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 #ifndef MediaQueryList_h 21 #define MediaQueryList_h 22 23 #include <wtf/Forward.h> 24 #include <wtf/RefCounted.h> 25 #include <wtf/RefPtr.h> 26 27 namespace WebCore { 28 29 class MediaList; 30 class MediaQueryListListener; 31 class MediaQueryEvaluator; 32 class MediaQueryMatcher; 33 34 // MediaQueryList interface is specified at http://dev.w3.org/csswg/cssom-view/#the-mediaquerylist-interface 35 // The objects of this class are returned by window.matchMedia. They may be used to 36 // retrieve the current value of the given media query and to add/remove listeners that 37 // will be called whenever the value of the query changes. 38 39 class MediaQueryList : public RefCounted<MediaQueryList> { 40 public: 41 static PassRefPtr<MediaQueryList> create(PassRefPtr<MediaQueryMatcher>, PassRefPtr<MediaList>, bool); 42 ~MediaQueryList(); 43 44 String media() const; 45 bool matches(); 46 47 void addListener(PassRefPtr<MediaQueryListListener>); 48 void removeListener(PassRefPtr<MediaQueryListListener>); 49 50 void evaluate(MediaQueryEvaluator*, bool& notificationNeeded); 51 52 private: 53 MediaQueryList(PassRefPtr<MediaQueryMatcher>, PassRefPtr<MediaList>, bool matches); 54 void setMatches(bool); 55 56 RefPtr<MediaQueryMatcher> m_matcher; 57 RefPtr<MediaList> 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 65 #endif // MediaQueryList_h 66