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      1 /*
      2  * Copyright (C) 2009 Apple Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  * 1. Redistributions of source code must retain the above copyright
      8  *    notice, this list of conditions and the following disclaimer.
      9  * 2. Redistributions in binary form must reproduce the above copyright
     10  *    notice, this list of conditions and the following disclaimer in the
     11  *    documentation and/or other materials provided with the distribution.
     12  *
     13  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
     14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
     17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
     18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
     20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
     21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     24  */
     25 
     26 #include "config.h"
     27 #include "core/css/StyleMedia.h"
     28 
     29 #include "core/css/MediaList.h"
     30 #include "core/css/MediaQueryEvaluator.h"
     31 #include "core/css/resolver/StyleResolver.h"
     32 #include "core/dom/Document.h"
     33 #include "core/page/Frame.h"
     34 #include "core/page/FrameView.h"
     35 
     36 namespace WebCore {
     37 
     38 StyleMedia::StyleMedia(Frame* frame)
     39     : DOMWindowProperty(frame)
     40 {
     41 }
     42 
     43 String StyleMedia::type() const
     44 {
     45     FrameView* view = m_frame ? m_frame->view() : 0;
     46     if (view)
     47         return view->mediaType();
     48 
     49     return String();
     50 }
     51 
     52 bool StyleMedia::matchMedium(const String& query) const
     53 {
     54     if (!m_frame)
     55         return false;
     56 
     57     Document* document = m_frame->document();
     58     ASSERT(document);
     59     Element* documentElement = document->documentElement();
     60     if (!documentElement)
     61         return false;
     62 
     63     StyleResolver* styleResolver = document->styleResolver();
     64     if (!styleResolver)
     65         return false;
     66 
     67     RefPtr<RenderStyle> rootStyle = styleResolver->styleForElement(documentElement, 0 /*defaultParent*/, DisallowStyleSharing, MatchOnlyUserAgentRules);
     68 
     69     RefPtr<MediaQuerySet> media = MediaQuerySet::create();
     70     if (!media->set(query))
     71         return false;
     72 
     73     MediaQueryEvaluator screenEval(type(), m_frame, rootStyle.get());
     74     return screenEval.eval(media.get());
     75 }
     76 
     77 } // namespace WebCore
     78