зеркало из https://github.com/mozilla/gecko-dev.git
101 строка
3.0 KiB
C++
101 строка
3.0 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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/* base class for representation of media lists */
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#ifndef mozilla_dom_MediaList_h
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#define mozilla_dom_MediaList_h
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#include "mozilla/ErrorResult.h"
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#include "mozilla/ServoUtils.h"
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#include "mozilla/StyleBackendType.h"
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#include "nsIDOMMediaList.h"
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#include "nsWrapperCache.h"
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class nsIDocument;
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class nsPresContext;
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class nsMediaQueryResultCacheKey;
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namespace mozilla {
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class StyleSheet;
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namespace dom {
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// XXX This class doesn't use the branch dispatch approach that we use
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// elsewhere for stylo, but instead just relies on virtual call.
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// That's because this class should not be critical to performance,
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// and using branch dispatch would make it much more complicated.
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// Performance critical path should hold a subclass of this class
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// directly. We may want to determine in the future whether the
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// above is correct.
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class MediaList : public nsIDOMMediaList
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, public nsWrapperCache
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{
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public:
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NS_DECL_CYCLE_COLLECTING_ISUPPORTS
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(MediaList)
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/**
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* Creates a MediaList backed by the given StyleBackendType.
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*/
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static already_AddRefed<MediaList> Create(StyleBackendType,
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const nsAString& aMedia);
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virtual already_AddRefed<MediaList> Clone() = 0;
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JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) final;
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nsISupports* GetParentObject() const { return nullptr; }
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virtual void GetText(nsAString& aMediaText) = 0;
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virtual void SetText(const nsAString& aMediaText) = 0;
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virtual bool Matches(nsPresContext* aPresContext) const = 0;
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#ifdef DEBUG
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virtual bool IsServo() const = 0;
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#endif
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void SetStyleSheet(StyleSheet* aSheet);
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NS_DECL_NSIDOMMEDIALIST
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// WebIDL
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// XPCOM GetMediaText and SetMediaText are fine.
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virtual uint32_t Length() = 0;
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virtual void IndexedGetter(uint32_t aIndex, bool& aFound,
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nsAString& aReturn) = 0;
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// XPCOM Item is fine.
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void DeleteMedium(const nsAString& aMedium, ErrorResult& aRv)
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{
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aRv = DeleteMedium(aMedium);
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}
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void AppendMedium(const nsAString& aMedium, ErrorResult& aRv)
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{
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aRv = AppendMedium(aMedium);
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}
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protected:
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virtual nsresult Delete(const nsAString& aOldMedium) = 0;
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virtual nsresult Append(const nsAString& aNewMedium) = 0;
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virtual ~MediaList() {}
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// not refcounted; sheet will let us know when it goes away
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// mStyleSheet is the sheet that needs to be dirtied when this
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// medialist changes
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StyleSheet* mStyleSheet = nullptr;
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private:
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template<typename Func>
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inline nsresult DoMediaChange(Func aCallback);
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_MediaList_h
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