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feat: fractional indexing (#7359)

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* Introducing fractional indices as part of `element.index`

* Ensuring invalid fractional indices are always synchronized with the array order

* Simplifying reconciliation based on the fractional indices

* Moving reconciliation inside the `@excalidraw/excalidraw` package

---------

Co-authored-by: Marcel Mraz <marcel@excalidraw.com>
Co-authored-by: dwelle <5153846+dwelle@users.noreply.github.com>
This commit is contained in:
Ryan Di 2024-04-04 20:51:11 +08:00 • committed by GitHub
parent bbdcd30a73
commit 32df5502ae
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50 changed files with 3640 additions and 2047 deletions
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37
excalidraw-app/collab/Portal.tsx
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@ -2,11 +2,12 @@ import {
isSyncableElement,
SocketUpdateData,
SocketUpdateDataSource,
SyncableExcalidrawElement,
} from "../data";
import { TCollabClass } from "./Collab";
import { ExcalidrawElement } from "../../packages/excalidraw/element/types";
import { OrderedExcalidrawElement } from "../../packages/excalidraw/element/types";
import { WS_EVENTS, FILE_UPLOAD_TIMEOUT, WS_SUBTYPES } from "../app_constants";
import {
OnUserFollowedPayload,
@ -16,9 +17,7 @@ import {
import { trackEvent } from "../../packages/excalidraw/analytics";
import throttle from "lodash.throttle";
import { newElementWith } from "../../packages/excalidraw/element/mutateElement";
import { BroadcastedExcalidrawElement } from "./reconciliation";
import { encryptData } from "../../packages/excalidraw/data/encryption";
import { PRECEDING_ELEMENT_KEY } from "../../packages/excalidraw/constants";
import type { Socket } from "socket.io-client";
class Portal {
@ -133,7 +132,7 @@ class Portal {
broadcastScene = async (
updateType: WS_SUBTYPES.INIT | WS_SUBTYPES.UPDATE,
allElements: readonly ExcalidrawElement[],
elements: readonly OrderedExcalidrawElement[],
syncAll: boolean,
) => {
if (updateType === WS_SUBTYPES.INIT && !syncAll) {
@ -143,25 +142,17 @@ class Portal {
// sync out only the elements we think we need to to save bandwidth.
// periodically we'll resync the whole thing to make sure no one diverges
// due to a dropped message (server goes down etc).
const syncableElements = allElements.reduce(
(acc, element: BroadcastedExcalidrawElement, idx, elements) => {
if (
(syncAll ||
!this.broadcastedElementVersions.has(element.id) ||
element.version >
this.broadcastedElementVersions.get(element.id)!) &&
isSyncableElement(element)
) {
acc.push({
...element,
// z-index info for the reconciler
[PRECEDING_ELEMENT_KEY]: idx === 0 ? "^" : elements[idx - 1]?.id,
});
}
return acc;
},
[] as BroadcastedExcalidrawElement[],
);
const syncableElements = elements.reduce((acc, element) => {
if (
(syncAll ||
!this.broadcastedElementVersions.has(element.id) ||
element.version > this.broadcastedElementVersions.get(element.id)!) &&
isSyncableElement(element)
) {
acc.push(element);
}
return acc;
}, [] as SyncableExcalidrawElement[]);
const data: SocketUpdateDataSource[typeof updateType] = {
type: updateType,