mediaqueryexp.h

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * CSS Media Query
 *
 * Copyright (C) 2006 Kimmo Kinnunen <[e-mail]>.
 *
 * 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 THE AUTHOR ``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. 
 */

#ifndef MediaQueryExp_h
#define MediaQueryExp_h

#include "AtomicString.h"
#include "CSSValue.h"
#include "MediaFeatureNames.h"
#include <wtf/RefPtr.h>

namespace WebCore {
class CSSParserValueList;

class MediaQueryExp
{
public:
    MediaQueryExp(const AtomicString& mediaFeature, CSSParserValueList* values);
    ~MediaQueryExp();

    AtomicString mediaFeature() const { return m_mediaFeature; }

    CSSValue* value() const { return m_value.get(); }

    bool operator==(const MediaQueryExp& other) const  {
        return (other.m_mediaFeature == m_mediaFeature)
            && ((!other.m_value && !m_value)
                || (other.m_value && m_value && other.m_value->cssText() == m_value->cssText()));
    }

    bool isViewportDependent() const { return m_mediaFeature == MediaFeatureNames::widthMediaFeature || 
                                              m_mediaFeature == MediaFeatureNames::heightMediaFeature ||
                                              m_mediaFeature == MediaFeatureNames::min_widthMediaFeature ||
                                              m_mediaFeature == MediaFeatureNames::min_heightMediaFeature ||
                                              m_mediaFeature == MediaFeatureNames::max_widthMediaFeature ||
                                              m_mediaFeature == MediaFeatureNames::max_heightMediaFeature; }
private:
    AtomicString m_mediaFeature;
    RefPtr<CSSValue> m_value;
};

} // namespace

#endif