Toolbar widget improvement.

This patch has 2 new features:

1- new option at constructor to enable creation of detached toolbar from
his parent, this enable the use of toolbar anywhere and the size can be
controlled by a layout manager.

2- add a new option in order to enable to place buttons at right part,
the widget has a new method go_right() after calling it, every new
button is right aligned.

Both changes don't break compatibility with old code.

include/nana/gui/widgets/toolbar.hpp

@@ -92,6 +92,13 @@ namespace nana
 		bool enable(size_type index) const;
 		void enable(size_type index, bool enable_state);
 		void scale(unsigned s);   ///< Sets the scale of control button.
+
+		void go_right();
+
+		bool detached() { return detached_; };
+
+	private:
+		bool   detached_;
 	};
 }//end namespace nana
 #endif

source/gui/widgets/toolbar.cpp

@@ -34,6 +34,7 @@ namespace nana
 				std::string text;
 				nana::paint::image image;
 				unsigned	pixels{0};
+				unsigned    position{ 0 }; // last item position.
 				nana::size	textsize;
 				bool		enable{true};
 
@@ -78,6 +79,16 @@ namespace nana
 					insert(cont_.size(), text, nana::paint::image(), item_type::kind::button);
 				}
 
+				void go_right()
+				{
+					right_ = cont_.size();
+				}
+
+				size_t right()
+				{
+					return right_;
+				}
+
 				void insert(size_type pos)
 				{
 					if(pos < cont_.size())
@@ -107,6 +118,7 @@ namespace nana
 				}
 			private:
 				container_type cont_;
+				size_t    right_{ npos };
 			};
 
 			class item_renderer
@@ -224,6 +236,7 @@ namespace nana
 						if (item)
 						{
 							_m_calc_pixels(item, false);
+							item->position = x;
 							ir(x, y, item->pixels, impl_->scale + ir.extra_size, *item, (index == impl_->which ? impl_->state : item_renderer::state_t::normal));
 							x += item->pixels;
 						}
@@ -234,6 +247,20 @@ namespace nana
 							x += 4;
 						}
 						++index;
+						if (index == impl_->items.right() && index < impl_->items.size())
+						{
+							int total_x = 0;
+							for (size_t i = index; i < impl_->items.size(); i++) {
+								if (impl_->items.at(i) == nullptr) {
+									total_x += 8; // we assume that separator has width = 8.
+								}
+								else {
+									_m_calc_pixels(impl_->items.at(i), false);
+									total_x += impl_->items.at(i)->pixels;
+								}
+							}
+							x = graph.size().width - total_x - 4;
+						}
 					}
 				}
 
@@ -244,6 +271,8 @@ namespace nana
 					widget_ = static_cast< ::nana::toolbar*>(&widget);
 					widget.caption("nana toolbar");
 
+					if (widget_->detached()) return;
+
 					impl_->event_size = API::events(widget.parent()).resized.connect_unignorable([this](const arg_resized& arg)
 					{
 						auto wd = widget_->handle();
@@ -399,6 +428,11 @@ namespace nana
 			create(wd, r, visible);
 		}
 
+		void toolbar::go_right()
+		{
+			get_drawer_trigger().items().go_right();
+		}
+
 		void toolbar::separate()
 		{
 			get_drawer_trigger().items().separate();