add a method to textbox

a method to get bounds of a text selection

include/nana/gui/widgets/skeletons/text_editor.hpp

@@ -151,6 +151,8 @@ namespace nana{	namespace widgets
 
 			bool selected() const;
 			bool select(bool);
+			bool get_select_points(nana::upoint&, nana::upoint&) const;
+
 			/// Sets the end position of a selected string.
 			void set_end_caret();
 			
@@ -233,7 +235,6 @@ namespace nana{	namespace widgets
 			//@brief: redraw whole line specified by caret pos. 
 			//@return: true if caret overs the border
 			bool _m_update_caret_line(std::size_t secondary_before);
-			bool _m_get_sort_select_points(nana::upoint&, nana::upoint&) const;
 
 			void _m_offset_y(int y);
 

include/nana/gui/widgets/textbox.hpp

@@ -184,7 +184,7 @@ namespace nana
 		bool editable() const;
 		textbox& editable(bool);
 
-		/// Enables the caret if the textbox current is not editable
+		/// Enables the caret if the textbox currently is not editable
 		textbox& enable_caret();
 
 		void set_accept(std::function<bool(wchar_t)>);
@@ -200,6 +200,12 @@ namespace nana
         /// Selects/unselects all text.
 		void select(bool);
 
+		/// Returns the bounds of a text selection
+		/**
+		 * @return no selection if pair.first == pair.second.
+		 */
+		std::pair<upoint, upoint> selection() const;
+
 		void copy() const;  ///< Copies the selected text into shared memory, such as clipboard under Windows.
 		void paste();       ///< Pastes the text from shared memory.
 		void del();