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convert MOZ_OVERRIDE override
convert MOZ_FINAL final
132 lines
4.9 KiB
C++
132 lines
4.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
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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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#ifndef mozilla_dom_SVGAnimatedTransformList_h
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#define mozilla_dom_SVGAnimatedTransformList_h
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#include "nsAutoPtr.h"
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#include "nsCOMPtr.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsSVGElement.h"
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#include "nsWrapperCache.h"
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#include "mozilla/Attributes.h"
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namespace mozilla {
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class DOMSVGTransformList;
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class nsSVGAnimatedTransformList;
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namespace dom {
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/**
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* Class SVGAnimatedTransformList
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*
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* This class is used to create the DOM tearoff objects that wrap internal
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* nsSVGAnimatedTransformList objects.
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*
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* See the architecture comment in DOMSVGAnimatedLengthList.h (that's
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* LENGTH list). The comment for that class largly applies to this one too
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* and will go a long way to helping you understand the architecture here.
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*
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* This class is strongly intertwined with DOMSVGTransformList and
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* DOMSVGTransform.
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* Our DOMSVGTransformList base and anim vals are friends and take care of
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* nulling out our pointers to them when they die (making our pointers to them
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* true weak refs).
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*/
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class SVGAnimatedTransformList final : public nsWrapperCache
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{
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friend class mozilla::DOMSVGTransformList;
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public:
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NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(SVGAnimatedTransformList)
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NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(SVGAnimatedTransformList)
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/**
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* Factory method to create and return a SVGAnimatedTransformList wrapper
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* for a given internal nsSVGAnimatedTransformList object. The factory takes
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* care of caching the object that it returns so that the same object can be
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* returned for the given nsSVGAnimatedTransformList each time it is requested.
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* The cached object is only removed from the cache when it is destroyed due
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* to there being no more references to it or to any of its descendant
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* objects. If that happens, any subsequent call requesting the DOM wrapper
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* for the nsSVGAnimatedTransformList will naturally result in a new
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* SVGAnimatedTransformList being returned.
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*/
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static already_AddRefed<SVGAnimatedTransformList>
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GetDOMWrapper(nsSVGAnimatedTransformList *aList, nsSVGElement *aElement);
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/**
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* This method returns the SVGAnimatedTransformList wrapper for an internal
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* nsSVGAnimatedTransformList object if it currently has a wrapper. If it does
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* not, then nullptr is returned.
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*/
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static SVGAnimatedTransformList*
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GetDOMWrapperIfExists(nsSVGAnimatedTransformList *aList);
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/**
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* Called by internal code to notify us when we need to sync the length of
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* our baseVal DOM list with its internal list. This is called just prior to
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* the length of the internal baseVal list being changed so that any DOM list
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* items that need to be removed from the DOM list can first get their values
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* from their internal counterpart.
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*
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* The only time this method could fail is on OOM when trying to increase the
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* length of the DOM list. If that happens then this method simply clears the
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* list and returns. Callers just proceed as normal, and we simply accept
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* that the DOM list will be empty (until successfully set to a new value).
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*/
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void InternalBaseValListWillChangeLengthTo(uint32_t aNewLength);
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void InternalAnimValListWillChangeLengthTo(uint32_t aNewLength);
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/**
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* Returns true if our attribute is animating (in which case our animVal is
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* not simply a mirror of our baseVal).
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*/
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bool IsAnimating() const;
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// WebIDL
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nsSVGElement* GetParentObject() const { return mElement; }
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virtual JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) override;
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// These aren't weak refs because mBaseVal and mAnimVal are weak
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already_AddRefed<DOMSVGTransformList> BaseVal();
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already_AddRefed<DOMSVGTransformList> AnimVal();
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private:
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/**
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* Only our static GetDOMWrapper() factory method may create objects of our
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* type.
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*/
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explicit SVGAnimatedTransformList(nsSVGElement *aElement)
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: mBaseVal(nullptr)
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, mAnimVal(nullptr)
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, mElement(aElement)
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{
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}
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~SVGAnimatedTransformList();
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/// Get a reference to this DOM wrapper object's internal counterpart.
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nsSVGAnimatedTransformList& InternalAList();
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const nsSVGAnimatedTransformList& InternalAList() const;
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// Weak refs to our DOMSVGTransformList baseVal/animVal objects. These objects
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// are friends and take care of clearing these pointers when they die, making
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// these true weak references.
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DOMSVGTransformList *mBaseVal;
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DOMSVGTransformList *mAnimVal;
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// Strong ref to our element to keep it alive. We hold this not only for
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// ourself, but also for our base/animVal and all of their items.
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nsRefPtr<nsSVGElement> mElement;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_SVGAnimatedTransformList_h
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