Make uneditable when readonly

views/controls/textfield/textfield.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 VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_
 #define VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_
 #pragma once
 
 #include "build/build_config.h"
 
@@ skipping 18 matching lines @@
 #include "views/controls/textfield/native_textfield_wrapper.h"
 #endif
 
 namespace views {
 
 class KeyEvent;
 class NativeTextfieldWrapper;
 
 // TextRange specifies the range of text in the Textfield.  This is
 // used to specify selected text and will be used to change the
-// attributes of characters in the textfield. The range preserves the
-// direction, and selecting from the end to the begining is considered
-// "reverse" order.
+// attributes of characters in the textfield. When this is used for
+// selection, the end is caret position, and the start is where
+// selection started.  The range preserves the direction, and
+// selecting from the end to the begining is considered "reverse"
+// order. (that is, start > end is reverse)
 class TextRange {
  public:
   TextRange() : start_(0), end_(0) {}
   TextRange(size_t start, size_t end);
 
   // Allow copy so that the omnibox can save the view state
   // for each tabs.
   explicit TextRange(const TextRange& range)
       : start_(range.start_), end_(range.end_) {}
 
@@ skipping 286 matching lines @@
 
   // Text to display when empty.
   string16 text_to_display_when_empty_;
 
   DISALLOW_COPY_AND_ASSIGN(Textfield);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_H_