rxjs/dist/esm/internal/observable/dom/animationFrames.js

Reactive Extensions for modern JavaScript

import { Observable } from '../../Observable';
import { Subscription } from '../../Subscription';
import { performanceTimestampProvider } from '../../scheduler/performanceTimestampProvider';
import { animationFrameProvider } from '../../scheduler/animationFrameProvider';
export function animationFrames(timestampProvider) {
    return timestampProvider ? animationFramesFactory(timestampProvider) : DEFAULT_ANIMATION_FRAMES;
}
function animationFramesFactory(timestampProvider) {
    const { schedule } = animationFrameProvider;
    return new Observable(subscriber => {
        const subscription = new Subscription();
        const provider = timestampProvider || performanceTimestampProvider;
        const start = provider.now();
        const run = (timestamp) => {
            const now = provider.now();
            subscriber.next({
                timestamp: timestampProvider ? now : timestamp,
                elapsed: now - start
            });
            if (!subscriber.closed) {
                subscription.add(schedule(run));
            }
        };
        subscription.add(schedule(run));
        return subscription;
    });
}
const DEFAULT_ANIMATION_FRAMES = animationFramesFactory();
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