256 lines
9.6 KiB
C++
256 lines
9.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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_DOMSVGPATHSEGLIST_H__
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#define MOZILLA_DOMSVGPATHSEGLIST_H__
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#include "nsCOMPtr.h"
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#include "nsCycleCollectionParticipant.h"
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#include "nsDebug.h"
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#include "nsSVGElement.h"
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#include "nsTArray.h"
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#include "SVGPathData.h" // IWYU pragma: keep
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#include "mozilla/Attributes.h"
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#include "mozilla/ErrorResult.h"
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namespace mozilla {
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class DOMSVGPathSeg;
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class SVGAnimatedPathSegList;
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/**
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* Class DOMSVGPathSegList
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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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* SVGPathData objects.
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*
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* See the architecture comment in DOMSVGAnimatedLengthList.h first (that's
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* LENGTH list), then continue reading the remainder of this comment.
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*
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* The architecture of this class is very similar to that of DOMSVGLengthList
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* except that, since there is no nsIDOMSVGAnimatedPathSegList interface
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* in SVG, we have no parent DOMSVGAnimatedPathSegList (unlike DOMSVGLengthList
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* which has a parent DOMSVGAnimatedLengthList class). (There is an
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* SVGAnimatedPathData interface, but that is quite different to
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* DOMSVGAnimatedLengthList, since it is inherited by elements rather than
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* elements having members of that type.) As a consequence, much of the logic
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* that would otherwise be in DOMSVGAnimatedPathSegList (and is in
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* DOMSVGAnimatedLengthList) is contained in this class.
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*
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* This class is strongly intertwined with DOMSVGPathSeg. Our DOMSVGPathSeg
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* items are friends of us and responsible for nulling out our pointers to
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* them when they die.
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*
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* Our DOM items are created lazily on demand as and when script requests them.
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*/
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class DOMSVGPathSegList final : public nsISupports,
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public nsWrapperCache
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{
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friend class AutoChangePathSegListNotifier;
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friend class DOMSVGPathSeg;
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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(DOMSVGPathSegList)
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virtual JSObject* WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto) override;
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nsISupports* GetParentObject()
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{
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return static_cast<nsIContent*>(mElement);
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}
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/**
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* Factory method to create and return a DOMSVGPathSegList wrapper
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* for a given internal SVGPathData object. The factory takes care
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* of caching the object that it returns so that the same object can be
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* returned for the given SVGPathData 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 SVGPathData will naturally result in a new
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* DOMSVGPathSegList being returned.
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*
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* It's unfortunate that aList is a void* instead of a typed argument. This
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* is because the mBaseVal and mAnimVal members of SVGAnimatedPathSegList are
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* of different types - a plain SVGPathData, and a SVGPathData*. We
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* use the addresses of these members as the key for the hash table, and
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* clearly SVGPathData* and a SVGPathData** are not the same type.
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*/
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static already_AddRefed<DOMSVGPathSegList>
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GetDOMWrapper(void *aList,
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nsSVGElement *aElement,
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bool aIsAnimValList);
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/**
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* This method returns the DOMSVGPathSegList wrapper for an internal
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* SVGPathData 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 DOMSVGPathSegList*
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GetDOMWrapperIfExists(void *aList);
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/**
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* This will normally be the same as InternalList().CountItems(), except if
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* we've hit OOM, in which case our length will be zero.
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*/
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uint32_t LengthNoFlush() const {
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MOZ_ASSERT(mItems.Length() == 0 ||
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mItems.Length() == InternalList().CountItems(),
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"DOM wrapper's list length is out of sync");
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return mItems.Length();
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}
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/**
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* WATCH OUT! If you add code to call this on a baseVal wrapper, then you
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* must also call it on the animVal wrapper too if necessary!! See other
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* callers!
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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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* this DOM list with its internal list. This is called immediately prior to
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* the length of the internal list being changed so that any DOM list items
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* that need to be removed from the DOM list can first copy their values from
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* 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 InternalListWillChangeTo(const SVGPathData& aNewValue);
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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 AttrIsAnimating() const;
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/**
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* Returns true if there is an animated list mirroring the base list.
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*/
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bool AnimListMirrorsBaseList() const;
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uint32_t NumberOfItems() const
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{
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if (IsAnimValList()) {
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Element()->FlushAnimations();
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}
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return LengthNoFlush();
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}
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void Clear(ErrorResult& aError);
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already_AddRefed<DOMSVGPathSeg> Initialize(DOMSVGPathSeg& aNewItem,
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ErrorResult& aError);
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already_AddRefed<DOMSVGPathSeg> GetItem(uint32_t index,
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ErrorResult& error);
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already_AddRefed<DOMSVGPathSeg> IndexedGetter(uint32_t index, bool& found,
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ErrorResult& error);
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already_AddRefed<DOMSVGPathSeg> InsertItemBefore(DOMSVGPathSeg& aNewItem,
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uint32_t aIndex,
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ErrorResult& aError);
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already_AddRefed<DOMSVGPathSeg> ReplaceItem(DOMSVGPathSeg& aNewItem,
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uint32_t aIndex,
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ErrorResult& aError);
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already_AddRefed<DOMSVGPathSeg> RemoveItem(uint32_t aIndex,
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ErrorResult& aError);
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already_AddRefed<DOMSVGPathSeg> AppendItem(DOMSVGPathSeg& aNewItem,
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ErrorResult& aError)
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{
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return InsertItemBefore(aNewItem, LengthNoFlush(), aError);
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}
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uint32_t Length() const
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{
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return NumberOfItems();
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}
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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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DOMSVGPathSegList(nsSVGElement *aElement, bool aIsAnimValList)
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: mElement(aElement)
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, mIsAnimValList(aIsAnimValList)
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{
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InternalListWillChangeTo(InternalList()); // Sync mItems
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}
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~DOMSVGPathSegList();
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nsSVGElement* Element() const {
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return mElement.get();
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}
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/// Used to determine if this list is the baseVal or animVal list.
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bool IsAnimValList() const {
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return mIsAnimValList;
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}
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/**
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* Get a reference to this object's corresponding internal SVGPathData.
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*
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* To simplify the code we just have this one method for obtaining both
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* base val and anim val internal lists. This means that anim val lists don't
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* get const protection, but our setter methods guard against changing
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* anim val lists.
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*/
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SVGPathData& InternalList() const;
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SVGAnimatedPathSegList& InternalAList() const;
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/// Creates an instance of the appropriate DOMSVGPathSeg sub-class for
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// aIndex, if it doesn't already exist, and then returs it.
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already_AddRefed<DOMSVGPathSeg> GetItemAt(uint32_t aIndex);
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void MaybeInsertNullInAnimValListAt(uint32_t aIndex,
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uint32_t aInternalIndex,
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uint32_t aArgCountForItem);
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void MaybeRemoveItemFromAnimValListAt(uint32_t aIndex,
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int32_t aArgCountForItem);
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// Calls UpdateListIndex on all elements in |mItems| that satisfy ItemAt(),
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// from |aStartingIndex| to the end of |mItems|. Also adjusts
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// |mItems.mInternalDataIndex| by the requested amount.
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void UpdateListIndicesFromIndex(uint32_t aStartingIndex,
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int32_t aInternalDataIndexDelta);
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DOMSVGPathSeg*& ItemAt(uint32_t aIndex) {
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return mItems[aIndex].mItem;
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}
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/**
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* This struct is used in our array of mItems to provide us with somewhere to
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* store the indexes into the internal SVGPathData of the internal seg data
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* that our DOMSVGPathSeg items wrap (the internal segment data is or varying
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* length, so we can't just use the index of our DOMSVGPathSeg items
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* themselves). The reason that we have this separate struct rather than
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* just storing the internal indexes in the DOMSVGPathSeg items is because we
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* want to create the DOMSVGPathSeg items lazily on demand.
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*/
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struct ItemProxy {
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ItemProxy(){}
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ItemProxy(DOMSVGPathSeg *aItem, uint32_t aInternalDataIndex)
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: mItem(aItem)
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, mInternalDataIndex(aInternalDataIndex)
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{}
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DOMSVGPathSeg *mItem;
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uint32_t mInternalDataIndex;
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};
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// Weak refs to our DOMSVGPathSeg items. The items are friends and take care
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// of clearing our pointer to them when they die.
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FallibleTArray<ItemProxy> mItems;
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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 DOMSVGPathSeg items too.
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RefPtr<nsSVGElement> mElement;
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bool mIsAnimValList;
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};
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} // namespace mozilla
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#endif // MOZILLA_DOMSVGPATHSEGLIST_H__
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