Refactoring to make adding ink drop animations easier

ui/views/animation/toolbar_ink_drop_delegate.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_TOOLBAR_INK_DROP_DELEGATE_H_
+#define UI_VIEWS_ANIMATION_TOOLBAR_INK_DROP_DELEGATE_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/events/event_handler.h"
+#include "ui/views/animation/ink_drop_delegate.h"
+#include "ui/views/views_export.h"
+
+namespace ui {
+class EventTarget;
+class ScopedTargetHandler;
+}
+
+namespace views {
+
+class InkDropAnimationController;
+class InkDropHost;
+
+// An InkDropDelegate that handles animations for toolbar buttons.
+class VIEWS_EXPORT ToolbarInkDropDelegate : public InkDropDelegate,
+                                            public ui::EventHandler {
+ public:
+  ToolbarInkDropDelegate(InkDropHost* ink_drop_host,
+                         ui::EventTarget* target);
+  ~ToolbarInkDropDelegate() override;
+
+  // InkDropDelegate:
+  void SetInkDropSize(int large_size,
+                      int large_corner_radius,
+                      int small_size,
+                      int small_corner_radius) override;
+  void OnLayout() override;
+  void OnAction(InkDropState state) override;
+
+  // ui::EventHandler:
+  void OnEvent(ui::Event* event) override;
+  void OnKeyEvent(ui::KeyEvent* event) override;
+  void OnMouseEvent(ui::MouseEvent* event) override;
+  void OnScrollEvent(ui::ScrollEvent* event) override;
+  void OnTouchEvent(ui::TouchEvent* event) override;
+  void OnGestureEvent(ui::GestureEvent* event) override;
+  void OnCancelMode(ui::CancelModeEvent* event) override;
+
+ private:
+  // An EventHandler that gets a chance to handle events before or after |this|.
+  ui::EventHandler* event_handler_;
+
+  // Safely replaces a target handler for the lifetime of |this|.
+  scoped_ptr<ui::ScopedTargetHandler> target_handler_;
+
+  // Parent InkDropHost (typically a View) that hosts the ink ripple animations.
+  InkDropHost* ink_drop_host_;
+
+  // Animation controller for the ink drop ripple effect.
+  scoped_ptr<InkDropAnimationController> ink_drop_animation_controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(ToolbarInkDropDelegate);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_ANIMATION_TOOLBAR_INK_DROP_DELEGATE_H_