yomichan/ext/fg/js/range.js

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/*
* 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/>.
*/
class Range {
constructor(range) {
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this.rng = range;
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}
text() {
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return this.rng.toString();
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}
setLength(length) {
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const node = this.rng.startContainer;
const offset = this.rng.startOffset;
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length = Math.min(node.length - offset, length);
if (length === 0) {
return null;
}
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this.rng.setEnd(node, offset + length);
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return length;
}
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containsPoint(point) {
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const rect = this.getPaddedRect();
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return point.x >= rect.left && point.x <= rect.right;
}
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getRect() {
return this.rng.getBoundingClientRect();
}
getPaddedRect() {
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const range = this.rng.cloneRange();
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const startOffset = range.startOffset;
const endOffset = range.endOffset;
const node = range.startContainer;
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range.setStart(node, Math.max(0, startOffset - 1));
range.setEnd(node, Math.min(node.length, endOffset + 1));
return range.getBoundingClientRect();
}
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select() {
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const selection = window.getSelection();
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selection.removeAllRanges();
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selection.addRange(this.rng);
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}
deselect() {
const selection = window.getSelection();
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selection.removeAllRanges();
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}
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compareOrigin(range) {
return range.rng.compareBoundaryPoints(Range.END_TO_END, this.rng);
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}
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static fromPoint(point) {
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const range = document.caretRangeFromPoint(point.x, point.y);
return range === null ? null : new Range(range);
}
}