ash/keyboard_uma_event_filter.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 ASH_KEYBOARD_UMA_EVENT_FILTER_H_
   6 #define ASH_KEYBOARD_UMA_EVENT_FILTER_H_
   7
   8 #include "base/compiler_specific.h"
   9 #include "base/time/time.h"
  10 #include "ui/events/event_handler.h"
  11
  12 namespace ash {
  13 namespace internal {
  14
  15 // EventFilter for tracking keyboard-related metrics, which intercepts events
  16 // before they are processed by the usual path and logs metrics about the
  17 // events.
  18 class KeyboardUMAEventFilter : public ui::EventHandler {
  19  public:
  20   KeyboardUMAEventFilter();
  21   virtual ~KeyboardUMAEventFilter();
  22
  23   // ui::EventHandler overrides:
  24   virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
  25
  26  private:
  27   // The timestamp of the last character keystroke.
  28   base::TimeDelta last_keystroke_time_;
  29
  30   DISALLOW_COPY_AND_ASSIGN(KeyboardUMAEventFilter);
  31 };
  32
  33 }  // namespace internal
  34 }  // namespace ash
  35
  36 #endif  // ASH_KEYBOARD_UMA_EVENT_FILTER_H_