ash/system/web_notification/ash_popup_alignment_delegate.h

   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   ~AshPopupAlignmentDelegate() override;
  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   int GetToastOriginX(const gfx::Rect& toast_bounds) const override;
  51   int GetBaseLine() const override;
  52   int GetWorkAreaBottom() const override;
  53   bool IsTopDown() const override;
  54   bool IsFromLeft() const override;
  55   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   // Utility function to get the display which should be care about.
  70   gfx::Display GetCurrentDisplay() const;
  71
  72   // Compute the new work area.
  73   void UpdateWorkArea(const gfx::Display& display,
  74                       ShelfAutoHideState new_state);
  75
  76   // Overridden from ShellObserver:
  77   void OnDisplayWorkAreaInsetsChanged() override;
  78
  79   // Overridden from ShelfLayoutManagerObserver:
  80   void OnAutoHideStateChanged(ShelfAutoHideState new_state) override;
  81
  82   // Overridden from gfx::DisplayObserver:
  83   void OnDisplayAdded(const gfx::Display& new_display) override;
  84   void OnDisplayRemoved(const gfx::Display& old_display) override;
  85   void OnDisplayMetricsChanged(const gfx::Display& display,
  86                                uint32_t metrics) override;
  87
  88   gfx::Screen* screen_;
  89   gfx::Rect work_area_;
  90   aura::Window* root_window_;
  91   ShelfLayoutManager* shelf_;
  92   int system_tray_height_;
  93
  94   DISALLOW_COPY_AND_ASSIGN(AshPopupAlignmentDelegate);
  95 };
  96
  97 }  // namespace ash
  98
  99 #endif  // ASH_SYSTEM_WEB_NOTIFICATION_ASH_POPUP_ALIGNMENT_DELEGATE_H_