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/** @import { Tweened } from './public' */
/** @import { TweenedOptions } from './private' */
import { writable } from '../store/index.js';
import { raf } from '../internal/client/timing.js';
import { loop } from '../internal/client/loop.js';
import { linear } from '../easing/index.js';
import { is_date } from './utils.js';
/**
* @template T
* @param {T} a
* @param {T} b
* @returns {(t: number) => T}
*/
function get_interpolator(a, b) {
if (a === b || a !== a) return () => a;
const type = typeof a;
if (type !== typeof b || Array.isArray(a) !== Array.isArray(b)) {
throw new Error('Cannot interpolate values of different type');
}
if (Array.isArray(a)) {
const arr = /** @type {Array<any>} */ (b).map((bi, i) => {
return get_interpolator(/** @type {Array<any>} */ (a)[i], bi);
});
// @ts-ignore
return (t) => arr.map((fn) => fn(t));
}
if (type === 'object') {
if (!a || !b) {
throw new Error('Object cannot be null');
}
if (is_date(a) && is_date(b)) {
const an = a.getTime();
const bn = b.getTime();
const delta = bn - an;
// @ts-ignore
return (t) => new Date(an + t * delta);
}
const keys = Object.keys(b);
/** @type {Record<string, (t: number) => T>} */
const interpolators = {};
keys.forEach((key) => {
// @ts-ignore
interpolators[key] = get_interpolator(a[key], b[key]);
});
// @ts-ignore
return (t) => {
/** @type {Record<string, any>} */
const result = {};
keys.forEach((key) => {
result[key] = interpolators[key](t);
});
return result;
};
}
if (type === 'number') {
const delta = /** @type {number} */ (b) - /** @type {number} */ (a);
// @ts-ignore
return (t) => a + t * delta;
}
throw new Error(`Cannot interpolate ${type} values`);
}
/**
* A tweened store in Svelte is a special type of store that provides smooth transitions between state values over time.
*
* https://svelte.dev/docs/svelte-motion#tweened
* @template T
* @param {T} [value]
* @param {TweenedOptions<T>} [defaults]
* @returns {Tweened<T>}
*/
export function tweened(value, defaults = {}) {
const store = writable(value);
/** @type {Task} */
let task;
let target_value = value;
/**
* @param {T} new_value
* @param {TweenedOptions<T>} [opts]
*/
function set(new_value, opts) {
target_value = new_value;
if (value == null) {
store.set((value = new_value));
return Promise.resolve();
}
/** @type {Task | null} */
let previous_task = task;
let started = false;
let {
delay = 0,
duration = 400,
easing = linear,
interpolate = get_interpolator
} = { ...defaults, ...opts };
if (duration === 0) {
if (previous_task) {
previous_task.abort();
previous_task = null;
}
store.set((value = target_value));
return Promise.resolve();
}
const start = raf.now() + delay;
/** @type {(t: number) => T} */
let fn;
task = loop((now) => {
if (now < start) return true;
if (!started) {
fn = interpolate(/** @type {any} */ (value), new_value);
if (typeof duration === 'function')
duration = duration(/** @type {any} */ (value), new_value);
started = true;
}
if (previous_task) {
previous_task.abort();
previous_task = null;
}
const elapsed = now - start;
if (elapsed > /** @type {number} */ (duration)) {
store.set((value = new_value));
return false;
}
// @ts-ignore
store.set((value = fn(easing(elapsed / duration))));
return true;
});
return task.promise;
}
return {
set,
update: (fn, opts) =>
set(fn(/** @type {any} */ (target_value), /** @type {any} */ (value)), opts),
subscribe: store.subscribe
};
}
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