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

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/events/ozone/evdev/touch_noise/touch_noise_finder.h"
   6
   7 #include "base/metrics/histogram_macros.h"
   8 #include "base/stl_util.h"
   9 #include "ui/events/event_utils.h"
  10 #include "ui/events/ozone/evdev/touch_noise/far_apart_taps_touch_noise_filter.h"
  11 #include "ui/events/ozone/evdev/touch_noise/horizontally_aligned_touch_noise_filter.h"
  12 #include "ui/events/ozone/evdev/touch_noise/single_position_touch_noise_filter.h"
  13 #include "ui/events/ozone/evdev/touch_noise/touch_noise_filter.h"
  14
  15 namespace ui {
  16
  17 TouchNoiseFinder::TouchNoiseFinder() : last_noise_time_(ui::EventTimeForNow()) {
  18   filters_.push_back(new FarApartTapsTouchNoiseFilter);
  19   filters_.push_back(new HorizontallyAlignedTouchNoiseFilter);
  20   filters_.push_back(new SinglePositionTouchNoiseFilter);
  21 }
  22
  23 TouchNoiseFinder::~TouchNoiseFinder() {
  24   STLDeleteElements(&filters_);
  25 }
  26
  27 void TouchNoiseFinder::HandleTouches(
  28     const std::vector<InProgressTouchEvdev>& touches,
  29     base::TimeDelta time) {
  30   for (const InProgressTouchEvdev& touch : touches) {
  31     if (!touch.was_touching)
  32       slots_with_noise_.set(touch.slot, false);
  33   }
  34
  35   bool had_noise = slots_with_noise_.any();
  36
  37   for (TouchNoiseFilter* filter : filters_)
  38     filter->Filter(touches, time, &slots_with_noise_);
  39
  40   RecordUMA(had_noise, time);
  41 }
  42
  43 bool TouchNoiseFinder::SlotHasNoise(size_t slot) const {
  44   return slots_with_noise_.test(slot);
  45 }
  46
  47 void TouchNoiseFinder::RecordUMA(bool had_noise, base::TimeDelta time) {
  48   if (slots_with_noise_.any()) {
  49     if (!had_noise) {
  50       UMA_HISTOGRAM_LONG_TIMES(
  51           "Ozone.TouchNoiseFilter.TimeSinceLastNoiseOccurrence",
  52           time - last_noise_time_);
  53     }
  54
  55     last_noise_time_ = time;
  56   }
  57 }
  58
  59 }  // namespace ui