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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 | 46x 46x 46x 46x 452x 46x 452x 452x 452x 452x 452x 452x 452x 452x 452x 46x 575x 46x 46x 527x 527x 46x 6x 6525x 3441x 3438x 3x 3444x 3441x 3441x 3441x 3441x 2576x 2576x 2576x 3441x 2978x 3441x 23x 3441x 3084x 46x 3275x 46x 46x 1081x 2496x 2407x 2407x 184x 184x 452x 338x 338x 338x 338x 338x 235x 46x 423x 423x 46x 46x 658x 46x 46x 46x 450x | import sync, { getFrameData, FrameData } from "framesync" import { velocityPerSecond } from "popmotion" import { SubscriptionManager } from "../utils/subscription-manager" export type Transformer<T> = (v: T) => T /** * @public */ export type Subscriber<T> = (v: T) => void /** * @public */ export type PassiveEffect<T> = (v: T, safeSetter: (v: T) => void) => void export type StartAnimation = (complete: () => void) => () => void const isFloat = (value: any): value is string => { return !isNaN(parseFloat(value)) } /** * `MotionValue` is used to track the state and velocity of motion values. * * @public */ export class MotionValue<V = any> { /** * The current state of the `MotionValue`. * * @internal */ private current: V /** * The previous state of the `MotionValue`. * * @internal */ private prev: V /** * Duration, in milliseconds, since last updating frame. * * @internal */ private timeDelta: number = 0 /** * Timestamp of the last time this `MotionValue` was updated. * * @internal */ private lastUpdated: number = 0 /** * Functions to notify when the `MotionValue` updates. * * @internal */ private updateSubscribers = new SubscriptionManager<Subscriber<V>>() /** * Functions to notify when the velocity updates. * * @internal */ public velocityUpdateSubscribers = new SubscriptionManager< Subscriber<number> >() /** * Functions to notify when the `MotionValue` updates and `render` is set to `true`. * * @internal */ private renderSubscribers = new SubscriptionManager<Subscriber<V>>() /** * Add a passive effect to this `MotionValue`. * * A passive effect intercepts calls to `set`. For instance, `useSpring` adds * a passive effect that attaches a `spring` to the latest * set value. Hypothetically there could be a `useSmooth` that attaches an input smoothing effect. * * @internal */ private passiveEffect?: PassiveEffect<V> /** * A reference to the currently-controlling Popmotion animation * * @internal */ private stopAnimation?: null | (() => void) /** * Tracks whether this value can output a velocity. Currently this is only true * if the value is numerical, but we might be able to widen the scope here and support * other value types. * * @internal */ private canTrackVelocity = false /** * @param init - The initiating value * @param config - Optional configuration options * * - `transformer`: A function to transform incoming values with. * * @internal */ constructor(init: V) { this.prev = this.current = init this.canTrackVelocity = isFloat(this.current) } /** * Adds a function that will be notified when the `MotionValue` is updated. * * It returns a function that, when called, will cancel the subscription. * * When calling `onChange` inside a React component, it should be wrapped with the * `useEffect` hook. As it returns an unsubscribe function, this should be returned * from the `useEffect` function to ensure you don't add duplicate subscribers.. * * ```jsx * export const MyComponent = () => { * const x = useMotionValue(0) * const y = useMotionValue(0) * const opacity = useMotionValue(1) * * useEffect(() => { * function updateOpacity() { * const maxXY = Math.max(x.get(), y.get()) * const newOpacity = transform(maxXY, [0, 100], [1, 0]) * opacity.set(newOpacity) * } * * const unsubscribeX = x.onChange(updateOpacity) * const unsubscribeY = y.onChange(updateOpacity) * * return () => { * unsubscribeX() * unsubscribeY() * } * }, []) * * return <motion.div style={{ x }} /> * } * ``` * * @internalremarks * * We could look into a `useOnChange` hook if the above lifecycle management proves confusing. * * ```jsx * useOnChange(x, () => {}) * ``` * * @param subscriber - A function that receives the latest value. * @returns A function that, when called, will cancel this subscription. * * @public */ onChange(subscription: Subscriber<V>): () => void { return this.updateSubscribers.add(subscription) } clearListeners() { this.updateSubscribers.clear() } /** * Adds a function that will be notified when the `MotionValue` requests a render. * * @param subscriber - A function that's provided the latest value. * @returns A function that, when called, will cancel this subscription. * * @internal */ onRenderRequest(subscription: Subscriber<V>) { // Render immediately subscription(this.get()) return this.renderSubscribers.add(subscription) } /** * Attaches a passive effect to the `MotionValue`. * * @internal */ attach(passiveEffect: PassiveEffect<V>) { this.passiveEffect = passiveEffect } /** * Sets the state of the `MotionValue`. * * @remarks * * ```jsx * const x = useMotionValue(0) * x.set(10) * ``` * * @param latest - Latest value to set. * @param render - Whether to notify render subscribers. Defaults to `true` * * @public */ set(v: V, render = true) { if (!render || !this.passiveEffect) { this.updateAndNotify(v, render) } else { this.passiveEffect(v, this.updateAndNotify) } } updateAndNotify = (v: V, render = true) => { this.prev = this.current this.current = v // Update timestamp const { delta, timestamp } = getFrameData() if (this.lastUpdated !== timestamp) { this.timeDelta = delta this.lastUpdated = timestamp sync.postRender(this.scheduleVelocityCheck) } // Update update subscribers if (this.prev !== this.current) { this.updateSubscribers.notify(this.current) } // Update velocity subscribers if (this.velocityUpdateSubscribers.getSize()) { this.velocityUpdateSubscribers.notify(this.getVelocity()) } // Update render subscribers if (render) { this.renderSubscribers.notify(this.current) } } /** * Returns the latest state of `MotionValue` * * @returns - The latest state of `MotionValue` * * @public */ get() { return this.current } /** * @public */ getPrevious() { return this.prev } /** * Returns the latest velocity of `MotionValue` * * @returns - The latest velocity of `MotionValue`. Returns `0` if the state is non-numerical. * * @public */ getVelocity() { // This could be isFloat(this.prev) && isFloat(this.current), but that would be wasteful return this.canTrackVelocity ? // These casts could be avoided if parseFloat would be typed better velocityPerSecond( parseFloat(this.current as any) - parseFloat(this.prev as any), this.timeDelta ) : 0 } /** * Schedule a velocity check for the next frame. * * This is an instanced and bound function to prevent generating a new * function once per frame. * * @internal */ private scheduleVelocityCheck = () => sync.postRender(this.velocityCheck) /** * Updates `prev` with `current` if the value hasn't been updated this frame. * This ensures velocity calculations return `0`. * * This is an instanced and bound function to prevent generating a new * function once per frame. * * @internal */ private velocityCheck = ({ timestamp }: FrameData) => { if (timestamp !== this.lastUpdated) { this.prev = this.current this.velocityUpdateSubscribers.notify(this.getVelocity()) } } hasAnimated = false /** * Registers a new animation to control this `MotionValue`. Only one * animation can drive a `MotionValue` at one time. * * ```jsx * value.start() * ``` * * @param animation - A function that starts the provided animation * * @internal */ start(animation: StartAnimation) { this.stop() return new Promise<void>((resolve) => { this.hasAnimated = true this.stopAnimation = animation(resolve) }).then(() => this.clearAnimation()) } /** * Stop the currently active animation. * * @public */ stop() { if (this.stopAnimation) this.stopAnimation() this.clearAnimation() } /** * Returns `true` if this value is currently animating. * * @public */ isAnimating() { return !!this.stopAnimation } private clearAnimation() { this.stopAnimation = null } /** * Destroy and clean up subscribers to this `MotionValue`. * * The `MotionValue` hooks like `useMotionValue` and `useTransform` automatically * handle the lifecycle of the returned `MotionValue`, so this method is only necessary if you've manually * created a `MotionValue` via the `motionValue` function. * * @public */ destroy() { this.updateSubscribers.clear() this.renderSubscribers.clear() this.stop() } } /** * @internal */ export function motionValue<V>(init: V) { return new MotionValue<V>(init) } |