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      1 // Copyright 2014 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_SYSTEM_WEB_NOTIFICATION_ASH_POPUP_ALIGNMENT_DELEGATE_H_
      6 #define ASH_SYSTEM_WEB_NOTIFICATION_ASH_POPUP_ALIGNMENT_DELEGATE_H_
      7 
      8 #include "ash/ash_export.h"
      9 #include "ash/shelf/shelf_layout_manager_observer.h"
     10 #include "ash/shelf/shelf_types.h"
     11 #include "ash/shell_observer.h"
     12 #include "base/macros.h"
     13 #include "ui/gfx/display_observer.h"
     14 #include "ui/gfx/geometry/rect.h"
     15 #include "ui/message_center/views/popup_alignment_delegate.h"
     16 
     17 namespace aura {
     18 class Window;
     19 }
     20 
     21 namespace gfx {
     22 class Screen;
     23 }
     24 
     25 namespace ash {
     26 
     27 class AshPopupAlignmentDelegateTest;
     28 class ShelfLayoutManager;
     29 class WebNotificationTrayTest;
     30 
     31 // The PopupAlignmentDelegate subclass for Ash. It needs to handle alignment of
     32 // the shelf and its autohide state.
     33 class ASH_EXPORT AshPopupAlignmentDelegate
     34     : public message_center::PopupAlignmentDelegate,
     35       public ShelfLayoutManagerObserver,
     36       public ShellObserver,
     37       public gfx::DisplayObserver {
     38  public:
     39   AshPopupAlignmentDelegate();
     40   virtual ~AshPopupAlignmentDelegate();
     41 
     42   // Start observing the system.
     43   void StartObserving(gfx::Screen* screen, const gfx::Display& display);
     44 
     45   // Sets the current height of the system tray so that the notification toasts
     46   // can avoid it.
     47   void SetSystemTrayHeight(int height);
     48 
     49   // Overridden from message_center::PopupAlignmentDelegate:
     50   virtual int GetToastOriginX(const gfx::Rect& toast_bounds) const OVERRIDE;
     51   virtual int GetBaseLine() const OVERRIDE;
     52   virtual int GetWorkAreaBottom() const OVERRIDE;
     53   virtual bool IsTopDown() const OVERRIDE;
     54   virtual bool IsFromLeft() const OVERRIDE;
     55   virtual void RecomputeAlignment(const gfx::Display& display) OVERRIDE;
     56 
     57  private:
     58   friend class AshPopupAlignmentDelegateTest;
     59   friend class WebNotificationTrayTest;
     60 
     61   // Get the current alignment of the shelf.
     62   ShelfAlignment GetAlignment() const;
     63 
     64   // Update |shelf_| and start watching when it's first set. This should not
     65   // be done in the constructor because the shelf might not be initialized at
     66   // that point.
     67   void UpdateShelf();
     68 
     69   // Overridden from ShellObserver:
     70   virtual void OnDisplayWorkAreaInsetsChanged() OVERRIDE;
     71 
     72   // Overridden from ShelfLayoutManagerObserver:
     73   virtual void OnAutoHideStateChanged(ShelfAutoHideState new_state) OVERRIDE;
     74 
     75   // Overridden from gfx::DisplayObserver:
     76   virtual void OnDisplayAdded(const gfx::Display& new_display) OVERRIDE;
     77   virtual void OnDisplayRemoved(const gfx::Display& old_display) OVERRIDE;
     78   virtual void OnDisplayMetricsChanged(const gfx::Display& display,
     79                                        uint32_t metrics) OVERRIDE;
     80 
     81   int64_t display_id_;
     82   gfx::Screen* screen_;
     83   gfx::Rect work_area_;
     84   aura::Window* root_window_;
     85   ShelfLayoutManager* shelf_;
     86   int system_tray_height_;
     87 
     88   DISALLOW_COPY_AND_ASSIGN(AshPopupAlignmentDelegate);
     89 };
     90 
     91 }  // namespace ash
     92 
     93 #endif  // ASH_SYSTEM_WEB_NOTIFICATION_ASH_POPUP_ALIGNMENT_DELEGATE_H_
     94