@react-native-ohos/flash-list
Version:
FlashList is a more performant FlatList replacement
88 lines • 3.87 kB
JavaScript
"use strict";
/**
* MIT License
*
* Copyright (C) 2024 Huawei Device Co., Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.JSFPSMonitor = void 0;
var roundToDecimalPlaces_1 = require("./roundToDecimalPlaces");
/**
* Can be used to monitor JS thread performance
* Use startTracking() and stopAndGetData() to start and stop tracking
*/
var JSFPSMonitor = /** @class */ (function () {
function JSFPSMonitor() {
var _this = this;
this.startTime = 0;
this.frameCount = 0;
this.timeWindow = {
frameCount: 0,
startTime: 0,
};
this.minFPS = Number.MAX_SAFE_INTEGER;
this.maxFPS = 0;
this.averageFPS = 0;
this.clearAnimationNumber = 0;
this.updateLoopCompute = function () {
_this.frameCount++;
var elapsedTime = (Date.now() - _this.startTime) / 1000;
_this.averageFPS = elapsedTime > 0 ? _this.frameCount / elapsedTime : 0;
_this.timeWindow.frameCount++;
var timeWindowElapsedTime = (Date.now() - _this.timeWindow.startTime) / 1000;
if (timeWindowElapsedTime >= 1) {
var timeWindowAverageFPS = _this.timeWindow.frameCount / timeWindowElapsedTime;
_this.minFPS = Math.min(_this.minFPS, timeWindowAverageFPS);
_this.maxFPS = Math.max(_this.maxFPS, timeWindowAverageFPS);
_this.timeWindow.frameCount = 0;
_this.timeWindow.startTime = Date.now();
}
_this.measureLoop();
};
}
JSFPSMonitor.prototype.measureLoop = function () {
// This looks weird but I'm avoiding a new closure
this.clearAnimationNumber = requestAnimationFrame(this.updateLoopCompute);
};
JSFPSMonitor.prototype.startTracking = function () {
if (this.startTime !== 0) {
throw new Error("This FPS Monitor has already been run, please create a new instance");
}
this.startTime = Date.now();
this.timeWindow.startTime = Date.now();
this.measureLoop();
};
JSFPSMonitor.prototype.stopAndGetData = function () {
cancelAnimationFrame(this.clearAnimationNumber);
if (this.minFPS === Number.MAX_SAFE_INTEGER) {
this.minFPS = this.averageFPS;
this.maxFPS = this.averageFPS;
}
return {
minFPS: (0, roundToDecimalPlaces_1.roundToDecimalPlaces)(this.minFPS, 1),
maxFPS: (0, roundToDecimalPlaces_1.roundToDecimalPlaces)(this.maxFPS, 1),
averageFPS: (0, roundToDecimalPlaces_1.roundToDecimalPlaces)(this.averageFPS, 1),
};
};
return JSFPSMonitor;
}());
exports.JSFPSMonitor = JSFPSMonitor;
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