toolbar : added toggle button

Following functions/methods have been add both to toolbar and item_proxy:
bool istoggle() const; ///< Returns true if the tool style is toggle.
				bool toggle() const; ///< Gets the tool toggle state (only if tool style is toggle).
				item_proxy& toggle(bool toggle_state); ///< Sets the tool toggle state (only if tool style is toggle).
				std::string toggle_group() const;	///< Returns the toggle group associated with the tool (only if tool style is toggle).
				item_proxy& toggle_group(const ::std::string& group);	///< Adds the tool to a toggle group (only if tool style is toggle).

include/nana/gui/widgets/toolbar.hpp

@@ -33,12 +33,49 @@ namespace nana
 	{
 		namespace toolbar
 		{
-		    struct item_proxy
+			enum class tool_type
 			{
-				nana::toolbar& widget;
+				button,
-				std::size_t button;
+				toggle
+			};
 
-				void enable(bool enable_state);
+		    class item_proxy
+		    {
+			public:
+				item_proxy(::nana::toolbar*, std::size_t pos);
+
+				bool enable() const;
+				item_proxy& enable(bool enable_state);
+
+				item_proxy& tooltype(tool_type type); ///< Sets the tool style.
+
+				bool istoggle() const; ///< Returns true if the tool style is toggle.
+				bool toggle() const; ///< Gets the tool toggle state (only if tool style is toggle).
+				item_proxy& toggle(bool toggle_state); ///< Sets the tool toggle state (only if tool style is toggle).
+				std::string toggle_group() const;	///< Returns the toggle group associated with the tool (only if tool style is toggle).
+				item_proxy& toggle_group(const ::std::string& group);	///< Adds the tool to a toggle group (only if tool style is toggle).
+
+			private:
+				nana::toolbar* const tb_;
+				std::size_t const pos_;
+		    };
+
+			struct item_type
+			{
+				std::string text;
+				nana::paint::image image;
+				unsigned	pixels{ 0 };
+				unsigned	position{ 0 }; // last item position.
+				nana::size	textsize;
+				bool		enable{ true };
+
+				tool_type	type{ tool_type::button };
+				bool		toggle{ false };
+				std::string group;
+
+				item_type(const std::string& text, const nana::paint::image& img, tool_type type)
+					:text(text), image(img), type(type)
+				{}
 			};
 
 			struct toolbar_events
@@ -49,7 +86,6 @@ namespace nana
 				basic_event<arg_toolbar> leave;		///< The mouse leaves a control button.
 			};
 
-			struct item_type;
 			class item_container;
 
 			class drawer
@@ -90,6 +126,7 @@ namespace nana
 	{
 	public:
 		using size_type = std::size_t;      ///< A type to count the number of elements.
+		using tool_type = drawerbase::toolbar::tool_type;
 
 		toolbar() = default;
 		toolbar(window, bool visible, bool detached=false);
@@ -102,6 +139,15 @@ namespace nana
 		
 		bool enable(size_type index) const;
 		void enable(size_type index, bool enable_state);
+
+		void tooltype(size_type index, tool_type type); ///< Sets the tool style.
+
+		bool istoggle(size_type index) const; ///< Returns true if the tool style is toggle.
+		bool toggle(size_type index) const; ///< Gets the tool toggle state (only if tool style is toggle).
+		void toggle(size_type index, bool toggle_state); ///< Sets the tool toggle state (only if tool style is toggle).
+		std::string toggle_group(size_type index) const;	///< Returns the toggle group associated with the tool (only if tool style is toggle).
+		void toggle_group(size_type index, const ::std::string& group);	///< Adds the tool to a toggle group (only if tool style is toggle).
+
 		void scale(unsigned s);   ///< Sets the scale of control button.
 
 		/// Enable to place buttons at right part. After calling it, every new button is right aligned.

source/gui/widgets/toolbar.cpp

@@ -27,26 +27,6 @@ namespace nana
 	{
 		namespace toolbar
 		{
-			struct item_type
-			{
-				enum kind{ button, container};
-
-				typedef std::size_t size_type;
-
-				std::string text;
-				nana::paint::image image;
-				unsigned	pixels{0};
-				unsigned    position{ 0 }; // last item position.
-				nana::size	textsize;
-				bool		enable{true};
-
-				kind type;
-
-				item_type(const std::string& text, const nana::paint::image& img, kind type)
-					:text(text), image(img), type(type)
-				{}
-			};
-
 			class item_container
 			{
 			public:
@@ -58,7 +38,7 @@ namespace nana
 					clear();
 				}
 
-				void insert(size_type pos, std::string text, const nana::paint::image& img, item_type::kind type)
+				void insert(size_type pos, std::string text, const nana::paint::image& img, tool_type type)
 				{
 					item_type* m = new item_type(std::move(text), img, type);
 
@@ -70,12 +50,12 @@ namespace nana
 
 				void push_back(const std::string& text, const nana::paint::image& img)
 				{
-					insert(cont_.size(), text, img, item_type::kind::button);
+					insert(cont_.size(), text, img, tool_type::button);
 				}
 
 				void push_back(const std::string& text)
 				{
-					insert(cont_.size(), text, nana::paint::image(), item_type::kind::button);
+					insert(cont_.size(), text, nana::paint::image(), tool_type::button);
 				}
 
 				//Contributed by kmribti(pr#105)
@@ -126,6 +106,45 @@ namespace nana
 					cont_.clear();
 				}
 
+
+				void update_toggle_group(item_type* item, bool toggle_state, bool clicked = true)
+				{
+					if(!item)
+						return;
+
+					if(item->group.empty())
+					{
+						item->toggle = toggle_state;
+						return;
+					}
+
+					// group rules:
+					//		1. inside a group only one item at the time is selected
+					//		2. inside a group one item must always be selected
+					//		3. a group with only one item IS NOT a group
+
+					bool is_group = false;
+
+					// look for other items inside the group
+					for(auto i : cont_)
+					{
+						if(i == item)
+							continue;
+
+						if(i && i->group == item->group)
+						{
+							if(toggle_state == false && clicked == false) // needs to avoid to break rule no. 2
+								return;
+
+							is_group = true;
+							i->toggle = false;
+						}
+					}
+
+					item->toggle = is_group ? true : toggle_state;
+				}
+
+
 			private:
 				container_type cont_;
 				size_t    right_{ npos };
@@ -152,6 +171,13 @@ namespace nana
 						if (state_t::highlighted == state || state_t::selected == state)
 							graph.gradual_rectangle(background_r.pare_off(1), bgcolor, static_cast<color_rgb>(state_t::selected == state ? 0x99CCFF : 0xC0DDFC), true);
 					}
+					else if (item.type == tool_type::toggle && item.toggle)
+					{
+						nana::rectangle background_r(x, y, width, height);
+						graph.rectangle(background_r, false, static_cast<color_rgb>(item.enable ? 0x3399FF : 0x999999));
+
+						graph.gradual_rectangle(background_r.pare_off(1), bgcolor, static_cast<color_rgb>(item.enable ? 0xC0DDFC : 0x969696), true);
+					}
 
 					if(!item.image.empty())
 					{
@@ -378,6 +404,10 @@ namespace nana
 						size_type which = _m_which(arg.pos, false);
 						if(impl_->which == which)
 						{
+							// update toggle state
+							auto m = impl_->items.at(impl_->which);
+							impl_->items.update_toggle_group(m, !m->toggle);
+
 							::nana::arg_toolbar arg{ *widget_, which };
 							widget_->events().selected.emit(arg, widget_->handle());
 
@@ -429,9 +459,52 @@ namespace nana
 			//class drawer
 
 			// Item Proxy
-			void item_proxy::enable(bool enable_state)
+			item_proxy::item_proxy(::nana::toolbar* t, std::size_t pos)
+				: tb_{ t }, pos_{ pos }
+			{}
+
+			bool item_proxy::enable() const
 			{
-				widget.enable(button, enable_state);
+				return tb_->enable(pos_);
+			}
+
+			item_proxy& item_proxy::enable(bool enable_state)
+			{
+				tb_->enable(pos_, enable_state);
+				return *this;
+			}
+
+			item_proxy& item_proxy::tooltype(tool_type type)
+			{
+				tb_->tooltype(pos_, type);
+				return *this;
+			}
+
+			bool item_proxy::istoggle() const
+			{
+				return tb_->istoggle(pos_);
+			}
+
+			bool item_proxy::toggle() const
+			{
+				return tb_->toggle(pos_);
+			}
+
+			item_proxy& item_proxy::toggle(bool toggle_state)
+			{
+				tb_->toggle(pos_, toggle_state);
+				return *this;
+			}
+
+			std::string item_proxy::toggle_group() const
+			{
+				return tb_->toggle_group(pos_);
+			}
+
+			item_proxy& item_proxy::toggle_group(const ::std::string& group)
+			{
+				tb_->toggle_group(pos_, group);
+				return *this;
 			}
 		}//end namespace toolbar
 	}//end namespace drawerbase
@@ -465,14 +538,14 @@ namespace nana
 		{
 			get_drawer_trigger().items().push_back(text, img);
 			API::refresh_window(handle());
-			return {*this, get_drawer_trigger().items().size() - 1u};
+			return {this, get_drawer_trigger().items().size() - 1u};
 		}
 
 		drawerbase::toolbar::item_proxy toolbar::append(const std::string& text)
 		{
 			get_drawer_trigger().items().push_back(text, {});
 			API::refresh_window(this->handle());
-			return {*this, get_drawer_trigger().items().size() - 1u};
+			return {this, get_drawer_trigger().items().size() - 1u};
 		}
 
 		void toolbar::clear()
@@ -507,6 +580,85 @@ namespace nana
 			}
 		}
 
+		void toolbar::tooltype(size_type index, tool_type type)
+		{
+			auto & items = get_drawer_trigger().items();
+
+			if(items.size() > index)
+			{
+				auto m = items.at(index);
+				if(m && m->type != type)
+				{
+					m->type = type;
+					API::refresh_window(this->handle());
+				}
+			}
+		}
+
+		bool toolbar::istoggle(size_type index) const
+		{
+			auto & items = get_drawer_trigger().items();
+
+			if(items.size() <= index)
+				return false;
+
+			auto m = items.at(index);
+			return (m && m->type == tool_type::toggle);
+		}
+
+		bool toolbar::toggle(size_type index) const
+		{
+			auto & items = get_drawer_trigger().items();
+
+			if(items.size() <= index)
+				return false;
+
+			auto m = items.at(index);
+			return (m && m->toggle);
+		}
+
+		void toolbar::toggle(size_type index, bool toggle_state)
+		{
+			auto & items = get_drawer_trigger().items();
+
+			if(items.size() > index)
+			{
+				auto m = items.at(index);
+				if(m)
+				{
+					items.update_toggle_group(m, toggle_state, false);
+
+					API::refresh_window(this->handle());
+				}
+			}
+		}
+
+		std::string toolbar::toggle_group(size_type index) const
+		{
+			auto & items = get_drawer_trigger().items();
+
+			if(items.size() <= index)
+				return "";
+
+			auto m = items.at(index);
+			return m ? m->group : "";
+		}
+
+		void toolbar::toggle_group(size_type index, const ::std::string& group)
+		{
+			auto & items = get_drawer_trigger().items();
+
+			if(items.size() > index)
+			{
+				auto m = items.at(index);
+				if(m && (m->group != group))
+				{
+					m->group = group;
+					API::refresh_window(this->handle()); //XXX
+				}
+			}
+		}
+
 		void toolbar::scale(unsigned s)
 		{
 			get_drawer_trigger().scale(s);