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f72d9dd08b
Summary: If tracking is enabled and the sampling check passes on a scroll or layout event, we compare the scroll offset to the layout of the rendered items. If the items don't cover the visible area of the list, we fire an `onFillRateExceeded` call with relevant stats for logging the event through an analytics pipeline. The measurement methodology is a little jank because everything is async, but it seems directionally useful for getting ballpark numbers, catching regressions, and tracking improvements. Benchmark testing shows a ~2014 MotoX starts hitting the fill rate limit at about 2500 px / sec, which is pretty fast scrolling. This also reworks our frame rate stuff so we can use a shared `SceneTracking` thing and track blankness globally. Reviewed By: bvaughn Differential Revision: D4806867 fbshipit-source-id: 119bf177463c8c3aa51fa13d1a9d03b1a96042aa
42 lines
989 B
JavaScript
42 lines
989 B
JavaScript
/**
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* Copyright (c) 2015-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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* @providesModule SceneTracker
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* @flow
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*/
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'use strict';
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type Scene = {name: string};
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let _listeners: Array<(scene: Scene) => void> = [];
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let _activeScene = {name: 'default'};
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const SceneTracker = {
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setActiveScene(scene: Scene) {
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_activeScene = scene;
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_listeners.forEach((listener) => listener(_activeScene));
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},
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getActiveScene(): Scene {
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return _activeScene;
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},
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addActiveSceneChangedListener(callback: (scene: Scene) => void): {remove: () => void} {
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_listeners.push(callback);
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return {
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remove: () => {
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_listeners = _listeners.filter((listener) => callback !== listener);
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},
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};
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},
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};
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module.exports = SceneTracker;
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