forked from mirrors/gecko-dev
039592f4d8
This lifts a bunch of string conversions higher up the stack, but allows us to make the servo code use utf-8 unconditionally, and seemed faster in my benchmarking (see comment 0). It should also make a bunch of attribute setters faster too (like setting .cssText), now that we use UTF8String for them (we couldn't because we couldn't specify different string types for the getter and setters). Differential Revision: https://phabricator.services.mozilla.com/D99590
103 lines
3.1 KiB
C++
103 lines
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* implements DOM interface for querying and observing media queries */
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#ifndef mozilla_dom_MediaQueryList_h
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#define mozilla_dom_MediaQueryList_h
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#include "nsISupports.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsCOMPtr.h"
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#include "nsTArray.h"
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#include "mozilla/LinkedList.h"
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#include "mozilla/Attributes.h"
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#include "nsWrapperCache.h"
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#include "mozilla/DOMEventTargetHelper.h"
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#include "mozilla/dom/MediaQueryListBinding.h"
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namespace mozilla {
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namespace dom {
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class MediaList;
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class MediaQueryList final : public DOMEventTargetHelper,
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public LinkedListElement<MediaQueryList> {
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public:
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// The caller who constructs is responsible for calling Evaluate
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// before calling any other methods.
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MediaQueryList(Document* aDocument, const nsACString& aMediaQueryList,
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CallerType aCallerType);
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private:
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~MediaQueryList();
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public:
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(MediaQueryList, DOMEventTargetHelper)
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nsISupports* GetParentObject() const;
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// Returns whether we need to notify of the change event using
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// FireChangeEvent().
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[[nodiscard]] bool MediaFeatureValuesChanged();
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void FireChangeEvent();
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JSObject* WrapObject(JSContext* aCx,
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JS::Handle<JSObject*> aGivenProto) override;
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// WebIDL methods
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void GetMedia(nsACString& aMedia);
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bool Matches();
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void AddListener(EventListener* aListener, ErrorResult& aRv);
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void RemoveListener(EventListener* aListener, ErrorResult& aRv);
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using DOMEventTargetHelper::EventListenerAdded;
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void EventListenerAdded(nsAtom* aType) override;
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IMPL_EVENT_HANDLER(change)
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bool HasListeners();
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void Disconnect();
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size_t SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const;
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private:
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void LastRelease() final {
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auto listElement = static_cast<LinkedListElement<MediaQueryList>*>(this);
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if (listElement->isInList()) {
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listElement->remove();
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}
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}
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void RecomputeMatches();
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// We only need a pointer to the document to support lazy
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// reevaluation following dynamic changes. However, this lazy
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// reevaluation is perhaps somewhat important, since some usage
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// patterns may involve the creation of large numbers of
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// MediaQueryList objects which almost immediately become garbage
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// (after a single call to the .matches getter).
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//
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// This pointer does make us a little more dependent on cycle
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// collection.
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//
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// We have a non-null mDocument for our entire lifetime except
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// after cycle collection unlinking. Having a non-null mDocument
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// is equivalent to being in that document's mDOMMediaQueryLists
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// linked list.
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RefPtr<Document> mDocument;
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RefPtr<MediaList> mMediaList;
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bool mMatches;
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bool mMatchesValid;
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};
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} // namespace dom
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} // namespace mozilla
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#endif /* !defined(mozilla_dom_MediaQueryList_h) */
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