author | Simon Howkins <simonh@symbian.org> |
Mon, 15 Nov 2010 14:53:34 +0000 | |
branch | RCL_3 |
changeset 105 | 871af676edac |
parent 38 | 6297cdf66332 |
child 66 | cacf6ee57968 |
permissions | -rw-r--r-- |
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/* |
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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 MediaQueryEvaluator_h |
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#define MediaQueryEvaluator_h |
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#include "PlatformString.h" |
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namespace WebCore { |
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class Page; |
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class RenderStyle; |
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class MediaList; |
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class MediaQueryExp; |
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/** |
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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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*/ |
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class MediaQueryEvaluator |
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{ |
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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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*/ |
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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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*/ |
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MediaQueryEvaluator(const String& acceptedMediaType, bool mediaFeatureResult = false); |
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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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*/ |
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MediaQueryEvaluator(const String& acceptedMediaType, Page* page, RenderStyle* style); |
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~MediaQueryEvaluator(); |
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bool mediaTypeMatch(const String& mediaTypeToMatch) const; |
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bool mediaTypeMatchSpecific(const char* mediaTypeToMatch) const; |
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/** Evaluates a list of media queries */ |
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bool eval(const MediaList* query) const; |
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/** Evaluates media query subexpression, ie "and (media-feature: value)" part */ |
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bool eval(const MediaQueryExp* expr) const; |
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private: |
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String m_mediaType; |
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Page* m_page; // not owned |
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RenderStyle* m_style; // not owned |
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bool m_expResult; |
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}; |
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} // namespace |
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#endif |