Merge remote-tracking branch 'cnjinhao/develop-1.7' into cmake-dev

include/nana/c++defines.hpp

@@ -211,10 +211,10 @@
 
 
 #undef _nana_std_optional
-#if ((defined(_MSC_VER) && (_MSC_VER >= 1912) && ((!defined(_MSVC_LANG)) || _MSVC_LANG < 201703))) ||	\
+#if ((defined(_MSC_VER) && ((!defined(_MSVC_LANG)) || _MSVC_LANG < 201703))) ||	\
-	((__cplusplus < 201703L) || \
+	((!defined(_MSC_VER)) && ((__cplusplus < 201703L) || \
 		(defined(__clang__) && (__clang_major__ * 100 + __clang_minor__ < 400)) ||				\
-		(!defined(__clang__) && defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 701))	\
+		(!defined(__clang__) && defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 701)))	\
 	)
 #	define _nana_std_optional
 #endif

include/nana/gui/animation.hpp

@@ -1,7 +1,7 @@
 /*
  *	An Animation Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2015 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
@@ -49,24 +49,18 @@ namespace nana
 		
 		struct impl;
 		class performance_manager;
+
+		/// Non-copyable
+		animation(const animation&) = delete;
+		animation& operator=(const animation&) = delete;
 	public:
 		animation(std::size_t fps = 23);
 		~animation();
 
-		void push_back(frameset frms);
+		animation(animation&&);
-		/*
+		animation& operator=(animation&&);
-		void branch(const std::string& name, const frameset& frms)
-		{
-			impl_->branches[name].frames = frms;
-		}
 
-		void branch(const std::string& name, const frameset& frms, std::function<std::size_t(const std::string&, std::size_t, std::size_t&)> condition)
+		void push_back(frameset frms);
-		{
-			auto & br = impl_->branches[name];
-			br.frames = frms;
-			br.condition = condition;
-		}
-		*/
 
 		void looped(bool enable);       ///< Enables or disables the animation repeating playback.
 

include/nana/gui/widgets/menubar.hpp

@@ -1,7 +1,7 @@
 /*
  *	A Menubar implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2009-2017 Jinhao(cnjinhao@hotmail.com)
+ *	Copyright(C) 2009-2018 Jinhao(cnjinhao@hotmail.com)
  *
  *	Distributed under the Boost Software License, Version 1.0.
  *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -34,26 +34,6 @@ namespace nana
 				color_proxy border_highlight{ colors::highlight };
 			};
 
-			class item_renderer
-			{
-			public:
-				enum class state
-				{
-					normal, highlighted, selected
-				};
-
-				using graph_reference = paint::graphics&;
-				using scheme = ::nana::drawerbase::menubar::scheme;
-
-				item_renderer(window, graph_reference);
-				virtual void background(const point&, const ::nana::size&, state);
-				virtual void caption(const point&, const native_string_type&);
-				scheme *scheme_ptr() const { return scheme_ptr_; };
-			private:
-				graph_reference graph_;
-				scheme *scheme_ptr_;
-			};
-
 			class trigger
 				: public drawer_trigger
 			{

include/nana/gui/widgets/treebox.hpp

@@ -87,13 +87,15 @@ namespace nana
 			class trigger
 				:public drawer_trigger
 			{
-				template<typename Renderer>
+				//template<typename Renderer>
-				struct basic_implement;
+				//struct basic_implement;	//deprecated
 
-				class item_renderer;
+				class implementation;
+
+				//class item_renderer;	//deprecated
 				class item_locator;
 
-				typedef basic_implement<item_renderer> implement;
+				//typedef basic_implement<item_renderer> implement;	//deprecated
 			public:
 				struct treebox_node_type
 				{
@@ -116,27 +118,30 @@ namespace nana
 				trigger();
 				~trigger();
 
-				implement * impl() const;
+				implementation * impl() const;
 
 				void check(node_type*, checkstate);
 
-				void renderer(::nana::pat::cloneable<renderer_interface>&&);
+				pat::cloneable<renderer_interface>& renderer() const;
-				const ::nana::pat::cloneable<renderer_interface>& renderer() const;
+
+				//void renderer(::nana::pat::cloneable<renderer_interface>&&);
+				//const ::nana::pat::cloneable<renderer_interface>& renderer() const;	//deprecated
 				void placer(::nana::pat::cloneable<compset_placer_interface>&&);
 				const ::nana::pat::cloneable<compset_placer_interface>& placer() const;
 
 				node_type* insert(node_type*, const std::string& key, std::string&&);
 				node_type* insert(const std::string& path, std::string&&);
 
-				node_type * selected() const;
+				//node_type * selected() const;	//deprecated
-				void selected(node_type*);
+				//void selected(node_type*);
 
-				node_image_tag& icon(const ::std::string&) const;
+				node_image_tag& icon(const ::std::string&);
 				void icon_erase(const ::std::string&);
 				void node_icon(node_type*, const ::std::string& id);
 				unsigned node_width(const node_type*) const;
 
 				bool rename(node_type*, const char* key, const char* name);
+
 			private:
 				//Overrides drawer_trigger methods
 				void attached(widget_reference, graph_reference)		override;
@@ -152,7 +157,7 @@ namespace nana
 				void key_press(graph_reference, const arg_keyboard&)	override;
 				void key_char(graph_reference, const arg_keyboard&)	override;
 			private:
-				implement * const impl_;
+				implementation * const impl_;
 			}; //end class trigger
 
 
@@ -171,11 +176,11 @@ namespace nana
 
 				/// Append a child with a specified value (user object.).
 				template<typename T>
-				item_proxy append(const ::std::string& key, ::std::string name, const T&t)
+				item_proxy append(const ::std::string& key, ::std::string name, T&& t)
 				{
 					item_proxy ip = append(key, std::move(name));
 					if(false == ip.empty())
-						ip.value(t);
+						ip.value(std::forward<T>(t));
 					return ip;
 				}
 
@@ -291,17 +296,19 @@ namespace nana
 					return *p;
 				}
 
+				/*
 				template<typename T>
-				item_proxy & value(const T& t)
+				item_proxy & value(const T& t)	//deprecated
 				{
 					_m_value() = t;
 					return *this;
 				}
+				*/
 
 				template<typename T>
 				item_proxy & value(T&& t)
 				{
-					_m_value() = std::move(t);
+					_m_value() = std::forward<T>(t);
 					return *this;
 				}
 
@@ -378,7 +385,7 @@ namespace nana
 		template<typename ItemRenderer>
 		treebox & renderer(const ItemRenderer & rd) ///< set user-defined node renderer
 		{
-			get_drawer_trigger().renderer(::nana::pat::cloneable<renderer_interface>(rd));
+			get_drawer_trigger().renderer() = ::nana::pat::cloneable<renderer_interface>{rd};
 			return *this;
 		}
 
@@ -403,6 +410,23 @@ namespace nana
 		/// @param enable bool  whether to enable.
 		void auto_draw(bool enable);
 
+		/// Prevents drawing during execution.
+		template<typename Function>
+		void avoid_drawing(Function fn)
+		{
+			this->auto_draw(false);
+			try
+			{
+				fn();
+			}
+			catch (...)
+			{
+				this->auto_draw(true);
+				throw;
+			}
+			this->auto_draw(true);
+		}
+
 		/// \brief  Enable the checkboxs for each item of the widget.
 		/// @param enable bool  indicates whether to show or hide the checkboxs.
 		treebox & checkable(bool enable);
@@ -419,8 +443,9 @@ namespace nana
         /// These states are 'normal', 'hovered' and 'expanded'. 
         /// If 'hovered' or 'expanded' are not set, it uses 'normal' state image for these 2 states.
         /// See also in [documentation](http://nanapro.org/en-us/help/widgets/treebox.htm)
-		node_image_type& icon(const ::std::string& id ///< the name of an icon scheme. If the name is not existing, it creates a new scheme for the name.
+		/// @param id The name of an icon scheme. If the name is not existing, it creates a new scheme for the name.
-                               ) const;
+		/// @return The reference of node image scheme correspending with the specified id.
+		node_image_type& icon(const ::std::string& id);
 
 		void icon_erase(const ::std::string& id);
 
@@ -445,6 +470,19 @@ namespace nana
 
 		item_proxy selected() const; ///< returns the selected node
 
+		/// Scrolls a specified item into view.
+		/**
+		 * @param item An item to be requested.
+		 * @param bearing The position where the item to be positioned in the view.
+		 */
+		void scroll_into_view(item_proxy item, align_v bearing);
+
+		/// Scrolls a specified item into view.
+		/**
+		 * @param item An item to be requested.
+		 */
+		void scroll_into_view(item_proxy item);
+
 	private:
 		std::shared_ptr<scroll_operation_interface> _m_scroll_operation() override;
 

source/detail/platform_spec_posix.cpp

@@ -658,21 +658,31 @@ namespace detail
 		platform_scope_guard lock;
 		if(umake_owner(wd))
 		{
+			auto & wd_manager = detail::bedrock::instance().wd_manager();
+
+			std::vector<native_window_type> owned_children;
+
 			auto i = wincontext_.find(wd);
 			if(i != wincontext_.end())
 			{
 				if(i->second.owned)
 				{
-					set_error_handler();
+					for(auto child : *i->second.owned)
-					auto & wd_manager = detail::bedrock::instance().wd_manager();
+						owned_children.push_back(child);
-					for(auto u = i->second.owned->rbegin(); u != i->second.owned->rend(); ++u)
-						wd_manager.close(wd_manager.root(*u));
-
-					rev_error_handler();
-
-					delete i->second.owned;
 				}
+			}
 
+			//Closing a child will erase the wd from the table wincontext_, so the 
+			//iterator i can't be reused after children closed.
+			set_error_handler();
+			for(auto u = owned_children.rbegin(); u != owned_children.rend(); ++u)
+				wd_manager.close(wd_manager.root(*u));
+			rev_error_handler();
+
+			i = wincontext_.find(wd);
+			if(i != wincontext_.end())
+			{
+				delete i->second.owned;
 				wincontext_.erase(i);
 			}
 		}

source/gui/animation.cpp

@@ -1,7 +1,7 @@
 /*
  *	An Animation Implementation
  *	Nana C++ Library(http://www.nanapro.org)
- *	Copyright(C) 2003-2015 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
@@ -571,6 +571,25 @@ namespace nana
 			delete impl_;
 		}
 
+		animation::animation(animation&& rhs)
+			: impl_(rhs.impl_)
+		{
+			rhs.impl_ = new impl(23);
+		}
+
+		animation& animation::operator=(animation&& rhs)
+		{
+			if (this != &rhs)
+			{
+				auto imp = new impl{ 23 };
+
+				delete impl_;
+				impl_ = rhs.impl_;
+				rhs.impl_ = imp;
+			}
+			return *this;
+		}
+
 		void animation::push_back(frameset frms)
 		{
 			impl_->framesets.emplace_back(std::move(frms));

source/gui/detail/bedrock_posix.cpp

@@ -973,7 +973,12 @@ namespace detail
 			case Expose:
 				if(msgwnd->visible && (msgwnd->root_graph->empty() == false))
 				{
-					nana::detail::platform_scope_guard lock;
+					nana::internal_scope_guard lock;
+					//Don't lock this scope using platform-scope-guard. Because it would cause the platform-scope-lock to be locked
+					//before the internal-scope-guard, and the order of locking would cause dead-lock.
+					//
+					//Locks this scope using internal-scope-guard is correct and safe. In the scope, the Xlib functions aren't called
+					//directly.
 					if(msgwnd->is_draw_through())
 					{
 						msgwnd->other.attribute.root->draw_through();

source/gui/detail/native_window_interface.cpp

@@ -371,6 +371,8 @@ namespace nana{
 			}
 
 			Window parent = (owner ? reinterpret_cast<Window>(owner) : restrict::spec.root_window());
+
+			//The position passed to XCreateWindow is a screen coordinate.
 			nana::point pos(r.x, r.y);
 			if((false == nested) && owner)
 			{
@@ -396,7 +398,9 @@ namespace nana{
 				{
 					auto origin_owner = (owner ? owner : reinterpret_cast<native_window_type>(restrict::spec.root_window()));
 					restrict::spec.make_owner(origin_owner, reinterpret_cast<native_window_type>(handle));
-					exposed_positions[handle] = pos;
+
+					//The exposed_position is a relative position to its owner/parent.
+					exposed_positions[handle] = r.position();
 				}
 
 				XChangeWindowAttributes(disp, handle, attr_mask, &win_attr);
@@ -945,13 +949,14 @@ namespace nana{
 				auto fm_extents = window_frame_extents(wd);
 				origin.x = -fm_extents.left;
 				origin.y = -fm_extents.top;
-
+#if 0	//deprecated
 				if(reinterpret_cast<Window>(coord_wd) != restrict::spec.root_window())
 				{
 					fm_extents = window_frame_extents(coord_wd);
 					origin.x += fm_extents.left;
 					origin.y += fm_extents.top;
 				}
+#endif
 			}
 			else
 				coord_wd = get_window(wd, window_relationship::parent);
@@ -1010,8 +1015,14 @@ namespace nana{
 			if(owner && (owner != reinterpret_cast<native_window_type>(restrict::spec.root_window())))
 			{
 				auto origin = window_position(owner);
+#if 0
 				x += origin.x;
 				y += origin.y;
+#else
+				auto owner_extents = window_frame_extents(owner);
+				x += origin.x + owner_extents.left;
+				y += origin.y + owner_extents.top;
+#endif
 			}
 
 			::XMoveWindow(disp, reinterpret_cast<Window>(wd), x, y);
@@ -1099,8 +1110,14 @@ namespace nana{
 			if(owner && (owner != reinterpret_cast<native_window_type>(restrict::spec.root_window())))
 			{
 				auto origin = window_position(owner);
+#if 0
 				x += origin.x;
 				y += origin.y;
+#else
+				auto owner_extents = window_frame_extents(owner);
+				x += origin.x + owner_extents.left;
+				y += origin.y + owner_extents.top;
+#endif
 			}
 
 			::XMoveResizeWindow(disp, reinterpret_cast<Window>(wd), x, y, r.width, r.height);
@@ -1580,14 +1597,21 @@ namespace nana{
 				pos.y = point.y;
 				return true;
 			}
-			return false;
 #elif defined(NANA_X11)
 			nana::detail::platform_scope_guard psg;
 			int x = pos.x, y = pos.y;
 			Window child;
-			return (True == ::XTranslateCoordinates(restrict::spec.open_display(),
+			if(True == ::XTranslateCoordinates(restrict::spec.open_display(),
-													reinterpret_cast<Window>(wd), restrict::spec.root_window(), x, y, &pos.x, &pos.y, &child));
+													reinterpret_cast<Window>(wd), restrict::spec.root_window(), x, y, &pos.x, &pos.y, &child))
+			{
+				//deprecated
+				//auto fm_extents = window_frame_extents(wd);
+				//pos.x += fm_extents.left;
+				//pos.y += fm_extents.top;
+				return true;
+			}
 #endif
+			return false;
 		}
 
 		bool native_interface::calc_window_point(native_window_type wd, nana::point& pos)
@@ -1600,14 +1624,21 @@ namespace nana{
 				pos.y = point.y;
 				return true;
 			}
-			return false;
 #elif defined(NANA_X11)
 			nana::detail::platform_scope_guard psg;
 			int x = pos.x, y = pos.y;
 			Window child;
-			return (True == ::XTranslateCoordinates(restrict::spec.open_display(),
+			if(True == ::XTranslateCoordinates(restrict::spec.open_display(), restrict::spec.root_window(), reinterpret_cast<Window>(wd), x, y, &pos.x, &pos.y, &child))
-													restrict::spec.root_window(), reinterpret_cast<Window>(wd), x, y, &pos.x, &pos.y, &child));
+			{
+				//deprecated
+				//Now the origin of pos is the left-top corner of the window(including titlebar and border)
+				//auto fm_extents = window_frame_extents(wd);
+				//pos.x += fm_extents.left;
+				//pos.y += fm_extents.top;
+				return true;
+			}
 #endif
+			return false;
 		}
 
 		native_window_type native_interface::find_window(int x, int y)

source/gui/widgets/label.cpp

@@ -303,7 +303,7 @@ namespace nana
 							extent_size.width = width_px;
 
 						for (auto & vsline : rs.vslines)
-							extent_size.height += vsline.extent_height_px;
+							extent_size.height += static_cast<size::value_type>(vsline.extent_height_px);
 
 						content_lines.emplace_back(std::move(rs.vslines));
 
@@ -311,7 +311,8 @@ namespace nana
 							break;
 					}
 
-					if (allowed_width_px < extent_size.width)
+					//The width is not restricted if the allowed_width_px is zero.
+					if (allowed_width_px && (allowed_width_px < extent_size.width))
 						extent_size.width = allowed_width_px;
 
 					if (transient_.current_font != pre_font)
@@ -445,6 +446,10 @@ namespace nana
 								unsigned sub_text_px = 0;
 								auto sub_text_len = _m_fit_text(graph, data->text().substr(text_begin), rs.allowed_width, sub_text_px);
 
+								//At least one character must be displayed no matter whether the width is enough or not.
+								if (0 == sub_text_len)
+									sub_text_len = 1;
+
 								if (text_begin + sub_text_len < data->text().size())
 								{
 									//make a new visual line
@@ -886,7 +891,8 @@ namespace nana
 			if(graph_ptr->empty())
 			{
 				graph_ptr = &substitute;
-				graph_ptr->make({ 10, 10 });
+				substitute.make({ 10, 10 });
+				substitute.typeface(this->typeface());
 			}
 
 			return impl->renderer.measure(*graph_ptr, limited, impl->text_align, impl->text_align_v);

source/gui/widgets/menubar.cpp

@@ -1,7 +1,7 @@
 /*
 *	A Menubar implementation
 *	Nana C++ Library(http://www.nanapro.org)
-*	Copyright(C) 2009-2017 Jinhao(cnjinhao@hotmail.com)
+*	Copyright(C) 2009-2018 Jinhao(cnjinhao@hotmail.com)
 *
 *	Distributed under the Boost Software License, Version 1.0.
 *	(See accompanying file LICENSE_1_0.txt or copy at
@@ -215,12 +215,32 @@ namespace nana
 			};
 
 			//class item_renderer
-				item_renderer::item_renderer(window wd, graph_reference graph)
+			class item_renderer
-					:graph_(graph), scheme_ptr_(static_cast<scheme*>(API::dev::get_scheme(wd)))
+			{
-				{}
+			public:
-
+				enum class state
-				void item_renderer::background(const nana::point& pos, const nana::size& size, state item_state)
 				{
+					normal, highlighted, selected
+				};
+
+				using graph_reference = paint::graphics&;
+				using scheme = ::nana::drawerbase::menubar::scheme;
+
+				item_renderer(window, graph_reference);
+				virtual void background(const point&, const ::nana::size&, state);
+				virtual void caption(const point&, const native_string_type&);
+				scheme *scheme_ptr() const { return scheme_ptr_; };
+			private:
+				graph_reference graph_;
+				scheme *scheme_ptr_;
+			};
+
+			item_renderer::item_renderer(window wd, graph_reference graph)
+				:graph_(graph), scheme_ptr_(static_cast<scheme*>(API::dev::get_scheme(wd)))
+			{}
+
+			void item_renderer::background(const nana::point& pos, const nana::size& size, state item_state)
+			{
 					auto bground = scheme_ptr_->text_fgcolor;
 					::nana::color border, body;
 
@@ -245,13 +265,12 @@ namespace nana
 
 					paint::draw{ graph_ }.corner(r, 1);
 					graph_.rectangle(r.pare_off(1), true, body);
-				}
+			}
 
-				void item_renderer::caption(const point& pos, const native_string_type& text)
+			void item_renderer::caption(const point& pos, const native_string_type& text)
-				{
+			{
-					graph_.string(pos, text, scheme_ptr_->text_fgcolor);
+				graph_.string(pos, text, scheme_ptr_->text_fgcolor);
-
+			}
-				}
 			//end class item_renderer
 
 			//class trigger

source/gui/widgets/treebox.cpp

@@ -180,13 +180,13 @@ namespace nana
 				}
 			};//end class tooltip_window
 
-			//item_locator should be defined before the definition of basic_implement
+			//item_locator should be defined before the definition of implementation
 			class trigger::item_locator
 			{
 			public:
 				using node_type = tree_cont_type::node_type;
 
-				item_locator(implement * impl, int item_pos, int x, int y);
+				item_locator(implementation * impl, int item_pos, int x, int y);
 				int operator()(node_type &node, int affect);
 				node_type * node() const;
 				component what() const;
@@ -194,7 +194,7 @@ namespace nana
 
 				nana::rectangle text_pos() const;
 			private:
-				trigger::implement * impl_;
+				implementation * const impl_;
 				nana::point item_pos_;
 				const nana::point pos_;		//Mouse pointer position
 				component	what_;
@@ -212,11 +212,89 @@ namespace nana
 				}
 			};
 
-			//struct implement
+			//struct implementation
 			//@brief:	some data for treebox trigger
-			template<typename Renderer>
+			class trigger::implementation
-			struct trigger::basic_implement
 			{
+				class item_rendering_director
+					: public compset_interface
+				{
+				public:
+					using node_type = tree_cont_type::node_type;
+
+					item_rendering_director(implementation * impl, const nana::point& pos):
+						impl_(impl),
+						pos_(pos)
+					{
+					}
+
+					//affect
+					//0 = Sibling, the last is a sibling of node
+					//1 = Owner, the last is the owner of node
+					//>=2 = Children, the last is a child of a node that before this node.
+					int operator()(const node_type& node, int affect)
+					{
+						iterated_node_ = &node;
+						switch (affect)
+						{
+						case 1:
+							pos_.x += impl_->shape.indent_pixels;
+							break;
+						default:
+							if (affect >= 2)
+								pos_.x -= impl_->shape.indent_pixels * (affect - 1);
+						}
+
+						auto & comp_placer = impl_->data.comp_placer;
+
+						impl_->assign_node_attr(node_attr_, iterated_node_);
+						node_r_.x = node_r_.y = 0;
+						node_r_.width = comp_placer->item_width(*impl_->data.graph, node_attr_);
+						node_r_.height = comp_placer->item_height(*impl_->data.graph);
+
+						auto renderer = impl_->data.renderer;
+						renderer->begin_paint(*impl_->data.widget_ptr);
+						renderer->bground(*impl_->data.graph, this);
+						renderer->expander(*impl_->data.graph, this);
+						renderer->crook(*impl_->data.graph, this);
+						renderer->icon(*impl_->data.graph, this);
+						renderer->text(*impl_->data.graph, this);
+
+						pos_.y += node_r_.height;
+
+						if (pos_.y > static_cast<int>(impl_->data.graph->height()))
+							return 0;
+
+						return (node.child && node.value.second.expanded ? 1 : 2);
+					}
+				private:
+					//Overrides compset_interface
+					virtual const item_attribute_t& item_attribute() const override
+					{
+						return node_attr_;
+					}
+
+					virtual bool comp_attribute(component_t comp, comp_attribute_t& attr) const override
+					{
+						attr.area = node_r_;
+						if (impl_->data.comp_placer->locate(comp, node_attr_, &attr.area))
+						{
+							attr.mouse_pointed = node_attr_.mouse_pointed;
+							attr.area.x += pos_.x;
+							attr.area.y += pos_.y;
+							return true;
+						}
+						return false;
+					}
+				private:
+					implementation * const impl_;
+					::nana::point pos_;
+					const node_type * iterated_node_;
+					item_attribute_t node_attr_;
+					::nana::rectangle node_r_;
+				};
+
+			public:
 				using node_type = trigger::node_type;
 
 				struct rep_tag
@@ -271,7 +349,7 @@ namespace nana
 					nana::timer timer;
 				}adjust;
 			public:
-				basic_implement()
+				implementation()
 				{
 					data.graph			= nullptr;
 					data.widget_ptr		= nullptr;
@@ -353,6 +431,11 @@ namespace nana
 					return true;
 				}
 
+				static constexpr unsigned margin_top_bottom()
+				{
+					return 1;
+				}
+
 				bool draw(bool reset_scroll, bool ignore_update = false, bool ignore_auto_draw = false)
 				{
 					if(data.graph && (false == data.stop_drawing))
@@ -368,7 +451,7 @@ namespace nana
 								data.graph->rectangle(true, data.widget_ptr->bgcolor());
 
 							//Draw tree
-							attr.tree_cont.for_each(shape.first, Renderer(this, nana::point(static_cast<int>(attr.tree_cont.indent_size(shape.first) * shape.indent_pixels) - shape.offset_x, 1)));
+							attr.tree_cont.for_each(shape.first, item_rendering_director(this, nana::point(static_cast<int>(attr.tree_cont.indent_size(shape.first) * shape.indent_pixels) - shape.offset_x, margin_top_bottom())));
 
 							if (!ignore_update)
 								API::update_window(data.widget_ptr->handle());
@@ -460,6 +543,129 @@ namespace nana
 					return nullptr;
 				}
 
+				node_type* last(bool ignore_folded_children) const
+				{
+					auto p = attr.tree_cont.get_root();
+
+					while (true)
+					{
+						while (p->next)
+							p = p->next;
+
+						if (p->child)
+						{
+							if (p->value.second.expanded || !ignore_folded_children)
+							{
+								p = p->child;
+								continue;
+							}
+						}
+
+						break;
+					}
+
+					return p;
+				}
+
+				std::size_t screen_capacity(bool completed) const
+				{
+					auto const item_px = data.comp_placer->item_height(*data.graph);
+					auto screen_px = data.graph->size().height - (margin_top_bottom() << 1);
+					
+					if (completed || ((screen_px % item_px) == 0))
+						return screen_px / item_px;
+
+					return screen_px / item_px + 1;
+				}
+
+				bool scroll_into_view(node_type* node, bool use_bearing, align_v bearing)
+				{
+					auto & tree = attr.tree_cont;
+
+					auto parent = node->owner;
+
+					std::vector<node_type*> parent_path;
+					while (parent)
+					{
+						parent_path.push_back(parent);
+						parent = parent->owner;
+					}
+
+					bool has_expanded = false;
+
+					//Expands the shrinked nodes which are ancestors of node
+					for (auto i = parent_path.rbegin(); i != parent_path.rend(); ++i)
+					{
+						if (!(*i)->value.second.expanded)
+						{
+							has_expanded = true;
+							(*i)->value.second.expanded = true;
+							item_proxy iprx(data.trigger_ptr, *i);
+							data.widget_ptr->events().expanded.emit(::nana::arg_treebox{ *data.widget_ptr, iprx, true }, data.widget_ptr->handle());
+						}
+					}
+
+					auto pos = tree.distance_if(node, pred_allow_child{});
+					auto last_pos = tree.distance_if(last(true), pred_allow_child{});
+
+					auto const capacity = screen_capacity(true);
+					auto const item_px = data.comp_placer->item_height(*data.graph);
+
+					//If use_bearing is false, it calculates a bearing depending on the current
+					//position of the requested item.
+					if (!use_bearing)
+					{
+						auto first_pos = tree.distance_if(shape.first, pred_allow_child{});
+
+						if (pos < first_pos)
+							bearing = align_v::top;
+						else if (pos >= first_pos + capacity)
+							bearing = align_v::bottom;
+						else
+						{
+							//The item is already in the view.
+							//Returns true if a draw operation is needed
+							return has_expanded;
+						}
+					}
+
+					if (align_v::top == bearing)
+					{
+						if (last_pos - pos + 1 < capacity)
+						{
+							if (last_pos + 1 >= capacity)
+								pos = last_pos + 1 - capacity;
+							else
+								pos = 0;
+						}
+					}
+					else if (align_v::center == bearing)
+					{
+						auto const short_side = (std::min)(pos, last_pos - pos);
+						if (short_side >= capacity / 2)
+							pos -= capacity / 2;
+						else if (short_side == pos || (last_pos + 1 < capacity))
+							pos = 0;
+						else
+							pos = last_pos + 1 - capacity;
+					}
+					else if (align_v::bottom == bearing)
+					{
+						if (pos + 1 >= capacity)
+							pos = pos + 1 - capacity;
+						else
+							pos = 0;
+					}
+
+					auto prv_first = shape.first;
+					shape.first = attr.tree_cont.advance_if(nullptr, pos, drawerbase::treebox::pred_allow_child{});
+
+					//Update the position of scroll
+					show_scroll();
+
+					return has_expanded || (prv_first != shape.first);
+				}
+
 				bool make_adjust(node_type * node, int reason)
 				{
 					if(!node) return false;
@@ -1356,7 +1562,7 @@ namespace nana
 
 
 			//class trigger::item_locator
-				trigger::item_locator::item_locator(implement * impl, int item_pos, int x, int y)
+				trigger::item_locator::item_locator(implementation * impl, int item_pos, int x, int y)
 					:	impl_(impl),
 						item_pos_(item_pos, 1),
 						pos_(x, y),
@@ -1439,86 +1645,6 @@ namespace nana
 					return{node_text_r_.x + item_pos_.x, node_text_r_.y + item_pos_.y, node_text_r_.width, node_text_r_.height};
 				}
 			//end class item_locator
-
-			class trigger::item_renderer
-				: public compset_interface
-			{
-			public:
-				typedef tree_cont_type::node_type node_type;
-
-				item_renderer(implement * impl, const nana::point& pos)
-					:	impl_(impl),
-						pos_(pos)
-				{
-				}
-
-				//affect
-				//0 = Sibling, the last is a sibling of node
-				//1 = Owner, the last is the owner of node
-				//>=2 = Children, the last is a child of a node that before this node.
-				int operator()(const node_type& node, int affect)
-				{
-					implement * draw_impl = impl_;
-
-					iterated_node_ = &node;
-					switch(affect)
-					{
-					case 1:
-						pos_.x += draw_impl->shape.indent_pixels;
-						break;
-					default:
-						if(affect >= 2)
-							pos_.x -= draw_impl->shape.indent_pixels * (affect - 1);
-					}
-
-					auto & comp_placer = impl_->data.comp_placer;
-
-					impl_->assign_node_attr(node_attr_, iterated_node_);
-					node_r_.x = node_r_.y = 0;
-					node_r_.width = comp_placer->item_width(*impl_->data.graph, node_attr_);
-					node_r_.height = comp_placer->item_height(*impl_->data.graph);
-
-					auto renderer = draw_impl->data.renderer;
-					renderer->begin_paint(*draw_impl->data.widget_ptr);
-					renderer->bground(*draw_impl->data.graph, this);
-					renderer->expander(*draw_impl->data.graph, this);
-					renderer->crook(*draw_impl->data.graph, this);
-					renderer->icon(*draw_impl->data.graph, this);
-					renderer->text(*draw_impl->data.graph, this);
-
-					pos_.y += node_r_.height;
-
-					if(pos_.y > static_cast<int>(draw_impl->data.graph->height()))
-						return 0;
-
-					return (node.child && node.value.second.expanded ? 1 : 2);
-				}
-			private:
-				//Overrides compset_interface
-				virtual const item_attribute_t& item_attribute() const override
-				{
-					return node_attr_;
-				}
-
-				virtual bool comp_attribute(component_t comp, comp_attribute_t& attr) const override
-				{
-					attr.area = node_r_;
-					if (impl_->data.comp_placer->locate(comp, node_attr_, &attr.area))
-					{
-						attr.mouse_pointed = node_attr_.mouse_pointed;
-						attr.area.x += pos_.x;
-						attr.area.y += pos_.y;
-						return true;
-					}
-					return false;
-				}
-			private:
-				trigger::implement * impl_;
-				::nana::point pos_;
-				const node_type * iterated_node_;
-				item_attribute_t node_attr_;
-				::nana::rectangle node_r_;
-			};
 		}
 
 		//Treebox Implementation
@@ -1548,7 +1674,7 @@ namespace nana
 				//end struct treebox_node_type
 
 				trigger::trigger()
-					:	impl_(new implement)
+					:	impl_(new implementation)
 				{
 					impl_->data.trigger_ptr = this;
 					impl_->data.renderer = nana::pat::cloneable<renderer_interface>(internal_renderer());
@@ -1615,7 +1741,7 @@ namespace nana
 					delete impl_;
 				}
 
-				trigger::implement * trigger::impl() const
+				trigger::implementation * trigger::impl() const
 				{
 					return impl_;
 				}
@@ -1687,6 +1813,7 @@ namespace nana
 					}
 				}
 
+				/*	//deprecated
 				void trigger::renderer(::nana::pat::cloneable<renderer_interface>&& r)
 				{
 					impl_->data.renderer = std::move(r);
@@ -1696,6 +1823,12 @@ namespace nana
 				{
 					return impl_->data.renderer;
 				}
+				*/
+
+				::nana::pat::cloneable<renderer_interface>& trigger::renderer() const
+				{
+					return impl_->data.renderer;
+				}
 
 				void trigger::placer(::nana::pat::cloneable<compset_placer_interface>&& r)
 				{
@@ -1729,18 +1862,22 @@ namespace nana
 					return x;
 				}
 
-				trigger::node_type* trigger::selected() const
+				/*
+				trigger::node_type* trigger::selected() const	//deprecated
 				{
 					return impl_->node_state.selected;
 				}
+				*/
 
-				void trigger::selected(node_type* node)
+				/*
+				void trigger::selected(node_type* node)	//deprecated
 				{
 					if(impl_->attr.tree_cont.verify(node) && impl_->set_selected(node))
 						impl_->draw(true);
 				}
+				*/
 
-				node_image_tag& trigger::icon(const std::string& id) const
+				node_image_tag& trigger::icon(const std::string& id)
 				{
 					auto i = impl_->shape.image_table.find(id);
 					if(i != impl_->shape.image_table.end())
@@ -2167,7 +2304,7 @@ namespace nana
 				impl->draw(true);
 		}
 
-		treebox::node_image_type& treebox::icon(const std::string& id) const
+		treebox::node_image_type& treebox::icon(const std::string& id)
 		{
 			return get_drawer_trigger().icon(id);
 		}
@@ -2233,7 +2370,24 @@ namespace nana
 
 		treebox::item_proxy treebox::selected() const
 		{
-			return item_proxy(const_cast<drawer_trigger_t*>(&get_drawer_trigger()), get_drawer_trigger().selected());
+			//return item_proxy(const_cast<drawer_trigger_t*>(&get_drawer_trigger()), get_drawer_trigger().selected());	//deprecated
+			auto dw = &get_drawer_trigger();
+			return item_proxy(const_cast<drawer_trigger_t*>(dw), dw->impl()->node_state.selected);
+		}
+
+		void treebox::scroll_into_view(item_proxy item, align_v bearing)
+		{
+			internal_scope_guard lock;
+			if(get_drawer_trigger().impl()->scroll_into_view(item._m_node(), true, bearing))
+				API::refresh_window(*this);
+		}
+
+		void treebox::scroll_into_view(item_proxy item)
+		{
+			internal_scope_guard lock;
+			//The third argument for scroll_into_view is ignored if the second argument is false.
+			if(get_drawer_trigger().impl()->scroll_into_view(item._m_node(), false, align_v::center))
+				API::refresh_window(*this);
 		}
 
 		std::shared_ptr<scroll_operation_interface> treebox::_m_scroll_operation()