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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 MediaQueryMatcher_h
#define MediaQueryMatcher_h
#include "base/macros.h"
#include "core/CoreExport.h"
#include "platform/heap/Handle.h"
#include "platform/wtf/Forward.h"
namespace blink {
class Document;
class MediaQueryList;
class MediaQueryListListener;
class MediaQueryEvaluator;
class MediaQuerySet;
// MediaQueryMatcher class is responsible for keeping a vector of pairs
// MediaQueryList x MediaQueryListListener. It is responsible for evaluating the
// queries whenever it is needed and to call the listeners if the corresponding
// query has changed. The listeners must be called in the very same order in
// which they have been added.
class CORE_EXPORT MediaQueryMatcher final
: public GarbageCollectedFinalized<MediaQueryMatcher> {
public:
static MediaQueryMatcher* Create(Document&);
~MediaQueryMatcher();
void DocumentDetached();
void AddMediaQueryList(MediaQueryList*);
void RemoveMediaQueryList(MediaQueryList*);
void AddViewportListener(MediaQueryListListener*);
void RemoveViewportListener(MediaQueryListListener*);
MediaQueryList* MatchMedia(const String&);
void MediaFeaturesChanged();
void ViewportChanged();
bool Evaluate(const MediaQuerySet*);
void Trace(blink::Visitor*);
private:
explicit MediaQueryMatcher(Document&);
MediaQueryEvaluator* CreateEvaluator() const;
Member<Document> document_;
Member<MediaQueryEvaluator> evaluator_;
using MediaQueryListSet = HeapLinkedHashSet<WeakMember<MediaQueryList>>;
MediaQueryListSet media_lists_;
using ViewportListenerSet = HeapLinkedHashSet<Member<MediaQueryListListener>>;
ViewportListenerSet viewport_listeners_;
DISALLOW_COPY_AND_ASSIGN(MediaQueryMatcher);
};
} // namespace blink
#endif // MediaQueryMatcher_h