71 lines
2.1 KiB
JavaScript
71 lines
2.1 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 getRangeAtPoint(point, lookAhead) {
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const range = document.caretRangeFromPoint(point.x, point.y);
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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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if (length === 0) {
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return null;
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}
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range.setEnd(node, offset + length);
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return range;
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}
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function getRangePaddedRect(range) {
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const node = range.startContainer;
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const startOffset = range.startOffset;
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const endOffset = range.endOffset;
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range.setStart(node, Math.max(0, startOffset - 1));
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range.setEnd(node, Math.min(node.length, endOffset + 1));
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const rect = range.getBoundingClientRect();
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range.setStart(node, startOffset);
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range.setEnd(node, endOffset);
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return rect;
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}
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function getPopupPositionForRange(popup, range, offset) {
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const rangeRect = range.getBoundingClientRect();
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const popupRect = popup.getBoundingClientRect();
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let posX = rangeRect.left;
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if (posX + popupRect.width >= window.innerWidth) {
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posX = window.innerWidth - popupRect.width;
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}
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let posY = rangeRect.bottom + offset;
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if (posY + popupRect.height >= window.innerHeight) {
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posY = rangeRect.top - popupRect.height - offset;
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}
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return {x: posX, y: posY};
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}
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