ash/wm/gestures/two_finger_drag_handler.h

   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_