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      1 // Copyright (c) 2012 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_TWO_FINGER_DRAG_HANDLER_H_
      6 #define ASH_WM_GESTURES_TWO_FINGER_DRAG_HANDLER_H_
      7 
      8 #include "base/basictypes.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "ui/aura/window_observer.h"
     11 
     12 namespace aura {
     13 class Window;
     14 }
     15 
     16 namespace ui {
     17 class GestureEvent;
     18 }
     19 
     20 namespace ash {
     21 
     22 class WindowResizer;
     23 
     24 namespace internal {
     25 
     26 // This handles 2-finger drag gestures to move toplevel windows.
     27 class TwoFingerDragHandler : public aura::WindowObserver {
     28  public:
     29   TwoFingerDragHandler();
     30   virtual ~TwoFingerDragHandler();
     31 
     32   // Processes a gesture event and starts a drag, or updates/ends an in-progress
     33   // drag. Returns true if the event has been handled and should not be
     34   // processed any farther, false otherwise.
     35   bool ProcessGestureEvent(aura::Window* target, const ui::GestureEvent& event);
     36 
     37  private:
     38   void Reset();
     39 
     40   // Overridden from aura::WindowObserver.
     41   virtual void OnWindowVisibilityChanged(aura::Window* window,
     42                                          bool visible) OVERRIDE;
     43   virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
     44 
     45   int first_finger_hittest_;
     46 
     47   scoped_ptr<WindowResizer> window_resizer_;
     48 
     49   DISALLOW_COPY_AND_ASSIGN(TwoFingerDragHandler);
     50 };
     51 
     52 }
     53 }  // namespace ash
     54 
     55 #endif  // ASH_WM_GESTURES_TWO_FINGER_DRAG_HANDLER_H_
     56