Reposition toasts to align the closed one.

ui/message_center/views/message_popup_collection.h

 // Copyright (c) 2013 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 UI_MESSAGE_CENTER_VIEWS_MESSAGE_POPUP_COLLECTION_H_
 #define UI_MESSAGE_CENTER_VIEWS_MESSAGE_POPUP_COLLECTION_H_
 
 #include <list>
 #include <map>
 
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/gfx/native_widget_types.h"
+#include "ui/gfx/rect.h"
 #include "ui/message_center/message_center_export.h"
+#include "ui/message_center/message_center_observer.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace views {
 class Widget;
 }
 
 namespace ash {
 FORWARD_DECLARE_TEST(WebNotificationTrayTest, ManyPopupNotifications);
 }
 
 namespace message_center {
+namespace test {
+class MessagePopupCollectionTest;
+}
 
 class MessageCenter;
 class ToastContentsView;
 
 // Container for popup toasts. Because each toast is a frameless window rather
 // than a view in a bubble, now the container just manages all of those windows.
 // This is similar to chrome/browser/notifications/balloon_collection, but the
 // contents of each toast are for the message center and layout strategy would
 // be slightly different.
 class MESSAGE_CENTER_EXPORT MessagePopupCollection
-    : public views::WidgetObserver,
+    : public MessageCenterObserver,
       public base::SupportsWeakPtr<MessagePopupCollection> {
  public:
   // |parent| specifies the parent widget of the toast windows. The default
   // parent will be used for NULL.
   MessagePopupCollection(gfx::NativeView parent,
                          MessageCenter* message_center);
   virtual ~MessagePopupCollection();
 
-  void UpdatePopups();
-
   void OnMouseEntered();
   void OnMouseExited();
 
  private:
   FRIEND_TEST_ALL_PREFIXES(ash::WebNotificationTrayTest,
                            ManyPopupNotifications);
+  friend class test::MessagePopupCollectionTest;
   typedef std::map<std::string, ToastContentsView*> ToastContainer;
 
   void CloseAllWidgets();
 
-  // Overridden from views::WidgetObserver:
-  virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE;
+  // Returns the bottom-right position of the current work area.
+  gfx::Point GetWorkAreaBottomRight();
+
+  // Creates new widgets for new toast notifications, and updates |toasts_| and
+  // |widgets_| correctly.
+  void UpdateWidgets();
+
+  // Repositions all of the widgets based on the current work area.
+  void RepositionWidgets();
+
+  // Repositions widgets. |target_rrect| denotes the region of the notification
+  // recently removed, and this attempts to slide widgets so that the user can
+  // click close-button without mouse moves. See crbug.com/224089
+  void RepositionWidgetsWithTarget(const gfx::Rect& target_rect);
+
+  // Overridden from MessageCenterObserver:
+  virtual void OnNotificationAdded(const std::string& notification_id) OVERRIDE;
+  virtual void OnNotificationRemoved(const std::string& notification_id,
+                                     bool by_user) OVERRIDE;
+  virtual void OnNotificationUpdated(
+      const std::string& notification_id) OVERRIDE;
+
+  void SetWorkAreaForTest(const gfx::Rect& work_area);
 
   gfx::NativeView parent_;
   MessageCenter* message_center_;
   ToastContainer toasts_;
+  std::list<views::Widget*> widgets_;
+  gfx::Rect work_area_;
 
   DISALLOW_COPY_AND_ASSIGN(MessagePopupCollection);
 };
 
 }  // namespace message_center
 
 #endif // UI_MESSAGE_CENTER_VIEWS_MESSAGE_POPUP_COLLECTION_H_