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 "MediaQueryList.h"
22
23 #include "MediaList.h"
24 #include "MediaQueryEvaluator.h"
25 #include "MediaQueryListListener.h"
26 #include "MediaQueryMatcher.h"
27
28 namespace WebCore {
29
create(PassRefPtr<MediaQueryMatcher> vector,PassRefPtr<MediaList> media,bool matches)30 PassRefPtr<MediaQueryList> MediaQueryList::create(PassRefPtr<MediaQueryMatcher> vector, PassRefPtr<MediaList> media, bool matches)
31 {
32 return adoptRef(new MediaQueryList(vector, media, matches));
33 }
34
MediaQueryList(PassRefPtr<MediaQueryMatcher> vector,PassRefPtr<MediaList> media,bool matches)35 MediaQueryList::MediaQueryList(PassRefPtr<MediaQueryMatcher> vector, PassRefPtr<MediaList> 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
~MediaQueryList()44 MediaQueryList::~MediaQueryList()
45 {
46 }
47
media() const48 String MediaQueryList::media() const
49 {
50 return m_media->mediaText();
51 }
52
addListener(PassRefPtr<MediaQueryListListener> listener)53 void MediaQueryList::addListener(PassRefPtr<MediaQueryListListener> listener)
54 {
55 if (!listener)
56 return;
57
58 m_matcher->addListener(listener, this);
59 }
60
removeListener(PassRefPtr<MediaQueryListListener> listener)61 void MediaQueryList::removeListener(PassRefPtr<MediaQueryListListener> listener)
62 {
63 if (!listener)
64 return;
65
66 m_matcher->removeListener(listener.get(), this);
67 }
68
evaluate(MediaQueryEvaluator * evaluator,bool & notificationNeeded)69 void MediaQueryList::evaluate(MediaQueryEvaluator* evaluator, bool& notificationNeeded)
70 {
71 if (m_evaluationRound != m_matcher->evaluationRound() && evaluator)
72 setMatches(evaluator->eval(m_media.get()));
73 notificationNeeded = m_changeRound == m_matcher->evaluationRound();
74 }
75
setMatches(bool newValue)76 void MediaQueryList::setMatches(bool newValue)
77 {
78 m_evaluationRound = m_matcher->evaluationRound();
79
80 if (newValue == m_matches)
81 return;
82
83 m_matches = newValue;
84 m_changeRound = m_evaluationRound;
85 }
86
matches()87 bool MediaQueryList::matches()
88 {
89 if (m_evaluationRound != m_matcher->evaluationRound())
90 setMatches(m_matcher->evaluate(m_media.get()));
91 return m_matches;
92 }
93
94 }
95