src/chrome/browser/chromeos/device_uma.cc

   1 // Copyright 2013 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 "chrome/browser/chromeos/device_uma.h"
   6
   7 #include <X11/extensions/XInput.h>
   8 #include <X11/extensions/XInput2.h>
   9
  10 #include "base/logging.h"
  11 #include "base/memory/singleton.h"
  12 #include "base/metrics/histogram.h"
  13 #include "ui/events/devices/x11/device_data_manager_x11.h"
  14 #include "ui/events/event_constants.h"
  15 #include "ui/events/event_utils.h"
  16 #include "ui/events/platform/platform_event_source.h"
  17
  18 // Enum type for CrOS gesture lib UMA
  19 enum UMACrosGestureMetricsType{
  20   // To give an estimated number of all interested events.
  21   UMA_CROS_GESTURE_METRICS_ALL_EVENTS,
  22   UMA_CROS_GESTURE_METRICS_NOISY_GROUND,
  23   // NOTE: Add states only immediately above this line. Make sure to
  24   // update the enum list in tools/metrics/histograms/histograms.xml
  25   // accordingly.
  26   UMA_CROS_GESTURE_METRICS_COUNT
  27 };
  28
  29 namespace chromeos {
  30
  31 DeviceUMA* DeviceUMA::GetInstance() {
  32   return Singleton<DeviceUMA>::get();
  33 }
  34
  35 DeviceUMA::DeviceUMA()
  36     : stopped_(false) {
  37   ui::PlatformEventSource::GetInstance()->AddPlatformEventObserver(this);
  38 }
  39
  40 DeviceUMA::~DeviceUMA() {
  41   Stop();
  42 }
  43
  44 void DeviceUMA::Stop() {
  45   if (stopped_)
  46     return;
  47   ui::PlatformEventSource::GetInstance()->RemovePlatformEventObserver(this);
  48   stopped_ = true;
  49 }
  50
  51 void DeviceUMA::WillProcessEvent(const ui::PlatformEvent& event) {
  52   CheckIncomingEvent(event);
  53 }
  54
  55 void DeviceUMA::DidProcessEvent(const ui::PlatformEvent& event) {
  56 }
  57
  58 void DeviceUMA::CheckTouchpadEvent(XEvent* native_event) {
  59   XIDeviceEvent* xiev =
  60       static_cast<XIDeviceEvent*>(native_event->xcookie.data);
  61   // We take only the slave event since there is no need to count twice.
  62   if (xiev->deviceid != xiev->sourceid)
  63     return;
  64   UMA_HISTOGRAM_ENUMERATION("Touchpad.Metrics",
  65                             UMA_CROS_GESTURE_METRICS_ALL_EVENTS,
  66                             UMA_CROS_GESTURE_METRICS_COUNT);
  67
  68   // Check for the CrOS touchpad metrics gesture
  69   ui::DeviceDataManagerX11 *manager = ui::DeviceDataManagerX11::GetInstance();
  70   if (manager->IsCMTMetricsEvent(native_event)) {
  71     ui::GestureMetricsType type;
  72     float data1, data2;
  73     manager->GetMetricsData(native_event, &type, &data1, &data2);
  74
  75     // We currently track only the noisy ground issue. Please see
  76     // http://crbug.com/237683.
  77     if (type == ui::kGestureMetricsTypeNoisyGround) {
  78       UMA_HISTOGRAM_ENUMERATION("Touchpad.Metrics",
  79                                 UMA_CROS_GESTURE_METRICS_NOISY_GROUND,
  80                                 UMA_CROS_GESTURE_METRICS_COUNT);
  81     }
  82   }
  83 }
  84
  85 void DeviceUMA::CheckIncomingEvent(XEvent* event) {
  86   switch (event->type) {
  87     case GenericEvent: {
  88       ui::DeviceDataManagerX11* devices =
  89           ui::DeviceDataManagerX11::GetInstance();
  90       if (devices->IsXIDeviceEvent(event) &&
  91           devices->IsTouchpadXInputEvent(event)) {
  92         CheckTouchpadEvent(event);
  93       }
  94       break;
  95     }
  96     default:
  97       break;
  98   }
  99   return;
 100 }
 101
 102 }  // namespace chromeos