diff --git a/include/nana/deploy.hpp b/include/nana/deploy.hpp
index 686bb4ce..c9d12f88 100644
--- a/include/nana/deploy.hpp
+++ b/include/nana/deploy.hpp
@@ -1,7 +1,7 @@
 /*
  *	The Deploy Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2017 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -23,6 +23,10 @@
 
 #include <stdexcept>
 
+#ifdef _nana_std_has_string_view
+#include <string_view>
+#endif
+
 namespace nana
 {
 	/// move to *.h ??
@@ -44,10 +48,15 @@ namespace nana
 
 	
 	/// Checks whether a specified text is utf8 encoding
+#ifdef _nana_std_has_string_view
+	bool is_utf8(std::string_view str);
+	void throw_not_utf8(std::string_view str);
+#else
 	bool is_utf8(const char* str, std::size_t len);
 	void throw_not_utf8(const std::string& text);
 	void throw_not_utf8(const char*, std::size_t len);
 	void throw_not_utf8(const char*);
+#endif
 
 	/// this text needed change, it needed review ??
 	bool review_utf8(const std::string& text);
@@ -58,7 +67,12 @@ namespace nana
 	const std::string& to_utf8(const std::string&);
 	std::string to_utf8(const std::wstring&);
 
+#ifdef _nana_std_has_string_view
+	std::wstring to_wstring(std::string_view utf8_str);
+#else
 	std::wstring to_wstring(const std::string& utf8_str);
+#endif
+
 	const std::wstring& to_wstring(const std::wstring& wstr);
 	std::wstring&& to_wstring(std::wstring&& wstr);
 
diff --git a/include/nana/paint/detail/native_paint_interface.hpp b/include/nana/paint/detail/native_paint_interface.hpp
index 844427a5..a6cc4534 100644
--- a/include/nana/paint/detail/native_paint_interface.hpp
+++ b/include/nana/paint/detail/native_paint_interface.hpp
@@ -1,6 +1,6 @@
 /*
  *	Platform Implementation
- *	Copyright(C) 2003-2013 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2003-2018 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0. 
  *	(See accompanying file LICENSE_1_0.txt or copy at 
@@ -32,8 +32,11 @@ namespace detail
 	//dw color = dw color * fade_rate + bdcolor * (1 - fade_rate)
 	void blend(drawable_type dw, const nana::rectangle& r, pixel_color_t bdcolor, double fade_rate);
 
-	nana::size raw_text_extent_size(drawable_type, const wchar_t*, std::size_t len);
+	nana::size real_text_extent_size(drawable_type, const char*, std::size_t len);
+	nana::size real_text_extent_size(drawable_type, const wchar_t*, std::size_t len);
+	nana::size text_extent_size(drawable_type, const char*, std::size_t len);
 	nana::size text_extent_size(drawable_type, const wchar_t*, std::size_t len);
+
 	void draw_string(drawable_type, const nana::point&, const wchar_t *, std::size_t len);
 }//end namespace detail
 }//end namespace paint
diff --git a/include/nana/paint/graphics.hpp b/include/nana/paint/graphics.hpp
index f3b33aa5..bea13f4b 100644
--- a/include/nana/paint/graphics.hpp
+++ b/include/nana/paint/graphics.hpp
@@ -21,6 +21,10 @@
 
 #include "detail/ptdefs.hpp"
 
+#ifdef _nana_std_has_string_view
+#include <string_view>
+#endif
+
 namespace nana
 {
 	namespace paint
@@ -108,12 +112,20 @@ namespace nana
 			void resize(const ::nana::size&);
 			void typeface(const font&);						///< Selects a specified font type into the graphics object.
 			font typeface() const;
+
+#ifdef _nana_std_has_string_view
+			::nana::size text_extent_size(std::string_view text) const;
+			::nana::size text_extent_size(std::wstring_view text) const;
+#else
 			::nana::size	text_extent_size(const ::std::string&) const;
 			::nana::size	text_extent_size(const char*, std::size_t len) const;
+
 			::nana::size	text_extent_size(const wchar_t*) const;    ///< Computes the width and height of the specified string of text.
 			::nana::size	text_extent_size(const ::std::wstring&) const;    ///< Computes the width and height of the specified string of text.
 			::nana::size	text_extent_size(const wchar_t*, std::size_t length) const;    ///< Computes the width and height of the specified string of text with the specified length.
 			::nana::size	text_extent_size(const ::std::wstring&, std::size_t length) const;    ///< Computes the width and height of the specified string of text with the specified length.
+#endif
+
 			::nana::size	glyph_extent_size(const wchar_t*, std::size_t length, std::size_t begin, std::size_t end) const;
 			::nana::size	glyph_extent_size(const ::std::wstring&, std::size_t length, std::size_t begin, std::size_t end) const;
 			bool glyph_pixels(const wchar_t *, std::size_t length, unsigned* pxbuf) const;
diff --git a/source/deploy.cpp b/source/deploy.cpp
index a5050e77..06bbda02 100644
--- a/source/deploy.cpp
+++ b/source/deploy.cpp
@@ -28,6 +28,42 @@
 
 namespace nana
 {
+#ifdef _nana_std_has_string_view
+	bool is_utf8(std::string_view str)
+	{
+		auto ustr = reinterpret_cast<const unsigned char*>(str.data());
+		auto end = ustr + str.size();
+
+		while (ustr < end)
+		{
+			const auto uv = *ustr;
+			if (uv < 0x80)
+			{
+				++ustr;
+				continue;
+			}
+
+			if (uv < 0xC0)
+				return false;
+
+			if ((uv < 0xE0) && (end - ustr > 1))
+				ustr += 2;
+			else if ((uv < 0xF0) && (end - ustr > 2))
+				ustr += 3;
+			else if ((uv < 0x1F) && (end - ustr > 3))
+				ustr += 4;
+			else
+				return false;
+		}
+		return true;
+	}
+
+	void throw_not_utf8(std::string_view str)
+	{
+		if (!is_utf8(str))
+			return utf8_Error(std::string("\nThe text is not encoded in UTF8: ") + std::string(str.data(), str.size())).emit();
+	}
+#else
 	bool is_utf8(const char* str, std::size_t len)
 	{
 		auto ustr = reinterpret_cast<const unsigned char*>(str);
@@ -57,6 +93,23 @@ namespace nana
 		return true;
 	}
 
+	void throw_not_utf8(const std::string& text)
+	{
+		throw_not_utf8(text.c_str(), text.size());
+	}
+
+	void throw_not_utf8(const char* text)
+	{
+		throw_not_utf8(text, std::strlen(text));
+	}
+
+	void throw_not_utf8(const char* text, std::size_t len)
+	{
+		if (!is_utf8(text, len))
+			return utf8_Error(std::string("\nThe text is not encoded in UTF8: ") + std::string(text, len)).emit();
+	}
+#endif
+
 	//class utf8_Error
 
 #if defined(_MSC_VER)
@@ -79,22 +132,6 @@ namespace nana
 	bool utf8_Error::use_throw{ false };
 	//end class utf8_Error
 
-	void throw_not_utf8(const std::string& text)
-	{
-		throw_not_utf8(text.c_str(), text.size());
-	}
-
-	void throw_not_utf8(const char* text)
-	{
-		throw_not_utf8(text, std::strlen(text));
-	}
-
-	void throw_not_utf8(const char* text, std::size_t len)
-	{
-		if (!is_utf8(text, len))
-			return utf8_Error(std::string("\nThe text is not encoded in UTF8: ") + std::string(text, len) ).emit();
-	}
-
 	std::string recode_to_utf8(std::string no_utf8)
 	{
 		return nana::charset(std::move(no_utf8)).to_bytes(nana::unicode::utf8);
@@ -103,7 +140,11 @@ namespace nana
 	/// this text needed change, it needed review ??
 	bool review_utf8(const std::string& text)
 	{
+#ifdef _nana_std_has_string_view
+		if (!is_utf8(text))
+#else
 		if (!is_utf8(text.c_str(), text.length()))
+#endif
 		{
 			utf8_Error(std::string("\nThe const text is not encoded in UTF8: ") + text).emit();
 			return true;   /// it needed change, it needed review !!
@@ -115,7 +156,11 @@ namespace nana
 	/// this text needed change, it needed review ??
 	bool review_utf8(std::string& text)
 	{
+#ifdef _nana_std_has_string_view
+		if(!is_utf8(text))
+#else
 		if (!is_utf8(text.c_str(), text.length()))
+#endif
 		{
 			utf8_Error(std::string("\nThe text is not encoded in UTF8: ") + text).emit();
 			text=recode_to_utf8(text);
@@ -135,10 +180,21 @@ namespace nana
 		return ::nana::charset(text).to_bytes(::nana::unicode::utf8);
 	}
 
+#ifdef _nana_std_has_string_view
+	std::wstring to_wstring(std::string_view utf8_str)
+	{
+		if (utf8_str.empty())
+			return{};
+
+		return ::nana::charset(std::string{ utf8_str.data(), utf8_str.size() }, unicode::utf8);
+	}
+#else
 	std::wstring to_wstring(const std::string& utf8_str)
 	{
 		return ::nana::charset(utf8_str, ::nana::unicode::utf8);
 	}
+#endif
+
 
 	const std::wstring& to_wstring(const std::wstring& wstr)
 	{
diff --git a/source/gui/programming_interface.cpp b/source/gui/programming_interface.cpp
index ed81cef7..374b4250 100644
--- a/source/gui/programming_interface.cpp
+++ b/source/gui/programming_interface.cpp
@@ -393,8 +393,13 @@ namespace API
 		{
 			if (shortkey)
 			{
+#ifdef _nana_std_has_string_view
+				auto off_x = (shortkey_position ? graph.text_extent_size(std::string_view{ text.c_str(), shortkey_position }).width : 0);
+				auto key_px = static_cast<int>(graph.text_extent_size(std::wstring_view{ &shortkey, 1 }).width);
+#else
 				auto off_x = (shortkey_position ? graph.text_extent_size(text.c_str(), shortkey_position).width : 0);
 				auto key_px = static_cast<int>(graph.text_extent_size(&shortkey, 1).width);
+#endif
 
 				unsigned ascent, descent, inleading;
 				graph.text_metrics(ascent, descent, inleading);
diff --git a/source/gui/widgets/checkbox.cpp b/source/gui/widgets/checkbox.cpp
index 7fc20469..66fb22de 100644
--- a/source/gui/widgets/checkbox.cpp
+++ b/source/gui/widgets/checkbox.cpp
@@ -78,7 +78,11 @@ namespace nana{ namespace drawerbase
 				}
 
 				//draw crook
+#ifdef _nana_std_has_string_view
+				auto txt_px = graph.text_extent_size(std::wstring_view( L"jN", 2 )).height + 2;
+#else
 				auto txt_px = graph.text_extent_size(L"jN", 2).height + 2;
+#endif
 				impl_->crook.draw(graph, wdg->bgcolor(), wdg->fgcolor(), rectangle(0, txt_px > 16 ? (txt_px - 16) / 2 : 0, 16, 16), API::element_state(*wdg));
 			}
 
diff --git a/source/gui/widgets/label.cpp b/source/gui/widgets/label.cpp
index bf670c12..8168984e 100644
--- a/source/gui/widgets/label.cpp
+++ b/source/gui/widgets/label.cpp
@@ -83,7 +83,11 @@ namespace nana
 
 					auto pre_font = graph.typeface();	//used for restoring the font
 
+#ifdef _nana_std_has_string_view
+					const unsigned def_line_pixels = graph.text_extent_size(std::wstring_view{ L" ", 1 }).height;
+#else
 					const unsigned def_line_pixels = graph.text_extent_size(L" ", 1).height;
+#endif
 
 					font_ = pre_font;
 					fblock_ = nullptr;
@@ -170,7 +174,11 @@ namespace nana
 
 					auto ft = graph.typeface();	//used for restoring the font
 
+#ifdef _nana_std_has_string_view
+					const unsigned def_line_pixels = graph.text_extent_size(std::wstring_view(L" ", 1)).height;
+#else
 					const unsigned def_line_pixels = graph.text_extent_size(L" ", 1).height;
+#endif
 
 					font_ = ft;
 					fblock_ = nullptr;
diff --git a/source/gui/widgets/skeletons/text_editor.cpp b/source/gui/widgets/skeletons/text_editor.cpp
index 38a4666f..9dc06848 100644
--- a/source/gui/widgets/skeletons/text_editor.cpp
+++ b/source/gui/widgets/skeletons/text_editor.cpp
@@ -3147,7 +3147,11 @@ namespace nana{	namespace widgets
 				maskstr.append(n, mask_char_);
 				return graph_.text_extent_size(maskstr);
 			}
+#ifdef _nana_std_has_string_view
+			return graph_.text_extent_size(std::basic_string_view<char_type>(str, n));
+#else
 			return graph_.text_extent_size(str, static_cast<unsigned>(n));
+#endif
 		}
 
 		bool text_editor::_m_adjust_view()
@@ -3500,7 +3504,12 @@ namespace nana{	namespace widgets
 				for (auto & ent : reordered)
 				{
 					std::size_t len = ent.end - ent.begin;
+
+#ifdef _nana_std_has_string_view
+					unsigned str_w = graph_.text_extent_size(std::wstring_view{ ent.begin, len }).width;
+#else
 					unsigned str_w = graph_.text_extent_size(ent.begin, len).width;
+#endif
 
 					if ((text_draw_pos.x + static_cast<int>(str_w) > text_area_.area.x) && (text_draw_pos.x < text_right))
 					{
@@ -3519,7 +3528,11 @@ namespace nana{	namespace widgets
 				for (auto & ent : reordered)
 				{
 					const auto len = ent.end - ent.begin;
+#ifdef _nana_std_has_string_view
+					auto ent_px = graph_.text_extent_size(std::wstring_view(ent.begin, len)).width;
+#else
 					auto ent_px = graph_.text_extent_size(ent.begin, len).width;
+#endif
 
 					extra_space = false;
 
@@ -3589,7 +3602,11 @@ namespace nana{	namespace widgets
 				auto pos = text_coord.x + text_len;
 				if (b.x != pos || text_coord.y != b.y)
 				{
+#ifdef _nana_std_has_string_view
+					auto whitespace_w = graph_.text_extent_size(std::wstring_view{ L" ", 1 }).width;
+#else
 					auto whitespace_w = graph_.text_extent_size(L" ", 1).width;
+#endif
 					graph_.rectangle(::nana::rectangle{ text_draw_pos, { whitespace_w, line_h_pixels } }, true);
 				}
 			}
diff --git a/source/gui/widgets/treebox.cpp b/source/gui/widgets/treebox.cpp
index 19873e27..c68abb4c 100644
--- a/source/gui/widgets/treebox.cpp
+++ b/source/gui/widgets/treebox.cpp
@@ -1163,7 +1163,11 @@ namespace nana
 
 				virtual unsigned item_height(graph_reference graph) const override
 				{
+#ifdef _nana_std_has_string_view
+					return graph.text_extent_size(std::wstring_view{ L"jH{", 3 }).height + 8;
+#else
 					return graph.text_extent_size(L"jH{", 3).height + 8;
+#endif
 				}
 
 				virtual unsigned item_width(graph_reference graph, const item_attribute_t& attr) const override
diff --git a/source/paint/detail/native_paint_interface.cpp b/source/paint/detail/native_paint_interface.cpp
index 6efb8169..7703747c 100644
--- a/source/paint/detail/native_paint_interface.cpp
+++ b/source/paint/detail/native_paint_interface.cpp
@@ -134,29 +134,80 @@ namespace detail
 		pixbuf.paste(nana::rectangle(r.x, 0, r.width, r.height), dw, point{r.x, r.y});
 	}
 
-	nana::size raw_text_extent_size(drawable_type dw, const wchar_t* text, std::size_t len)
+	nana::size real_text_extent_size(drawable_type dw, const wchar_t* text, std::size_t len)
 	{
-		if(nullptr == dw || nullptr == text || 0 == len) return nana::size();
+		if (dw && text && len)
+		{
+
 #if defined(NANA_WINDOWS)
-		::SIZE size;
-		if(::GetTextExtentPoint32(dw->context, text, static_cast<int>(len), &size))
-			return nana::size(size.cx, size.cy);
+			::SIZE size;
+			if (::GetTextExtentPoint32(dw->context, text, static_cast<int>(len), &size))
+				return nana::size(size.cx, size.cy);
 #elif defined(NANA_X11)
-	#if defined(NANA_USE_XFT)
-		std::string utf8str = to_utf8(std::wstring(text, len));
-		XGlyphInfo ext;
-		XftFont * fs = reinterpret_cast<XftFont*>(dw->font->native_handle());
-		::XftTextExtentsUtf8(nana::detail::platform_spec::instance().open_display(), fs,
-								reinterpret_cast<XftChar8*>(const_cast<char*>(utf8str.c_str())), utf8str.size(), &ext);
-		return nana::size(ext.xOff, fs->ascent + fs->descent);
-	#else
-		XRectangle ink;
-		XRectangle logic;
-		::XmbTextExtents(reinterpret_cast<XFontSet>(dw->font->native_handle()), text, len, &ink, &logic);
-		return nana::size(logic.width, logic.height);
-	#endif
+			std::string utf8str = to_utf8(std::wstring(text, len));
+#if defined(NANA_USE_XFT)
+			XGlyphInfo ext;
+			XftFont * fs = reinterpret_cast<XftFont*>(dw->font->native_handle());
+			::XftTextExtentsUtf8(nana::detail::platform_spec::instance().open_display(), fs,
+				reinterpret_cast<XftChar8*>(const_cast<char*>(utf8text.data())), utf8text.size(), &ext);
+			return nana::size(ext.xOff, fs->ascent + fs->descent);
+#else
+			XRectangle ink;
+			XRectangle logic;
+			::XmbTextExtents(reinterpret_cast<XFontSet>(dw->font->native_handle()), utf8str.c_str(), utf8str.size(), &ink, &logic);
+			return nana::size(logic.width, logic.height);
 #endif
-		return nana::size();
+#endif
+		}
+		return {};
+	}
+
+	nana::size real_text_extent_size(drawable_type dw, const char* text, std::size_t len)
+	{
+		if (dw && text && len)
+		{
+
+#if defined(NANA_WINDOWS)
+			auto wstr = to_wstring(std::string(text,len));
+			::SIZE size;
+			if (::GetTextExtentPoint32(dw->context, wstr.c_str(), static_cast<int>(wstr.size()), &size))
+				return nana::size(size.cx, size.cy);
+#elif defined(NANA_X11)
+#if defined(NANA_USE_XFT)
+			XGlyphInfo ext;
+			XftFont * fs = reinterpret_cast<XftFont*>(dw->font->native_handle());
+			::XftTextExtentsUtf8(nana::detail::platform_spec::instance().open_display(), fs,
+				reinterpret_cast<XftChar8*>(const_cast<char*>(text)), len, &ext);
+			return nana::size(ext.xOff, fs->ascent + fs->descent);
+#else
+			XRectangle ink;
+			XRectangle logic;
+			::XmbTextExtents(reinterpret_cast<XFontSet>(dw->font->native_handle()), text, len, &ink, &logic);
+			return nana::size(logic.width, logic.height);
+#endif
+#endif
+		}
+		return {};
+	}
+
+
+	nana::size text_extent_size(drawable_type dw, const char * text, std::size_t len)
+	{
+		if (nullptr == dw || nullptr == text || 0 == len)
+			return{};
+
+		nana::size extents = real_text_extent_size(dw, text, len);
+
+		auto const end = text + len;
+		int tabs = 0;
+		for (; text != end; ++text)
+		{
+			if (*text == '\t')
+				++tabs;
+		}
+		if (tabs)
+			extents.width = static_cast<int>(extents.width) - tabs * static_cast<int>(dw->string.tab_pixels - dw->string.whitespace_pixels * dw->string.tab_length);
+		return extents;
 	}
 
 	nana::size text_extent_size(drawable_type dw, const wchar_t * text, std::size_t len)
@@ -164,7 +215,7 @@ namespace detail
 		if (nullptr == dw || nullptr == text || 0 == len)
 			return{};
 
-		nana::size extents = raw_text_extent_size(dw, text, len);
+		nana::size extents = real_text_extent_size(dw, text, len);
 
 		const wchar_t* const end = text + len;
 		int tabs = 0;
diff --git a/source/paint/graphics.cpp b/source/paint/graphics.cpp
index 2d92b435..46b685d1 100644
--- a/source/paint/graphics.cpp
+++ b/source/paint/graphics.cpp
@@ -411,8 +411,8 @@ namespace paint
 					impl_->handle = dw.get();
 					impl_->size = sz;
 
-					impl_->handle->string.tab_pixels = detail::raw_text_extent_size(impl_->handle, L"\t", 1).width;
-					impl_->handle->string.whitespace_pixels = detail::raw_text_extent_size(impl_->handle, L" ", 1).width;
+					impl_->handle->string.tab_pixels = detail::real_text_extent_size(impl_->handle, L"\t", 1).width;
+					impl_->handle->string.whitespace_pixels = detail::real_text_extent_size(impl_->handle, L" ", 1).width;
 				}
 			}
 
@@ -438,8 +438,9 @@ namespace paint
 #if defined(NANA_WINDOWS)
 				::SelectObject(impl_->handle->context, reinterpret_cast<HFONT>(f.impl_->real_font->native_handle()));
 #endif
-				impl_->handle->string.tab_pixels = detail::raw_text_extent_size(impl_->handle, L"\t", 1).width;
-				impl_->handle->string.whitespace_pixels = detail::raw_text_extent_size(impl_->handle, L" ", 1).width;
+
+				impl_->handle->string.tab_pixels = detail::real_text_extent_size(impl_->handle, L"\t", 1).width;
+				impl_->handle->string.whitespace_pixels = detail::real_text_extent_size(impl_->handle, L" ", 1).width;
 
 				if (impl_->changed == false)
 					impl_->changed = true;
@@ -453,6 +454,20 @@ namespace paint
 			return (impl_->handle ? font(impl_->handle) : impl_->font_shadow);
 		}
 
+#ifdef _nana_std_has_string_view
+		size graphics::text_extent_size(std::string_view text) const
+		{
+			throw_not_utf8(text);
+			return detail::text_extent_size(impl_->handle, text.data(), text.length());
+		}
+
+		size graphics::text_extent_size(std::wstring_view text) const
+		{
+			return detail::text_extent_size(impl_->handle, text.data(), text.length());
+		}
+
+		
+#else
 		::nana::size graphics::text_extent_size(const ::std::string& text) const
 		{
 			throw_not_utf8(text);
@@ -483,6 +498,7 @@ namespace paint
 		{
 			return detail::text_extent_size(impl_->handle, str.c_str(), len);
 		}
+#endif
 
 		nana::size graphics::glyph_extent_size(const wchar_t * str, std::size_t len, std::size_t begin, std::size_t end) const
 		{
@@ -562,7 +578,11 @@ namespace paint
 				auto const reordered = unicode_reorder(str.c_str(), str.size());
 				for(auto & i: reordered)
 				{
+#ifdef _nana_std_has_string_view
+					nana::size t = text_extent_size(std::wstring_view( i.begin, i.end - i.begin ));
+#else
 					nana::size t = text_extent_size(i.begin, i.end - i.begin);
+#endif
 					sz.width += t.width;
 					if(sz.height < t.height)
 						sz.height = t.height;
@@ -1011,7 +1031,11 @@ namespace paint
 			for (auto & i : reordered)
 			{
 				string(moved_pos, i.begin, i.end - i.begin);
+#ifdef _nana_std_has_string_view
+				moved_pos.x += static_cast<int>(text_extent_size(std::wstring_view( i.begin, i.end - i.begin )).width);
+#else
 				moved_pos.x += static_cast<int>(text_extent_size(i.begin, i.end - i.begin).width);
+#endif
 			}
 			return static_cast<unsigned>(moved_pos.x - pos.x);
 		}
@@ -1076,7 +1100,7 @@ namespace paint
 						{
 							//Render a part that does not contains a tab
 							detail::draw_string(impl_->handle, pos, str, len);
-							pos.x += detail::raw_text_extent_size(impl_->handle, str, len).width;
+							pos.x += detail::real_text_extent_size(impl_->handle, str, len).width;
 						}
 
 						str = i;
diff --git a/source/paint/text_renderer.cpp b/source/paint/text_renderer.cpp
index 07b71e0f..b2848c2f 100644
--- a/source/paint/text_renderer.cpp
+++ b/source/paint/text_renderer.cpp
@@ -52,6 +52,7 @@ namespace nana
 						{
 							std::size_t len = ent.end - ent.begin;
 							nana::size ts = detail::text_extent_size(dw, ent.begin, len);
+
 							if(ts.height > pixels)	pixels = ts.height;
 						
 							if(pos.x + static_cast<int>(ts.width) > 0)
@@ -128,7 +129,11 @@ namespace nana
 				draw_string_omitted(graphics& graph, int x, int endpos, bool omitted)
 					: graph(graph), x(x), endpos(endpos)
 				{
+#ifdef _nana_std_has_string_view
+					omitted_pixels = (omitted ? graph.text_extent_size(std::string_view{ "...", 3 }).width : 0);
+#else
 					omitted_pixels = (omitted ? graph.text_extent_size("...", 3).width : 0);
+#endif
 					if (endpos - x > static_cast<int>(omitted_pixels))
 						this->endpos -= omitted_pixels;
 					else
@@ -629,7 +634,11 @@ namespace nana
 				return;
 			}
 
+#ifdef _nana_std_has_string_view
+			const auto ellipsis = graph_.text_extent_size(std::string_view{ "...", 3 }).width;
+#else
 			const auto ellipsis = graph_.text_extent_size("...", 3).width;
+#endif
 
 			std::unique_ptr<unsigned[]> pixels(new unsigned[text.size()]);
 			graph_.glyph_pixels(text.c_str(), text.size(), pixels.get());