nsresult
SVGAnimatedTransformList::SetBaseValueString(const nsAString& aValue)
{
SVGTransformList newBaseValue;
nsresult rv = newBaseValue.SetValueFromString(aValue);
if (NS_FAILED(rv)) {
return rv;
}
DOMSVGAnimatedTransformList *domWrapper =
DOMSVGAnimatedTransformList::GetDOMWrapperIfExists(this);
if (domWrapper) {
// We must send this notification *before* changing mBaseVal! If the length
// of our baseVal is being reduced, our baseVal's DOM wrapper list may have
// to remove DOM items from itself, and any removed DOM items need to copy
// their internal counterpart values *before* we change them.
//
domWrapper->InternalBaseValListWillChangeLengthTo(newBaseValue.Length());
}
// We don't need to call DidChange* here - we're only called by
// nsSVGElement::ParseAttribute under Element::SetAttr,
// which takes care of notifying.
rv = mBaseVal.CopyFrom(newBaseValue);
if (NS_FAILED(rv) && domWrapper) {
// Attempting to increase mBaseVal's length failed - reduce domWrapper
// back to the same length:
domWrapper->InternalBaseValListWillChangeLengthTo(mBaseVal.Length());
} else {
mIsAttrSet = true;
}
return rv;
}
void
SVGAnimatedTransformList::ClearBaseValue()
{
DOMSVGAnimatedTransformList *domWrapper =
DOMSVGAnimatedTransformList::GetDOMWrapperIfExists(this);
if (domWrapper) {
// We must send this notification *before* changing mBaseVal! (See above.)
domWrapper->InternalBaseValListWillChangeLengthTo(0);
}
mBaseVal.Clear();
mIsAttrSet = false;
// Caller notifies
}
void
SVGAnimatedTransformList::ClearAnimValue(nsSVGElement *aElement)
{
DOMSVGAnimatedTransformList *domWrapper =
DOMSVGAnimatedTransformList::GetDOMWrapperIfExists(this);
if (domWrapper) {
// When all animation ends, animVal simply mirrors baseVal, which may have
// a different number of items to the last active animated value. We must
// keep the length of our animVal's DOM wrapper list in sync, and again we
// must do that before touching mAnimVal. See comments above.
//
domWrapper->InternalAnimValListWillChangeLengthTo(mBaseVal.Length());
}
mAnimVal = nullptr;
aElement->DidAnimateTransformList();
}
nsresult
SVGAnimatedTransformList::SetAnimValue(const SVGTransformList& aValue,
nsSVGElement *aElement)
{
DOMSVGAnimatedTransformList *domWrapper =
DOMSVGAnimatedTransformList::GetDOMWrapperIfExists(this);
if (domWrapper) {
// A new animation may totally change the number of items in the animVal
// list, replacing what was essentially a mirror of the baseVal list, or
// else replacing and overriding an existing animation. When this happens
// we must try and keep our animVal's DOM wrapper in sync (see the comment
// in DOMSVGAnimatedTransformList::InternalBaseValListWillChangeLengthTo).
//
// It's not possible for us to reliably distinguish between calls to this
// method that are setting a new sample for an existing animation, and
// calls that are setting the first sample of an animation that will
// override an existing animation. Happily it's cheap to just blindly
// notify our animVal's DOM wrapper of its internal counterpart's new value
// each time this method is called, so that's what we do.
//
// Note that we must send this notification *before* setting or changing
// mAnimVal! (See the comment in SetBaseValueString above.)
//
domWrapper->InternalAnimValListWillChangeLengthTo(aValue.Length());
}
if (!mAnimVal) {
mAnimVal = new SVGTransformList();
}
nsresult rv = mAnimVal->CopyFrom(aValue);
if (NS_FAILED(rv)) {
// OOM. We clear the animation, and, importantly, ClearAnimValue() ensures
// that mAnimVal and its DOM wrapper (if any) will have the same length!
ClearAnimValue(aElement);
return rv;
}
aElement->DidAnimateTransformList();
return NS_OK;
}