Pull MessageListView into its own file for easier testing.

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 "ui/compositor/paint_context.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/message_center/notification.h"
+#include "ui/views/animation/bounds_animator_observer.h"
+#include "ui/views/view.h"
+
+namespace gfx {
+class Canvas;
+}
+
+namespace ui {
+class Layer;
+}
+
+namespace views {
+class BoundsAnimator;
+}
+
+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 {
+ public:
+  explicit MessageListView(MessageCenterView* message_center_view,
+                           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 ClearAllNotifications(const gfx::Rect& visible_scroll_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:
+  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);
+
+  // Animate clearing one notification.
+  void AnimateClearingOneNotification();
+  MessageCenterView* message_center_view() const {
+    return message_center_view_;
+  }
+
+  MessageCenterView* message_center_view_;  // Weak reference.
+  // 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_;
+  scoped_ptr<views::BoundsAnimator> animator_;
+  base::WeakPtrFactory<MessageListView> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(MessageListView);
+};
+
+}  // namespace message_center
+#endif  // UI_MESSAGE_CENTER_VIEWS_MESSAGE_LIST_VIEW_H_