Clean up of SelectionModel

ui/gfx/selection_model.h

 // Copyright (c) 2011 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 UI_GFX_SELECTION_MODEL_H_
 #define UI_GFX_SELECTION_MODEL_H_
 #pragma once
 
 #include <stdlib.h>
 
@@ skipping 31 matching lines @@
 // pointing to right of 'D'.
 class UI_EXPORT SelectionModel {
  public:
   enum CaretPlacement {
     LEADING,
     TRAILING,
   };
 
   SelectionModel();
   explicit SelectionModel(size_t pos);
-  SelectionModel(size_t start, size_t end);
   SelectionModel(size_t end, size_t pos, CaretPlacement status);
   SelectionModel(size_t start, size_t end, size_t pos, CaretPlacement status);
 
   virtual ~SelectionModel();
 
   size_t selection_start() const { return selection_start_; }
+  size_t selection_end() const { return selection_end_; }
+  size_t caret_pos() const { return caret_pos_; }
+  CaretPlacement caret_placement() const { return caret_placement_; }
+
+  bool Equals(const SelectionModel& sel) const;
+
+ private:
+  friend class RenderText;
+
+  void Init(size_t start, size_t end, size_t pos, CaretPlacement status);
+
   void set_selection_start(size_t pos) { selection_start_ = pos; }
-
-  size_t selection_end() const { return selection_end_; }
   void set_selection_end(size_t pos) { selection_end_ = pos; }
-
-  size_t caret_pos() const { return caret_pos_; }
   void set_caret_pos(size_t pos) { caret_pos_ = pos; }
-
-  CaretPlacement caret_placement() const { return caret_placement_; }
   void set_caret_placement(CaretPlacement placement) {
     caret_placement_ = placement;
   }
 
-  bool Equals(const SelectionModel& sel) const;
-
- private:
-  void Init(size_t start, size_t end, size_t pos, CaretPlacement status);
-
   // Logical selection start. If there is non-empty selection, if
   // selection_start_ is less than selection_end_, the selection starts visually
   // at the leading edge of the selection_start_. If selection_start_ is greater
   // than selection_end_, the selection starts visually at the trailing edge of
   // selection_start_'s previous grapheme. So, we do not need extra information
   // for visual bounding.
   size_t selection_start_;
 
   // The logical cursor position that next character will be inserted into.
   // It is also the end of the selection.
   size_t selection_end_;
 
   // The following two fields are used to guide cursor visual position.
   // The index of the character that cursor is visually attached to.
   size_t caret_pos_;
   // The visual placement of the cursor, relative to its associated character.
   CaretPlacement caret_placement_;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_SELECTION_MODEL_H_