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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/. */
#pragma once
#include "nsCycleCollectionParticipant.h"
#include "nsWrapperCache.h"
#include "mozilla/dom/SVGPointBinding.h"
#include "DOMSVGPointList.h"
// {d6b6c440-af8d-40ee-856b-02a317cab275}
#define MOZILLA_NSISVGPOINT_IID \
{ 0xd6b6c440, 0xaf8d, 0x40ee, \
{ 0x85, 0x6b, 0x02, 0xa3, 0x17, 0xca, 0xb2, 0x75 } }
#define MOZ_SVG_LIST_INDEX_BIT_COUNT 29
namespace mozilla {
namespace dom {
class SVGMatrix;
} // namespace dom
/**
* Class nsISVGPoint
*
* This class creates the DOM objects that wrap internal SVGPoint objects.
* An nsISVGPoint can be either a DOMSVGPoint or a DOMSVGTranslatePoint
*/
class nsISVGPoint : public nsISupports,
public nsWrapperCache
{
public:
NS_DECLARE_STATIC_IID_ACCESSOR(MOZILLA_NSISVGPOINT_IID)
NS_DECL_CYCLE_COLLECTING_ISUPPORTS
NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS(nsISVGPoint)
/**
* Generic ctor for DOMSVGPoint objects that are created for an attribute.
*/
explicit nsISVGPoint()
: mList(nullptr)
, mListIndex(0)
, mIsReadonly(false)
, mIsAnimValItem(false)
, mIsTranslatePoint(false)
{
}
explicit nsISVGPoint(SVGPoint* aPt, bool aIsTranslatePoint)
: mList(nullptr)
, mListIndex(0)
, mIsReadonly(false)
, mIsAnimValItem(false)
, mIsTranslatePoint(aIsTranslatePoint)
{
mPt.mX = aPt->GetX();
mPt.mY = aPt->GetY();
}
protected:
virtual ~nsISVGPoint()
{
// Our mList'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 mList is null.
if (mList) {
mList->mItems[mListIndex] = nullptr;
}
}
public:
/**
* Creates an unowned copy of this object's point as a DOMSVGPoint.
*/
virtual DOMSVGPoint* Copy() = 0;
SVGPoint ToSVGPoint() const {
return HasOwner() ? const_cast<nsISVGPoint*>(this)->InternalItem() : mPt;
}
bool IsInList() const {
return !!mList;
}
/**
* In future, if this class is used for non-list points, this will be
* different to IsInList(). "Owner" here means that the instance has an
* internal counterpart from which it gets its values. (A better name may
* be HasWrappee().)
*/
bool HasOwner() const {
return !!mList;
}
bool IsTranslatePoint() const {
return mIsTranslatePoint;
}
/**
* This method is called to notify this DOM object that it is being inserted
* into a list, and give it the information it needs as a result.
*
* This object MUST NOT already belong to a list when this method is called.
* That's not to say that script can't move these DOM objects between
* lists - it can - it's just that the logic to handle that (and send out
* the necessary notifications) is located elsewhere (in DOMSVGPointList).)
*/
void InsertingIntoList(DOMSVGPointList *aList,
uint32_t aListIndex,
bool aIsAnimValItem);
static uint32_t MaxListIndex() {
return (1U << MOZ_SVG_LIST_INDEX_BIT_COUNT) - 1;
}
/// This method is called to notify this object that its list index changed.
void UpdateListIndex(uint32_t aListIndex) {
mListIndex = aListIndex;
}
/**
* This method is called to notify this DOM object that it is about to be
* removed from its current DOM list so that it can first make a copy of its
* internal counterpart's values. (If it didn't do this, then it would
* "lose" its value on being removed.)
*/
void RemovingFromList();
bool IsReadonly() const {
return mIsReadonly;
}
void SetReadonly(bool aReadonly) {
mIsReadonly = aReadonly;
}
// WebIDL
virtual float X() = 0;
virtual void SetX(float aX, ErrorResult& rv) = 0;
virtual float Y() = 0;
virtual void SetY(float aY, ErrorResult& rv) = 0;
virtual already_AddRefed<nsISVGPoint> MatrixTransform(dom::SVGMatrix& matrix) = 0;
virtual JSObject* WrapObject(JSContext *cx, JS::Handle<JSObject*> aGivenProto) override
{ return dom::SVGPointBinding::Wrap(cx, this, aGivenProto); }
virtual nsISupports* GetParentObject() = 0;
protected:
#ifdef DEBUG
bool IndexIsValid();
#endif
RefPtr<DOMSVGPointList> mList;
// Bounds for the following are checked in the ctor, so be sure to update
// that if you change the capacity of any of the following.
uint32_t mListIndex:MOZ_SVG_LIST_INDEX_BIT_COUNT;
uint32_t mIsReadonly:1; // These flags are uint32_t because MSVC won't
uint32_t mIsAnimValItem:1; // pack otherwise.
uint32_t mIsTranslatePoint:1;
/**
* Get a reference to the internal SVGPoint list item that this DOM wrapper
* object currently wraps.
*
* To simplify the code we just have this one method for obtaining both
* baseVal and animVal internal items. This means that animVal items don't
* get const protection, but then our setter methods guard against changing
* animVal items.
*/
SVGPoint& InternalItem();
// The following member is only used when we're not in a list:
SVGPoint mPt;
};
NS_DEFINE_STATIC_IID_ACCESSOR(nsISVGPoint, MOZILLA_NSISVGPOINT_IID)
} // namespace mozilla
#undef MOZ_SVG_LIST_INDEX_BIT_COUNT
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