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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 THIRD_PARTY_BLINK_RENDERER_CORE_CSS_MEDIA_QUERY_LIST_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_MEDIA_QUERY_LIST_H_
#include "base/macros.h"
#include "third_party/blink/renderer/bindings/core/v8/active_script_wrappable.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/dom/context_lifecycle_observer.h"
#include "third_party/blink/renderer/core/dom/events/event_target.h"
#include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/forward.h"
namespace blink {
class ExecutionContext;
class MediaQueryListListener;
class MediaQueryMatcher;
class MediaQuerySet;
// MediaQueryList interface is specified at
// https://drafts.csswg.org/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 CORE_EXPORT MediaQueryList final
: public EventTargetWithInlineData,
public ActiveScriptWrappable<MediaQueryList>,
public ContextLifecycleObserver {
DEFINE_WRAPPERTYPEINFO();
USING_GARBAGE_COLLECTED_MIXIN(MediaQueryList);
public:
static MediaQueryList* Create(ExecutionContext*,
MediaQueryMatcher*,
scoped_refptr<MediaQuerySet>);
~MediaQueryList() override;
String media() const;
bool matches();
DEFINE_ATTRIBUTE_EVENT_LISTENER(change);
// These two functions are provided for compatibility with JS code
// written before the change listener became a DOM event.
void addDeprecatedListener(EventListener*);
void removeDeprecatedListener(EventListener*);
// C++ code can use these functions to listen to changes instead of having to
// use DOM event listeners.
void AddListener(MediaQueryListListener*);
void RemoveListener(MediaQueryListListener*);
// Will return true if a DOM event should be scheduled.
bool MediaFeaturesChanged(
HeapVector<Member<MediaQueryListListener>>* listeners_to_notify);
void Trace(blink::Visitor*) override;
// From ScriptWrappable
bool HasPendingActivity() const final;
// From ContextLifecycleObserver
void ContextDestroyed(ExecutionContext*) override;
const AtomicString& InterfaceName() const override;
ExecutionContext* GetExecutionContext() const override;
private:
MediaQueryList(ExecutionContext*,
MediaQueryMatcher*,
scoped_refptr<MediaQuerySet>);
bool UpdateMatches();
Member<MediaQueryMatcher> matcher_;
scoped_refptr<MediaQuerySet> media_;
using ListenerList = HeapLinkedHashSet<Member<MediaQueryListListener>>;
ListenerList listeners_;
bool matches_dirty_;
bool matches_;
DISALLOW_COPY_AND_ASSIGN(MediaQueryList);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_MEDIA_QUERY_LIST_H_
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