gecko-dev/dom/svg/DOMSVGTransformList.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
* 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_DOMSVGTRANSFORMLIST_H__
#define MOZILLA_DOMSVGTRANSFORMLIST_H__
#include "mozilla/dom/SVGAnimatedTransformList.h"
#include "nsAutoPtr.h"
#include "nsCycleCollectionParticipant.h"
#include "nsDebug.h"
#include "nsTArray.h"
#include "SVGTransformList.h"
#include "mozilla/Attributes.h"
#include "mozilla/ErrorResult.h"
class nsSVGElement;
namespace mozilla {
namespace dom {
class SVGMatrix;
class SVGTransform;
}
/**
* Class DOMSVGTransformList
*
* This class is used to create the DOM tearoff objects that wrap internal
* SVGTransformList objects.
*
* See the architecture comment in SVGAnimatedTransformList.h.
*/
class DOMSVGTransformList MOZ_FINAL : public nsISupports,
public nsWrapperCache
{
friend class AutoChangeTransformListNotifier;
friend class dom::SVGTransform;
~DOMSVGTransformList() {
// 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(DOMSVGTransformList)
DOMSVGTransformList(dom::SVGAnimatedTransformList *aAList,
const SVGTransformList &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) MOZ_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 {
NS_ABORT_IF_FALSE(mItems.IsEmpty() ||
mItems.Length() == InternalList().Length(),
"DOM wrapper's list length is out of sync");
return mItems.Length();
}
/// Called to notify us to synchronize 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();
}
uint32_t NumberOfItems() const
{
if (IsAnimValList()) {
Element()->FlushAnimations();
}
return LengthNoFlush();
}
void Clear(ErrorResult& error);
already_AddRefed<dom::SVGTransform> Initialize(dom::SVGTransform& newItem,
ErrorResult& error);
already_AddRefed<dom::SVGTransform> GetItem(uint32_t index,
ErrorResult& error);
already_AddRefed<dom::SVGTransform> IndexedGetter(uint32_t index, bool& found,
ErrorResult& error);
already_AddRefed<dom::SVGTransform> InsertItemBefore(dom::SVGTransform& newItem,
uint32_t index,
ErrorResult& error);
already_AddRefed<dom::SVGTransform> ReplaceItem(dom::SVGTransform& newItem,
uint32_t index,
ErrorResult& error);
already_AddRefed<dom::SVGTransform> RemoveItem(uint32_t index,
ErrorResult& error);
already_AddRefed<dom::SVGTransform> AppendItem(dom::SVGTransform& newItem,
ErrorResult& error)
{
return InsertItemBefore(newItem, LengthNoFlush(), error);
}
already_AddRefed<dom::SVGTransform> CreateSVGTransformFromMatrix(dom::SVGMatrix& matrix);
already_AddRefed<dom::SVGTransform> Consolidate(ErrorResult& error);
uint32_t Length() const
{
return NumberOfItems();
}
private:
nsSVGElement* Element() const {
return mAList->mElement;
}
/// Used to determine if this list is the baseVal or animVal list.
bool IsAnimValList() const {
NS_ABORT_IF_FALSE(this == mAList->mBaseVal || this == mAList->mAnimVal,
"Calling IsAnimValList() too early?!");
return this == mAList->mAnimVal;
}
/**
* Get a reference to this object's corresponding internal SVGTransformList.
*
* 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.
*/
SVGTransformList& InternalList() const;
/// Returns the SVGTransform at aIndex, creating it if necessary.
already_AddRefed<dom::SVGTransform> GetItemAt(uint32_t aIndex);
void MaybeInsertNullInAnimValListAt(uint32_t aIndex);
void MaybeRemoveItemFromAnimValListAt(uint32_t aIndex);
// Weak refs to our SVGTransform items. The items are friends and take care
// of clearing our pointer to them when they die.
FallibleTArray<dom::SVGTransform*> mItems;
nsRefPtr<dom::SVGAnimatedTransformList> mAList;
};
} // namespace mozilla
#endif // MOZILLA_DOMSVGTRANSFORMLIST_H__