Add unittest for MessageListView

ui/message_center/views/message_list_view.cc

 // 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.
 
 #include "base/command_line.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "ui/gfx/animation/slide_animation.h"
 #include "ui/message_center/message_center_style.h"
 #include "ui/message_center/message_center_switches.h"
 #include "ui/message_center/views/message_center_view.h"
 #include "ui/message_center/views/message_list_view.h"
 #include "ui/message_center/views/message_view.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
 #include "ui/views/layout/box_layout.h"
 #include "ui/views/widget/widget.h"
 
 namespace message_center {
 
 namespace {
 const int kAnimateClearingNextNotificationDelayMS = 40;
 }  // namespace
 
-MessageListView::MessageListView(MessageCenterView* message_center_view,
-                                 bool top_down)
-    : message_center_view_(message_center_view),
-      reposition_top_(-1),
+MessageListView::MessageListView(bool top_down)
+    : reposition_top_(-1),
       fixed_height_(0),
       has_deferred_task_(false),
       clear_all_started_(false),
       top_down_(top_down),
       animator_(this),
       quit_message_loop_after_animation_for_test_(false),
       weak_ptr_factory_(this) {
   views::BoxLayout* layout =
       new views::BoxLayout(views::BoxLayout::kVertical, 0, 0, 1);
   layout->SetDefaultFlex(1);
@@ skipping 162 matching lines @@
     MessageView* child = (MessageView*)child_at(i);
     if (!child->visible())
       continue;
     if (gfx::IntersectRects(child->bounds(), visible_scroll_rect).IsEmpty())
       continue;
     if (child->IsPinned())
       continue;
     clearing_all_views_.push_back(child);
   }
   if (clearing_all_views_.empty()) {
-    message_center_view()->OnAllNotificationsCleared();
+    for (auto& observer : observers_)
+      observer.OnAllNotificationsCleared();
   } else {
     DoUpdateIfPossible();
   }
 }
 
+void MessageListView::AddObserver(MessageListView::Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void MessageListView::RemoveObserver(MessageListView::Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
 void MessageListView::OnBoundsAnimatorProgressed(
     views::BoundsAnimator* animator) {
   DCHECK_EQ(&animator_, animator);
   for (auto view : deleted_when_done_) {
     const gfx::SlideAnimation* animation = animator->GetAnimationForView(view);
     if (animation)
       view->layer()->SetOpacity(animation->CurrentValueBetween(1.0, 0.0));
   }
 }
 
 void MessageListView::OnBoundsAnimatorDone(views::BoundsAnimator* animator) {
   for (auto view : deleted_when_done_)
     delete view;
   deleted_when_done_.clear();
 
   if (clear_all_started_) {
     clear_all_started_ = false;
-    message_center_view()->OnAllNotificationsCleared();
+    for (auto& observer : observers_)
+      observer.OnAllNotificationsCleared();
   }
 
   if (has_deferred_task_) {
     has_deferred_task_ = false;
     DoUpdateIfPossible();
   }
 
   if (GetWidget())
     GetWidget()->SynthesizeMouseMoveEvent();
 
@@ skipping 219 matching lines @@
         base::TimeDelta::FromMilliseconds(
             kAnimateClearingNextNotificationDelayMS));
   }
 }
 
 void MessageListView::SetRepositionTargetForTest(const gfx::Rect& target_rect) {
   SetRepositionTarget(target_rect);
 }
 
 }  // namespace message_center