ui/events/ozone/evdev/touch_noise/touch_noise_finder.cc

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/events/ozone/evdev/touch_noise/touch_noise_finder.h"

#include "base/metrics/histogram_macros.h"
#include "base/stl_util.h"
#include "ui/events/event_utils.h"
#include "ui/events/ozone/evdev/touch_noise/far_apart_taps_touch_noise_filter.h"
#include "ui/events/ozone/evdev/touch_noise/horizontally_aligned_touch_noise_filter.h"
#include "ui/events/ozone/evdev/touch_noise/single_position_touch_noise_filter.h"
#include "ui/events/ozone/evdev/touch_noise/touch_noise_filter.h"

namespace ui {

TouchNoiseFinder::TouchNoiseFinder() : last_noise_time_(ui::EventTimeForNow()) {
  filters_.push_back(new FarApartTapsTouchNoiseFilter);
  filters_.push_back(new HorizontallyAlignedTouchNoiseFilter);
  filters_.push_back(new SinglePositionTouchNoiseFilter);
}

TouchNoiseFinder::~TouchNoiseFinder() {
  STLDeleteElements(&filters_);
}

void TouchNoiseFinder::HandleTouches(
    const std::vector<InProgressTouchEvdev>& touches,
    base::TimeDelta time) {
  for (const InProgressTouchEvdev& touch : touches) {
    if (!touch.was_touching)
      slots_with_noise_.set(touch.slot, false);
  }

  bool had_noise = slots_with_noise_.any();

  for (TouchNoiseFilter* filter : filters_)
    filter->Filter(touches, time, &slots_with_noise_);

  RecordUMA(had_noise, time);
}

bool TouchNoiseFinder::SlotHasNoise(size_t slot) const {
  return slots_with_noise_.test(slot);
}

void TouchNoiseFinder::RecordUMA(bool had_noise, base::TimeDelta time) {
  if (slots_with_noise_.any()) {
    if (!had_noise) {
      UMA_HISTOGRAM_LONG_TIMES(
          "Ozone.TouchNoiseFilter.TimeSinceLastNoiseOccurrence",
          time - last_noise_time_);
    }

    last_noise_time_ = time;
  }
}

}  // namespace ui