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 MediaQueryMatcher_h 21 #define MediaQueryMatcher_h 22 23 #include "platform/heap/Handle.h" 24 #include "wtf/Forward.h" 25 #include "wtf/RefCounted.h" 26 27 namespace blink { 28 29 class Document; 30 class MediaQueryList; 31 class MediaQueryListListener; 32 class MediaQueryEvaluator; 33 class MediaQuerySet; 34 35 // MediaQueryMatcher class is responsible for keeping a vector of pairs 36 // MediaQueryList x MediaQueryListListener. It is responsible for evaluating the queries 37 // whenever it is needed and to call the listeners if the corresponding query has changed. 38 // The listeners must be called in the very same order in which they have been added. 39 40 class MediaQueryMatcher FINAL : public RefCountedWillBeGarbageCollectedFinalized<MediaQueryMatcher> { 41 DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(MediaQueryMatcher) 42 public: 43 static PassRefPtrWillBeRawPtr<MediaQueryMatcher> create(Document&); 44 void documentDetached(); 45 46 void addMediaQueryList(MediaQueryList*); 47 void removeMediaQueryList(MediaQueryList*); 48 49 void addViewportListener(PassRefPtrWillBeRawPtr<MediaQueryListListener>); 50 void removeViewportListener(PassRefPtrWillBeRawPtr<MediaQueryListListener>); 51 52 PassRefPtrWillBeRawPtr<MediaQueryList> matchMedia(const String&); 53 54 void mediaFeaturesChanged(); 55 void viewportChanged(); 56 bool evaluate(const MediaQuerySet*); 57 58 void trace(Visitor*); 59 60 private: 61 explicit MediaQueryMatcher(Document&); 62 63 PassOwnPtr<MediaQueryEvaluator> createEvaluator() const; 64 65 RawPtrWillBeMember<Document> m_document; 66 OwnPtr<MediaQueryEvaluator> m_evaluator; 67 68 typedef WillBeHeapLinkedHashSet<RawPtrWillBeWeakMember<MediaQueryList> > MediaQueryListSet; 69 MediaQueryListSet m_mediaLists; 70 71 typedef WillBeHeapLinkedHashSet<RefPtrWillBeMember<MediaQueryListListener> > ViewportListenerSet; 72 ViewportListenerSet m_viewportListeners; 73 }; 74 75 } 76 77 #endif // MediaQueryMatcher_h 78
