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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/. */
#include "DOMSVGNumber.h"
#include "DOMSVGNumberList.h"
#include "DOMSVGAnimatedNumberList.h"
#include "SVGAnimatedNumberList.h"
#include "nsSVGElement.h"
#include "nsError.h"
#include "nsContentUtils.h" // for NS_ENSURE_FINITE
#include "mozilla/dom/SVGNumberBinding.h"
// See the architecture comment in DOMSVGAnimatedNumberList.h.
namespace mozilla {
// We could use NS_IMPL_CYCLE_COLLECTION(, except that in Unlink() we need to
// clear our list's weak ref to us to be safe. (The other option would be to
// not unlink and rely on the breaking of the other edges in the cycle, as
// NS_SVG_VAL_IMPL_CYCLE_COLLECTION does.)
NS_IMPL_CYCLE_COLLECTION_CLASS(DOMSVGNumber)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMSVGNumber)
// We may not belong to a list, so we must null check tmp->mList.
if (tmp->mList) {
tmp->mList->mItems[tmp->mListIndex] = nullptr;
}
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK(mList)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(DOMSVGNumber)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mList)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMSVGNumber)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMSVGNumber)
NS_IMPL_CYCLE_COLLECTING_RELEASE(DOMSVGNumber)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMSVGNumber)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
//----------------------------------------------------------------------
// Helper class: AutoChangeNumberNotifier
// Stack-based helper class to pair calls to WillChangeNumberList and
// DidChangeNumberList.
class MOZ_RAII AutoChangeNumberNotifier
{
public:
explicit AutoChangeNumberNotifier(DOMSVGNumber* aNumber MOZ_GUARD_OBJECT_NOTIFIER_PARAM)
: mNumber(aNumber)
{
MOZ_GUARD_OBJECT_NOTIFIER_INIT;
MOZ_ASSERT(mNumber, "Expecting non-null number");
MOZ_ASSERT(mNumber->HasOwner(),
"Expecting list to have an owner for notification");
mEmptyOrOldValue =
mNumber->Element()->WillChangeNumberList(mNumber->mAttrEnum);
}
~AutoChangeNumberNotifier()
{
mNumber->Element()->DidChangeNumberList(mNumber->mAttrEnum,
mEmptyOrOldValue);
if (mNumber->mList->IsAnimating()) {
mNumber->Element()->AnimationNeedsResample();
}
}
private:
DOMSVGNumber* const mNumber;
nsAttrValue mEmptyOrOldValue;
MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER
};
DOMSVGNumber::DOMSVGNumber(DOMSVGNumberList *aList,
uint8_t aAttrEnum,
uint32_t aListIndex,
bool aIsAnimValItem)
: mList(aList)
, mParent(aList)
, mListIndex(aListIndex)
, mAttrEnum(aAttrEnum)
, mIsAnimValItem(aIsAnimValItem)
, mValue(0.0f)
{
// These shifts are in sync with the members in the header.
MOZ_ASSERT(aList &&
aAttrEnum < (1 << 4) &&
aListIndex <= MaxListIndex(),
"bad arg");
MOZ_ASSERT(IndexIsValid(), "Bad index for DOMSVGNumber!");
}
DOMSVGNumber::DOMSVGNumber(nsISupports* aParent)
: mList(nullptr)
, mParent(aParent)
, mListIndex(0)
, mAttrEnum(0)
, mIsAnimValItem(false)
, mValue(0.0f)
{
}
/* static */ already_AddRefed<DOMSVGNumber>
DOMSVGNumber::Constructor(const dom::GlobalObject& aGlobal, ErrorResult& aRv)
{
nsCOMPtr<nsPIDOMWindowInner> window =
do_QueryInterface(aGlobal.GetAsSupports());
if (!window) {
aRv.Throw(NS_ERROR_UNEXPECTED);
return nullptr;
}
RefPtr<DOMSVGNumber> number = new DOMSVGNumber(window);
return number.forget();
}
/* static */ already_AddRefed<DOMSVGNumber>
DOMSVGNumber::Constructor(const dom::GlobalObject& aGlobal, float aValue,
ErrorResult& aRv)
{
nsCOMPtr<nsPIDOMWindowInner> window =
do_QueryInterface(aGlobal.GetAsSupports());
if (!window) {
aRv.Throw(NS_ERROR_UNEXPECTED);
return nullptr;
}
RefPtr<DOMSVGNumber> number = new DOMSVGNumber(window);
number->SetValue(aValue, aRv);
return number.forget();
}
float
DOMSVGNumber::Value()
{
if (mIsAnimValItem && HasOwner()) {
Element()->FlushAnimations(); // May make HasOwner() == false
}
return HasOwner() ? InternalItem() : mValue;
}
void
DOMSVGNumber::SetValue(float aValue, ErrorResult& aRv)
{
if (mIsAnimValItem) {
aRv.Throw(NS_ERROR_DOM_NO_MODIFICATION_ALLOWED_ERR);
return;
}
if (HasOwner()) {
if (InternalItem() == aValue) {
return;
}
AutoChangeNumberNotifier notifier(this);
InternalItem() = aValue;
return;
}
mValue = aValue;
}
void
DOMSVGNumber::InsertingIntoList(DOMSVGNumberList *aList,
uint8_t aAttrEnum,
uint32_t aListIndex,
bool aIsAnimValItem)
{
NS_ASSERTION(!HasOwner(), "Inserting item that is already in a list");
mList = aList;
mAttrEnum = aAttrEnum;
mListIndex = aListIndex;
mIsAnimValItem = aIsAnimValItem;
MOZ_ASSERT(IndexIsValid(), "Bad index for DOMSVGNumber!");
}
void
DOMSVGNumber::RemovingFromList()
{
mValue = InternalItem();
mList = nullptr;
mIsAnimValItem = false;
}
float
DOMSVGNumber::ToSVGNumber()
{
return HasOwner() ? InternalItem() : mValue;
}
float&
DOMSVGNumber::InternalItem()
{
SVGAnimatedNumberList *alist = Element()->GetAnimatedNumberList(mAttrEnum);
return mIsAnimValItem && alist->mAnimVal ?
(*alist->mAnimVal)[mListIndex] :
alist->mBaseVal[mListIndex];
}
#ifdef DEBUG
bool
DOMSVGNumber::IndexIsValid()
{
SVGAnimatedNumberList *alist = Element()->GetAnimatedNumberList(mAttrEnum);
return (mIsAnimValItem &&
mListIndex < alist->GetAnimValue().Length()) ||
(!mIsAnimValItem &&
mListIndex < alist->GetBaseValue().Length());
}
#endif
JSObject*
DOMSVGNumber::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return dom::SVGNumberBinding::Wrap(aCx, this, aGivenProto);
}
} // namespace mozilla
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