views: Moves TextfieldController/TextRange into their own headers.

views/controls/textfield/text_range.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_TEXT_RANGE_H_
+#define VIEWS_CONTROLS_TEXTFIELD_TEXT_RANGE_H_
+#pragma once
+
+#include <stddef.h>
+
+namespace views {
+
+// 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. 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 {

[sky, 2011/03/07 23:40:11]

All methods of this class are cheap. Inline it all.

[tfarina, 2011/03/08 00:02:46]

Ctors should not be in lined. I'd like to keep the others at the source file. It
makes this API nice and easy to read.

[sky, 2011/03/08 00:11:27]

See
http://dev.chromium.org/developers/coding-style/cpp-dos-and-donts#TOC-When-yo...
. 

+ public:
+  TextRange();
+  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);
+
+  // 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 the the selection range is same ignoring the direction.
+  bool EqualsIgnoringDirection(const TextRange& range) const;
+
+  // 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&);
+};
+
+}  // namespace views
+
+#endif  // VIEWS_CONTROLS_TEXTFIELD_TEXT_RANGE_H_