/*
* Reconstruct the vertical margin before the line |aLine| in order to
* do an incremental reflow that begins with |aLine| without reflowing
* the line before it. |aLine| may point to the fencepost at the end of
* the line list, and it is used this way since we (for now, anyway)
* always need to recover margins at the end of a block.
*
* The reconstruction involves walking backward through the line list to
* find any collapsed margins preceding the line that would have been in
* the reflow state's |mPrevBEndMargin| when we reflowed that line in
* a full reflow (under the rule in CSS2 that all adjacent vertical
* margins of blocks collapse).
*/
void
nsBlockReflowState::ReconstructMarginBefore(nsLineList::iterator aLine)
{
mPrevBEndMargin.Zero();
nsBlockFrame *block = mBlock;
nsLineList::iterator firstLine = block->begin_lines();
for (;;) {
--aLine;
if (aLine->IsBlock()) {
mPrevBEndMargin = aLine->GetCarriedOutBEndMargin();
break;
}
if (!aLine->IsEmpty()) {
break;
}
if (aLine == firstLine) {
// If the top margin was carried out (and thus already applied),
// set it to zero. Either way, we're done.
if (!GetFlag(BRS_ISBSTARTMARGINROOT)) {
mPrevBEndMargin.Zero();
}
break;
}
}
}
/*
* Reconstruct the vertical margin before the line |aLine| in order to
* do an incremental reflow that begins with |aLine| without reflowing
* the line before it. |aLine| may point to the fencepost at the end of
* the line list, and it is used this way since we (for now, anyway)
* always need to recover margins at the end of a block.
*
* The reconstruction involves walking backward through the line list to
* find any collapsed margins preceding the line that would have been in
* the reflow state's |mPrevBEndMargin| when we reflowed that line in
* a full reflow (under the rule in CSS2 that all adjacent vertical
* margins of blocks collapse).
*/
void
BlockReflowInput::ReconstructMarginBefore(nsLineList::iterator aLine)
{
mPrevBEndMargin.Zero();
nsBlockFrame *block = mBlock;
nsLineList::iterator firstLine = block->LinesBegin();
for (;;) {
--aLine;
if (aLine->IsBlock()) {
mPrevBEndMargin = aLine->GetCarriedOutBEndMargin();
break;
}
if (!aLine->IsEmpty()) {
break;
}
if (aLine == firstLine) {
// If the top margin was carried out (and thus already applied),
// set it to zero. Either way, we're done.
if (!mFlags.mIsBStartMarginRoot) {
mPrevBEndMargin.Zero();
}
break;
}
}
}
