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
  18 // Handles gesture events on the shelf to show the system tray bubble.
  19 class TrayGestureHandler : public views::WidgetObserver {
  20  public:
  21   TrayGestureHandler();
  22   virtual ~TrayGestureHandler();
  23
  24   // Handles a gesture-update event and updates the dragging state of the tray
  25   // bubble. Returns true if the handler can continue to process gesture events
  26   // for the bubble. Returns false if it should no longer receive gesture
  27   // events.
  28   bool UpdateGestureDrag(const ui::GestureEvent& event);
  29
  30   void CompleteGestureDrag(const ui::GestureEvent& event);
  31
  32  private:
  33   virtual void OnWidgetDestroying(views::Widget* widget) override;
  34
  35   // The widget for the tray-bubble.
  36   views::Widget* widget_;
  37
  38   // The amount that has been dragged.
  39   float gesture_drag_amount_;
  40
  41   DISALLOW_COPY_AND_ASSIGN(TrayGestureHandler);
  42 };
  43
  44 }  // namespace ash
  45
  46 #endif  // ASH_WM_GESTURES_TRAY_GESTURE_HANDLER_H_