ash/wm/gestures/tray_gesture_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_TRAY_GESTURE_HANDLER_H_
   6 #define ASH_WM_GESTURES_TRAY_GESTURE_HANDLER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "ui/views/widget/widget_observer.h"
  11
  12 namespace ui {
  13 class GestureEvent;
  14 }
  15
  16 namespace ash {
  17 namespace internal {
  18
  19 // Handles gesture events on the shelf to show the system tray bubble.
  20 class TrayGestureHandler : public views::WidgetObserver {
  21  public:
  22   TrayGestureHandler();
  23   virtual ~TrayGestureHandler();
  24
  25   // Handles a gesture-update event and updates the dragging state of the tray
  26   // bubble. Returns true if the handler can continue to process gesture events
  27   // for the bubble. Returns false if it should no longer receive gesture
  28   // events.
  29   bool UpdateGestureDrag(const ui::GestureEvent& event);
  30
  31   void CompleteGestureDrag(const ui::GestureEvent& event);
  32
  33  private:
  34   virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
  35
  36   // The widget for the tray-bubble.
  37   views::Widget* widget_;
  38
  39   // The amount that has been dragged.
  40   float gesture_drag_amount_;
  41
  42   DISALLOW_COPY_AND_ASSIGN(TrayGestureHandler);
  43 };
  44
  45 }  // namespace internal
  46 }  // namespace ash
  47
  48 #endif  // ASH_WM_GESTURES_TRAY_GESTURE_HANDLER_H_