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