Add TextRange and related methods to Textfield Views.

views/controls/textfield/textfield.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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"
 
 #if defined(OS_LINUX)
@@ skipping 13 matching lines @@
 #include "base/logging.h"
 #endif
 #ifdef UNIT_TEST
 #include "gfx/native_widget_types.h"
 #include "views/controls/textfield/native_textfield_wrapper.h"
 #endif
 
 namespace views {
 
 class KeyEvent;
+class NativeTextfieldWrapper;
 
-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.
+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_) {}
+
+  // Returns the start position;
+  size_t start() const { return start_; }
+
+  // Returns the end position.
+  size_t end() const { return end_; }
+
+  // Returns true if the selected text is empty.
+  bool is_empty() const { return start_ == end_; }
+
+  // Returns true if the selection is made in reverse order.
+  bool is_reverse() const { return start_ > end_; }
+
+  // Returns the min of selected range.
+  size_t GetMin() const;
+
+  // Returns the max of selected range.
+  size_t GetMax() const;
+
+  // Returns true if |range| has same start, end position.
+  bool Equals(const TextRange& range) const {
+    return start_ == range.start_ && end_ == range.end_;
+  }
+
+  // Set the range with |start| and |end|.
+  void SetRange(size_t start, size_t end);
+
+ private:
+  size_t start_;
+  size_t end_;
+
+  // No assign.
+  void operator=(const TextRange&);
+};
 
 // This class implements a ChromeView that wraps a native text (edit) field.
 class Textfield : public View {
  public:
   // The button's class name.
   static const char kViewClassName[];
 
   // This defines the callback interface for other code to be notified of
   // changes in the state of a text field.
   class Controller {
@@ skipping 131 matching lines @@
 
   // Invoked by the edit control when the value changes. This method set
   // the text_ member variable to the value contained in edit control.
   // This is important because the edit control can be replaced if it has
   // been deleted during a window close.
   void SyncText();
 
   // Returns whether or not an IME is composing text.
   bool IsIMEComposing() const;
 
+  // Gets the selected range. This is views-implementation only and
+  // has to be called after the wrapper is created.
+  void GetSelectedRange(TextRange* range) const;
+
+  // Selects the text given by |range|. This is views-implementation only and
+  // has to be called after the wrapper is created.
+  void SelectRange(const TextRange& range);
+
+  // Returns the current cursor position. This is views-implementation
+  // only and has to be called after the wrapper is created.
+  size_t GetCursorPosition() const;
+
 #ifdef UNIT_TEST
   gfx::NativeView GetTestingHandle() const {
     return native_wrapper_ ? native_wrapper_->GetTestingHandle() : NULL;
   }
   NativeTextfieldWrapper* native_wrapper() const {
     return native_wrapper_;
   }
 #endif
 
   // Overridden from View:
@@ skipping 80 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_