View source for Layout:IntersectionObserver

<big><big>'''Lifetime (as in FF < 58)'''</big></big>

[[File:Intersection observer lifetime.png|thumbnail]]

<big>'''Linking steps:'''</big>

''DOMIntersectionObserver::observe(Element& aTarget)'' adds ''aTarget'' to ''DOMIntersectionObserver::mObservationTargets'' and calls ''Element::RegisterIntersectionObsever'' on ''aTarget''. If ''aTarget'' is the first item in ''DOMIntersectionObserver::mObservationTargets'', ''nsDocument::AddIntersectionObserver'' is called and the observer gets added to ''nsDocument::mIntersectionObservers''.

''Element::RegisterIntersectionObserver(DOMIntersectionObserver* aObserver)'' adds ''aObserver'' to ''mSlots::mRegisteredIntersectionObservers''.

<big>'''Unlinking steps:'''</big>

''DOMIntersectionObserver::unobserve(Element& aTarget)'' removes aTarget from ''DOMIntersectionObserver::mObservationTargets'' and calls ''Element::UnregisterIntersectionObsever'' on ''aTarget''. If aTarget is the last item in ''DOMIntersectionObserver::mObservationTargets'', ''nsDocument::RemoveIntersectionObserver'' is called and the observer gets removed from ''nsDocument::mIntersectionObservers''.

''DOMIntersectionObserver::Disconnect()'' calls ''Element::UnregisterIntersectionObsever'' for every item in ''DOMIntersectionObserver::mObservationTargets''.

''Element::UnregisterIntersectionObserver(DOMIntersectionObserver* aObserver)'' removes ''aObserver'' from ''mSlots::mRegisteredIntersectionObservers''.

''DOMIntersectionObserver::~DOMIntersectionObserver'' calls ''DOMIntersectionObserver::Disconnect()''.

''DOMIntersectionObserver::Unlink'' calls ''DOMIntersectionObserver::Disconnect()''.

''nsNodeUtils::LastRelease'' calls ''DOMIntersectionObserver::UnlinkTarget'' for every observer in 
''nsSlots::mRegisteredIntersectionObservers''.

''nsDomSlots::Unlink'' calls ''DOMIntersectionObserver::UnlinkTarget'' for every observer in 
''nsSlots::mRegisteredIntersectionObservers''.

<big><big>'''Lifetime (as in FF >= 58)'''</big></big>

''DOMIntersectionObserver::observe(Element& aTarget)'' adds ''aTarget'' to ''DOMIntersectionObserver::mObservationTargets'' and calls ''Element::RegisterIntersectionObsever'' on ''aTarget''. If ''aTarget'' is the first item in ''DOMIntersectionObserver::mObservationTargets'', ''nsDocument::AddIntersectionObserver'' is called and the observer gets added to ''nsDocument::mIntersectionObservers''.

''Element::RegisterIntersectionObserver(DOMIntersectionObserver* aObserver)'' adds ''aObserver'' to ''Property(nsGkAtoms::intersectionobserverlist)''.

<big>'''Unlinking steps:'''</big>

''DOMIntersectionObserver::unobserve(Element& aTarget)'' removes aTarget from ''DOMIntersectionObserver::mObservationTargets'' and calls ''Element::UnregisterIntersectionObsever'' on ''aTarget''. If aTarget is the last item in ''DOMIntersectionObserver::mObservationTargets'', ''nsDocument::RemoveIntersectionObserver'' is called and the observer gets removed from ''nsDocument::mIntersectionObservers''.

''DOMIntersectionObserver::Disconnect()'' calls ''Element::UnregisterIntersectionObsever'' for every item in ''DOMIntersectionObserver::mObservationTargets''.

''Element::UnregisterIntersectionObserver(DOMIntersectionObserver* aObserver)'' removes ''aObserver'' from ''Property(nsGkAtoms::intersectionobserverlist)''.

''DOMIntersectionObserver::~DOMIntersectionObserver'' calls ''DOMIntersectionObserver::Disconnect()''.

''DOMIntersectionObserver::Unlink'' calls ''DOMIntersectionObserver::Disconnect()''.

''nsNodeUtils::LastRelease'' calls ''DOMIntersectionObserver::UnlinkElement'' for every observer in 
''nsSlots::mRegisteredIntersectionObservers''.

''nsDomSlots::Unlink'' calls ''DOMIntersectionObserver::UnlinkElement'' for every observer in 
''nsSlots::mRegisteredIntersectionObservers''.