It is time.

ui/views/controls/glow_hover_controller.h

-// Copyright (c) 2012 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_CONTROLS_GLOW_HOVER_CONTROLLER_H_
-#define UI_VIEWS_CONTROLS_GLOW_HOVER_CONTROLLER_H_
-
-#include "ui/gfx/animation/animation_delegate.h"
-#include "ui/gfx/animation/slide_animation.h"
-#include "ui/views/views_export.h"
-
-namespace gfx {
-class Canvas;
-class ImageSkia;
-class Point;
-}
-
-namespace views {
-
-class View;
-
-// GlowHoverController is responsible for drawing a hover effect as is used by
-// the tabstrip. Typical usage:
-//   OnMouseEntered() -> invoke Show().
-//   OnMouseMoved()   -> invoke SetLocation().
-//   OnMouseExited()  -> invoke Hide().
-//   OnPaint()        -> if ShouldDraw() returns true invoke Draw().
-// Internally GlowHoverController uses an animation to animate the glow and
-// invokes SchedulePaint() back on the View as necessary.
-class VIEWS_EXPORT GlowHoverController : public gfx::AnimationDelegate {
- public:
-  enum Style {
-    SUBTLE,
-    PRONOUNCED
-  };
-
-  explicit GlowHoverController(views::View* view);
-  virtual ~GlowHoverController();
-
-  // Sets the AnimationContainer used by the animation.
-  void SetAnimationContainer(gfx::AnimationContainer* container);
-
-  // Sets the location of the hover, relative to the View passed to the
-  // constructor.
-  void SetLocation(const gfx::Point& location);
-
-  // Initiates showing the hover.
-  void Show(Style style);
-
-  // Hides the hover.
-  void Hide();
-
-  // Hides the hover immediately.
-  void HideImmediately();
-
-  // Returns the value of the animation.
-  double GetAnimationValue() const;
-
-  // Returns true if there is something to be drawn. Use this instead of
-  // invoking Draw() if creating |mask_image| is expensive.
-  bool ShouldDraw() const;
-
-  // If the hover is currently visible it is drawn to the supplied canvas.
-  // |mask_image| is used to determine what parts of the canvas to draw on.
-  void Draw(gfx::Canvas* canvas, const gfx::ImageSkia& mask_image) const;
-
-  // gfx::AnimationDelegate overrides:
-  virtual void AnimationEnded(const gfx::Animation* animation) override;
-  virtual void AnimationProgressed(const gfx::Animation* animation) override;
-
- private:
-  // View we're drawing to.
-  views::View* view_;
-
-  // Opacity of the glow ramps up over time.
-  gfx::SlideAnimation animation_;
-
-  // Location of the glow, relative to view.
-  gfx::Point location_;
-  double opacity_scale_;
-
-  DISALLOW_COPY_AND_ASSIGN(GlowHoverController);
-};
-
-}  // namespace views
-
-#endif  // UI_VIEWS_CONTROLS_GLOW_HOVER_CONTROLLER_H_