Extract the view of control buttons on notification into a separated class

ui/arc/notification/arc_notification_content_view.h

 // Copyright 2016 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_ARC_NOTIFICATION_ARC_NOTIFICATION_CONTENT_VIEW_H_
 #define UI_ARC_NOTIFICATION_ARC_NOTIFICATION_CONTENT_VIEW_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "ui/arc/notification/arc_notification_content_view_delegate.h"
 #include "ui/arc/notification/arc_notification_item.h"
 #include "ui/arc/notification/arc_notification_surface_manager.h"
 #include "ui/aura/window_observer.h"
-#include "ui/gfx/animation/animation_delegate.h"
-#include "ui/message_center/views/padded_button.h"
-#include "ui/views/controls/button/button.h"
 #include "ui/views/controls/native/native_view_host.h"
 
-namespace gfx {
-class LinearAnimation;
+namespace message_center {
+class NotificationControlButtonsView;
 }
 
 namespace ui {
 struct AXActionData;
 }
 
 namespace views {
 class FocusTraversable;
 class Widget;
 }
 
 namespace arc {
 
 class ArcNotificationSurface;
 
 // ArcNotificationContentView is a view to host NotificationSurface and show the
 // content in itself. This is implemented as a child of ArcNotificationView.
 class ArcNotificationContentView
     : public views::NativeViewHost,
-      public views::ButtonListener,
       public aura::WindowObserver,
       public ArcNotificationItem::Observer,
-      public ArcNotificationSurfaceManager::Observer,
-      public gfx::AnimationDelegate {
+      public ArcNotificationSurfaceManager::Observer {
  public:
   static const char kViewClassName[];
 
   explicit ArcNotificationContentView(ArcNotificationItem* item);
   ~ArcNotificationContentView() override;
 
   // views::View overrides:
   const char* GetClassName() const override;
 
   std::unique_ptr<ArcNotificationContentViewDelegate>
   CreateContentViewDelegate();
 
  private:
   friend class ArcNotificationContentViewTest;
 
   class ContentViewDelegate;
   class EventForwarder;
   class SettingsButton;
   class SlideHelper;
 
-  // A image button class used for the settings button and the close button.
-  // We can't use forward declaration for this class due to std::unique_ptr<>
-  // requires size of this class.
-  class ControlButton : public message_center::PaddedButton {
-   public:
-    explicit ControlButton(ArcNotificationContentView* owner);
-    void OnFocus() override;
-    void OnBlur() override;
-
-   private:
-    ArcNotificationContentView* const owner_;
-
-    DISALLOW_COPY_AND_ASSIGN(ControlButton);
-  };
-
   void CreateCloseButton();
   void CreateSettingsButton();
   void MaybeCreateFloatingControlButtons();
   void SetSurface(ArcNotificationSurface* surface);
   void UpdatePreferredSize();
   void UpdateControlButtonsVisibility();
   void UpdatePinnedState();
   void UpdateSnapshot();
   void AttachSurface();
   void ActivateToast();
-  void StartControlButtonsColorAnimation();
-  bool ShouldUpdateControlButtonsColor() const;
   void UpdateAccessibleName();
 
   // views::NativeViewHost
   void ViewHierarchyChanged(
       const ViewHierarchyChangedDetails& details) override;
   void Layout() override;
   void OnPaint(gfx::Canvas* canvas) override;
   void OnMouseEntered(const ui::MouseEvent& event) override;
   void OnMouseExited(const ui::MouseEvent& event) override;
   void OnFocus() override;
   void OnBlur() override;
   views::FocusTraversable* GetFocusTraversable() override;
   bool HandleAccessibleAction(const ui::AXActionData& action) override;
   void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
 
-  // views::ButtonListener
-  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
-
   // aura::WindowObserver
   void OnWindowBoundsChanged(aura::Window* window,
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
   void OnWindowDestroying(aura::Window* window) override;
 
   // ArcNotificationItem::Observer
   void OnItemDestroying() override;
   void OnItemUpdated() override;
 
   // ArcNotificationSurfaceManager::Observer:
   void OnNotificationSurfaceAdded(ArcNotificationSurface* surface) override;
   void OnNotificationSurfaceRemoved(ArcNotificationSurface* surface) override;
 
-  // AnimationDelegate
-  void AnimationEnded(const gfx::Animation* animation) override;
-  void AnimationProgressed(const gfx::Animation* animation) override;
-
   // If |item_| is null, we may be about to be destroyed. In this case,
   // we have to be careful about what we do.
   ArcNotificationItem* item_ = nullptr;
   ArcNotificationSurface* surface_ = nullptr;
 
   const std::string notification_key_;
 
   // A pre-target event handler to forward events on the surface to this view.
   // Using a pre-target event handler instead of a target handler on the surface
   // window because it has descendant aura::Window and the events on them need
   // to be handled as well.
   // TODO(xiyuan): Revisit after exo::Surface no longer has an aura::Window.
   std::unique_ptr<EventForwarder> event_forwarder_;
 
   // A helper to observe slide transform/animation and use surface layer copy
   // when a slide is in progress and restore the surface when it finishes.
   std::unique_ptr<SlideHelper> slide_helper_;
 
   // A control buttons on top of NotificationSurface. Needed because the
   // aura::Window of NotificationSurface is added after hosting widget's
   // RootView thus standard notification control buttons are always below
   // it.
   std::unique_ptr<views::Widget> floating_control_buttons_widget_;
 
-  views::View* control_buttons_view_ = nullptr;
-  std::unique_ptr<ControlButton> close_button_;
-  ControlButton* settings_button_ = nullptr;
+  message_center::NotificationControlButtonsView* control_buttons_view_ =
+      nullptr;
 
   // Protects from call loops between Layout and OnWindowBoundsChanged.
   bool in_layout_ = false;
 
-  std::unique_ptr<gfx::LinearAnimation> control_button_color_animation_;
-
   base::string16 accessible_name_;
 
   DISALLOW_COPY_AND_ASSIGN(ArcNotificationContentView);
 };
 
 }  // namespace arc
 
 #endif  // UI_ARC_NOTIFICATION_ARC_NOTIFICATION_CONTENT_VIEW_H_