60 lines
1.6 KiB
TypeScript
60 lines
1.6 KiB
TypeScript
/*
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* SPDX-FileCopyrightText: syuilo and misskey-project
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* SPDX-License-Identifier: AGPL-3.0-only
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*/
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const requestIdleCallback: typeof globalThis.requestIdleCallback = globalThis.requestIdleCallback ?? ((callback) => {
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const start = performance.now();
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const timeoutId = setTimeout(() => {
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callback({
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didTimeout: false, // polyfill でタイムアウト発火することはない
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timeRemaining() {
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const diff = performance.now() - start;
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return Math.max(0, 50 - diff); // <https://www.w3.org/TR/requestidlecallback/#idle-periods>
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},
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});
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});
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return timeoutId;
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});
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const cancelIdleCallback: typeof globalThis.cancelIdleCallback = globalThis.cancelIdleCallback ?? ((timeoutId) => {
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clearTimeout(timeoutId);
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});
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class IdlingRenderScheduler {
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#renderers: Set<FrameRequestCallback>;
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#rafId: number;
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#ricId: number;
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constructor() {
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this.#renderers = new Set();
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this.#rafId = 0;
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this.#ricId = requestIdleCallback((deadline) => this.#schedule(deadline));
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}
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#schedule(deadline: IdleDeadline): void {
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if (deadline.timeRemaining()) {
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this.#rafId = requestAnimationFrame((time) => {
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for (const renderer of this.#renderers) {
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renderer(time);
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}
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});
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}
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this.#ricId = requestIdleCallback((arg) => this.#schedule(arg));
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}
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add(renderer: FrameRequestCallback): void {
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this.#renderers.add(renderer);
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}
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delete(renderer: FrameRequestCallback): void {
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this.#renderers.delete(renderer);
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}
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dispose(): void {
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this.#renderers.clear();
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cancelAnimationFrame(this.#rafId);
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cancelIdleCallback(this.#ricId);
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}
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}
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export const defaultIdlingRenderScheduler = new IdlingRenderScheduler();
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