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      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 a 3-finger swipe down gesture from the top of the screen to
     22 // enter overview mode.
     23 class OverviewGestureHandler {
     24  public:
     25   OverviewGestureHandler();
     26   virtual ~OverviewGestureHandler();
     27 
     28   // Processes a scroll event and may start overview. Returns true if the event
     29   // has been handled and should not be processed further, false otherwise.
     30   bool ProcessScrollEvent(const ui::ScrollEvent& event);
     31 
     32   // Processes a gesture event and may start overview. Returns true if the event
     33   // has been handled and should not be processed any farther, false otherwise.
     34   bool ProcessGestureEvent(const ui::GestureEvent& event);
     35 
     36  private:
     37   // True if the current/last gesture began in the top bezel.
     38   bool in_top_bezel_gesture_;
     39 
     40   // The total distance scrolled with three fingers.
     41   float scroll_x_;
     42   float scroll_y_;
     43 
     44   DISALLOW_COPY_AND_ASSIGN(OverviewGestureHandler);
     45 };
     46 
     47 }  // namespace ash
     48 
     49 #endif  // ASH_WM_GESTURES_OVERVIEW_GESTURE_HANDLER_H_
     50