diff --git a/include/nana/gui/widgets/combox.hpp b/include/nana/gui/widgets/combox.hpp
index 3d1698d0..b7e9286e 100644
--- a/include/nana/gui/widgets/combox.hpp
+++ b/include/nana/gui/widgets/combox.hpp
@@ -14,7 +14,7 @@
 #define NANA_GUI_WIDGETS_COMBOX_HPP
 #include "widget.hpp"
 #include "float_listbox.hpp"
-#include "skeletons/text_editor_scheme.hpp"
+#include "skeletons/text_editor_part.hpp"
 #include <nana/key_type.hpp>
 #include <nana/concepts.hpp>
 #include <functional>
diff --git a/include/nana/gui/widgets/skeletons/text_editor.hpp b/include/nana/gui/widgets/skeletons/text_editor.hpp
index 41812395..6f4c8fb9 100644
--- a/include/nana/gui/widgets/skeletons/text_editor.hpp
+++ b/include/nana/gui/widgets/skeletons/text_editor.hpp
@@ -14,7 +14,7 @@
 #ifndef NANA_GUI_SKELETONS_TEXT_EDITOR_HPP
 #define NANA_GUI_SKELETONS_TEXT_EDITOR_HPP
 #include "textbase.hpp"
-#include "text_editor_scheme.hpp"
+#include "text_editor_part.hpp"
 #include <nana/gui/widgets/scroll.hpp>
 #include <nana/unicode_bidi.hpp>
 
@@ -135,6 +135,8 @@ namespace nana{	namespace widgets
 			using size_type = textbase<char_type>::size_type;
 			using string_type = textbase<char_type>::string_type;
 
+			using event_interface = text_editor_event_interface;
+
 			using graph_reference = ::nana::paint::graphics&;
 
 			struct ext_renderer_tag
@@ -162,6 +164,9 @@ namespace nana{	namespace widgets
 
 			void typeface_changed();
 
+			void indent(bool, std::function<nana::string()> generator);
+			void set_event(event_interface*);
+
 			/// Determine whether the text_editor is line wrapped.
 			bool line_wrapped() const;
 			/// Set the text_editor whether it is line wrapped, it returns false if the state is not changed.
@@ -174,6 +179,10 @@ namespace nana{	namespace widgets
 			/// Sets the text area.
 			/// @return true if the area is changed with the new value.
 			bool text_area(const nana::rectangle&);
+
+			/// Returns the text area
+			rectangle text_area(bool including_scroll) const;
+
 			bool tip_string(nana::string&&);
 
 			const attributes & attr() const;
@@ -215,8 +224,13 @@ namespace nana{	namespace widgets
 			/// Returns width of text area excluding the vscroll size.
 			unsigned width_pixels() const;
 			window window_handle() const;
+
+			/// Returns text position of each line that currently displays on screen
+			const std::vector<upoint>& text_position() const;
+
+			void set_text_position_changed(std::function<void(const std::vector<upoint>&)>);
 		public:
-			void draw_scroll_rectangle();
+			void draw_corner();
 			void render(bool focused);
 		public:
 			void put(nana::string);
@@ -242,6 +256,8 @@ namespace nana{	namespace widgets
 
 			skeletons::textbase<nana::char_t>& textbase();
 			const skeletons::textbase<nana::char_t>& textbase() const;
+
+			std::vector<unsigned> get_lines() const;
 		private:
 			bool _m_accepts(char_type) const;
 			::nana::color _m_bgcolor() const;
@@ -294,7 +310,8 @@ namespace nana{	namespace widgets
 			undoable<command>	undo_;
 			nana::window window_;
 			graph_reference graph_;
-			const text_editor_scheme* scheme_;
+			const text_editor_scheme*	scheme_;
+			event_interface *			event_handler_{ nullptr };
 			std::unique_ptr<keywords> keywords_;
 
 			skeletons::textbase<nana::char_t> textbase_;
@@ -302,6 +319,15 @@ namespace nana{	namespace widgets
 
 			mutable ext_renderer_tag ext_renderer_;
 
+			std::vector<upoint> text_position_;	//position of text from last rendering.
+			std::function<void(const std::vector<upoint>&)> text_position_function_;
+
+			struct indent_rep
+			{
+				bool enabled{ false };
+				std::function<nana::string()> generator;
+			}indent_;
+
 			struct attributes
 			{
 				accepts acceptive{ accepts::no_restrict };
diff --git a/include/nana/gui/widgets/skeletons/text_editor_scheme.hpp b/include/nana/gui/widgets/skeletons/text_editor_part.hpp
similarity index 66%
rename from include/nana/gui/widgets/skeletons/text_editor_scheme.hpp
rename to include/nana/gui/widgets/skeletons/text_editor_part.hpp
index 00806b3b..9a213844 100644
--- a/include/nana/gui/widgets/skeletons/text_editor_scheme.hpp
+++ b/include/nana/gui/widgets/skeletons/text_editor_part.hpp
@@ -3,6 +3,7 @@
 #define NANA_WIDGETS_SKELETONS_TEXT_EDITOR_SCHEME_HPP
 
 #include "../../detail/widget_colors.hpp"
+#include <vector>
 
 namespace nana
 {
@@ -16,6 +17,14 @@ namespace nana
 				color_proxy selection{static_cast<color_rgb>(0x3399FF)};
 				color_proxy selection_text{colors::white};
 			};
+
+			class text_editor_event_interface
+			{
+			public:
+				virtual ~text_editor_event_interface() = default;
+
+				virtual void text_position_changed(const std::vector<upoint>&) = 0;
+			};
 		}
 	}
 }
diff --git a/include/nana/gui/widgets/spinbox.hpp b/include/nana/gui/widgets/spinbox.hpp
index 5e283872..dc081018 100644
--- a/include/nana/gui/widgets/spinbox.hpp
+++ b/include/nana/gui/widgets/spinbox.hpp
@@ -13,7 +13,7 @@
 #ifndef NANA_GUI_WIDGET_SPINBOX_HPP
 #define NANA_GUI_WIDGET_SPINBOX_HPP
 #include "widget.hpp"
-#include "skeletons/text_editor_scheme.hpp"
+#include "skeletons/text_editor_part.hpp"
 
 namespace nana
 {
diff --git a/include/nana/gui/widgets/textbox.hpp b/include/nana/gui/widgets/textbox.hpp
index f8759e05..bca29008 100644
--- a/include/nana/gui/widgets/textbox.hpp
+++ b/include/nana/gui/widgets/textbox.hpp
@@ -13,7 +13,7 @@
 #define NANA_GUI_WIDGET_TEXTBOX_HPP
 #include <nana/gui/widgets/widget.hpp>
 #include "skeletons/textbase_export_interface.hpp"
-#include "skeletons/text_editor_scheme.hpp"
+#include "skeletons/text_editor_part.hpp"
 
 namespace nana
 {
@@ -23,10 +23,20 @@ namespace nana
 		: public event_arg
 	{
 		textbox& widget;
+		const std::vector<upoint>* text_position;
 
 		arg_textbox(textbox&);
 	};
 
+	struct arg_textbox_text_position
+		: public event_arg
+	{
+		textbox& widget;
+		const std::vector<upoint>& text_position;
+
+		arg_textbox_text_position(textbox&, const std::vector<upoint>&);
+	};
+
 	namespace widgets
 	{
 		namespace skeletons
@@ -44,15 +54,30 @@ namespace nana
 			{
 				basic_event<arg_textbox> first_change;
 				basic_event<arg_textbox> text_changed;
+				basic_event<arg_textbox_text_position> text_position_changed;
+			};
+
+			class event_interface
+			{
+			public:
+				virtual ~event_interface() = default;
+
+				virtual void text_position_changed(const std::vector<upoint>&) = 0;
 			};
 
 			class event_agent
-				: public widgets::skeletons::textbase_event_agent_interface
+				:	public	widgets::skeletons::textbase_event_agent_interface,
+					public	widgets::skeletons::text_editor_event_interface 
 			{
 			public:
 				event_agent(::nana::textbox&);
+			private:
+				//Overrides textbase_event_agent_interface
 				void first_change() override;
 				void text_changed() override;
+			private:
+				//Overrides text_editor_event_interface
+				void text_position_changed(const std::vector<upoint>&) override;
 			private:
 				::nana::textbox & widget_;
 			};
@@ -128,8 +153,12 @@ namespace nana
 		void store(nana::string file);
 		void store(nana::string file, nana::unicode encoding);
 
+		/// Enables/disables the textbox to indent a line. Idents a new line when it is created by pressing enter.
+		/// @param generator generates text for identing a line. If it is empty, textbox indents the line according to last line.
+		void enable_indent(bool, std::function<nana::string()> generator = {});
+
 		//A workaround for reset, explicit default constructor syntax, because VC2013 incorrectly treats {} as {0}.
-		textbox& reset(nana::string = nana::string());      ///< discard the old text and set a newtext
+		textbox& reset(nana::string = nana::string());      ///< discard the old text and set a new text
 
 		/// The file of last store operation.
 		nana::string filename() const;
@@ -188,6 +217,16 @@ namespace nana
 		void set_keywords(const std::string& name, bool case_sensitive, bool whole_word_match, std::initializer_list<nana::string> kw_list);
 		void set_keywords(const std::string& name, bool case_sensitive, bool whole_word_match, std::initializer_list<std::string> kw_list_utf8);
 		void erase_keyword(const nana::string& kw);
+
+
+		/// Returns the text position of each line that currently displays on screen.
+		std::vector<upoint> text_position() const;
+
+		/// Returns the rectangle of text area
+		rectangle text_area() const;
+
+		/// Returns the height of line in pixels
+		unsigned line_pixels() const;
 	protected:
 		//Overrides widget's virtual functions
 		::nana::string _m_caption() const throw() override;
diff --git a/include/nana/gui/wvl.hpp b/include/nana/gui/wvl.hpp
index 4959e852..1f104bbd 100644
--- a/include/nana/gui/wvl.hpp
+++ b/include/nana/gui/wvl.hpp
@@ -20,6 +20,7 @@
 #include "widgets/form.hpp"
 #include "drawing.hpp"
 #include "msgbox.hpp"
+#include "place.hpp"
 
 namespace nana
 {
diff --git a/source/gui/widgets/skeletons/text_editor.cpp b/source/gui/widgets/skeletons/text_editor.cpp
index ff44e593..72c4fe22 100644
--- a/source/gui/widgets/skeletons/text_editor.cpp
+++ b/source/gui/widgets/skeletons/text_editor.cpp
@@ -252,7 +252,7 @@ namespace nana{	namespace widgets
 			virtual std::size_t take_lines(std::size_t pos) const = 0;
 
 			virtual void update_line(std::size_t textline, std::size_t secondary_before) = 0;
-			virtual void render(const ::nana::color& fgcolor) = 0;
+			virtual std::vector<::nana::upoint> render(const ::nana::color& fgcolor) = 0;
 			virtual	nana::point		caret_to_screen(upoint) = 0;
 			virtual nana::upoint	screen_to_caret(point scrpos) = 0;
 			virtual bool move_caret_ns(bool to_north) = 0;
@@ -290,8 +290,10 @@ namespace nana{	namespace widgets
 				editor_._m_draw_string(top, API::fgcolor(editor_.window_), nana::upoint(0, editor_.points_.caret.y), editor_.textbase_.getline(textline), true);
 			}
 
-			void render(const ::nana::color& fgcolor) override
+			std::vector<upoint> render(const ::nana::color& fgcolor) override
 			{
+				std::vector<upoint> line_index;
+
 				::nana::upoint str_pos(0, static_cast<unsigned>(editor_.points_.offset.y));
 
 				std::size_t scrlines = editor_.screen_lines() + str_pos.y;
@@ -304,9 +306,12 @@ namespace nana{	namespace widgets
 				while( str_pos.y < scrlines)
 				{
 					editor_._m_draw_string(top, fgcolor, str_pos, editor_.textbase_.getline(str_pos.y), true);
+					line_index.push_back(str_pos);
 					++str_pos.y;
 					top += pixels;
 				}
+
+				return line_index;
 			}
 
 			nana::point	caret_to_screen(nana::upoint pos) override
@@ -692,12 +697,14 @@ namespace nana{	namespace widgets
 					editor_.render(API::is_focus_ready(editor_.window_));
 			}
 
-			void render(const ::nana::color& fgcolor) override
+			std::vector<upoint> render(const ::nana::color& fgcolor) override
 			{
+				std::vector<upoint> line_index;
+
 				std::size_t secondary;
 				auto primary = _m_textline_from_screen(0, secondary);
 				if (primary >= linemtr_.size() || secondary >= linemtr_[primary].line_sections.size())
-					return;
+					return line_index;
 
 				nana::upoint str_pos(0, static_cast<unsigned>(primary));
 				str_pos.x = static_cast<unsigned>(linemtr_[primary].line_sections[secondary].begin - editor_.textbase_.getline(primary).data());
@@ -715,6 +722,7 @@ namespace nana{	namespace widgets
 
 						nana::string text(section.begin, section.end);
 						editor_._m_draw_string(top, fgcolor, str_pos, text, true);
+						line_index.push_back(str_pos);
 						++secondary;
 						if (secondary >= mtr.line_sections.size())
 						{
@@ -729,6 +737,8 @@ namespace nana{	namespace widgets
 					else
 						break;
 				}
+
+				return line_index;
 			}
 
 			nana::point	caret_to_screen(upoint pos) override
@@ -1436,6 +1446,17 @@ namespace nana{	namespace widgets
 			behavior_->pre_calc_lines(width_pixels());
 		}
 
+		void text_editor::indent(bool enb, std::function<nana::string()> generator)
+		{
+			indent_.enabled = enb;
+			indent_.generator.swap(generator);
+		}
+
+		void text_editor::set_event(event_interface* ptr)
+		{
+			event_handler_ = ptr;
+		}
+
 		bool text_editor::line_wrapped() const
 		{
 			return attributes_.line_wrapped;
@@ -1500,6 +1521,18 @@ namespace nana{	namespace widgets
 			return true;
 		}
 
+		rectangle text_editor::text_area(bool including_scroll) const
+		{
+			if (including_scroll)
+				return text_area_.area;
+
+			auto r = text_area_.area;
+
+			r.width = text_area_.area.width > text_area_.vscroll ? text_area_.area.width - text_area_.vscroll : 0;
+			r.height = text_area_.area.height > text_area_.hscroll ? text_area_.area.height - text_area_.hscroll : 0;
+			return r;
+		}
+
 		bool text_editor::tip_string(nana::string&& str)
 		{
 			if(attributes_.tip_string == str)
@@ -1873,7 +1906,17 @@ namespace nana{	namespace widgets
 			return window_;
 		}
 
-		void text_editor::draw_scroll_rectangle()
+		const std::vector<upoint>& text_editor::text_position() const
+		{
+			return text_position_;
+		}
+
+		void text_editor::set_text_position_changed(std::function<void(const std::vector<upoint>&)> fn)
+		{
+			text_position_function_.swap(fn);
+		}
+
+		void text_editor::draw_corner()
 		{
 			if(text_area_.vscroll && text_area_.hscroll)
 			{
@@ -1906,11 +1949,27 @@ namespace nana{	namespace widgets
 			//Render the content when the text isn't empty or the window has got focus,
 			//otherwise draw the tip string.
 			if ((false == textbase_.empty()) || has_focus)
-				behavior_->render(fgcolor);
-			else //Draw tip string
-				graph_.string({ text_area_.area.x - points_.offset.x, text_area_.area.y }, attributes_.tip_string, { 0x78, 0x78, 0x78 });
+			{
+				auto && text_pos = behavior_->render(fgcolor);
+				
 
-			draw_scroll_rectangle();
+				if (text_pos.empty())
+					text_pos.push_back({ 0, 0 });
+				
+				if (text_pos != text_position_)
+				{
+					text_position_.swap(text_pos);
+					if (event_handler_)
+						event_handler_->text_position_changed(text_position_);
+				}
+			}
+			else //Draw tip string
+				graph_.string({ text_area_.area.x - points_.offset.x, text_area_.area.y }, attributes_.tip_string, static_cast<color_rgb>(0x787878));
+
+			if (text_position_.empty())
+				text_position_.push_back({ 0, 0 });
+
+			draw_corner();
 
 			text_area_.border_renderer(graph_, bgcolor);
 		}
@@ -1961,7 +2020,7 @@ namespace nana{	namespace widgets
 			if (refresh || _m_update_caret_line(secondary_before))
 				render(true);
 			else
-				draw_scroll_rectangle();
+				draw_corner();
 
 			_m_scrollbar();
 
@@ -2049,6 +2108,29 @@ namespace nana{	namespace widgets
 				need_refresh = true;
 			}
 
+			if (indent_.enabled)
+			{
+				nana::string indent_text;
+				if (indent_.generator)
+				{
+					indent_text = indent_.generator();
+				}
+				else
+				{
+					auto & text = textbase_.getline(points_.caret.y - 1);
+					auto indent_pos = text.find_first_not_of(L"\t ");
+					if (indent_pos != std::wstring::npos)
+						indent_text = text.substr(0, indent_pos);
+					else
+						indent_text = text;
+				}
+
+				if (indent_text.size())
+					put(indent_text);
+				
+			}
+
+
 			if (behavior_->adjust_caret_into_screen() || need_refresh)
 				render(true);
 
@@ -2108,7 +2190,7 @@ namespace nana{	namespace widgets
 					if(_m_move_offset_x_while_over_border(-2) == false)
 					{
 						behavior_->update_line(points_.caret.y, secondary);
-						draw_scroll_rectangle();
+						draw_corner();
 						has_to_redraw = false;
 					}
 				}
diff --git a/source/gui/widgets/spinbox.cpp b/source/gui/widgets/spinbox.cpp
index e75b0031..a5fddd26 100644
--- a/source/gui/widgets/spinbox.cpp
+++ b/source/gui/widgets/spinbox.cpp
@@ -410,7 +410,7 @@ namespace nana
 				{
 					auto spins_r = _m_spins_area();
 					if (spins_r.x == 0)
-						editor_->text_area({});
+						editor_->text_area(rectangle{});
 					else
 						editor_->text_area({ 2, 2, graph_->width() - spins_r.width - 2, spins_r.height - 2 });
 				}
diff --git a/source/gui/widgets/textbox.cpp b/source/gui/widgets/textbox.cpp
index 59e51d57..40dd5c3a 100644
--- a/source/gui/widgets/textbox.cpp
+++ b/source/gui/widgets/textbox.cpp
@@ -24,6 +24,12 @@ namespace nana
 		: widget(wdg)
 	{}
 
+	arg_textbox_text_position::arg_textbox_text_position(textbox& wdg, const std::vector<upoint>& text_pos)
+		:	widget(wdg),
+			text_position(text_pos)
+	{
+	}
+
 namespace drawerbase {
 	namespace textbox
 	{
@@ -41,6 +47,12 @@ namespace drawerbase {
 			{
 				widget_.events().text_changed.emit(::nana::arg_textbox{ widget_ });
 			}
+
+			void event_agent::text_position_changed(const std::vector<upoint>& text_pos)
+			{
+				::nana::arg_textbox_text_position arg(widget_, text_pos);
+				widget_.events().text_position_changed.emit(arg);
+			}
 		//end class event_agent
 
 	//class draweer
@@ -69,6 +81,7 @@ namespace drawerbase {
 
 			editor_ = new text_editor(wd, graph, dynamic_cast<::nana::widgets::skeletons::text_editor_scheme*>(scheme));
 			editor_->textbase().set_event_agent(evt_agent_.get());
+			editor_->set_event(evt_agent_.get());
 
 			_m_text_area(graph.width(), graph.height());
 
@@ -240,6 +253,16 @@ namespace drawerbase {
 				editor->textbase().store(std::move(file), encoding);
 		}
 
+		/// Enables/disables the textbox to indent a line. Idents a new line when it is created by pressing enter.
+		/// @param generator generates text for identing a line. If it is empty, textbox indents the line according to last line.
+		void textbox::enable_indent(bool enb, std::function<nana::string()> generator)
+		{
+			internal_scope_guard lock;
+			auto editor = get_drawer_trigger().editor();
+			if (editor)
+				editor->indent(enb, generator);
+		}
+
 		textbox& textbox::reset(nana::string str)
 		{
 			internal_scope_guard lock;
@@ -495,6 +518,7 @@ namespace drawerbase {
 
 		void textbox::set_highlight(const std::string& name, const ::nana::color& fgcolor, const ::nana::color& bgcolor)
 		{
+			internal_scope_guard lock;
 			auto editor = get_drawer_trigger().editor();
 			if (editor)
 				editor->set_highlight(name, fgcolor, bgcolor);
@@ -502,6 +526,7 @@ namespace drawerbase {
 
 		void textbox::erase_highlight(const std::string& name)
 		{
+			internal_scope_guard lock;
 			auto editor = get_drawer_trigger().editor();
 			if (editor)
 				editor->erase_highlight(name);
@@ -509,6 +534,7 @@ namespace drawerbase {
 
 		void textbox::set_keywords(const std::string& name, bool case_sensitive, bool whole_word_match, std::initializer_list<nana::string> kw_list)
 		{
+			internal_scope_guard lock;
 			auto editor = get_drawer_trigger().editor();
 			if (editor)
 			{
@@ -519,6 +545,7 @@ namespace drawerbase {
 
 		void textbox::set_keywords(const std::string& name, bool case_sensitive, bool whole_word_match, std::initializer_list<std::string> kw_list_utf8)
 		{
+			internal_scope_guard lock;
 			auto editor = get_drawer_trigger().editor();
 			if (editor)
 			{
@@ -529,11 +556,39 @@ namespace drawerbase {
 
 		void textbox::erase_keyword(const nana::string& kw)
 		{
+			internal_scope_guard lock;
 			auto editor = get_drawer_trigger().editor();
 			if (editor)
 				editor->erase_keyword(kw);
 		}
 
+		std::vector<upoint> textbox::text_position() const
+		{
+			internal_scope_guard lock;
+			auto editor = get_drawer_trigger().editor();
+			if (editor)
+				return editor->text_position();
+			
+			return{};
+		}
+
+		rectangle textbox::text_area() const
+		{
+			internal_scope_guard lock;
+			auto editor = get_drawer_trigger().editor();
+			if (editor)
+				return editor->text_area(false);
+
+			return{};
+		}
+
+		unsigned textbox::line_pixels() const
+		{
+			internal_scope_guard lock;
+			auto editor = get_drawer_trigger().editor();
+			return (editor ? editor->line_height() : 0);
+		}
+
 		//Override _m_caption for caption()
 		nana::string textbox::_m_caption() const throw()
 		{