yomichan/content.js

56 lines
1.5 KiB
JavaScript

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