| /* |
| * CSS Media Query Evaluator |
| * |
| * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef MediaQueryEvaluator_h |
| #define MediaQueryEvaluator_h |
| |
| #include "core/CoreExport.h" |
| #include "platform/heap/Handle.h" |
| #include "wtf/text/WTFString.h" |
| |
| namespace blink { |
| class LocalFrame; |
| class MediaQuery; |
| class MediaQueryExp; |
| class MediaQueryResult; |
| class MediaQuerySet; |
| class MediaValues; |
| |
| typedef WillBeHeapVector<RefPtrWillBeMember<MediaQueryResult>> MediaQueryResultList; |
| |
| // Class that evaluates css media queries as defined in |
| // CSS3 Module "Media Queries" (http://www.w3.org/TR/css3-mediaqueries/) |
| // Special constructors are needed, if simple media queries are to be |
| // evaluated without knowledge of the medium features. This can happen |
| // for example when parsing UA stylesheets, if evaluation is done |
| // right after parsing. |
| // |
| // the boolean parameter is used to approximate results of evaluation, if |
| // the device characteristics are not known. This can be used to prune the loading |
| // of stylesheets to only those which are probable to match. |
| |
| class CORE_EXPORT MediaQueryEvaluator { |
| WTF_MAKE_NONCOPYABLE(MediaQueryEvaluator); WTF_MAKE_FAST_ALLOCATED(MediaQueryEvaluator); |
| public: |
| // Creates evaluator which evaluates only simple media queries |
| // Evaluator returns true for "all", and returns value of \mediaFeatureResult |
| // for any media features. |
| |
| explicit MediaQueryEvaluator(bool mediaFeatureResult = false); |
| |
| // Creates evaluator which evaluates only simple media queries |
| // Evaluator returns true for acceptedMediaType and returns value of \mediafeatureResult |
| // for any media features. |
| |
| MediaQueryEvaluator(const char* acceptedMediaType, bool mediaFeatureResult = false); |
| |
| // Creates evaluator which evaluates full media queries. |
| explicit MediaQueryEvaluator(LocalFrame*); |
| |
| // Creates evaluator which evaluates in a thread-safe manner a subset of media values. |
| explicit MediaQueryEvaluator(const MediaValues&); |
| |
| ~MediaQueryEvaluator(); |
| |
| bool mediaTypeMatch(const String& mediaTypeToMatch) const; |
| |
| // Evaluates a list of media queries. |
| bool eval(const MediaQuerySet*, MediaQueryResultList* = 0) const; |
| |
| // Evaluates media query. |
| bool eval(const MediaQuery*, MediaQueryResultList*) const; |
| |
| // Evaluates media query subexpression, ie "and (media-feature: value)" part. |
| bool eval(const MediaQueryExp*) const; |
| |
| private: |
| const String mediaType() const; |
| |
| String m_mediaType; |
| bool m_expectedResult; |
| RefPtr<MediaValues> m_mediaValues; |
| }; |
| |
| } // namespace |
| #endif |