Source/WebCore/css/StyleMedia.cpp

/*
 * Copyright (C) 2009 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

#include "config.h"
#include "StyleMedia.h"

#include "CSSStyleSelector.h"
#include "Frame.h"
#include "FrameView.h"
#include "MediaList.h"
#include "MediaQueryEvaluator.h"

namespace WebCore {

StyleMedia::StyleMedia(Frame* frame)
    : m_frame(frame)
{
}

String StyleMedia::type() const
{
    FrameView* view = m_frame ? m_frame->view() : 0;
    if (view)
        return view->mediaType();

    return String();
}

bool StyleMedia::matchMedium(const String& query) const
{
    if (!m_frame)
        return false;

    Document* document = m_frame->document();
    ASSERT(document);
    Element* documentElement = document->documentElement();
    if (!documentElement)
        return false;

    CSSStyleSelector* styleSelector = document->styleSelector();
    if (!styleSelector)
        return false;

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

    ExceptionCode ec = 0;
    media->setMediaText(query, ec);
    if (ec)
        return false;

    MediaQueryEvaluator screenEval(type(), m_frame, rootStyle.get());
    return screenEval.eval(media.get());
}

} // namespace WebCore