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 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_