mozilla::ipc::IPCResult DocAccessibleParent::RecvShowEvent(const ShowEventData& aData, const bool& aFromUser) { if (mShutdown) return IPC_OK(); MOZ_ASSERT(CheckDocTree()); if (aData.NewTree().IsEmpty()) { NS_ERROR("no children being added"); return IPC_FAIL_NO_REASON(this); } 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"); #ifdef DEBUG return IPC_FAIL(this, "unknown parent accessible"); #else return IPC_OK(); #endif } uint32_t newChildIdx = aData.Idx(); if (newChildIdx > parent->ChildrenCount()) { NS_ERROR("invalid index to add child at"); #ifdef DEBUG return IPC_FAIL(this, "invalid index"); #else return IPC_OK(); #endif } 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 IPC_FAIL(this, "failed to add children"); } #ifdef DEBUG for (uint32_t i = 0; i < consumed; i++) { uint64_t id = aData.NewTree()[i].ID(); MOZ_ASSERT(mAccessibles.GetEntry(id)); } #endif MOZ_ASSERT(CheckDocTree()); ProxyAccessible* target = parent->ChildAt(newChildIdx); ProxyShowHideEvent(target, parent, true, aFromUser); if (!nsCoreUtils::AccEventObserversExist()) { return IPC_OK(); } 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 IPC_OK(); }