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Make nodes supports weak references. b=360291 r/sr=jst

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This commit is contained in:
cvshook@sicking.cc
2006-11-11 00:36:03 +00:00
parent ca7989193d
commit 77e21aed80
5 changed files with 123 additions and 2 deletions
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54
content/base/src/nsGenericElement.cpp
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@@ -144,6 +144,10 @@ nsINode::nsSlots::~nsSlots()
mChildNodes->DropReference();
NS_RELEASE(mChildNodes);
}
if (mWeakReference) {
mWeakReference->NoticeNodeDestruction();
}
}
//----------------------------------------------------------------------
@@ -609,6 +613,54 @@ nsNode3Tearoff::IsDefaultNamespace(const nsAString& aNamespaceURI,
return NS_OK;
}
//----------------------------------------------------------------------
NS_IMPL_ISUPPORTS1(nsNodeWeakReference,
nsIWeakReference)
nsNodeWeakReference::~nsNodeWeakReference()
{
if (mNode) {
NS_ASSERTION(mNode->GetSlots() &&
mNode->GetSlots()->mWeakReference == this,
"Weak reference has wrong value");
mNode->GetSlots()->mWeakReference = nsnull;
}
}
NS_IMETHODIMP
nsNodeWeakReference::QueryReferent(const nsIID& aIID, void** aInstancePtr)
{
return mNode ? mNode->QueryInterface(aIID, aInstancePtr) :
NS_ERROR_NULL_POINTER;
}
NS_INTERFACE_MAP_BEGIN(nsNodeSupportsWeakRefTearoff)
NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
NS_INTERFACE_MAP_END_AGGREGATED(mNode)
NS_IMPL_ADDREF(nsNodeSupportsWeakRefTearoff)
NS_IMPL_RELEASE(nsNodeSupportsWeakRefTearoff)
NS_IMETHODIMP
nsNodeSupportsWeakRefTearoff::GetWeakReference(nsIWeakReference** aInstancePtr)
{
nsINode::nsSlots* slots = mNode->GetSlots();
NS_ENSURE_TRUE(slots, NS_ERROR_OUT_OF_MEMORY);
if (!slots->mWeakReference) {
slots->mWeakReference = new nsNodeWeakReference(mNode);
NS_ENSURE_TRUE(slots->mWeakReference, NS_ERROR_OUT_OF_MEMORY);
}
NS_ADDREF(*aInstancePtr = slots->mWeakReference);
return NS_OK;
}
//----------------------------------------------------------------------
nsDOMEventRTTearoff *
nsDOMEventRTTearoff::mCachedEventTearoff[NS_EVENT_TEAROFF_CACHE_SIZE];
@@ -2963,6 +3015,8 @@ NS_INTERFACE_MAP_BEGIN(nsGenericElement)
nsDOMEventRTTearoff::Create(this))
NS_INTERFACE_MAP_ENTRY_TEAROFF(nsIDOMNSEventTarget,
nsDOMEventRTTearoff::Create(this))
NS_INTERFACE_MAP_ENTRY_TEAROFF(nsISupportsWeakReference,
new nsNodeSupportsWeakRefTearoff(this))
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIContent)
NS_INTERFACE_MAP_END