Move computeInlineBoxPosition() to VisibleUnits.{cpp,h} from Position.{cpp,h} and VisiblePosition.h

Source/core/editing/VisibleUnits.h

 /*
  * Copyright (C) 2004 Apple Computer, 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 21 matching lines @@
 #include "platform/text/TextDirection.h"
 
 namespace blink {
 
 class LayoutRect;
 class LayoutUnit;
 class LayoutObject;
 class Node;
 class VisiblePosition;
 class IntPoint;
+class InlineBox;
 class LocalFrame;
 
 enum EWordSide { RightWordIfOnBoundary = false, LeftWordIfOnBoundary = true };
 
+struct InlineBoxPosition {
+    InlineBox* inlineBox;
+    int offsetInBox;
+
+    InlineBoxPosition()
+        : inlineBox(nullptr), offsetInBox(0)
+    {
+    }
+
+    InlineBoxPosition(InlineBox* inlineBox, int offsetInBox)
+        : inlineBox(inlineBox), offsetInBox(offsetInBox)
+    {
+    }
+};
+
 // Position
 // mostForward/BackwardCaretPosition are used for moving back and forth between
 // visually equivalent candidates.
 // For example, for the text node "foo     bar" where whitespace is
 // collapsible, there are two candidates that map to the VisiblePosition
 // between 'b' and the space, after first space and before last space.
 //
 // mostForwardCaretPosition returns the left candidate and also returs
 // [boundary, 0] for any of the positions from [boundary, 0] to the first
 // candidate in boundary, where
@@ skipping 63 matching lines @@
 VisiblePosition startOfDocument(const VisiblePosition &);
 VisiblePosition endOfDocument(const VisiblePosition &);
 bool isStartOfDocument(const VisiblePosition &);
 bool isEndOfDocument(const VisiblePosition &);
 
 // editable content
 VisiblePosition startOfEditableContent(const VisiblePosition&);
 VisiblePosition endOfEditableContent(const VisiblePosition&);
 bool isEndOfEditableOrNonEditableContent(const VisiblePosition&);
 
+CORE_EXPORT InlineBoxPosition computeInlineBoxPosition(const Position&, TextAffinity);
+CORE_EXPORT InlineBoxPosition computeInlineBoxPosition(const Position&, TextAffinity, TextDirection primaryDirection);
+CORE_EXPORT InlineBoxPosition computeInlineBoxPosition(const PositionInComposedTree&, TextAffinity);
+CORE_EXPORT InlineBoxPosition computeInlineBoxPosition(const PositionInComposedTree&, TextAffinity, TextDirection primaryDirection);
+CORE_EXPORT InlineBoxPosition computeInlineBoxPosition(const VisiblePosition&);
+
 // Rect is local to the returned layoutObject
 LayoutRect localCaretRectOfPosition(const PositionWithAffinity&, LayoutObject*&);
 bool hasRenderedNonAnonymousDescendantsWithHeight(LayoutObject*);
 
 // Returns a hit-tested VisiblePosition for the given point in contents-space
 // coordinates.
 CORE_EXPORT VisiblePosition visiblePositionForContentsPoint(const IntPoint&, LocalFrame*);
 
 CORE_EXPORT bool rendersInDifferentPosition(const Position&, const Position&);
 
 } // namespace blink
 
 #endif // VisibleUnits_h