72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/*
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* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#include <memory>
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#include <wtf/Forward.h>
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#include <wtf/RefCounted.h>
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#include <wtf/Vector.h>
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#include <wtf/WeakPtr.h>
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namespace WebCore {
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class Document;
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class MediaQueryList;
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class MediaQueryEvaluator;
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class MediaQuerySet;
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class RenderStyle;
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// MediaQueryMatcher class is responsible for evaluating the queries whenever it
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// is needed and dispatch "change" event on MediaQueryLists if the corresponding
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// query has changed. MediaQueryLists are invoked in the order in which they were added.
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class MediaQueryMatcher final : public RefCounted<MediaQueryMatcher> {
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public:
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static Ref<MediaQueryMatcher> create(Document& document) { return adoptRef(*new MediaQueryMatcher(document)); }
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~MediaQueryMatcher();
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void documentDestroyed();
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void addMediaQueryList(MediaQueryList&);
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void removeMediaQueryList(MediaQueryList&);
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RefPtr<MediaQueryList> matchMedia(const String&);
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unsigned evaluationRound() const { return m_evaluationRound; }
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void evaluateAll();
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bool evaluate(const MediaQuerySet&);
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private:
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explicit MediaQueryMatcher(Document&);
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std::unique_ptr<RenderStyle> documentElementUserAgentStyle() const;
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String mediaType() const;
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WeakPtr<Document> m_document;
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Vector<WeakPtr<MediaQueryList>> m_mediaQueryLists;
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// This value is incremented at style selector changes.
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// It is used to avoid evaluating queries more then once and to make sure
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// that a media query result change is notified exactly once.
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unsigned m_evaluationRound { 1 };
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};
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} // namespace WebCore
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