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 "MediaQueryMatcher.h"
22
23 #include "CSSStyleSelector.h"
24 #include "Document.h"
25 #include "Element.h"
26 #include "FrameView.h"
27 #include "MediaList.h"
28 #include "MediaQueryEvaluator.h"
29 #include "MediaQueryList.h"
30 #include "MediaQueryListListener.h"
31
32 namespace WebCore {
33
Listener(PassRefPtr<MediaQueryListListener> listener,PassRefPtr<MediaQueryList> query)34 MediaQueryMatcher::Listener::Listener(PassRefPtr<MediaQueryListListener> listener, PassRefPtr<MediaQueryList> query)
35 : m_listener(listener)
36 , m_query(query)
37 {
38 }
39
~Listener()40 MediaQueryMatcher::Listener::~Listener()
41 {
42 }
43
evaluate(ScriptState * state,MediaQueryEvaluator * evaluator)44 void MediaQueryMatcher::Listener::evaluate(ScriptState* state, MediaQueryEvaluator* evaluator)
45 {
46 bool notify;
47 m_query->evaluate(evaluator, notify);
48 if (notify)
49 m_listener->queryChanged(state, m_query.get());
50 }
51
MediaQueryMatcher(Document * document)52 MediaQueryMatcher::MediaQueryMatcher(Document* document)
53 : m_document(document)
54 , m_evaluationRound(1)
55 {
56 ASSERT(m_document);
57 }
58
~MediaQueryMatcher()59 MediaQueryMatcher::~MediaQueryMatcher()
60 {
61 }
62
documentDestroyed()63 void MediaQueryMatcher::documentDestroyed()
64 {
65 m_listeners.clear();
66 m_document = 0;
67 }
68
mediaType() const69 String MediaQueryMatcher::mediaType() const
70 {
71 if (!m_document || !m_document->frame() || !m_document->frame()->view())
72 return String();
73
74 return m_document->frame()->view()->mediaType();
75 }
76
prepareEvaluator() const77 PassOwnPtr<MediaQueryEvaluator> MediaQueryMatcher::prepareEvaluator() const
78 {
79 if (!m_document || !m_document->frame())
80 return 0;
81
82 Element* documentElement = m_document->documentElement();
83 if (!documentElement)
84 return 0;
85
86 CSSStyleSelector* styleSelector = m_document->styleSelector();
87 if (!styleSelector)
88 return 0;
89
90 RefPtr<RenderStyle> rootStyle = styleSelector->styleForElement(documentElement, 0 /*defaultParent*/, false /*allowSharing*/, true /*resolveForRootDefault*/);
91
92 return adoptPtr(new MediaQueryEvaluator(mediaType(), m_document->frame(), rootStyle.get()));
93 }
94
evaluate(MediaList * media)95 bool MediaQueryMatcher::evaluate(MediaList* media)
96 {
97 if (!media)
98 return false;
99
100 OwnPtr<MediaQueryEvaluator> evaluator(prepareEvaluator());
101 return evaluator && evaluator->eval(media);
102 }
103
matchMedia(const String & query)104 PassRefPtr<MediaQueryList> MediaQueryMatcher::matchMedia(const String& query)
105 {
106 if (!m_document)
107 return 0;
108
109 RefPtr<MediaList> media = MediaList::create(query, false);
110 return MediaQueryList::create(this, media, evaluate(media.get()));
111 }
112
addListener(PassRefPtr<MediaQueryListListener> listener,PassRefPtr<MediaQueryList> query)113 void MediaQueryMatcher::addListener(PassRefPtr<MediaQueryListListener> listener, PassRefPtr<MediaQueryList> query)
114 {
115 if (!m_document)
116 return;
117
118 for (size_t i = 0; i < m_listeners.size(); ++i) {
119 if (*m_listeners[i]->listener() == *listener && m_listeners[i]->query() == query)
120 return;
121 }
122
123 m_listeners.append(new Listener(listener, query));
124 }
125
removeListener(MediaQueryListListener * listener,MediaQueryList * query)126 void MediaQueryMatcher::removeListener(MediaQueryListListener* listener, MediaQueryList* query)
127 {
128 if (!m_document)
129 return;
130
131 for (size_t i = 0; i < m_listeners.size(); ++i) {
132 if (*m_listeners[i]->listener() == *listener && m_listeners[i]->query() == query) {
133 m_listeners.remove(i);
134 return;
135 }
136 }
137 }
138
styleSelectorChanged()139 void MediaQueryMatcher::styleSelectorChanged()
140 {
141 ASSERT(m_document);
142
143 ScriptState* scriptState = mainWorldScriptState(m_document->frame());
144 if (!scriptState)
145 return;
146
147 ++m_evaluationRound;
148 OwnPtr<MediaQueryEvaluator> evaluator = prepareEvaluator();
149 if (!evaluator)
150 return;
151
152 for (size_t i = 0; i < m_listeners.size(); ++i)
153 m_listeners[i]->evaluate(scriptState, evaluator.get());
154 }
155
156 }
157