Explicit management of FrameSelection availability

third_party/WebKit/Source/core/editing/SelectionEditor.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
@@ skipping 37 matching lines @@
     bool isContentEditable() const { return m_selection.isContentEditable(); }
     bool isContentRichlyEditable() const { return m_selection.isContentRichlyEditable(); }
 
     bool setSelectedRange(const EphemeralRange&, TextAffinity, SelectionDirectionalMode, FrameSelection::SetSelectionOptions);
 
     template <typename Strategy>
     const VisibleSelectionTemplate<Strategy>& visibleSelection() const;
     void setVisibleSelection(const VisibleSelection&, FrameSelection::SetSelectionOptions);
     void setVisibleSelection(const VisibleSelectionInFlatTree&, FrameSelection::SetSelectionOptions);
 
-    void setIsDirectional(bool);
     void setWithoutValidation(const Position& base, const Position& extent);
 
+    void documentAttached(Document*);
+    void documentDetached(const Document&);
+
     // If this FrameSelection has a logical range which is still valid, this
     // function return its clone. Otherwise, the return value from underlying
     // |VisibleSelection|'s |firstRange()| is returned.
     Range* firstRange() const;
 
     // There functions are exposed for |FrameSelection|.
     void resetLogicalRange();
     void setLogicalRange(Range*);
 
     // Updates |m_selection| and |m_selectionInFlatTree| with up-to-date
     // layout if needed.
     void updateIfNeeded();
 
     DECLARE_VIRTUAL_TRACE();
 
 private:
     explicit SelectionEditor(FrameSelection&);
 
+    const Document& document() const;
     LocalFrame* frame() const;
 
+    void clearVisibleSelection();
+    bool shouldAlwaysUseDirectionalSelection() const;
+
+    Member<Document> m_document;
     Member<FrameSelection> m_frameSelection;
 
     VisibleSelection m_selection;
     VisibleSelectionInFlatTree m_selectionInFlatTree;
     bool m_observingVisibleSelection;
 
     // The range specified by the user, which may not be visually canonicalized
     // (hence "logical"). This will be invalidated if the underlying
     // |VisibleSelection| changes. If that happens, this variable will
     // become |nullptr|, in which case logical positions == visible positions.
     Member<Range> m_logicalRange;
 };
 
 } // namespace blink
 
 #endif // SelectionEditor_h