web/css_attributes.hpp: background_position完成！！

diff --git a/roast/include/roast/web/css_attributes.hpp b/roast/include/roast/web/css_attributes.hpp
index 7bb679b..fee558b 100644 (file)
--- a/roast/include/roast/web/css_attributes.hpp
+++ b/roast/include/roast/web/css_attributes.hpp
@@ -142,14 +142,31 @@ namespace roast
                                static const class _left{} left;
                                static const class _center{} center;
                                static const class _right{} right;
-                               
-                               background_position(const _left &) : _base("background-position", "left") {}
-                               background_position(const _center &) : _base("background-position", "center") {}
-                               background_position(const _right &) : _base("background-position", "right") {}
+                               static const class _top{} top;
+                               static const class _bottom{} bottom;
+                       private:
+                               const char* _horizontal(const _left &){ return "left"; }
+                               const char* _horizontal(const _center &){ return "center"; }
+                               const char* _horizontal(const _right &){ return "right"; }
+                               const char* _vertical(const _top &){ return "top"; }
+                               const char* _vertical(const _center &){ return "center"; }
+                               const char* _vertical(const _bottom &){ return "bottom"; }
+
+                               ::std::string _composite(const char* horizontal, const char* vertical){
+                                       ::std::string s(horizontal);
+                                       s += ' ';
+                                       s += vertical;
+                                       return s;
+                               }
+                       public: 
+                               template <typename T1, typename T2>
+                               background_position(const T1 &t1, const T2 &t2) : _base("background-position", _composite(_horizontal(t1), _vertical(t2)).c_str() ) {}
                        };
                        const background_position::_left background_position::left;
                        const background_position::_center background_position::center;
                        const background_position::_right background_position::right;
+                       const background_position::_top background_position::top;
+                       const background_position::_bottom background_position::bottom;
 /*
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