Avoid unnecessary visibility changes to BookmarkBarView

chrome/browser/ui/views/bookmarks/bookmark_bar_view.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 CHROME_BROWSER_UI_VIEWS_BOOKMARKS_BOOKMARK_BAR_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_BOOKMARKS_BOOKMARK_BAR_VIEW_H_
 
 #include <set>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "chrome/browser/bookmarks/bookmark_stats.h"
 #include "chrome/browser/ui/bookmarks/bookmark_bar.h"
 #include "chrome/browser/ui/bookmarks/bookmark_bar_instructions_delegate.h"
 #include "chrome/browser/ui/views/bookmarks/bookmark_bubble_view_observer.h"
 #include "chrome/browser/ui/views/bookmarks/bookmark_menu_controller_observer.h"
 #include "chrome/browser/ui/views/detachable_toolbar_view.h"
 #include "components/bookmarks/browser/bookmark_model_observer.h"
 #include "components/bookmarks/browser/bookmark_node_data.h"
 #include "ui/gfx/animation/animation_delegate.h"
 #include "ui/views/context_menu_controller.h"
 #include "ui/views/controls/button/button.h"
 #include "ui/views/controls/button/menu_button_listener.h"
 #include "ui/views/controls/menu/menu_types.h"
 #include "ui/views/drag_controller.h"
 
+class BookmarkBarViewObserver;
 class BookmarkContextMenu;
 class BookmarkModel;
 class Browser;
 class BrowserView;
 class ChromeBookmarkClient;
 class Profile;
 
 namespace content {
 class PageNavigator;
 }
@@ skipping 42 matching lines @@
 
   // |browser_view| can be NULL during tests.
   BookmarkBarView(Browser* browser, BrowserView* browser_view);
   virtual ~BookmarkBarView();
 
   static void DisableAnimationsForTesting(bool disabled);
 
   // Returns the current browser.
   Browser* browser() const { return browser_; }
 
+  void AddObserver(BookmarkBarViewObserver* observer);
+  void RemoveObserver(BookmarkBarViewObserver* observer);
+
   // Sets the PageNavigator that is used when the user selects an entry on
   // the bookmark bar.
   void SetPageNavigator(content::PageNavigator* navigator);
 
   // Sets whether the containing browser is showing an infobar.  This affects
   // layout during animation.
   void set_infobar_visible(bool infobar_visible) {
     infobar_visible_ = infobar_visible;
   }
 
@@ skipping 75 matching lines @@
       int* formats,
       std::set<ui::OSExchangeData::CustomFormat>* custom_formats) OVERRIDE;
   virtual bool AreDropTypesRequired() OVERRIDE;
   virtual bool CanDrop(const ui::OSExchangeData& data) OVERRIDE;
   virtual void OnDragEntered(const ui::DropTargetEvent& event) OVERRIDE;
   virtual int OnDragUpdated(const ui::DropTargetEvent& event) OVERRIDE;
   virtual void OnDragExited() OVERRIDE;
   virtual int OnPerformDrop(const ui::DropTargetEvent& event) OVERRIDE;
   virtual void OnThemeChanged() OVERRIDE;
   virtual const char* GetClassName() const OVERRIDE;
+  virtual void SetVisible(bool visible) OVERRIDE;
 
   // AccessiblePaneView:
   virtual void GetAccessibleState(ui::AXViewState* state) OVERRIDE;
 
   // gfx::AnimationDelegate:
   virtual void AnimationProgressed(const gfx::Animation* animation) OVERRIDE;
   virtual void AnimationEnded(const gfx::Animation* animation) OVERRIDE;
 
   // BookmarkMenuControllerObserver:
   virtual void BookmarkMenuControllerDeleted(
@@ skipping 210 matching lines @@
 
   // Shows the other bookmark entries.
   views::MenuButton* other_bookmarked_button_;
 
   // Shows the managed bookmarks entries.
   views::MenuButton* managed_bookmarks_button_;
 
   // Shows the Apps page shortcut.
   views::LabelButton* apps_page_shortcut_;
 
-  // Task used to delay showing of the drop menu.
-  base::WeakPtrFactory<BookmarkBarView> show_folder_method_factory_;
-
   // Used to track drops on the bookmark bar view.
   scoped_ptr<DropInfo> drop_info_;
 
   // Visible if not all the bookmark buttons fit.
   views::MenuButton* overflow_button_;
 
   // Shows a text and a link to import bookmarks if there are no bookmarks in
   // the Bookmarks Bar.
   views::View* instructions_;
 
@@ skipping 11 matching lines @@
   // If the bookmark bubble is showing, this is the visible ancestor of the URL.
   // The visible ancestor is either the other_bookmarked_button_,
   // overflow_button_ or a button on the bar.
   views::CustomButton* throbbing_view_;
 
   BookmarkBar::State bookmark_bar_state_;
 
   // Are we animating to or from the detached state?
   bool animating_detached_;
 
+  ObserverList<BookmarkBarViewObserver> observers_;
+
+  // Factory used to delay showing of the drop menu.
+  base::WeakPtrFactory<BookmarkBarView> show_folder_method_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(BookmarkBarView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_BOOKMARKS_BOOKMARK_BAR_VIEW_H_