Polish launcher tooltip visibility (2nd try).

ash/launcher/launcher_tooltip_manager.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_LAUNCHER_LAUNCHER_TOOLTIP_MANAGER_H_
 #define ASH_LAUNCHER_LAUNCHER_TOOLTIP_MANAGER_H_
 #pragma once
 
 #include "ash/ash_export.h"
+#include "ash/wm/shelf_layout_manager.h"
 #include "ash/wm/shelf_types.h"
 #include "base/basictypes.h"
 #include "base/string16.h"
 #include "ui/gfx/rect.h"
 #include "ui/views/bubble/bubble_border.h"
 #include "ui/views/bubble/bubble_delegate.h"
 
 namespace base {
 class Timer;
 }
 
 namespace views {
 class BubbleDelegateView;
 class Label;
 }
 
 namespace ash {
 namespace test {
+class LauncherTooltipManagerTest;
 class LauncherViewTest;
 }
 
 namespace internal {
 
 // LauncherTooltipManager manages the tooltip balloon poping up on launcher
 // items.
-class ASH_EXPORT LauncherTooltipManager {
+class ASH_EXPORT LauncherTooltipManager : public ShelfLayoutManager::Observer {
  public:
-  LauncherTooltipManager(ShelfAlignment alignment);
-  ~LauncherTooltipManager();
+  LauncherTooltipManager(ShelfAlignment alignment,
+                         ShelfLayoutManager* shelf_layout_manager);
+  virtual ~LauncherTooltipManager();
 
   // Called when the bubble is closed.
   void OnBubbleClosed(views::BubbleDelegateView* view);
 
   // Shows the tooltip after a delay.  It also has the appearing animation.
   void ShowDelayed(views::View* anchor, const string16& text);
 
   // Shows the tooltip immediately.  It omits the appearing animation.
   void ShowImmediately(views::View* anchor, const string16& text);
 
   // Closes the tooltip.
   void Close();
 
   // Changes the arrow location of the tooltip in case that the launcher
   // arrangement has changed.
   void SetArrowLocation(ShelfAlignment alignment);
 
   // Resets the timer for the delayed showing |view_|.  If the timer isn't
   // running, it starts a new timer.
   void ResetTimer();
 
   // Stops the timer for the delayed showing |view_|.
   void StopTimer();
 
   // Returns true if the tooltip is currently visible.
   bool IsVisible();
 
+protected:
+  // ShelfLayoutManager::Observer overrides:
+  virtual void WillDeleteShelf() OVERRIDE;
+  virtual void WillChangeVisibilityState(
+      ShelfLayoutManager::VisibilityState new_state) OVERRIDE;
+  virtual void OnAutoHideStateChanged(
+      ShelfLayoutManager::AutoHideState new_state) OVERRIDE;
+
  private:
   class LauncherTooltipBubble;
   friend class test::LauncherViewTest;
+  friend class test::LauncherTooltipManagerTest;
 
   void ShowInternal();
   void CreateBubble(views::View* anchor, const string16& text);
 
   LauncherTooltipBubble* view_;
   views::View* anchor_;
   string16 text_;
   ShelfAlignment alignment_;
   scoped_ptr<base::Timer> timer_;
 
+  ShelfLayoutManager* shelf_layout_manager_;
+
   DISALLOW_COPY_AND_ASSIGN(LauncherTooltipManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_LAUNCHER_LAUNCHER_TOOLTIP_MANAGER_H_