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_ 54
