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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 MOZILLA_DOMSVGLENGTHLIST_H__
#define MOZILLA_DOMSVGLENGTHLIST_H__
#include "DOMSVGAnimatedLengthList.h"
#include "nsCycleCollectionParticipant.h"
#include "nsDebug.h"
#include "nsTArray.h"
#include "SVGLengthList.h"
#include "mozilla/Attributes.h"
#include "mozilla/ErrorResult.h"
class nsSVGElement;
namespace mozilla {
class DOMSVGLength;
/**
* Class DOMSVGLengthList
*
* This class is used to create the DOM tearoff objects that wrap internal
* SVGLengthList objects.
*
* See the architecture comment in DOMSVGAnimatedLengthList.h.
*
* This class is strongly intertwined with DOMSVGAnimatedLengthList and
* DOMSVGLength. We are a friend of DOMSVGAnimatedLengthList, and are
* responsible for nulling out our DOMSVGAnimatedLengthList's pointer to us
* when we die, essentially making its pointer to us a weak pointer. Similarly,
* our DOMSVGLength items are friends of us and responsible for nulling out our
* pointers to them.
*
* Our DOM items are created lazily on demand as and when script requests them.
*/
class DOMSVGLengthList final : public nsISupports,
public nsWrapperCache
{
friend class AutoChangeLengthListNotifier;
friend class DOMSVGLength;
~DOMSVGLengthList() {
// Our mAList's weak ref to us must be nulled out when we die. If GC has
// unlinked us using the cycle collector code, then that has already
// happened, and mAList is null.
if (mAList) {
( IsAnimValList() ? mAList->mAnimVal : mAList->mBaseVal ) = nullptr;
}
}
public:
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(DOMSVGLengthList)
DOMSVGLengthList(DOMSVGAnimatedLengthList *aAList,
const SVGLengthList &aInternalList)
: mAList(aAList)
{
// aInternalList must be passed in explicitly because we can't use
// InternalList() here. (Because it depends on IsAnimValList, which depends
// on this object having been assigned to aAList's mBaseVal or mAnimVal,
// which hasn't happend yet.)
InternalListLengthWillChange(aInternalList.Length()); // Sync mItems
}
virtual JSObject* WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto) override;
nsISupports* GetParentObject()
{
return static_cast<nsIContent*>(Element());
}
/**
* This will normally be the same as InternalList().Length(), except if we've
* hit OOM in which case our length will be zero.
*/
uint32_t LengthNoFlush() const {
MOZ_ASSERT(mItems.Length() == 0 ||
mItems.Length() == InternalList().Length(),
"DOM wrapper's list length is out of sync");
return mItems.Length();
}
/// Called to notify us to syncronize our length and detach excess items.
void InternalListLengthWillChange(uint32_t aNewLength);
/**
* Returns true if our attribute is animating (in which case our animVal is
* not simply a mirror of our baseVal).
*/
bool IsAnimating() const {
return mAList->IsAnimating();
}
/**
* Returns true if there is an animated list mirroring the base list.
*/
bool AnimListMirrorsBaseList() const {
return mAList->mAnimVal && !mAList->IsAnimating();
}
uint32_t NumberOfItems() const
{
if (IsAnimValList()) {
Element()->FlushAnimations();
}
return LengthNoFlush();
}
void Clear(ErrorResult& aError);
already_AddRefed<DOMSVGLength> Initialize(DOMSVGLength& newItem,
ErrorResult& error);
already_AddRefed<DOMSVGLength> GetItem(uint32_t index,
ErrorResult& error);
already_AddRefed<DOMSVGLength> IndexedGetter(uint32_t index, bool& found,
ErrorResult& error);
already_AddRefed<DOMSVGLength> InsertItemBefore(DOMSVGLength& newItem,
uint32_t index,
ErrorResult& error);
already_AddRefed<DOMSVGLength> ReplaceItem(DOMSVGLength& newItem,
uint32_t index,
ErrorResult& error);
already_AddRefed<DOMSVGLength> RemoveItem(uint32_t index,
ErrorResult& error);
already_AddRefed<DOMSVGLength> AppendItem(DOMSVGLength& newItem,
ErrorResult& error)
{
return InsertItemBefore(newItem, LengthNoFlush(), error);
}
uint32_t Length() const
{
return NumberOfItems();
}
private:
nsSVGElement* Element() const {
return mAList->mElement;
}
uint8_t AttrEnum() const {
return mAList->mAttrEnum;
}
uint8_t Axis() const {
return mAList->mAxis;
}
/// Used to determine if this list is the baseVal or animVal list.
bool IsAnimValList() const {
MOZ_ASSERT(this == mAList->mBaseVal || this == mAList->mAnimVal,
"Calling IsAnimValList() too early?!");
return this == mAList->mAnimVal;
}
/**
* Get a reference to this object's corresponding internal SVGLengthList.
*
* To simplify the code we just have this one method for obtaining both
* baseVal and animVal internal lists. This means that animVal lists don't
* get const protection, but our setter methods guard against changing
* animVal lists.
*/
SVGLengthList& InternalList() const;
/// Returns the DOMSVGLength at aIndex, creating it if necessary.
already_AddRefed<DOMSVGLength> GetItemAt(uint32_t aIndex);
void MaybeInsertNullInAnimValListAt(uint32_t aIndex);
void MaybeRemoveItemFromAnimValListAt(uint32_t aIndex);
// Weak refs to our DOMSVGLength items. The items are friends and take care
// of clearing our pointer to them when they die.
FallibleTArray<DOMSVGLength*> mItems;
RefPtr<DOMSVGAnimatedLengthList> mAList;
};
} // namespace mozilla
#endif // MOZILLA_DOMSVGLENGTHLIST_H__
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