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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) {
this.rng = range;
}
text() {
return this.rng.toString();
}
setLength(length) {
const end = this.findEnd(this.rng.startContainer, this.rng.startOffset, length);
this.rng.setEnd(end.node, end.offset);
}
findEnd(node, offset, length) {
if (node.nodeType === 3) {
const remainder = node.data.length - offset;
if (remainder >= length) {
return {node, offset: offset + length};
}
length -= remainder;
}
if (node.childNodes.length > 0) {
return this.findEnd(node.childNodes[0], 0, length);
}
if (node.nextSibling !== null) {
return this.findEnd(node.nextSibling, 0, length);
}
return {node, offset: node.data.length};
}
containsPoint(point) {
const rect = this.getPaddedRect();
return point.x >= rect.left && point.x <= rect.right;
}
getRect() {
return this.rng.getBoundingClientRect();
}
getPaddedRect() {
const range = this.rng.cloneRange();
const startOffset = range.startOffset;
const endOffset = range.endOffset;
const node = range.startContainer;
range.setStart(node, Math.max(0, startOffset - 1));
range.setEnd(node, Math.min(node.length, endOffset + 1));
return range.getBoundingClientRect();
}
select() {
const selection = window.getSelection();
selection.removeAllRanges();
selection.addRange(this.rng);
}
deselect() {
const selection = window.getSelection();
selection.removeAllRanges();
}
compareOrigin(range) {
return range.rng.compareBoundaryPoints(Range.END_TO_END, this.rng);
}
static fromPoint(point) {
const range = document.caretRangeFromPoint(point.x, point.y);
return range === null ? null : new Range(range);
}
}
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