[Refactor] Moved scrollbar creation and deletion to ScrollbarManager

third_party/WebKit/Source/core/frame/LocalFrameView.h

 /*
    Copyright (C) 1997 Martin Jones (mjones@kde.org)
              (C) 1998 Waldo Bastian (bastian@kde.org)
              (C) 1998, 1999 Torben Weis (weis@kde.org)
              (C) 1999 Lars Knoll (knoll@kde.org)
              (C) 1999 Antti Koivisto (koivisto@kde.org)
    Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights
    reserved.
 
    This library is free software; you can redistribute it and/or
@@ skipping 50 matching lines @@
 #include "platform/wtf/text/WTFString.h"
 #include "public/platform/ShapeProperties.h"
 #include "public/platform/WebDisplayMode.h"
 #include "public/platform/WebRect.h"
 
 namespace blink {
 
 class AXObjectCache;
 class Cursor;
 class DocumentLifecycle;
-class Element;
 class ElementVisibilityObserver;
 class Frame;
 class FloatSize;
 class IntRect;
 class JSONArray;
 class JSONObject;
 class LayoutEmbeddedContent;
 class LayoutItem;
 class LayoutViewItem;
 class LocalFrame;
@@ skipping 808 matching lines @@
   class ScrollbarManager : public blink::ScrollbarManager {
     DISALLOW_NEW();
 
     // Helper class to manage the life cycle of Scrollbar objects.
    public:
     ScrollbarManager(LocalFrameView& scroller)
         : blink::ScrollbarManager(scroller) {}
 
     void SetHasHorizontalScrollbar(bool has_scrollbar) override;
     void SetHasVerticalScrollbar(bool has_scrollbar) override;
-
-    // TODO(ymalik): This should be hidden and all calls should go through
-    // setHas*Scrollbar functions above.
-    Scrollbar* CreateScrollbar(ScrollbarOrientation) override;
-
-   protected:
-    void DestroyScrollbar(ScrollbarOrientation) override;
   };
 
   LocalFrameView* ParentFrameView() const;
 
   void UpdateScrollOffset(const ScrollOffset&, ScrollType) override;
 
   void UpdateScrollbarEnabledState();
 
   void DispatchEventsForPrintingOnAllFrames();
 
@@ skipping 34 matching lines @@
   void ScheduleOrPerformPostLayoutTasks();
   void PerformPostLayoutTasks();
 
   void RecordDeferredLoadingStats();
 
   DocumentLifecycle& Lifecycle() const;
 
   void ContentsResized() override;
   void ScrollbarExistenceMaybeChanged();
 
+  LayoutObject* LayoutObjectForScrollbars() const override;
+
   // Methods to do point conversion via layoutObjects, in order to take
   // transforms into account.
   IntRect ConvertToContainingEmbeddedContentView(const IntRect&) const;
   IntPoint ConvertToContainingEmbeddedContentView(const IntPoint&) const;
   IntRect ConvertFromContainingEmbeddedContentView(const IntRect&) const;
   IntPoint ConvertFromContainingEmbeddedContentView(const IntPoint&) const;
 
   void DidChangeGlobalRootScroller() override;
 
   void UpdateGeometriesIfNeeded();
@@ skipping 15 matching lines @@
   void UpdateLayersAndCompositingAfterScrollIfNeeded();
 
   static bool ComputeCompositedSelection(LocalFrame&, CompositedSelection&);
   void UpdateCompositedSelectionIfNeeded();
   void SetNeedsCompositingUpdate(CompositingUpdateType);
 
   // Returns true if the LocalFrameView's own scrollbars overlay its content
   // when visible.
   bool HasOverlayScrollbars() const;
 
-  // Returns true if the frame should use custom scrollbars. If true, sets
-  // customScrollbarElement to the element that supplies the scrollbar's style
-  // information.
-  bool ShouldUseCustomScrollbars(Element*& custom_scrollbar_element) const;
-
   // Returns true if a scrollbar needs to go from native -> custom or vice
   // versa, or if a custom scrollbar has a stale owner.
   bool NeedsScrollbarReconstruction() const;
 
   bool ShouldIgnoreOverflowHidden() const;
 
   void UpdateScrollCorner();
 
   AXObjectCache* AxObjectCache() const;
 
@@ skipping 261 matching lines @@
                   embedded_content_view.IsLocalFrameView());
 DEFINE_TYPE_CASTS(LocalFrameView,
                   ScrollableArea,
                   scrollableArea,
                   scrollableArea->IsLocalFrameView(),
                   scrollableArea.IsLocalFrameView());
 
 }  // namespace blink
 
 #endif  // LocalFrameView_h