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derived={avg_blankness:this._info.pixels_blank/this._info.pixels_sampled,avg_speed:this._info.pixels_scrolled/(total_time_spent/1000),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/1000/60),any_blank_time_frac:this._info.any_blank_ms/total_time_spent,mostly_blank_per_min:this._info.mostly_blank_count/(total_time_spent/1000/60),mostly_blank_time_frac:this._info.mostly_blank_ms/total_time_spent};for(var key in derived){derived[key]=Math.round(1000*derived[key])/1000;}console.debug('FillRateHelper deactivateAndFlush: ',{derived:derived,info:info});}_listeners.forEach(function(listener){return listener(info);});this._resetData();};_proto.computeBlankness=function computeBlankness(props,state,scrollMetrics){if(!this._enabled||props.getItemCount(props.data)===0||this._samplesStartTime==null){return 0;}var 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_objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; var ownKeys = Object.keys(source); if (typeof Object.getOwnPropertySymbols === 'function') { ownKeys = ownKeys.concat(Object.getOwnPropertySymbols(source).filter(function (sym) { return Object.getOwnPropertyDescriptor(source, sym).enumerable; })); } ownKeys.forEach(function (key) { _defineProperty(target, key, source[key]); }); } return target; }\n\nfunction _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }\n\n/**\n * Copyright (c) 2015-present, Facebook, Inc.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n *\n * \n * @format\n */\nimport performanceNow from 'fbjs/lib/performanceNow';\nimport warning from 'fbjs/lib/warning';\n\nvar Info = function Info() {\n  this.any_blank_count = 0;\n  this.any_blank_ms = 0;\n  this.any_blank_speed_sum = 0;\n  this.mostly_blank_count = 0;\n  this.mostly_blank_ms = 0;\n  this.pixels_blank = 0;\n  this.pixels_sampled = 0;\n  this.pixels_scrolled = 0;\n  this.total_time_spent = 0;\n  this.sample_count = 0;\n};\n\nvar DEBUG = false;\nvar _listeners = [];\nvar _minSampleCount = 10;\n\nvar _sampleRate = DEBUG ? 1 : null;\n/**\n * A helper class for detecting when the maximem fill rate of `VirtualizedList` is exceeded.\n * By default the sampling rate is set to zero and this will do nothing. If you want to collect\n * samples (e.g. to log them), make sure to call `FillRateHelper.setSampleRate(0.0-1.0)`.\n *\n * Listeners and sample rate are global for all `VirtualizedList`s - typical usage will combine with\n * `SceneTracker.getActiveScene` to determine the context of the events.\n */\n\n\nvar FillRateHelper =\n/*#__PURE__*/\nfunction () {\n  FillRateHelper.addListener = function addListener(callback) {\n    warning(_sampleRate !== null, 'Call `FillRateHelper.setSampleRate` before `addListener`.');\n\n    _listeners.push(callback);\n\n    return {\n      remove: function remove() {\n        _listeners = _listeners.filter(function (listener) {\n          return callback !== listener;\n        });\n      }\n    };\n  };\n\n  FillRateHelper.setSampleRate = function setSampleRate(sampleRate) {\n    _sampleRate = sampleRate;\n  };\n\n  FillRateHelper.setMinSampleCount = function setMinSampleCount(minSampleCount) {\n    _minSampleCount = minSampleCount;\n  };\n\n  function FillRateHelper(getFrameMetrics) {\n    this._anyBlankStartTime = null;\n    this._enabled = false;\n    this._info = new Info();\n    this._mostlyBlankStartTime = null;\n    this._samplesStartTime = null;\n    this._getFrameMetrics = getFrameMetrics;\n    this._enabled = (_sampleRate || 0) > Math.random();\n\n    this._resetData();\n  }\n\n  var _proto = FillRateHelper.prototype;\n\n  _proto.activate = function activate() {\n    if (this._enabled && this._samplesStartTime == null) {\n      DEBUG && console.debug('FillRateHelper: activate');\n      this._samplesStartTime = performanceNow();\n    }\n  };\n\n  _proto.deactivateAndFlush = function deactivateAndFlush() {\n    if (!this._enabled) {\n      return;\n    }\n\n    var start = this._samplesStartTime; // const for flow\n\n    if (start == null) {\n      DEBUG && console.debug('FillRateHelper: bail on deactivate with no start time');\n      return;\n    }\n\n    if (this._info.sample_count < _minSampleCount) {\n      // Don't bother with under-sampled events.\n      this._resetData();\n\n      return;\n    }\n\n    var total_time_spent = performanceNow() - start;\n\n    var info = _objectSpread({}, this._info, {\n      total_time_spent: total_time_spent\n    });\n\n    if (DEBUG) {\n      var derived = {\n        avg_blankness: this._info.pixels_blank / this._info.pixels_sampled,\n        avg_speed: this._info.pixels_scrolled / (total_time_spent / 1000),\n        avg_speed_when_any_blank: this._info.any_blank_speed_sum / this._info.any_blank_count,\n        any_blank_per_min: this._info.any_blank_count / (total_time_spent / 1000 / 60),\n        any_blank_time_frac: this._info.any_blank_ms / total_time_spent,\n        mostly_blank_per_min: this._info.mostly_blank_count / (total_time_spent / 1000 / 60),\n        mostly_blank_time_frac: this._info.mostly_blank_ms / total_time_spent\n      };\n\n      for (var key in derived) {\n        derived[key] = Math.round(1000 * derived[key]) / 1000;\n      }\n\n      console.debug('FillRateHelper deactivateAndFlush: ', {\n        derived: derived,\n        info: info\n      });\n    }\n\n    _listeners.forEach(function (listener) {\n      return listener(info);\n    });\n\n    this._resetData();\n  };\n\n  _proto.computeBlankness = function computeBlankness(props, state, scrollMetrics) {\n    if (!this._enabled || props.getItemCount(props.data) === 0 || this._samplesStartTime == null) {\n      return 0;\n    }\n\n    var dOffset = scrollMetrics.dOffset,\n        offset = scrollMetrics.offset,\n        velocity = scrollMetrics.velocity,\n        visibleLength = scrollMetrics.visibleLength; // Denominator metrics that we track for all events - most of the time there is no blankness and\n    // we want to capture that.\n\n    this._info.sample_count++;\n    this._info.pixels_sampled += Math.round(visibleLength);\n    this._info.pixels_scrolled += Math.round(Math.abs(dOffset));\n    var scrollSpeed = Math.round(Math.abs(velocity) * 1000); // px / sec\n    // Whether blank now or not, record the elapsed time blank if we were blank last time.\n\n    var now = performanceNow();\n\n    if (this._anyBlankStartTime != null) {\n      this._info.any_blank_ms += now - this._anyBlankStartTime;\n    }\n\n    this._anyBlankStartTime = null;\n\n    if (this._mostlyBlankStartTime != null) {\n      this._info.mostly_blank_ms += now - this._mostlyBlankStartTime;\n    }\n\n    this._mostlyBlankStartTime = null;\n    var blankTop = 0;\n    var first = state.first;\n\n    var firstFrame = this._getFrameMetrics(first);\n\n    while (first <= state.last && (!firstFrame || !firstFrame.inLayout)) {\n      firstFrame = this._getFrameMetrics(first);\n      first++;\n    } // Only count blankTop if we aren't rendering the first item, otherwise we will count the header\n    // as blank.\n\n\n    if (firstFrame && first > 0) {\n      blankTop = Math.min(visibleLength, Math.max(0, firstFrame.offset - offset));\n    }\n\n    var blankBottom = 0;\n    var last = state.last;\n\n    var lastFrame = this._getFrameMetrics(last);\n\n    while (last >= state.first && (!lastFrame || !lastFrame.inLayout)) {\n      lastFrame = this._getFrameMetrics(last);\n      last--;\n    } // Only count blankBottom if we aren't rendering the last item, otherwise we will count the\n    // footer as blank.\n\n\n    if (lastFrame && last < props.getItemCount(props.data) - 1) {\n      var bottomEdge = lastFrame.offset + lastFrame.length;\n      blankBottom = Math.min(visibleLength, Math.max(0, offset + visibleLength - bottomEdge));\n    }\n\n    var pixels_blank = Math.round(blankTop + blankBottom);\n    var blankness = pixels_blank / visibleLength;\n\n    if (blankness > 0) {\n      this._anyBlankStartTime = now;\n      this._info.any_blank_speed_sum += scrollSpeed;\n      this._info.any_blank_count++;\n      this._info.pixels_blank += pixels_blank;\n\n      if (blankness > 0.5) {\n        this._mostlyBlankStartTime = now;\n        this._info.mostly_blank_count++;\n      }\n    } else if (scrollSpeed < 0.01 || Math.abs(dOffset) < 1) {\n      this.deactivateAndFlush();\n    }\n\n    return blankness;\n  };\n\n  _proto.enabled = function enabled() {\n    return this._enabled;\n  };\n\n  _proto._resetData = function _resetData() {\n    this._anyBlankStartTime = null;\n    this._info = new Info();\n    this._mostlyBlankStartTime = null;\n    this._samplesStartTime = null;\n  };\n\n  return FillRateHelper;\n}();\n\nexport default FillRateHelper;"]},"metadata":{},"sourceType":"script"}