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
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
/*
* 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.
*/
#include "config.h"
#include "MediaQueryList.h"
#include "AddEventListenerOptions.h"
#include "EventNames.h"
#include <wtf/IsoMallocInlines.h>
namespace WebCore {
WTF_MAKE_ISO_ALLOCATED_IMPL(MediaQueryList);
MediaQueryList::MediaQueryList(Document& document, MediaQueryMatcher& matcher, Ref<MediaQuerySet>&& media, bool matches)
: ActiveDOMObject(&document)
, m_matcher(&matcher)
, m_media(WTFMove(media))
, m_evaluationRound(matcher.evaluationRound())
, m_changeRound(m_evaluationRound - 1) // Any value that is not the same as m_evaluationRound would do.
, m_matches(matches)
{
matcher.addMediaQueryList(*this);
}
Ref<MediaQueryList> MediaQueryList::create(Document& document, MediaQueryMatcher& matcher, Ref<MediaQuerySet>&& media, bool matches)
{
auto list = adoptRef(*new MediaQueryList(document, matcher, WTFMove(media), matches));
list->suspendIfNeeded();
return list;
}
MediaQueryList::~MediaQueryList()
{
if (m_matcher)
m_matcher->removeMediaQueryList(*this);
}
void MediaQueryList::detachFromMatcher()
{
m_matcher = nullptr;
}
String MediaQueryList::media() const
{
return m_media->mediaText();
}
void MediaQueryList::addListener(RefPtr<EventListener>&& listener)
{
if (!listener)
return;
addEventListener(eventNames().changeEvent, listener.releaseNonNull(), { });
}
void MediaQueryList::removeListener(RefPtr<EventListener>&& listener)
{
if (!listener)
return;
removeEventListener(eventNames().changeEvent, *listener, { });
}
void MediaQueryList::evaluate(MediaQueryEvaluator& evaluator, bool& notificationNeeded)
{
if (!m_matcher) {
notificationNeeded = false;
return;
}
if (m_evaluationRound != m_matcher->evaluationRound())
setMatches(evaluator.evaluate(m_media.get()));
notificationNeeded = m_changeRound == m_matcher->evaluationRound();
}
void MediaQueryList::setMatches(bool newValue)
{
ASSERT(m_matcher);
m_evaluationRound = m_matcher->evaluationRound();
if (newValue == m_matches)
return;
m_matches = newValue;
m_changeRound = m_evaluationRound;
}
bool MediaQueryList::matches()
{
if (m_matcher && m_evaluationRound != m_matcher->evaluationRound())
setMatches(m_matcher->evaluate(m_media.get()));
return m_matches;
}
void MediaQueryList::eventListenersDidChange()
{
m_hasChangeEventListener = hasEventListeners(eventNames().changeEvent);
}
const char* MediaQueryList::activeDOMObjectName() const
{
return "MediaQueryList";
}
bool MediaQueryList::virtualHasPendingActivity() const
{
return m_hasChangeEventListener && m_matcher;
}
}
|
