gecko-dev/layout/style/MediaList.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* base class for representation of media lists */
#ifndef mozilla_dom_MediaList_h
#define mozilla_dom_MediaList_h
#include "mozilla/ErrorResult.h"
#include "mozilla/ServoUtils.h"
#include "nsIDOMMediaList.h"
#include "nsWrapperCache.h"
namespace mozilla {
class StyleSheet;
namespace dom {
// XXX This class doesn't use the branch dispatch approach that we use
// elsewhere for stylo, but instead just relies on virtual call.
// That's because this class should not be critical to performance,
// and using branch dispatch would make it much more complicated.
// Performance critical path should hold a subclass of this class
// directly. We may want to determine in the future whether the
// above is correct.
class MediaList : public nsIDOMMediaList
, public nsWrapperCache
{
public:
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(MediaList)
virtual already_AddRefed<MediaList> Clone() = 0;
JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) final;
nsISupports* GetParentObject() const { return nullptr; }
virtual void GetText(nsAString& aMediaText) = 0;
virtual void SetText(const nsAString& aMediaText) = 0;
void SetStyleSheet(StyleSheet* aSheet);
NS_DECL_NSIDOMMEDIALIST
// WebIDL
// XPCOM GetMediaText and SetMediaText are fine.
virtual uint32_t Length() = 0;
virtual void IndexedGetter(uint32_t aIndex, bool& aFound,
nsAString& aReturn) = 0;
// XPCOM Item is fine.
void DeleteMedium(const nsAString& aMedium, ErrorResult& aRv)
{
aRv = DeleteMedium(aMedium);
}
void AppendMedium(const nsAString& aMedium, ErrorResult& aRv)
{
aRv = AppendMedium(aMedium);
}
protected:
virtual nsresult Delete(const nsAString& aOldMedium) = 0;
virtual nsresult Append(const nsAString& aNewMedium) = 0;
virtual ~MediaList() {}
// not refcounted; sheet will let us know when it goes away
// mStyleSheet is the sheet that needs to be dirtied when this
// medialist changes
StyleSheet* mStyleSheet = nullptr;
private:
template<typename Func>
inline nsresult DoMediaChange(Func aCallback);
};
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_MediaList_h