C++ CounterNode::recount方法代码示例

void CounterReset::removeChild ( CounterNode *oldChild )
{
    Q_ASSERT( oldChild );

    CounterNode* next = oldChild->m_next;
    CounterNode* prev = oldChild->m_previous;

    if (oldChild->firstChild()) {
        CounterNode* first = oldChild->firstChild();
        CounterNode* last = oldChild->lastChild();
        if (prev) {
            prev->m_next = first;
            first->m_previous = prev;
        }
        else {
            assert ( m_first == oldChild );
            m_first = first;
         }

        if (next) {
            next->m_previous = last;
            last->m_next = next;
        }
        else {
            assert ( m_last == oldChild );
            m_last = last;
        }

        next = first;
        while (next) {
            next->m_parent = this;
            if (next == last) break;
            next = next->m_next;
        }

        first->recount(true);
    }
    else {
        if (prev) prev->m_next = next;
        else {
            assert ( m_first == oldChild );
            m_first = next;
        }
        if (next) next->m_previous = prev;
        else {
            assert ( m_last == oldChild );
            m_last = prev;
        }
        if (next)
            next->recount();
    }


    oldChild->m_next = 0;
    oldChild->m_previous = 0;
    oldChild->m_parent = 0;
}

void CounterNode::insertAfter(CounterNode* newChild, CounterNode* refChild)
{
    ASSERT(newChild);
    ASSERT(!newChild->m_parent);
    ASSERT(!newChild->m_previousSibling);
    ASSERT(!newChild->m_nextSibling);
    ASSERT(!refChild || refChild->m_parent == this);

    CounterNode* next;

    if (refChild) {
        next = refChild->m_nextSibling;
        refChild->m_nextSibling = newChild;
    } else {
        next = m_firstChild;
        m_firstChild = newChild;
    }

    if (next) {
        ASSERT(next->m_previousSibling == refChild);
        next->m_previousSibling = newChild;
    } else {
        ASSERT(m_lastChild == refChild);
        m_lastChild = newChild;
    }

    newChild->m_parent = this;
    newChild->m_previousSibling = refChild;
    newChild->m_nextSibling = next;

    newChild->m_countInParent = newChild->computeCountInParent();
    if (next)
        next->recount();
}

void CounterNode::removeChild(CounterNode* oldChild)
{
    ASSERT(oldChild);
    ASSERT(!oldChild->m_firstChild);
    ASSERT(!oldChild->m_lastChild);

    CounterNode* next = oldChild->m_nextSibling;
    CounterNode* prev = oldChild->m_previousSibling;

    oldChild->m_nextSibling = 0;
    oldChild->m_previousSibling = 0;
    oldChild->m_parent = 0;

    if (prev) 
        prev->m_nextSibling = next;
    else {
        ASSERT(m_firstChild == oldChild);
        m_firstChild = next;
    }
    
    if (next)
        next->m_previousSibling = prev;
    else {
        ASSERT(m_lastChild == oldChild);
        m_lastChild = prev;
    }
    
    if (next)
        next->recount();
}

void CounterNode::removeChild(CounterNode* oldChild, const AtomicString& identifier)
{
    ASSERT(oldChild);
    ASSERT(!oldChild->m_firstChild);
    ASSERT(!oldChild->m_lastChild);

    CounterNode* next = oldChild->m_nextSibling;
    CounterNode* previous = oldChild->m_previousSibling;

    oldChild->m_nextSibling = 0;
    oldChild->m_previousSibling = 0;
    oldChild->m_parent = 0;

    if (previous) 
        previous->m_nextSibling = next;
    else {
        ASSERT(m_firstChild == oldChild);
        m_firstChild = next;
    }

    if (next)
        next->m_previousSibling = previous;
    else {
        ASSERT(m_lastChild == oldChild);
        m_lastChild = previous;
    }

    if (next)
        next->recount(identifier);
}

void CounterNode::insertAfter(CounterNode* newChild, CounterNode* refChild, const AtomicString& identifier)
{
    ASSERT(newChild);
    ASSERT(!newChild->m_parent);
    ASSERT(!newChild->m_previousSibling);
    ASSERT(!newChild->m_nextSibling);
    // If the refChild is not our child we can not complete the request. This hardens against bugs in RenderCounter.
    // When renderers are reparented it may request that we insert counter nodes improperly.
    if (refChild && refChild->m_parent != this)
        return;

    if (newChild->m_hasResetType) {
        while (m_lastChild != refChild)
            RenderCounter::destroyCounterNode(m_lastChild->owner(), identifier);
    }

    CounterNode* next;

    if (refChild) {
        next = refChild->m_nextSibling;
        refChild->m_nextSibling = newChild;
    } else {
        next = m_firstChild;
        m_firstChild = newChild;
    }

    newChild->m_parent = this;
    newChild->m_previousSibling = refChild;

    if (next) {
        ASSERT(next->m_previousSibling == refChild);
        next->m_previousSibling = newChild;
        newChild->m_nextSibling = next;
    } else {
        ASSERT(m_lastChild == refChild);
        m_lastChild = newChild;
    }

    if (!newChild->m_firstChild || newChild->m_hasResetType) {
        newChild->m_countInParent = newChild->computeCountInParent();
        newChild->resetThisAndDescendantsRenderers();
        if (next)
            next->recount();
        return;
    }

    // The code below handles the case when a formerly root increment counter is loosing its root position
    // and therefore its children become next siblings.
    CounterNode* last = newChild->m_lastChild;
    CounterNode* first = newChild->m_firstChild;

    if (first) {
        ASSERT(last);
        newChild->m_nextSibling = first;
        if (m_lastChild == newChild)
            m_lastChild = last;

        first->m_previousSibling = newChild;

        // The case when the original next sibling of the inserted node becomes a child of
        // one of the former children of the inserted node is not handled as it is believed
        // to be impossible since:
        // 1. if the increment counter node lost it's root position as a result of another
        //    counter node being created, it will be inserted as the last child so next is null.
        // 2. if the increment counter node lost it's root position as a result of a renderer being
        //    inserted into the document's render tree, all its former children counters are attached
        //    to children of the inserted renderer and hence cannot be in scope for counter nodes
        //    attached to renderers that were already in the document's render tree.
        last->m_nextSibling = next;
        if (next) {
            ASSERT(next->m_previousSibling == newChild);
            next->m_previousSibling = last;
        } else
            m_lastChild = last;
        for (next = first; ; next = next->m_nextSibling) {
            next->m_parent = this;
            if (last == next)
                break;
        }
    }
    newChild->m_firstChild = 0;
    newChild->m_lastChild = 0;
    newChild->m_countInParent = newChild->computeCountInParent();
    newChild->resetRenderers();
    first->recount();
}