset, lookAhead);
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range.setEnd(node, offset + length);
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return range;
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}
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function onMouseDown(e) {
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const range = getRangeAtCursor(e, 20);
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if (range === null) {
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return;
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}
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const selection = window.getSelection();
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selection.removeAllRanges();
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selection.addRange(range);
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e.preventDefault();
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console.log(range.toString());
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}
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window.addEventListener('mousedown', onMouseDown, false);
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