nsresult
nsAttrAndChildArray::InsertChildAt(nsIContent* aChild, PRUint32 aPos)
{
NS_ASSERTION(aChild, "nullchild");
NS_ASSERTION(aPos <= ChildCount(), "out-of-bounds");
PRUint32 offset = AttrSlotsSize();
PRUint32 childCount = ChildCount();
NS_ENSURE_TRUE(childCount < ATTRCHILD_ARRAY_MAX_CHILD_COUNT,
NS_ERROR_FAILURE);
// First try to fit new child in existing childlist
if (mImpl && offset + childCount < mImpl->mBufferSize) {
void** pos = mImpl->mBuffer + offset + aPos;
if (childCount != aPos) {
memmove(pos + 1, pos, (childCount - aPos) * sizeof(nsIContent*));
}
SetChildAtPos(pos, aChild, aPos, childCount);
SetChildCount(childCount + 1);
return NS_OK;
}
// Try to fit new child in existing buffer by compressing attrslots
if (offset && !mImpl->mBuffer[offset - ATTRSIZE]) {
// Compress away all empty slots while we're at it. This might not be the
// optimal thing to do.
PRUint32 attrCount = NonMappedAttrCount();
void** newStart = mImpl->mBuffer + attrCount * ATTRSIZE;
void** oldStart = mImpl->mBuffer + offset;
memmove(newStart, oldStart, aPos * sizeof(nsIContent*));
memmove(&newStart[aPos + 1], &oldStart[aPos],
(childCount - aPos) * sizeof(nsIContent*));
SetChildAtPos(newStart + aPos, aChild, aPos, childCount);
SetAttrSlotAndChildCount(attrCount, childCount + 1);
return NS_OK;
}
// We can't fit in current buffer, Realloc time!
if (!GrowBy(1)) {
return NS_ERROR_OUT_OF_MEMORY;
}
void** pos = mImpl->mBuffer + offset + aPos;
if (childCount != aPos) {
memmove(pos + 1, pos, (childCount - aPos) * sizeof(nsIContent*));
}
SetChildAtPos(pos, aChild, aPos, childCount);
SetChildCount(childCount + 1);
return NS_OK;
}
nsLineBox::nsLineBox(nsIFrame* aFrame, PRInt32 aCount, PRBool aIsBlock)
: mFirstChild(aFrame),
mBounds(0, 0, 0, 0),
mAscent(0),
mData(nsnull)
{
MOZ_COUNT_CTOR(nsLineBox);
#ifdef DEBUG
++ctorCount;
NS_ASSERTION(!aIsBlock || aCount == 1, "Blocks must have exactly one child");
nsIFrame* f = aFrame;
for (PRInt32 n = aCount; n > 0; f = f->GetNextSibling(), --n) {
NS_ASSERTION(aIsBlock == f->GetStyleDisplay()->IsBlockOutside(),
"wrong kind of child frame");
}
#endif
mAllFlags = 0;
#if NS_STYLE_CLEAR_NONE > 0
mFlags.mBreakType = NS_STYLE_CLEAR_NONE;
#endif
SetChildCount(aCount);
MarkDirty();
mFlags.mBlock = aIsBlock;
}
void
nsAttrAndChildArray::RemoveChildAt(PRUint32 aPos)
{
NS_ASSERTION(aPos < ChildCount(), "out-of-bounds");
PRUint32 childCount = ChildCount();
void** pos = mImpl->mBuffer + AttrSlotsSize() + aPos;
nsIContent* child = static_cast<nsIContent*>(*pos);
if (child->mPreviousSibling) {
child->mPreviousSibling->mNextSibling = child->mNextSibling;
}
if (child->mNextSibling) {
child->mNextSibling->mPreviousSibling = child->mPreviousSibling;
}
child->mPreviousSibling = child->mNextSibling = nsnull;
NS_RELEASE(child);
memmove(pos, pos + 1, (childCount - aPos - 1) * sizeof(nsIContent*));
SetChildCount(childCount - 1);
}
already_AddRefed<nsIContent>
nsAttrAndChildArray::TakeChildAt(uint32_t aPos)
{
NS_ASSERTION(aPos < ChildCount(), "out-of-bounds");
uint32_t childCount = ChildCount();
void** pos = mImpl->mBuffer + AttrSlotsSize() + aPos;
nsIContent* child = static_cast<nsIContent*>(*pos);
if (child->mPreviousSibling) {
child->mPreviousSibling->mNextSibling = child->mNextSibling;
}
if (child->mNextSibling) {
child->mNextSibling->mPreviousSibling = child->mPreviousSibling;
}
child->mPreviousSibling = child->mNextSibling = nullptr;
memmove(pos, pos + 1, (childCount - aPos - 1) * sizeof(nsIContent*));
SetChildCount(childCount - 1);
return dont_AddRef(child);
}
