media_query.h

#ifndef LH_MEDIA_QUERY_H
#define LH_MEDIA_QUERY_H
 
namespace litehtml
{
        struct media_query_expression
        {
                typedef std::vector<media_query_expression>     vector;
                media_feature   feature;
                int                             val;
                int                             val2;
                bool                    check_as_bool;
                
                media_query_expression()
                {
                        check_as_bool   = false;
                        feature                 = media_feature_none;
                        val                             = 0;
                        val2                    = 0;
                }
 
                bool check(const media_features& features) const;
        };
 
        class media_query
        {
        public:
                typedef std::shared_ptr<media_query>    ptr;
                typedef std::vector<media_query::ptr>   vector;
        private:
                media_query_expression::vector  m_expressions;
                bool                                                    m_not;
                media_type                                              m_media_type;
        public:
                media_query();
                media_query(const media_query& val);
 
                static media_query::ptr create_from_string(const tstring& str, const std::shared_ptr<document>& doc);
                bool check(const media_features& features) const;
        };
 
        class media_query_list
        {
        public:
                typedef std::shared_ptr<media_query_list>       ptr;
                typedef std::vector<media_query_list::ptr>      vector;
        private:
                media_query::vector     m_queries;
                bool                            m_is_used;
        public:
                media_query_list();
                media_query_list(const media_query_list& val);
 
                static media_query_list::ptr create_from_string(const tstring& str, const std::shared_ptr<document>& doc);
                bool is_used() const;
                bool apply_media_features(const media_features& features);      // returns true if the m_is_used changed
        };
 
        inline media_query_list::media_query_list(const media_query_list& val)
        {
                m_is_used       = val.m_is_used;
                m_queries       = val.m_queries;
        }
 
        inline media_query_list::media_query_list()
        {
                m_is_used = false;
        }
 
        inline bool media_query_list::is_used() const
        {
                return m_is_used;
        }
 
}
 
#endif  // LH_MEDIA_QUERY_H