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

Reactive Extensions for modern JavaScript

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.animationFrames = void 0;
var Observable_1 = require("../../Observable");
var performanceTimestampProvider_1 = require("../../scheduler/performanceTimestampProvider");
var animationFrameProvider_1 = require("../../scheduler/animationFrameProvider");
function animationFrames(timestampProvider) {
    return timestampProvider ? animationFramesFactory(timestampProvider) : DEFAULT_ANIMATION_FRAMES;
}
exports.animationFrames = animationFrames;
function animationFramesFactory(timestampProvider) {
    return new Observable_1.Observable(function (subscriber) {
        var provider = timestampProvider || performanceTimestampProvider_1.performanceTimestampProvider;
        var start = provider.now();
        var id = 0;
        var run = function () {
            if (!subscriber.closed) {
                id = animationFrameProvider_1.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_1.animationFrameProvider.cancelAnimationFrame(id);
            }
        };
    });
}
var DEFAULT_ANIMATION_FRAMES = animationFramesFactory();
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