ash/wm/gestures/overview_gesture_handler.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_WM_GESTURES_OVERVIEW_GESTURE_HANDLER_H_
   6 #define ASH_WM_GESTURES_OVERVIEW_GESTURE_HANDLER_H_
   7
   8 #include "base/basictypes.h"
   9
  10 namespace aura {
  11 class Window;
  12 }
  13
  14 namespace ui {
  15 class GestureEvent;
  16 class ScrollEvent;
  17 }
  18
  19 namespace ash {
  20
  21 // This handles 3-finger touchpad scroll events to enter/exit overview mode.
  22 class OverviewGestureHandler {
  23  public:
  24   OverviewGestureHandler();
  25   virtual ~OverviewGestureHandler();
  26
  27   // Processes a scroll event and may start overview. Returns true if the event
  28   // has been handled and should not be processed further, false otherwise.
  29   bool ProcessScrollEvent(const ui::ScrollEvent& event);
  30
  31  private:
  32   // The total distance scrolled with three fingers.
  33   float scroll_x_;
  34   float scroll_y_;
  35
  36   DISALLOW_COPY_AND_ASSIGN(OverviewGestureHandler);
  37 };
  38
  39 }  // namespace ash
  40
  41 #endif  // ASH_WM_GESTURES_OVERVIEW_GESTURE_HANDLER_H_