1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
/*
* 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.
*/
#pragma once
#include "ActiveDOMObject.h"
#include "EventTarget.h"
#include "MediaQuery.h"
#include "MediaQueryMatcher.h"
namespace WebCore {
namespace MQ {
class MediaQueryEvaluator;
}
// 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 MediaQueryList final : public RefCounted<MediaQueryList>, public EventTarget, public ActiveDOMObject {
WTF_MAKE_TZONE_OR_ISO_ALLOCATED(MediaQueryList);
public:
void ref() const final { RefCounted::ref(); }
void deref() const final { RefCounted::deref(); }
static Ref<MediaQueryList> create(Document&, MediaQueryMatcher&, MQ::MediaQueryList&&, bool matches);
~MediaQueryList();
String media() const;
bool matches();
void addListener(RefPtr<EventListener>&&);
void removeListener(RefPtr<EventListener>&&);
void evaluate(MQ::MediaQueryEvaluator&, MediaQueryMatcher::EventMode);
void detachFromMatcher();
private:
MediaQueryList(Document&, MediaQueryMatcher&, MQ::MediaQueryList&&, bool matches);
void setMatches(bool);
enum EventTargetInterfaceType eventTargetInterface() const final { return EventTargetInterfaceType::MediaQueryList; }
ScriptExecutionContext* scriptExecutionContext() const final { return ContextDestructionObserver::scriptExecutionContext(); }
void refEventTarget() final { ref(); }
void derefEventTarget() final { deref(); }
void eventListenersDidChange() final;
// ActiveDOMObject.
bool virtualHasPendingActivity() const final;
RefPtr<MediaQueryMatcher> m_matcher;
const MQ::MediaQueryList m_mediaQueries;
const OptionSet<MQ::MediaQueryDynamicDependency> m_dynamicDependencies;
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;
bool m_hasChangeEventListener { false };
bool m_needsNotification { false };
};
}
|
