Implement double/triple click functionality in views textfield.

views/controls/textfield/textfield_views_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 VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_
 #define VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_
 #pragma once
 
 #include <vector>
 
@@ skipping 105 matching lines @@
   // Returns the selected text.
   string16 GetSelectedText() const;
 
   void GetSelectedRange(TextRange* range) const;
 
   void SelectRange(const TextRange& range);
 
   // Selects all text.
   void SelectAll();
 
+  // Selects the word at which the cursor is currently positioned.
+  void SelectWord();
+
   // Clears selection.
   void ClearSelection();
 
   // Returns visible text. If the field is password, it returns the
   // sequence of "*".
   string16 GetVisibleText() const {
     return GetVisibleText(0U, text_.length());
   }
 
   // Cuts the currently selected text and puts it to clipboard. Returns true
@@ skipping 12 matching lines @@
 
  private:
   friend class NativeTextfieldViews;
 
   // Deletes the selected text.
   void DeleteSelection();
 
   // Returns the visible text given |start| and |end|.
   string16 GetVisibleText(size_t start, size_t end) const;
 
+  // Utility for SelectWord(). Checks whether position pos is at word boundary.
+  bool IsPositionAtWordSelectionBoundary(size_t pos);
+
   // Returns the normalized cursor position that does not exceed the
   // text length.
   size_t GetSafePosition(size_t position) const;
 
   // The text in utf16 format.
   string16 text_;
 
   // Current cursor position.
   size_t cursor_pos_;
 
   // Selection range.
   size_t selection_begin_;
 
   // True if the text is the password.
   bool is_password_;
 
   DISALLOW_COPY_AND_ASSIGN(TextfieldViewsModel);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_TEXTFIELD_TEXTFIELD_VIEWS_MODEL_H_