Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 | 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 1x 1x 1x 1x 1x 5x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 4x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 5x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x 2x | import { writable } from '../store/index.js';
import { loop } from '../internal/client/loop.js';
import { raf } from '../internal/client/timing.js';
import { is_date } from './utils.js';
import { set, source } from '../internal/client/reactivity/sources.js';
import { render_effect } from '../internal/client/reactivity/effects.js';
import { get } from '../internal/client/runtime.js';
import { deferred, noop } from '../internal/shared/utils.js';
/**
* @template T
* @param {import('./private').TickContext<T>} ctx
* @param {T} last_value
* @param {T} current_value
* @param {T} target_value
* @returns {T}
*/
function tick_spring(ctx, last_value, current_value, target_value) {
if (typeof current_value === 'number' || is_date(current_value)) {
// @ts-ignore
const delta = target_value - current_value;
// @ts-ignore
const velocity = (current_value - last_value) / (ctx.dt || 1 / 60); // guard div by 0
const spring = ctx.opts.stiffness * delta;
const damper = ctx.opts.damping * velocity;
const acceleration = (spring - damper) * ctx.inv_mass;
const d = (velocity + acceleration) * ctx.dt;
if (Math.abs(d) < ctx.opts.precision && Math.abs(delta) < ctx.opts.precision) {
return target_value; // settled
} else {
ctx.settled = false; // signal loop to keep ticking
// @ts-ignore
return is_date(current_value) ? new Date(current_value.getTime() + d) : current_value + d;
}
} else if (Array.isArray(current_value)) {
// @ts-ignore
return current_value.map((_, i) =>
// @ts-ignore
tick_spring(ctx, last_value[i], current_value[i], target_value[i])
);
} else if (typeof current_value === 'object') {
const next_value = {};
for (const k in current_value) {
// @ts-ignore
next_value[k] = tick_spring(ctx, last_value[k], current_value[k], target_value[k]);
}
// @ts-ignore
return next_value;
} else {
throw new Error(`Cannot spring ${typeof current_value} values`);
}
}
/**
* The spring function in Svelte creates a store whose value is animated, with a motion that simulates the behavior of a spring. This means when the value changes, instead of transitioning at a steady rate, it "bounces" like a spring would, depending on the physics parameters provided. This adds a level of realism to the transitions and can enhance the user experience.
*
* https://svelte.dev/docs/svelte-motion#spring
* @template [T=any]
* @param {T} [value]
* @param {import('./private').SpringOpts} [opts]
* @returns {import('./public.js').Spring<T>}
*/
export function spring(value, opts = {}) {
const store = writable(value);
const { stiffness = 0.15, damping = 0.8, precision = 0.01 } = opts;
/** @type {number} */
let last_time;
/** @type {import('../internal/client/types').Task | null} */
let task;
/** @type {object} */
let current_token;
let last_value = /** @type {T} */ (value);
let target_value = /** @type {T | undefined} */ (value);
let inv_mass = 1;
let inv_mass_recovery_rate = 0;
let cancel_task = false;
/**
* @param {T} new_value
* @param {import('./private').SpringUpdateOpts} opts
* @returns {Promise<void>}
*/
function set(new_value, opts = {}) {
target_value = new_value;
const token = (current_token = {});
if (value == null || opts.hard || (spring.stiffness >= 1 && spring.damping >= 1)) {
cancel_task = true; // cancel any running animation
last_time = raf.now();
last_value = new_value;
store.set((value = target_value));
return Promise.resolve();
} else if (opts.soft) {
const rate = opts.soft === true ? 0.5 : +opts.soft;
inv_mass_recovery_rate = 1 / (rate * 60);
inv_mass = 0; // infinite mass, unaffected by spring forces
}
if (!task) {
last_time = raf.now();
cancel_task = false;
task = loop((now) => {
if (cancel_task) {
cancel_task = false;
task = null;
return false;
}
inv_mass = Math.min(inv_mass + inv_mass_recovery_rate, 1);
/** @type {import('./private').TickContext<T>} */
const ctx = {
inv_mass,
opts: spring,
settled: true,
dt: ((now - last_time) * 60) / 1000
};
// @ts-ignore
const next_value = tick_spring(ctx, last_value, value, target_value);
last_time = now;
last_value = /** @type {T} */ (value);
store.set((value = /** @type {T} */ (next_value)));
if (ctx.settled) {
task = null;
}
return !ctx.settled;
});
}
return new Promise((fulfil) => {
/** @type {import('../internal/client/types').Task} */ (task).promise.then(() => {
if (token === current_token) fulfil();
});
});
}
/** @type {import('./public.js').Spring<T>} */
const spring = {
set,
update: (fn, opts) => set(fn(/** @type {T} */ (target_value), /** @type {T} */ (value)), opts),
subscribe: store.subscribe,
stiffness,
damping,
precision
};
return spring;
}
/**
* @template T
*/
export class Spring {
#stiffness = source(0.15);
#damping = source(0.8);
#precision = source(0.01);
#current = source(/** @type {T} */ (undefined));
#target_value = /** @type {T} */ (undefined);
#last_value = /** @type {T} */ (undefined);
#last_time = 0;
#inverse_mass = 1;
#momentum = 0;
/** @type {import('../internal/client/types').Task | null} */
#task = null;
/** @type {PromiseWithResolvers<any> | null} */
#deferred = null;
/**
* @param {T | (() => T)} value
* @param {{ stiffness?: number, damping?: number, precision?: number }} [options]
*/
constructor(value, options = {}) {
if (typeof value === 'function') {
render_effect(() => {
this.#update(/** @type {() => T} */ (value)());
});
} else {
this.#current.v = this.#target_value = value;
}
if (typeof options.stiffness === 'number') this.#stiffness.v = clamp(options.stiffness, 0, 1);
if (typeof options.damping === 'number') this.#damping.v = clamp(options.damping, 0, 1);
if (typeof options.precision === 'number') this.#precision.v = options.precision;
}
/** @param {T} value */
#update(value) {
this.#target_value = value;
this.#current.v ??= value;
this.#last_value ??= this.#current.v;
if (!this.#task) {
this.#last_time = raf.now();
var inv_mass_recovery_rate = 1 / (this.#momentum * 60);
this.#task ??= loop((now) => {
this.#inverse_mass = Math.min(this.#inverse_mass + inv_mass_recovery_rate, 1);
/** @type {import('./private').TickContext<T>} */
const ctx = {
inv_mass: this.#inverse_mass,
opts: {
stiffness: this.#stiffness.v,
damping: this.#damping.v,
precision: this.#precision.v
},
settled: true,
dt: ((now - this.#last_time) * 60) / 1000
};
var next = tick_spring(ctx, this.#last_value, this.#current.v, this.#target_value);
this.#last_value = this.#current.v;
this.#last_time = now;
set(this.#current, next);
if (ctx.settled) {
this.#task = null;
}
return !ctx.settled;
});
}
return this.#task.promise;
}
/**
* @param {T} value
* @param {{ instant?: boolean; preserveMomentum?: number }} [options]
*/
set(value, options) {
this.#deferred?.reject(new Error('Aborted'));
if (options?.instant || this.#current.v === undefined) {
this.#task?.abort();
this.#task = null;
set(this.#current, (this.#target_value = value));
return Promise.resolve();
}
if (options?.preserveMomentum) {
this.#inverse_mass = 0;
this.#momentum = options.preserveMomentum;
}
var d = (this.#deferred = deferred());
d.promise.catch(noop);
this.#update(value).then(() => {
if (d !== this.#deferred) return;
d.resolve(undefined);
});
return d.promise;
}
get current() {
return get(this.#current);
}
get damping() {
return get(this.#damping);
}
set damping(v) {
set(this.#damping, clamp(v, 0, 1));
}
get precision() {
return get(this.#precision);
}
set precision(v) {
set(this.#precision, v);
}
get stiffness() {
return get(this.#stiffness);
}
set stiffness(v) {
set(this.#stiffness, clamp(v, 0, 1));
}
}
/**
* @param {number} n
* @param {number} min
* @param {number} max
*/
function clamp(n, min, max) {
return Math.max(min, Math.min(max, n));
}
|