Add unittest for MessageListView

ui/message_center/views/message_list_view.h

 // Copyright (c) 2015 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_LIST_VIEW_H_
 #define UI_MESSAGE_CENTER_VIEWS_MESSAGE_LIST_VIEW_H_
 
 #include <list>
 #include <set>
 
 #include "base/macros.h"
 #include "ui/compositor/paint_context.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/message_center/message_center_export.h"
 #include "ui/message_center/notification.h"
 #include "ui/views/animation/bounds_animator.h"
 #include "ui/views/animation/bounds_animator_observer.h"
 #include "ui/views/view.h"
 
 namespace ui {
 class Layer;
 }
 
 namespace message_center {
 
-class MessageCenterView;
 class MessageView;
 
 // Displays a list of messages for rich notifications. Functions as an array of
 // MessageViews and animates them on transitions. It also supports
 // repositioning.
-class MessageListView : public views::View,
-                        public views::BoundsAnimatorObserver {
+class MESSAGE_CENTER_EXPORT MessageListView
+    : public views::View,
+      public views::BoundsAnimatorObserver {
  public:
-  explicit MessageListView(MessageCenterView* message_center_view,
-                           bool top_down);
+  class Observer {
+   public:
+    virtual void OnAllNotificationsCleared() = 0;
+  };
+
+  explicit MessageListView(bool top_down);
   ~MessageListView() override;
 
   void AddNotificationAt(MessageView* view, int i);
   void RemoveNotification(MessageView* view);
   void UpdateNotification(MessageView* view, const Notification& notification);
   void SetRepositionTarget(const gfx::Rect& target_rect);
   void ResetRepositionSession();
   void ClearAllClosableNotifications(const gfx::Rect& visible_scroll_rect);
 
-  MESSAGE_CENTER_EXPORT void SetRepositionTargetForTest(
+  void AddObserver(Observer* observer);
+  void RemoveObserver(Observer* observer);
+
+  void SetRepositionTargetForTest(
       const gfx::Rect& target_rect);
 
  protected:
   // Overridden from views::View.
   void Layout() override;
   gfx::Size GetPreferredSize() const override;
   int GetHeightForWidth(int width) const override;
   void PaintChildren(const ui::PaintContext& context) override;
   void ReorderChildLayers(ui::Layer* parent_layer) override;
 
   // Overridden from views::BoundsAnimatorObserver.
   void OnBoundsAnimatorProgressed(views::BoundsAnimator* animator) override;
   void OnBoundsAnimatorDone(views::BoundsAnimator* animator) override;
 
  private:
   friend class MessageCenterViewTest;
+  friend class MessageListViewTest;
 
   bool IsValidChild(const views::View* child) const;
   void DoUpdateIfPossible();
 
   // Animates all notifications below target upwards to align with the top of
   // the last closed notification.
   void AnimateNotificationsBelowTarget();
   // Animates all notifications above target downwards to align with the top of
   // the last closed notification.
   void AnimateNotificationsAboveTarget();
 
   // Schedules animation for a child to the specified position. Returns false
   // if |child| will disappear after the animation.
   bool AnimateChild(views::View* child,
                     int top,
                     int height,
                     bool animate_even_on_move);
 
   // Animate clearing one notification.
   void AnimateClearingOneNotification();
-  MessageCenterView* message_center_view() const {
-    return message_center_view_;
-  }
 
-  MessageCenterView* message_center_view_;  // Weak reference.
+  // List of MessageListView::Observer
+  base::ObserverList<Observer> observers_;
+
   // The top position of the reposition target rectangle.
   int reposition_top_;
   int fixed_height_;
   bool has_deferred_task_;
   bool clear_all_started_;
   bool top_down_;
   std::set<views::View*> adding_views_;
   std::set<views::View*> deleting_views_;
   std::set<views::View*> deleted_when_done_;
   std::list<views::View*> clearing_all_views_;
   views::BoundsAnimator animator_;
 
   // If true, the message loop will be quitted after the animation finishes.
   // This is just for tests and has no setter.
   bool quit_message_loop_after_animation_for_test_;
 
   base::WeakPtrFactory<MessageListView> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(MessageListView);
 };
 
 }  // namespace message_center
+
 #endif  // UI_MESSAGE_CENTER_VIEWS_MESSAGE_LIST_VIEW_H_