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>
+
+#include <algorithm>
+
+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 {
+ public:
+  TextRange() : start_(0), end_(0) {}
+  TextRange(size_t start, size_t end) : start_(start), end_(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 { return std::min(start_, end_); }
+
+  // Returns the max of selected range.
+  size_t GetMax() const { return std::max(start_, end_); }
+
+  // Returns true if the the selection range is same ignoring the direction.
+  bool EqualsIgnoringDirection(const TextRange& range) const {
+    return GetMin() == range.GetMin() && GetMax() == range.GetMax();
+  }
+
+  // Set the range with |start| and |end|.
+  void SetRange(size_t start, size_t end) {
+    start_ = start;
+    end_ = end;
+  }
+
+ private:
+  size_t start_;
+  size_t end_;
+};
+
+}  // namespace views
+
+#endif  // VIEWS_CONTROLS_TEXTFIELD_TEXT_RANGE_H_