void
EventQueue::CreateTextChangeEventFor(AccMutationEvent* aEvent)
{
Accessible* container = aEvent->mAccessible->Parent();
if (!container)
return;
HyperTextAccessible* textAccessible = container->AsHyperText();
if (!textAccessible)
return;
// Don't fire event for the first html:br in an editor.
if (aEvent->mAccessible->Role() == roles::WHITESPACE) {
nsCOMPtr<nsIEditor> editor = textAccessible->GetEditor();
if (editor) {
bool isEmpty = false;
editor->GetDocumentIsEmpty(&isEmpty);
if (isEmpty)
return;
}
}
int32_t offset = textAccessible->GetChildOffset(aEvent->mAccessible);
nsAutoString text;
aEvent->mAccessible->AppendTextTo(text);
if (text.IsEmpty())
return;
aEvent->mTextChangeEvent =
new AccTextChangeEvent(textAccessible, offset, text, aEvent->IsShow(),
aEvent->mIsFromUserInput ? eFromUserInput : eNoUserInput);
}
HyperTextAccessible*
DocAccessibleChild::IdToHyperTextAccessible(const uint64_t& aID)
{
Accessible* acc = IdToAccessible(aID);
MOZ_ASSERT(!acc || acc->IsHyperText());
return acc ? acc->AsHyperText() : nullptr;
}
HyperTextAccessible*
nsAccessiblePivot::SearchForText(Accessible* aAccessible, bool aBackward)
{
Accessible* root = GetActiveRoot();
Accessible* accessible = aAccessible;
while (true) {
Accessible* child = nullptr;
while ((child = (aBackward ? accessible->LastChild() :
accessible->FirstChild()))) {
accessible = child;
if (child->IsHyperText())
return child->AsHyperText();
}
Accessible* sibling = nullptr;
Accessible* temp = accessible;
do {
if (temp == root)
break;
if (temp != aAccessible && temp->IsHyperText())
return temp->AsHyperText();
sibling = aBackward ? temp->PrevSibling() : temp->NextSibling();
if (sibling)
break;
} while ((temp = temp->Parent()));
if (!sibling)
break;
accessible = sibling;
if (accessible->IsHyperText())
return accessible->AsHyperText();
}
return nullptr;
}
HyperTextAccessible*
nsAccUtils::GetTextContainer(nsINode* aNode)
{
// Get text accessible containing the result node.
DocAccessible* doc =
GetAccService()->GetDocAccessible(aNode->OwnerDoc());
Accessible* accessible =
doc ? doc->GetAccessibleOrContainer(aNode) : nullptr;
if (!accessible)
return nullptr;
do {
HyperTextAccessible* textAcc = accessible->AsHyperText();
if (textAcc)
return textAcc;
accessible = accessible->Parent();
} while (accessible);
return nullptr;
}
nsresult
HyperTextAccessibleWrap::HandleAccEvent(AccEvent* aEvent)
{
uint32_t eventType = aEvent->GetEventType();
if (eventType == nsIAccessibleEvent::EVENT_TEXT_REMOVED ||
eventType == nsIAccessibleEvent::EVENT_TEXT_INSERTED) {
Accessible* accessible = aEvent->GetAccessible();
if (accessible && accessible->IsHyperText()) {
AccTextChangeEvent* event = downcast_accEvent(aEvent);
HyperTextAccessibleWrap* text =
static_cast<HyperTextAccessibleWrap*>(accessible->AsHyperText());
ia2AccessibleText::UpdateTextChangeData(text, event->IsTextInserted(),
event->ModifiedText(),
event->GetStartOffset(),
event->GetLength());
}
}
return HyperTextAccessible::HandleAccEvent(aEvent);
}
HyperTextAccessible*
nsAccUtils::GetTextAccessibleFromSelection(nsISelection* aSelection)
{
// Get accessible from selection's focus DOM point (the DOM point where
// selection is ended).
nsCOMPtr<nsIDOMNode> focusDOMNode;
aSelection->GetFocusNode(getter_AddRefs(focusDOMNode));
if (!focusDOMNode)
return nullptr;
int32_t focusOffset = 0;
aSelection->GetFocusOffset(&focusOffset);
nsCOMPtr<nsINode> focusNode(do_QueryInterface(focusDOMNode));
nsCOMPtr<nsINode> resultNode =
nsCoreUtils::GetDOMNodeFromDOMPoint(focusNode, focusOffset);
// Get text accessible containing the result node.
DocAccessible* doc =
GetAccService()->GetDocAccessible(resultNode->OwnerDoc());
Accessible* accessible = doc ?
doc->GetAccessibleOrContainer(resultNode) : nullptr;
if (!accessible) {
NS_NOTREACHED("No nsIAccessibleText for selection change event!");
return nullptr;
}
do {
HyperTextAccessible* textAcc = accessible->AsHyperText();
if (textAcc)
return textAcc;
accessible = accessible->Parent();
} while (accessible);
NS_NOTREACHED("We must reach document accessible implementing nsIAccessibleText!");
return nullptr;
}
NS_IMETHODIMP
nsAccessiblePivot::MovePreviousByText(TextBoundaryType aBoundary, bool* aResult)
{
NS_ENSURE_ARG(aResult);
*aResult = false;
int32_t tempStart = mStartOffset, tempEnd = mEndOffset;
Accessible* tempPosition = mPosition;
Accessible* root = GetActiveRoot();
while (true) {
Accessible* curPosition = tempPosition;
HyperTextAccessible* text;
// Find the nearest text node using a reverse preorder traversal starting
// from the current node.
if (!(text = tempPosition->AsHyperText())) {
text = SearchForText(tempPosition, true);
if (!text)
return NS_OK;
if (text != curPosition)
tempStart = tempEnd = -1;
tempPosition = text;
}
// If the search led to the parent of the node we started on (e.g. when
// starting on a text leaf), start the text movement from the end of that
// node, otherwise we just default to 0.
if (tempStart == -1) {
if (tempPosition != curPosition)
tempStart = text == curPosition->Parent() ?
text->GetChildOffset(curPosition) : text->CharacterCount();
else
tempStart = 0;
}
// If there's no more text on the current node, try to find the previous
// text node; if there isn't one, bail out.
if (tempStart == 0) {
if (tempPosition == root)
return NS_OK;
// If we're currently sitting on a link, try move to either the previous
// sibling or the parent, whichever is closer to the current end
// offset. Otherwise, do a forward search for the next node to land on
// (we don't do this in the first case because we don't want to go to the
// subtree).
Accessible* sibling = tempPosition->PrevSibling();
if (tempPosition->IsLink()) {
if (sibling && sibling->IsLink()) {
HyperTextAccessible* siblingText = sibling->AsHyperText();
tempStart = tempEnd = siblingText ?
siblingText->CharacterCount() : -1;
tempPosition = sibling;
} else {
tempStart = tempPosition->StartOffset();
tempEnd = tempPosition->EndOffset();
tempPosition = tempPosition->Parent();
}
} else {
HyperTextAccessible* tempText = SearchForText(tempPosition, true);
if (!tempText)
return NS_OK;
tempPosition = tempText;
tempStart = tempEnd = tempText->CharacterCount();
}
continue;
}
AccessibleTextBoundary startBoundary, endBoundary;
switch (aBoundary) {
case CHAR_BOUNDARY:
startBoundary = nsIAccessibleText::BOUNDARY_CHAR;
endBoundary = nsIAccessibleText::BOUNDARY_CHAR;
break;
case WORD_BOUNDARY:
startBoundary = nsIAccessibleText::BOUNDARY_WORD_START;
endBoundary = nsIAccessibleText::BOUNDARY_WORD_END;
break;
default:
return NS_ERROR_INVALID_ARG;
}
nsAutoString unusedText;
int32_t newStart = 0, newEnd = 0, currentStart = tempStart, potentialEnd = 0;
text->TextBeforeOffset(tempStart, startBoundary, &newStart, &newEnd, unusedText);
if (newStart < tempStart)
tempStart = newEnd >= currentStart ? newStart : newEnd;
else // XXX: In certain odd cases newStart is equal to tempStart
text->TextBeforeOffset(tempStart - 1, startBoundary, &newStart,
&tempStart, unusedText);
text->TextAtOffset(tempStart, endBoundary, &newStart, &potentialEnd,
unusedText);
tempEnd = potentialEnd < tempEnd ? potentialEnd : currentStart;
// The offset range we've obtained might have embedded characters in it,
// limit the range to the start of the last occurrence of an embedded
// character.
Accessible* childAtOffset = nullptr;
for (int32_t i = tempEnd - 1; i >= tempStart; i--) {
childAtOffset = text->GetChildAtOffset(i);
if (childAtOffset && nsAccUtils::IsEmbeddedObject(childAtOffset)) {
tempStart = childAtOffset->EndOffset();
break;
}
}
// If there's an embedded character at the very end of the range, we
// instead want to traverse into it. So restart the movement with
// the child as the starting point.
if (childAtOffset && nsAccUtils::IsEmbeddedObject(childAtOffset) &&
tempEnd == static_cast<int32_t>(childAtOffset->EndOffset())) {
tempPosition = childAtOffset;
tempStart = tempEnd = childAtOffset->AsHyperText()->CharacterCount();
continue;
}
*aResult = true;
Accessible* startPosition = mPosition;
int32_t oldStart = mStartOffset, oldEnd = mEndOffset;
mPosition = tempPosition;
mStartOffset = tempStart;
mEndOffset = tempEnd;
NotifyOfPivotChange(startPosition, oldStart, oldEnd,
nsIAccessiblePivot::REASON_TEXT);
return NS_OK;
}
}
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;
}
}
