зеркало из https://github.com/mozilla/gecko-dev.git
105 строки
3.2 KiB
C++
105 строки
3.2 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/dom/BindingDeclarations.h"
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#include "mozilla/ErrorResult.h"
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#include "mozilla/ServoBindingTypes.h"
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#include "mozilla/ServoUtils.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 final : public nsISupports
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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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// Needed for CSSOM, but please don't use it outside of that :)
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explicit MediaList(already_AddRefed<RawServoMediaList> aRawList)
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: mRawList(aRawList)
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{ }
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static already_AddRefed<MediaList> Create(const nsAString& aMedia,
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CallerType aCallerType =
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CallerType::NonSystem);
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already_AddRefed<MediaList> Clone();
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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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void GetText(nsAString& aMediaText);
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void SetText(const nsAString& aMediaText);
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bool Matches(nsPresContext* aPresContext) const;
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void SetStyleSheet(StyleSheet* aSheet);
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// WebIDL
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void Stringify(nsAString& aString)
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{
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GetMediaText(aString);
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}
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void GetMediaText(nsAString& aMediaText);
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void SetMediaText(const nsAString& aMediaText);
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uint32_t Length();
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void IndexedGetter(uint32_t aIndex, bool& aFound, nsAString& aReturn);
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void Item(uint32_t aIndex, nsAString& aResult);
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void DeleteMedium(const nsAString& aMedium, ErrorResult& aRv);
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void AppendMedium(const nsAString& aMedium, ErrorResult& aRv);
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protected:
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MediaList(const nsAString& aMedia, CallerType);
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MediaList();
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void SetTextInternal(const nsAString& aMediaText, CallerType);
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nsresult Delete(const nsAString& aOldMedium);
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nsresult Append(const nsAString& aNewMedium);
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~MediaList()
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{
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MOZ_ASSERT(!mStyleSheet, "Backpointer should have been cleared");
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}
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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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RefPtr<RawServoMediaList> mRawList;
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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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