| /* |
| * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies) |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Library General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Library General Public License for more details. |
| * |
| * You should have received a copy of the GNU Library General Public License |
| * along with this library; see the file COPYING.LIB. If not, write to |
| * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_MEDIA_QUERY_MATCHER_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_MEDIA_QUERY_MATCHER_H_ |
| |
| #include "base/macros.h" |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/platform/heap/handle.h" |
| #include "third_party/blink/renderer/platform/wtf/forward.h" |
| |
| namespace blink { |
| |
| class Document; |
| class MediaQueryList; |
| class MediaQueryListListener; |
| class MediaQueryEvaluator; |
| class MediaQuerySet; |
| |
| // MediaQueryMatcher class is responsible for keeping a vector of pairs |
| // MediaQueryList x MediaQueryListListener. It is responsible for evaluating the |
| // queries whenever it is needed and to call the listeners if the corresponding |
| // query has changed. The listeners must be called in the very same order in |
| // which they have been added. |
| |
| class CORE_EXPORT MediaQueryMatcher final |
| : public GarbageCollectedFinalized<MediaQueryMatcher> { |
| |
| public: |
| static MediaQueryMatcher* Create(Document&); |
| |
| explicit MediaQueryMatcher(Document&); |
| ~MediaQueryMatcher(); |
| |
| void DocumentDetached(); |
| |
| void AddMediaQueryList(MediaQueryList*); |
| void RemoveMediaQueryList(MediaQueryList*); |
| |
| void AddViewportListener(MediaQueryListListener*); |
| void RemoveViewportListener(MediaQueryListListener*); |
| |
| MediaQueryList* MatchMedia(const String&); |
| |
| void MediaFeaturesChanged(); |
| void ViewportChanged(); |
| bool Evaluate(const MediaQuerySet*); |
| |
| void Trace(blink::Visitor*); |
| |
| private: |
| MediaQueryEvaluator* CreateEvaluator() const; |
| |
| Member<Document> document_; |
| Member<MediaQueryEvaluator> evaluator_; |
| |
| using MediaQueryListSet = HeapLinkedHashSet<WeakMember<MediaQueryList>>; |
| MediaQueryListSet media_lists_; |
| |
| using ViewportListenerSet = HeapLinkedHashSet<Member<MediaQueryListListener>>; |
| ViewportListenerSet viewport_listeners_; |
| DISALLOW_COPY_AND_ASSIGN(MediaQueryMatcher); |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_MEDIA_QUERY_MATCHER_H_ |