third_party/WebKit/Source/core/css/StyleMedia.cpp

   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/dom/Document.h"
  32 #include "core/frame/FrameView.h"
  33 #include "core/frame/LocalFrame.h"
  34
  35 namespace blink {
  36
  37 StyleMedia::StyleMedia(LocalFrame* frame)
  38     : DOMWindowProperty(frame)
  39 {
  40 }
  41
  42 AtomicString StyleMedia::type() const
  43 {
  44     FrameView* view = m_frame ? m_frame->view() : nullptr;
  45     if (view)
  46         return view->mediaType();
  47
  48     return nullAtom;
  49 }
  50
  51 bool StyleMedia::matchMedium(const String& query) const
  52 {
  53     if (!m_frame)
  54         return false;
  55
  56     Document* document = m_frame->document();
  57     ASSERT(document);
  58     Element* documentElement = document->documentElement();
  59     if (!documentElement)
  60         return false;
  61
  62     RefPtrWillBeRawPtr<MediaQuerySet> media = MediaQuerySet::create();
  63     if (!media->set(query))
  64         return false;
  65
  66     MediaQueryEvaluator screenEval(m_frame);
  67     return screenEval.eval(media.get());
  68 }
  69
  70 DEFINE_TRACE(StyleMedia)
  71 {
  72     DOMWindowProperty::trace(visitor);
  73 }
  74
  75 } // namespace blink