(1/2) Cursor Chat - Presence (#1487)

This PR adds support for seeing **another user**'s chat messages.

It's part 1 of two PRs relating to Cursor Chat.
And it's needed for the much bigger part 2:
https://github.com/tldraw/brivate/pull/1981

# Presence

You can see another person's chat messages!

![2023-06-02 at 17 42 33 - Blush
Capybara](https://github.com/tldraw/tldraw/assets/15892272/8f3efb5f-9c05-459c-aa7e-24842be75e58)

If they have a name, it gets popped on top.

![2023-06-02 at 17 45 34 - Sapphire
Meerkat](https://github.com/tldraw/tldraw/assets/15892272/749bd924-c1f5-419b-a028-1fafe1b61292)

That's it!
With this PR, there's no way of actually *typing* your chat messages.
That comes with the [next
one](https://github.com/tldraw/brivate/pull/1981)!

# Admin

### To-do

- [x] Store chat message
- [x] Allow overflowing chat
- [x] Presence for chat message
- [x] Display chat message to others

### Change Type

- [x] `minor` — New Feature

### Test Plan

To test this, I recommend checking out both `lu/cursor-chat` branches,
and opening two browser sessions in the same shared project.

1. In one session, type some cursor chat by pressing the Enter key while
on the canvas (and typing).
2. On the other session, check that you can see the chat message appear.
3. Repeat this while being both named, and unnamed.

I recommend just focusing on the visible presense in this PR.
The [other PR](https://github.com/tldraw/brivate/pull/1981) is where we
can focus about how we _input_ the cursor chat.

### Release Notes

- [dev] Added support for cursor chat presence.

---------

Co-authored-by: Steve Ruiz <steveruizok@gmail.com>

apps/examples/src/11-user-presence/UserPresenceExample.tsx

@@ -1,15 +1,16 @@
+/* eslint-disable no-inner-declarations */
 import { InstancePresenceRecordType, Tldraw } from '@tldraw/tldraw'
 import '@tldraw/tldraw/editor.css'
 import '@tldraw/tldraw/ui.css'
 import { useRef } from 'react'
 
-const SHOW_MOVING_CURSOR = true
+const USER_NAME = 'huppy da arrow'
-const CURSOR_SPEED = 0.5
+const MOVING_CURSOR_SPEED = 0.25 // 0 is stopped, 1 is full send
-const CIRCLE_RADIUS = 100
+const MOVING_CURSOR_RADIUS = 100
-const UPDATE_FPS = 60
+const CURSOR_CHAT_MESSAGE = 'Hey, I think this is just great.'
 
 export default function UserPresenceExample() {
-	const rTimeout = useRef<any>(-1)
+	const rRaf = useRef<any>(-1)
 	return (
 		<div className="tldraw__editor">
 			<Tldraw
@@ -22,39 +23,62 @@ export default function UserPresenceExample() {
 						id: InstancePresenceRecordType.createId(editor.store.id),
 						currentPageId: editor.currentPageId,
 						userId: 'peer-1',
-						userName: 'Peer 1',
+						userName: USER_NAME,
 						cursor: { x: 0, y: 0, type: 'default', rotation: 0 },
+						chatMessage: CURSOR_CHAT_MESSAGE,
 					})
 
 					editor.store.put([peerPresence])
 
 					// Make the fake user's cursor rotate in a circle
-					if (rTimeout.current) {
+					const raf = rRaf.current
-						clearTimeout(rTimeout.current)
+					cancelAnimationFrame(raf)
-					}
+
+					if (MOVING_CURSOR_SPEED > 0 || CURSOR_CHAT_MESSAGE) {
+						function loop() {
+							let cursor = peerPresence.cursor
+							let chatMessage = peerPresence.chatMessage
 
-					if (SHOW_MOVING_CURSOR) {
-						rTimeout.current = setInterval(() => {
-							const k = 1000 / CURSOR_SPEED
 							const now = Date.now()
-							const t = (now % k) / k
+
-							// rotate in a circle
+							if (MOVING_CURSOR_SPEED > 0) {
+								const k = 1000 / MOVING_CURSOR_SPEED
+								const t = (now % k) / k
+
+								cursor = {
+									...peerPresence.cursor,
+									x: 150 + Math.cos(t * Math.PI * 2) * MOVING_CURSOR_RADIUS,
+									y: 150 + Math.sin(t * Math.PI * 2) * MOVING_CURSOR_RADIUS,
+								}
+							}
+
+							if (CURSOR_CHAT_MESSAGE) {
+								const k = 1000
+								const t = (now % (k * 3)) / k
+								chatMessage =
+									t < 1
+										? ''
+										: t > 2
+										? CURSOR_CHAT_MESSAGE
+										: CURSOR_CHAT_MESSAGE.slice(0, Math.ceil((t - 1) * CURSOR_CHAT_MESSAGE.length))
+							}
+
 							editor.store.put([
 								{
 									...peerPresence,
-									cursor: {
+									cursor,
-										...peerPresence.cursor,
+									chatMessage,
-										x: 150 + Math.cos(t * Math.PI * 2) * CIRCLE_RADIUS,
-										y: 150 + Math.sin(t * Math.PI * 2) * CIRCLE_RADIUS,
-									},
 									lastActivityTimestamp: now,
 								},
 							])
-						}, 1000 / UPDATE_FPS)
+
+							rRaf.current = requestAnimationFrame(loop)
+						}
+
+						rRaf.current = requestAnimationFrame(loop)
 					} else {
 						editor.store.put([{ ...peerPresence, lastActivityTimestamp: Date.now() }])
-
+						rRaf.current = setInterval(() => {
-						rTimeout.current = setInterval(() => {
 							editor.store.put([{ ...peerPresence, lastActivityTimestamp: Date.now() }])
 						}, 1000)
 					}

assets/translations/main.json

@@ -46,6 +46,7 @@
 	"action.leave-shared-project": "Leave shared project",
 	"action.new-project": "New project",
 	"action.new-shared-project": "New shared project",
+	"action.open-cursor-chat": "Cursor chat",
 	"action.open-file": "Open file",
 	"action.pack": "Pack",
 	"action.paste": "Paste",
@@ -278,6 +279,7 @@
 	"shortcuts-dialog.tools": "Tools",
 	"shortcuts-dialog.transform": "Transform",
 	"shortcuts-dialog.view": "View",
+	"shortcuts-dialog.collaboration": "Collaboration",
 	"home-project-dialog.title": "Home project",
 	"home-project-dialog.description": "This is your local home project. It's just for you!",
 	"rename-project-dialog.title": "Rename project",
@@ -339,5 +341,6 @@
 	"vscode.file-open.backup": "Backup",
 	"vscode.file-open.backup-saved": "Backup saved",
 	"vscode.file-open.backup-failed": "Backup failed: this is not a .tldr file.",
-	"vscode.file-open.dont-show-again": "Don't ask again"
+	"vscode.file-open.dont-show-again": "Don't ask again",
+	"cursor-chat.type-to-chat": "Type to chat..."
 }

packages/editor/editor.css

@@ -62,6 +62,27 @@ https://alex.dytry.ch/toys/palette/?palette=%7B%22families%22:%5B%22black%22,%22
 	/* These cursor values get programmatically overridden */
 	/* They're just here to help your editor autocomplete */
 	--tl-cursor: var(--tl-default-svg);
+	--tl-cursor-none: none;
+	--tl-cursor-default: default;
+	--tl-cursor-pointer: pointer;
+	--tl-cursor-cross: crosshair;
+	--tl-cursor-move: move;
+	--tl-cursor-grab: grab;
+	--tl-cursor-grabbing: grabbing;
+	--tl-cursor-text: text;
+	--tl-cursor-resize-edge: ew-resize;
+	--tl-cursor-resize-corner: nesw-resize;
+	--tl-cursor-ew-resize: ew-resize;
+	--tl-cursor-ns-resize: ns-resize;
+	--tl-cursor-nesw-resize: nesw-resize;
+	--tl-cursor-nwse-resize: nwse-resize;
+	--tl-cursor-rotate: pointer;
+	--tl-cursor-nwse-rotate: pointer;
+	--tl-cursor-nesw-rotate: pointer;
+	--tl-cursor-senw-rotate: pointer;
+	--tl-cursor-swne-rotate: pointer;
+	--tl-cursor-zoom-in: zoom-in;
+	--tl-cursor-zoom-out: zoom-out;
 	--tl-scale: calc(1 / var(--tl-zoom));
 	--tl-font-draw: 'tldraw_draw', sans-serif;
 	--tl-font-sans: 'tldraw_sans', sans-serif;
@@ -746,7 +767,6 @@ input,
 	position: absolute;
 }
 
-/* Rounded corners */
 .tl-nametag {
 	position: absolute;
 	top: 16px;
@@ -754,15 +774,84 @@ input,
 	width: fit-content;
 	height: fit-content;
 	max-width: 120px;
-	color: var(--color-selected-contrast);
+	padding: 3px 6px;
 	white-space: nowrap;
 	position: absolute;
 	overflow: hidden;
 	text-overflow: ellipsis;
-	border-radius: 10px;
-	padding: 2px 6px;
 	font-size: 12px;
 	font-family: var(--font-family);
+	border-radius: var(--radius-2);
+	color: var(--color-selected-contrast);
+}
+
+.tl-nametag-title {
+	position: absolute;
+	top: -2px;
+	left: 13px;
+	width: fit-content;
+	height: fit-content;
+	padding: 0px 6px;
+	max-width: 120px;
+	white-space: nowrap;
+	position: absolute;
+	overflow: hidden;
+	text-overflow: ellipsis;
+	font-size: 12px;
+	font-family: var(--font-family);
+	text-shadow: var(--tl-text-outline);
+	color: var(--color-selected-contrast);
+}
+
+.tl-nametag-chat {
+	position: absolute;
+	top: 16px;
+	left: 13px;
+	width: fit-content;
+	height: fit-content;
+	color: var(--color-selected-contrast);
+	white-space: nowrap;
+	position: absolute;
+	padding: 3px 6px;
+	font-size: 12px;
+	font-family: var(--font-family);
+	opacity: 1;
+	border-radius: var(--radius-2);
+}
+
+.tl-cursor-chat {
+	position: absolute;
+	color: var(--color-selected-contrast);
+	white-space: nowrap;
+	padding: 3px 6px;
+	font-size: 12px;
+	font-family: var(--font-family);
+	pointer-events: none;
+	z-index: var(--layer-cursor);
+	margin-top: 16px;
+	margin-left: 13px;
+	opacity: 1;
+	border: none;
+	user-select: text;
+	border-radius: var(--radius-2);
+}
+
+.tl-cursor-chat::selection {
+	background: var(--color-selected);
+	color: var(--color-selected-contrast);
+	text-shadow: none;
+}
+
+.tl-cursor-chat-fade {
+	/* Setting to zero causes it to immediately disappear */
+	/* Setting to near-zero causes it to fade out gradually */
+	opacity: 0.0001;
+	transition: opacity 5s ease-in-out;
+}
+
+.tl-cursor-chat::placeholder {
+	color: var(--color-selected-contrast);
+	opacity: 0.7;
 }
 
 /* -------------------------------------------------- */

packages/editor/src/lib/components/DefaultCursor.tsx

@@ -10,23 +10,37 @@ export type TLCursorComponent = (props: {
 	zoom: number
 	color?: string
 	name: string | null
+	chatMessage: string
 }) => any | null
 
-const _Cursor: TLCursorComponent = ({ className, zoom, point, color, name }) => {
+const _Cursor: TLCursorComponent = ({ className, zoom, point, color, name, chatMessage }) => {
-	const rDiv = useRef<HTMLDivElement>(null)
+	const rCursor = useRef<HTMLDivElement>(null)
-	useTransform(rDiv, point?.x, point?.y, 1 / zoom)
+	useTransform(rCursor, point?.x, point?.y, 1 / zoom)
 
 	if (!point) return null
 
 	return (
-		<div ref={rDiv} className={classNames('tl-overlays__item', className)}>
+		<div ref={rCursor} className={classNames('tl-overlays__item', className)}>
 			<svg className="tl-cursor">
 				<use href="#cursor" color={color} />
 			</svg>
-			{name !== null && name !== '' && (
+			{chatMessage ? (
-				<div className="tl-nametag" style={{ backgroundColor: color }}>
+				<>
-					{name}
+					{name && (
-				</div>
+						<div className="tl-nametag-title" style={{ color }}>
+							{name}
+						</div>
+					)}
+					<div className="tl-nametag-chat" style={{ backgroundColor: color }}>
+						{chatMessage}
+					</div>
+				</>
+			) : (
+				name && (
+					<div className="tl-nametag" style={{ backgroundColor: color }}>
+						{name}
+					</div>
+				)
 			)}
 		</div>
 	)

packages/editor/src/lib/components/LiveCollaborators.tsx

@@ -33,7 +33,7 @@ const Collaborator = track(function Collaborator({ userId }: { userId: string })
 	// if the collaborator is on another page, ignore them
 	if (latestPresence.currentPageId !== editor.currentPageId) return null
 
-	const { brush, scribble, selectedIds, userName, cursor, color } = latestPresence
+	const { brush, scribble, selectedIds, userName, cursor, color, chatMessage } = latestPresence
 
 	// Add a little padding to the top-left of the viewport
 	// so that the cursor doesn't get cut off
@@ -63,6 +63,7 @@ const Collaborator = track(function Collaborator({ userId }: { userId: string })
 					color={color}
 					zoom={zoomLevel}
 					name={userName !== 'New User' ? userName : null}
+					chatMessage={chatMessage}
 				/>
 			) : CollaboratorHint ? (
 				<CollaboratorHint

packages/tlschema/api-report.md

@@ -941,6 +941,8 @@ export interface TLInstance extends BaseRecord<'instance', TLInstanceId> {
     // (undocumented)
     brush: Box2dModel | null;
     // (undocumented)
+    chatMessage: string;
+    // (undocumented)
     currentPageId: TLPageId;
     // (undocumented)
     cursor: TLCursor;
@@ -949,6 +951,8 @@ export interface TLInstance extends BaseRecord<'instance', TLInstanceId> {
     // (undocumented)
     followingUserId: null | string;
     // (undocumented)
+    isChatting: boolean;
+    // (undocumented)
     isDebugMode: boolean;
     // (undocumented)
     isFocusMode: boolean;
@@ -1007,6 +1011,8 @@ export interface TLInstancePresence extends BaseRecord<'instance_presence', TLIn
         z: number;
     };
     // (undocumented)
+    chatMessage: string;
+    // (undocumented)
     color: string;
     // (undocumented)
     currentPageId: TLPageId;

packages/tlschema/src/createPresenceStateDerivation.ts

@@ -43,6 +43,7 @@ export const createPresenceStateDerivation =
 				},
 				lastActivityTimestamp: pointer.lastActivityTimestamp,
 				screenBounds: instance.screenBounds,
+				chatMessage: instance.chatMessage,
 			})
 		})
 	}

packages/tlschema/src/migrations.test.ts

@@ -1110,6 +1110,30 @@ describe('hoist opacity', () => {
 	})
 })
 
+describe('Adds chat message to presence', () => {
+	const { up, down } = instancePresenceMigrations.migrators[3]
+
+	test('up adds the chatMessage property', () => {
+		expect(up({})).toEqual({ chatMessage: '' })
+	})
+
+	test('down removes the chatMessage property', () => {
+		expect(down({ chatMessage: '' })).toEqual({})
+	})
+})
+
+describe('Adds chat properties to instance', () => {
+	const { up, down } = instanceMigrations.migrators[14]
+
+	test('up adds the chatMessage property', () => {
+		expect(up({})).toEqual({ chatMessage: '', isChatting: false })
+	})
+
+	test('down removes the chatMessage property', () => {
+		expect(down({ chatMessage: '', isChatting: true })).toEqual({})
+	})
+})
+
 describe('Removes does resize from embed', () => {
 	const { up, down } = embedShapeMigrations.migrators[2]
 	test('up works as expected', () => {

packages/tlschema/src/records/TLInstance.ts

@@ -44,6 +44,10 @@ export interface TLInstance extends BaseRecord<'instance', TLInstanceId> {
 	exportBackground: boolean
 	screenBounds: Box2dModel
 	zoomBrush: Box2dModel | null
+
+	chatMessage: string
+	isChatting: boolean
+
 	isPenMode: boolean
 	isGridMode: boolean
 }
@@ -87,6 +91,8 @@ export const instanceTypeValidator: T.Validator<TLInstance> = T.model(
 		exportBackground: T.boolean,
 		screenBounds: T.boxModel,
 		zoomBrush: T.boxModel.nullable(),
+		chatMessage: T.string,
+		isChatting: T.boolean,
 		isPenMode: T.boolean,
 		isGridMode: T.boolean,
 	})
@@ -106,13 +112,14 @@ const Versions = {
 	RemoveUserId: 11,
 	AddIsPenModeAndIsGridMode: 12,
 	HoistOpacity: 13,
+	AddChat: 14,
 } as const
 
 export { Versions as instanceTypeVersions }
 
 /** @public */
 export const instanceMigrations = defineMigrations({
-	currentVersion: Versions.HoistOpacity,
+	currentVersion: Versions.AddChat,
 	migrators: {
 		[Versions.AddTransparentExportBgs]: {
 			up: (instance: TLInstance) => {
@@ -281,6 +288,14 @@ export const instanceMigrations = defineMigrations({
 				}
 			},
 		},
+		[Versions.AddChat]: {
+			up: (instance: TLInstance) => {
+				return { ...instance, chatMessage: '', isChatting: false }
+			},
+			down: ({ chatMessage: _, isChatting: __, ...instance }: TLInstance) => {
+				return instance
+			},
+		},
 	},
 })
 
@@ -321,6 +336,8 @@ export const InstanceRecordType = createRecordType<TLInstance>('instance', {
 		isToolLocked: false,
 		screenBounds: { x: 0, y: 0, w: 1080, h: 720 },
 		zoomBrush: null,
+		chatMessage: '',
+		isChatting: false,
 		isGridMode: false,
 		isPenMode: false,
 	})

packages/tlschema/src/records/TLPresence.ts

@@ -27,6 +27,7 @@ export interface TLInstancePresence extends BaseRecord<'instance_presence', TLIn
 		type: TLCursor['type']
 		rotation: number
 	}
+	chatMessage: string
 }
 
 /** @public */
@@ -59,18 +60,20 @@ export const instancePresenceValidator: T.Validator<TLInstancePresence> = T.mode
 		currentPageId: idValidator<TLPageId>('page'),
 		brush: T.boxModel.nullable(),
 		scribble: scribbleValidator.nullable(),
+		chatMessage: T.string,
 	})
 )
 
 const Versions = {
 	AddScribbleDelay: 1,
 	RemoveInstanceId: 2,
+	AddChatMessage: 3,
 } as const
 
 export { Versions as instancePresenceVersions }
 
 export const instancePresenceMigrations = defineMigrations({
-	currentVersion: Versions.RemoveInstanceId,
+	currentVersion: Versions.AddChatMessage,
 	migrators: {
 		[Versions.AddScribbleDelay]: {
 			up: (instance) => {
@@ -95,6 +98,14 @@ export const instancePresenceMigrations = defineMigrations({
 				return { ...instance, instanceId: TLINSTANCE_ID }
 			},
 		},
+		[Versions.AddChatMessage]: {
+			up: (instance) => {
+				return { ...instance, chatMessage: '' }
+			},
+			down: ({ chatMessage: _, ...instance }) => {
+				return instance
+			},
+		},
 	},
 })
 
@@ -130,4 +141,5 @@ export const InstancePresenceRecordType = createRecordType<TLInstancePresence>(
 	selectedIds: [],
 	brush: null,
 	scribble: null,
+	chatMessage: '',
 }))

packages/ui/src/lib/hooks/useEventsProvider.tsx

@@ -81,6 +81,7 @@ export interface TLUiEventMap {
 	'toggle-reduce-motion': null
 	'exit-pen-mode': null
 	'stop-following': null
+	'open-cursor-chat': null
 }
 
 type Join<T, K> = K extends null

packages/ui/src/lib/hooks/useTranslation/TLUiTranslationKey.ts

@@ -50,6 +50,7 @@ export type TLUiTranslationKey =
 	| 'action.leave-shared-project'
 	| 'action.new-project'
 	| 'action.new-shared-project'
+	| 'action.open-cursor-chat'
 	| 'action.open-file'
 	| 'action.pack'
 	| 'action.paste'
@@ -282,6 +283,7 @@ export type TLUiTranslationKey =
 	| 'shortcuts-dialog.tools'
 	| 'shortcuts-dialog.transform'
 	| 'shortcuts-dialog.view'
+	| 'shortcuts-dialog.collaboration'
 	| 'home-project-dialog.title'
 	| 'home-project-dialog.description'
 	| 'rename-project-dialog.title'
@@ -344,3 +346,4 @@ export type TLUiTranslationKey =
 	| 'vscode.file-open.backup-saved'
 	| 'vscode.file-open.backup-failed'
 	| 'vscode.file-open.dont-show-again'
+	| 'cursor-chat.type-to-chat'

packages/ui/src/lib/hooks/useTranslation/defaultTranslation.ts

@@ -50,6 +50,7 @@ export const DEFAULT_TRANSLATION = {
 	'action.leave-shared-project': 'Leave shared project',
 	'action.new-project': 'New project',
 	'action.new-shared-project': 'New shared project',
+	'action.open-cursor-chat': 'Cursor chat',
 	'action.open-file': 'Open file',
 	'action.pack': 'Pack',
 	'action.paste': 'Paste',
@@ -285,6 +286,7 @@ export const DEFAULT_TRANSLATION = {
 	'shortcuts-dialog.tools': 'Tools',
 	'shortcuts-dialog.transform': 'Transform',
 	'shortcuts-dialog.view': 'View',
+	'shortcuts-dialog.collaboration': 'Collaboration',
 	'home-project-dialog.title': 'Home project',
 	'home-project-dialog.description': "This is your local home project. It's just for you!",
 	'rename-project-dialog.title': 'Rename project',
@@ -354,4 +356,5 @@ export const DEFAULT_TRANSLATION = {
 	'vscode.file-open.backup-saved': 'Backup saved',
 	'vscode.file-open.backup-failed': 'Backup failed: this is not a .tldr file.',
 	'vscode.file-open.dont-show-again': "Don't ask again",
+	'cursor-chat.type-to-chat': 'Type to chat...',
 }

packages/ui/ui.css

@@ -3,6 +3,7 @@
 	--layer-menus: 400;
 	--layer-overlays: 500;
 	--layer-toasts: 650;
+	--layer-cursor: 700;
 }
 
 /* --------------------- Layout --------------------- */