Revert of Refactor GestureNavigation to eliminate code redundancy

content/browser/web_contents/aura/overscroll_window_animation.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 CONTENT_BROWSER_WEB_CONTENTS_AURA_OVERSCROLL_WINDOW_ANIMATION_H_
-#define CONTENT_BROWSER_WEB_CONTENTS_AURA_OVERSCROLL_WINDOW_ANIMATION_H_
-
-#include "base/gtest_prod_util.h"
-#include "content/browser/renderer_host/overscroll_controller_delegate.h"
-#include "content/common/content_export.h"
-#include "ui/compositor/layer_animation_observer.h"
-
-namespace aura {
-class Window;
-}
-
-namespace ui {
-class Layer;
-class LayerAnimator;
-}
-
-namespace content {
-
-class ShadowLayerDelegate;
-class WebContentsImpl;
-
-// Manages the animation of a window sliding on top or behind another one. The
-// main window, which is the one displayed before the animation starts, is not
-// owned by OverscrollWindowAnimation, while the slide window, created at the
-// start of the animation, is owned by us for its duration.
-class CONTENT_EXPORT OverscrollWindowAnimation
-    : public OverscrollControllerDelegate,
-      ui::ImplicitAnimationObserver {
- public:
-  // The direction of this animation. SLIDE_FRONT indicates that the main window
-  // stays still while the slide window moves on top of it, entering in from the
-  // right. SLIDE_BACK means that the main window is animated to the right,
-  // revealing the slide  window in the back, which stays still. SLIDE_NONE
-  // means we are not animating yet. Left and right are reversed for RTL
-  // languages, but stack order remains unchanged.
-  enum Direction { SLIDE_FRONT, SLIDE_BACK, SLIDE_NONE };
-
-  // Delegate class that interfaces with the window animation.
-  class CONTENT_EXPORT Delegate {
-   public:
-    virtual ~Delegate() {}
-
-    // Create a slide window with the given |bounds| relative to its parent.
-    virtual scoped_ptr<aura::Window> CreateFrontWindow(
-        const gfx::Rect& bounds) = 0;
-    virtual scoped_ptr<aura::Window> CreateBackWindow(
-        const gfx::Rect& bounds) = 0;
-
-    // Returns the main window that participates in the animation. The delegate
-    // does not own this window.
-    virtual aura::Window* GetMainWindow() const = 0;
-
-    // Called when we know the animation is going to complete successfully, but
-    // before it actually completes.
-    virtual void OnOverscrollCompleting() = 0;
-
-    // Called when the animation has been completed. The slide window is
-    // transferred to the delegate.
-    virtual void OnOverscrollCompleted(scoped_ptr<aura::Window> window) = 0;
-
-    // Called when the overscroll gesture has been cancelled, after the cancel
-    // animation finishes.
-    virtual void OnOverscrollCancelled() = 0;
-  };
-
-  explicit OverscrollWindowAnimation(Delegate* delegate);
-
-  ~OverscrollWindowAnimation() override;
-
-  // Returns true if we are currently animating.
-  bool is_active() const { return !!slide_window_; }
-
-  // OverscrollControllerDelegate:
-  gfx::Rect GetVisibleBounds() const override;
-  bool OnOverscrollUpdate(float delta_x, float delta_y) override;
-  void OnOverscrollComplete(OverscrollMode overscroll_mode) override;
-  void OnOverscrollModeChange(OverscrollMode old_mode,
-                              OverscrollMode new_mode) override;
-
- private:
-  // Cancels the slide, animating the front window to its original position.
-  void CancelSlide();
-
-  // Returns a translation on the x axis for the given overscroll.
-  float GetTranslationForOverscroll(float delta_x);
-
-  // Returns the layer that is animated for the animation. The caller does not
-  // own it.
-  ui::Layer* GetFrontLayer() const;
-
-  // ui::ImplicitAnimationObserver:
-  void OnImplicitAnimationsCompleted() override;
-
-  // We own the window created for the animation.
-  scoped_ptr<aura::Window> slide_window_;
-
-  // Shadow shown under the animated layer.
-  scoped_ptr<ShadowLayerDelegate> shadow_;
-
-  // Delegate that provides the animation target and is notified of the
-  // animation state.
-  Delegate* delegate_;
-
-  // The current animation direction.
-  Direction direction_;
-
-  // Indicates if the current animation has been cancelled. True while the
-  // cancel animation is in progress.
-  bool overscroll_cancelled_;
-
-  DISALLOW_COPY_AND_ASSIGN(OverscrollWindowAnimation);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_WEB_CONTENTS_AURA_OVERSCROLL_WINDOW_ANIMATION_H_