EventTree*
EventTree::FindOrInsert(Accessible* aContainer)
{
if (!mFirst) {
mFirst.reset(new EventTree(aContainer, true));
return mFirst.get();
}
EventTree* prevNode = nullptr;
EventTree* node = mFirst.get();
do {
MOZ_ASSERT(!node->mContainer->IsApplication(),
"No event for application accessible is expected here");
MOZ_ASSERT(!node->mContainer->IsDefunct(), "An event target has to be alive");
// Case of same target.
if (node->mContainer == aContainer) {
return node;
}
// Check if the given container is contained by a current node
Accessible* top = mContainer ? mContainer : aContainer->Document();
Accessible* parent = aContainer;
while (parent) {
// Reached a top, no match for a current event.
if (parent == top) {
break;
}
// We got a match.
if (parent->Parent() == node->mContainer) {
return node->FindOrInsert(aContainer);
}
parent = parent->Parent();
MOZ_ASSERT(parent, "Wrong tree");
}
// If the given container contains a current node
// then
// if show or hide of the given node contains a grand parent of the current node
// then ignore the current node and its show and hide events
// otherwise ignore the current node, but not its show and hide events
Accessible* curParent = node->mContainer;
while (curParent && !curParent->IsDoc()) {
if (curParent->Parent() != aContainer) {
curParent = curParent->Parent();
continue;
}
// Insert the tail node into the hierarchy between the current node and
// its parent.
node->mFireReorder = false;
UniquePtr<EventTree>& nodeOwnerRef = prevNode ? prevNode->mNext : mFirst;
UniquePtr<EventTree> newNode(new EventTree(aContainer, mDependentEvents.IsEmpty()));
newNode->mFirst = Move(nodeOwnerRef);
nodeOwnerRef = Move(newNode);
nodeOwnerRef->mNext = Move(node->mNext);
// Check if a next node is contained by the given node too, and move them
// under the given node if so.
prevNode = nodeOwnerRef.get();
node = nodeOwnerRef->mNext.get();
UniquePtr<EventTree>* nodeRef = &nodeOwnerRef->mNext;
EventTree* insNode = nodeOwnerRef->mFirst.get();
while (node) {
Accessible* curParent = node->mContainer;
while (curParent && !curParent->IsDoc()) {
if (curParent->Parent() != aContainer) {
curParent = curParent->Parent();
continue;
}
MOZ_ASSERT(!insNode->mNext);
node->mFireReorder = false;
insNode->mNext = Move(*nodeRef);
insNode = insNode->mNext.get();
prevNode->mNext = Move(node->mNext);
node = prevNode;
break;
}
prevNode = node;
nodeRef = &node->mNext;
node = node->mNext.get();
}
return nodeOwnerRef.get();
}
prevNode = node;
} while ((node = node->mNext.get()));
MOZ_ASSERT(prevNode, "Nowhere to insert");
MOZ_ASSERT(!prevNode->mNext, "Taken by another node");
// If 'this' node contains the given container accessible, then
// do not emit a reorder event for the container
// if a dependent show event target contains the given container then do not
// emit show / hide events (see Process() method)
prevNode->mNext.reset(new EventTree(aContainer, mDependentEvents.IsEmpty()));
return prevNode->mNext.get();
}
EventTree*
EventTree::FindOrInsert(Accessible* aContainer)
{
if (!mFirst) {
mFirst.reset(new EventTree(aContainer, mDependentEvents.IsEmpty()));
return mFirst.get();
}
EventTree* prevNode = nullptr;
EventTree* node = mFirst.get();
do {
MOZ_ASSERT(!node->mContainer->IsApplication(),
"No event for application accessible is expected here");
MOZ_ASSERT(!node->mContainer->IsDefunct(), "An event target has to be alive");
// Case of same target.
if (node->mContainer == aContainer) {
return node;
}
// Check if the given container is contained by a current node
Accessible* top = mContainer ? mContainer : aContainer->Document();
Accessible* parent = aContainer;
while (parent) {
// Reached a top, no match for a current event.
if (parent == top) {
break;
}
// We got a match.
if (parent->Parent() == node->mContainer) {
// Reject the node if it's contained by a show/hide event target
uint32_t evCount = node->mDependentEvents.Length();
for (uint32_t idx = 0; idx < evCount; idx++) {
AccMutationEvent* ev = node->mDependentEvents[idx];
if (ev->GetAccessible() == parent) {
#ifdef A11Y_LOG
if (logging::IsEnabled(logging::eEventTree)) {
logging::MsgBegin("EVENTS_TREE",
"Rejecting node contained by show/hide");
logging::AccessibleInfo("Node", aContainer);
logging::MsgEnd();
}
#endif
// If the node is rejected, then check if it has related hide event
// on stack, and if so, then connect it to the parent show event.
if (ev->IsShow()) {
AccShowEvent* showEv = downcast_accEvent(ev);
Controller(aContainer)->
WithdrawPrecedingEvents(&showEv->mPrecedingEvents);
}
return nullptr;
}
}
return node->FindOrInsert(aContainer);
}
parent = parent->Parent();
MOZ_ASSERT(parent, "Wrong tree");
}
// If the given container contains a current node
// then
// if show or hide of the given node contains a grand parent of the current node
// then ignore the current node and its show and hide events
// otherwise ignore the current node, but not its show and hide events
Accessible* curParent = node->mContainer;
while (curParent && !curParent->IsDoc()) {
if (curParent->Parent() != aContainer) {
curParent = curParent->Parent();
continue;
}
// Insert the tail node into the hierarchy between the current node and
// its parent.
node->mFireReorder = false;
UniquePtr<EventTree>& nodeOwnerRef = prevNode ? prevNode->mNext : mFirst;
UniquePtr<EventTree> newNode(new EventTree(aContainer, mDependentEvents.IsEmpty()));
newNode->mFirst = Move(nodeOwnerRef);
nodeOwnerRef = Move(newNode);
nodeOwnerRef->mNext = Move(node->mNext);
// Check if a next node is contained by the given node too, and move them
// under the given node if so.
prevNode = nodeOwnerRef.get();
node = nodeOwnerRef->mNext.get();
UniquePtr<EventTree>* nodeRef = &nodeOwnerRef->mNext;
EventTree* insNode = nodeOwnerRef->mFirst.get();
while (node) {
Accessible* curParent = node->mContainer;
while (curParent && !curParent->IsDoc()) {
if (curParent->Parent() != aContainer) {
curParent = curParent->Parent();
continue;
}
MOZ_ASSERT(!insNode->mNext);
node->mFireReorder = false;
insNode->mNext = Move(*nodeRef);
insNode = insNode->mNext.get();
prevNode->mNext = Move(node->mNext);
node = prevNode;
break;
}
prevNode = node;
nodeRef = &node->mNext;
node = node->mNext.get();
}
return nodeOwnerRef.get();
}
prevNode = node;
} while ((node = node->mNext.get()));
MOZ_ASSERT(prevNode, "Nowhere to insert");
MOZ_ASSERT(!prevNode->mNext, "Taken by another node");
// If 'this' node contains the given container accessible, then
// do not emit a reorder event for the container
// if a dependent show event target contains the given container then do not
// emit show / hide events (see Process() method)
prevNode->mNext.reset(new EventTree(aContainer, mDependentEvents.IsEmpty()));
return prevNode->mNext.get();
}
