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 | #pragma once |
21 | |
22 | #include <wtf/Forward.h> |
23 | #include <wtf/RefCounted.h> |
24 | #include <wtf/RefPtr.h> |
25 | |
26 | namespace WebCore { |
27 | |
28 | class MediaQueryListListener; |
29 | class MediaQueryEvaluator; |
30 | class MediaQueryMatcher; |
31 | class MediaQuerySet; |
32 | |
33 | // MediaQueryList interface is specified at http://dev.w3.org/csswg/cssom-view/#the-mediaquerylist-interface |
34 | // The objects of this class are returned by window.matchMedia. They may be used to |
35 | // retrieve the current value of the given media query and to add/remove listeners that |
36 | // will be called whenever the value of the query changes. |
37 | |
38 | class MediaQueryList final : public RefCounted<MediaQueryList> { |
39 | public: |
40 | static Ref<MediaQueryList> create(MediaQueryMatcher&, Ref<MediaQuerySet>&&, bool); |
41 | ~MediaQueryList(); |
42 | |
43 | String media() const; |
44 | bool matches(); |
45 | |
46 | void addListener(RefPtr<MediaQueryListListener>&&); |
47 | void removeListener(RefPtr<MediaQueryListListener>&&); |
48 | |
49 | void evaluate(MediaQueryEvaluator&, bool& notificationNeeded); |
50 | |
51 | private: |
52 | MediaQueryList(MediaQueryMatcher&, Ref<MediaQuerySet>&&, bool matches); |
53 | |
54 | void setMatches(bool); |
55 | |
56 | Ref<MediaQueryMatcher> m_matcher; |
57 | Ref<MediaQuerySet> m_media; |
58 | unsigned m_evaluationRound; // Indicates if the query has been evaluated after the last style selector change. |
59 | unsigned m_changeRound; // Used to know if the query has changed in the last style selector change. |
60 | bool m_matches; |
61 | }; |
62 | |
63 | } |
64 | |