Allow Uber Tray popup pointing to the related tray item view.

ash/system/tray/system_tray.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_
 #define ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_
 #pragma once
 
 #include "ash/launcher/background_animator.h"
 #include "ash/ash_export.h"
 #include "ash/system/tray/tray_views.h"
 #include "ash/system/user/login_status.h"
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "ui/views/view.h"
 
+#include <map>
 #include <vector>
 
 namespace ash {
 
 class AccessibilityObserver;
 class AudioObserver;
 class BluetoothObserver;
 class BrightnessObserver;
 class CapsLockObserver;
 class ClockObserver;
@@ skipping 118 matching lines @@
   friend class internal::SystemTrayLayerAnimationObserver;
   friend class internal::SystemTrayBubble;
 
   // Called when the widget associated with |bubble| closes. |bubble| should
   // always == |bubble_|. This triggers destroying |bubble_| and hiding the
   // launcher if necessary.
   void RemoveBubble(internal::SystemTrayBubble* bubble);
 
   const ScopedVector<SystemTrayItem>& items() const { return items_; }
 
+  // Calculates the x-offset for the item in the tray. Returns -1 if its tray
+  // item view is not visible.
+  int GetTrayXOffset(SystemTrayItem* item) const;
+
+  // Shows the default view and its arrow position is shifted by |x_offset|.
+  void ShowDefaultViewWithOffset(BubbleCreationType creation_type,
+                                 int x_offset);
+
   // Constructs or re-constructs |bubble_| and populates it with |items|.
   void ShowItems(const std::vector<SystemTrayItem*>& items,
                  bool details,
                  bool activate,
-                 BubbleCreationType creation_type);
+                 BubbleCreationType creation_type,
+                 int x_offset);
 
   // Constructs or re-constructs |notification_bubble_| and populates it with
   // |notification_items_|, or destroys it if there are no notification items.
   void UpdateNotificationBubble();
 
   // Called when the anchor (tray or bubble) may have moved or changed.
   void UpdateNotificationAnchor();
 
   // Overridden from internal::ActionableView.
   virtual bool PerformAction(const views::Event& event) OVERRIDE;
 
   // Overridden from views::View.
   virtual void OnMouseEntered(const views::MouseEvent& event) OVERRIDE;
   virtual void OnMouseExited(const views::MouseEvent& event) OVERRIDE;
   virtual void AboutToRequestFocusFromTabTraversal(bool reverse) OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
   virtual void OnPaintFocusBorder(gfx::Canvas* canvas) OVERRIDE;
 
   // Overridden from internal::BackgroundAnimatorDelegate.
   virtual void UpdateBackground(int alpha) OVERRIDE;
 
   ScopedVector<SystemTrayItem> items_;
 
   std::vector<SystemTrayItem*> notification_items_;
 
   // The container for all the tray views of the items.
   views::View* tray_container_;
 
+  // Mappings of system tray item and it's view in the tray.
+  std::map<SystemTrayItem*, views::View*> tray_item_map_;
+
   // These observers are not owned by the tray.
   AccessibilityObserver* accessibility_observer_;
   AudioObserver* audio_observer_;
   BluetoothObserver* bluetooth_observer_;
   BrightnessObserver* brightness_observer_;
   CapsLockObserver* caps_lock_observer_;
   ClockObserver* clock_observer_;
   DriveObserver* drive_observer_;
   IMEObserver* ime_observer_;
   NetworkObserver* network_observer_;
@@ skipping 20 matching lines @@
   internal::BackgroundAnimator hover_background_animator_;
   scoped_ptr<internal::SystemTrayLayerAnimationObserver>
       layer_animation_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(SystemTray);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SYSTEM_TRAY_SYSTEM_TRAY_H_