Added material design mouse hover feedback support.

ui/views/animation/ink_drop_painted_layer_delegates.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_PAINTED_LAYER_DELEGATES_H_
+#define UI_VIEWS_ANIMATION_INK_DROP_PAINTED_LAYER_DELEGATES_H_
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/compositor/layer_delegate.h"
+#include "ui/gfx/geometry/rect.h"
+#include "ui/gfx/geometry/size.h"
+
+namespace views {
+
+// Base ui::LayerDelegate stub that can be extended to paint shapes of a
+// specific color.
+class BasePaintedLayerDelegate : public ui::LayerDelegate {
+ public:
+  ~BasePaintedLayerDelegate() override;
+
+  SkColor color() const { return color_; }
+
+  // ui::LayerDelegate:
+  void OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) override;
+  void OnDeviceScaleFactorChanged(float device_scale_factor) override;
+  base::Closure PrepareForLayerBoundsChange() override;
+
+ protected:
+  explicit BasePaintedLayerDelegate(SkColor color);
+
+ private:
+  // The color to paint.
+  SkColor color_;
+
+  DISALLOW_COPY_AND_ASSIGN(BasePaintedLayerDelegate);
+};
+
+// A BasePaintedLayerDelegate that paints a circle of a specified color and
+// radius.
+class CircleLayerDelegate : public BasePaintedLayerDelegate {
+ public:
+  CircleLayerDelegate(SkColor color, int radius);
+  ~CircleLayerDelegate() override;
+
+  int radius() const { return radius_; }
+
+  // ui::LayerDelegate:
+  void OnPaintLayer(const ui::PaintContext& context) override;
+
+ private:
+  // The radius of the circle.
+  int radius_;
+
+  DISALLOW_COPY_AND_ASSIGN(CircleLayerDelegate);
+};
+
+// A BasePaintedLayerDelegate that paints a rectangle of a specified color and
+// size.
+class RectangleLayerDelegate : public BasePaintedLayerDelegate {
+ public:
+  RectangleLayerDelegate(SkColor color, gfx::Size size);
+  ~RectangleLayerDelegate() override;
+
+  const gfx::Size& size() const { return size_; }
+
+  // ui::LayerDelegate:
+  void OnPaintLayer(const ui::PaintContext& context) override;
+
+ private:
+  // The size of the rectangle.
+  gfx::Size size_;
+
+  DISALLOW_COPY_AND_ASSIGN(RectangleLayerDelegate);
+};
+
+// A BasePaintedLayerDelegate that paints a rounded rectangle of a specified
+// color, size and corner radius.
+class RoundedRectangleLayerDelegate : public BasePaintedLayerDelegate {
+ public:
+  RoundedRectangleLayerDelegate(SkColor color,
+                                gfx::Size size,
+                                int corner_radius);
+  ~RoundedRectangleLayerDelegate() override;
+
+  const gfx::Size& size() const { return size_; }
+
+  // ui::LayerDelegate:
+  void OnPaintLayer(const ui::PaintContext& context) override;
+
+ private:
+  // The size of the rectangle.
+  gfx::Size size_;
+
+  // The radius of the corners.
+  int corner_radius_;
+
+  DISALLOW_COPY_AND_ASSIGN(RoundedRectangleLayerDelegate);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_ANIMATION_INK_DROP_PAINTED_LAYER_DELEGATES_H_