94 lines
2.2 KiB
TypeScript
94 lines
2.2 KiB
TypeScript
/*
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* Copyright notice:
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*
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* Large parts of this file are heavily inspired if not downright copied from editor.js,
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* copyright MIT.
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* https://editorjs.io/
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*/
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import { isElement } from './dom';
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export const getSelection = globalThis.getSelection ? globalThis.getSelection : () => null;
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/**
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* Returns range from passed Selection object
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*
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* @param selection - Selection object to get Range from
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*/
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export const getRangeFromSelection = (selection: Selection): Range|null => {
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return selection && selection.rangeCount ? selection.getRangeAt(0) : null;
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}
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/**
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* Returns selected anchor element
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*
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* @returns {Element|null}
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*/
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export const getAnchorElementForSelection = (selection: Selection): Element | null => {
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const anchorNode = selection.anchorNode;
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if (!anchorNode) {
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return null;
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}
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if (!isElement(anchorNode)) {
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return anchorNode.parentElement;
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} else {
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return anchorNode;
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}
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}
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/**
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* Calculates position and size of selected text
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*
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* @returns {DOMRect}
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*/
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export const getRect = (selection: Selection): DOMRect => {
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const defaultRect = {
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x: 0,
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y: 0,
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width: 0,
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height: 0,
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} as DOMRect;
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if (selection.rangeCount === null || isNaN(selection.rangeCount)) {
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console.warn('Method SelectionUtils.rangeCount is not supported');
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return defaultRect;
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}
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if (selection.rangeCount === 0) {
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return defaultRect;
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}
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const range = selection.getRangeAt(0).cloneRange() as Range;
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let rect = { ...defaultRect };
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if (range.getBoundingClientRect) {
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rect = range.getBoundingClientRect() as DOMRect;
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}
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// Fall back to inserting a temporary element
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if (rect.x === 0 && rect.y === 0) {
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const span = document.createElement('span');
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if (span.getBoundingClientRect) {
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// Ensure span has dimensions and position by
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// adding a zero-width space character
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span.appendChild(document.createTextNode('\u200b'));
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range.insertNode(span);
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rect = span.getBoundingClientRect() as DOMRect;
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const spanParent = span.parentNode;
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if (spanParent) {
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spanParent.removeChild(span);
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// Glue any broken text nodes back together
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spanParent.normalize();
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}
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}
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}
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return rect;
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};
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