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1 /* | 1 /* |
2 * CSS Media Query Evaluator | 2 * CSS Media Query Evaluator |
3 * | 3 * |
4 * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>. | 4 * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>. |
5 * | 5 * |
6 * Redistribution and use in source and binary forms, with or without | 6 * Redistribution and use in source and binary forms, with or without |
7 * modification, are permitted provided that the following conditions | 7 * modification, are permitted provided that the following conditions |
8 * are met: | 8 * are met: |
9 * 1. Redistributions of source code must retain the above copyright | 9 * 1. Redistributions of source code must retain the above copyright |
10 * notice, this list of conditions and the following disclaimer. | 10 * notice, this list of conditions and the following disclaimer. |
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43 using MediaQueryResultList = HeapVector<Member<MediaQueryResult>>; | 43 using MediaQueryResultList = HeapVector<Member<MediaQueryResult>>; |
44 | 44 |
45 // Class that evaluates css media queries as defined in | 45 // Class that evaluates css media queries as defined in |
46 // CSS3 Module "Media Queries" (http://www.w3.org/TR/css3-mediaqueries/) | 46 // CSS3 Module "Media Queries" (http://www.w3.org/TR/css3-mediaqueries/) |
47 // Special constructors are needed, if simple media queries are to be | 47 // Special constructors are needed, if simple media queries are to be |
48 // evaluated without knowledge of the medium features. This can happen | 48 // evaluated without knowledge of the medium features. This can happen |
49 // for example when parsing UA stylesheets, if evaluation is done | 49 // for example when parsing UA stylesheets, if evaluation is done |
50 // right after parsing. | 50 // right after parsing. |
51 // | 51 // |
52 // the boolean parameter is used to approximate results of evaluation, if | 52 // the boolean parameter is used to approximate results of evaluation, if |
53 // the device characteristics are not known. This can be used to prune the loadi
ng | 53 // the device characteristics are not known. This can be used to prune the |
54 // of stylesheets to only those which are probable to match. | 54 // loading of stylesheets to only those which are probable to match. |
55 | 55 |
56 class CORE_EXPORT MediaQueryEvaluator final | 56 class CORE_EXPORT MediaQueryEvaluator final |
57 : public GarbageCollectedFinalized<MediaQueryEvaluator> { | 57 : public GarbageCollectedFinalized<MediaQueryEvaluator> { |
58 WTF_MAKE_NONCOPYABLE(MediaQueryEvaluator); | 58 WTF_MAKE_NONCOPYABLE(MediaQueryEvaluator); |
59 | 59 |
60 public: | 60 public: |
61 static void init(); | 61 static void init(); |
62 | 62 |
63 // Creates evaluator which evaluates only simple media queries | 63 // Creates evaluator which evaluates only simple media queries |
64 // Evaluator returns true for "all", and returns value of \mediaFeatureResult | 64 // Evaluator returns true for "all", and returns value of \mediaFeatureResult |
65 // for any media features. | 65 // for any media features. |
66 | 66 |
67 explicit MediaQueryEvaluator(bool mediaFeatureResult = false); | 67 explicit MediaQueryEvaluator(bool mediaFeatureResult = false); |
68 | 68 |
69 // Creates evaluator which evaluates only simple media queries | 69 // Creates evaluator which evaluates only simple media queries |
70 // Evaluator returns true for acceptedMediaType and returns value of \mediafe
atureResult | 70 // Evaluator returns true for acceptedMediaType and returns value of |
71 // for any media features. | 71 // \mediafeatureResult for any media features. |
72 | 72 |
73 MediaQueryEvaluator(const char* acceptedMediaType, | 73 MediaQueryEvaluator(const char* acceptedMediaType, |
74 bool mediaFeatureResult = false); | 74 bool mediaFeatureResult = false); |
75 | 75 |
76 // Creates evaluator which evaluates full media queries. | 76 // Creates evaluator which evaluates full media queries. |
77 explicit MediaQueryEvaluator(LocalFrame*); | 77 explicit MediaQueryEvaluator(LocalFrame*); |
78 | 78 |
79 // Creates evaluator which evaluates in a thread-safe manner a subset of media
values. | 79 // Creates evaluator which evaluates in a thread-safe manner a subset of media |
| 80 // values. |
80 explicit MediaQueryEvaluator(const MediaValues&); | 81 explicit MediaQueryEvaluator(const MediaValues&); |
81 | 82 |
82 ~MediaQueryEvaluator(); | 83 ~MediaQueryEvaluator(); |
83 | 84 |
84 bool mediaTypeMatch(const String& mediaTypeToMatch) const; | 85 bool mediaTypeMatch(const String& mediaTypeToMatch) const; |
85 | 86 |
86 // Evaluates a list of media queries. | 87 // Evaluates a list of media queries. |
87 bool eval(const MediaQuerySet*, | 88 bool eval(const MediaQuerySet*, |
88 MediaQueryResultList* viewportDependent = 0, | 89 MediaQueryResultList* viewportDependent = 0, |
89 MediaQueryResultList* deviceDependent = 0) const; | 90 MediaQueryResultList* deviceDependent = 0) const; |
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101 private: | 102 private: |
102 const String mediaType() const; | 103 const String mediaType() const; |
103 | 104 |
104 String m_mediaType; | 105 String m_mediaType; |
105 bool m_expectedResult; | 106 bool m_expectedResult; |
106 Member<MediaValues> m_mediaValues; | 107 Member<MediaValues> m_mediaValues; |
107 }; | 108 }; |
108 | 109 |
109 } // namespace blink | 110 } // namespace blink |
110 #endif | 111 #endif |
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