Views: Extract text selection code from Textfield.

ui/gfx/render_text.h

 // Copyright (c) 2012 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_RENDER_TEXT_H_
 #define UI_GFX_RENDER_TEXT_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 323 matching lines @@
                   VisualCursorDirection direction,
                   SelectionBehavior selection_behavior);
 
   // Set the selection_model_ to the value of |selection|.
   // The selection range is clamped to text().length() if out of range.
   // Returns true if the cursor position or selection range changed.
   // If any index in |selection_model| is not a cursorable position (not on a
   // grapheme boundary), it is a no-op and returns false.
   bool MoveCursorTo(const SelectionModel& selection_model);
 
+  // Moves the cursor to the text index corresponding to |point|. If |select| is
+  // true, a selection is made with the current selection start index.
+  bool MoveCursorTo(const gfx::Point& point, bool select);
+
   // Set the selection_model_ based on |range|.
   // If the |range| start or end is greater than text length, it is modified
   // to be the text length.
   // If the |range| start or end is not a cursorable position (not on grapheme
   // boundary), it is a NO-OP and returns false. Otherwise, returns true.
   bool SelectRange(const Range& range);
 
   // Returns true if the local point is over selected text.
   bool IsPointInSelection(const Point& point);
 
@@ skipping 488 matching lines @@
   // Lines computed by EnsureLayout. These should be invalidated upon
   // OnLayoutTextAttributeChanged and OnDisplayTextAttributeChanged calls.
   std::vector<internal::Line> lines_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderText);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_RENDER_TEXT_H_