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import {
findClosestBlockEntityContainer,
findClosestEntityWrapper,
isNodeOfType,
} from 'roosterjs-content-model-dom';
import type { DOMHelper, TextMutationObserver } from 'roosterjs-content-model-types';
import type { Mutation } from './MutationType';
class TextMutationObserverImpl implements TextMutationObserver {
private observer: MutationObserver;
private domHelper: DOMHelper;
constructor(
private contentDiv: HTMLDivElement,
private onMutation: (mutation: Mutation) => void
) {
this.observer = new MutationObserver(this.onMutationInternal);
this.domHelper = createDOMHelper(contentDiv);
}
startObserving() {
this.observer.observe(this.contentDiv, {
subtree: true,
childList: true,
attributes: true,
characterData: true,
});
}
stopObserving() {
this.observer.disconnect();
}
flushMutations(ignoreMutations?: boolean) {
const mutations = this.observer.takeRecords();
if (!ignoreMutations) {
this.onMutationInternal(mutations);
}
}
private onMutationInternal = (mutations: MutationRecord[]) => {
let canHandle = true;
let firstTarget: Node | null = null;
let lastTextChangeNode: Node | null = null;
let addedNodes: Node[] = [];
let removedNodes: Node[] = [];
let reconcileText = false;
const ignoredNodes = new Set<Node>();
const includedNodes = new Set<Node>();
for (let i = 0; i < mutations.length && canHandle; i++) {
const mutation = mutations[i];
const target = mutation.target;
if (ignoredNodes.has(target)) {
continue;
} else if (!includedNodes.has(target)) {
if (
findClosestEntityWrapper(target, this.domHelper) ||
findClosestBlockEntityContainer(target, this.domHelper)
) {
ignoredNodes.add(target);
continue;
} else {
includedNodes.add(target);
}
}
switch (mutation.type) {
case 'attributes':
if (this.domHelper.isNodeInEditor(target, true /*excludingSelf*/)) {
if (
mutation.attributeName == 'id' &&
isNodeOfType(target, 'ELEMENT_NODE')
) {
this.onMutation({ type: 'elementId', element: target });
} else {
// We cannot handle attributes changes on editor content for now
canHandle = false;
}
}
break;
case 'characterData':
Iif (lastTextChangeNode && lastTextChangeNode != mutation.target) {
// Multiple text nodes got changed, we don't know how to handle it
canHandle = false;
} else {
lastTextChangeNode = mutation.target;
reconcileText = true;
}
break;
case 'childList':
if (!firstTarget) {
firstTarget = mutation.target;
} else if (firstTarget != mutation.target) {
canHandle = false;
}
if (canHandle) {
addedNodes = addedNodes.concat(Array.from(mutation.addedNodes));
removedNodes = removedNodes.concat(Array.from(mutation.removedNodes));
}
break;
}
}
if (canHandle) {
if (addedNodes.length > 0 || removedNodes.length > 0) {
this.onMutation({
type: 'childList',
addedNodes,
removedNodes,
});
}
if (reconcileText) {
this.onMutation({ type: 'text' });
}
} else {
this.onMutation({ type: 'unknown' });
}
};
}
/**
* @internal
*/
export function createTextMutationObserver(
contentDiv: HTMLDivElement,
onMutation: (mutation: Mutation) => void
): TextMutationObserver {
return new TextMutationObserverImpl(contentDiv, onMutation);
}
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