Move DragCaretController class to its own file

Source/core/editing/DragCaretController.h

 /*
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DragCaretController_h
 #define DragCaretController_h
 
-#include "core/CoreExport.h"
-#include "core/editing/VisiblePosition.h"
-#include "platform/geometry/IntRect.h"
-#include "platform/geometry/LayoutRect.h"
-#include "wtf/Noncopyable.h"
+#include "core/editing/Caret.h"
 
 namespace blink {
 
-class LocalFrame;
-class GraphicsContext;
-class LayoutBlock;
-class LayoutView;
-
-class CORE_EXPORT CaretBase {
-    WTF_MAKE_NONCOPYABLE(CaretBase);
-    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(CaretBase);
-protected:
-    enum CaretVisibility { Visible, Hidden };
-    explicit CaretBase(CaretVisibility = Hidden);
-
-    void invalidateCaretRect(Node*, bool caretRectChanged = false);
-    void clearCaretRect();
-    // Creating VisiblePosition causes synchronous layout so we should use the
-    // PositionWithAffinity version if possible.
-    // A position in HTMLTextFromControlElement is a typical example.
-    bool updateCaretRect(Document*, const PositionWithAffinity& caretPosition);
-    bool updateCaretRect(Document*, const VisiblePosition& caretPosition);
-    IntRect absoluteBoundsForLocalRect(Node*, const LayoutRect&) const;
-    bool shouldRepaintCaret(Node&) const;
-    bool shouldRepaintCaret(const LayoutView*) const;
-    void paintCaret(Node*, GraphicsContext*, const LayoutPoint&, const LayoutRect& clipRect) const;
-
-    const LayoutRect& localCaretRectWithoutUpdate() const { return m_caretLocalRect; }
-    LayoutBlock* caretPainter() const { return m_caretPainter; }
-
-    void setCaretVisibility(CaretVisibility visibility) { m_caretVisibility = visibility; }
-    bool caretIsVisible() const { return m_caretVisibility == Visible; }
-    CaretVisibility caretVisibility() const { return m_caretVisibility; }
-
-    static LayoutBlock* caretLayoutObject(Node*);
-    static void invalidateLocalCaretRect(Node*, const LayoutRect&);
-
-private:
-    LayoutBlock* m_caretPainter; // layout object responsible for painting the caret
-    LayoutRect m_caretLocalRect; // caret rect in coords local to the layoutObject responsible for painting the caret
-    CaretVisibility m_caretVisibility;
-};
-
 class DragCaretController final : public NoBaseWillBeGarbageCollected<DragCaretController>, private CaretBase {
     WTF_MAKE_NONCOPYABLE(DragCaretController);
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(DragCaretController);
 public:
     static PassOwnPtrWillBeRawPtr<DragCaretController> create();
 
     LayoutBlock* caretLayoutObject() const { return CaretBase::caretPainter(); }
     void paintDragCaret(LocalFrame*, GraphicsContext*, const LayoutPoint&, const LayoutRect& clipRect) const;
 
     bool isContentEditable() const { return m_position.rootEditableElement(); }
     bool isContentRichlyEditable() const;
 
     bool hasCaret() const { return m_position.isNotNull(); }
     const VisiblePosition& caretPosition() { return m_position; }
     void setCaretPosition(const VisiblePosition&);
     void clear() { setCaretPosition(VisiblePosition()); }
 
     void nodeWillBeRemoved(Node&);
 
     DECLARE_TRACE();
 
 private:
     DragCaretController();
 
     VisiblePosition m_position;
 };
 
 } // namespace blink
 
-
 #endif // DragCaretController_h