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7686fb0b8f
Just rebuild the sheets when the viewport changes sizes since that's super rare in sky right now. This also causes a full document style recalc, but we'll fix that later too. For now lets make the system simpler. R=abarth@chromium.org Review URL: https://codereview.chromium.org/848483003
97 lines
3.7 KiB
C++
97 lines
3.7 KiB
C++
/*
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* CSS Media Query Evaluator
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*
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* Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_CORE_CSS_MEDIAQUERYEVALUATOR_H_
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#define SKY_ENGINE_CORE_CSS_MEDIAQUERYEVALUATOR_H_
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#include "sky/engine/platform/heap/Handle.h"
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#include "sky/engine/wtf/text/WTFString.h"
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namespace blink {
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class LocalFrame;
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class MediaQuery;
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class MediaQueryExp;
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class MediaQuerySet;
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class MediaValues;
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class RenderStyle;
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// Class that evaluates css media queries as defined in
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// CSS3 Module "Media Queries" (http://www.w3.org/TR/css3-mediaqueries/)
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// Special constructors are needed, if simple media queries are to be
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// evaluated without knowledge of the medium features. This can happen
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// for example when parsing UA stylesheets, if evaluation is done
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// right after parsing.
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//
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// the boolean parameter is used to approximate results of evaluation, if
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// the device characteristics are not known. This can be used to prune the loading
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// of stylesheets to only those which are probable to match.
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class MediaQueryEvaluator {
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WTF_MAKE_NONCOPYABLE(MediaQueryEvaluator); WTF_MAKE_FAST_ALLOCATED;
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public:
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// Creates evaluator which evaluates only simple media queries
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// Evaluator returns true for "all", and returns value of \mediaFeatureResult
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// for any media features.
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explicit MediaQueryEvaluator(bool mediaFeatureResult = false);
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// Creates evaluator which evaluates only simple media queries
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// Evaluator returns true for acceptedMediaType and returns value of \mediafeatureResult
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// for any media features.
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MediaQueryEvaluator(const char* acceptedMediaType, bool mediaFeatureResult = false);
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// Creates evaluator which evaluates full media queries.
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explicit MediaQueryEvaluator(LocalFrame*);
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// Creates evaluator which evaluates in a thread-safe manner a subset of media values.
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explicit MediaQueryEvaluator(const MediaValues&);
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~MediaQueryEvaluator();
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bool mediaTypeMatch(const String& mediaTypeToMatch) const;
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// Evaluates a list of media queries.
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bool eval(const MediaQuerySet*) const;
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// Evaluates media query.
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bool eval(const MediaQuery*) const;
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// Evaluates media query subexpression, ie "and (media-feature: value)" part.
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bool eval(const MediaQueryExp*) const;
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private:
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const String mediaType() const;
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String m_mediaType;
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bool m_expectedResult;
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RefPtr<MediaValues> m_mediaValues;
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};
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} // namespace
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#endif // SKY_ENGINE_CORE_CSS_MEDIAQUERYEVALUATOR_H_
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