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/*
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef MediaQueryList_h
#define MediaQueryList_h
#include <wtf/Forward.h>
#include <wtf/RefCounted.h>
#include <wtf/RefPtr.h>
namespace WebCore {
class MediaList;
class MediaQueryListListener;
class MediaQueryEvaluator;
class MediaQueryMatcher;
// MediaQueryList interface is specified at http://dev.w3.org/csswg/cssom-view/#the-mediaquerylist-interface
// The objects of this class are returned by window.matchMedia. They may be used to
// retrieve the current value of the given media query and to add/remove listeners that
// will be called whenever the value of the query changes.
class MediaQueryList : public RefCounted<MediaQueryList> {
public:
static PassRefPtr<MediaQueryList> create(PassRefPtr<MediaQueryMatcher>, PassRefPtr<MediaList>, bool);
~MediaQueryList();
String media() const;
bool matches();
void addListener(PassRefPtr<MediaQueryListListener>);
void removeListener(PassRefPtr<MediaQueryListListener>);
void evaluate(MediaQueryEvaluator*, bool& notificationNeeded);
private:
MediaQueryList(PassRefPtr<MediaQueryMatcher>, PassRefPtr<MediaList>, bool matches);
void setMatches(bool);
RefPtr<MediaQueryMatcher> m_matcher;
RefPtr<MediaList> m_media;
unsigned m_evaluationRound; // Indicates if the query has been evaluated after the last style selector change.
unsigned m_changeRound; // Used to know if the query has changed in the last style selector change.
bool m_matches;
};
}
#endif // MediaQueryList_h
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