| /* |
| * 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_LIST_H_ |
| #define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_MEDIA_QUERY_LIST_H_ |
| |
| #include "base/macros.h" |
| #include "third_party/blink/renderer/bindings/core/v8/active_script_wrappable.h" |
| #include "third_party/blink/renderer/core/core_export.h" |
| #include "third_party/blink/renderer/core/dom/context_lifecycle_observer.h" |
| #include "third_party/blink/renderer/core/dom/events/event_target.h" |
| #include "third_party/blink/renderer/platform/bindings/script_wrappable.h" |
| #include "third_party/blink/renderer/platform/heap/handle.h" |
| #include "third_party/blink/renderer/platform/wtf/forward.h" |
| |
| namespace blink { |
| |
| class ExecutionContext; |
| class MediaQueryListListener; |
| class MediaQueryMatcher; |
| class MediaQuerySet; |
| |
| // MediaQueryList interface is specified at |
| // https://drafts.csswg.org/cssom-view/#the-mediaquerylist-interface |
| // The objects of this class are returned by window.matchMedia. They may be used |
| // to retrieve the current value of the given media query and to add/remove |
| // listeners that will be called whenever the value of the query changes. |
| |
| class CORE_EXPORT MediaQueryList final |
| : public EventTargetWithInlineData, |
| public ActiveScriptWrappable<MediaQueryList>, |
| public ContextLifecycleObserver { |
| DEFINE_WRAPPERTYPEINFO(); |
| USING_GARBAGE_COLLECTED_MIXIN(MediaQueryList); |
| |
| public: |
| static MediaQueryList* Create(ExecutionContext*, |
| MediaQueryMatcher*, |
| scoped_refptr<MediaQuerySet>); |
| ~MediaQueryList() override; |
| |
| String media() const; |
| bool matches(); |
| |
| DEFINE_ATTRIBUTE_EVENT_LISTENER(change, kChange); |
| |
| // These two functions are provided for compatibility with JS code |
| // written before the change listener became a DOM event. |
| void addDeprecatedListener(EventListener*); |
| void removeDeprecatedListener(EventListener*); |
| |
| // C++ code can use these functions to listen to changes instead of having to |
| // use DOM event listeners. |
| void AddListener(MediaQueryListListener*); |
| void RemoveListener(MediaQueryListListener*); |
| |
| // Will return true if a DOM event should be scheduled. |
| bool MediaFeaturesChanged( |
| HeapVector<Member<MediaQueryListListener>>* listeners_to_notify); |
| |
| void Trace(blink::Visitor*) override; |
| |
| // From ScriptWrappable |
| bool HasPendingActivity() const final; |
| |
| // From ContextLifecycleObserver |
| void ContextDestroyed(ExecutionContext*) override; |
| |
| const AtomicString& InterfaceName() const override; |
| ExecutionContext* GetExecutionContext() const override; |
| |
| private: |
| MediaQueryList(ExecutionContext*, |
| MediaQueryMatcher*, |
| scoped_refptr<MediaQuerySet>); |
| |
| bool UpdateMatches(); |
| |
| Member<MediaQueryMatcher> matcher_; |
| scoped_refptr<MediaQuerySet> media_; |
| using ListenerList = HeapLinkedHashSet<Member<MediaQueryListListener>>; |
| ListenerList listeners_; |
| bool matches_dirty_; |
| bool matches_; |
| DISALLOW_COPY_AND_ASSIGN(MediaQueryList); |
| }; |
| |
| } // namespace blink |
| |
| #endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_MEDIA_QUERY_LIST_H_ |