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 "StyleMedia.h"

    28 

    29 #include "CSSStyleSelector.h"

    30 #include "Frame.h"

    31 #include "FrameView.h"

    32 #include "MediaList.h"

    33 #include "MediaQueryEvaluator.h"

    34 

    35 namespace WebCore {

    36 

    37 StyleMedia::StyleMedia(Frame* frame)

    38     : m_frame(frame)

    39 {

    40 }

    41 

    42 String StyleMedia::type() const

    43 {

    44     FrameView* view = m_frame ? m_frame->view() : 0;

    45     if (view)

    46         return view->mediaType();

    47 

    48     return String();

    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     ASSERT(documentElement);

    60 

    61     CSSStyleSelector* styleSelector = document->styleSelector();

    62     if (!styleSelector)

    63         return false;

    64 

    65     RefPtr<RenderStyle> rootStyle = styleSelector->styleForElement(documentElement, 0 /*defaultParent*/, false /*allowSharing*/, true /*resolveForRootDefault*/);

    66     RefPtr<MediaList> media = MediaList::create();

    67 

    68     ExceptionCode ec = 0;

    69     media->setMediaText(query, ec);

    70     if (ec)

    71         return false;

    72 

    73     MediaQueryEvaluator screenEval(type(), m_frame, rootStyle.get());

    74     return screenEval.eval(media.get());

    75 }

    76 

    77 } // namespace WebCore