зеркало из https://github.com/mozilla/gecko-dev.git
Added generated content iterator
This commit is contained in:
troy%netscape.com
Родитель
7dd37e5b9c
Коммит
d82789f57c
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@ -652,13 +652,290 @@ GetChildListNameFor(nsIPresContext* aPresContext,
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*aListName = listName;
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}
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class GeneratedContentIterator : public nsIContentIterator
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{
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public:
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GeneratedContentIterator(nsIPresContext* aPresContext, nsIFrame* aFrame);
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virtual ~GeneratedContentIterator();
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// nsISupports
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NS_DECL_ISUPPORTS
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// nsIContentIterator
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NS_IMETHOD Init(nsIContent* aRoot);
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NS_IMETHOD Init(nsIDOMRange* aRange);
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NS_IMETHOD First();
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NS_IMETHOD Last();
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NS_IMETHOD Next();
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NS_IMETHOD Prev();
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NS_IMETHOD CurrentNode(nsIContent **aNode);
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NS_IMETHOD IsDone();
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NS_IMETHOD PositionAt(nsIContent* aCurNode);
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NS_IMETHOD MakePre();
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NS_IMETHOD MakePost();
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private:
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nsCOMPtr<nsIPresContext> mPresContext;
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nsIFrame* mParentFrame;
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nsIFrame* mCurrentChild;
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PRBool mIsDone;
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};
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GeneratedContentIterator::GeneratedContentIterator(nsIPresContext* aPresContext,
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nsIFrame* aFrame)
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: mPresContext(aPresContext), mParentFrame(aFrame), mIsDone(PR_FALSE)
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{
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NS_INIT_REFCNT();
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First();
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}
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NS_IMPL_ISUPPORTS(GeneratedContentIterator, NS_GET_IID(nsIContentIterator));
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GeneratedContentIterator::~GeneratedContentIterator()
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{
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}
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NS_IMETHODIMP
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GeneratedContentIterator::Init(nsIContent* aRoot)
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{
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return NS_ERROR_ALREADY_INITIALIZED;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::Init(nsIDOMRange* aRange)
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{
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return NS_ERROR_ALREADY_INITIALIZED;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::First()
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{
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// Get the first child frame and make it the current node
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mParentFrame->FirstChild(mPresContext, nsnull, &mCurrentChild);
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if (!mCurrentChild) {
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return NS_ERROR_FAILURE;
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}
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mIsDone = PR_FALSE;
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return NS_OK;
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}
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static nsIFrame*
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GetNextChildFrame(nsIPresContext* aPresContext, nsIFrame* aFrame)
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{
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NS_PRECONDITION(aFrame, "null pointer");
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// Get the last-in-flow
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while (PR_TRUE) {
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nsIFrame* nextInFlow;
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aFrame->GetNextInFlow(&nextInFlow);
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if (nextInFlow) {
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aFrame = nextInFlow;
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} else {
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break;
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}
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}
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// Get its next sibling
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nsIFrame* nextSibling;
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aFrame->GetNextSibling(&nextSibling);
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// If there's no next sibling, then check if the parent frame
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// has a next-in-flow and look there
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if (!nextSibling) {
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nsIFrame* parent;
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aFrame->GetParent(&parent);
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parent->GetNextInFlow(&parent);
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if (parent) {
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parent->FirstChild(aPresContext, nsnull, &nextSibling);
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}
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}
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return nextSibling;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::Last()
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{
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nsIFrame* nextChild;
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// Starting with the first child walk and find the last child
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mCurrentChild = nsnull;
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mParentFrame->FirstChild(mPresContext, nsnull, &nextChild);
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while (nextChild) {
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mCurrentChild = nextChild;
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nextChild = ::GetNextChildFrame(mPresContext, nextChild);
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}
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if (!mCurrentChild) {
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return NS_ERROR_FAILURE;
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}
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mIsDone = PR_FALSE;
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return NS_OK;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::Next()
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{
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nsIFrame* nextChild = ::GetNextChildFrame(mPresContext, mCurrentChild);
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if (nextChild) {
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// Advance to the next child
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mCurrentChild = nextChild;
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// If we're at the end then the collection is at the end
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mIsDone = (nsnull == ::GetNextChildFrame(mPresContext, mCurrentChild));
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return NS_OK;
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}
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return NS_ERROR_FAILURE;
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}
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static nsIFrame*
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GetPrevChildFrame(nsIPresContext* aPresContext, nsIFrame* aFrame)
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{
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NS_PRECONDITION(aFrame, "null pointer");
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// Get its previous sibling. Because we have a singly linked list we
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// need to search from the first child
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nsIFrame* parent;
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nsIFrame* firstChild;
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nsIFrame* prevSibling;
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aFrame->GetParent(&parent);
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parent->FirstChild(aPresContext, nsnull, &firstChild);
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NS_ASSERTION(firstChild, "parent has no first child");
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nsFrameList frameList(firstChild);
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prevSibling = frameList.GetPrevSiblingFor(aFrame);
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// If there's no previous sibling, then check if the parent frame
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// has a prev-in-flow and look there
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if (!prevSibling) {
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parent->GetPrevInFlow(&parent);
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if (parent) {
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parent->FirstChild(aPresContext, nsnull, &firstChild);
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frameList.SetFrames(firstChild);
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prevSibling = frameList.LastChild();
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}
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}
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// Get the first-in-flow
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while (PR_TRUE) {
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nsIFrame* prevInFlow;
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prevSibling->GetPrevInFlow(&prevInFlow);
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if (prevInFlow) {
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prevSibling = prevInFlow;
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} else {
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break;
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}
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}
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return prevSibling;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::Prev()
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{
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nsIFrame* prevChild = ::GetPrevChildFrame(mPresContext, mCurrentChild);
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if (prevChild) {
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// Make the previous child the current child
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mCurrentChild = prevChild;
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// If we're at the beginning then the collection is at the end
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mIsDone = (nsnull == ::GetPrevChildFrame(mPresContext, mCurrentChild));
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return NS_OK;
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}
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::CurrentNode(nsIContent **aNode)
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{
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if (mCurrentChild) {
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mCurrentChild->GetContent(aNode);
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return NS_OK;
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} else {
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*aNode = nsnull;
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return NS_ERROR_FAILURE;
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}
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}
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NS_IMETHODIMP
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GeneratedContentIterator::IsDone()
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{
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return mIsDone ? NS_OK : NS_ENUMERATOR_FALSE;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::PositionAt(nsIContent* aCurNode)
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{
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nsIFrame* child;
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// Starting with the first child frame search for the child frame
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// with the matching content object
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mParentFrame->FirstChild(mPresContext, nsnull, &child);
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while (child) {
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nsCOMPtr<nsIContent> content;
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child->GetContent(getter_AddRefs(content));
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if (content.get() == aCurNode) {
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break;
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}
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child = ::GetNextChildFrame(mPresContext, child);
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}
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if (child) {
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// Make it the current child
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mCurrentChild = child;
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mIsDone = PR_FALSE;
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return NS_OK;
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}
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::MakePre()
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::MakePost()
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{
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return NS_ERROR_NOT_IMPLEMENTED;
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}
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nsresult
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NS_NewGeneratedContentIterator(nsIPresContext* aPresContext,
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nsIFrame* aFrame,
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nsIContentIterator** aIterator)
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{
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*aIterator = nsnull;
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return NS_ERROR_NOT_IMPLEMENTED;
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NS_ENSURE_ARG_POINTER(aIterator);
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if (!aIterator) {
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return NS_ERROR_NULL_POINTER;
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}
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// Make sure the frame corresponds to generated content
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#ifdef DEBUG
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nsFrameState frameState;
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aFrame->GetFrameState(&frameState);
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NS_ASSERTION(frameState & NS_FRAME_GENERATED_CONTENT, "unexpected frame");
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#endif
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GeneratedContentIterator* it = new GeneratedContentIterator(aPresContext, aFrame);
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if (!it) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return it->QueryInterface(NS_GET_IID(nsIContentIterator), (void **)aIterator);
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}
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nsresult
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@ -652,13 +652,290 @@ GetChildListNameFor(nsIPresContext* aPresContext,
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*aListName = listName;
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}
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class GeneratedContentIterator : public nsIContentIterator
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{
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public:
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GeneratedContentIterator(nsIPresContext* aPresContext, nsIFrame* aFrame);
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virtual ~GeneratedContentIterator();
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// nsISupports
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NS_DECL_ISUPPORTS
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// nsIContentIterator
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NS_IMETHOD Init(nsIContent* aRoot);
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NS_IMETHOD Init(nsIDOMRange* aRange);
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NS_IMETHOD First();
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NS_IMETHOD Last();
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NS_IMETHOD Next();
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NS_IMETHOD Prev();
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NS_IMETHOD CurrentNode(nsIContent **aNode);
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NS_IMETHOD IsDone();
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NS_IMETHOD PositionAt(nsIContent* aCurNode);
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NS_IMETHOD MakePre();
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NS_IMETHOD MakePost();
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private:
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nsCOMPtr<nsIPresContext> mPresContext;
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nsIFrame* mParentFrame;
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nsIFrame* mCurrentChild;
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PRBool mIsDone;
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};
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GeneratedContentIterator::GeneratedContentIterator(nsIPresContext* aPresContext,
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nsIFrame* aFrame)
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: mPresContext(aPresContext), mParentFrame(aFrame), mIsDone(PR_FALSE)
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{
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NS_INIT_REFCNT();
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First();
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}
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NS_IMPL_ISUPPORTS(GeneratedContentIterator, NS_GET_IID(nsIContentIterator));
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GeneratedContentIterator::~GeneratedContentIterator()
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{
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}
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NS_IMETHODIMP
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GeneratedContentIterator::Init(nsIContent* aRoot)
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{
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return NS_ERROR_ALREADY_INITIALIZED;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::Init(nsIDOMRange* aRange)
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{
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return NS_ERROR_ALREADY_INITIALIZED;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::First()
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{
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// Get the first child frame and make it the current node
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mParentFrame->FirstChild(mPresContext, nsnull, &mCurrentChild);
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if (!mCurrentChild) {
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return NS_ERROR_FAILURE;
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}
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mIsDone = PR_FALSE;
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return NS_OK;
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}
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static nsIFrame*
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GetNextChildFrame(nsIPresContext* aPresContext, nsIFrame* aFrame)
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{
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NS_PRECONDITION(aFrame, "null pointer");
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// Get the last-in-flow
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while (PR_TRUE) {
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nsIFrame* nextInFlow;
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aFrame->GetNextInFlow(&nextInFlow);
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if (nextInFlow) {
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aFrame = nextInFlow;
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} else {
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break;
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}
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}
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// Get its next sibling
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nsIFrame* nextSibling;
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aFrame->GetNextSibling(&nextSibling);
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// If there's no next sibling, then check if the parent frame
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// has a next-in-flow and look there
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if (!nextSibling) {
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nsIFrame* parent;
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aFrame->GetParent(&parent);
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parent->GetNextInFlow(&parent);
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if (parent) {
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parent->FirstChild(aPresContext, nsnull, &nextSibling);
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}
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}
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return nextSibling;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::Last()
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{
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nsIFrame* nextChild;
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// Starting with the first child walk and find the last child
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mCurrentChild = nsnull;
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mParentFrame->FirstChild(mPresContext, nsnull, &nextChild);
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while (nextChild) {
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mCurrentChild = nextChild;
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nextChild = ::GetNextChildFrame(mPresContext, nextChild);
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}
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if (!mCurrentChild) {
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return NS_ERROR_FAILURE;
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}
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mIsDone = PR_FALSE;
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return NS_OK;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::Next()
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{
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nsIFrame* nextChild = ::GetNextChildFrame(mPresContext, mCurrentChild);
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if (nextChild) {
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// Advance to the next child
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mCurrentChild = nextChild;
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// If we're at the end then the collection is at the end
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mIsDone = (nsnull == ::GetNextChildFrame(mPresContext, mCurrentChild));
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return NS_OK;
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}
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return NS_ERROR_FAILURE;
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}
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static nsIFrame*
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GetPrevChildFrame(nsIPresContext* aPresContext, nsIFrame* aFrame)
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{
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NS_PRECONDITION(aFrame, "null pointer");
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// Get its previous sibling. Because we have a singly linked list we
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// need to search from the first child
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nsIFrame* parent;
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nsIFrame* firstChild;
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nsIFrame* prevSibling;
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aFrame->GetParent(&parent);
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parent->FirstChild(aPresContext, nsnull, &firstChild);
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NS_ASSERTION(firstChild, "parent has no first child");
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nsFrameList frameList(firstChild);
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prevSibling = frameList.GetPrevSiblingFor(aFrame);
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// If there's no previous sibling, then check if the parent frame
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// has a prev-in-flow and look there
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if (!prevSibling) {
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parent->GetPrevInFlow(&parent);
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if (parent) {
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parent->FirstChild(aPresContext, nsnull, &firstChild);
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frameList.SetFrames(firstChild);
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prevSibling = frameList.LastChild();
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}
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}
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// Get the first-in-flow
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while (PR_TRUE) {
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nsIFrame* prevInFlow;
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prevSibling->GetPrevInFlow(&prevInFlow);
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if (prevInFlow) {
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prevSibling = prevInFlow;
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} else {
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break;
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}
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}
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return prevSibling;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::Prev()
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{
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nsIFrame* prevChild = ::GetPrevChildFrame(mPresContext, mCurrentChild);
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if (prevChild) {
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// Make the previous child the current child
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mCurrentChild = prevChild;
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// If we're at the beginning then the collection is at the end
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mIsDone = (nsnull == ::GetPrevChildFrame(mPresContext, mCurrentChild));
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return NS_OK;
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}
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return NS_ERROR_FAILURE;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::CurrentNode(nsIContent **aNode)
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{
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if (mCurrentChild) {
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mCurrentChild->GetContent(aNode);
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return NS_OK;
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} else {
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*aNode = nsnull;
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return NS_ERROR_FAILURE;
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}
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}
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NS_IMETHODIMP
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GeneratedContentIterator::IsDone()
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{
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return mIsDone ? NS_OK : NS_ENUMERATOR_FALSE;
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}
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NS_IMETHODIMP
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GeneratedContentIterator::PositionAt(nsIContent* aCurNode)
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{
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nsIFrame* child;
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// Starting with the first child frame search for the child frame
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// with the matching content object
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mParentFrame->FirstChild(mPresContext, nsnull, &child);
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while (child) {
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nsCOMPtr<nsIContent> content;
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child->GetContent(getter_AddRefs(content));
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if (content.get() == aCurNode) {
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break;
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}
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child = ::GetNextChildFrame(mPresContext, child);
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}
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||||
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||||
if (child) {
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// Make it the current child
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mCurrentChild = child;
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mIsDone = PR_FALSE;
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return NS_OK;
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}
|
||||
|
||||
return NS_ERROR_FAILURE;
|
||||
}
|
||||
|
||||
NS_IMETHODIMP
|
||||
GeneratedContentIterator::MakePre()
|
||||
{
|
||||
return NS_ERROR_NOT_IMPLEMENTED;
|
||||
}
|
||||
|
||||
NS_IMETHODIMP
|
||||
GeneratedContentIterator::MakePost()
|
||||
{
|
||||
return NS_ERROR_NOT_IMPLEMENTED;
|
||||
}
|
||||
|
||||
nsresult
|
||||
NS_NewGeneratedContentIterator(nsIPresContext* aPresContext,
|
||||
nsIFrame* aFrame,
|
||||
nsIContentIterator** aIterator)
|
||||
{
|
||||
*aIterator = nsnull;
|
||||
return NS_ERROR_NOT_IMPLEMENTED;
|
||||
NS_ENSURE_ARG_POINTER(aIterator);
|
||||
if (!aIterator) {
|
||||
return NS_ERROR_NULL_POINTER;
|
||||
}
|
||||
|
||||
// Make sure the frame corresponds to generated content
|
||||
#ifdef DEBUG
|
||||
nsFrameState frameState;
|
||||
aFrame->GetFrameState(&frameState);
|
||||
NS_ASSERTION(frameState & NS_FRAME_GENERATED_CONTENT, "unexpected frame");
|
||||
#endif
|
||||
|
||||
GeneratedContentIterator* it = new GeneratedContentIterator(aPresContext, aFrame);
|
||||
if (!it) {
|
||||
return NS_ERROR_OUT_OF_MEMORY;
|
||||
}
|
||||
return it->QueryInterface(NS_GET_IID(nsIContentIterator), (void **)aIterator);
|
||||
}
|
||||
|
||||
nsresult
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче