Added material design mouse hover feedback support.

ui/views/animation/ink_drop_animation_controller_impl.h

 // Copyright 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_VIEWS_ANIMATION_INK_DROP_ANIMATION_CONTROLLER_IMPL_H_
 #define UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_CONTROLLER_IMPL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/views/animation/ink_drop_animation_controller.h"
 #include "ui/views/animation/ink_drop_animation_observer.h"
 #include "ui/views/views_export.h"
 
 namespace views {
 class InkDropAnimation;
 class InkDropHost;
+class InkDropHover;
 
 // A functional implementation of an InkDropAnimationController.
 class VIEWS_EXPORT InkDropAnimationControllerImpl
     : public InkDropAnimationController,
       public InkDropAnimationObserver {
  public:
   // Constructs an ink drop controller that will attach the ink drop to the
   // given |ink_drop_host|.
   explicit InkDropAnimationControllerImpl(InkDropHost* ink_drop_host);
   ~InkDropAnimationControllerImpl() override;
 
   // InkDropAnimationController:
   InkDropState GetInkDropState() const override;
   void AnimateToState(InkDropState ink_drop_state) override;
+  void SetHovered(bool is_hovered) override;
+  bool IsHovered() const override;
   gfx::Size GetInkDropLargeSize() const override;
   void SetInkDropSize(const gfx::Size& large_size,
                       int large_corner_radius,
                       const gfx::Size& small_size,
                       int small_corner_radius) override;
   void SetInkDropCenter(const gfx::Point& center_point) override;
 
  private:
   // Creates a new InkDropAnimation and sets it to |ink_drop_animation_|. If
   // |ink_drop_animation_| wasn't null then it will be destroyed using
   // DestroyInkDropAnimation().
   void CreateInkDropAnimation();
 
   // Destroys the current |ink_drop_animation_|.
   void DestroyInkDropAnimation();
 
+  // Creates a new InkDropHover and sets it to |hover_|. If |hover_| wasn't null
+  // then it will be destroyed using DestroyInkDropHover().
+  void CreateInkDropHover();
+
+  // Destroys the current |hover_|.
+  void DestroyInkDropHover();
+
   // views::InkDropAnimationObserver:
   void InkDropAnimationStarted(InkDropState ink_drop_state) override;
   void InkDropAnimationEnded(InkDropState ink_drop_state,
                              InkDropAnimationEndedReason reason) override;
 
   // The host of the ink drop.
   InkDropHost* ink_drop_host_;
 
   // Cached size for the ink drop's large size animations.
   gfx::Size ink_drop_large_size_;
 
   // Cached corner radius for the ink drop's large size animations.
   int ink_drop_large_corner_radius_;
 
   // Cached size for the ink drop's small size animations.
   gfx::Size ink_drop_small_size_;
 
   // Cached corner radius for the ink drop's small size animations.
   int ink_drop_small_corner_radius_;
 
   // Cached center point for the ink drop.
   gfx::Point ink_drop_center_;
 
+  // The root Layer that parents the InkDropAnimation layers and the
+  // InkDropHover layers. The |root_layer_| is the one that is added and removed
+  // from the InkDropHost.
+  scoped_ptr<ui::Layer> root_layer_;
+
+  // The current InkDropHover. Lazily created using CreateInkDropHover();
+  scoped_ptr<InkDropHover> hover_;
+
+  // Tracks whether the ink drop is currently in a hover state or not. Note this
+  // will not always have the same value as |hover_|->is_hovered() because the
+  // hover layer is faded out when the ink drop ripple is active.
+  bool is_hovered_;
+
   // The current InkDropAnimation. Created on demand using
   // CreateInkDropAnimation().
   scoped_ptr<InkDropAnimation> ink_drop_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(InkDropAnimationControllerImpl);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_ANIMATION_INK_DROP_ANIMATION_CONTROLLER_IMPL_H_