Refactor GestureNavigation to eliminate code redundancy

content/browser/web_contents/web_contents_view_aura.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 CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 #define CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/browser/renderer_host/overscroll_controller_delegate.h"
 #include "content/browser/renderer_host/render_view_host_delegate_view.h"
 #include "content/browser/web_contents/web_contents_view.h"
 #include "content/common/content_export.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/aura/window_observer.h"
-#include "ui/compositor/layer_animation_observer.h"
 #include "ui/wm/public/drag_drop_delegate.h"
 
 namespace aura {
 class Window;
 }
 
 namespace ui {
 class DropTargetEvent;
 }
 
 namespace content {
 class GestureNavSimple;
 class OverscrollNavigationOverlay;
+class OverscrollWindowAnimation;
 class RenderWidgetHostImpl;
 class RenderWidgetHostViewAura;
 class ShadowLayerDelegate;
 class TouchEditableImplAura;
 class WebContentsViewDelegate;
 class WebContentsImpl;
 class WebDragDestDelegate;
 
 class WebContentsViewAura
     : public WebContentsView,
       public RenderViewHostDelegateView,
       public OverscrollControllerDelegate,
-      public ui::ImplicitAnimationObserver,
       public aura::WindowDelegate,
       public aura::client::DragDropDelegate,
       public aura::WindowObserver {
  public:
   WebContentsViewAura(WebContentsImpl* web_contents,
                       WebContentsViewDelegate* delegate);
 
   CONTENT_EXPORT void SetTouchEditableForTest(
       TouchEditableImplAura* touch_editable);
 
  private:
   class WindowObserver;
 
   ~WebContentsViewAura() override;
 
   void SizeChangedCommon(const gfx::Size& size);
 
   void EndDrag(blink::WebDragOperationsMask ops);
 
   void InstallOverscrollControllerDelegate(RenderWidgetHostViewAura* view);
 
-  // Creates and sets up the overlay window that will be displayed during the
-  // overscroll gesture.
-  void PrepareOverscrollWindow();
-
   // Sets up the content window in preparation for starting an overscroll
   // gesture.
   void PrepareContentWindowForOverscroll();
 
-  // Resets any in-progress animation for the overscroll gesture. Note that this
-  // doesn't immediately reset the internal states; that happens after an
-  // animation.
-  void ResetOverscrollTransform();
-
   // Completes the navigation in response to a completed overscroll gesture.
   // The navigation happens after an animation (either the overlay window
   // animates in, or the content window animates out).
   void CompleteOverscrollNavigation(OverscrollMode mode);
 
-  // Returns the window that should be animated for the overscroll gesture.
-  // (note that during the overscroll gesture, either the overlay window or the
-  // content window can be animated).
-  aura::Window* GetWindowToAnimateForOverscroll();
-
-  // Returns the amount the animating window should be translated in response to
-  // the overscroll gesture.
-  gfx::Vector2dF GetTranslationForOverscroll(float delta_x, float delta_y);
-
-  // A window showing the screenshot is overlayed during a navigation triggered
-  // by overscroll. This function sets this up.
-  void PrepareOverscrollNavigationOverlay();
-
   // Changes the brightness of the layer depending on the amount of horizontal
   // overscroll (|delta_x|, in pixels).
   void UpdateOverscrollWindowBrightness(float delta_x);
 
   void AttachTouchEditableToRenderView();
 
   void OverscrollUpdateForWebContentsDelegate(float delta_y);
 
   // Overridden from WebContentsView:
   gfx::NativeView GetNativeView() const override;
@@ skipping 37 matching lines @@
       const base::Callback<void(ui::MouseEvent*)>& mouse_cb) override;
   void HideDisambiguationPopup() override;
 
   // Overridden from 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;
 
-  // Overridden from ui::ImplicitAnimationObserver:
-  void OnImplicitAnimationsCompleted() override;
-
   // Overridden from aura::WindowDelegate:
   gfx::Size GetMinimumSize() const override;
   gfx::Size GetMaximumSize() const override;
   void OnBoundsChanged(const gfx::Rect& old_bounds,
                        const gfx::Rect& new_bounds) override;
   ui::TextInputClient* GetFocusedTextInputClient() override;
   gfx::NativeCursor GetCursor(const gfx::Point& point) override;
   int GetNonClientComponent(const gfx::Point& point) const override;
   bool ShouldDescendIntoChildForEventHandling(
       aura::Window* child,
@@ skipping 19 matching lines @@
   int OnPerformDrop(const ui::DropTargetEvent& event) override;
 
   // Overridden from aura::WindowObserver:
   void OnWindowVisibilityChanged(aura::Window* window, bool visible) override;
 
   // Update the web contents visiblity.
   void UpdateWebContentsVisibility(bool visible);
 
   scoped_ptr<aura::Window> window_;
 
-  // The window that shows the screenshot of the history page during an
-  // overscroll navigation gesture.
-  scoped_ptr<aura::Window> overscroll_window_;
-
   scoped_ptr<WindowObserver> window_observer_;
 
   // The WebContentsImpl whose contents we display.
   WebContentsImpl* web_contents_;
 
   scoped_ptr<WebContentsViewDelegate> delegate_;
 
   blink::WebDragOperationsMask current_drag_op_;
 
   scoped_ptr<DropData> current_drop_data_;
 
   WebDragDestDelegate* drag_dest_delegate_;
 
   // We keep track of the render view host we're dragging over.  If it changes
   // during a drag, we need to re-send the DragEnter message.  WARNING:
   // this pointer should never be dereferenced.  We only use it for comparing
   // pointers.
   void* current_rvh_for_drag_;
 
-  bool overscroll_change_brightness_;
-
   // The overscroll gesture currently in progress.
   OverscrollMode current_overscroll_gesture_;
 
   // This is the completed overscroll gesture. This is used for the animation
   // callback that happens in response to a completed overscroll gesture.
   OverscrollMode completed_overscroll_gesture_;
 
   // This manages the overlay window that shows the screenshot during a history
   // navigation triggered by the overscroll gesture.
   scoped_ptr<OverscrollNavigationOverlay> navigation_overlay_;
 
-  scoped_ptr<ShadowLayerDelegate> overscroll_shadow_;
+  // Receives overscroll events and manages the overscroll animation.
+  OverscrollWindowAnimation* overscroll_window_animation_;
 
   scoped_ptr<TouchEditableImplAura> touch_editable_;
   scoped_ptr<GestureNavSimple> gesture_nav_simple_;
 
   // On Windows we can run into problems if resources get released within the
   // initialization phase while the content (and its dimensions) are not known.
   bool is_or_was_visible_;
 
   DISALLOW_COPY_AND_ASSIGN(WebContentsViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_WEB_CONTENTS_WEB_CONTENTS_VIEW_AURA_H_