• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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