void
EventQueue::ProcessEventQueue()
{
// Process only currently queued events.
nsTArray<RefPtr<AccEvent> > events;
events.SwapElements(mEvents);
uint32_t eventCount = events.Length();
#ifdef A11Y_LOG
if (eventCount > 0 && logging::IsEnabled(logging::eEvents)) {
logging::MsgBegin("EVENTS", "events processing");
logging::Address("document", mDocument);
logging::MsgEnd();
}
#endif
for (uint32_t idx = 0; idx < eventCount; idx++) {
AccEvent* event = events[idx];
if (event->mEventRule != AccEvent::eDoNotEmit) {
Accessible* target = event->GetAccessible();
if (!target || target->IsDefunct())
continue;
// Dispatch the focus event if target is still focused.
if (event->mEventType == nsIAccessibleEvent::EVENT_FOCUS) {
FocusMgr()->ProcessFocusEvent(event);
continue;
}
// Dispatch caret moved and text selection change events.
if (event->mEventType == nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED) {
SelectionMgr()->ProcessTextSelChangeEvent(event);
continue;
}
// Fire selected state change events in support to selection events.
if (event->mEventType == nsIAccessibleEvent::EVENT_SELECTION_ADD) {
nsEventShell::FireEvent(event->mAccessible, states::SELECTED,
true, event->mIsFromUserInput);
} else if (event->mEventType == nsIAccessibleEvent::EVENT_SELECTION_REMOVE) {
nsEventShell::FireEvent(event->mAccessible, states::SELECTED,
false, event->mIsFromUserInput);
} else if (event->mEventType == nsIAccessibleEvent::EVENT_SELECTION) {
AccSelChangeEvent* selChangeEvent = downcast_accEvent(event);
nsEventShell::FireEvent(event->mAccessible, states::SELECTED,
(selChangeEvent->mSelChangeType == AccSelChangeEvent::eSelectionAdd),
event->mIsFromUserInput);
if (selChangeEvent->mPackedEvent) {
nsEventShell::FireEvent(selChangeEvent->mPackedEvent->mAccessible,
states::SELECTED,
(selChangeEvent->mPackedEvent->mSelChangeType == AccSelChangeEvent::eSelectionAdd),
selChangeEvent->mPackedEvent->mIsFromUserInput);
}
}
nsEventShell::FireEvent(event);
}
if (!mDocument)
return;
}
}
void
EventQueue::ProcessEventQueue()
{
// Process only currently queued events.
nsTArray<nsRefPtr<AccEvent> > events;
events.SwapElements(mEvents);
uint32_t eventCount = events.Length();
#ifdef A11Y_LOG
if (eventCount > 0 && logging::IsEnabled(logging::eEvents)) {
logging::MsgBegin("EVENTS", "events processing");
logging::Address("document", mDocument);
logging::MsgEnd();
}
#endif
for (uint32_t idx = 0; idx < eventCount; idx++) {
AccEvent* event = events[idx];
if (event->mEventRule != AccEvent::eDoNotEmit) {
Accessible* target = event->GetAccessible();
if (!target || target->IsDefunct())
continue;
// Dispatch the focus event if target is still focused.
if (event->mEventType == nsIAccessibleEvent::EVENT_FOCUS) {
FocusMgr()->ProcessFocusEvent(event);
continue;
}
// Dispatch caret moved and text selection change events.
if (event->mEventType == nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED) {
AccCaretMoveEvent* caretMoveEvent = downcast_accEvent(event);
HyperTextAccessible* hyperText = target->AsHyperText();
if (hyperText &&
NS_SUCCEEDED(hyperText->GetCaretOffset(&caretMoveEvent->mCaretOffset))) {
nsEventShell::FireEvent(caretMoveEvent);
// There's a selection so fire selection change as well.
int32_t selectionCount;
hyperText->GetSelectionCount(&selectionCount);
if (selectionCount)
nsEventShell::FireEvent(nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED,
hyperText);
}
continue;
}
// Fire selected state change events in support to selection events.
if (event->mEventType == nsIAccessibleEvent::EVENT_SELECTION_ADD) {
nsEventShell::FireEvent(event->mAccessible, states::SELECTED,
true, event->mIsFromUserInput);
} else if (event->mEventType == nsIAccessibleEvent::EVENT_SELECTION_REMOVE) {
nsEventShell::FireEvent(event->mAccessible, states::SELECTED,
false, event->mIsFromUserInput);
} else if (event->mEventType == nsIAccessibleEvent::EVENT_SELECTION) {
AccSelChangeEvent* selChangeEvent = downcast_accEvent(event);
nsEventShell::FireEvent(event->mAccessible, states::SELECTED,
(selChangeEvent->mSelChangeType == AccSelChangeEvent::eSelectionAdd),
event->mIsFromUserInput);
if (selChangeEvent->mPackedEvent) {
nsEventShell::FireEvent(selChangeEvent->mPackedEvent->mAccessible,
states::SELECTED,
(selChangeEvent->mPackedEvent->mSelChangeType == AccSelChangeEvent::eSelectionAdd),
selChangeEvent->mPackedEvent->mIsFromUserInput);
}
}
nsEventShell::FireEvent(event);
// Fire text change events.
AccMutationEvent* mutationEvent = downcast_accEvent(event);
if (mutationEvent) {
if (mutationEvent->mTextChangeEvent)
nsEventShell::FireEvent(mutationEvent->mTextChangeEvent);
}
}
if (event->mEventType == nsIAccessibleEvent::EVENT_HIDE)
mDocument->ShutdownChildrenInSubtree(event->mAccessible);
if (!mDocument)
return;
}
}
void
NotificationController::WillRefresh(mozilla::TimeStamp aTime)
{
// If the document accessible that notification collector was created for is
// now shut down, don't process notifications anymore.
NS_ASSERTION(mDocument,
"The document was shut down while refresh observer is attached!");
if (!mDocument)
return;
// Any generic notifications should be queued if we're processing content
// insertions or generic notifications.
mObservingState = eRefreshProcessingForUpdate;
// Initial accessible tree construction.
if (!mDocument->HasLoadState(nsDocAccessible::eTreeConstructed)) {
// If document is not bound to parent at this point then the document is not
// ready yet (process notifications later).
if (!mDocument->IsBoundToParent()) {
mObservingState = eRefreshObserving;
return;
}
#ifdef DEBUG_NOTIFICATIONS
printf("\ninitial tree created, document: %p, document node: %p\n",
mDocument.get(), mDocument->GetDocumentNode());
#endif
mDocument->DoInitialUpdate();
NS_ASSERTION(mContentInsertions.Length() == 0,
"Pending content insertions while initial accessible tree isn't created!");
}
// Process content inserted notifications to update the tree. Process other
// notifications like DOM events and then flush event queue. If any new
// notifications are queued during this processing then they will be processed
// on next refresh. If notification processing queues up new events then they
// are processed in this refresh. If events processing queues up new events
// then new events are processed on next refresh.
// Note: notification processing or event handling may shut down the owning
// document accessible.
// Process only currently queued content inserted notifications.
nsTArray<nsRefPtr<ContentInsertion> > contentInsertions;
contentInsertions.SwapElements(mContentInsertions);
PRUint32 insertionCount = contentInsertions.Length();
for (PRUint32 idx = 0; idx < insertionCount; idx++) {
contentInsertions[idx]->Process();
if (!mDocument)
return;
}
// Process rendered text change notifications.
mTextHash.EnumerateEntries(TextEnumerator, mDocument);
mTextHash.Clear();
// Bind hanging child documents.
PRUint32 hangingDocCnt = mHangingChildDocuments.Length();
for (PRUint32 idx = 0; idx < hangingDocCnt; idx++) {
nsDocAccessible* childDoc = mHangingChildDocuments[idx];
nsIContent* ownerContent = mDocument->GetDocumentNode()->
FindContentForSubDocument(childDoc->GetDocumentNode());
if (ownerContent) {
nsAccessible* outerDocAcc = mDocument->GetAccessible(ownerContent);
if (outerDocAcc && outerDocAcc->AppendChild(childDoc)) {
if (mDocument->AppendChildDocument(childDoc))
continue;
outerDocAcc->RemoveChild(childDoc);
}
// Failed to bind the child document, destroy it.
childDoc->Shutdown();
}
}
mHangingChildDocuments.Clear();
// If the document is ready and all its subdocuments are completely loaded
// then process the document load.
if (mDocument->HasLoadState(nsDocAccessible::eReady) &&
!mDocument->HasLoadState(nsDocAccessible::eCompletelyLoaded) &&
hangingDocCnt == 0) {
PRUint32 childDocCnt = mDocument->ChildDocumentCount(), childDocIdx = 0;
for (; childDocIdx < childDocCnt; childDocIdx++) {
nsDocAccessible* childDoc = mDocument->GetChildDocumentAt(childDocIdx);
if (!childDoc->HasLoadState(nsDocAccessible::eCompletelyLoaded))
break;
}
if (childDocIdx == childDocCnt) {
mDocument->ProcessLoad();
if (!mDocument)
return;
}
}
// Process only currently queued generic notifications.
nsTArray < nsRefPtr<Notification> > notifications;
notifications.SwapElements(mNotifications);
PRUint32 notificationCount = notifications.Length();
for (PRUint32 idx = 0; idx < notificationCount; idx++) {
notifications[idx]->Process();
if (!mDocument)
return;
}
// Process invalidation list of the document after all accessible tree
// modification are done.
mDocument->ProcessInvalidationList();
// If a generic notification occurs after this point then we may be allowed to
// process it synchronously.
mObservingState = eRefreshObserving;
// Process only currently queued events.
nsTArray<nsRefPtr<AccEvent> > events;
events.SwapElements(mEvents);
PRUint32 eventCount = events.Length();
for (PRUint32 idx = 0; idx < eventCount; idx++) {
AccEvent* accEvent = events[idx];
if (accEvent->mEventRule != AccEvent::eDoNotEmit) {
nsAccessible* target = accEvent->GetAccessible();
if (!target || target->IsDefunct())
continue;
// Dispatch the focus event if target is still focused.
if (accEvent->mEventType == nsIAccessibleEvent::EVENT_FOCUS) {
FocusMgr()->ProcessFocusEvent(accEvent);
continue;
}
mDocument->ProcessPendingEvent(accEvent);
// Fire text change event caused by tree mutation.
AccMutationEvent* showOrHideEvent = downcast_accEvent(accEvent);
if (showOrHideEvent) {
if (showOrHideEvent->mTextChangeEvent)
mDocument->ProcessPendingEvent(showOrHideEvent->mTextChangeEvent);
}
}
if (!mDocument)
return;
}
// Stop further processing if there are no new notifications of any kind or
// events and document load is processed.
if (mContentInsertions.Length() == 0 && mNotifications.Length() == 0 &&
mEvents.Length() == 0 && mTextHash.Count() == 0 &&
mHangingChildDocuments.Length() == 0 &&
mDocument->HasLoadState(nsDocAccessible::eCompletelyLoaded) &&
mPresShell->RemoveRefreshObserver(this, Flush_Display)) {
mObservingState = eNotObservingRefresh;
}
}
