chrome/browser/chromeos/device_uma.h

   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 #ifndef CHROME_BROWSER_CHROMEOS_DEVICE_UMA_H_
   6 #define CHROME_BROWSER_CHROMEOS_DEVICE_UMA_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/event_types.h"
  10 #include "base/message_loop/message_loop.h"
  11
  12 template <typename T> struct DefaultSingletonTraits;
  13
  14 namespace chromeos {
  15
  16 // A class to record devices' input event details via the UMA system
  17 class DeviceUMA : public base::MessageLoopForUI::Observer {
  18  public:
  19   // Getting instance starts the class automatically if it hasn't been
  20   // started before.
  21   static DeviceUMA* GetInstance();
  22
  23   void Stop();
  24
  25  private:
  26   friend struct DefaultSingletonTraits<DeviceUMA>;
  27
  28   DeviceUMA();
  29   virtual ~DeviceUMA();
  30
  31   // Start and stop observing events.
  32   void AddMessageLoopObserver();
  33   void RemoveMessageLoopObserver();
  34
  35   // MessageLoopForUI::Observer overrides.
  36   virtual base::EventStatus WillProcessEvent(
  37       const base::NativeEvent& event) OVERRIDE;
  38   virtual void DidProcessEvent(const base::NativeEvent& event) OVERRIDE;
  39
  40   // Check CrOS touchpad events to see if the metrics gesture is present
  41   void CheckTouchpadEvent(const base::NativeEvent& event);
  42
  43   // Check the incoming events for interesting patterns that we care about.
  44   void CheckIncomingEvent(const base::NativeEvent& event);
  45
  46   bool is_observing_;
  47
  48   DISALLOW_COPY_AND_ASSIGN(DeviceUMA);
  49 };
  50
  51 }  // namespace chromeos
  52
  53 #endif  // CHROME_BROWSER_CHROMEOS_DEVICE_UMA_H_