/* -*- 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/. */

#include "DOMSVGAnimatedLengthList.h"

#include "DOMSVGLengthList.h"

#include "SVGAnimatedLengthList.h"

#include "nsSVGElement.h"

#include "nsCOMPtr.h"

#include "nsSVGAttrTearoffTable.h"

#include "mozilla/dom/SVGAnimatedLengthListBinding.h"

// See the architecture comment in this file's header.

namespace mozilla {

static inline

nsSVGAttrTearoffTable<SVGAnimatedLengthList, DOMSVGAnimatedLengthList>&

SVGAnimatedLengthListTearoffTable()

{

  static nsSVGAttrTearoffTable<SVGAnimatedLengthList, DOMSVGAnimatedLengthList>

    sSVGAnimatedLengthListTearoffTable;

  return sSVGAnimatedLengthListTearoffTable;

}

NS_SVG_VAL_IMPL_CYCLE_COLLECTION_WRAPPERCACHED(DOMSVGAnimatedLengthList, mElement)

NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(DOMSVGAnimatedLengthList, AddRef)

NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(DOMSVGAnimatedLengthList, Release)

JSObject*

DOMSVGAnimatedLengthList::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)

{

  return dom::SVGAnimatedLengthList_Binding::Wrap(aCx, this, aGivenProto);

}

already_AddRefed<DOMSVGLengthList>

DOMSVGAnimatedLengthList::BaseVal()

{

  if (!mBaseVal) {

    mBaseVal = new DOMSVGLengthList(this, InternalAList().GetBaseValue());

  }

  RefPtr<DOMSVGLengthList> baseVal = mBaseVal;

  return baseVal.forget();

}

already_AddRefed<DOMSVGLengthList>

DOMSVGAnimatedLengthList::AnimVal()

{

  if (!mAnimVal) {

    mAnimVal = new DOMSVGLengthList(this, InternalAList().GetAnimValue());

  }

  RefPtr<DOMSVGLengthList> animVal = mAnimVal;

  return animVal.forget();

}

/* static */ already_AddRefed<DOMSVGAnimatedLengthList>

DOMSVGAnimatedLengthList::GetDOMWrapper(SVGAnimatedLengthList *aList,

                                        nsSVGElement *aElement,

                                        uint8_t aAttrEnum,

                                        uint8_t aAxis)

{

  RefPtr<DOMSVGAnimatedLengthList> wrapper =

    SVGAnimatedLengthListTearoffTable().GetTearoff(aList);

  if (!wrapper) {

    wrapper = new DOMSVGAnimatedLengthList(aElement, aAttrEnum, aAxis);

    SVGAnimatedLengthListTearoffTable().AddTearoff(aList, wrapper);

  }

  return wrapper.forget();

}

/* static */ DOMSVGAnimatedLengthList*

DOMSVGAnimatedLengthList::GetDOMWrapperIfExists(SVGAnimatedLengthList *aList)

{

  return SVGAnimatedLengthListTearoffTable().GetTearoff(aList);

}

DOMSVGAnimatedLengthList::~DOMSVGAnimatedLengthList()

{

  // Script no longer has any references to us, to our base/animVal objects, or

  // to any of their list items.

  SVGAnimatedLengthListTearoffTable().RemoveTearoff(&InternalAList());

}

void

DOMSVGAnimatedLengthList::InternalBaseValListWillChangeTo(const SVGLengthList& aNewValue)

{

  // When the number of items in our internal counterpart's baseVal changes,

  // we MUST keep our baseVal in sync. If we don't, script will either see a

  // list that is too short and be unable to access indexes that should be

  // valid, or else, MUCH WORSE, script will see a list that is too long and be

  // able to access "items" at indexes that are out of bounds (read/write to

  // bad memory)!!

  RefPtr<DOMSVGAnimatedLengthList> kungFuDeathGrip;

  if (mBaseVal) {

    if (aNewValue.Length() < mBaseVal->LengthNoFlush()) {

      // InternalListLengthWillChange might clear last reference to |this|.

      // Retain a temporary reference to keep from dying before returning.

      kungFuDeathGrip = this;

    }

    mBaseVal->InternalListLengthWillChange(aNewValue.Length());

  }

  // If our attribute is not animating, then our animVal mirrors our baseVal

  // and we must sync its length too. (If our attribute is animating, then the

  // SMIL engine takes care of calling InternalAnimValListWillChangeTo() if

  // necessary.)

  if (!IsAnimating()) {

    InternalAnimValListWillChangeTo(aNewValue);

  }

}

void

DOMSVGAnimatedLengthList::InternalAnimValListWillChangeTo(const SVGLengthList& aNewValue)

{

  if (mAnimVal) {

    mAnimVal->InternalListLengthWillChange(aNewValue.Length());

  }

}

bool

DOMSVGAnimatedLengthList::IsAnimating() const

{

  return InternalAList().IsAnimating();

}

SVGAnimatedLengthList&

DOMSVGAnimatedLengthList::InternalAList()

{

  return *mElement->GetAnimatedLengthList(mAttrEnum);

}

const SVGAnimatedLengthList&

DOMSVGAnimatedLengthList::InternalAList() const

{

  return *mElement->GetAnimatedLengthList(mAttrEnum);

}

} // namespace mozilla