1 /*
2 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
13 *
14 * You should have received a copy of the GNU Library General Public License
15 * along with this library; see the file COPYING.LIB. If not, write to
16 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
17 * Boston, MA 02110-1301, USA.
18 */
19
20 #include "config.h"
21 #include "core/css/MediaQueryList.h"
22
23 #include "core/css/MediaList.h"
24 #include "core/css/MediaQueryEvaluator.h"
25 #include "core/css/MediaQueryListListener.h"
26 #include "core/css/MediaQueryMatcher.h"
27
28 namespace WebCore {
29
create(PassRefPtrWillBeRawPtr<MediaQueryMatcher> vector,PassRefPtrWillBeRawPtr<MediaQuerySet> media,bool matches)30 PassRefPtrWillBeRawPtr<MediaQueryList> MediaQueryList::create(PassRefPtrWillBeRawPtr<MediaQueryMatcher> vector, PassRefPtrWillBeRawPtr<MediaQuerySet> media, bool matches)
31 {
32 return adoptRefWillBeNoop(new MediaQueryList(vector, media, matches));
33 }
34
MediaQueryList(PassRefPtrWillBeRawPtr<MediaQueryMatcher> vector,PassRefPtrWillBeRawPtr<MediaQuerySet> media,bool matches)35 MediaQueryList::MediaQueryList(PassRefPtrWillBeRawPtr<MediaQueryMatcher> vector, PassRefPtrWillBeRawPtr<MediaQuerySet> media, bool matches)
36 : m_matcher(vector)
37 , m_media(media)
38 , m_evaluationRound(m_matcher->evaluationRound())
39 , m_changeRound(m_evaluationRound - 1) // m_evaluationRound and m_changeRound initial values must be different.
40 , m_matches(matches)
41 {
42 }
43
DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(MediaQueryList)44 DEFINE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(MediaQueryList)
45
46 String MediaQueryList::media() const
47 {
48 return m_media->mediaText();
49 }
50
addListener(PassRefPtrWillBeRawPtr<MediaQueryListListener> listener)51 void MediaQueryList::addListener(PassRefPtrWillBeRawPtr<MediaQueryListListener> listener)
52 {
53 if (!listener)
54 return;
55
56 m_matcher->addListener(listener, this);
57 }
58
removeListener(PassRefPtrWillBeRawPtr<MediaQueryListListener> listener)59 void MediaQueryList::removeListener(PassRefPtrWillBeRawPtr<MediaQueryListListener> listener)
60 {
61 if (!listener)
62 return;
63
64 m_matcher->removeListener(listener.get(), this);
65 }
66
evaluate(MediaQueryEvaluator * evaluator)67 bool MediaQueryList::evaluate(MediaQueryEvaluator* evaluator)
68 {
69 if (m_evaluationRound != m_matcher->evaluationRound() && evaluator)
70 setMatches(evaluator->eval(m_media.get()));
71 return m_changeRound == m_matcher->evaluationRound();
72 }
73
setMatches(bool newValue)74 void MediaQueryList::setMatches(bool newValue)
75 {
76 m_evaluationRound = m_matcher->evaluationRound();
77
78 if (newValue == m_matches)
79 return;
80
81 m_matches = newValue;
82 m_changeRound = m_evaluationRound;
83 }
84
matches()85 bool MediaQueryList::matches()
86 {
87 if (m_evaluationRound != m_matcher->evaluationRound())
88 setMatches(m_matcher->evaluate(m_media.get()));
89 return m_matches;
90 }
91
trace(Visitor * visitor)92 void MediaQueryList::trace(Visitor* visitor)
93 {
94 visitor->trace(m_matcher);
95 visitor->trace(m_media);
96 }
97
98 }
99