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Bug 1251337 - TreeWalker doesn't have to check ARIA owned children for each DOM state, r=yzen

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This commit is contained in:
Alexander Surkov 2016-02-28 11:30:46 -05:00
parent 06d19d0d14
commit 9ab0baec7f
2 changed files with 40 additions and 73 deletions
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100
accessible/base/TreeWalker.cpp
View File

@ -23,6 +23,7 @@ using namespace mozilla::a11y;
TreeWalker::
TreeWalker(Accessible* aContext) :
mDoc(aContext->Document()), mContext(aContext), mAnchorNode(nullptr),
mARIAOwnsIdx(0),
mChildFilter(nsIContent::eSkipPlaceholderContent), mFlags(0)
{
mChildFilter |= mContext->NoXBLKids() ?
@ -41,9 +42,12 @@ TreeWalker::
TreeWalker::
TreeWalker(Accessible* aContext, nsIContent* aAnchorNode, uint32_t aFlags) :
mDoc(aContext->Document()), mContext(aContext), mAnchorNode(aAnchorNode),
mARIAOwnsIdx(0),
mChildFilter(nsIContent::eSkipPlaceholderContent), mFlags(aFlags)
{
MOZ_ASSERT(aAnchorNode, "No anchor node for the accessible tree walker");
MOZ_ASSERT(mDoc->GetAccessibleOrContainer(aAnchorNode) == mContext,
"Unexpected anchor node was given");
mChildFilter |= mContext->NoXBLKids() ?
nsIContent::eAllButXBL : nsIContent::eAllChildren;
@ -64,29 +68,44 @@ TreeWalker::~TreeWalker()
Accessible*
TreeWalker::Next()
{
if (mStateStack.IsEmpty())
return nullptr;
ChildrenIterator* top = &mStateStack[mStateStack.Length() - 1];
while (top) {
Accessible* child = nullptr;
bool skipSubtree = false;
while (nsIContent* childNode = Next(top, &child, &skipSubtree)) {
if (child)
return child;
// Walk down into subtree to find accessibles.
if (!skipSubtree && childNode->IsElement())
top = PushState(childNode);
if (mStateStack.IsEmpty()) {
return mDoc->ARIAOwnedAt(mContext, mARIAOwnsIdx++);
}
dom::AllChildrenIterator* top = &mStateStack[mStateStack.Length() - 1];
while (top) {
while (nsIContent* childNode = top->GetNextChild()) {
bool skipSubtree = false;
Accessible* child = nullptr;
if (mFlags & eWalkCache) {
child = mDoc->GetAccessible(childNode);
}
else if (mContext->IsAcceptableChild(childNode)) {
child = GetAccService()->
GetOrCreateAccessible(childNode, mContext, &skipSubtree);
}
// Ignore the accessible and its subtree if it was repositioned by means
// of aria-owns.
if (child) {
if (child->IsRelocated()) {
continue;
}
return child;
}
// Walk down into subtree to find accessibles.
if (!skipSubtree && childNode->IsElement()) {
top = PushState(childNode);
}
}
top = PopState();
}
// If we traversed the whole subtree of the anchor node. Move to next node
// relative anchor node within the context subtree if possible.
if (mFlags != eWalkContextTree)
return nullptr;
return Next();
nsINode* contextNode = mContext->GetNode();
while (mAnchorNode != contextNode) {
@ -96,7 +115,7 @@ TreeWalker::Next()
nsIContent* parent = parentNode->AsElement();
top = PushState(parent);
if (top->mDOMIter.Seek(mAnchorNode)) {
if (top->Seek(mAnchorNode)) {
mAnchorNode = parent;
return Next();
}
@ -108,55 +127,10 @@ TreeWalker::Next()
mAnchorNode = parent;
}
return nullptr;
return Next();
}
nsIContent*
TreeWalker::Next(ChildrenIterator* aIter, Accessible** aAccesible,
bool* aSkipSubtree)
{
nsIContent* childEl = aIter->mDOMIter.GetNextChild();
if (!aAccesible)
return childEl;
*aAccesible = nullptr;
*aSkipSubtree = false;
if (childEl) {
Accessible* accessible = nullptr;
if (mFlags & eWalkCache) {
accessible = mDoc->GetAccessible(childEl);
}
else if (mContext->IsAcceptableChild(childEl)) {
accessible = GetAccService()->
GetOrCreateAccessible(childEl, mContext, aSkipSubtree);
}
// Ignore the accessible and its subtree if it was repositioned by means of
// aria-owns.
if (accessible) {
if (accessible->IsRelocated()) {
*aSkipSubtree = true;
} else {
*aAccesible = accessible;
}
}
return childEl;
}
// At last iterate over ARIA owned children.
Accessible* parent = mDoc->GetAccessible(aIter->mDOMIter.Parent());
if (parent) {
Accessible* child = mDoc->ARIAOwnedAt(parent, aIter->mARIAOwnsIdx++);
if (child) {
*aAccesible = child;
return child->GetContent();
}
}
return nullptr;
}
TreeWalker::ChildrenIterator*
dom::AllChildrenIterator*
TreeWalker::PopState()
{
size_t length = mStateStack.Length();

23
accessible/base/TreeWalker.h
View File

@ -63,37 +63,30 @@ private:
TreeWalker(const TreeWalker&);
TreeWalker& operator =(const TreeWalker&);
struct ChildrenIterator {
ChildrenIterator(nsIContent* aNode, uint32_t aFilter) :
mDOMIter(aNode, aFilter), mARIAOwnsIdx(0) { }
dom::AllChildrenIterator mDOMIter;
uint32_t mARIAOwnsIdx;
};
nsIContent* Next(ChildrenIterator* aIter, Accessible** aAccessible = nullptr,
bool* aSkipSubtree = nullptr);
/**
* Create new state for the given node and push it on top of stack.
*
* @note State stack is used to navigate up/down the DOM subtree during
* accessible children search.
*/
ChildrenIterator* PushState(nsIContent* aContent)
dom::AllChildrenIterator* PushState(nsIContent* aContent)
{
return mStateStack.AppendElement(ChildrenIterator(aContent, mChildFilter));
return mStateStack.AppendElement(
dom::AllChildrenIterator(aContent, mChildFilter));
}
/**
* Pop state from stack.
*/
ChildrenIterator* PopState();
dom::AllChildrenIterator* PopState();
DocAccessible* mDoc;
Accessible* mContext;
nsIContent* mAnchorNode;
AutoTArray<ChildrenIterator, 20> mStateStack;
AutoTArray<dom::AllChildrenIterator, 20> mStateStack;
uint32_t mARIAOwnsIdx;
int32_t mChildFilter;
uint32_t mFlags;
};