src/plugins/litehtml_viewer/litehtml/media_query.h

   1 #ifndef LH_MEDIA_QUERY_H
   2 #define LH_MEDIA_QUERY_H
   3
   4 namespace litehtml
   5 {
   6         struct media_query_expression
   7         {
   8                 typedef std::vector<media_query_expression>     vector;
   9                 media_feature   feature;
  10                 int                             val;
  11                 int                             val2;
  12                 bool                    check_as_bool;
  13
  14                 media_query_expression()
  15                 {
  16                         check_as_bool   = false;
  17                         feature                 = media_feature_none;
  18                         val                             = 0;
  19                         val2                    = 0;
  20                 }
  21
  22                 bool check(const media_features& features) const;
  23         };
  24
  25         class media_query
  26         {
  27         public:
  28                 typedef std::shared_ptr<media_query>    ptr;
  29                 typedef std::vector<media_query::ptr>   vector;
  30         private:
  31                 media_query_expression::vector  m_expressions;
  32                 bool                                                    m_not;
  33                 media_type                                              m_media_type;
  34         public:
  35                 media_query();
  36                 media_query(const media_query& val);
  37
  38                 static media_query::ptr create_from_string(const string& str, const std::shared_ptr<document>& doc);
  39                 bool check(const media_features& features) const;
  40         };
  41
  42         class media_query_list
  43         {
  44         public:
  45                 typedef std::shared_ptr<media_query_list>       ptr;
  46                 typedef std::vector<media_query_list::ptr>      vector;
  47         private:
  48                 media_query::vector     m_queries;
  49                 bool                            m_is_used;
  50         public:
  51                 media_query_list();
  52                 media_query_list(const media_query_list& val);
  53
  54                 static media_query_list::ptr create_from_string(const string& str, const std::shared_ptr<document>& doc);
  55                 bool is_used() const;
  56                 bool apply_media_features(const media_features& features);      // returns true if the m_is_used changed
  57         };
  58
  59         inline media_query_list::media_query_list(const media_query_list& val)
  60         {
  61                 m_is_used       = val.m_is_used;
  62                 m_queries       = val.m_queries;
  63         }
  64
  65         inline media_query_list::media_query_list()
  66         {
  67                 m_is_used = false;
  68         }
  69
  70         inline bool media_query_list::is_used() const
  71         {
  72                 return m_is_used;
  73         }
  74
  75 }
  76
  77 #endif  // LH_MEDIA_QUERY_H