@tamagui/react-native-web-lite
Version:
React Native for Web
189 lines • 6.39 kB
JavaScript
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
for (var name in all) __defProp(target, name, {
get: all[name],
enumerable: true
});
};
var __copyProps = (to, from, except, desc) => {
if (from && typeof from === "object" || typeof from === "function") {
for (let key of __getOwnPropNames(from)) if (!__hasOwnProp.call(to, key) && key !== except) __defProp(to, key, {
get: () => from[key],
enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable
});
}
return to;
};
var __toCommonJS = mod => __copyProps(__defProp({}, "__esModule", {
value: true
}), mod);
var FillRateHelper_exports = {};
__export(FillRateHelper_exports, {
FillRateHelper: () => FillRateHelper,
default: () => FillRateHelper_default
});
module.exports = __toCommonJS(FillRateHelper_exports);
class Info {
any_blank_count = 0;
any_blank_ms = 0;
any_blank_speed_sum = 0;
mostly_blank_count = 0;
mostly_blank_ms = 0;
pixels_blank = 0;
pixels_sampled = 0;
pixels_scrolled = 0;
total_time_spent = 0;
sample_count = 0;
}
const DEBUG = false;
let _listeners = [];
let _minSampleCount = 10;
let _sampleRate = DEBUG ? 1 : null;
class FillRateHelper {
_anyBlankStartTime = null;
_enabled = false;
_getFrameMetrics;
_info = new Info();
_mostlyBlankStartTime = null;
_samplesStartTime = null;
static addListener(callback) {
if (_sampleRate === null) {
console.warn("Call `FillRateHelper.setSampleRate` before `addListener`.");
}
_listeners.push(callback);
return {
remove: () => {
_listeners = _listeners.filter(listener => callback !== listener);
}
};
}
static setSampleRate(sampleRate) {
_sampleRate = sampleRate;
}
static setMinSampleCount(minSampleCount) {
_minSampleCount = minSampleCount;
}
constructor(getFrameMetrics) {
this._getFrameMetrics = getFrameMetrics;
this._enabled = (_sampleRate || 0) > Math.random();
this._resetData();
}
activate() {
if (this._enabled && this._samplesStartTime == null) {
DEBUG && console.debug("FillRateHelper: activate");
this._samplesStartTime = global.performance.now();
}
}
deactivateAndFlush() {
if (!this._enabled) {
return;
}
const start = this._samplesStartTime;
if (start == null) {
DEBUG && console.debug("FillRateHelper: bail on deactivate with no start time");
return;
}
if (this._info.sample_count < _minSampleCount) {
this._resetData();
return;
}
const total_time_spent = global.performance.now() - start;
const info = {
...this._info,
total_time_spent
};
if (DEBUG) {
const derived = {
avg_blankness: this._info.pixels_blank / this._info.pixels_sampled,
avg_speed: this._info.pixels_scrolled / (total_time_spent / 1e3),
avg_speed_when_any_blank: this._info.any_blank_speed_sum / this._info.any_blank_count,
any_blank_per_min: this._info.any_blank_count / (total_time_spent / 1e3 / 60),
any_blank_time_frac: this._info.any_blank_ms / total_time_spent,
mostly_blank_per_min: this._info.mostly_blank_count / (total_time_spent / 1e3 / 60),
mostly_blank_time_frac: this._info.mostly_blank_ms / total_time_spent
};
for (const key in derived) {
derived[key] = Math.round(1e3 * derived[key]) / 1e3;
}
console.debug("FillRateHelper deactivateAndFlush: ", {
derived,
info
});
}
_listeners.forEach(listener => listener(info));
this._resetData();
}
computeBlankness(props, cellsAroundViewport, scrollMetrics) {
if (!this._enabled || props.getItemCount(props.data) === 0 || cellsAroundViewport.last < cellsAroundViewport.first || this._samplesStartTime == null) {
return 0;
}
const {
dOffset,
offset,
velocity,
visibleLength
} = scrollMetrics;
this._info.sample_count++;
this._info.pixels_sampled += Math.round(visibleLength);
this._info.pixels_scrolled += Math.round(Math.abs(dOffset));
const scrollSpeed = Math.round(Math.abs(velocity) * 1e3);
const now = global.performance.now();
if (this._anyBlankStartTime != null) {
this._info.any_blank_ms += now - this._anyBlankStartTime;
}
this._anyBlankStartTime = null;
if (this._mostlyBlankStartTime != null) {
this._info.mostly_blank_ms += now - this._mostlyBlankStartTime;
}
this._mostlyBlankStartTime = null;
let blankTop = 0;
let first = cellsAroundViewport.first;
let firstFrame = this._getFrameMetrics(first, props);
while (first <= cellsAroundViewport.last && (!firstFrame || !firstFrame.inLayout)) {
firstFrame = this._getFrameMetrics(first, props);
first++;
}
if (firstFrame && first > 0) {
blankTop = Math.min(visibleLength, Math.max(0, firstFrame.offset - offset));
}
let blankBottom = 0;
let last = cellsAroundViewport.last;
let lastFrame = this._getFrameMetrics(last, props);
while (last >= cellsAroundViewport.first && (!lastFrame || !lastFrame.inLayout)) {
lastFrame = this._getFrameMetrics(last, props);
last--;
}
if (lastFrame && last < props.getItemCount(props.data) - 1) {
const bottomEdge = lastFrame.offset + lastFrame.length;
blankBottom = Math.min(visibleLength, Math.max(0, offset + visibleLength - bottomEdge));
}
const pixels_blank = Math.round(blankTop + blankBottom);
const blankness = pixels_blank / visibleLength;
if (blankness > 0) {
this._anyBlankStartTime = now;
this._info.any_blank_speed_sum += scrollSpeed;
this._info.any_blank_count++;
this._info.pixels_blank += pixels_blank;
if (blankness > 0.5) {
this._mostlyBlankStartTime = now;
this._info.mostly_blank_count++;
}
} else if (scrollSpeed < 0.01 || Math.abs(dOffset) < 1) {
this.deactivateAndFlush();
}
return blankness;
}
enabled() {
return this._enabled;
}
_resetData() {
this._anyBlankStartTime = null;
this._info = new Info();
this._mostlyBlankStartTime = null;
this._samplesStartTime = null;
}
}
var FillRateHelper_default = FillRateHelper;