ui/node_modules/rxjs/dist/esm5/internal/observable/dom/animationFrames.js

import { Observable } from '../../Observable';
import { performanceTimestampProvider } from '../../scheduler/performanceTimestampProvider';
import { animationFrameProvider } from '../../scheduler/animationFrameProvider';
export function animationFrames(timestampProvider) {
    return timestampProvider ? animationFramesFactory(timestampProvider) : DEFAULT_ANIMATION_FRAMES;
}
function animationFramesFactory(timestampProvider) {
    return new Observable(function (subscriber) {
        var provider = timestampProvider || performanceTimestampProvider;
        var start = provider.now();
        var id = 0;
        var run = function () {
            if (!subscriber.closed) {
                id = animationFrameProvider.requestAnimationFrame(function (timestamp) {
                    id = 0;
                    var now = provider.now();
                    subscriber.next({
                        timestamp: timestampProvider ? now : timestamp,
                        elapsed: now - start,
                    });
                    run();
                });
            }
        };
        run();
        return function () {
            if (id) {
                animationFrameProvider.cancelAnimationFrame(id);
            }
        };
    });
}
var DEFAULT_ANIMATION_FRAMES = animationFramesFactory();
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