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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/. */
#ifndef DOM_SVG_DOMSVGSTRINGLIST_H_
#define DOM_SVG_DOMSVGSTRINGLIST_H_
#include "SVGElement.h"
#include "mozilla/Attributes.h"
#include "mozilla/RefPtr.h"
#include "nsCycleCollectionParticipant.h"
namespace mozilla {
class ErrorResult;
class SVGStringList;
namespace dom {
/**
* Class DOMSVGStringList
*
* This class is used to create the DOM tearoff objects that wrap internal
* SVGPathData objects.
*
* See the architecture comment in DOMSVGAnimatedLengthList.h first (that's
* LENGTH list), then continue reading the remainder of this comment.
*
* The architecture of this class is similar to that of DOMSVGLengthList
* except for two important aspects:
*
* First, since there is no nsIDOMSVGAnimatedStringList interface in SVG, we
* have no parent DOMSVGAnimatedStringList (unlike DOMSVGLengthList which has
* a parent DOMSVGAnimatedLengthList class). As a consequence, much of the
* logic that would otherwise be in DOMSVGAnimatedStringList (and is in
* DOMSVGAnimatedLengthList) is contained in this class.
*
* Second, since there is no nsIDOMSVGString interface in SVG, we have no
* DOMSVGString items to maintain. As far as script is concerned, objects
* of this class contain a list of strings, not a list of mutable objects
* like the other SVG list types. As a result, unlike the other SVG list
* types, this class does not create its items lazily on demand and store
* them so it can return the same objects each time. It simply returns a new
* string each time any given item is requested.
*/
class DOMSVGStringList final : public nsISupports, public nsWrapperCache {
friend class AutoChangeStringListNotifier;
public:
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(DOMSVGStringList)
dom::SVGElement* GetParentObject() const { return mElement; }
JSObject* WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) override;
uint32_t NumberOfItems() const;
uint32_t Length() const;
void Clear();
void Initialize(const nsAString& aNewItem, nsAString& aRetval,
ErrorResult& aRv);
void GetItem(uint32_t aIndex, nsAString& aRetval, ErrorResult& aRv);
void IndexedGetter(uint32_t aIndex, bool& aFound, nsAString& aRetval);
void InsertItemBefore(const nsAString& aNewItem, uint32_t aIndex,
nsAString& aRetval, ErrorResult& aRv);
void ReplaceItem(const nsAString& aNewItem, uint32_t aIndex,
nsAString& aRetval, ErrorResult& aRv);
void RemoveItem(uint32_t aIndex, nsAString& aRetval, ErrorResult& aRv);
void AppendItem(const nsAString& aNewItem, nsAString& aRetval,
ErrorResult& aRv);
/**
* Factory method to create and return a DOMSVGStringList wrapper
* for a given internal SVGStringList object. The factory takes care
* of caching the object that it returns so that the same object can be
* returned for the given SVGStringList each time it is requested.
* The cached object is only removed from the cache when it is destroyed due
* to there being no more references to it. If that happens, any subsequent
* call requesting the DOM wrapper for the SVGStringList will naturally
* result in a new DOMSVGStringList being returned.
*/
static already_AddRefed<DOMSVGStringList> GetDOMWrapper(
SVGStringList* aList, dom::SVGElement* aElement,
bool aIsConditionalProcessingAttribute, uint8_t aAttrEnum);
private:
/**
* Only our static GetDOMWrapper() factory method may create objects of our
* type.
*/
DOMSVGStringList(dom::SVGElement* aElement,
bool aIsConditionalProcessingAttribute, uint8_t aAttrEnum)
: mElement(aElement),
mAttrEnum(aAttrEnum),
mIsConditionalProcessingAttribute(aIsConditionalProcessingAttribute) {}
~DOMSVGStringList();
SVGStringList& InternalList() const;
void RemoveFromTearoffTable();
// Strong ref to our element to keep it alive.
RefPtr<dom::SVGElement> mElement;
uint8_t mAttrEnum;
bool mIsConditionalProcessingAttribute;
// Tracks whether we're in the tearoff table. Initialized to true, since all
// new instances are added to the table right after construction. Updated to
// false when we're removed from the table (at which point we're being
// destructed or soon-to-be destructed).
bool mIsInTearoffTable = true;
};
} // namespace dom
} // namespace mozilla
#endif // DOM_SVG_DOMSVGSTRINGLIST_H_
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