78 lines
2.9 KiB
C++
78 lines
2.9 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 "ActiveDOMObject.h"
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#include "EventTarget.h"
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#include "MediaList.h"
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#include "MediaQueryEvaluator.h"
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#include "MediaQueryMatcher.h"
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namespace WebCore {
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// MediaQueryList interface is specified at https://drafts.csswg.org/cssom-view/#the-mediaquerylist-interface
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// The objects of this class are returned by window.matchMedia. They may be used to
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// retrieve the current value of the given media query and to add/remove listeners that
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// will be called whenever the value of the query changes.
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class MediaQueryList final : public RefCounted<MediaQueryList>, public EventTargetWithInlineData, public ActiveDOMObject {
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WTF_MAKE_ISO_ALLOCATED(MediaQueryList);
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public:
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static Ref<MediaQueryList> create(Document&, MediaQueryMatcher&, Ref<MediaQuerySet>&&, bool matches);
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~MediaQueryList();
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String media() const;
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bool matches();
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void addListener(RefPtr<EventListener>&&);
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void removeListener(RefPtr<EventListener>&&);
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void evaluate(MediaQueryEvaluator&, bool& notificationNeeded);
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void detachFromMatcher();
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using RefCounted::ref;
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using RefCounted::deref;
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private:
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MediaQueryList(Document&, MediaQueryMatcher&, Ref<MediaQuerySet>&&, bool matches);
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void setMatches(bool);
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EventTargetInterface eventTargetInterface() const final { return MediaQueryListEventTargetInterfaceType; }
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ScriptExecutionContext* scriptExecutionContext() const final { return ContextDestructionObserver::scriptExecutionContext(); }
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void refEventTarget() final { ref(); }
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void derefEventTarget() final { deref(); }
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void eventListenersDidChange() final;
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// ActiveDOMObject.
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const char* activeDOMObjectName() const final;
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bool virtualHasPendingActivity() const final;
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RefPtr<MediaQueryMatcher> m_matcher;
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Ref<MediaQuerySet> m_media;
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unsigned m_evaluationRound; // Indicates if the query has been evaluated after the last style selector change.
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unsigned m_changeRound; // Used to know if the query has changed in the last style selector change.
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bool m_matches;
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bool m_hasChangeEventListener { false };
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};
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}
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