uint32_t
DocAccessibleParent::AddSubtree(ProxyAccessible* aParent,
const nsTArray<a11y::AccessibleData>& aNewTree,
uint32_t aIdx, uint32_t aIdxInParent)
{
if (aNewTree.Length() <= aIdx) {
NS_ERROR("bad index in serialized tree!");
return 0;
}
const AccessibleData& newChild = aNewTree[aIdx];
if (newChild.Role() > roles::LAST_ROLE) {
NS_ERROR("invalid role");
return 0;
}
if (mAccessibles.Contains(newChild.ID())) {
NS_ERROR("ID already in use");
return 0;
}
auto role = static_cast<a11y::role>(newChild.Role());
ProxyAccessible* newProxy =
new ProxyAccessible(newChild.ID(), aParent, this, role,
newChild.Interfaces());
aParent->AddChildAt(aIdxInParent, newProxy);
mAccessibles.PutEntry(newChild.ID())->mProxy = newProxy;
ProxyCreated(newProxy, newChild.Interfaces());
#if defined(XP_WIN)
WrapperFor(newProxy)->SetID(newChild.MsaaID());
#endif
uint32_t accessibles = 1;
uint32_t kids = newChild.ChildrenCount();
for (uint32_t i = 0; i < kids; i++) {
uint32_t consumed = AddSubtree(newProxy, aNewTree, aIdx + accessibles, i);
if (!consumed)
return 0;
accessibles += consumed;
}
MOZ_ASSERT(newProxy->ChildrenCount() == kids);
return accessibles;
}
bool
DocAccessibleParent::RecvShowEvent(const ShowEventData& aData)
{
if (mShutdown)
return true;
if (aData.NewTree().IsEmpty()) {
NS_ERROR("no children being added");
return false;
}
ProxyAccessible* parent = nullptr;
if (aData.ID()) {
ProxyEntry* e = mAccessibles.GetEntry(aData.ID());
if (e)
parent = e->mProxy;
} else {
parent = this;
}
// XXX This should really never happen, but sometimes we fail to fire the
// required show events.
if (!parent) {
NS_ERROR("adding child to unknown accessible");
return false;
}
uint32_t newChildIdx = aData.Idx();
if (newChildIdx > parent->ChildrenCount()) {
NS_ERROR("invalid index to add child at");
return false;
}
uint32_t consumed = AddSubtree(parent, aData.NewTree(), 0, newChildIdx);
MOZ_ASSERT(consumed == aData.NewTree().Length());
#ifdef DEBUG
for (uint32_t i = 0; i < consumed; i++) {
uint64_t id = aData.NewTree()[i].ID();
MOZ_ASSERT(mAccessibles.GetEntry(id));
}
#endif
return consumed != 0;
}
bool
DocAccessibleParent::RecvShowEvent(const ShowEventData& aData,
const bool& aFromUser)
{
if (mShutdown)
return true;
MOZ_DIAGNOSTIC_ASSERT(CheckDocTree());
if (aData.NewTree().IsEmpty()) {
NS_ERROR("no children being added");
return false;
}
ProxyAccessible* parent = GetAccessible(aData.ID());
// XXX This should really never happen, but sometimes we fail to fire the
// required show events.
if (!parent) {
NS_ERROR("adding child to unknown accessible");
return true;
}
uint32_t newChildIdx = aData.Idx();
if (newChildIdx > parent->ChildrenCount()) {
NS_ERROR("invalid index to add child at");
return true;
}
uint32_t consumed = AddSubtree(parent, aData.NewTree(), 0, newChildIdx);
MOZ_ASSERT(consumed == aData.NewTree().Length());
// XXX This shouldn't happen, but if we failed to add children then the below
// is pointless and can crash.
if (!consumed) {
return true;
}
#ifdef DEBUG
for (uint32_t i = 0; i < consumed; i++) {
uint64_t id = aData.NewTree()[i].ID();
MOZ_ASSERT(mAccessibles.GetEntry(id));
}
#endif
MOZ_DIAGNOSTIC_ASSERT(CheckDocTree());
ProxyAccessible* target = parent->ChildAt(newChildIdx);
ProxyShowHideEvent(target, parent, true, aFromUser);
if (!nsCoreUtils::AccEventObserversExist()) {
return true;
}
uint32_t type = nsIAccessibleEvent::EVENT_SHOW;
xpcAccessibleGeneric* xpcAcc = GetXPCAccessible(target);
xpcAccessibleDocument* doc = GetAccService()->GetXPCDocument(this);
nsIDOMNode* node = nullptr;
RefPtr<xpcAccEvent> event = new xpcAccEvent(type, xpcAcc, doc, node,
aFromUser);
nsCoreUtils::DispatchAccEvent(Move(event));
return true;
}
