void TEST_availSpace(void){
CU_ASSERT(availSpace(heap_kb) == (1000/2) - (sizeof(void*)*3));
CU_ASSERT(availSpace(heap_mb) == (1000000/2) - (sizeof(void*)*3));
}
bool
nsBlockReflowContext::ComputeCollapsedTopMargin(const nsHTMLReflowState& aRS,
nsCollapsingMargin* aMargin, nsIFrame* aClearanceFrame,
bool* aMayNeedRetry, bool* aBlockIsEmpty)
{
// Include frame's top margin
aMargin->Include(aRS.mComputedMargin.top);
// The inclusion of the bottom margin when empty is done by the caller
// since it doesn't need to be done by the top-level (non-recursive)
// caller.
#ifdef NOISY_VERTICAL_MARGINS
nsFrame::ListTag(stdout, aRS.frame);
printf(": %d => %d\n", aRS.mComputedMargin.top, aMargin->get());
#endif
bool dirtiedLine = false;
bool setBlockIsEmpty = false;
// Calculate the frame's generational top-margin from its child
// blocks. Note that if the frame has a non-zero top-border or
// top-padding then this step is skipped because it will be a margin
// root. It is also skipped if the frame is a margin root for other
// reasons.
nsIFrame* frame = DescendIntoBlockLevelFrame(aRS.frame);
nsPresContext* prescontext = frame->PresContext();
nsBlockFrame* block = nsnull;
if (0 == aRS.mComputedBorderPadding.top) {
block = nsLayoutUtils::GetAsBlock(frame);
if (block) {
bool topMarginRoot, unused;
block->IsMarginRoot(&topMarginRoot, &unused);
if (topMarginRoot) {
block = nsnull;
}
}
}
// iterate not just through the lines of 'block' but also its
// overflow lines and the normal and overflow lines of its next in
// flows. Note that this will traverse some frames more than once:
// for example, if A contains B and A->nextinflow contains
// B->nextinflow, we'll traverse B->nextinflow twice. But this is
// OK because our traversal is idempotent.
for ( ;block; block = static_cast<nsBlockFrame*>(block->GetNextInFlow())) {
for (PRIntn overflowLines = false; overflowLines <= true; ++overflowLines) {
nsBlockFrame::line_iterator line;
nsBlockFrame::line_iterator line_end;
bool anyLines = true;
if (overflowLines) {
nsBlockFrame::FrameLines* frames = block->GetOverflowLines();
nsLineList* lines = frames ? &frames->mLines : nsnull;
if (!lines) {
anyLines = false;
} else {
line = lines->begin();
line_end = lines->end();
}
} else {
line = block->begin_lines();
line_end = block->end_lines();
}
for (; anyLines && line != line_end; ++line) {
if (!aClearanceFrame && line->HasClearance()) {
// If we don't have a clearance frame, then we're computing
// the collapsed margin in the first pass, assuming that all
// lines have no clearance. So clear their clearance flags.
line->ClearHasClearance();
line->MarkDirty();
dirtiedLine = true;
}
bool isEmpty;
if (line->IsInline()) {
isEmpty = line->IsEmpty();
} else {
nsIFrame* kid = line->mFirstChild;
if (kid == aClearanceFrame) {
line->SetHasClearance();
line->MarkDirty();
dirtiedLine = true;
goto done;
}
// Here is where we recur. Now that we have determined that a
// generational collapse is required we need to compute the
// child blocks margin and so in so that we can look into
// it. For its margins to be computed we need to have a reflow
// state for it.
// We may have to construct an extra reflow state here if
// we drilled down through a block wrapper. At the moment
// we can only drill down one level so we only have to support
// one extra reflow state.
const nsHTMLReflowState* outerReflowState = &aRS;
if (frame != aRS.frame) {
NS_ASSERTION(frame->GetParent() == aRS.frame,
"Can only drill through one level of block wrapper");
nsSize availSpace(aRS.ComputedWidth(), aRS.ComputedHeight());
outerReflowState = new nsHTMLReflowState(prescontext,
aRS, frame, availSpace);
}
{
nsSize availSpace(outerReflowState->ComputedWidth(),
outerReflowState->ComputedHeight());
nsHTMLReflowState innerReflowState(prescontext,
*outerReflowState, kid,
availSpace);
// Record that we're being optimistic by assuming the kid
// has no clearance
if (kid->GetStyleDisplay()->mBreakType != NS_STYLE_CLEAR_NONE) {
*aMayNeedRetry = true;
}
if (ComputeCollapsedTopMargin(innerReflowState, aMargin, aClearanceFrame, aMayNeedRetry, &isEmpty)) {
line->MarkDirty();
dirtiedLine = true;
}
if (isEmpty)
aMargin->Include(innerReflowState.mComputedMargin.bottom);
}
if (outerReflowState != &aRS) {
delete const_cast<nsHTMLReflowState*>(outerReflowState);
}
}
if (!isEmpty) {
if (!setBlockIsEmpty && aBlockIsEmpty) {
setBlockIsEmpty = true;
*aBlockIsEmpty = false;
}
goto done;
}
}
if (!setBlockIsEmpty && aBlockIsEmpty) {
// The first time we reach here is when this is the first block
// and we have processed all its normal lines.
setBlockIsEmpty = true;
// All lines are empty, or we wouldn't be here!
*aBlockIsEmpty = aRS.frame->IsSelfEmpty();
}
}
}
done:
if (!setBlockIsEmpty && aBlockIsEmpty) {
*aBlockIsEmpty = aRS.frame->IsEmpty();
}
#ifdef NOISY_VERTICAL_MARGINS
nsFrame::ListTag(stdout, aRS.frame);
printf(": => %d\n", aMargin->get());
#endif
return dirtiedLine;
}
// XXXldb This behavior doesn't quite fit with CSS1 and CSS2 --
// technically we're supposed let the current line flow around the
// float as well unless it won't fit next to what we already have.
// But nobody else implements it that way...
PRBool
nsBlockReflowState::AddFloat(nsLineLayout* aLineLayout,
nsIFrame* aFloat,
nscoord aAvailableWidth,
nsReflowStatus& aReflowStatus)
{
NS_PRECONDITION(!aLineLayout || mBlock->end_lines() != mCurrentLine, "null ptr");
NS_PRECONDITION(aFloat->GetStateBits() & NS_FRAME_OUT_OF_FLOW,
"aFloat must be an out-of-flow frame");
// Set the geometric parent of the float
aFloat->SetParent(mBlock);
aReflowStatus = NS_FRAME_COMPLETE;
// Because we are in the middle of reflowing a placeholder frame
// within a line (and possibly nested in an inline frame or two
// that's a child of our block) we need to restore the space
// manager's translation to the space that the block resides in
// before placing the float.
nscoord ox, oy;
mFloatManager->GetTranslation(ox, oy);
nscoord dx = ox - mFloatManagerX;
nscoord dy = oy - mFloatManagerY;
mFloatManager->Translate(-dx, -dy);
PRBool placed;
// Now place the float immediately if possible. Otherwise stash it
// away in mPendingFloats and place it later.
// If one or more floats has already been pushed to the next line,
// don't let this one go on the current line, since that would violate
// float ordering.
nsRect floatAvailableSpace = GetFloatAvailableSpace().mRect;
if (!aLineLayout ||
(mBelowCurrentLineFloats.IsEmpty() &&
(aLineLayout->LineIsEmpty() ||
mBlock->ComputeFloatWidth(*this, floatAvailableSpace, aFloat)
<= aAvailableWidth))) {
// And then place it
// force it to fit if we're at the top of the block and we can't
// break before this
PRBool forceFit = !aLineLayout ||
(IsAdjacentWithTop() && !aLineLayout->LineIsBreakable());
placed = FlowAndPlaceFloat(aFloat, aReflowStatus, forceFit);
NS_ASSERTION(placed || !forceFit,
"If we asked for force-fit, it should have been placed");
if (forceFit || (placed && !NS_FRAME_IS_TRUNCATED(aReflowStatus))) {
// Pass on updated available space to the current inline reflow engine
nsFlowAreaRect floatAvailSpace =
GetFloatAvailableSpace(mY, forceFit);
nsRect availSpace(nsPoint(floatAvailSpace.mRect.x + BorderPadding().left,
mY),
floatAvailSpace.mRect.Size());
if (aLineLayout) {
aLineLayout->UpdateBand(availSpace, aFloat);
// Record this float in the current-line list
mCurrentLineFloats.Append(mFloatCacheFreeList.Alloc(aFloat));
}
// If we can't break here, hide the fact that it's truncated
// XXX We can probably do this more cleanly
aReflowStatus &= ~NS_FRAME_TRUNCATED;
}
else {
if (IsAdjacentWithTop()) {
// Pushing the line to the next page won't give us any more space;
// therefore, we break.
NS_ASSERTION(aLineLayout->LineIsBreakable(),
"We can't get here unless forceFit is false");
aReflowStatus = NS_INLINE_LINE_BREAK_BEFORE();
} else {
// Make sure we propagate the truncated status; this signals the
// block to push the line to the next page.
aReflowStatus |= NS_FRAME_TRUNCATED;
}
}
}
else {
// Always claim to be placed; we don't know whether we fit yet, so we
// deal with this in PlaceBelowCurrentLineFloats
placed = PR_TRUE;
// This float will be placed after the line is done (it is a
// below-current-line float).
mBelowCurrentLineFloats.Append(mFloatCacheFreeList.Alloc(aFloat));
}
// Restore coordinate system
mFloatManager->Translate(dx, dy);
return placed;
}
