108 lines
2.9 KiB
TypeScript
108 lines
2.9 KiB
TypeScript
// Copyright 2023 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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const QUILL_EMBED_GUARD = '\uFEFF';
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export function createEventHandler({
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deleteSelection,
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}: {
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deleteSelection: boolean;
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}) {
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return (event: ClipboardEvent): void => {
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// If we're attempting to cut, and focus is not in one of our composer elements, we
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// let the browser do its default behavior. We don't need formatting from them.
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if (deleteSelection) {
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const { activeElement } = document;
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if (
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!activeElement ||
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activeElement.matches('input, textarea') ||
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!activeElement.closest('[contenteditable=true]')
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) {
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return;
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}
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}
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if (!event.clipboardData) {
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return;
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}
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const selection = window.getSelection();
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if (!selection) {
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return;
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}
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// Create synthetic html with the full selection we can put into clipboard
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const container = document.createElement('div');
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for (let i = 0, max = selection.rangeCount; i < max; i += 1) {
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const range = selection.getRangeAt(i);
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container.appendChild(range.cloneContents());
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}
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// We fail over to selection.toString() because we can't pull values from the DOM if
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// the selection is within an <input/> or <textarea/>. But the browser can!
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const plaintext = getStringFromNode(container) || selection.toString();
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// Note: we can't leave text/plain alone and just add text/signal; if we update
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// clipboardData at all, all other data is reset.
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event.clipboardData?.setData('text/plain', plaintext);
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event.clipboardData?.setData('text/signal', container.innerHTML);
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if (deleteSelection) {
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selection.deleteFromDocument();
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}
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event.preventDefault();
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event.stopPropagation();
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};
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}
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function getStringFromNode(
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node: Node,
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parent?: Node,
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nextSibling?: Node
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): string {
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if (node.nodeType === Node.TEXT_NODE) {
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if (node.textContent === QUILL_EMBED_GUARD) {
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return '';
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}
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return node.textContent || '';
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}
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if (node.nodeType !== Node.ELEMENT_NODE) {
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return '';
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}
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const element = node as Element;
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if (
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element.nodeName === 'IMG' &&
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(element.classList.contains('emoji') ||
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element.classList.contains('emoji-blot'))
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) {
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return element.ariaLabel || '';
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}
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if (nextSibling && element.nodeName === 'BR') {
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return '\n';
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}
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const childCount = element.childNodes.length;
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if (childCount === 0) {
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return element.textContent || '';
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}
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let result = '';
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for (let i = 0; i < childCount; i += 1) {
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const child = element.childNodes[i];
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const nextChild = element.childNodes[i + 1];
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result += getStringFromNode(child, node, nextChild);
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}
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if (
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parent &&
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parent.childNodes.length > 1 &&
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(element.nodeName === 'P' ||
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element.nodeName === 'DIV' ||
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element.nodeName === 'TIME')
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) {
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if (result.length > 0 && !result.endsWith('\n\n')) {
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result += '\n';
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}
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}
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return result;
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}
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