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gecko/layout/generic/nsBlockFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
// vim:cindent:ts=2:et:sw=2:
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Steve Clark <buster@netscape.com>
* Robert O'Callahan <roc+moz@cs.cmu.edu>
* L. David Baron <dbaron@dbaron.org>
* IBM Corporation
* Mats Palmgren <matspal@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* rendering object for CSS display:block, inline-block, and list-item
* boxes, also used for various anonymous boxes
*/
#include "nsCOMPtr.h"
#include "nsBlockFrame.h"
#include "nsBlockReflowContext.h"
#include "nsBlockReflowState.h"
#include "nsBulletFrame.h"
#include "nsLineBox.h"
#include "nsInlineFrame.h"
#include "nsLineLayout.h"
#include "nsPlaceholderFrame.h"
#include "nsStyleConsts.h"
#include "nsFrameManager.h"
#include "nsPresContext.h"
#include "nsIPresShell.h"
#include "nsStyleContext.h"
#include "nsIView.h"
#include "nsIFontMetrics.h"
#include "nsHTMLParts.h"
#include "nsGkAtoms.h"
#include "nsIDOMEvent.h"
#include "nsGenericHTMLElement.h"
#include "prprf.h"
#include "nsStyleChangeList.h"
#include "nsFrameSelection.h"
#include "nsFloatManager.h"
#include "nsIntervalSet.h"
#include "prenv.h"
#include "plstr.h"
#include "nsGUIEvent.h"
#include "nsLayoutErrors.h"
#include "nsAutoPtr.h"
#include "nsIServiceManager.h"
#include "nsIScrollableFrame.h"
#ifdef ACCESSIBILITY
#include "nsIDOMHTMLDocument.h"
#include "nsIAccessibilityService.h"
#endif
#include "nsLayoutUtils.h"
#include "nsDisplayList.h"
#include "nsContentErrors.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSFrameConstructor.h"
#include "nsCSSRendering.h"
#ifdef IBMBIDI
#include "nsBidiPresUtils.h"
#endif // IBMBIDI
#include "nsIDOMHTMLBodyElement.h"
#include "nsIDOMHTMLHtmlElement.h"
static const int MIN_LINES_NEEDING_CURSOR = 20;
#define DISABLE_FLOAT_BREAKING_IN_COLUMNS
using namespace mozilla;
#ifdef DEBUG
#include "nsPrintfCString.h"
#include "nsBlockDebugFlags.h"
PRBool nsBlockFrame::gLamePaintMetrics;
PRBool nsBlockFrame::gLameReflowMetrics;
PRBool nsBlockFrame::gNoisy;
PRBool nsBlockFrame::gNoisyDamageRepair;
PRBool nsBlockFrame::gNoisyIntrinsic;
PRBool nsBlockFrame::gNoisyReflow;
PRBool nsBlockFrame::gReallyNoisyReflow;
PRBool nsBlockFrame::gNoisyFloatManager;
PRBool nsBlockFrame::gVerifyLines;
PRBool nsBlockFrame::gDisableResizeOpt;
PRInt32 nsBlockFrame::gNoiseIndent;
struct BlockDebugFlags {
const char* name;
PRBool* on;
};
static const BlockDebugFlags gFlags[] = {
{ "reflow", &nsBlockFrame::gNoisyReflow },
{ "really-noisy-reflow", &nsBlockFrame::gReallyNoisyReflow },
{ "intrinsic", &nsBlockFrame::gNoisyIntrinsic },
{ "float-manager", &nsBlockFrame::gNoisyFloatManager },
{ "verify-lines", &nsBlockFrame::gVerifyLines },
{ "damage-repair", &nsBlockFrame::gNoisyDamageRepair },
{ "lame-paint-metrics", &nsBlockFrame::gLamePaintMetrics },
{ "lame-reflow-metrics", &nsBlockFrame::gLameReflowMetrics },
{ "disable-resize-opt", &nsBlockFrame::gDisableResizeOpt },
};
#define NUM_DEBUG_FLAGS (sizeof(gFlags) / sizeof(gFlags[0]))
static void
ShowDebugFlags()
{
printf("Here are the available GECKO_BLOCK_DEBUG_FLAGS:\n");
const BlockDebugFlags* bdf = gFlags;
const BlockDebugFlags* end = gFlags + NUM_DEBUG_FLAGS;
for (; bdf < end; bdf++) {
printf(" %s\n", bdf->name);
}
printf("Note: GECKO_BLOCK_DEBUG_FLAGS is a comma separated list of flag\n");
printf("names (no whitespace)\n");
}
void
nsBlockFrame::InitDebugFlags()
{
static PRBool firstTime = PR_TRUE;
if (firstTime) {
firstTime = PR_FALSE;
char* flags = PR_GetEnv("GECKO_BLOCK_DEBUG_FLAGS");
if (flags) {
PRBool error = PR_FALSE;
for (;;) {
char* cm = PL_strchr(flags, ',');
if (cm) *cm = '\0';
PRBool found = PR_FALSE;
const BlockDebugFlags* bdf = gFlags;
const BlockDebugFlags* end = gFlags + NUM_DEBUG_FLAGS;
for (; bdf < end; bdf++) {
if (PL_strcasecmp(bdf->name, flags) == 0) {
*(bdf->on) = PR_TRUE;
printf("nsBlockFrame: setting %s debug flag on\n", bdf->name);
gNoisy = PR_TRUE;
found = PR_TRUE;
break;
}
}
if (!found) {
error = PR_TRUE;
}
if (!cm) break;
*cm = ',';
flags = cm + 1;
}
if (error) {
ShowDebugFlags();
}
}
}
}
#endif
// add in a sanity check for absurdly deep frame trees. See bug 42138
// can't just use IsFrameTreeTooDeep() because that method has side effects we don't want
#define MAX_DEPTH_FOR_LIST_RENUMBERING 200 // 200 open displayable tags is pretty unrealistic
//----------------------------------------------------------------------
// Debugging support code
#ifdef DEBUG
const char* nsBlockFrame::kReflowCommandType[] = {
"ContentChanged",
"StyleChanged",
"ReflowDirty",
"Timeout",
"UserDefined",
};
#endif
#ifdef REALLY_NOISY_FIRST_LINE
static void
DumpStyleGeneaology(nsIFrame* aFrame, const char* gap)
{
fputs(gap, stdout);
nsFrame::ListTag(stdout, aFrame);
printf(": ");
nsStyleContext* sc = aFrame->GetStyleContext();
while (nsnull != sc) {
nsStyleContext* psc;
printf("%p ", sc);
psc = sc->GetParent();
sc = psc;
}
printf("\n");
}
#endif
#ifdef REFLOW_STATUS_COVERAGE
static void
RecordReflowStatus(PRBool aChildIsBlock, nsReflowStatus aFrameReflowStatus)
{
static PRUint32 record[2];
// 0: child-is-block
// 1: child-is-inline
PRIntn index = 0;
if (!aChildIsBlock) index |= 1;
// Compute new status
PRUint32 newS = record[index];
if (NS_INLINE_IS_BREAK(aFrameReflowStatus)) {
if (NS_INLINE_IS_BREAK_BEFORE(aFrameReflowStatus)) {
newS |= 1;
}
else if (NS_FRAME_IS_NOT_COMPLETE(aFrameReflowStatus)) {
newS |= 2;
}
else {
newS |= 4;
}
}
else if (NS_FRAME_IS_NOT_COMPLETE(aFrameReflowStatus)) {
newS |= 8;
}
else {
newS |= 16;
}
// Log updates to the status that yield different values
if (record[index] != newS) {
record[index] = newS;
printf("record(%d): %02x %02x\n", index, record[0], record[1]);
}
}
#endif
// Destructor function for the overflowLines frame property
static void
DestroyOverflowLines(void* aPropertyValue)
{
NS_ERROR("Overflow lines should never be destroyed by the FramePropertyTable");
}
NS_DECLARE_FRAME_PROPERTY(LineCursorProperty, nsnull)
NS_DECLARE_FRAME_PROPERTY(OverflowLinesProperty, DestroyOverflowLines)
NS_DECLARE_FRAME_PROPERTY(OverflowOutOfFlowsProperty,
nsContainerFrame::DestroyFrameList)
//----------------------------------------------------------------------
nsIFrame*
NS_NewBlockFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, PRUint32 aFlags)
{
nsBlockFrame* it = new (aPresShell) nsBlockFrame(aContext);
if (it) {
it->SetFlags(aFlags);
}
return it;
}
NS_IMPL_FRAMEARENA_HELPERS(nsBlockFrame)
nsBlockFrame::~nsBlockFrame()
{
}
void
nsBlockFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
mAbsoluteContainer.DestroyFrames(this, aDestructRoot);
// Outside bullets are not in our child-list so check for them here
// and delete them when present.
if (mBullet && HaveOutsideBullet()) {
mBullet->DestroyFrom(aDestructRoot);
mBullet = nsnull;
}
mFloats.DestroyFramesFrom(aDestructRoot);
nsPresContext* presContext = PresContext();
nsLineBox::DeleteLineList(presContext, mLines, aDestructRoot);
// Now clear mFrames, since we've destroyed all the frames in it.
mFrames.Clear();
nsFrameList* pushedFloats = RemovePushedFloats();
if (pushedFloats) {
pushedFloats->DestroyFrom(aDestructRoot);
}
// destroy overflow lines now
nsLineList* overflowLines = RemoveOverflowLines();
if (overflowLines) {
nsLineBox::DeleteLineList(presContext, *overflowLines, aDestructRoot);
delete overflowLines;
}
{
nsAutoOOFFrameList oofs(this);
oofs.mList.DestroyFramesFrom(aDestructRoot);
// oofs is now empty and will remove the frame list property
}
nsBlockFrameSuper::DestroyFrom(aDestructRoot);
}
/* virtual */ nsILineIterator*
nsBlockFrame::GetLineIterator()
{
nsLineIterator* it = new nsLineIterator;
if (!it)
return nsnull;
const nsStyleVisibility* visibility = GetStyleVisibility();
nsresult rv = it->Init(mLines, visibility->mDirection == NS_STYLE_DIRECTION_RTL);
if (NS_FAILED(rv)) {
delete it;
return nsnull;
}
return it;
}
NS_QUERYFRAME_HEAD(nsBlockFrame)
NS_QUERYFRAME_ENTRY(nsBlockFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsBlockFrameSuper)
nsSplittableType
nsBlockFrame::GetSplittableType() const
{
return NS_FRAME_SPLITTABLE_NON_RECTANGULAR;
}
#ifdef DEBUG
NS_METHOD
nsBlockFrame::List(FILE* out, PRInt32 aIndent) const
{
IndentBy(out, aIndent);
ListTag(out);
#ifdef DEBUG_waterson
fprintf(out, " [parent=%p]", mParent);
#endif
if (HasView()) {
fprintf(out, " [view=%p]", static_cast<void*>(GetView()));
}
if (GetNextSibling()) {
fprintf(out, " next=%p", static_cast<void*>(GetNextSibling()));
}
// Output the flow linkage
if (nsnull != GetPrevInFlow()) {
fprintf(out, " prev-in-flow=%p", static_cast<void*>(GetPrevInFlow()));
}
if (nsnull != GetNextInFlow()) {
fprintf(out, " next-in-flow=%p", static_cast<void*>(GetNextInFlow()));
}
void* IBsibling = Properties().Get(IBSplitSpecialSibling());
if (IBsibling) {
fprintf(out, " IBSplitSpecialSibling=%p", IBsibling);
}
void* IBprevsibling = Properties().Get(IBSplitSpecialPrevSibling());
if (IBprevsibling) {
fprintf(out, " IBSplitSpecialPrevSibling=%p", IBprevsibling);
}
if (nsnull != mContent) {
fprintf(out, " [content=%p]", static_cast<void*>(mContent));
}
// Output the rect and state
fprintf(out, " {%d,%d,%d,%d}", mRect.x, mRect.y, mRect.width, mRect.height);
if (0 != mState) {
fprintf(out, " [state=%016llx]", mState);
}
nsBlockFrame* f = const_cast<nsBlockFrame*>(this);
if (f->HasOverflowRect()) {
nsRect overflowArea = f->GetOverflowRect();
fprintf(out, " [overflow=%d,%d,%d,%d]", overflowArea.x, overflowArea.y,
overflowArea.width, overflowArea.height);
}
PRInt32 numInlineLines = 0;
PRInt32 numBlockLines = 0;
if (!mLines.empty()) {
const_line_iterator line = begin_lines(), line_end = end_lines();
for ( ; line != line_end; ++line) {
if (line->IsBlock())
numBlockLines++;
else
numInlineLines++;
}
}
fprintf(out, " sc=%p(i=%d,b=%d)",
static_cast<void*>(mStyleContext), numInlineLines, numBlockLines);
nsIAtom* pseudoTag = mStyleContext->GetPseudo();
if (pseudoTag) {
nsAutoString atomString;
pseudoTag->ToString(atomString);
fprintf(out, " pst=%s",
NS_LossyConvertUTF16toASCII(atomString).get());
}
fputs("<\n", out);
aIndent++;
// Output the lines
if (!mLines.empty()) {
const_line_iterator line = begin_lines(), line_end = end_lines();
for ( ; line != line_end; ++line) {
line->List(out, aIndent);
}
}
// Output the overflow lines.
const nsLineList* overflowLines = GetOverflowLines();
if (overflowLines && !overflowLines->empty()) {
IndentBy(out, aIndent);
fputs("Overflow-lines<\n", out);
const_line_iterator line = overflowLines->begin(),
line_end = overflowLines->end();
for ( ; line != line_end; ++line) {
line->List(out, aIndent + 1);
}
IndentBy(out, aIndent);
fputs(">\n", out);
}
nsIAtom* listName = nsnull;
PRInt32 listIndex = 0;
for (;;) {
listName = GetAdditionalChildListName(listIndex++);
if (nsGkAtoms::overflowList == listName) {
continue; // skip the overflow list - we printed the overflow lines above
}
if (nsnull == listName) {
break;
}
nsIFrame* kid = GetFirstChild(listName);
if (kid) {
IndentBy(out, aIndent);
nsAutoString tmp;
if (nsnull != listName) {
listName->ToString(tmp);
fputs(NS_LossyConvertUTF16toASCII(tmp).get(), out);
}
fputs("<\n", out);
while (kid) {
kid->List(out, aIndent + 1);
kid = kid->GetNextSibling();
}
IndentBy(out, aIndent);
fputs(">\n", out);
}
}
aIndent--;
IndentBy(out, aIndent);
fputs(">\n", out);
return NS_OK;
}
NS_IMETHODIMP_(nsFrameState)
nsBlockFrame::GetDebugStateBits() const
{
// We don't want to include our cursor flag in the bits the
// regression tester looks at
return nsBlockFrameSuper::GetDebugStateBits() & ~NS_BLOCK_HAS_LINE_CURSOR;
}
NS_IMETHODIMP
nsBlockFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("Block"), aResult);
}
#endif
nsIAtom*
nsBlockFrame::GetType() const
{
return nsGkAtoms::blockFrame;
}
void
nsBlockFrame::InvalidateInternal(const nsRect& aDamageRect,
nscoord aX, nscoord aY, nsIFrame* aForChild,
PRUint32 aFlags)
{
// Optimize by suppressing invalidation of areas that are clipped out
// with CSS 'clip'.
const nsStyleDisplay* disp = GetStyleDisplay();
nsRect absPosClipRect;
if (GetAbsPosClipRect(disp, &absPosClipRect, GetSize())) {
// Restrict the invalidated area to abs-pos clip rect
// abs-pos clipping clips everything in the frame
nsRect r;
if (r.IntersectRect(aDamageRect, absPosClipRect - nsPoint(aX, aY))) {
nsBlockFrameSuper::InvalidateInternal(r, aX, aY, this, aFlags);
}
return;
}
nsBlockFrameSuper::InvalidateInternal(aDamageRect, aX, aY, this, aFlags);
}
nscoord
nsBlockFrame::GetBaseline() const
{
NS_ASSERTION(!NS_SUBTREE_DIRTY(this), "frame must not be dirty");
nscoord result;
if (nsLayoutUtils::GetLastLineBaseline(this, &result))
return result;
return nsFrame::GetBaseline();
}
/////////////////////////////////////////////////////////////////////////////
// Child frame enumeration
nsFrameList
nsBlockFrame::GetChildList(nsIAtom* aListName) const
{
if (nsGkAtoms::absoluteList == aListName) {
return mAbsoluteContainer.GetChildList();
}
else if (nsnull == aListName) {
return mFrames;
}
else if (aListName == nsGkAtoms::overflowList) {
// XXXbz once we start using nsFrameList for our overflow list, we
// could switch GetChildList to returning a |const nsFrameList&|.
nsLineList* overflowLines = GetOverflowLines();
return overflowLines ? nsFrameList(overflowLines->front()->mFirstChild,
overflowLines->back()->LastChild())
: nsFrameList::EmptyList();
}
else if (aListName == nsGkAtoms::overflowOutOfFlowList) {
const nsFrameList* list = GetOverflowOutOfFlows();
return list ? *list : nsFrameList::EmptyList();
}
else if (aListName == nsGkAtoms::pushedFloatsList) {
const nsFrameList* list = GetPushedFloats();
return list ? *list : nsFrameList::EmptyList();
}
else if (aListName == nsGkAtoms::floatList) {
return mFloats;
}
else if (aListName == nsGkAtoms::bulletList) {
return HaveOutsideBullet() ? nsFrameList(mBullet, mBullet)
: nsFrameList::EmptyList();
}
return nsContainerFrame::GetChildList(aListName);
}
#define NS_BLOCK_FRAME_OVERFLOW_OOF_LIST_INDEX (NS_CONTAINER_LIST_COUNT_INCL_OC + 0)
#define NS_BLOCK_FRAME_FLOAT_LIST_INDEX (NS_CONTAINER_LIST_COUNT_INCL_OC + 1)
#define NS_BLOCK_FRAME_BULLET_LIST_INDEX (NS_CONTAINER_LIST_COUNT_INCL_OC + 2)
#define NS_BLOCK_FRAME_ABSOLUTE_LIST_INDEX (NS_CONTAINER_LIST_COUNT_INCL_OC + 3)
#define NS_BLOCK_FRAME_PUSHED_FLOATS_LIST_INDEX (NS_CONTAINER_LIST_COUNT_INCL_OC + 4)
// If adding/removing lists, don't forget to update the count in nsBlockFrame.h
nsIAtom*
nsBlockFrame::GetAdditionalChildListName(PRInt32 aIndex) const
{
if (aIndex < NS_CONTAINER_LIST_COUNT_INCL_OC)
return nsContainerFrame::GetAdditionalChildListName(aIndex);
switch (aIndex) {
case NS_BLOCK_FRAME_FLOAT_LIST_INDEX:
return nsGkAtoms::floatList;
case NS_BLOCK_FRAME_BULLET_LIST_INDEX:
return nsGkAtoms::bulletList;
case NS_BLOCK_FRAME_OVERFLOW_OOF_LIST_INDEX:
return nsGkAtoms::overflowOutOfFlowList;
case NS_BLOCK_FRAME_ABSOLUTE_LIST_INDEX:
return nsGkAtoms::absoluteList;
case NS_BLOCK_FRAME_PUSHED_FLOATS_LIST_INDEX:
return nsGkAtoms::pushedFloatsList;
default:
return nsnull;
}
}
/* virtual */ PRBool
nsBlockFrame::IsContainingBlock() const
{
// The block wrappers we use to wrap blocks inside inlines aren't
// described in the CSS spec. We need to make them not be containing
// blocks for the cases where we care about the 'direction' property
// of an element's containing block.
// Since the parent of such a block is either a normal block or
// another such pseudo, this shouldn't cause anything bad to happen.
// Also the anonymous blocks inside table cells are not containing blocks.
nsIAtom *pseudoType = GetStyleContext()->GetPseudo();
return pseudoType != nsCSSAnonBoxes::mozAnonymousBlock &&
pseudoType != nsCSSAnonBoxes::mozAnonymousPositionedBlock &&
pseudoType != nsCSSAnonBoxes::cellContent;
}
/* virtual */ PRBool
nsBlockFrame::IsFloatContainingBlock() const
{
return PR_TRUE;
}
static void ReparentFrame(nsIFrame* aFrame, nsIFrame* aOldParent,
nsIFrame* aNewParent) {
NS_ASSERTION(aOldParent == aFrame->GetParent(),
"Parent not consistent with expectations");
aFrame->SetParent(aNewParent);
// When pushing and pulling frames we need to check for whether any
// views need to be reparented
nsHTMLContainerFrame::ReparentFrameView(aFrame->PresContext(), aFrame,
aOldParent, aNewParent);
}
//////////////////////////////////////////////////////////////////////
// Frame structure methods
//////////////////////////////////////////////////////////////////////
// Reflow methods
/* virtual */ void
nsBlockFrame::MarkIntrinsicWidthsDirty()
{
nsBlockFrame* dirtyBlock = static_cast<nsBlockFrame*>(GetFirstContinuation());
dirtyBlock->mMinWidth = NS_INTRINSIC_WIDTH_UNKNOWN;
dirtyBlock->mPrefWidth = NS_INTRINSIC_WIDTH_UNKNOWN;
if (!(GetStateBits() & NS_BLOCK_NEEDS_BIDI_RESOLUTION)) {
for (nsIFrame* frame = dirtyBlock; frame;
frame = frame->GetNextContinuation()) {
frame->AddStateBits(NS_BLOCK_NEEDS_BIDI_RESOLUTION);
}
}
nsBlockFrameSuper::MarkIntrinsicWidthsDirty();
}
/* virtual */ nscoord
nsBlockFrame::GetMinWidth(nsIRenderingContext *aRenderingContext)
{
nsIFrame* firstInFlow = GetFirstContinuation();
if (firstInFlow != this)
return firstInFlow->GetMinWidth(aRenderingContext);
DISPLAY_MIN_WIDTH(this, mMinWidth);
if (mMinWidth != NS_INTRINSIC_WIDTH_UNKNOWN)
return mMinWidth;
#ifdef DEBUG
if (gNoisyIntrinsic) {
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": GetMinWidth\n");
}
AutoNoisyIndenter indenter(gNoisyIntrinsic);
#endif
if (GetStateBits() & NS_BLOCK_NEEDS_BIDI_RESOLUTION)
ResolveBidi();
InlineMinWidthData data;
for (nsBlockFrame* curFrame = this; curFrame;
curFrame = static_cast<nsBlockFrame*>(curFrame->GetNextContinuation())) {
for (line_iterator line = curFrame->begin_lines(), line_end = curFrame->end_lines();
line != line_end; ++line)
{
#ifdef DEBUG
if (gNoisyIntrinsic) {
IndentBy(stdout, gNoiseIndent);
printf("line (%s%s)\n",
line->IsBlock() ? "block" : "inline",
line->IsEmpty() ? ", empty" : "");
}
AutoNoisyIndenter lineindent(gNoisyIntrinsic);
#endif
if (line->IsBlock()) {
data.ForceBreak(aRenderingContext);
data.currentLine = nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
line->mFirstChild, nsLayoutUtils::MIN_WIDTH);
data.ForceBreak(aRenderingContext);
} else {
if (!curFrame->GetPrevContinuation() &&
line == curFrame->begin_lines()) {
const nsStyleCoord &indent = GetStyleText()->mTextIndent;
if (indent.GetUnit() == eStyleUnit_Coord)
data.currentLine += indent.GetCoordValue();
}
// XXX Bug NNNNNN Should probably handle percentage text-indent.
data.line = &line;
data.lineContainer = curFrame;
nsIFrame *kid = line->mFirstChild;
for (PRInt32 i = 0, i_end = line->GetChildCount(); i != i_end;
++i, kid = kid->GetNextSibling()) {
kid->AddInlineMinWidth(aRenderingContext, &data);
}
}
#ifdef DEBUG
if (gNoisyIntrinsic) {
IndentBy(stdout, gNoiseIndent);
printf("min: [prevLines=%d currentLine=%d]\n",
data.prevLines, data.currentLine);
}
#endif
}
}
data.ForceBreak(aRenderingContext);
mMinWidth = data.prevLines;
return mMinWidth;
}
/* virtual */ nscoord
nsBlockFrame::GetPrefWidth(nsIRenderingContext *aRenderingContext)
{
nsIFrame* firstInFlow = GetFirstContinuation();
if (firstInFlow != this)
return firstInFlow->GetPrefWidth(aRenderingContext);
DISPLAY_PREF_WIDTH(this, mPrefWidth);
if (mPrefWidth != NS_INTRINSIC_WIDTH_UNKNOWN)
return mPrefWidth;
#ifdef DEBUG
if (gNoisyIntrinsic) {
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": GetPrefWidth\n");
}
AutoNoisyIndenter indenter(gNoisyIntrinsic);
#endif
if (GetStateBits() & NS_BLOCK_NEEDS_BIDI_RESOLUTION)
ResolveBidi();
InlinePrefWidthData data;
for (nsBlockFrame* curFrame = this; curFrame;
curFrame = static_cast<nsBlockFrame*>(curFrame->GetNextContinuation())) {
for (line_iterator line = curFrame->begin_lines(), line_end = curFrame->end_lines();
line != line_end; ++line)
{
#ifdef DEBUG
if (gNoisyIntrinsic) {
IndentBy(stdout, gNoiseIndent);
printf("line (%s%s)\n",
line->IsBlock() ? "block" : "inline",
line->IsEmpty() ? ", empty" : "");
}
AutoNoisyIndenter lineindent(gNoisyIntrinsic);
#endif
if (line->IsBlock()) {
data.ForceBreak(aRenderingContext);
data.currentLine = nsLayoutUtils::IntrinsicForContainer(aRenderingContext,
line->mFirstChild, nsLayoutUtils::PREF_WIDTH);
data.ForceBreak(aRenderingContext);
} else {
if (!curFrame->GetPrevContinuation() &&
line == curFrame->begin_lines()) {
const nsStyleCoord &indent = GetStyleText()->mTextIndent;
if (indent.GetUnit() == eStyleUnit_Coord)
data.currentLine += indent.GetCoordValue();
}
// XXX Bug NNNNNN Should probably handle percentage text-indent.
data.line = &line;
data.lineContainer = curFrame;
nsIFrame *kid = line->mFirstChild;
for (PRInt32 i = 0, i_end = line->GetChildCount(); i != i_end;
++i, kid = kid->GetNextSibling()) {
kid->AddInlinePrefWidth(aRenderingContext, &data);
}
}
#ifdef DEBUG
if (gNoisyIntrinsic) {
IndentBy(stdout, gNoiseIndent);
printf("pref: [prevLines=%d currentLine=%d]\n",
data.prevLines, data.currentLine);
}
#endif
}
}
data.ForceBreak(aRenderingContext);
mPrefWidth = data.prevLines;
return mPrefWidth;
}
nsRect
nsBlockFrame::ComputeTightBounds(gfxContext* aContext) const
{
// be conservative
if (GetStyleContext()->HasTextDecorations())
return GetOverflowRect();
return ComputeSimpleTightBounds(aContext);
}
static PRBool
AvailableSpaceShrunk(const nsRect& aOldAvailableSpace,
const nsRect& aNewAvailableSpace)
{
if (aNewAvailableSpace.width == 0) {
// Positions are not significant if the width is zero.
return aOldAvailableSpace.width != 0;
}
NS_ASSERTION(aOldAvailableSpace.x <= aNewAvailableSpace.x &&
aOldAvailableSpace.XMost() >= aNewAvailableSpace.XMost(),
"available space should never grow");
return aOldAvailableSpace.width != aNewAvailableSpace.width;
}
static nsSize
CalculateContainingBlockSizeForAbsolutes(const nsHTMLReflowState& aReflowState,
nsSize aFrameSize)
{
// The issue here is that for a 'height' of 'auto' the reflow state
// code won't know how to calculate the containing block height
// because it's calculated bottom up. So we use our own computed
// size as the dimensions.
nsIFrame* frame = aReflowState.frame;
nsSize cbSize(aFrameSize);
// Containing block is relative to the padding edge
const nsMargin& border =
aReflowState.mComputedBorderPadding - aReflowState.mComputedPadding;
cbSize.width -= border.LeftRight();
cbSize.height -= border.TopBottom();
if (frame->GetParent()->GetContent() == frame->GetContent() &&
frame->GetParent()->GetType() != nsGkAtoms::canvasFrame) {
// We are a wrapped frame for the content (and the wrapper is not the
// canvas frame, whose size is not meaningful here).
// Use the container's dimensions, if they have been precomputed.
// XXX This is a hack! We really should be waiting until the outermost
// frame is fully reflowed and using the resulting dimensions, even
// if they're intrinsic.
// In fact we should be attaching absolute children to the outermost
// frame and not always sticking them in block frames.
// First, find the reflow state for the outermost frame for this
// content.
const nsHTMLReflowState* aLastRS = &aReflowState;
const nsHTMLReflowState* lastButOneRS = &aReflowState;
while (aLastRS->parentReflowState &&
aLastRS->parentReflowState->frame->GetContent() == frame->GetContent()) {
lastButOneRS = aLastRS;
aLastRS = aLastRS->parentReflowState;
}
if (aLastRS != &aReflowState) {
// Scrollbars need to be specifically excluded, if present, because they are outside the
// padding-edge. We need better APIs for getting the various boxes from a frame.
nsIScrollableFrame* scrollFrame = do_QueryFrame(aLastRS->frame);
nsMargin scrollbars(0,0,0,0);
if (scrollFrame) {
scrollbars =
scrollFrame->GetDesiredScrollbarSizes(aLastRS->frame->PresContext(),
aLastRS->rendContext);
if (!lastButOneRS->mFlags.mAssumingHScrollbar) {
scrollbars.top = scrollbars.bottom = 0;
}
if (!lastButOneRS->mFlags.mAssumingVScrollbar) {
scrollbars.left = scrollbars.right = 0;
}
}
// We found a reflow state for the outermost wrapping frame, so use
// its computed metrics if available
if (aLastRS->ComputedWidth() != NS_UNCONSTRAINEDSIZE) {
cbSize.width = NS_MAX(0,
aLastRS->ComputedWidth() + aLastRS->mComputedPadding.LeftRight() - scrollbars.LeftRight());
}
if (aLastRS->ComputedHeight() != NS_UNCONSTRAINEDSIZE) {
cbSize.height = NS_MAX(0,
aLastRS->ComputedHeight() + aLastRS->mComputedPadding.TopBottom() - scrollbars.TopBottom());
}
}
}
return cbSize;
}
NS_IMETHODIMP
nsBlockFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsBlockFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aMetrics, aStatus);
#ifdef DEBUG
if (gNoisyReflow) {
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": begin reflow availSize=%d,%d computedSize=%d,%d\n",
aReflowState.availableWidth, aReflowState.availableHeight,
aReflowState.ComputedWidth(), aReflowState.ComputedHeight());
}
AutoNoisyIndenter indent(gNoisy);
PRTime start = LL_ZERO; // Initialize these variablies to silence the compiler.
PRInt32 ctc = 0; // We only use these if they are set (gLameReflowMetrics).
if (gLameReflowMetrics) {
start = PR_Now();
ctc = nsLineBox::GetCtorCount();
}
#endif
// See comment below about oldSize. Use *only* for the
// abs-pos-containing-block-size-change optimization!
nsSize oldSize = GetSize();
// Should we create a float manager?
nsAutoFloatManager autoFloatManager(const_cast<nsHTMLReflowState &>(aReflowState));
// XXXldb If we start storing the float manager in the frame rather
// than keeping it around only during reflow then we should create it
// only when there are actually floats to manage. Otherwise things
// like tables will gain significant bloat.
PRBool needFloatManager = nsBlockFrame::BlockNeedsFloatManager(this);
if (needFloatManager)
autoFloatManager.CreateFloatManager(aPresContext);
// OK, some lines may be reflowed. Blow away any saved line cursor because
// we may invalidate the nondecreasing combinedArea.y/yMost invariant,
// and we may even delete the line with the line cursor.
ClearLineCursor();
if (IsFrameTreeTooDeep(aReflowState, aMetrics)) {
#ifdef DEBUG_kipp
{
extern char* nsPresShell_ReflowStackPointerTop;
char marker;
char* newsp = (char*) &marker;
printf("XXX: frame tree is too deep; approx stack size = %d\n",
nsPresShell_ReflowStackPointerTop - newsp);
}
#endif
aStatus = NS_FRAME_COMPLETE;
return NS_OK;
}
PRBool marginRoot = BlockIsMarginRoot(this);
nsBlockReflowState state(aReflowState, aPresContext, this, aMetrics,
marginRoot, marginRoot, needFloatManager);
#ifdef IBMBIDI
if (GetStateBits() & NS_BLOCK_NEEDS_BIDI_RESOLUTION)
static_cast<nsBlockFrame*>(GetFirstContinuation())->ResolveBidi();
#endif // IBMBIDI
if (RenumberLists(aPresContext)) {
AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
}
nsresult rv = NS_OK;
// ALWAYS drain overflow. We never want to leave the previnflow's
// overflow lines hanging around; block reflow depends on the
// overflow line lists being cleared out between reflow passes.
DrainOverflowLines(state);
// Handle paginated overflow (see nsContainerFrame.h)
nsRect ocBounds;
nsReflowStatus ocStatus = NS_FRAME_COMPLETE;
if (GetPrevInFlow()) {
ReflowOverflowContainerChildren(aPresContext, aReflowState, ocBounds, 0,
ocStatus);
}
// Now that we're done cleaning up our overflow container lists, we can
// give |state| its nsOverflowContinuationTracker.
nsOverflowContinuationTracker tracker(aPresContext, this, PR_FALSE);
state.mOverflowTracker = &tracker;
// Drain & handle pushed floats
DrainPushedFloats(state);
nsRect fcBounds;
nsReflowStatus fcStatus = NS_FRAME_COMPLETE;
rv = ReflowPushedFloats(state, fcBounds, fcStatus);
NS_ENSURE_SUCCESS(rv, rv);
// If we're not dirty (which means we'll mark everything dirty later)
// and our width has changed, mark the lines dirty that we need to
// mark dirty for a resize reflow.
if (aReflowState.mFlags.mHResize)
PrepareResizeReflow(state);
mState &= ~NS_FRAME_FIRST_REFLOW;
// Now reflow...
rv = ReflowDirtyLines(state);
NS_ASSERTION(NS_SUCCEEDED(rv), "reflow dirty lines failed");
if (NS_FAILED(rv)) return rv;
NS_MergeReflowStatusInto(&state.mReflowStatus, ocStatus);
NS_MergeReflowStatusInto(&state.mReflowStatus, fcStatus);
// If we end in a BR with clear and affected floats continue,
// we need to continue, too.
if (NS_UNCONSTRAINEDSIZE != aReflowState.availableHeight &&
NS_FRAME_IS_COMPLETE(state.mReflowStatus) &&
state.mFloatManager->ClearContinues(FindTrailingClear())) {
NS_FRAME_SET_INCOMPLETE(state.mReflowStatus);
}
if (!NS_FRAME_IS_FULLY_COMPLETE(state.mReflowStatus)) {
if (GetOverflowLines() || GetPushedFloats()) {
state.mReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
}
#ifdef DEBUG_kipp
ListTag(stdout); printf(": block is not fully complete\n");
#endif
}
CheckFloats(state);
// Place the "marker" (bullet) frame if it is placed next to a block
// child.
//
// According to the CSS2 spec, section 12.6.1, the "marker" box
// participates in the height calculation of the list-item box's
// first line box.
//
// There are exactly two places a bullet can be placed: near the
// first or second line. It's only placed on the second line in a
// rare case: an empty first line followed by a second line that
// contains a block (example: <LI>\n<P>... ). This is where
// the second case can happen.
if (mBullet && HaveOutsideBullet() && !mLines.empty() &&
(mLines.front()->IsBlock() ||
(0 == mLines.front()->mBounds.height &&
mLines.front() != mLines.back() &&
mLines.begin().next()->IsBlock()))) {
// Reflow the bullet
nsHTMLReflowMetrics metrics;
// XXX Use the entire line when we fix bug 25888.
nsLayoutUtils::LinePosition position;
PRBool havePosition = nsLayoutUtils::GetFirstLinePosition(this, &position);
nscoord lineTop = havePosition ? position.mTop
: aReflowState.mComputedBorderPadding.top;
ReflowBullet(state, metrics, lineTop);
NS_ASSERTION(!BulletIsEmpty() || metrics.height == 0,
"empty bullet took up space");
if (havePosition && !BulletIsEmpty()) {
// We have some lines to align the bullet with.
// Doing the alignment using the baseline will also cater for
// bullets that are placed next to a child block (bug 92896)
// Tall bullets won't look particularly nice here...
nsRect bbox = mBullet->GetRect();
bbox.y = position.mBaseline - metrics.ascent;
mBullet->SetRect(bbox);
}
// Otherwise just leave the bullet where it is, up against our top padding.
}
// Compute our final size
nscoord bottomEdgeOfChildren;
ComputeFinalSize(aReflowState, state, aMetrics, &bottomEdgeOfChildren);
ComputeCombinedArea(aReflowState, aMetrics, bottomEdgeOfChildren);
// Factor overflow container child bounds into the overflow area
aMetrics.mOverflowArea.UnionRect(aMetrics.mOverflowArea, ocBounds);
// Factor pushed float child bounds into the overflow area
aMetrics.mOverflowArea.UnionRect(aMetrics.mOverflowArea, fcBounds);
// Let the absolutely positioned container reflow any absolutely positioned
// child frames that need to be reflowed, e.g., elements with a percentage
// based width/height
// We want to do this under either of two conditions:
// 1. If we didn't do the incremental reflow above.
// 2. If our size changed.
// Even though it's the padding edge that's the containing block, we
// can use our rect (the border edge) since if the border style
// changed, the reflow would have been targeted at us so we'd satisfy
// condition 1.
// XXX checking oldSize is bogus, there are various reasons we might have
// reflowed but our size might not have been changed to what we
// asked for (e.g., we ended up being pushed to a new page)
// When WillReflowAgainForClearance is true, we will reflow again without
// resetting the size. Because of this, we must not reflow our abs-pos children
// in that situation --- what we think is our "new size"
// will not be our real new size. This also happens to be more efficient.
if (mAbsoluteContainer.HasAbsoluteFrames()) {
PRBool haveInterrupt = aPresContext->HasPendingInterrupt();
if (aReflowState.WillReflowAgainForClearance() ||
haveInterrupt) {
// Make sure that when we reflow again we'll actually reflow all the abs
// pos frames that might conceivably depend on our size (or all of them,
// if we're dirty right now and interrupted; in that case we also need
// to mark them all with NS_FRAME_IS_DIRTY). Sadly, we can't do much
// better than that, because we don't really know what our size will be,
// and it might in fact not change on the followup reflow!
if (haveInterrupt && (GetStateBits() & NS_FRAME_IS_DIRTY)) {
mAbsoluteContainer.MarkAllFramesDirty();
} else {
mAbsoluteContainer.MarkSizeDependentFramesDirty();
}
} else {
nsRect childBounds;
nsSize containingBlockSize =
CalculateContainingBlockSizeForAbsolutes(aReflowState,
nsSize(aMetrics.width,
aMetrics.height));
// Mark frames that depend on changes we just made to this frame as dirty:
// Now we can assume that the padding edge hasn't moved.
// We need to reflow the absolutes if one of them depends on
// its placeholder position, or the containing block size in a
// direction in which the containing block size might have
// changed.
PRBool cbWidthChanged = aMetrics.width != oldSize.width;
PRBool isRoot = !GetContent()->GetParent();
// If isRoot and we have auto height, then we are the initial
// containing block and the containing block height is the
// viewport height, which can't change during incremental
// reflow.
PRBool cbHeightChanged =
!(isRoot && NS_UNCONSTRAINEDSIZE == aReflowState.ComputedHeight()) &&
aMetrics.height != oldSize.height;
rv = mAbsoluteContainer.Reflow(this, aPresContext, aReflowState,
state.mReflowStatus,
containingBlockSize.width,
containingBlockSize.height, PR_TRUE,
cbWidthChanged, cbHeightChanged,
&childBounds);
//XXXfr Why isn't this rv (and others in this file) checked/returned?
// Factor the absolutely positioned child bounds into the overflow area
aMetrics.mOverflowArea.UnionRect(aMetrics.mOverflowArea, childBounds);
}
}
// Determine if we need to repaint our border, background or outline
CheckInvalidateSizeChange(aMetrics);
FinishAndStoreOverflow(&aMetrics);
// Clear the float manager pointer in the block reflow state so we
// don't waste time translating the coordinate system back on a dead
// float manager.
if (needFloatManager)
state.mFloatManager = nsnull;
aStatus = state.mReflowStatus;
#ifdef DEBUG
if (gNoisyReflow) {
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": status=%x (%scomplete) metrics=%d,%d carriedMargin=%d",
aStatus, NS_FRAME_IS_COMPLETE(aStatus) ? "" : "not ",
aMetrics.width, aMetrics.height,
aMetrics.mCarriedOutBottomMargin.get());
if (HasOverflowRect()) {
printf(" combinedArea={%d,%d,%d,%d}",
aMetrics.mOverflowArea.x,
aMetrics.mOverflowArea.y,
aMetrics.mOverflowArea.width,
aMetrics.mOverflowArea.height);
}
printf("\n");
}
if (gLameReflowMetrics) {
PRTime end = PR_Now();
PRInt32 ectc = nsLineBox::GetCtorCount();
PRInt32 numLines = mLines.size();
if (!numLines) numLines = 1;
PRTime delta, perLineDelta, lines;
LL_I2L(lines, numLines);
LL_SUB(delta, end, start);
LL_DIV(perLineDelta, delta, lines);
ListTag(stdout);
char buf[400];
PR_snprintf(buf, sizeof(buf),
": %lld elapsed (%lld per line) (%d lines; %d new lines)",
delta, perLineDelta, numLines, ectc - ctc);
printf("%s\n", buf);
}
#endif
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aMetrics);
return rv;
}
PRBool
nsBlockFrame::CheckForCollapsedBottomMarginFromClearanceLine()
{
line_iterator begin = begin_lines();
line_iterator line = end_lines();
while (PR_TRUE) {
if (begin == line) {
return PR_FALSE;
}
--line;
if (line->mBounds.height != 0 || !line->CachedIsEmpty()) {
return PR_FALSE;
}
if (line->HasClearance()) {
return PR_TRUE;
}
}
// not reached
}
void
nsBlockFrame::ComputeFinalSize(const nsHTMLReflowState& aReflowState,
nsBlockReflowState& aState,
nsHTMLReflowMetrics& aMetrics,
nscoord* aBottomEdgeOfChildren)
{
const nsMargin& borderPadding = aState.BorderPadding();
#ifdef NOISY_FINAL_SIZE
ListTag(stdout);
printf(": mY=%d mIsBottomMarginRoot=%s mPrevBottomMargin=%d bp=%d,%d\n",
aState.mY, aState.GetFlag(BRS_ISBOTTOMMARGINROOT) ? "yes" : "no",
aState.mPrevBottomMargin,
borderPadding.top, borderPadding.bottom);
#endif
// Compute final width
aMetrics.width =
NSCoordSaturatingAdd(NSCoordSaturatingAdd(borderPadding.left,
aReflowState.ComputedWidth()),
borderPadding.right);
// Return bottom margin information
// rbs says he hit this assertion occasionally (see bug 86947), so
// just set the margin to zero and we'll figure out why later
//NS_ASSERTION(aMetrics.mCarriedOutBottomMargin.IsZero(),
// "someone else set the margin");
nscoord nonCarriedOutVerticalMargin = 0;
if (!aState.GetFlag(BRS_ISBOTTOMMARGINROOT)) {
// Apply rule from CSS 2.1 section 8.3.1. If we have some empty
// line with clearance and a non-zero top margin and all
// subsequent lines are empty, then we do not allow our children's
// carried out bottom margin to be carried out of us and collapse
// with our own bottom margin.
if (CheckForCollapsedBottomMarginFromClearanceLine()) {
// Convert the children's carried out margin to something that
// we will include in our height
nonCarriedOutVerticalMargin = aState.mPrevBottomMargin.get();
aState.mPrevBottomMargin.Zero();
}
aMetrics.mCarriedOutBottomMargin = aState.mPrevBottomMargin;
} else {
aMetrics.mCarriedOutBottomMargin.Zero();
}
nscoord bottomEdgeOfChildren = aState.mY + nonCarriedOutVerticalMargin;
// Shrink wrap our height around our contents.
if (aState.GetFlag(BRS_ISBOTTOMMARGINROOT) ||
NS_UNCONSTRAINEDSIZE != aReflowState.ComputedHeight()) {
// When we are a bottom-margin root make sure that our last
// childs bottom margin is fully applied. We also do this when
// we have a computed height, since in that case the carried out
// margin is not going to be applied anywhere, so we should note it
// here to be included in the overflow area.
// Apply the margin only if there's space for it.
if (bottomEdgeOfChildren < aState.mReflowState.availableHeight)
{
// Truncate bottom margin if it doesn't fit to our available height.
bottomEdgeOfChildren =
NS_MIN(bottomEdgeOfChildren + aState.mPrevBottomMargin.get(),
aState.mReflowState.availableHeight);
}
}
if (aState.GetFlag(BRS_FLOAT_MGR)) {
// Include the float manager's state to properly account for the
// bottom margin of any floated elements; e.g., inside a table cell.
nscoord floatHeight =
aState.ClearFloats(bottomEdgeOfChildren, NS_STYLE_CLEAR_LEFT_AND_RIGHT,
nsnull, nsFloatManager::DONT_CLEAR_PUSHED_FLOATS);
bottomEdgeOfChildren = NS_MAX(bottomEdgeOfChildren, floatHeight);
}
// Compute final height
if (NS_UNCONSTRAINEDSIZE != aReflowState.ComputedHeight()) {
// Figure out how much of the computed height should be
// applied to this frame.
nscoord computedHeightLeftOver = aReflowState.ComputedHeight();
if (GetPrevInFlow()) {
// Reduce the height by the computed height of prev-in-flows.
for (nsIFrame* prev = GetPrevInFlow(); prev; prev = prev->GetPrevInFlow()) {
computedHeightLeftOver -= prev->GetRect().height;
}
// We just subtracted our top-border padding, since it was included in the
// first frame's height. Add it back to get the content height.
computedHeightLeftOver += aReflowState.mComputedBorderPadding.top;
// We may have stretched the frame beyond its computed height. Oh well.
computedHeightLeftOver = NS_MAX(0, computedHeightLeftOver);
}
NS_ASSERTION(!( IS_TRUE_OVERFLOW_CONTAINER(this)
&& computedHeightLeftOver ),
"overflow container must not have computedHeightLeftOver");
aMetrics.height =
NSCoordSaturatingAdd(NSCoordSaturatingAdd(borderPadding.top,
computedHeightLeftOver),
borderPadding.bottom);
if (NS_FRAME_IS_NOT_COMPLETE(aState.mReflowStatus)
&& aMetrics.height < aReflowState.availableHeight) {
// We ran out of height on this page but we're incomplete
// Set status to complete except for overflow
NS_FRAME_SET_OVERFLOW_INCOMPLETE(aState.mReflowStatus);
}
if (NS_FRAME_IS_COMPLETE(aState.mReflowStatus)) {
if (computedHeightLeftOver > 0 &&
NS_UNCONSTRAINEDSIZE != aReflowState.availableHeight &&
aMetrics.height > aReflowState.availableHeight) {
// We don't fit and we consumed some of the computed height,
// so we should consume all the available height and then
// break. If our bottom border/padding straddles the break
// point, then this will increase our height and push the
// border/padding to the next page/column.
aMetrics.height = NS_MAX(aReflowState.availableHeight,
aState.mY + nonCarriedOutVerticalMargin);
NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus);
if (!GetNextInFlow())
aState.mReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
}
}
else {
// Use the current height; continuations will take up the rest.
// Do extend the height to at least consume the available
// height, otherwise our left/right borders (for example) won't
// extend all the way to the break.
aMetrics.height = NS_MAX(aReflowState.availableHeight,
aState.mY + nonCarriedOutVerticalMargin);
// ... but don't take up more height than is available
aMetrics.height = NS_MIN(aMetrics.height,
borderPadding.top + computedHeightLeftOver);
// XXX It's pretty wrong that our bottom border still gets drawn on
// on its own on the last-in-flow, even if we ran out of height
// here. We need GetSkipSides to check whether we ran out of content
// height in the current frame, not whether it's last-in-flow.
}
// Don't carry out a bottom margin when our height is fixed.
aMetrics.mCarriedOutBottomMargin.Zero();
}
else if (NS_FRAME_IS_COMPLETE(aState.mReflowStatus)) {
nscoord autoHeight = bottomEdgeOfChildren;
autoHeight -= borderPadding.top;
nscoord oldAutoHeight = autoHeight;
aReflowState.ApplyMinMaxConstraints(nsnull, &autoHeight);
if (autoHeight != oldAutoHeight) {
// Our min-height or max-height made our height change. Don't carry out
// our kids' bottom margins.
aMetrics.mCarriedOutBottomMargin.Zero();
}
autoHeight += borderPadding.top + borderPadding.bottom;
aMetrics.height = autoHeight;
}
else {
NS_ASSERTION(aReflowState.availableHeight != NS_UNCONSTRAINEDSIZE,
"Shouldn't be incomplete if availableHeight is UNCONSTRAINED.");
aMetrics.height = NS_MAX(aState.mY, aReflowState.availableHeight);
if (aReflowState.availableHeight == NS_UNCONSTRAINEDSIZE)
// This should never happen, but it does. See bug 414255
aMetrics.height = aState.mY;
}
if (IS_TRUE_OVERFLOW_CONTAINER(this) &&
NS_FRAME_IS_NOT_COMPLETE(aState.mReflowStatus)) {
// Overflow containers can only be overflow complete.
// Note that auto height overflow containers have no normal children
NS_ASSERTION(aMetrics.height == 0, "overflow containers must be zero-height");
NS_FRAME_SET_OVERFLOW_INCOMPLETE(aState.mReflowStatus);
}
// Screen out negative heights --- can happen due to integer overflows :-(
aMetrics.height = NS_MAX(0, aMetrics.height);
*aBottomEdgeOfChildren = bottomEdgeOfChildren;
#ifdef DEBUG_blocks
if (CRAZY_WIDTH(aMetrics.width) || CRAZY_HEIGHT(aMetrics.height)) {
ListTag(stdout);
printf(": WARNING: desired:%d,%d\n", aMetrics.width, aMetrics.height);
}
#endif
}
void
nsBlockFrame::ComputeCombinedArea(const nsHTMLReflowState& aReflowState,
nsHTMLReflowMetrics& aMetrics,
nscoord aBottomEdgeOfChildren)
{
// Compute the combined area of our children
// XXX_perf: This can be done incrementally. It is currently one of
// the things that makes incremental reflow O(N^2).
nsRect area(0, 0, aMetrics.width, aMetrics.height);
if (NS_STYLE_OVERFLOW_CLIP != aReflowState.mStyleDisplay->mOverflowX) {
PRBool inQuirks = (PresContext()->CompatibilityMode() == eCompatibility_NavQuirks);
for (line_iterator line = begin_lines(), line_end = end_lines();
line != line_end;
++line) {
// Text-shadow overflows
if (!inQuirks && line->IsInline()) {
nsRect shadowRect = nsLayoutUtils::GetTextShadowRectsUnion(line->GetCombinedArea(),
this);
area.UnionRect(area, shadowRect);
}
area.UnionRect(area, line->GetCombinedArea());
}
// Factor the bullet in; normally the bullet will be factored into
// the line-box's combined area. However, if the line is a block
// line then it won't; if there are no lines, it won't. So just
// factor it in anyway (it can't hurt if it was already done).
// XXXldb Can we just fix GetCombinedArea instead?
if (mBullet) {
area.UnionRect(area, mBullet->GetRect());
}
// Factor in the bottom edge of the children. Child frames
// will be added to the overflow area as we iterate through the lines,
// but their margins won't, so we need to account for bottom margins
// here. If we're a scrolled block then we also need to account
// for the scrollframe's padding, which is logically below the
// bottom margins of the children.
nscoord bottomEdgeOfContents = aBottomEdgeOfChildren;
if (GetStyleContext()->GetPseudo() == nsCSSAnonBoxes::scrolledContent) {
// We're a scrolled frame; the scrollframe's padding should be added
// to the bottom edge of the children
bottomEdgeOfContents += aReflowState.mComputedPadding.bottom;
}
area.height = NS_MAX(area.YMost(), bottomEdgeOfContents) - area.y;
}
#ifdef NOISY_COMBINED_AREA
ListTag(stdout);
printf(": ca=%d,%d,%d,%d\n", area.x, area.y, area.width, area.height);
#endif
aMetrics.mOverflowArea = area;
}
nsresult
nsBlockFrame::MarkLineDirty(line_iterator aLine, const nsLineList* aLineList)
{
// Mark aLine dirty
aLine->MarkDirty();
aLine->SetInvalidateTextRuns(PR_TRUE);
#ifdef DEBUG
if (gNoisyReflow) {
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": mark line %p dirty\n", static_cast<void*>(aLine.get()));
}
#endif
// Mark previous line dirty if it's an inline line so that it can
// maybe pullup something from the line just affected.
// XXX We don't need to do this if aPrevLine ends in a break-after...
if (aLine != (aLineList ? aLineList : &mLines)->front() &&
aLine->IsInline() &&
aLine.prev()->IsInline()) {
aLine.prev()->MarkDirty();
aLine.prev()->SetInvalidateTextRuns(PR_TRUE);
#ifdef DEBUG
if (gNoisyReflow) {
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": mark prev-line %p dirty\n",
static_cast<void*>(aLine.prev().get()));
}
#endif
}
return NS_OK;
}
nsresult
nsBlockFrame::PrepareResizeReflow(nsBlockReflowState& aState)
{
const nsStyleText* styleText = GetStyleText();
// See if we can try and avoid marking all the lines as dirty
PRBool tryAndSkipLines =
// The text must be left-aligned.
(NS_STYLE_TEXT_ALIGN_LEFT == styleText->mTextAlign ||
(NS_STYLE_TEXT_ALIGN_DEFAULT == styleText->mTextAlign &&
NS_STYLE_DIRECTION_LTR ==
aState.mReflowState.mStyleVisibility->mDirection) ||
(NS_STYLE_TEXT_ALIGN_END == styleText->mTextAlign &&
NS_STYLE_DIRECTION_RTL ==
aState.mReflowState.mStyleVisibility->mDirection)) &&
// The left content-edge must be a constant distance from the left
// border-edge.
GetStylePadding()->mPadding.GetLeftUnit() != eStyleUnit_Percent;
#ifdef DEBUG
if (gDisableResizeOpt) {
tryAndSkipLines = PR_FALSE;
}
if (gNoisyReflow) {
if (!tryAndSkipLines) {
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": marking all lines dirty: availWidth=%d textAlign=%d\n",
aState.mReflowState.availableWidth,
styleText->mTextAlign);
}
}
#endif
if (tryAndSkipLines) {
nscoord newAvailWidth = aState.mReflowState.mComputedBorderPadding.left +
aState.mReflowState.ComputedWidth();
NS_ASSERTION(NS_UNCONSTRAINEDSIZE != aState.mReflowState.mComputedBorderPadding.left &&
NS_UNCONSTRAINEDSIZE != aState.mReflowState.ComputedWidth(),
"math on NS_UNCONSTRAINEDSIZE");
#ifdef DEBUG
if (gNoisyReflow) {
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": trying to avoid marking all lines dirty\n");
}
#endif
for (line_iterator line = begin_lines(), line_end = end_lines();
line != line_end;
++line)
{
// We let child blocks make their own decisions the same
// way we are here.
if (line->IsBlock() ||
line->HasFloats() ||
((line != mLines.back() || GetNextInFlow()) // not the last line
&& !line->HasBreakAfter()) ||
line->ResizeReflowOptimizationDisabled() ||
line->IsImpactedByFloat() ||
(line->mBounds.XMost() > newAvailWidth)) {
line->MarkDirty();
}
#ifdef REALLY_NOISY_REFLOW
if (!line->IsBlock()) {
printf("PrepareResizeReflow thinks line %p is %simpacted by floats\n",
line.get(), line->IsImpactedByFloat() ? "" : "not ");
}
#endif
#ifdef DEBUG
if (gNoisyReflow && !line->IsDirty()) {
IndentBy(stdout, gNoiseIndent + 1);
printf("skipped: line=%p next=%p %s %s%s%s breakTypeBefore/After=%d/%d xmost=%d\n",
static_cast<void*>(line.get()),
static_cast<void*>((line.next() != end_lines() ? line.next().get() : nsnull)),
line->IsBlock() ? "block" : "inline",
line->HasBreakAfter() ? "has-break-after " : "",
line->HasFloats() ? "has-floats " : "",
line->IsImpactedByFloat() ? "impacted " : "",
line->GetBreakTypeBefore(), line->GetBreakTypeAfter(),
line->mBounds.XMost());
}
#endif
}
}
else {
// Mark everything dirty
for (line_iterator line = begin_lines(), line_end = end_lines();
line != line_end;
++line)
{
line->MarkDirty();
}
}
return NS_OK;
}
//----------------------------------------
/**
* Propagate reflow "damage" from from earlier lines to the current
* line. The reflow damage comes from the following sources:
* 1. The regions of float damage remembered during reflow.
* 2. The combination of nonzero |aDeltaY| and any impact by a float,
* either the previous reflow or now.
*
* When entering this function, |aLine| is still at its old position and
* |aDeltaY| indicates how much it will later be slid (assuming it
* doesn't get marked dirty and reflowed entirely).
*/
void
nsBlockFrame::PropagateFloatDamage(nsBlockReflowState& aState,
nsLineBox* aLine,
nscoord aDeltaY)
{
nsFloatManager *floatManager = aState.mReflowState.mFloatManager;
NS_ASSERTION((aState.mReflowState.parentReflowState &&
aState.mReflowState.parentReflowState->mFloatManager == floatManager) ||
aState.mReflowState.mBlockDelta == 0, "Bad block delta passed in");
// Check to see if there are any floats; if there aren't, there can't
// be any float damage
if (!floatManager->HasAnyFloats())
return;
// Check the damage region recorded in the float damage.
if (floatManager->HasFloatDamage()) {
// Need to check mBounds *and* mCombinedArea to find intersections
// with aLine's floats
nscoord lineYA = aLine->mBounds.y + aDeltaY;
nscoord lineYB = lineYA + aLine->mBounds.height;
nscoord lineYCombinedA = aLine->GetCombinedArea().y + aDeltaY;
nscoord lineYCombinedB = lineYCombinedA + aLine->GetCombinedArea().height;
if (floatManager->IntersectsDamage(lineYA, lineYB) ||
floatManager->IntersectsDamage(lineYCombinedA, lineYCombinedB)) {
aLine->MarkDirty();
return;
}
}
// Check if the line is moving relative to the float manager
if (aDeltaY + aState.mReflowState.mBlockDelta != 0) {
if (aLine->IsBlock()) {
// Unconditionally reflow sliding blocks; we only really need to reflow
// if there's a float impacting this block, but the current float manager
// makes it difficult to check that. Therefore, we let the child block
// decide what it needs to reflow.
aLine->MarkDirty();
} else {
PRBool wasImpactedByFloat = aLine->IsImpactedByFloat();
nsFlowAreaRect floatAvailableSpace =
aState.GetFloatAvailableSpaceForHeight(aLine->mBounds.y + aDeltaY,
aLine->mBounds.height,
nsnull);
#ifdef REALLY_NOISY_REFLOW
printf("nsBlockFrame::PropagateFloatDamage %p was = %d, is=%d\n",
this, wasImpactedByFloat, floatAvailableSpace.mHasFloats);
#endif
// Mark the line dirty if it was or is affected by a float
// We actually only really need to reflow if the amount of impact
// changes, but that's not straightforward to check
if (wasImpactedByFloat || floatAvailableSpace.mHasFloats) {
aLine->MarkDirty();
}
}
}
}
static void PlaceFrameView(nsIFrame* aFrame);
static PRBool LineHasClear(nsLineBox* aLine) {
return aLine->IsBlock()
? (aLine->GetBreakTypeBefore() ||
(aLine->mFirstChild->GetStateBits() & NS_BLOCK_HAS_CLEAR_CHILDREN) ||
!nsBlockFrame::BlockCanIntersectFloats(aLine->mFirstChild))
: aLine->HasFloatBreakAfter();
}
/**
* Reparent a whole list of floats from aOldParent to this block. The
* floats might be taken from aOldParent's overflow list. They will be
* removed from the list. They end up appended to our mFloats list.
*/
void
nsBlockFrame::ReparentFloats(nsIFrame* aFirstFrame,
nsBlockFrame* aOldParent, PRBool aFromOverflow,
PRBool aReparentSiblings) {
nsFrameList list;
aOldParent->CollectFloats(aFirstFrame, list, aFromOverflow, aReparentSiblings);
if (list.NotEmpty()) {
for (nsIFrame* f = list.FirstChild(); f; f = f->GetNextSibling()) {
ReparentFrame(f, aOldParent, this);
}
mFloats.AppendFrames(nsnull, list);
}
}
static void DumpLine(const nsBlockReflowState& aState, nsLineBox* aLine,
nscoord aDeltaY, PRInt32 aDeltaIndent) {
#ifdef DEBUG
if (nsBlockFrame::gNoisyReflow) {
nsRect lca(aLine->GetCombinedArea());
nsBlockFrame::IndentBy(stdout, nsBlockFrame::gNoiseIndent + aDeltaIndent);
printf("line=%p mY=%d dirty=%s oldBounds={%d,%d,%d,%d} oldCombinedArea={%d,%d,%d,%d} deltaY=%d mPrevBottomMargin=%d childCount=%d\n",
static_cast<void*>(aLine), aState.mY,
aLine->IsDirty() ? "yes" : "no",
aLine->mBounds.x, aLine->mBounds.y,
aLine->mBounds.width, aLine->mBounds.height,
lca.x, lca.y, lca.width, lca.height,
aDeltaY, aState.mPrevBottomMargin.get(), aLine->GetChildCount());
}
#endif
}
/**
* Reflow the dirty lines
*/
nsresult
nsBlockFrame::ReflowDirtyLines(nsBlockReflowState& aState)
{
nsresult rv = NS_OK;
PRBool keepGoing = PR_TRUE;
PRBool repositionViews = PR_FALSE; // should we really need this?
PRBool foundAnyClears = aState.mFloatBreakType != NS_STYLE_CLEAR_NONE;
PRBool willReflowAgain = PR_FALSE;
#ifdef DEBUG
if (gNoisyReflow) {
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": reflowing dirty lines");
printf(" computedWidth=%d\n", aState.mReflowState.ComputedWidth());
}
AutoNoisyIndenter indent(gNoisyReflow);
#endif
PRBool selfDirty = (GetStateBits() & NS_FRAME_IS_DIRTY) ||
(aState.mReflowState.mFlags.mVResize &&
(GetStateBits() & NS_FRAME_CONTAINS_RELATIVE_HEIGHT));
// Reflow our last line if our availableHeight has increased
// so that we (and our last child) pull up content as necessary
if (aState.mReflowState.availableHeight != NS_UNCONSTRAINEDSIZE
&& GetNextInFlow() && aState.mReflowState.availableHeight > mRect.height) {
line_iterator lastLine = end_lines();
if (lastLine != begin_lines()) {
--lastLine;
lastLine->MarkDirty();
}
}
// the amount by which we will slide the current line if it is not
// dirty
nscoord deltaY = 0;
// whether we did NOT reflow the previous line and thus we need to
// recompute the carried out margin before the line if we want to
// reflow it or if its previous margin is dirty
PRBool needToRecoverState = PR_FALSE;
// Float continuations were reflowed in ReflowPushedFloats
PRBool reflowedFloat = mFloats.NotEmpty() &&
(mFloats.FirstChild()->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT);
PRBool lastLineMovedUp = PR_FALSE;
// We save up information about BR-clearance here
PRUint8 inlineFloatBreakType = aState.mFloatBreakType;
line_iterator line = begin_lines(), line_end = end_lines();
// Reflow the lines that are already ours
for ( ; line != line_end; ++line, aState.AdvanceToNextLine()) {
DumpLine(aState, line, deltaY, 0);
#ifdef DEBUG
AutoNoisyIndenter indent2(gNoisyReflow);
#endif
if (selfDirty)
line->MarkDirty();
// This really sucks, but we have to look inside any blocks that have clear
// elements inside them.
// XXX what can we do smarter here?
if (!line->IsDirty() && line->IsBlock() &&
(line->mFirstChild->GetStateBits() & NS_BLOCK_HAS_CLEAR_CHILDREN)) {
line->MarkDirty();
}
nsIFrame *replacedBlock = nsnull;
if (line->IsBlock() &&
!nsBlockFrame::BlockCanIntersectFloats(line->mFirstChild)) {
replacedBlock = line->mFirstChild;
}
// We have to reflow the line if it's a block whose clearance
// might have changed, so detect that.
if (!line->IsDirty() &&
(line->GetBreakTypeBefore() != NS_STYLE_CLEAR_NONE ||
replacedBlock)) {
nscoord curY = aState.mY;
// See where we would be after applying any clearance due to
// BRs.
if (inlineFloatBreakType != NS_STYLE_CLEAR_NONE) {
curY = aState.ClearFloats(curY, inlineFloatBreakType);
}
nscoord newY =
aState.ClearFloats(curY, line->GetBreakTypeBefore(), replacedBlock);
if (line->HasClearance()) {
// Reflow the line if it might not have clearance anymore.
if (newY == curY
// aState.mY is the clearance point which should be the
// top border-edge of the block frame. If sliding the
// block by deltaY isn't going to put it in the predicted
// position, then we'd better reflow the line.
|| newY != line->mBounds.y + deltaY) {
line->MarkDirty();
}
} else {
// Reflow the line if the line might have clearance now.
if (curY != newY) {
line->MarkDirty();
}
}
}
// We might have to reflow a line that is after a clearing BR.
if (inlineFloatBreakType != NS_STYLE_CLEAR_NONE) {
aState.mY = aState.ClearFloats(aState.mY, inlineFloatBreakType);
if (aState.mY != line->mBounds.y + deltaY) {
// SlideLine is not going to put the line where the clearance
// put it. Reflow the line to be sure.
line->MarkDirty();
}
inlineFloatBreakType = NS_STYLE_CLEAR_NONE;
}
PRBool previousMarginWasDirty = line->IsPreviousMarginDirty();
if (previousMarginWasDirty) {
// If the previous margin is dirty, reflow the current line
line->MarkDirty();
line->ClearPreviousMarginDirty();
} else if (line->mBounds.YMost() + deltaY > aState.mBottomEdge) {
// Lines that aren't dirty but get slid past our height constraint must
// be reflowed.
line->MarkDirty();
}
// If we have a constrained height (i.e., breaking columns/pages),
// and the distance to the bottom might have changed, then we need
// to reflow any line that might have floats in it, both because the
// breakpoints within those floats may have changed and because we
// might have to push/pull the floats in their entirety.
// FIXME: What about a deltaY or height change that forces us to
// push lines? Why does that work?
if (!line->IsDirty() &&
aState.mReflowState.availableHeight != NS_UNCONSTRAINEDSIZE &&
(deltaY != 0 || aState.mReflowState.mFlags.mVResize) &&
(line->IsBlock() || line->HasFloats() || line->HadFloatPushed())) {
line->MarkDirty();
}
if (!line->IsDirty()) {
// See if there's any reflow damage that requires that we mark the
// line dirty.
PropagateFloatDamage(aState, line, deltaY);
}
if (needToRecoverState && line->IsDirty()) {
// We need to reconstruct the bottom margin only if we didn't
// reflow the previous line and we do need to reflow (or repair
// the top position of) the next line.
aState.ReconstructMarginAbove(line);
}
PRBool reflowedPrevLine = !needToRecoverState;
if (needToRecoverState) {
needToRecoverState = PR_FALSE;
// Update aState.mPrevChild as if we had reflowed all of the frames in
// this line. This is expensive in some cases, since it requires
// walking |GetNextSibling|.
if (line->IsDirty())
aState.mPrevChild = line.prev()->LastChild();
}
// Now repair the line and update |aState.mY| by calling
// |ReflowLine| or |SlideLine|.
// If we're going to reflow everything again, then no need to reflow
// the dirty line ... unless the line has floats, in which case we'd
// better reflow it now to refresh its float cache, which may contain
// dangling frame pointers! Ugh! This reflow of the line may be
// incorrect because we skipped reflowing previous lines (e.g., floats
// may be placed incorrectly), but that's OK because we'll mark the
// line dirty below under "if (aState.mReflowState.mDiscoveredClearance..."
if (line->IsDirty() && (line->HasFloats() || !willReflowAgain)) {
lastLineMovedUp = PR_TRUE;
PRBool maybeReflowingForFirstTime =
line->mBounds.x == 0 && line->mBounds.y == 0 &&
line->mBounds.width == 0 && line->mBounds.height == 0;
// Compute the dirty lines "before" YMost, after factoring in
// the running deltaY value - the running value is implicit in
// aState.mY.
nscoord oldY = line->mBounds.y;
nscoord oldYMost = line->mBounds.YMost();
NS_ASSERTION(!willReflowAgain || !line->IsBlock(),
"Don't reflow blocks while willReflowAgain is true, reflow of block abs-pos children depends on this");
// Reflow the dirty line. If it's an incremental reflow, then force
// it to invalidate the dirty area if necessary
rv = ReflowLine(aState, line, &keepGoing);
NS_ENSURE_SUCCESS(rv, rv);
if (aState.mReflowState.WillReflowAgainForClearance()) {
line->MarkDirty();
willReflowAgain = PR_TRUE;
// Note that once we've entered this state, every line that gets here
// (e.g. because it has floats) gets marked dirty and reflowed again.
// in the next pass. This is important, see above.
}
if (line->HasFloats()) {
reflowedFloat = PR_TRUE;
}
if (!keepGoing) {
DumpLine(aState, line, deltaY, -1);
if (0 == line->GetChildCount()) {
DeleteLine(aState, line, line_end);
}
break;
}
// Test to see whether the margin that should be carried out
// to the next line (NL) might have changed. In ReflowBlockFrame
// we call nextLine->MarkPreviousMarginDirty if the block's
// actual carried-out bottom margin changed. So here we only
// need to worry about the following effects:
// 1) the line was just created, and it might now be blocking
// a carried-out bottom margin from previous lines that
// used to reach NL from reaching NL
// 2) the line used to be empty, and is now not empty,
// thus blocking a carried-out bottom margin from previous lines
// that used to reach NL from reaching NL
// 3) the line wasn't empty, but now is, so a carried-out
// bottom margin from previous lines that didn't used to reach NL
// now does
// 4) the line might have changed in a way that affects NL's
// ShouldApplyTopMargin decision. The three things that matter
// are the line's emptiness, its adjacency to the top of the block,
// and whether it has clearance (the latter only matters if the block
// was and is adjacent to the top and empty).
//
// If the line is empty now, we can't reliably tell if the line was empty
// before, so we just assume it was and do nextLine->MarkPreviousMarginDirty.
// This means the checks in 4) are redundant; if the line is empty now
// we don't need to check 4), but if the line is not empty now and we're sure
// it wasn't empty before, any adjacency and clearance changes are irrelevant
// to the result of nextLine->ShouldApplyTopMargin.
if (line.next() != end_lines()) {
PRBool maybeWasEmpty = oldY == line.next()->mBounds.y;
PRBool isEmpty = line->CachedIsEmpty();
if (maybeReflowingForFirstTime /*1*/ ||
(isEmpty || maybeWasEmpty) /*2/3/4*/) {
line.next()->MarkPreviousMarginDirty();
// since it's marked dirty, nobody will care about |deltaY|
}
}
// If the line was just reflowed for the first time, then its
// old mBounds cannot be trusted so this deltaY computation is
// bogus. But that's OK because we just did
// MarkPreviousMarginDirty on the next line which will force it
// to be reflowed, so this computation of deltaY will not be
// used.
deltaY = line->mBounds.YMost() - oldYMost;
// Now do an interrupt check. We want to do this only in the case when we
// actually reflow the line, so that if we get back in here we'll get
// further on the reflow before interrupting.
aState.mPresContext->CheckForInterrupt(this);
} else {
aState.mOverflowTracker->Skip(line->mFirstChild, aState.mReflowStatus);
// Nop except for blocks (we don't create overflow container
// continuations for any inlines atm), so only checking mFirstChild
// is enough
lastLineMovedUp = deltaY < 0;
if (deltaY != 0)
SlideLine(aState, line, deltaY);
else
repositionViews = PR_TRUE;
NS_ASSERTION(!line->IsDirty() || !line->HasFloats(),
"Possibly stale float cache here!");
if (willReflowAgain && line->IsBlock()) {
// If we're going to reflow everything again, and this line is a block,
// then there is no need to recover float state. The line may contain
// other lines with floats, but in that case RecoverStateFrom would only
// add floats to the float manager. We don't need to do that because
// everything's going to get reflowed again "for real". Calling
// RecoverStateFrom in this situation could be lethal because the
// block's descendant lines may have float caches containing dangling
// frame pointers. Ugh!
// If this line is inline, then we need to recover its state now
// to make sure that we don't forget to move its floats by deltaY.
} else {
// XXX EVIL O(N^2) EVIL
aState.RecoverStateFrom(line, deltaY);
}
// Keep mY up to date in case we're propagating reflow damage
// and also because our final height may depend on it. If the
// line is inlines, then only update mY if the line is not
// empty, because that's what PlaceLine does. (Empty blocks may
// want to update mY, e.g. if they have clearance.)
if (line->IsBlock() || !line->CachedIsEmpty()) {
aState.mY = line->mBounds.YMost();
}
needToRecoverState = PR_TRUE;
if (reflowedPrevLine && !line->IsBlock() &&
aState.mPresContext->HasPendingInterrupt()) {
// Need to make sure to pull overflows from any prev-in-flows
for (nsIFrame* inlineKid = line->mFirstChild; inlineKid;
inlineKid = inlineKid->GetFirstChild(nsnull)) {
inlineKid->PullOverflowsFromPrevInFlow();
}
}
}
// Record if we need to clear floats before reflowing the next
// line. Note that inlineFloatBreakType will be handled and
// cleared before the next line is processed, so there is no
// need to combine break types here.
if (line->HasFloatBreakAfter()) {
inlineFloatBreakType = line->GetBreakTypeAfter();
}
if (LineHasClear(line.get())) {
foundAnyClears = PR_TRUE;
}
DumpLine(aState, line, deltaY, -1);
if (aState.mPresContext->HasPendingInterrupt()) {
willReflowAgain = PR_TRUE;
// Another option here might be to leave |line| clean if
// !HasPendingInterrupt() before the CheckForInterrupt() call, since in
// that case the line really did reflow as it should have. Not sure
// whether that would be safe, so doing this for now instead. Also not
// sure whether we really want to mark all lines dirty after an
// interrupt, but until we get better at propagating float damage we
// really do need to do it this way; see comments inside MarkLineDirty.
MarkLineDirtyForInterrupt(line);
}
}
// Handle BR-clearance from the last line of the block
if (inlineFloatBreakType != NS_STYLE_CLEAR_NONE) {
aState.mY = aState.ClearFloats(aState.mY, inlineFloatBreakType);
}
if (needToRecoverState) {
// Is this expensive?
aState.ReconstructMarginAbove(line);
// Update aState.mPrevChild as if we had reflowed all of the frames in
// the last line. This is expensive in some cases, since it requires
// walking |GetNextSibling|.
aState.mPrevChild = line.prev()->LastChild();
}
// Should we really have to do this?
if (repositionViews)
::PlaceFrameView(this);
// We can skip trying to pull up the next line if our height is constrained
// (so we can report being incomplete) and there is no next in flow or we
// were told not to or we know it will be futile, i.e.,
// -- the next in flow is not changing
// -- and we cannot have added more space for its first line to be
// pulled up into,
// -- it's an incremental reflow of a descendant
// -- and we didn't reflow any floats (so the available space
// didn't change)
// -- my chain of next-in-flows either has no first line, or its first
// line isn't dirty.
PRBool heightConstrained =
aState.mReflowState.availableHeight != NS_UNCONSTRAINEDSIZE;
PRBool skipPull = willReflowAgain && heightConstrained;
if (!skipPull && heightConstrained && aState.mNextInFlow &&
(aState.mReflowState.mFlags.mNextInFlowUntouched &&
!lastLineMovedUp &&
!(GetStateBits() & NS_FRAME_IS_DIRTY) &&
!reflowedFloat)) {
// We'll place lineIter at the last line of this block, so that
// nsBlockInFlowLineIterator::Next() will take us to the first
// line of my next-in-flow-chain. (But first, check that I
// have any lines -- if I don't, just bail out of this
// optimization.)
line_iterator lineIter = this->end_lines();
if (lineIter != this->begin_lines()) {
lineIter--; // I have lines; step back from dummy iterator to last line.
nsBlockInFlowLineIterator bifLineIter(this, lineIter, PR_FALSE);
// Check for next-in-flow-chain's first line.
// (First, see if there is such a line, and second, see if it's clean)
if (!bifLineIter.Next() ||
!bifLineIter.GetLine()->IsDirty()) {
skipPull=PR_TRUE;
}
}
}
if (skipPull && aState.mNextInFlow) {
NS_ASSERTION(heightConstrained, "Height should be constrained here\n");
if (IS_TRUE_OVERFLOW_CONTAINER(aState.mNextInFlow))
NS_FRAME_SET_OVERFLOW_INCOMPLETE(aState.mReflowStatus);
else
NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus);
}
if (!skipPull && aState.mNextInFlow) {
// Pull data from a next-in-flow if there's still room for more
// content here.
while (keepGoing && (nsnull != aState.mNextInFlow)) {
// Grab first line from our next-in-flow
nsBlockFrame* nextInFlow = aState.mNextInFlow;
line_iterator nifLine = nextInFlow->begin_lines();
nsLineBox *toMove;
PRBool toMoveIsOverflowLine;
if (nifLine != nextInFlow->end_lines()) {
toMove = nifLine;
nextInFlow->mLines.erase(nifLine);
toMoveIsOverflowLine = PR_FALSE;
} else {
// Grab an overflow line if there are any
nsLineList* overflowLines = nextInFlow->GetOverflowLines();
if (!overflowLines) {
aState.mNextInFlow =
static_cast<nsBlockFrame*>(nextInFlow->GetNextInFlow());
continue;
}
nifLine = overflowLines->begin();
NS_ASSERTION(nifLine != overflowLines->end(),
"Stored overflow line list should not be empty");
toMove = nifLine;
nextInFlow->RemoveOverflowLines();
nifLine = overflowLines->erase(nifLine);
if (nifLine != overflowLines->end()) {
// We need to this remove-and-put-back dance because we want
// to avoid making the overflow line list empty while it's
// stored in the property (because the property has the
// invariant that the list is never empty).
nextInFlow->SetOverflowLines(overflowLines);
} else {
delete overflowLines;
}
toMoveIsOverflowLine = PR_TRUE;
}
if (0 == toMove->GetChildCount()) {
// The line is empty. Try the next one.
NS_ASSERTION(nsnull == toMove->mFirstChild, "bad empty line");
aState.FreeLineBox(toMove);
continue;
}
// XXX move to a subroutine: run-in, overflow, pullframe and this do this
// Make the children in the line ours.
nsIFrame* frame = toMove->mFirstChild;
nsIFrame* lastFrame = nsnull;
PRInt32 n = toMove->GetChildCount();
while (--n >= 0) {
ReparentFrame(frame, nextInFlow, this);
lastFrame = frame;
frame = frame->GetNextSibling();
}
NS_ASSERTION(lastFrame == toMove->LastChild(), "Unexpected lastFrame");
NS_ASSERTION(aState.mPrevChild || mLines.empty(), "should have a prevchild here");
NS_ASSERTION(aState.mPrevChild == mFrames.LastChild(),
"Incorrect aState.mPrevChild before inserting line at end");
// Shift toMove's frames into our mFrames list.
if (toMoveIsOverflowLine) {
// Pulling from an overflow list
// XXXbz If we switch overflow lines to nsFrameList, we should
// change this SetNextSibling call.
lastFrame->SetNextSibling(nsnull);
} else {
// Pulling from nextInFlow->mFrames
nsFrameList::FrameLinkEnumerator linkToBreak(nextInFlow->mFrames, lastFrame);
nextInFlow->mFrames.ExtractHead(linkToBreak);
}
nsFrameList newFrames(toMove->mFirstChild, lastFrame);
mFrames.AppendFrames(nsnull, newFrames);
// Add line to our line list, and set its last child as our new prev-child
line = mLines.before_insert(end_lines(), toMove);
aState.mPrevChild = lastFrame;
NS_ASSERTION(aState.mPrevChild == mFrames.LastChild(),
"Incorrect aState.mPrevChild after inserting line at end");
// Reparent floats whose placeholders are in the line.
ReparentFloats(toMove->mFirstChild, nextInFlow, toMoveIsOverflowLine, PR_TRUE);
DumpLine(aState, toMove, deltaY, 0);
#ifdef DEBUG
AutoNoisyIndenter indent2(gNoisyReflow);
#endif
if (aState.mPresContext->HasPendingInterrupt()) {
MarkLineDirtyForInterrupt(line);
} else {
// Now reflow it and any lines that it makes during it's reflow
// (we have to loop here because reflowing the line may cause a new
// line to be created; see SplitLine's callers for examples of
// when this happens).
while (line != end_lines()) {
rv = ReflowLine(aState, line, &keepGoing);
NS_ENSURE_SUCCESS(rv, rv);
if (aState.mReflowState.WillReflowAgainForClearance()) {
line->MarkDirty();
keepGoing = PR_FALSE;
NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus);
break;
}
DumpLine(aState, line, deltaY, -1);
if (!keepGoing) {
if (0 == line->GetChildCount()) {
DeleteLine(aState, line, line_end);
}
break;
}
if (LineHasClear(line.get())) {
foundAnyClears = PR_TRUE;
}
if (aState.mPresContext->CheckForInterrupt(this)) {
MarkLineDirtyForInterrupt(line);
break;
}
// If this is an inline frame then its time to stop
++line;
aState.AdvanceToNextLine();
}
}
}
if (NS_FRAME_IS_NOT_COMPLETE(aState.mReflowStatus)) {
aState.mReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
} //XXXfr shouldn't set this flag when nextinflow has no lines
}
// Handle an odd-ball case: a list-item with no lines
if (mBullet && HaveOutsideBullet() && mLines.empty()) {
nsHTMLReflowMetrics metrics;
ReflowBullet(aState, metrics,
aState.mReflowState.mComputedBorderPadding.top);
NS_ASSERTION(!BulletIsEmpty() || metrics.height == 0,
"empty bullet took up space");
if (!BulletIsEmpty()) {
// There are no lines so we have to fake up some y motion so that
// we end up with *some* height.
if (metrics.ascent == nsHTMLReflowMetrics::ASK_FOR_BASELINE &&
!nsLayoutUtils::GetFirstLineBaseline(mBullet, &metrics.ascent)) {
metrics.ascent = metrics.height;
}
nsIRenderingContext *rc = aState.mReflowState.rendContext;
nsLayoutUtils::SetFontFromStyle(rc, GetStyleContext());
nsCOMPtr<nsIFontMetrics> fm;
rc->GetFontMetrics(*getter_AddRefs(fm));
nscoord minAscent =
nsLayoutUtils::GetCenteredFontBaseline(fm, aState.mMinLineHeight);
nscoord minDescent = aState.mMinLineHeight - minAscent;
aState.mY += NS_MAX(minAscent, metrics.ascent) +
NS_MAX(minDescent, metrics.height - metrics.ascent);
nscoord offset = minAscent - metrics.ascent;
if (offset > 0) {
mBullet->SetRect(mBullet->GetRect() + nsPoint(0, offset));
}
}
}
if (foundAnyClears) {
AddStateBits(NS_BLOCK_HAS_CLEAR_CHILDREN);
} else {
RemoveStateBits(NS_BLOCK_HAS_CLEAR_CHILDREN);
}
#ifdef DEBUG
if (gNoisyReflow) {
IndentBy(stdout, gNoiseIndent - 1);
ListTag(stdout);
printf(": done reflowing dirty lines (status=%x)\n",
aState.mReflowStatus);
}
#endif
return rv;
}
static void MarkAllDescendantLinesDirty(nsBlockFrame* aBlock)
{
nsLineList::iterator line = aBlock->begin_lines();
nsLineList::iterator endLine = aBlock->end_lines();
while (line != endLine) {
if (line->IsBlock()) {
nsIFrame* f = line->mFirstChild;
nsBlockFrame* bf = nsLayoutUtils::GetAsBlock(f);
if (bf) {
MarkAllDescendantLinesDirty(bf);
}
}
line->MarkDirty();
++line;
}
}
void
nsBlockFrame::MarkLineDirtyForInterrupt(nsLineBox* aLine)
{
aLine->MarkDirty();
// Just checking NS_FRAME_IS_DIRTY is ok, because we've already
// marked the lines that need to be marked dirty based on our
// vertical resize stuff. So we'll definitely reflow all those kids;
// the only question is how they should behave.
if (GetStateBits() & NS_FRAME_IS_DIRTY) {
// Mark all our child frames dirty so we make sure to reflow them
// later.
PRInt32 n = aLine->GetChildCount();
for (nsIFrame* f = aLine->mFirstChild; n > 0;
f = f->GetNextSibling(), --n) {
f->AddStateBits(NS_FRAME_IS_DIRTY);
}
// And mark all the floats whose reflows we might be skipping dirty too.
if (aLine->HasFloats()) {
for (nsFloatCache* fc = aLine->GetFirstFloat(); fc; fc = fc->Next()) {
fc->mFloat->AddStateBits(NS_FRAME_IS_DIRTY);
}
}
} else {
// Dirty all the descendant lines of block kids to handle float damage,
// since our nsFloatManager will go away by the next time we're reflowing.
// XXXbz Can we do something more like what PropagateFloatDamage does?
// Would need to sort out the exact business with mBlockDelta for that....
// This marks way too much dirty. If we ever make this better, revisit
// which lines we mark dirty in the interrupt case in ReflowDirtyLines.
nsBlockFrame* bf = nsLayoutUtils::GetAsBlock(aLine->mFirstChild);
if (bf) {
MarkAllDescendantLinesDirty(bf);
}
}
}
void
nsBlockFrame::DeleteLine(nsBlockReflowState& aState,
nsLineList::iterator aLine,
nsLineList::iterator aLineEnd)
{
NS_PRECONDITION(0 == aLine->GetChildCount(), "can't delete !empty line");
if (0 == aLine->GetChildCount()) {
NS_ASSERTION(aState.mCurrentLine == aLine,
"using function more generally than designed, "
"but perhaps OK now");
nsLineBox *line = aLine;
aLine = mLines.erase(aLine);
aState.FreeLineBox(line);
// Mark the previous margin of the next line dirty since we need to
// recompute its top position.
if (aLine != aLineEnd)
aLine->MarkPreviousMarginDirty();
}
}
/**
* Reflow a line. The line will either contain a single block frame
* or contain 1 or more inline frames. aKeepReflowGoing indicates
* whether or not the caller should continue to reflow more lines.
*/
nsresult
nsBlockFrame::ReflowLine(nsBlockReflowState& aState,
line_iterator aLine,
PRBool* aKeepReflowGoing)
{
nsresult rv = NS_OK;
NS_ABORT_IF_FALSE(aLine->GetChildCount(), "reflowing empty line");
// Setup the line-layout for the new line
aState.mCurrentLine = aLine;
aLine->ClearDirty();
aLine->InvalidateCachedIsEmpty();
aLine->ClearHadFloatPushed();
// Now that we know what kind of line we have, reflow it
if (aLine->IsBlock()) {
nsRect oldBounds = aLine->mFirstChild->GetRect();
nsRect oldCombinedArea(aLine->GetCombinedArea());
rv = ReflowBlockFrame(aState, aLine, aKeepReflowGoing);
nsRect newBounds = aLine->mFirstChild->GetRect();
// We expect blocks to damage any area inside their bounds that is
// dirty; however, if the frame changes size or position then we
// need to do some repainting.
// XXX roc --- the above statement is ambiguous about whether 'bounds'
// means the frame's bounds or overflowArea, and in fact this is a source
// of much confusion and bugs. Thus the following hack considers *both*
// overflowArea and bounds. This should be considered a temporary hack
// until we decide how it's really supposed to work.
// Note that we have a similar hack in nsTableFrame::InvalidateFrame.
nsRect lineCombinedArea(aLine->GetCombinedArea());
if (oldCombinedArea.TopLeft() != lineCombinedArea.TopLeft() ||
oldBounds.TopLeft() != newBounds.TopLeft()) {
// The block has moved, and so to be safe we need to repaint
// XXX We need to improve on this...
nsRect dirtyRect;
dirtyRect.UnionRect(oldCombinedArea, lineCombinedArea);
#ifdef NOISY_BLOCK_INVALIDATE
printf("%p invalidate 6 (%d, %d, %d, %d)\n",
this, dirtyRect.x, dirtyRect.y, dirtyRect.width, dirtyRect.height);
#endif
Invalidate(dirtyRect);
} else {
nsRect combinedAreaHStrip, combinedAreaVStrip;
nsRect boundsHStrip, boundsVStrip;
nsLayoutUtils::GetRectDifferenceStrips(oldBounds, newBounds,
&boundsHStrip, &boundsVStrip);
nsLayoutUtils::GetRectDifferenceStrips(oldCombinedArea, lineCombinedArea,
&combinedAreaHStrip,
&combinedAreaVStrip);
#ifdef NOISY_BLOCK_INVALIDATE
printf("%p invalidate boundsVStrip (%d, %d, %d, %d)\n",
this, boundsVStrip.x, boundsVStrip.y, boundsVStrip.width, boundsVStrip.height);
printf("%p invalidate boundsHStrip (%d, %d, %d, %d)\n",
this, boundsHStrip.x, boundsHStrip.y, boundsHStrip.width, boundsHStrip.height);
printf("%p invalidate combinedAreaVStrip (%d, %d, %d, %d)\n",
this, combinedAreaVStrip.x, combinedAreaVStrip.y, combinedAreaVStrip.width, combinedAreaVStrip.height);
printf("%p invalidate combinedAreaHStrip (%d, %d, %d, %d)\n",
this, combinedAreaHStrip.x, combinedAreaHStrip.y, combinedAreaHStrip.width, combinedAreaHStrip.height);
#endif
// The first thing Invalidate does is check if the rect is empty, so
// don't bother doing that here.
Invalidate(boundsVStrip);
Invalidate(boundsHStrip);
Invalidate(combinedAreaVStrip);
Invalidate(combinedAreaHStrip);
}
}
else {
nsRect oldCombinedArea(aLine->GetCombinedArea());
aLine->SetLineWrapped(PR_FALSE);
rv = ReflowInlineFrames(aState, aLine, aKeepReflowGoing);
// We don't really know what changed in the line, so use the union
// of the old and new combined areas
nsRect dirtyRect;
dirtyRect.UnionRect(oldCombinedArea, aLine->GetCombinedArea());
#ifdef NOISY_BLOCK_INVALIDATE
printf("%p invalidate (%d, %d, %d, %d)\n",
this, dirtyRect.x, dirtyRect.y, dirtyRect.width, dirtyRect.height);
if (aLine->IsForceInvalidate())
printf(" dirty line is %p\n", static_cast<void*>(aLine.get());
#endif
Invalidate(dirtyRect);
}
return rv;
}
nsIFrame*
nsBlockFrame::PullFrame(nsBlockReflowState& aState,
line_iterator aLine)
{
// First check our remaining lines.
if (end_lines() != aLine.next()) {
return PullFrameFrom(aState, aLine, this, PR_FALSE, aLine.next());
}
NS_ASSERTION(!GetOverflowLines(),
"Our overflow lines should have been removed at the start of reflow");
// Try each next-in-flow.
nsBlockFrame* nextInFlow = aState.mNextInFlow;
while (nextInFlow) {
// first normal lines, then overflow lines
if (!nextInFlow->mLines.empty()) {
return PullFrameFrom(aState, aLine, nextInFlow, PR_FALSE,
nextInFlow->mLines.begin());
}
nsLineList* overflowLines = nextInFlow->GetOverflowLines();
if (overflowLines) {
return PullFrameFrom(aState, aLine, nextInFlow, PR_TRUE,
overflowLines->begin());
}
nextInFlow = static_cast<nsBlockFrame*>(nextInFlow->GetNextInFlow());
aState.mNextInFlow = nextInFlow;
}
return nsnull;
}
nsIFrame*
nsBlockFrame::PullFrameFrom(nsBlockReflowState& aState,
nsLineBox* aLine,
nsBlockFrame* aFromContainer,
PRBool aFromOverflowLine,
nsLineList::iterator aFromLine)
{
nsLineBox* fromLine = aFromLine;
NS_ABORT_IF_FALSE(fromLine, "bad line to pull from");
NS_ABORT_IF_FALSE(fromLine->GetChildCount(), "empty line");
NS_ABORT_IF_FALSE(aLine->GetChildCount(), "empty line");
NS_ASSERTION(fromLine->IsBlock() == fromLine->mFirstChild->GetStyleDisplay()->IsBlockOutside(),
"Disagreement about whether it's a block or not");
if (fromLine->IsBlock()) {
// If our line is not empty and the child in aFromLine is a block
// then we cannot pull up the frame into this line. In this case
// we stop pulling.
return nsnull;
}
// Take frame from fromLine
nsIFrame* frame = fromLine->mFirstChild;
nsIFrame* newFirstChild = frame->GetNextSibling();
if (aFromContainer != this) {
NS_ASSERTION(aState.mPrevChild == aLine->LastChild(),
"mPrevChild should be the LastChild of the line we are adding to");
// The frame is being pulled from a next-in-flow; therefore we
// need to add it to our sibling list.
if (NS_LIKELY(!aFromOverflowLine)) {
NS_ASSERTION(aFromLine == aFromContainer->mLines.begin(),
"should only pull from first line");
// Pulling from the next-in-flow's normal line list
aFromContainer->mFrames.RemoveFrame(frame);
} else {
// Pulling from the next-in-flow's overflow list
// XXXbz If we switch overflow lines to nsFrameList, we should
// change this SetNextSibling call.
frame->SetNextSibling(nsnull);
}
// When pushing and pulling frames we need to check for whether any
// views need to be reparented
NS_ASSERTION(frame->GetParent() == aFromContainer, "unexpected parent frame");
ReparentFrame(frame, aFromContainer, this);
mFrames.InsertFrame(nsnull, aState.mPrevChild, frame);
// The frame might have (or contain) floats that need to be
// brought over too.
ReparentFloats(frame, aFromContainer, aFromOverflowLine, PR_TRUE);
}
// when aFromContainer is 'this', then aLine->LastChild()'s next sibling
// is already set correctly.
aLine->SetChildCount(aLine->GetChildCount() + 1);
PRInt32 fromLineChildCount = fromLine->GetChildCount();
if (0 != --fromLineChildCount) {
// Mark line dirty now that we pulled a child
fromLine->SetChildCount(fromLineChildCount);
fromLine->MarkDirty();
fromLine->mFirstChild = newFirstChild;
}
else {
// Free up the fromLine now that it's empty
// Its bounds might need to be redrawn, though.
// XXX WHY do we invalidate the bounds AND the combined area? doesn't
// the combined area always enclose the bounds?
Invalidate(fromLine->mBounds);
nsLineList* fromLineList = aFromOverflowLine
? aFromContainer->RemoveOverflowLines()
: &aFromContainer->mLines;
if (aFromLine.next() != fromLineList->end())
aFromLine.next()->MarkPreviousMarginDirty();
Invalidate(fromLine->GetCombinedArea());
fromLineList->erase(aFromLine);
// aFromLine is now invalid
aState.FreeLineBox(fromLine);
// Put any remaining overflow lines back.
if (aFromOverflowLine) {
if (!fromLineList->empty()) {
aFromContainer->SetOverflowLines(fromLineList);
} else {
delete fromLineList;
// Now any iterators into fromLineList are invalid (but
// aFromLine already was invalidated above)
}
}
}
#ifdef DEBUG
VerifyLines(PR_TRUE);
#endif
return frame;
}
static void
PlaceFrameView(nsIFrame* aFrame)
{
if (aFrame->HasView())
nsContainerFrame::PositionFrameView(aFrame);
else
nsContainerFrame::PositionChildViews(aFrame);
}
void
nsBlockFrame::SlideLine(nsBlockReflowState& aState,
nsLineBox* aLine, nscoord aDY)
{
NS_PRECONDITION(aDY != 0, "why slide a line nowhere?");
Invalidate(aLine->GetCombinedArea());
// Adjust line state
aLine->SlideBy(aDY);
Invalidate(aLine->GetCombinedArea());
// Adjust the frames in the line
nsIFrame* kid = aLine->mFirstChild;
if (!kid) {
return;
}
if (aLine->IsBlock()) {
if (aDY) {
nsPoint p = kid->GetPosition();
p.y += aDY;
kid->SetPosition(p);
}
// Make sure the frame's view and any child views are updated
::PlaceFrameView(kid);
}
else {
// Adjust the Y coordinate of the frames in the line.
// Note: we need to re-position views even if aDY is 0, because
// one of our parent frames may have moved and so the view's position
// relative to its parent may have changed
PRInt32 n = aLine->GetChildCount();
while (--n >= 0) {
if (aDY) {
nsPoint p = kid->GetPosition();
p.y += aDY;
kid->SetPosition(p);
}
// Make sure the frame's view and any child views are updated
::PlaceFrameView(kid);
kid = kid->GetNextSibling();
}
}
}
NS_IMETHODIMP
nsBlockFrame::AttributeChanged(PRInt32 aNameSpaceID,
nsIAtom* aAttribute,
PRInt32 aModType)
{
nsresult rv = nsBlockFrameSuper::AttributeChanged(aNameSpaceID,
aAttribute, aModType);
if (NS_FAILED(rv)) {
return rv;
}
if (nsGkAtoms::start == aAttribute) {
nsPresContext* presContext = PresContext();
// XXX Not sure if this is necessary anymore
if (RenumberLists(presContext)) {
presContext->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eStyleChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
}
else if (nsGkAtoms::value == aAttribute) {
const nsStyleDisplay* styleDisplay = GetStyleDisplay();
if (NS_STYLE_DISPLAY_LIST_ITEM == styleDisplay->mDisplay) {
// Search for the closest ancestor that's a block frame. We
// make the assumption that all related list items share a
// common block parent.
// XXXldb I think that's a bad assumption.
nsBlockFrame* blockParent = nsLayoutUtils::FindNearestBlockAncestor(this);
// Tell the enclosing block frame to renumber list items within
// itself
if (nsnull != blockParent) {
nsPresContext* presContext = PresContext();
// XXX Not sure if this is necessary anymore
if (blockParent->RenumberLists(presContext)) {
presContext->PresShell()->
FrameNeedsReflow(blockParent, nsIPresShell::eStyleChange,
NS_FRAME_HAS_DIRTY_CHILDREN);
}
}
}
}
return rv;
}
static inline PRBool
IsPaddingZero(nsStyleUnit aUnit, const nsStyleCoord &aCoord)
{
return ((aUnit == eStyleUnit_Coord && aCoord.GetCoordValue() == 0) ||
(aUnit == eStyleUnit_Percent && aCoord.GetPercentValue() == 0.0));
}
/* virtual */ PRBool
nsBlockFrame::IsSelfEmpty()
{
// Blocks which are margin-roots (including inline-blocks) cannot be treated
// as empty for margin-collapsing and other purposes. They're more like
// replaced elements.
if (GetStateBits() & NS_BLOCK_MARGIN_ROOT)
return PR_FALSE;
const nsStylePosition* position = GetStylePosition();
switch (position->mMinHeight.GetUnit()) {
case eStyleUnit_Coord:
if (position->mMinHeight.GetCoordValue() != 0)
return PR_FALSE;
break;
case eStyleUnit_Percent:
if (position->mMinHeight.GetPercentValue() != 0.0f)
return PR_FALSE;
break;
default:
return PR_FALSE;
}
switch (position->mHeight.GetUnit()) {
case eStyleUnit_Auto:
break;
case eStyleUnit_Coord:
if (position->mHeight.GetCoordValue() != 0)
return PR_FALSE;
break;
case eStyleUnit_Percent:
if (position->mHeight.GetPercentValue() != 0.0f)
return PR_FALSE;
break;
default:
return PR_FALSE;
}
const nsStyleBorder* border = GetStyleBorder();
const nsStylePadding* padding = GetStylePadding();
if (border->GetActualBorderWidth(NS_SIDE_TOP) != 0 ||
border->GetActualBorderWidth(NS_SIDE_BOTTOM) != 0 ||
!IsPaddingZero(padding->mPadding.GetTopUnit(),
padding->mPadding.GetTop()) ||
!IsPaddingZero(padding->mPadding.GetBottomUnit(),
padding->mPadding.GetBottom())) {
return PR_FALSE;
}
if (HaveOutsideBullet() && !BulletIsEmpty()) {
return PR_FALSE;
}
return PR_TRUE;
}
PRBool
nsBlockFrame::CachedIsEmpty()
{
if (!IsSelfEmpty()) {
return PR_FALSE;
}
for (line_iterator line = begin_lines(), line_end = end_lines();
line != line_end;
++line)
{
if (!line->CachedIsEmpty())
return PR_FALSE;
}
return PR_TRUE;
}
PRBool
nsBlockFrame::IsEmpty()
{
if (!IsSelfEmpty()) {
return PR_FALSE;
}
for (line_iterator line = begin_lines(), line_end = end_lines();
line != line_end;
++line)
{
if (!line->IsEmpty())
return PR_FALSE;
}
return PR_TRUE;
}
PRBool
nsBlockFrame::ShouldApplyTopMargin(nsBlockReflowState& aState,
nsLineBox* aLine)
{
if (aState.GetFlag(BRS_APPLYTOPMARGIN)) {
// Apply short-circuit check to avoid searching the line list
return PR_TRUE;
}
if (!aState.IsAdjacentWithTop()) {
// If we aren't at the top Y coordinate then something of non-zero
// height must have been placed. Therefore the childs top-margin
// applies.
aState.SetFlag(BRS_APPLYTOPMARGIN, PR_TRUE);
return PR_TRUE;
}
// Determine if this line is "essentially" the first line
line_iterator line = begin_lines();
if (aState.GetFlag(BRS_HAVELINEADJACENTTOTOP)) {
line = aState.mLineAdjacentToTop;
}
while (line != aLine) {
if (!line->CachedIsEmpty() || line->HasClearance()) {
// A line which precedes aLine is non-empty, or has clearance,
// so therefore the top margin applies.
aState.SetFlag(BRS_APPLYTOPMARGIN, PR_TRUE);
return PR_TRUE;
}
// No need to apply the top margin if the line has floats. We
// should collapse anyway (bug 44419)
++line;
aState.SetFlag(BRS_HAVELINEADJACENTTOTOP, PR_TRUE);
aState.mLineAdjacentToTop = line;
}
// The line being reflowed is "essentially" the first line in the
// block. Therefore its top-margin will be collapsed by the
// generational collapsing logic with its parent (us).
return PR_FALSE;
}
nsresult
nsBlockFrame::ReflowBlockFrame(nsBlockReflowState& aState,
line_iterator aLine,
PRBool* aKeepReflowGoing)
{
NS_PRECONDITION(*aKeepReflowGoing, "bad caller");
nsresult rv = NS_OK;
nsIFrame* frame = aLine->mFirstChild;
if (!frame) {
NS_ASSERTION(PR_FALSE, "program error - unexpected empty line");
return NS_ERROR_NULL_POINTER;
}
// Prepare the block reflow engine
const nsStyleDisplay* display = frame->GetStyleDisplay();
nsBlockReflowContext brc(aState.mPresContext, aState.mReflowState);
PRUint8 breakType = display->mBreakType;
if (NS_STYLE_CLEAR_NONE != aState.mFloatBreakType) {
breakType = nsLayoutUtils::CombineBreakType(breakType,
aState.mFloatBreakType);
aState.mFloatBreakType = NS_STYLE_CLEAR_NONE;
}
// Clear past floats before the block if the clear style is not none
aLine->SetBreakTypeBefore(breakType);
// See if we should apply the top margin. If the block frame being
// reflowed is a continuation (non-null prev-in-flow) then we don't
// apply its top margin because it's not significant. Otherwise, dig
// deeper.
PRBool applyTopMargin =
!frame->GetPrevInFlow() && ShouldApplyTopMargin(aState, aLine);
if (applyTopMargin) {
// The HasClearance setting is only valid if ShouldApplyTopMargin
// returned PR_FALSE (in which case the top-margin-root set our
// clearance flag). Otherwise clear it now. We'll set it later on
// ourselves if necessary.
aLine->ClearHasClearance();
}
PRBool treatWithClearance = aLine->HasClearance();
PRBool mightClearFloats = breakType != NS_STYLE_CLEAR_NONE;
nsIFrame *replacedBlock = nsnull;
if (!nsBlockFrame::BlockCanIntersectFloats(frame)) {
mightClearFloats = PR_TRUE;
replacedBlock = frame;
}
// If our top margin was counted as part of some parents top-margin
// collapse and we are being speculatively reflowed assuming this
// frame DID NOT need clearance, then we need to check that
// assumption.
if (!treatWithClearance && !applyTopMargin && mightClearFloats &&
aState.mReflowState.mDiscoveredClearance) {
nscoord curY = aState.mY + aState.mPrevBottomMargin.get();
nscoord clearY = aState.ClearFloats(curY, breakType, replacedBlock);
if (clearY != curY) {
// Looks like that assumption was invalid, we do need
// clearance. Tell our ancestor so it can reflow again. It is
// responsible for actually setting our clearance flag before
// the next reflow.
treatWithClearance = PR_TRUE;
// Only record the first frame that requires clearance
if (!*aState.mReflowState.mDiscoveredClearance) {
*aState.mReflowState.mDiscoveredClearance = frame;
}
aState.mPrevChild = frame;
// Exactly what we do now is flexible since we'll definitely be
// reflowed.
return NS_OK;
}
}
if (treatWithClearance) {
applyTopMargin = PR_TRUE;
}
nsIFrame* clearanceFrame = nsnull;
nscoord startingY = aState.mY;
nsCollapsingMargin incomingMargin = aState.mPrevBottomMargin;
nscoord clearance;
// Save the original position of the frame so that we can reposition
// its view as needed.
nsPoint originalPosition = frame->GetPosition();
while (PR_TRUE) {
// Save the frame's current position. We might need it later.
nscoord passOriginalY = frame->GetRect().y;
clearance = 0;
nscoord topMargin = 0;
PRBool mayNeedRetry = PR_FALSE;
if (applyTopMargin) {
// Precompute the blocks top margin value so that we can get the
// correct available space (there might be a float that's
// already been placed below the aState.mPrevBottomMargin
// Setup a reflowState to get the style computed margin-top
// value. We'll use a reason of `resize' so that we don't fudge
// any incremental reflow state.
// The availSpace here is irrelevant to our needs - all we want
// out if this setup is the margin-top value which doesn't depend
// on the childs available space.
// XXX building a complete nsHTMLReflowState just to get the margin-top
// seems like a waste. And we do this for almost every block!
nsSize availSpace(aState.mContentArea.width, NS_UNCONSTRAINEDSIZE);
nsHTMLReflowState reflowState(aState.mPresContext, aState.mReflowState,
frame, availSpace);
if (treatWithClearance) {
aState.mY += aState.mPrevBottomMargin.get();
aState.mPrevBottomMargin.Zero();
}
// Now compute the collapsed margin-top value into aState.mPrevBottomMargin, assuming
// that all child margins collapse down to clearanceFrame.
nsBlockReflowContext::ComputeCollapsedTopMargin(reflowState,
&aState.mPrevBottomMargin, clearanceFrame, &mayNeedRetry);
// XXX optimization; we could check the collapsing children to see if they are sure
// to require clearance, and so avoid retrying them
if (clearanceFrame) {
// Don't allow retries on the second pass. The clearance decisions for the
// blocks whose top-margins collapse with ours are now fixed.
mayNeedRetry = PR_FALSE;
}
if (!treatWithClearance && !clearanceFrame && mightClearFloats) {
// We don't know if we need clearance and this is the first,
// optimistic pass. So determine whether *this block* needs
// clearance. Note that we do not allow the decision for whether
// this block has clearance to change on the second pass; that
// decision is only allowed to be made under the optimistic
// first pass.
nscoord curY = aState.mY + aState.mPrevBottomMargin.get();
nscoord clearY = aState.ClearFloats(curY, breakType, replacedBlock);
if (clearY != curY) {
// Looks like we need clearance and we didn't know about it already. So
// recompute collapsed margin
treatWithClearance = PR_TRUE;
// Remember this decision, needed for incremental reflow
aLine->SetHasClearance();
// Apply incoming margins
aState.mY += aState.mPrevBottomMargin.get();
aState.mPrevBottomMargin.Zero();
// Compute the collapsed margin again, ignoring the incoming margin this time
mayNeedRetry = PR_FALSE;
nsBlockReflowContext::ComputeCollapsedTopMargin(reflowState,
&aState.mPrevBottomMargin, clearanceFrame, &mayNeedRetry);
}
}
// Temporarily advance the running Y value so that the
// GetAvailableSpace method will return the right available
// space. This undone as soon as the horizontal margins are
// computed.
topMargin = aState.mPrevBottomMargin.get();
if (treatWithClearance) {
nscoord currentY = aState.mY;
// advance mY to the clear position.
aState.mY = aState.ClearFloats(aState.mY, breakType, replacedBlock);
// Compute clearance. It's the amount we need to add to the top
// border-edge of the frame, after applying collapsed margins
// from the frame and its children, to get it to line up with
// the bottom of the floats. The former is currentY + topMargin,
// the latter is the current aState.mY.
// Note that negative clearance is possible
clearance = aState.mY - (currentY + topMargin);
// Add clearance to our top margin while we compute available
// space for the frame
topMargin += clearance;
// Note that aState.mY should stay where it is: at the top
// border-edge of the frame
} else {
// Advance aState.mY to the top border-edge of the frame.
aState.mY += topMargin;
}
}
// Here aState.mY is the top border-edge of the block.
// Compute the available space for the block
nsFlowAreaRect floatAvailableSpace = aState.GetFloatAvailableSpace();
#ifdef REALLY_NOISY_REFLOW
printf("setting line %p isImpacted to %s\n",
aLine.get(), floatAvailableSpace.mHasFloats?"true":"false");
#endif
aLine->SetLineIsImpactedByFloat(floatAvailableSpace.mHasFloats);
nsRect availSpace;
aState.ComputeBlockAvailSpace(frame, display, floatAvailableSpace,
replacedBlock != nsnull, availSpace);
// Now put the Y coordinate back to the top of the top-margin +
// clearance, and flow the block.
aState.mY -= topMargin;
availSpace.y -= topMargin;
if (NS_UNCONSTRAINEDSIZE != availSpace.height) {
availSpace.height += topMargin;
// When there is a pushed float, clearance could equal
// NS_UNCONSTRAINEDSIZE (FIXME: is that really a good idea?), but
// we don't want that to change a constrained height to an
// unconstrained one.
if (NS_UNCONSTRAINEDSIZE == availSpace.height) {
--availSpace.height;
}
}
// Reflow the block into the available space
// construct the html reflow state for the block. ReflowBlock
// will initialize it
nsHTMLReflowState blockHtmlRS(aState.mPresContext, aState.mReflowState, frame,
nsSize(availSpace.width, availSpace.height));
blockHtmlRS.mFlags.mHasClearance = aLine->HasClearance();
nsFloatManager::SavedState floatManagerState;
if (mayNeedRetry) {
blockHtmlRS.mDiscoveredClearance = &clearanceFrame;
aState.mFloatManager->PushState(&floatManagerState);
} else if (!applyTopMargin) {
blockHtmlRS.mDiscoveredClearance = aState.mReflowState.mDiscoveredClearance;
}
nsReflowStatus frameReflowStatus = NS_FRAME_COMPLETE;
rv = brc.ReflowBlock(availSpace, applyTopMargin, aState.mPrevBottomMargin,
clearance, aState.IsAdjacentWithTop(),
aLine.get(), blockHtmlRS, frameReflowStatus, aState);
// If this was a second-pass reflow and the block's vertical position
// changed, invalidates from the first pass might have happened in the
// wrong places. Invalidate the entire overflow rect at the new position.
if (!mayNeedRetry && clearanceFrame &&
frame->GetRect().y != passOriginalY) {
Invalidate(frame->GetOverflowRect() + frame->GetPosition());
}
NS_ENSURE_SUCCESS(rv, rv);
if (mayNeedRetry && clearanceFrame) {
aState.mFloatManager->PopState(&floatManagerState);
aState.mY = startingY;
aState.mPrevBottomMargin = incomingMargin;
continue;
}
aState.mPrevChild = frame;
if (blockHtmlRS.WillReflowAgainForClearance()) {
// If an ancestor of ours is going to reflow for clearance, we
// need to avoid calling PlaceBlock, because it unsets dirty bits
// on the child block (both itself, and through its call to
// nsFrame::DidReflow), and those dirty bits imply dirtiness for
// all of the child block, including the lines it didn't reflow.
NS_ASSERTION(originalPosition == frame->GetPosition(),
"we need to call PositionChildViews");
return NS_OK;
}
#if defined(REFLOW_STATUS_COVERAGE)
RecordReflowStatus(PR_TRUE, frameReflowStatus);
#endif
if (NS_INLINE_IS_BREAK_BEFORE(frameReflowStatus)) {
// None of the child block fits.
PushLines(aState, aLine.prev());
*aKeepReflowGoing = PR_FALSE;
NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus);
}
else {
// Note: line-break-after a block is a nop
// Try to place the child block.
// Don't force the block to fit if we have positive clearance, because
// pushing it to the next page would give it more room.
// Don't force the block to fit if it's impacted by a float. If it is,
// then pushing it to the next page would give it more room. Note that
// isImpacted doesn't include impact from the block's own floats.
PRBool forceFit = aState.IsAdjacentWithTop() && clearance <= 0 &&
!floatAvailableSpace.mHasFloats;
nsCollapsingMargin collapsedBottomMargin;
nsRect combinedArea(0,0,0,0);
*aKeepReflowGoing = brc.PlaceBlock(blockHtmlRS, forceFit, aLine.get(),
collapsedBottomMargin,
aLine->mBounds, combinedArea, frameReflowStatus);
if (aLine->SetCarriedOutBottomMargin(collapsedBottomMargin)) {
line_iterator nextLine = aLine;
++nextLine;
if (nextLine != end_lines()) {
nextLine->MarkPreviousMarginDirty();
}
}
aLine->SetCombinedArea(combinedArea);
if (*aKeepReflowGoing) {
// Some of the child block fit
// Advance to new Y position
nscoord newY = aLine->mBounds.YMost();
aState.mY = newY;
// Continue the block frame now if it didn't completely fit in
// the available space.
if (!NS_FRAME_IS_FULLY_COMPLETE(frameReflowStatus)) {
PRBool madeContinuation;
rv = CreateContinuationFor(aState, nsnull, frame, madeContinuation);
NS_ENSURE_SUCCESS(rv, rv);
nsIFrame* nextFrame = frame->GetNextInFlow();
NS_ASSERTION(nextFrame, "We're supposed to have a next-in-flow by now");
if (NS_FRAME_IS_NOT_COMPLETE(frameReflowStatus)) {
// If nextFrame used to be an overflow container, make it a normal block
if (!madeContinuation &&
(NS_FRAME_IS_OVERFLOW_CONTAINER & nextFrame->GetStateBits())) {
aState.mOverflowTracker->Finish(frame);
nsContainerFrame* parent =
static_cast<nsContainerFrame*>(nextFrame->GetParent());
rv = parent->StealFrame(aState.mPresContext, nextFrame);
NS_ENSURE_SUCCESS(rv, rv);
if (parent != this)
ReparentFrame(nextFrame, parent, this);
mFrames.InsertFrame(nsnull, frame, nextFrame);
madeContinuation = PR_TRUE; // needs to be added to mLines
nextFrame->RemoveStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
frameReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
}
// Push continuation to a new line, but only if we actually made one.
if (madeContinuation) {
nsLineBox* line = aState.NewLineBox(nextFrame, 1, PR_TRUE);
NS_ENSURE_TRUE(line, NS_ERROR_OUT_OF_MEMORY);
mLines.after_insert(aLine, line);
}
PushLines(aState, aLine);
NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus);
// If we need to reflow the continuation of the block child,
// then we'd better reflow our continuation
if (frameReflowStatus & NS_FRAME_REFLOW_NEXTINFLOW) {
aState.mReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
// We also need to make that continuation's line dirty so
// it gets reflowed when we reflow our next in flow. The
// nif's line must always be either a line of the nif's
// parent block (only if we didn't make a continuation) or
// else one of our own overflow lines. In the latter case
// the line is already marked dirty, so just handle the
// first case.
if (!madeContinuation) {
nsBlockFrame* nifBlock =
nsLayoutUtils::GetAsBlock(nextFrame->GetParent());
NS_ASSERTION(nifBlock,
"A block's child's next in flow's parent must be a block!");
for (line_iterator line = nifBlock->begin_lines(),
line_end = nifBlock->end_lines(); line != line_end; ++line) {
if (line->Contains(nextFrame)) {
line->MarkDirty();
break;
}
}
}
}
*aKeepReflowGoing = PR_FALSE;
// The bottom margin for a block is only applied on the last
// flow block. Since we just continued the child block frame,
// we know that line->mFirstChild is not the last flow block
// therefore zero out the running margin value.
#ifdef NOISY_VERTICAL_MARGINS
ListTag(stdout);
printf(": reflow incomplete, frame=");
nsFrame::ListTag(stdout, frame);
printf(" prevBottomMargin=%d, setting to zero\n",
aState.mPrevBottomMargin);
#endif
aState.mPrevBottomMargin.Zero();
}
else { // frame is complete but its overflow is not complete
// Disconnect the next-in-flow and put it in our overflow tracker
if (!madeContinuation &&
!(NS_FRAME_IS_OVERFLOW_CONTAINER & nextFrame->GetStateBits())) {
// It already exists, but as a normal next-in-flow, so we need
// to dig it out of the child lists.
nsContainerFrame* parent = static_cast<nsContainerFrame*>
(nextFrame->GetParent());
rv = parent->StealFrame(aState.mPresContext, nextFrame);
NS_ENSURE_SUCCESS(rv, rv);
}
else if (madeContinuation) {
mFrames.RemoveFrame(nextFrame);
}
// Put it in our overflow list
aState.mOverflowTracker->Insert(nextFrame, frameReflowStatus);
NS_MergeReflowStatusInto(&aState.mReflowStatus, frameReflowStatus);
#ifdef NOISY_VERTICAL_MARGINS
ListTag(stdout);
printf(": reflow complete but overflow incomplete for ");
nsFrame::ListTag(stdout, frame);
printf(" prevBottomMargin=%d collapsedBottomMargin=%d\n",
aState.mPrevBottomMargin, collapsedBottomMargin.get());
#endif
aState.mPrevBottomMargin = collapsedBottomMargin;
}
}
else { // frame is fully complete
#ifdef NOISY_VERTICAL_MARGINS
ListTag(stdout);
printf(": reflow complete for ");
nsFrame::ListTag(stdout, frame);
printf(" prevBottomMargin=%d collapsedBottomMargin=%d\n",
aState.mPrevBottomMargin, collapsedBottomMargin.get());
#endif
aState.mPrevBottomMargin = collapsedBottomMargin;
}
#ifdef NOISY_VERTICAL_MARGINS
ListTag(stdout);
printf(": frame=");
nsFrame::ListTag(stdout, frame);
printf(" carriedOutBottomMargin=%d collapsedBottomMargin=%d => %d\n",
brc.GetCarriedOutBottomMargin(), collapsedBottomMargin.get(),
aState.mPrevBottomMargin);
#endif
}
else {
// None of the block fits. Determine the correct reflow status.
if (aLine == mLines.front() && !GetPrevInFlow()) {
// If it's our very first line then we need to be pushed to
// our parents next-in-flow. Therefore, return break-before
// status for our reflow status.
aState.mReflowStatus = NS_INLINE_LINE_BREAK_BEFORE();
}
else {
// Push the line that didn't fit and any lines that follow it
// to our next-in-flow.
PushLines(aState, aLine.prev());
NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus);
}
}
}
break; // out of the reflow retry loop
}
// Now that we've got its final position all figured out, position any child
// views it may have. Note that the case when frame has a view got handled
// by FinishReflowChild, but that function didn't have the coordinates needed
// to correctly decide whether to reposition child views.
if (originalPosition != frame->GetPosition() && !frame->HasView()) {
nsContainerFrame::PositionChildViews(frame);
}
#ifdef DEBUG
VerifyLines(PR_TRUE);
#endif
return rv;
}
nsresult
nsBlockFrame::ReflowInlineFrames(nsBlockReflowState& aState,
line_iterator aLine,
PRBool* aKeepReflowGoing)
{
nsresult rv = NS_OK;
*aKeepReflowGoing = PR_TRUE;
aLine->SetLineIsImpactedByFloat(PR_FALSE);
// Setup initial coordinate system for reflowing the inline frames
// into. Apply a previous block frame's bottom margin first.
if (ShouldApplyTopMargin(aState, aLine)) {
aState.mY += aState.mPrevBottomMargin.get();
}
nsFlowAreaRect floatAvailableSpace = aState.GetFloatAvailableSpace();
#ifdef DEBUG
PRInt32 spins = 0;
#endif
LineReflowStatus lineReflowStatus;
do {
nscoord availableSpaceHeight = 0;
do {
PRBool allowPullUp = PR_TRUE;
nsIContent* forceBreakInContent = nsnull;
PRInt32 forceBreakOffset = -1;
gfxBreakPriority forceBreakPriority = eNoBreak;
do {
nsFloatManager::SavedState floatManagerState;
aState.mReflowState.mFloatManager->PushState(&floatManagerState);
// Once upon a time we allocated the first 30 nsLineLayout objects
// on the stack, and then we switched to the heap. At that time
// these objects were large (1100 bytes on a 32 bit system).
// Then the nsLineLayout object was shrunk to 156 bytes by
// removing some internal buffers. Given that it is so much
// smaller, the complexity of 2 different ways of allocating
// no longer makes sense. Now we always allocate on the stack.
nsLineLayout lineLayout(aState.mPresContext,
aState.mReflowState.mFloatManager,
&aState.mReflowState, &aLine);
lineLayout.Init(&aState, aState.mMinLineHeight, aState.mLineNumber);
if (forceBreakInContent) {
lineLayout.ForceBreakAtPosition(forceBreakInContent, forceBreakOffset);
}
rv = DoReflowInlineFrames(aState, lineLayout, aLine,
floatAvailableSpace, availableSpaceHeight,
&floatManagerState, aKeepReflowGoing,
&lineReflowStatus, allowPullUp);
lineLayout.EndLineReflow();
if (NS_FAILED(rv)) {
return rv;
}
if (LINE_REFLOW_REDO_NO_PULL == lineReflowStatus ||
LINE_REFLOW_REDO_MORE_FLOATS == lineReflowStatus ||
LINE_REFLOW_REDO_NEXT_BAND == lineReflowStatus) {
if (lineLayout.NeedsBackup()) {
NS_ASSERTION(!forceBreakInContent, "Backing up twice; this should never be necessary");
// If there is no saved break position, then this will set
// set forceBreakInContent to null and we won't back up, which is
// correct.
forceBreakInContent = lineLayout.GetLastOptionalBreakPosition(&forceBreakOffset, &forceBreakPriority);
} else {
forceBreakInContent = nsnull;
}
// restore the float manager state
aState.mReflowState.mFloatManager->PopState(&floatManagerState);
// Clear out float lists
aState.mCurrentLineFloats.DeleteAll();
aState.mBelowCurrentLineFloats.DeleteAll();
}
#ifdef DEBUG
spins++;
if (1000 == spins) {
ListTag(stdout);
printf(": yikes! spinning on a line over 1000 times!\n");
NS_ABORT();
}
#endif
// Don't allow pullup on a subsequent LINE_REFLOW_REDO_NO_PULL pass
allowPullUp = PR_FALSE;
} while (LINE_REFLOW_REDO_NO_PULL == lineReflowStatus);
} while (LINE_REFLOW_REDO_MORE_FLOATS == lineReflowStatus);
} while (LINE_REFLOW_REDO_NEXT_BAND == lineReflowStatus);
return rv;
}
void
nsBlockFrame::PushTruncatedLine(nsBlockReflowState& aState,
line_iterator aLine,
PRBool& aKeepReflowGoing)
{
line_iterator prevLine = aLine;
--prevLine;
PushLines(aState, prevLine);
aKeepReflowGoing = PR_FALSE;
NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus);
}
#ifdef DEBUG
static const char* LineReflowStatusNames[] = {
"LINE_REFLOW_OK", "LINE_REFLOW_STOP", "LINE_REFLOW_REDO_NO_PULL",
"LINE_REFLOW_REDO_MORE_FLOATS",
"LINE_REFLOW_REDO_NEXT_BAND", "LINE_REFLOW_TRUNCATED"
};
#endif
nsresult
nsBlockFrame::DoReflowInlineFrames(nsBlockReflowState& aState,
nsLineLayout& aLineLayout,
line_iterator aLine,
nsFlowAreaRect& aFloatAvailableSpace,
nscoord& aAvailableSpaceHeight,
nsFloatManager::SavedState*
aFloatStateBeforeLine,
PRBool* aKeepReflowGoing,
LineReflowStatus* aLineReflowStatus,
PRBool aAllowPullUp)
{
// Forget all of the floats on the line
aLine->FreeFloats(aState.mFloatCacheFreeList);
aState.mFloatCombinedArea.SetRect(0, 0, 0, 0);
// We need to set this flag on the line if any of our reflow passes
// are impacted by floats.
if (aFloatAvailableSpace.mHasFloats)
aLine->SetLineIsImpactedByFloat(PR_TRUE);
#ifdef REALLY_NOISY_REFLOW
printf("nsBlockFrame::DoReflowInlineFrames %p impacted = %d\n",
this, aFloatAvailableSpace.mHasFloats);
#endif
nscoord x = aFloatAvailableSpace.mRect.x;
nscoord availWidth = aFloatAvailableSpace.mRect.width;
nscoord availHeight;
if (aState.GetFlag(BRS_UNCONSTRAINEDHEIGHT)) {
availHeight = NS_UNCONSTRAINEDSIZE;
}
else {
/* XXX get the height right! */
availHeight = aFloatAvailableSpace.mRect.height;
}
// Make sure to enable resize optimization before we call BeginLineReflow
// because it might get disabled there
aLine->EnableResizeReflowOptimization();
aLineLayout.BeginLineReflow(x, aState.mY,
availWidth, availHeight,
aFloatAvailableSpace.mHasFloats,
PR_FALSE /*XXX isTopOfPage*/);
aState.SetFlag(BRS_LINE_LAYOUT_EMPTY, PR_FALSE);
// XXX Unfortunately we need to know this before reflowing the first
// inline frame in the line. FIX ME.
if ((0 == aLineLayout.GetLineNumber()) &&
(NS_BLOCK_HAS_FIRST_LETTER_CHILD & mState) &&
(NS_BLOCK_HAS_FIRST_LETTER_STYLE & mState)) {
aLineLayout.SetFirstLetterStyleOK(PR_TRUE);
}
NS_ASSERTION(!((NS_BLOCK_HAS_FIRST_LETTER_CHILD & mState) &&
GetPrevContinuation()),
"first letter child bit should only be on first continuation");
// Reflow the frames that are already on the line first
nsresult rv = NS_OK;
LineReflowStatus lineReflowStatus = LINE_REFLOW_OK;
PRInt32 i;
nsIFrame* frame = aLine->mFirstChild;
if (aFloatAvailableSpace.mHasFloats) {
// There is a soft break opportunity at the start of the line, because
// we can always move this line down below float(s).
if (aLineLayout.NotifyOptionalBreakPosition(frame->GetContent(), 0, PR_TRUE, eNormalBreak)) {
lineReflowStatus = LINE_REFLOW_REDO_NEXT_BAND;
}
}
// need to repeatedly call GetChildCount here, because the child
// count can change during the loop!
for (i = 0; LINE_REFLOW_OK == lineReflowStatus && i < aLine->GetChildCount();
i++, frame = frame->GetNextSibling()) {
rv = ReflowInlineFrame(aState, aLineLayout, aLine, frame,
&lineReflowStatus);
NS_ENSURE_SUCCESS(rv, rv);
if (LINE_REFLOW_OK != lineReflowStatus) {
// It is possible that one or more of next lines are empty
// (because of DeleteNextInFlowChild). If so, delete them now
// in case we are finished.
++aLine;
while ((aLine != end_lines()) && (0 == aLine->GetChildCount())) {
// XXX Is this still necessary now that DeleteNextInFlowChild
// uses DoRemoveFrame?
nsLineBox *toremove = aLine;
aLine = mLines.erase(aLine);
NS_ASSERTION(nsnull == toremove->mFirstChild, "bad empty line");
aState.FreeLineBox(toremove);
}
--aLine;
NS_ASSERTION(lineReflowStatus != LINE_REFLOW_TRUNCATED,
"ReflowInlineFrame should never determine that a line "
"needs to go to the next page/column");
}
}
// Don't pull up new frames into lines with continuation placeholders
if (aAllowPullUp) {
// Pull frames and reflow them until we can't
while (LINE_REFLOW_OK == lineReflowStatus) {
frame = PullFrame(aState, aLine);
if (!frame) {
break;
}
while (LINE_REFLOW_OK == lineReflowStatus) {
PRInt32 oldCount = aLine->GetChildCount();
rv = ReflowInlineFrame(aState, aLineLayout, aLine, frame,
&lineReflowStatus);
NS_ENSURE_SUCCESS(rv, rv);
if (aLine->GetChildCount() != oldCount) {
// We just created a continuation for aFrame AND its going
// to end up on this line (e.g. :first-letter
// situation). Therefore we have to loop here before trying
// to pull another frame.
frame = frame->GetNextSibling();
}
else {
break;
}
}
}
}
aState.SetFlag(BRS_LINE_LAYOUT_EMPTY, aLineLayout.LineIsEmpty());
// We only need to backup if the line isn't going to be reflowed again anyway
PRBool needsBackup = aLineLayout.NeedsBackup() &&
(lineReflowStatus == LINE_REFLOW_STOP || lineReflowStatus == LINE_REFLOW_OK);
if (needsBackup && aLineLayout.HaveForcedBreakPosition()) {
NS_WARNING("We shouldn't be backing up more than once! "
"Someone must have set a break opportunity beyond the available width, "
"even though there were better break opportunities before it");
needsBackup = PR_FALSE;
}
if (needsBackup) {
// We need to try backing up to before a text run
PRInt32 offset;
gfxBreakPriority breakPriority;
nsIContent* breakContent = aLineLayout.GetLastOptionalBreakPosition(&offset, &breakPriority);
// XXX It's possible, in fact not unusual, for the break opportunity to already
// be the end of the line. We should detect that and optimize to not
// re-do the line.
if (breakContent) {
// We can back up!
lineReflowStatus = LINE_REFLOW_REDO_NO_PULL;
}
} else {
// In case we reflow this line again, remember that we don't
// need to force any breaking
aLineLayout.ClearOptionalBreakPosition();
}
if (LINE_REFLOW_REDO_NEXT_BAND == lineReflowStatus) {
// This happens only when we have a line that is impacted by
// floats and the first element in the line doesn't fit with
// the floats.
//
// What we do is to advance past the first float we find and
// then reflow the line all over again.
NS_ASSERTION(NS_UNCONSTRAINEDSIZE != aFloatAvailableSpace.mRect.height,
"unconstrained height on totally empty line");
// See the analogous code for blocks in nsBlockReflowState::ClearFloats.
if (aFloatAvailableSpace.mRect.height > 0) {
NS_ASSERTION(aFloatAvailableSpace.mHasFloats,
"redo line on totally empty line with non-empty band...");
// We should never hit this case if we've placed floats on the
// line; if we have, then the GetFloatAvailableSpace call is wrong
// and needs to happen after the caller pops the space manager
// state.
aState.mFloatManager->AssertStateMatches(aFloatStateBeforeLine);
aState.mY += aFloatAvailableSpace.mRect.height;
aFloatAvailableSpace = aState.GetFloatAvailableSpace();
} else {
NS_ASSERTION(NS_UNCONSTRAINEDSIZE != aState.mReflowState.availableHeight,
"We shouldn't be running out of height here");
if (NS_UNCONSTRAINEDSIZE == aState.mReflowState.availableHeight) {
// just move it down a bit to try to get out of this mess
aState.mY += 1;
// We should never hit this case if we've placed floats on the
// line; if we have, then the GetFloatAvailableSpace call is wrong
// and needs to happen after the caller pops the space manager
// state.
aState.mFloatManager->AssertStateMatches(aFloatStateBeforeLine);
aFloatAvailableSpace = aState.GetFloatAvailableSpace();
} else {
// There's nowhere to retry placing the line, so we want to push
// it to the next page/column where its contents can fit not
// next to a float.
lineReflowStatus = LINE_REFLOW_TRUNCATED;
// Push the line that didn't fit
PushTruncatedLine(aState, aLine, *aKeepReflowGoing);
}
}
// XXX: a small optimization can be done here when paginating:
// if the new Y coordinate is past the end of the block then
// push the line and return now instead of later on after we are
// past the float.
}
else if (LINE_REFLOW_TRUNCATED != lineReflowStatus &&
LINE_REFLOW_REDO_NO_PULL != lineReflowStatus) {
// If we are propagating out a break-before status then there is
// no point in placing the line.
if (!NS_INLINE_IS_BREAK_BEFORE(aState.mReflowStatus)) {
if (!PlaceLine(aState, aLineLayout, aLine, aFloatStateBeforeLine,
aFloatAvailableSpace.mRect, aAvailableSpaceHeight,
aKeepReflowGoing)) {
lineReflowStatus = LINE_REFLOW_REDO_MORE_FLOATS;
// PlaceLine already called GetAvailableSpaceForHeight for us.
}
}
}
#ifdef DEBUG
if (gNoisyReflow) {
printf("Line reflow status = %s\n", LineReflowStatusNames[lineReflowStatus]);
}
#endif
if (aLineLayout.GetDirtyNextLine()) {
// aLine may have been pushed to the overflow lines.
nsLineList* overflowLines = GetOverflowLines();
// We can't just compare iterators front() to aLine here, since they may be in
// different lists.
PRBool pushedToOverflowLines = overflowLines &&
overflowLines->front() == aLine.get();
if (pushedToOverflowLines) {
// aLine is stale, it's associated with the main line list but it should
// be associated with the overflow line list now
aLine = overflowLines->begin();
}
nsBlockInFlowLineIterator iter(this, aLine, pushedToOverflowLines);
if (iter.Next() && iter.GetLine()->IsInline()) {
iter.GetLine()->MarkDirty();
if (iter.GetContainer() != this) {
aState.mReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
}
}
}
*aLineReflowStatus = lineReflowStatus;
return rv;
}
/**
* Reflow an inline frame. The reflow status is mapped from the frames
* reflow status to the lines reflow status (not to our reflow status).
* The line reflow status is simple: PR_TRUE means keep placing frames
* on the line; PR_FALSE means don't (the line is done). If the line
* has some sort of breaking affect then aLine's break-type will be set
* to something other than NS_STYLE_CLEAR_NONE.
*/
nsresult
nsBlockFrame::ReflowInlineFrame(nsBlockReflowState& aState,
nsLineLayout& aLineLayout,
line_iterator aLine,
nsIFrame* aFrame,
LineReflowStatus* aLineReflowStatus)
{
NS_ENSURE_ARG_POINTER(aFrame);
*aLineReflowStatus = LINE_REFLOW_OK;
#ifdef NOISY_FIRST_LETTER
ListTag(stdout);
printf(": reflowing ");
nsFrame::ListTag(stdout, aFrame);
printf(" reflowingFirstLetter=%s\n",
aLineLayout.GetFirstLetterStyleOK() ? "on" : "off");
#endif
// Reflow the inline frame
nsReflowStatus frameReflowStatus;
PRBool pushedFrame;
nsresult rv = aLineLayout.ReflowFrame(aFrame, frameReflowStatus,
nsnull, pushedFrame);
NS_ENSURE_SUCCESS(rv, rv);
if (frameReflowStatus & NS_FRAME_REFLOW_NEXTINFLOW) {
aLineLayout.SetDirtyNextLine();
}
NS_ENSURE_SUCCESS(rv, rv);
#ifdef REALLY_NOISY_REFLOW_CHILD
nsFrame::ListTag(stdout, aFrame);
printf(": status=%x\n", frameReflowStatus);
#endif
#if defined(REFLOW_STATUS_COVERAGE)
RecordReflowStatus(PR_FALSE, frameReflowStatus);
#endif
// Send post-reflow notification
aState.mPrevChild = aFrame;
/* XXX
This is where we need to add logic to handle some odd behavior.
For one thing, we should usually place at least one thing next
to a left float, even when that float takes up all the width on a line.
see bug 22496
*/
// Process the child frames reflow status. There are 5 cases:
// complete, not-complete, break-before, break-after-complete,
// break-after-not-complete. There are two situations: we are a
// block or we are an inline. This makes a total of 10 cases
// (fortunately, there is some overlap).
aLine->SetBreakTypeAfter(NS_STYLE_CLEAR_NONE);
if (NS_INLINE_IS_BREAK(frameReflowStatus) ||
(NS_STYLE_CLEAR_NONE != aState.mFloatBreakType)) {
// Always abort the line reflow (because a line break is the
// minimal amount of break we do).
*aLineReflowStatus = LINE_REFLOW_STOP;
// XXX what should aLine's break-type be set to in all these cases?
PRUint8 breakType = NS_INLINE_GET_BREAK_TYPE(frameReflowStatus);
NS_ASSERTION((NS_STYLE_CLEAR_NONE != breakType) ||
(NS_STYLE_CLEAR_NONE != aState.mFloatBreakType), "bad break type");
NS_ASSERTION(NS_STYLE_CLEAR_PAGE != breakType, "no page breaks yet");
if (NS_INLINE_IS_BREAK_BEFORE(frameReflowStatus)) {
// Break-before cases.
if (aFrame == aLine->mFirstChild) {
// If we break before the first frame on the line then we must
// be trying to place content where there's no room (e.g. on a
// line with wide floats). Inform the caller to reflow the
// line after skipping past a float.
*aLineReflowStatus = LINE_REFLOW_REDO_NEXT_BAND;
}
else {
// It's not the first child on this line so go ahead and split
// the line. We will see the frame again on the next-line.
rv = SplitLine(aState, aLineLayout, aLine, aFrame, aLineReflowStatus);
NS_ENSURE_SUCCESS(rv, rv);
// If we're splitting the line because the frame didn't fit and it
// was pushed, then mark the line as having word wrapped. We need to
// know that if we're shrink wrapping our width
if (pushedFrame) {
aLine->SetLineWrapped(PR_TRUE);
}
}
}
else {
// If a float split and its prev-in-flow was followed by a <BR>, then combine
// the <BR>'s break type with the inline's break type (the inline will be the very
// next frame after the split float).
if (NS_STYLE_CLEAR_NONE != aState.mFloatBreakType) {
breakType = nsLayoutUtils::CombineBreakType(breakType,
aState.mFloatBreakType);
aState.mFloatBreakType = NS_STYLE_CLEAR_NONE;
}
// Break-after cases
if (breakType == NS_STYLE_CLEAR_LINE) {
if (!aLineLayout.GetLineEndsInBR()) {
breakType = NS_STYLE_CLEAR_NONE;
}
}
aLine->SetBreakTypeAfter(breakType);
if (NS_FRAME_IS_COMPLETE(frameReflowStatus)) {
// Split line, but after the frame just reflowed
rv = SplitLine(aState, aLineLayout, aLine, aFrame->GetNextSibling(), aLineReflowStatus);
NS_ENSURE_SUCCESS(rv, rv);
if (NS_INLINE_IS_BREAK_AFTER(frameReflowStatus) &&
!aLineLayout.GetLineEndsInBR()) {
aLineLayout.SetDirtyNextLine();
}
}
}
}
if (!NS_FRAME_IS_FULLY_COMPLETE(frameReflowStatus)) {
// Create a continuation for the incomplete frame. Note that the
// frame may already have a continuation.
nsIAtom* frameType = aFrame->GetType();
PRBool madeContinuation;
rv = CreateContinuationFor(aState, aLine, aFrame, madeContinuation);
NS_ENSURE_SUCCESS(rv, rv);
// Remember that the line has wrapped
if (!aLineLayout.GetLineEndsInBR()) {
aLine->SetLineWrapped(PR_TRUE);
}
// If we just ended a first-letter frame or reflowed a placeholder then
// don't split the line and don't stop the line reflow...
// But if we are going to stop anyways we'd better split the line.
if ((!(frameReflowStatus & NS_INLINE_BREAK_FIRST_LETTER_COMPLETE) &&
nsGkAtoms::placeholderFrame != frameType) ||
*aLineReflowStatus == LINE_REFLOW_STOP) {
// Split line after the current frame
*aLineReflowStatus = LINE_REFLOW_STOP;
rv = SplitLine(aState, aLineLayout, aLine, aFrame->GetNextSibling(), aLineReflowStatus);
NS_ENSURE_SUCCESS(rv, rv);
}
}
return NS_OK;
}
nsresult
nsBlockFrame::CreateContinuationFor(nsBlockReflowState& aState,
nsLineBox* aLine,
nsIFrame* aFrame,
PRBool& aMadeNewFrame)
{
aMadeNewFrame = PR_FALSE;
if (!aFrame->GetNextInFlow()) {
nsIFrame* newFrame;
nsresult rv = aState.mPresContext->PresShell()->FrameConstructor()->
CreateContinuingFrame(aState.mPresContext, aFrame, this, &newFrame);
if (NS_FAILED(rv)) {
return rv;
}
mFrames.InsertFrame(nsnull, aFrame, newFrame);
if (aLine) {
aLine->SetChildCount(aLine->GetChildCount() + 1);
}
aMadeNewFrame = PR_TRUE;
}
#ifdef DEBUG
VerifyLines(PR_FALSE);
#endif
return NS_OK;
}
nsresult
nsBlockFrame::SplitFloat(nsBlockReflowState& aState,
nsIFrame* aFloat,
nsReflowStatus aFloatStatus)
{
nsIFrame* nextInFlow = aFloat->GetNextInFlow();
if (nextInFlow) {
nsContainerFrame *oldParent =
static_cast<nsContainerFrame*>(nextInFlow->GetParent());
nsresult rv = oldParent->StealFrame(aState.mPresContext, nextInFlow);
NS_ASSERTION(NS_SUCCEEDED(rv), "StealFrame failed");
if (oldParent != this) {
ReparentFrame(nextInFlow, oldParent, this);
}
} else {
nsresult rv = aState.mPresContext->PresShell()->FrameConstructor()->
CreateContinuingFrame(aState.mPresContext, aFloat, this, &nextInFlow);
NS_ENSURE_SUCCESS(rv, rv);
}
if (NS_FRAME_OVERFLOW_IS_INCOMPLETE(aFloatStatus))
aFloat->GetNextInFlow()->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
// The containing block is now overflow-incomplete.
NS_FRAME_SET_OVERFLOW_INCOMPLETE(aState.mReflowStatus);
if (aFloat->GetStyleDisplay()->mFloats == NS_STYLE_FLOAT_LEFT) {
aState.mFloatManager->SetSplitLeftFloatAcrossBreak();
} else {
NS_ABORT_IF_FALSE(aFloat->GetStyleDisplay()->mFloats ==
NS_STYLE_FLOAT_RIGHT, "unexpected float side");
aState.mFloatManager->SetSplitRightFloatAcrossBreak();
}
aState.AppendPushedFloat(nextInFlow);
return NS_OK;
}
static nsFloatCache*
GetLastFloat(nsLineBox* aLine)
{
nsFloatCache* fc = aLine->GetFirstFloat();
while (fc && fc->Next()) {
fc = fc->Next();
}
return fc;
}
static PRBool
CheckPlaceholderInLine(nsIFrame* aBlock, nsLineBox* aLine, nsFloatCache* aFC)
{
if (!aFC)
return PR_TRUE;
NS_ASSERTION(!aFC->mFloat->GetPrevContinuation(),
"float in a line should never be a continuation");
NS_ASSERTION(!(aFC->mFloat->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT),
"float in a line should never be a pushed float");
nsIFrame* ph = aBlock->PresContext()->FrameManager()->
GetPlaceholderFrameFor(aFC->mFloat->GetFirstInFlow());
for (nsIFrame* f = ph; f; f = f->GetParent()) {
if (f->GetParent() == aBlock)
return aLine->Contains(f);
}
NS_ASSERTION(PR_FALSE, "aBlock is not an ancestor of aFrame!");
return PR_TRUE;
}
nsresult
nsBlockFrame::SplitLine(nsBlockReflowState& aState,
nsLineLayout& aLineLayout,
line_iterator aLine,
nsIFrame* aFrame,
LineReflowStatus* aLineReflowStatus)
{
NS_ABORT_IF_FALSE(aLine->IsInline(), "illegal SplitLine on block line");
PRInt32 pushCount = aLine->GetChildCount() - aLineLayout.GetCurrentSpanCount();
NS_ABORT_IF_FALSE(pushCount >= 0, "bad push count");
#ifdef DEBUG
if (gNoisyReflow) {
nsFrame::IndentBy(stdout, gNoiseIndent);
printf("split line: from line=%p pushCount=%d aFrame=",
static_cast<void*>(aLine.get()), pushCount);
if (aFrame) {
nsFrame::ListTag(stdout, aFrame);
}
else {
printf("(null)");
}
printf("\n");
if (gReallyNoisyReflow) {
aLine->List(stdout, gNoiseIndent+1);
}
}
#endif
if (0 != pushCount) {
NS_ABORT_IF_FALSE(aLine->GetChildCount() > pushCount, "bad push");
NS_ABORT_IF_FALSE(nsnull != aFrame, "whoops");
#ifdef DEBUG
{
nsIFrame *f = aFrame;
PRInt32 count = pushCount;
while (f && count > 0) {
f = f->GetNextSibling();
--count;
}
NS_ASSERTION(count == 0, "Not enough frames to push");
}
#endif
// Put frames being split out into their own line
nsLineBox* newLine = aState.NewLineBox(aFrame, pushCount, PR_FALSE);
if (!newLine) {
return NS_ERROR_OUT_OF_MEMORY;
}
mLines.after_insert(aLine, newLine);
aLine->SetChildCount(aLine->GetChildCount() - pushCount);
#ifdef DEBUG
if (gReallyNoisyReflow) {
newLine->List(stdout, gNoiseIndent+1);
}
#endif
// Let line layout know that some frames are no longer part of its
// state.
aLineLayout.SplitLineTo(aLine->GetChildCount());
// If floats have been placed whose placeholders have been pushed to the new
// line, we need to reflow the old line again. We don't want to look at the
// frames in the new line, because as a large paragraph is laid out the
// we'd get O(N^2) performance. So instead we just check that the last
// float and the last below-current-line float are still in aLine.
if (!CheckPlaceholderInLine(this, aLine, GetLastFloat(aLine)) ||
!CheckPlaceholderInLine(this, aLine, aState.mBelowCurrentLineFloats.Tail())) {
*aLineReflowStatus = LINE_REFLOW_REDO_NO_PULL;
}
#ifdef DEBUG
VerifyLines(PR_TRUE);
#endif
}
return NS_OK;
}
PRBool
nsBlockFrame::ShouldJustifyLine(nsBlockReflowState& aState,
line_iterator aLine)
{
while (++aLine != end_lines()) {
// There is another line
if (0 != aLine->GetChildCount()) {
// If the next line is a block line then we must not justify
// this line because it means that this line is the last in a
// group of inline lines.
return !aLine->IsBlock();
}
// The next line is empty, try the next one
}
// XXX Not sure about this part
// Try our next-in-flows lines to answer the question
nsBlockFrame* nextInFlow = (nsBlockFrame*) GetNextInFlow();
while (nsnull != nextInFlow) {
for (line_iterator line = nextInFlow->begin_lines(),
line_end = nextInFlow->end_lines();
line != line_end;
++line)
{
if (0 != line->GetChildCount())
return !line->IsBlock();
}
nextInFlow = (nsBlockFrame*) nextInFlow->GetNextInFlow();
}
// This is the last line - so don't allow justification
return PR_FALSE;
}
PRBool
nsBlockFrame::PlaceLine(nsBlockReflowState& aState,
nsLineLayout& aLineLayout,
line_iterator aLine,
nsFloatManager::SavedState *aFloatStateBeforeLine,
nsRect& aFloatAvailableSpace,
nscoord& aAvailableSpaceHeight,
PRBool* aKeepReflowGoing)
{
// Trim extra white-space from the line before placing the frames
aLineLayout.TrimTrailingWhiteSpace();
// Vertically align the frames on this line.
//
// According to the CSS2 spec, section 12.6.1, the "marker" box
// participates in the height calculation of the list-item box's
// first line box.
//
// There are exactly two places a bullet can be placed: near the
// first or second line. It's only placed on the second line in a
// rare case: when the first line is empty.
PRBool addedBullet = PR_FALSE;
if (mBullet && HaveOutsideBullet() &&
((aLine == mLines.front() &&
(!aLineLayout.IsZeroHeight() || (aLine == mLines.back()))) ||
(mLines.front() != mLines.back() &&
0 == mLines.front()->mBounds.height &&
aLine == mLines.begin().next()))) {
nsHTMLReflowMetrics metrics;
ReflowBullet(aState, metrics, aState.mY);
NS_ASSERTION(!BulletIsEmpty() || metrics.height == 0,
"empty bullet took up space");
aLineLayout.AddBulletFrame(mBullet, metrics);
addedBullet = PR_TRUE;
}
aLineLayout.VerticalAlignLine();
// We want to compare to the available space that we would have had in
// the line's height *before* we placed any floats in the line itself.
// Floats that are in the line are handled during line reflow (and may
// result in floats being pushed to below the line or (I HOPE???) in a
// reflow with a forced break position).
nsRect oldFloatAvailableSpace(aFloatAvailableSpace);
// As we redo for floats, we can't reduce the amount of height we're
// checking.
aAvailableSpaceHeight = NS_MAX(aAvailableSpaceHeight, aLine->mBounds.height);
aFloatAvailableSpace =
aState.GetFloatAvailableSpaceForHeight(aLine->mBounds.y,
aAvailableSpaceHeight,
aFloatStateBeforeLine).mRect;
NS_ASSERTION(aFloatAvailableSpace.y == oldFloatAvailableSpace.y, "yikes");
// Restore the height to the position of the next band.
aFloatAvailableSpace.height = oldFloatAvailableSpace.height;
// If the available space between the floats is smaller now that we
// know the height, return false (and cause another pass with
// LINE_REFLOW_REDO_MORE_FLOATS).
if (AvailableSpaceShrunk(oldFloatAvailableSpace, aFloatAvailableSpace)) {
return PR_FALSE;
}
#ifdef DEBUG
{
static nscoord lastHeight = 0;
if (CRAZY_HEIGHT(aLine->mBounds.y)) {
lastHeight = aLine->mBounds.y;
if (abs(aLine->mBounds.y - lastHeight) > CRAZY_H/10) {
nsFrame::ListTag(stdout);
printf(": line=%p y=%d line.bounds.height=%d\n",
static_cast<void*>(aLine.get()),
aLine->mBounds.y, aLine->mBounds.height);
}
}
else {
lastHeight = 0;
}
}
#endif
// Only block frames horizontally align their children because
// inline frames "shrink-wrap" around their children (therefore
// there is no extra horizontal space).
const nsStyleText* styleText = GetStyleText();
PRBool allowJustify = NS_STYLE_TEXT_ALIGN_JUSTIFY == styleText->mTextAlign &&
!aLineLayout.GetLineEndsInBR() &&
ShouldJustifyLine(aState, aLine);
aLineLayout.HorizontalAlignFrames(aLine->mBounds, allowJustify);
// XXX: not only bidi: right alignment can be broken after
// RelativePositionFrames!!!
// XXXldb Is something here considering relatively positioned frames at
// other than their original positions?
#ifdef IBMBIDI
// XXXldb Why don't we do this earlier?
if (aState.mPresContext->BidiEnabled()) {
if (!aState.mPresContext->IsVisualMode() ||
GetStyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
nsBidiPresUtils* bidiUtils = aState.mPresContext->GetBidiUtils();
if (bidiUtils && bidiUtils->IsSuccessful() ) {
bidiUtils->ReorderFrames(aLine->mFirstChild, aLine->GetChildCount());
} // bidiUtils
} // not visual mode
} // bidi enabled
#endif // IBMBIDI
// From here on, pfd->mBounds rectangles are incorrect because bidi
// might have moved frames around!
nsRect combinedArea;
aLineLayout.RelativePositionFrames(combinedArea); // XXXldb This returned width as -15, 2001-06-12, Bugzilla
aLine->SetCombinedArea(combinedArea);
if (addedBullet) {
aLineLayout.RemoveBulletFrame(mBullet);
}
// Inline lines do not have margins themselves; however they are
// impacted by prior block margins. If this line ends up having some
// height then we zero out the previous bottom margin value that was
// already applied to the line's starting Y coordinate. Otherwise we
// leave it be so that the previous blocks bottom margin can be
// collapsed with a block that follows.
nscoord newY;
if (!aLine->CachedIsEmpty()) {
// This line has some height. Therefore the application of the
// previous-bottom-margin should stick.
aState.mPrevBottomMargin.Zero();
newY = aLine->mBounds.YMost();
}
else {
// Don't let the previous-bottom-margin value affect the newY
// coordinate (it was applied in ReflowInlineFrames speculatively)
// since the line is empty.
// We already called |ShouldApplyTopMargin|, and if we applied it
// then BRS_APPLYTOPMARGIN is set.
nscoord dy = aState.GetFlag(BRS_APPLYTOPMARGIN)
? -aState.mPrevBottomMargin.get() : 0;
newY = aState.mY + dy;
}
// See if the line fit. If it doesn't we need to push it. Our first
// line will always fit.
if (mLines.front() != aLine &&
newY > aState.mBottomEdge &&
aState.mBottomEdge != NS_UNCONSTRAINEDSIZE) {
// Push this line and all of its children and anything else that
// follows to our next-in-flow
NS_ASSERTION((aState.mCurrentLine == aLine), "oops");
PushLines(aState, aLine.prev());
// Stop reflow and whack the reflow status if reflow hasn't
// already been stopped.
if (*aKeepReflowGoing) {
NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus);
*aKeepReflowGoing = PR_FALSE;
}
return PR_TRUE;
}
aState.mY = newY;
// Add the already placed current-line floats to the line
aLine->AppendFloats(aState.mCurrentLineFloats);
// Any below current line floats to place?
if (aState.mBelowCurrentLineFloats.NotEmpty()) {
// Reflow the below-current-line floats, which places on the line's
// float list.
aState.PlaceBelowCurrentLineFloats(aState.mBelowCurrentLineFloats, aLine);
aLine->AppendFloats(aState.mBelowCurrentLineFloats);
}
// When a line has floats, factor them into the combined-area
// computations.
if (aLine->HasFloats()) {
// Combine the float combined area (stored in aState) and the
// value computed by the line layout code.
nsRect lineCombinedArea(aLine->GetCombinedArea());
#ifdef NOISY_COMBINED_AREA
ListTag(stdout);
printf(": lineCA=%d,%d,%d,%d floatCA=%d,%d,%d,%d\n",
lineCombinedArea.x, lineCombinedArea.y,
lineCombinedArea.width, lineCombinedArea.height,
aState.mFloatCombinedArea.x, aState.mFloatCombinedArea.y,
aState.mFloatCombinedArea.width,
aState.mFloatCombinedArea.height);
#endif
lineCombinedArea.UnionRect(aState.mFloatCombinedArea, lineCombinedArea);
aLine->SetCombinedArea(lineCombinedArea);
#ifdef NOISY_COMBINED_AREA
printf(" ==> final lineCA=%d,%d,%d,%d\n",
lineCombinedArea.x, lineCombinedArea.y,
lineCombinedArea.width, lineCombinedArea.height);
#endif
}
// Apply break-after clearing if necessary
// This must stay in sync with |ReflowDirtyLines|.
if (aLine->HasFloatBreakAfter()) {
aState.mY = aState.ClearFloats(aState.mY, aLine->GetBreakTypeAfter());
}
return PR_TRUE;
}
void
nsBlockFrame::PushLines(nsBlockReflowState& aState,
nsLineList::iterator aLineBefore)
{
nsLineList::iterator overBegin(aLineBefore.next());
// PushTruncatedPlaceholderLine sometimes pushes the first line. Ugh.
PRBool firstLine = overBegin == begin_lines();
if (overBegin != end_lines()) {
// Remove floats in the lines from mFloats
nsFrameList floats;
CollectFloats(overBegin->mFirstChild, floats, PR_FALSE, PR_TRUE);
if (floats.NotEmpty()) {
// Push the floats onto the front of the overflow out-of-flows list
nsAutoOOFFrameList oofs(this);
oofs.mList.InsertFrames(nsnull, nsnull, floats);
}
// overflow lines can already exist in some cases, in particular,
// when shrinkwrapping and we discover that the shrinkwap causes
// the height of some child block to grow which creates additional
// overflowing content. In such cases we must prepend the new
// overflow to the existing overflow.
nsLineList* overflowLines = RemoveOverflowLines();
if (!overflowLines) {
// XXXldb use presshell arena!
overflowLines = new nsLineList();
}
if (overflowLines) {
// First, remove the frames we're pushing from mFrames
nsIFrame* oldLastChild = mFrames.LastChild();
if (firstLine) {
mFrames.Clear();
} else {
mFrames.RemoveFramesAfter(aLineBefore->LastChild());
}
if (!overflowLines->empty()) {
// XXXbz If we switch overflow lines to nsFrameList, we should
// change this SetNextSibling call.
oldLastChild->SetNextSibling(overflowLines->front()->mFirstChild);
}
overflowLines->splice(overflowLines->begin(), mLines, overBegin,
end_lines());
NS_ASSERTION(!overflowLines->empty(), "should not be empty");
// this takes ownership but it won't delete it immediately so we
// can keep using it.
SetOverflowLines(overflowLines);
// Mark all the overflow lines dirty so that they get reflowed when
// they are pulled up by our next-in-flow.
// XXXldb Can this get called O(N) times making the whole thing O(N^2)?
for (line_iterator line = overflowLines->begin(),
line_end = overflowLines->end();
line != line_end;
++line)
{
line->MarkDirty();
line->MarkPreviousMarginDirty();
line->mBounds.SetRect(0, 0, 0, 0);
if (line->HasFloats()) {
line->FreeFloats(aState.mFloatCacheFreeList);
}
}
}
}
#ifdef DEBUG
VerifyOverflowSituation();
#endif
}
// The overflowLines property is stored as a pointer to a line list,
// which must be deleted. However, the following functions all maintain
// the invariant that the property is never set if the list is empty.
PRBool
nsBlockFrame::DrainOverflowLines(nsBlockReflowState& aState)
{
#ifdef DEBUG
VerifyOverflowSituation();
#endif
nsLineList* overflowLines = nsnull;
nsLineList* ourOverflowLines = nsnull;
// First grab the prev-in-flows overflow lines
nsBlockFrame* prevBlock = (nsBlockFrame*) GetPrevInFlow();
if (prevBlock) {
overflowLines = prevBlock->RemoveOverflowLines();
if (overflowLines) {
NS_ASSERTION(! overflowLines->empty(),
"overflow lines should never be set and empty");
// Make all the frames on the overflow line list mine
nsIFrame* frame = overflowLines->front()->mFirstChild;
while (nsnull != frame) {
ReparentFrame(frame, prevBlock, this);
// Get the next frame
frame = frame->GetNextSibling();
}
// make the overflow out-of-flow frames mine too
nsAutoOOFFrameList oofs(prevBlock);
if (oofs.mList.NotEmpty()) {
for (nsIFrame* f = oofs.mList.FirstChild(); f; f = f->GetNextSibling()) {
ReparentFrame(f, prevBlock, this);
}
mFloats.InsertFrames(nsnull, nsnull, oofs.mList);
}
}
// The lines on the overflow list have already been marked dirty and their
// previous margins marked dirty also.
}
// Don't need to reparent frames in our own overflow lines/oofs, because they're
// already ours. But we should put overflow floats back in mFloats.
ourOverflowLines = RemoveOverflowLines();
if (ourOverflowLines) {
nsAutoOOFFrameList oofs(this);
if (oofs.mList.NotEmpty()) {
// The overflow floats go after our regular floats
mFloats.AppendFrames(nsnull, oofs.mList);
}
}
if (!overflowLines && !ourOverflowLines) {
// nothing to do; always the case for non-constrained-height reflows
return PR_FALSE;
}
// Now join the line lists into mLines
if (overflowLines) {
if (!overflowLines->empty()) {
// Join the line lists
if (!mLines.empty()) {
// Remember to recompute the margins on the first line. This will
// also recompute the correct deltaY if necessary.
mLines.front()->MarkPreviousMarginDirty();
}
// Join the sibling lists together
nsIFrame* firstFrame = overflowLines->front()->mFirstChild;
nsIFrame* lastFrame = overflowLines->back()->LastChild();
nsFrameList framesToInsert(firstFrame, lastFrame);
mFrames.InsertFrames(nsnull, nsnull, framesToInsert);
// Place overflow lines at the front of our line list
mLines.splice(mLines.begin(), *overflowLines);
NS_ASSERTION(overflowLines->empty(), "splice should empty list");
}
delete overflowLines;
}
if (ourOverflowLines) {
if (!ourOverflowLines->empty()) {
nsIFrame* firstFrame = ourOverflowLines->front()->mFirstChild;
nsIFrame* lastFrame = ourOverflowLines->back()->LastChild();
nsFrameList framesToAppend(firstFrame, lastFrame);
mFrames.AppendFrames(nsnull, framesToAppend);
// append the overflow to mLines
mLines.splice(mLines.end(), *ourOverflowLines);
}
delete ourOverflowLines;
}
return PR_TRUE;
}
// This function assumes our prev-in-flow has completed reflow and its
// mFloats may contain frames at the end of its float list, marked with
// NS_FRAME_IS_PUSHED_FLOAT, that should be pulled to this block.
void
nsBlockFrame::DrainPushedFloats(nsBlockReflowState& aState)
{
// Take any continuations we need to take from our prev-in-flow.
nsBlockFrame* prevBlock = static_cast<nsBlockFrame*>(GetPrevInFlow());
if (!prevBlock)
return;
nsFrameList *list = prevBlock->RemovePushedFloats();
if (list) {
if (list->NotEmpty()) {
mFloats.InsertFrames(this, nsnull, *list);
}
delete list;
}
#ifdef DEBUG
for (nsIFrame* f = mFloats.FirstChild(); f ; f = f->GetNextSibling()) {
for (nsIFrame* c = f->GetFirstInFlow(); c ; c = c->GetNextInFlow()) {
NS_ASSERTION(c == f || c->GetParent() != this || !mFloats.ContainsFrame(c),
"Two floats with same parent in same floats list, expect weird errors.");
}
}
#endif
}
nsLineList*
nsBlockFrame::GetOverflowLines() const
{
if (!(GetStateBits() & NS_BLOCK_HAS_OVERFLOW_LINES)) {
return nsnull;
}
nsLineList* lines = static_cast<nsLineList*>
(Properties().Get(OverflowLinesProperty()));
NS_ASSERTION(lines && !lines->empty(),
"value should always be stored and non-empty when state set");
return lines;
}
nsLineList*
nsBlockFrame::RemoveOverflowLines()
{
if (!(GetStateBits() & NS_BLOCK_HAS_OVERFLOW_LINES)) {
return nsnull;
}
nsLineList* lines = static_cast<nsLineList*>
(Properties().Remove(OverflowLinesProperty()));
NS_ASSERTION(lines && !lines->empty(),
"value should always be stored and non-empty when state set");
RemoveStateBits(NS_BLOCK_HAS_OVERFLOW_LINES);
return lines;
}
// This takes ownership of aOverflowLines.
// XXX We should allocate overflowLines from presShell arena!
nsresult
nsBlockFrame::SetOverflowLines(nsLineList* aOverflowLines)
{
NS_ASSERTION(aOverflowLines, "null lines");
NS_ASSERTION(!aOverflowLines->empty(), "empty lines");
NS_ASSERTION(!(GetStateBits() & NS_BLOCK_HAS_OVERFLOW_LINES),
"Overwriting existing overflow lines");
FrameProperties props = Properties();
// Verify that we won't overwrite an existing overflow list
NS_ASSERTION(!props.Get(OverflowLinesProperty()), "existing overflow list");
props.Set(OverflowLinesProperty(), aOverflowLines);
AddStateBits(NS_BLOCK_HAS_OVERFLOW_LINES);
return NS_OK;
}
nsFrameList*
nsBlockFrame::GetOverflowOutOfFlows() const
{
if (!(GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS)) {
return nsnull;
}
nsFrameList* result =
GetPropTableFrames(PresContext(), OverflowOutOfFlowsProperty());
NS_ASSERTION(result, "value should always be non-empty when state set");
return result;
}
// This takes ownership of the frames
void
nsBlockFrame::SetOverflowOutOfFlows(const nsFrameList& aList,
nsFrameList* aPropValue)
{
NS_PRECONDITION(!!(GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS) ==
!!aPropValue, "state does not match value");
if (aList.IsEmpty()) {
if (!(GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS)) {
return;
}
nsFrameList* list =
RemovePropTableFrames(PresContext(),
OverflowOutOfFlowsProperty());
NS_ASSERTION(aPropValue == list, "prop value mismatch");
delete list;
RemoveStateBits(NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS);
}
else if (GetStateBits() & NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS) {
NS_ASSERTION(aPropValue == GetPropTableFrames(PresContext(),
OverflowOutOfFlowsProperty()),
"prop value mismatch");
*aPropValue = aList;
}
else {
SetPropTableFrames(PresContext(), new nsFrameList(aList),
OverflowOutOfFlowsProperty());
AddStateBits(NS_BLOCK_HAS_OVERFLOW_OUT_OF_FLOWS);
}
}
nsFrameList*
nsBlockFrame::GetPushedFloats() const
{
if (!(GetStateBits() & NS_BLOCK_HAS_PUSHED_FLOATS)) {
return nsnull;
}
nsFrameList* result =
static_cast<nsFrameList*>(Properties().Get(PushedFloatProperty()));
NS_ASSERTION(result, "value should always be non-empty when state set");
return result;
}
nsFrameList*
nsBlockFrame::EnsurePushedFloats()
{
nsFrameList *result = GetPushedFloats();
if (result)
return result;
result = new nsFrameList;
Properties().Set(PushedFloatProperty(), result);
AddStateBits(NS_BLOCK_HAS_PUSHED_FLOATS);
return result;
}
nsFrameList*
nsBlockFrame::RemovePushedFloats()
{
if (!(GetStateBits() & NS_BLOCK_HAS_PUSHED_FLOATS)) {
return nsnull;
}
nsFrameList *result =
static_cast<nsFrameList*>(Properties().Remove(PushedFloatProperty()));
RemoveStateBits(NS_BLOCK_HAS_PUSHED_FLOATS);
NS_ASSERTION(result, "value should always be non-empty when state set");
return result;
}
//////////////////////////////////////////////////////////////////////
// Frame list manipulation routines
NS_IMETHODIMP
nsBlockFrame::AppendFrames(nsIAtom* aListName,
nsFrameList& aFrameList)
{
if (aFrameList.IsEmpty()) {
return NS_OK;
}
if (aListName) {
if (nsGkAtoms::absoluteList == aListName) {
return mAbsoluteContainer.AppendFrames(this, aListName, aFrameList);
}
else if (nsGkAtoms::floatList == aListName) {
mFloats.AppendFrames(nsnull, aFrameList);
return NS_OK;
}
else {
NS_ERROR("unexpected child list");
return NS_ERROR_INVALID_ARG;
}
}
// Find the proper last-child for where the append should go
nsIFrame* lastKid = mLines.empty() ? nsnull : mLines.back()->LastChild();
// Add frames after the last child
#ifdef NOISY_REFLOW_REASON
ListTag(stdout);
printf(": append ");
nsFrame::ListTag(stdout, aFrameList);
if (lastKid) {
printf(" after ");
nsFrame::ListTag(stdout, lastKid);
}
printf("\n");
#endif
nsresult rv = AddFrames(aFrameList, lastKid);
if (NS_FAILED(rv)) {
return rv;
}
aFrameList.Clear();
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN); // XXX sufficient?
return NS_OK;
}
NS_IMETHODIMP
nsBlockFrame::InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == this,
"inserting after sibling frame with different parent");
if (aListName) {
if (nsGkAtoms::absoluteList == aListName) {
return mAbsoluteContainer.InsertFrames(this, aListName, aPrevFrame,
aFrameList);
}
else if (nsGkAtoms::floatList == aListName) {
mFloats.InsertFrames(this, aPrevFrame, aFrameList);
return NS_OK;
}
#ifdef IBMBIDI
else if (nsGkAtoms::nextBidi == aListName) {}
#endif // IBMBIDI
else {
NS_ERROR("unexpected child list");
return NS_ERROR_INVALID_ARG;
}
}
#ifdef NOISY_REFLOW_REASON
ListTag(stdout);
printf(": insert ");
nsFrame::ListTag(stdout, aFrameList);
if (aPrevFrame) {
printf(" after ");
nsFrame::ListTag(stdout, aPrevFrame);
}
printf("\n");
#endif
nsresult rv = AddFrames(aFrameList, aPrevFrame);
if (NS_FAILED(rv)) {
return rv;
}
#ifdef IBMBIDI
if (aListName != nsGkAtoms::nextBidi)
#endif // IBMBIDI
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN); // XXX sufficient?
return NS_OK;
}
static PRBool
ShouldPutNextSiblingOnNewLine(nsIFrame* aLastFrame)
{
nsIAtom* type = aLastFrame->GetType();
if (type == nsGkAtoms::brFrame)
return PR_TRUE;
if (type == nsGkAtoms::textFrame)
return aLastFrame->HasTerminalNewline() &&
aLastFrame->GetStyleText()->NewlineIsSignificant();
return PR_FALSE;
}
nsresult
nsBlockFrame::AddFrames(nsFrameList& aFrameList, nsIFrame* aPrevSibling)
{
// Clear our line cursor, since our lines may change.
ClearLineCursor();
if (aFrameList.IsEmpty()) {
return NS_OK;
}
// If we're inserting at the beginning of our list and we have an
// inside bullet, insert after that bullet.
if (!aPrevSibling && mBullet && !HaveOutsideBullet()) {
NS_ASSERTION(!aFrameList.ContainsFrame(mBullet),
"Trying to make mBullet prev sibling to itself");
aPrevSibling = mBullet;
}
nsIPresShell *presShell = PresContext()->PresShell();
// Attempt to find the line that contains the previous sibling
nsLineList::iterator prevSibLine = end_lines();
PRInt32 prevSiblingIndex = -1;
if (aPrevSibling) {
// XXX_perf This is technically O(N^2) in some cases, but by using
// RFind instead of Find, we make it O(N) in the most common case,
// which is appending content.
// Find the line that contains the previous sibling
if (! nsLineBox::RFindLineContaining(aPrevSibling,
begin_lines(), prevSibLine,
mFrames.LastChild(),
&prevSiblingIndex)) {
// Note: defensive code! RFindLineContaining must not return
// false in this case, so if it does...
NS_NOTREACHED("prev sibling not in line list");
aPrevSibling = nsnull;
prevSibLine = end_lines();
}
}
// Find the frame following aPrevSibling so that we can join up the
// two lists of frames.
if (aPrevSibling) {
// Split line containing aPrevSibling in two if the insertion
// point is somewhere in the middle of the line.
PRInt32 rem = prevSibLine->GetChildCount() - prevSiblingIndex - 1;
if (rem) {
// Split the line in two where the frame(s) are being inserted.
nsLineBox* line = NS_NewLineBox(presShell, aPrevSibling->GetNextSibling(), rem, PR_FALSE);
if (!line) {
return NS_ERROR_OUT_OF_MEMORY;
}
mLines.after_insert(prevSibLine, line);
prevSibLine->SetChildCount(prevSibLine->GetChildCount() - rem);
// Mark prevSibLine dirty and as needing textrun invalidation, since
// we may be breaking up text in the line. Its previous line may also
// need to be invalidated because it may be able to pull some text up.
MarkLineDirty(prevSibLine);
// The new line will also need its textruns recomputed because of the
// frame changes.
line->MarkDirty();
line->SetInvalidateTextRuns(PR_TRUE);
}
}
else if (! mLines.empty()) {
mLines.front()->MarkDirty();
mLines.front()->SetInvalidateTextRuns(PR_TRUE);
}
const nsFrameList::Slice& newFrames =
mFrames.InsertFrames(nsnull, aPrevSibling, aFrameList);
// Walk through the new frames being added and update the line data
// structures to fit.
for (nsFrameList::Enumerator e(newFrames); !e.AtEnd(); e.Next()) {
nsIFrame* newFrame = e.get();
NS_ASSERTION(!aPrevSibling || aPrevSibling->GetNextSibling() == newFrame,
"Unexpected aPrevSibling");
NS_ASSERTION(newFrame->GetType() != nsGkAtoms::placeholderFrame ||
(!newFrame->GetStyleDisplay()->IsAbsolutelyPositioned() &&
!newFrame->GetStyleDisplay()->IsFloating()),
"Placeholders should not float or be positioned");
PRBool isBlock = newFrame->GetStyleDisplay()->IsBlockOutside();
// If the frame is a block frame, or if there is no previous line or if the
// previous line is a block line we need to make a new line. We also make
// a new line, as an optimization, in the two cases we know we'll need it:
// if the previous line ended with a <br>, or if it has significant whitespace
// and ended in a newline.
if (isBlock || prevSibLine == end_lines() || prevSibLine->IsBlock() ||
(aPrevSibling && ShouldPutNextSiblingOnNewLine(aPrevSibling))) {
// Create a new line for the frame and add its line to the line
// list.
nsLineBox* line = NS_NewLineBox(presShell, newFrame, 1, isBlock);
if (!line) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (prevSibLine != end_lines()) {
// Append new line after prevSibLine
mLines.after_insert(prevSibLine, line);
++prevSibLine;
}
else {
// New line is going before the other lines
mLines.push_front(line);
prevSibLine = begin_lines();
}
}
else {
prevSibLine->SetChildCount(prevSibLine->GetChildCount() + 1);
// We're adding inline content to prevSibLine, so we need to mark it
// dirty, ensure its textruns are recomputed, and possibly do the same
// to its previous line since that line may be able to pull content up.
MarkLineDirty(prevSibLine);
}
aPrevSibling = newFrame;
}
#ifdef DEBUG
VerifyLines(PR_TRUE);
#endif
return NS_OK;
}
nsBlockFrame::line_iterator
nsBlockFrame::RemoveFloat(nsIFrame* aFloat) {
// Find which line contains the float, so we can update
// the float cache.
line_iterator line = begin_lines(), line_end = end_lines();
for ( ; line != line_end; ++line) {
if (line->IsInline() && line->RemoveFloat(aFloat)) {
break;
}
}
// Try to destroy if it's in mFloats.
if (mFloats.DestroyFrameIfPresent(aFloat)) {
return line;
}
// Try our overflow list
{
nsAutoOOFFrameList oofs(this);
if (oofs.mList.DestroyFrameIfPresent(aFloat)) {
return line_end;
}
}
NS_ERROR("Destroying float without removing from a child list.");
return line_end;
}
static void MarkSameFloatManagerLinesDirty(nsBlockFrame* aBlock)
{
nsBlockFrame* blockWithFloatMgr = aBlock;
while (!(blockWithFloatMgr->GetStateBits() & NS_BLOCK_FLOAT_MGR)) {
nsBlockFrame* bf = nsLayoutUtils::GetAsBlock(blockWithFloatMgr->GetParent());
if (!bf) {
break;
}
blockWithFloatMgr = bf;
}
// Mark every line at and below the line where the float was
// dirty, and mark their lines dirty too. We could probably do
// something more efficient --- e.g., just dirty the lines that intersect
// the float vertically.
MarkAllDescendantLinesDirty(blockWithFloatMgr);
}
/**
* Returns PR_TRUE if aFrame is a block that has one or more float children.
*/
static PRBool BlockHasAnyFloats(nsIFrame* aFrame)
{
nsBlockFrame* block = nsLayoutUtils::GetAsBlock(aFrame);
if (!block)
return PR_FALSE;
if (block->GetFirstChild(nsGkAtoms::floatList))
return PR_TRUE;
nsLineList::iterator line = block->begin_lines();
nsLineList::iterator endLine = block->end_lines();
while (line != endLine) {
if (line->IsBlock() && BlockHasAnyFloats(line->mFirstChild))
return PR_TRUE;
++line;
}
return PR_FALSE;
}
NS_IMETHODIMP
nsBlockFrame::RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame)
{
nsresult rv = NS_OK;
#ifdef NOISY_REFLOW_REASON
ListTag(stdout);
printf(": remove ");
nsFrame::ListTag(stdout, aOldFrame);
printf("\n");
#endif
if (nsnull == aListName) {
PRBool hasFloats = BlockHasAnyFloats(aOldFrame);
rv = DoRemoveFrame(aOldFrame, REMOVE_FIXED_CONTINUATIONS);
if (hasFloats) {
MarkSameFloatManagerLinesDirty(this);
}
}
else if (nsGkAtoms::absoluteList == aListName) {
mAbsoluteContainer.RemoveFrame(this, aListName, aOldFrame);
return NS_OK;
}
else if (nsGkAtoms::floatList == aListName) {
// Make sure to mark affected lines dirty for the float frame
// we are removing; this way is a bit messy, but so is the rest of the code.
// See bug 390762.
NS_ASSERTION(!aOldFrame->GetPrevContinuation(),
"RemoveFrame should not be called on pushed floats.");
for (nsIFrame* f = aOldFrame;
f && !(f->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER);
f = f->GetNextContinuation()) {
MarkSameFloatManagerLinesDirty(static_cast<nsBlockFrame*>(f->GetParent()));
}
DoRemoveOutOfFlowFrame(aOldFrame);
}
#ifdef IBMBIDI
else if (nsGkAtoms::nextBidi == aListName) {
// Skip the call to |FrameNeedsReflow| below by returning now.
return DoRemoveFrame(aOldFrame, REMOVE_FIXED_CONTINUATIONS);
}
#endif // IBMBIDI
else {
NS_ERROR("unexpected child list");
rv = NS_ERROR_INVALID_ARG;
}
if (NS_SUCCEEDED(rv)) {
PresContext()->PresShell()->
FrameNeedsReflow(this, nsIPresShell::eTreeChange,
NS_FRAME_HAS_DIRTY_CHILDREN); // XXX sufficient?
}
return rv;
}
void
nsBlockFrame::DoRemoveOutOfFlowFrame(nsIFrame* aFrame)
{
// The containing block is always the parent of aFrame.
nsBlockFrame* block = (nsBlockFrame*)aFrame->GetParent();
// Remove aFrame from the appropriate list.
const nsStyleDisplay* display = aFrame->GetStyleDisplay();
if (display->IsAbsolutelyPositioned()) {
// This also deletes the next-in-flows
block->mAbsoluteContainer.RemoveFrame(block,
nsGkAtoms::absoluteList,
aFrame);
}
else {
// First remove aFrame's next-in-flows
nsIFrame* nif = aFrame->GetNextInFlow();
if (nif) {
static_cast<nsContainerFrame*>(nif->GetParent())
->DeleteNextInFlowChild(aFrame->PresContext(), nif, PR_FALSE);
}
// Now remove aFrame
// This also destroys the frame.
block->RemoveFloat(aFrame);
}
}
/**
* This helps us iterate over the list of all normal + overflow lines
*/
void
nsBlockFrame::TryAllLines(nsLineList::iterator* aIterator,
nsLineList::iterator* aStartIterator,
nsLineList::iterator* aEndIterator,
PRBool* aInOverflowLines) {
if (*aIterator == *aEndIterator) {
if (!*aInOverflowLines) {
*aInOverflowLines = PR_TRUE;
// Try the overflow lines
nsLineList* overflowLines = GetOverflowLines();
if (overflowLines) {
*aStartIterator = overflowLines->begin();
*aIterator = *aStartIterator;
*aEndIterator = overflowLines->end();
}
}
}
}
nsBlockInFlowLineIterator::nsBlockInFlowLineIterator(nsBlockFrame* aFrame,
line_iterator aLine, PRBool aInOverflow)
: mFrame(aFrame), mLine(aLine), mInOverflowLines(nsnull)
{
if (aInOverflow) {
mInOverflowLines = aFrame->GetOverflowLines();
NS_ASSERTION(mInOverflowLines, "How can we be in overflow if there isn't any?");
}
}
nsBlockInFlowLineIterator::nsBlockInFlowLineIterator(nsBlockFrame* aFrame,
PRBool* aFoundValidLine)
: mFrame(aFrame), mInOverflowLines(nsnull)
{
mLine = aFrame->begin_lines();
*aFoundValidLine = FindValidLine();
}
static nsIFrame*
FindChildContaining(nsBlockFrame* aFrame, nsIFrame* aFindFrame)
{
NS_ASSERTION(aFrame, "must have frame");
nsIFrame* child;
while (PR_TRUE) {
nsIFrame* block = aFrame;
do {
child = nsLayoutUtils::FindChildContainingDescendant(block, aFindFrame);
if (child)
break;
block = block->GetNextContinuation();
} while (block);
if (!child)
return nsnull;
if (!(child->GetStateBits() & NS_FRAME_OUT_OF_FLOW))
break;
aFindFrame = aFrame->PresContext()->FrameManager()->GetPlaceholderFrameFor(child);
}
return child;
}
nsBlockInFlowLineIterator::nsBlockInFlowLineIterator(nsBlockFrame* aFrame,
nsIFrame* aFindFrame, PRBool* aFoundValidLine)
: mFrame(aFrame), mInOverflowLines(nsnull)
{
mLine = aFrame->begin_lines();
*aFoundValidLine = PR_FALSE;
nsIFrame* child = FindChildContaining(aFrame, aFindFrame);
if (!child)
return;
if (!FindValidLine())
return;
do {
if (mLine->Contains(child)) {
*aFoundValidLine = PR_TRUE;
return;
}
} while (Next());
}
nsBlockFrame::line_iterator
nsBlockInFlowLineIterator::End()
{
return mInOverflowLines ? mInOverflowLines->end() : mFrame->end_lines();
}
PRBool
nsBlockInFlowLineIterator::IsLastLineInList()
{
line_iterator end = End();
return mLine != end && mLine.next() == end;
}
PRBool
nsBlockInFlowLineIterator::Next()
{
++mLine;
return FindValidLine();
}
PRBool
nsBlockInFlowLineIterator::Prev()
{
line_iterator begin = mInOverflowLines ? mInOverflowLines->begin() : mFrame->begin_lines();
if (mLine != begin) {
--mLine;
return PR_TRUE;
}
PRBool currentlyInOverflowLines = mInOverflowLines != nsnull;
while (PR_TRUE) {
if (currentlyInOverflowLines) {
mInOverflowLines = nsnull;
mLine = mFrame->end_lines();
if (mLine != mFrame->begin_lines()) {
--mLine;
return PR_TRUE;
}
} else {
mFrame = static_cast<nsBlockFrame*>(mFrame->GetPrevInFlow());
if (!mFrame)
return PR_FALSE;
mInOverflowLines = mFrame->GetOverflowLines();
if (mInOverflowLines) {
mLine = mInOverflowLines->end();
NS_ASSERTION(mLine != mInOverflowLines->begin(), "empty overflow line list?");
--mLine;
return PR_TRUE;
}
}
currentlyInOverflowLines = !currentlyInOverflowLines;
}
}
PRBool
nsBlockInFlowLineIterator::FindValidLine()
{
line_iterator end = mInOverflowLines ? mInOverflowLines->end() : mFrame->end_lines();
if (mLine != end)
return PR_TRUE;
PRBool currentlyInOverflowLines = mInOverflowLines != nsnull;
while (PR_TRUE) {
if (currentlyInOverflowLines) {
mFrame = static_cast<nsBlockFrame*>(mFrame->GetNextInFlow());
if (!mFrame)
return PR_FALSE;
mInOverflowLines = nsnull;
mLine = mFrame->begin_lines();
if (mLine != mFrame->end_lines())
return PR_TRUE;
} else {
mInOverflowLines = mFrame->GetOverflowLines();
if (mInOverflowLines) {
mLine = mInOverflowLines->begin();
NS_ASSERTION(mLine != mInOverflowLines->end(), "empty overflow line list?");
return PR_TRUE;
}
}
currentlyInOverflowLines = !currentlyInOverflowLines;
}
}
static nsresult RemoveBlockChild(nsIFrame* aFrame,
PRBool aRemoveOnlyFluidContinuations)
{
if (!aFrame)
return NS_OK;
nsBlockFrame* nextBlock = nsLayoutUtils::GetAsBlock(aFrame->GetParent());
NS_ASSERTION(nextBlock,
"Our child's continuation's parent is not a block?");
return nextBlock->DoRemoveFrame(aFrame,
(aRemoveOnlyFluidContinuations ? 0 : nsBlockFrame::REMOVE_FIXED_CONTINUATIONS));
}
// This function removes aDeletedFrame and all its continuations. It
// is optimized for deleting a whole series of frames. The easy
// implementation would invoke itself recursively on
// aDeletedFrame->GetNextContinuation, then locate the line containing
// aDeletedFrame and remove aDeletedFrame from that line. But here we
// start by locating aDeletedFrame and then scanning from that point
// on looking for continuations.
nsresult
nsBlockFrame::DoRemoveFrame(nsIFrame* aDeletedFrame, PRUint32 aFlags)
{
// Clear our line cursor, since our lines may change.
ClearLineCursor();
nsPresContext* presContext = PresContext();
if (aDeletedFrame->GetStateBits() &
(NS_FRAME_OUT_OF_FLOW | NS_FRAME_IS_OVERFLOW_CONTAINER)) {
if (!aDeletedFrame->GetPrevInFlow()) {
NS_ASSERTION(aDeletedFrame->GetStateBits() & NS_FRAME_OUT_OF_FLOW,
"Expected out-of-flow frame");
DoRemoveOutOfFlowFrame(aDeletedFrame);
}
else {
nsContainerFrame::DeleteNextInFlowChild(presContext, aDeletedFrame,
(aFlags & FRAMES_ARE_EMPTY) != 0);
}
return NS_OK;
}
nsIPresShell* presShell = presContext->PresShell();
// Find the line that contains deletedFrame
nsLineList::iterator line_start = mLines.begin(),
line_end = mLines.end();
nsLineList::iterator line = line_start;
PRBool searchingOverflowList = PR_FALSE;
// Make sure we look in the overflow lines even if the normal line
// list is empty
TryAllLines(&line, &line_start, &line_end, &searchingOverflowList);
while (line != line_end) {
if (line->Contains(aDeletedFrame)) {
break;
}
++line;
TryAllLines(&line, &line_start, &line_end, &searchingOverflowList);
}
if (line == line_end) {
NS_ERROR("can't find deleted frame in lines");
return NS_ERROR_FAILURE;
}
if (!(aFlags & FRAMES_ARE_EMPTY)) {
if (line != line_start) {
line.prev()->MarkDirty();
line.prev()->SetInvalidateTextRuns(PR_TRUE);
}
else if (searchingOverflowList && !mLines.empty()) {
mLines.back()->MarkDirty();
mLines.back()->SetInvalidateTextRuns(PR_TRUE);
}
}
while ((line != line_end) && (nsnull != aDeletedFrame)) {
NS_ASSERTION(this == aDeletedFrame->GetParent(), "messed up delete code");
NS_ASSERTION(line->Contains(aDeletedFrame), "frame not in line");
if (!(aFlags & FRAMES_ARE_EMPTY)) {
line->MarkDirty();
line->SetInvalidateTextRuns(PR_TRUE);
}
// If the frame being deleted is the last one on the line then
// optimize away the line->Contains(next-in-flow) call below.
PRBool isLastFrameOnLine = (1 == line->GetChildCount() ||
line->LastChild() == aDeletedFrame);
// Remove aDeletedFrame from the line
nsIFrame* nextFrame = aDeletedFrame->GetNextSibling();
if (line->mFirstChild == aDeletedFrame) {
// We should be setting this to null if aDeletedFrame
// is the only frame on the line. HOWEVER in that case
// we will be removing the line anyway, see below.
line->mFirstChild = nextFrame;
}
// Hmm, this won't do anything if we're removing a frame in the first
// overflow line... Hopefully doesn't matter
--line;
if (line != line_end && !line->IsBlock()) {
// Since we just removed a frame that follows some inline
// frames, we need to reflow the previous line.
line->MarkDirty();
}
++line;
// Take aDeletedFrame out of the sibling list. Note that
// prevSibling will only be nsnull when we are deleting the very
// first frame in the main or overflow list.
if (searchingOverflowList) {
nsIFrame* prevSibling = aDeletedFrame->GetPrevSibling();
if (prevSibling) {
// XXXbz If we switch overflow lines to nsFrameList, we should
// change this SetNextSibling call.
prevSibling->SetNextSibling(nextFrame);
}
aDeletedFrame->SetNextSibling(nsnull);
} else {
mFrames.RemoveFrame(aDeletedFrame);
}
// Update the child count of the line to be accurate
PRInt32 lineChildCount = line->GetChildCount();
lineChildCount--;
line->SetChildCount(lineChildCount);
// Destroy frame; capture its next continuation first in case we need
// to destroy that too.
nsIFrame* deletedNextContinuation = (aFlags & REMOVE_FIXED_CONTINUATIONS) ?
aDeletedFrame->GetNextContinuation() : aDeletedFrame->GetNextInFlow();
#ifdef NOISY_REMOVE_FRAME
printf("DoRemoveFrame: %s line=%p frame=",
searchingOverflowList?"overflow":"normal", line.get());
nsFrame::ListTag(stdout, aDeletedFrame);
printf(" prevSibling=%p deletedNextContinuation=%p\n",
aDeletedFrame->GetPrevSibling(), deletedNextContinuation);
#endif
// If next-in-flow is an overflow container, must remove it first.
if (deletedNextContinuation &&
deletedNextContinuation->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
static_cast<nsContainerFrame*>(deletedNextContinuation->GetParent())
->DeleteNextInFlowChild(presContext, deletedNextContinuation, PR_FALSE);
deletedNextContinuation = nsnull;
}
aDeletedFrame->Destroy();
aDeletedFrame = deletedNextContinuation;
PRBool haveAdvancedToNextLine = PR_FALSE;
// If line is empty, remove it now.
if (0 == lineChildCount) {
#ifdef NOISY_REMOVE_FRAME
printf("DoRemoveFrame: %s line=%p became empty so it will be removed\n",
searchingOverflowList?"overflow":"normal", line.get());
#endif
nsLineBox *cur = line;
if (!searchingOverflowList) {
line = mLines.erase(line);
// Invalidate the space taken up by the line.
// XXX We need to do this if we're removing a frame as a result of
// a call to RemoveFrame(), but we may not need to do this in all
// cases...
nsRect lineCombinedArea(cur->GetCombinedArea());
#ifdef NOISY_BLOCK_INVALIDATE
printf("%p invalidate 10 (%d, %d, %d, %d)\n",
this, lineCombinedArea.x, lineCombinedArea.y,
lineCombinedArea.width, lineCombinedArea.height);
#endif
Invalidate(lineCombinedArea);
} else {
nsLineList* lineList = RemoveOverflowLines();
line = lineList->erase(line);
if (!lineList->empty()) {
SetOverflowLines(lineList);
} else {
delete lineList;
// We just invalidated our iterators. Since we were in
// the overflow lines list, which is now empty, set them
// so we're at the end of the regular line list.
line_start = mLines.begin();
line_end = mLines.end();
line = line_end;
}
}
cur->Destroy(presShell);
// If we're removing a line, ReflowDirtyLines isn't going to
// know that it needs to slide lines unless something is marked
// dirty. So mark the previous margin of the next line dirty if
// there is one.
if (line != line_end) {
line->MarkPreviousMarginDirty();
}
haveAdvancedToNextLine = PR_TRUE;
} else {
// Make the line that just lost a frame dirty, and advance to
// the next line.
if (!deletedNextContinuation || isLastFrameOnLine ||
!line->Contains(deletedNextContinuation)) {
line->MarkDirty();
++line;
haveAdvancedToNextLine = PR_TRUE;
}
}
if (deletedNextContinuation) {
// See if we should keep looking in the current flow's line list.
if (deletedNextContinuation->GetParent() != this) {
// The deceased frames continuation is not a child of the
// current block. So break out of the loop so that we advance
// to the next parent.
//
// If we have a continuation in a different block then all bets are
// off regarding whether we are deleting frames without actual content,
// so don't propagate FRAMES_ARE_EMPTY any further.
aFlags &= ~FRAMES_ARE_EMPTY;
break;
}
// If we advanced to the next line then check if we should switch to the
// overflow line list.
if (haveAdvancedToNextLine) {
if (line != line_end && !searchingOverflowList &&
!line->Contains(deletedNextContinuation)) {
// We have advanced to the next *normal* line but the next-in-flow
// is not there - force a switch to the overflow line list.
line = line_end;
}
TryAllLines(&line, &line_start, &line_end, &searchingOverflowList);
#ifdef NOISY_REMOVE_FRAME
printf("DoRemoveFrame: now on %s line=%p\n",
searchingOverflowList?"overflow":"normal", line.get());
#endif
}
}
}
if (!(aFlags & FRAMES_ARE_EMPTY) && line.next() != line_end) {
line.next()->MarkDirty();
line.next()->SetInvalidateTextRuns(PR_TRUE);
}
#ifdef DEBUG
VerifyLines(PR_TRUE);
#endif
// Advance to next flow block if the frame has more continuations
return RemoveBlockChild(aDeletedFrame, !(aFlags & REMOVE_FIXED_CONTINUATIONS));
}
nsresult
nsBlockFrame::StealFrame(nsPresContext* aPresContext,
nsIFrame* aChild,
PRBool aForceNormal)
{
NS_PRECONDITION(aPresContext && aChild, "null pointer");
if ((aChild->GetStateBits() & NS_FRAME_OUT_OF_FLOW) &&
aChild->GetStyleDisplay()->IsFloating()) {
PRBool removed = mFloats.RemoveFrameIfPresent(aChild);
if (!removed) {
nsFrameList* list = GetPushedFloats();
if (list) {
removed = list->RemoveFrameIfPresent(aChild);
}
}
return removed ? NS_OK : NS_ERROR_UNEXPECTED;
}
if ((aChild->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)
&& !aForceNormal)
return nsContainerFrame::StealFrame(aPresContext, aChild);
// Find the line and the previous sibling that contains
// aChild; we also find the pointer to the line.
nsLineList::iterator line = mLines.begin(),
line_start = line,
line_end = mLines.end();
PRBool searchingOverflowList = PR_FALSE;
nsIFrame* prevSibling = nsnull;
// Make sure we look in the overflow lines even if the normal line
// list is empty
TryAllLines(&line, &line_start, &line_end, &searchingOverflowList);
while (line != line_end) {
nsIFrame* frame = line->mFirstChild;
PRInt32 n = line->GetChildCount();
while (--n >= 0) {
if (frame == aChild) {
// Disconnect from sibling list
if (frame == line->mFirstChild) {
line->mFirstChild = frame->GetNextSibling();
}
if (searchingOverflowList) {
// XXXbz If we switch overflow lines to nsFrameList, we should
// change this SetNextSibling call.
if (prevSibling)
prevSibling->SetNextSibling(frame->GetNextSibling());
frame->SetNextSibling(nsnull);
} else {
mFrames.RemoveFrame(frame);
}
// Register removal with the line boxes
PRInt32 count = line->GetChildCount();
line->SetChildCount(--count);
if (count > 0) {
line->MarkDirty();
}
else {
// Remove the line box
nsLineBox* lineBox = line;
if (searchingOverflowList) {
// Erase line, but avoid making the overflow line list empty
nsLineList* lineList = RemoveOverflowLines();
line = lineList->erase(line);
if (!lineList->empty()) {
nsresult rv = SetOverflowLines(lineList);
NS_ENSURE_SUCCESS(rv, rv);
} else {
delete lineList;
// We just invalidated our iterators. Since we were in
// the overflow lines list, which is now empty, set them
// so we're at the end of the regular line list.
line_start = mLines.begin();
line_end = mLines.end();
line = line_end;
}
}
else {
line = mLines.erase(line);
}
lineBox->Destroy(aPresContext->PresShell());
if (line != line_end) {
// Line disappeared, so tell next line it may have to change position
line->MarkPreviousMarginDirty();
}
}
// Ok, we're done
return NS_OK;
}
prevSibling = frame;
frame = frame->GetNextSibling();
}
++line;
TryAllLines(&line, &line_start, &line_end, &searchingOverflowList);
if (prevSibling && !prevSibling->GetNextSibling()) {
// We just switched to the overflow list. Null out prevSibling
prevSibling = nsnull;
}
}
return NS_ERROR_UNEXPECTED;
}
void
nsBlockFrame::DeleteNextInFlowChild(nsPresContext* aPresContext,
nsIFrame* aNextInFlow,
PRBool aDeletingEmptyFrames)
{
NS_PRECONDITION(aNextInFlow->GetPrevInFlow(), "bad next-in-flow");
if (aNextInFlow->GetStateBits() &
(NS_FRAME_OUT_OF_FLOW | NS_FRAME_IS_OVERFLOW_CONTAINER)) {
nsContainerFrame::DeleteNextInFlowChild(aPresContext,
aNextInFlow, aDeletingEmptyFrames);
}
else {
DoRemoveFrame(aNextInFlow,
aDeletingEmptyFrames ? FRAMES_ARE_EMPTY : 0);
}
}
////////////////////////////////////////////////////////////////////////
// Float support
nsRect
nsBlockFrame::AdjustFloatAvailableSpace(nsBlockReflowState& aState,
const nsRect& aFloatAvailableSpace,
nsIFrame* aFloatFrame)
{
// Compute the available width. By default, assume the width of the
// containing block.
nscoord availWidth;
const nsStyleDisplay* floatDisplay = aFloatFrame->GetStyleDisplay();
if (NS_STYLE_DISPLAY_TABLE != floatDisplay->mDisplay ||
eCompatibility_NavQuirks != aState.mPresContext->CompatibilityMode() ) {
availWidth = aState.mContentArea.width;
}
else {
// This quirk matches the one in nsBlockReflowState::FlowAndPlaceFloat
// give tables only the available space
// if they can shrink we may not be constrained to place
// them in the next line
availWidth = aFloatAvailableSpace.width;
}
nscoord availHeight = NS_UNCONSTRAINEDSIZE == aState.mContentArea.height
? NS_UNCONSTRAINEDSIZE
: NS_MAX(0, aState.mContentArea.YMost() - aState.mY);
#ifdef DISABLE_FLOAT_BREAKING_IN_COLUMNS
if (availHeight != NS_UNCONSTRAINEDSIZE &&
nsLayoutUtils::GetClosestFrameOfType(this, nsGkAtoms::columnSetFrame)) {
// Tell the float it has unrestricted height, so it won't break.
// If the float doesn't actually fit in the column it will fail to be
// placed, and either move to the top of the next column or just
// overflow.
availHeight = NS_UNCONSTRAINEDSIZE;
}
#endif
return nsRect(aState.mContentArea.x,
aState.mContentArea.y,
availWidth, availHeight);
}
nscoord
nsBlockFrame::ComputeFloatWidth(nsBlockReflowState& aState,
const nsRect& aFloatAvailableSpace,
nsIFrame* aFloat)
{
NS_PRECONDITION(aFloat->GetStateBits() & NS_FRAME_OUT_OF_FLOW,
"aFloat must be an out-of-flow frame");
// Reflow the float.
nsRect availSpace = AdjustFloatAvailableSpace(aState, aFloatAvailableSpace,
aFloat);
nsHTMLReflowState floatRS(aState.mPresContext, aState.mReflowState, aFloat,
nsSize(availSpace.width, availSpace.height));
return floatRS.ComputedWidth() + floatRS.mComputedBorderPadding.LeftRight() +
floatRS.mComputedMargin.LeftRight();
}
nsresult
nsBlockFrame::ReflowFloat(nsBlockReflowState& aState,
const nsRect& aAdjustedAvailableSpace,
nsIFrame* aFloat,
nsMargin& aFloatMargin,
PRBool aFloatPushedDown,
nsReflowStatus& aReflowStatus)
{
NS_PRECONDITION(aFloat->GetStateBits() & NS_FRAME_OUT_OF_FLOW,
"aFloat must be an out-of-flow frame");
// Reflow the float.
aReflowStatus = NS_FRAME_COMPLETE;
#ifdef NOISY_FLOAT
printf("Reflow Float %p in parent %p, availSpace(%d,%d,%d,%d)\n",
aFloat, this,
aFloatAvailableSpace.x, aFloatAvailableSpace.y,
aFloatAvailableSpace.width, aFloatAvailableSpace.height
);
#endif
nsHTMLReflowState floatRS(aState.mPresContext, aState.mReflowState, aFloat,
nsSize(aAdjustedAvailableSpace.width,
aAdjustedAvailableSpace.height));
// Normally the mIsTopOfPage state is copied from the parent reflow
// state. However, when reflowing a float, if we've placed other
// floats that force this float *down* or *narrower*, we should unset
// the mIsTopOfPage state.
// FIXME: This is somewhat redundant with the |isAdjacentWithTop|
// variable below, which has the exact same effect. Perhaps it should
// be merged into that, except that the test for narrowing here is not
// about adjacency with the top, so it seems misleading.
if (floatRS.mFlags.mIsTopOfPage &&
(aFloatPushedDown ||
aAdjustedAvailableSpace.width != aState.mContentArea.width)) {
floatRS.mFlags.mIsTopOfPage = PR_FALSE;
}
// Setup a block reflow context to reflow the float.
nsBlockReflowContext brc(aState.mPresContext, aState.mReflowState);
// Reflow the float
PRBool isAdjacentWithTop = aState.IsAdjacentWithTop();
nsIFrame* clearanceFrame = nsnull;
nsresult rv;
do {
nsCollapsingMargin margin;
PRBool mayNeedRetry = PR_FALSE;
floatRS.mDiscoveredClearance = nsnull;
// Only first in flow gets a top margin.
if (!aFloat->GetPrevInFlow()) {
nsBlockReflowContext::ComputeCollapsedTopMargin(floatRS, &margin,
clearanceFrame, &mayNeedRetry);
if (mayNeedRetry && !clearanceFrame) {
floatRS.mDiscoveredClearance = &clearanceFrame;
// We don't need to push the float manager state because the the block has its own
// float manager that will be destroyed and recreated
}
}
rv = brc.ReflowBlock(aAdjustedAvailableSpace, PR_TRUE, margin,
0, isAdjacentWithTop,
nsnull, floatRS,
aReflowStatus, aState);
} while (NS_SUCCEEDED(rv) && clearanceFrame);
// An incomplete reflow status means we should split the float
// if the height is constrained (bug 145305).
if (NS_FRAME_IS_NOT_COMPLETE(aReflowStatus) &&
(NS_UNCONSTRAINEDSIZE == aAdjustedAvailableSpace.height))
aReflowStatus = NS_FRAME_COMPLETE;
if (aReflowStatus & NS_FRAME_REFLOW_NEXTINFLOW) {
aState.mReflowStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
}
if (aFloat->GetType() == nsGkAtoms::letterFrame) {
// We never split floating first letters; an incomplete state for
// such frames simply means that there is more content to be
// reflowed on the line.
if (NS_FRAME_IS_NOT_COMPLETE(aReflowStatus))
aReflowStatus = NS_FRAME_COMPLETE;
}
if (NS_FAILED(rv)) {
return rv;
}
// Capture the margin information for the caller
aFloatMargin = floatRS.mComputedMargin; // float margins don't collapse
const nsHTMLReflowMetrics& metrics = brc.GetMetrics();
// Set the rect, make sure the view is properly sized and positioned,
// and tell the frame we're done reflowing it
// XXXldb This seems like the wrong place to be doing this -- shouldn't
// we be doing this in nsBlockReflowState::FlowAndPlaceFloat after
// we've positioned the float, and shouldn't we be doing the equivalent
// of |::PlaceFrameView| here?
aFloat->SetSize(nsSize(metrics.width, metrics.height));
if (aFloat->HasView()) {
nsContainerFrame::SyncFrameViewAfterReflow(aState.mPresContext, aFloat,
aFloat->GetView(),
&metrics.mOverflowArea,
NS_FRAME_NO_MOVE_VIEW);
}
// Pass floatRS so the frame hierarchy can be used (redoFloatRS has the same hierarchy)
aFloat->DidReflow(aState.mPresContext, &floatRS,
NS_FRAME_REFLOW_FINISHED);
#ifdef NOISY_FLOAT
printf("end ReflowFloat %p, sized to %d,%d\n",
aFloat, metrics.width, metrics.height);
#endif
return NS_OK;
}
PRUint8
nsBlockFrame::FindTrailingClear()
{
// find the break type of the last line
for (nsIFrame* b = this; b; b = b->GetPrevInFlow()) {
nsBlockFrame* block = static_cast<nsBlockFrame*>(b);
line_iterator endLine = block->end_lines();
if (endLine != block->begin_lines()) {
--endLine;
return endLine->GetBreakTypeAfter();
}
}
return NS_STYLE_CLEAR_NONE;
}
nsresult
nsBlockFrame::ReflowPushedFloats(nsBlockReflowState& aState,
nsRect& aBounds,
nsReflowStatus& aStatus)
{
nsresult rv = NS_OK;
for (nsIFrame* f = mFloats.FirstChild(), *next;
f && (f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT);
f = next) {
// save next sibling now, since reflowing could push the entire
// float, changing its siblings
next = f->GetNextSibling();
if (NS_SUBTREE_DIRTY(f) || aState.mReflowState.ShouldReflowAllKids()) {
// Cache old bounds
nsRect oldRect = f->GetRect();
nsRect oldOverflow = f->GetOverflowRect();
// Reflow
aState.FlowAndPlaceFloat(f);
// Invalidate if there was a position or size change
nsRect rect = f->GetRect();
if (rect != oldRect) {
nsRect dirtyRect = oldOverflow;
dirtyRect.MoveBy(oldRect.x, oldRect.y);
Invalidate(dirtyRect);
dirtyRect = f->GetOverflowRect();
dirtyRect.MoveBy(rect.x, rect.y);
Invalidate(dirtyRect);
}
}
else {
// Just reload the float region into the space manager
nsRect region = nsFloatManager::GetRegionFor(f);
aState.mFloatManager->AddFloat(f, region);
if (f->GetNextInFlow())
NS_MergeReflowStatusInto(&aStatus, NS_FRAME_OVERFLOW_INCOMPLETE);
}
ConsiderChildOverflow(aBounds, f);
}
// If there are continued floats, then we may need to continue BR clearance
if (0 != aState.ClearFloats(0, NS_STYLE_CLEAR_LEFT_AND_RIGHT)) {
aState.mFloatBreakType = static_cast<nsBlockFrame*>(GetPrevInFlow())
->FindTrailingClear();
}
return rv;
}
void
nsBlockFrame::RecoverFloats(nsFloatManager& aFloatManager)
{
// Recover our own floats
nsIFrame* stop = nsnull; // Stop before we reach pushed floats that
// belong to our next-in-flow
for (nsIFrame* f = mFloats.FirstChild(); f && f != stop; f = f->GetNextSibling()) {
nsRect region = nsFloatManager::GetRegionFor(f);
aFloatManager.AddFloat(f, region);
if (!stop && f->GetNextInFlow())
stop = f->GetNextInFlow();
}
// Recurse into our overflow container children
for (nsIFrame* oc = GetFirstChild(nsGkAtoms::overflowContainersList);
oc; oc = oc->GetNextSibling()) {
RecoverFloatsFor(oc, aFloatManager);
}
// Recurse into our normal children
for (nsBlockFrame::line_iterator line = begin_lines(); line != end_lines(); ++line) {
if (line->IsBlock()) {
RecoverFloatsFor(line->mFirstChild, aFloatManager);
}
}
}
void
nsBlockFrame::RecoverFloatsFor(nsIFrame* aFrame,
nsFloatManager& aFloatManager)
{
NS_PRECONDITION(aFrame, "null frame");
// Only blocks have floats
nsBlockFrame* block = nsLayoutUtils::GetAsBlock(aFrame);
// Don't recover any state inside a block that has its own space manager
// (we don't currently have any blocks like this, though, thanks to our
// use of extra frames for 'overflow')
if (block && !nsBlockFrame::BlockNeedsFloatManager(block)) {
// If the element is relatively positioned, then adjust x and y
// accordingly so that we consider relatively positioned frames
// at their original position.
nsPoint pos = block->GetPosition() - block->GetRelativeOffset();
aFloatManager.Translate(pos.x, pos.y);
block->RecoverFloats(aFloatManager);
aFloatManager.Translate(-pos.x, -pos.y);
}
}
//////////////////////////////////////////////////////////////////////
// Painting, event handling
PRIntn
nsBlockFrame::GetSkipSides() const
{
if (IS_TRUE_OVERFLOW_CONTAINER(this))
return (1 << NS_SIDE_TOP) | (1 << NS_SIDE_BOTTOM);
PRIntn skip = 0;
if (GetPrevInFlow()) {
skip |= 1 << NS_SIDE_TOP;
}
nsIFrame* nif = GetNextInFlow();
if (nif && !IS_TRUE_OVERFLOW_CONTAINER(nif)) {
skip |= 1 << NS_SIDE_BOTTOM;
}
return skip;
}
#ifdef DEBUG
static void ComputeCombinedArea(nsLineList& aLines,
nscoord aWidth, nscoord aHeight,
nsRect& aResult)
{
nscoord xa = 0, ya = 0, xb = aWidth, yb = aHeight;
for (nsLineList::iterator line = aLines.begin(), line_end = aLines.end();
line != line_end;
++line) {
// Compute min and max x/y values for the reflowed frame's
// combined areas
nsRect lineCombinedArea(line->GetCombinedArea());
nscoord x = lineCombinedArea.x;
nscoord y = lineCombinedArea.y;
nscoord xmost = x + lineCombinedArea.width;
nscoord ymost = y + lineCombinedArea.height;
if (x < xa) {
xa = x;
}
if (xmost > xb) {
xb = xmost;
}
if (y < ya) {
ya = y;
}
if (ymost > yb) {
yb = ymost;
}
}
aResult.x = xa;
aResult.y = ya;
aResult.width = xb - xa;
aResult.height = yb - ya;
}
#endif
PRBool
nsBlockFrame::IsVisibleInSelection(nsISelection* aSelection)
{
nsCOMPtr<nsIDOMHTMLHtmlElement> html(do_QueryInterface(mContent));
nsCOMPtr<nsIDOMHTMLBodyElement> body(do_QueryInterface(mContent));
if (html || body)
return PR_TRUE;
nsCOMPtr<nsIDOMNode> node(do_QueryInterface(mContent));
PRBool visible;
nsresult rv = aSelection->ContainsNode(node, PR_TRUE, &visible);
return NS_SUCCEEDED(rv) && visible;
}
/* virtual */ void
nsBlockFrame::PaintTextDecorationLine(gfxContext* aCtx,
const nsPoint& aPt,
nsLineBox* aLine,
nscolor aColor,
gfxFloat aOffset,
gfxFloat aAscent,
gfxFloat aSize,
const PRUint8 aDecoration)
{
NS_ASSERTION(!aLine->IsBlock(), "Why did we ask for decorations on a block?");
nscoord start = aLine->mBounds.x;
nscoord width = aLine->mBounds.width;
AdjustForTextIndent(aLine, start, width);
// Only paint if we have a positive width
if (width > 0) {
gfxPoint pt(PresContext()->AppUnitsToGfxUnits(start + aPt.x),
PresContext()->AppUnitsToGfxUnits(aLine->mBounds.y + aPt.y));
gfxSize size(PresContext()->AppUnitsToGfxUnits(width), aSize);
nsCSSRendering::PaintDecorationLine(
aCtx, aColor, pt, size,
PresContext()->AppUnitsToGfxUnits(aLine->GetAscent()),
aOffset, aDecoration, nsCSSRendering::DECORATION_STYLE_SOLID);
}
}
/*virtual*/ void
nsBlockFrame::AdjustForTextIndent(const nsLineBox* aLine,
nscoord& start,
nscoord& width)
{
if (!GetPrevContinuation() && aLine == begin_lines().get()) {
// Adjust for the text-indent. See similar code in
// nsLineLayout::BeginLineReflow.
nscoord indent = 0;
const nsStyleText* styleText = GetStyleText();
nsStyleUnit unit = styleText->mTextIndent.GetUnit();
if (eStyleUnit_Coord == unit) {
indent = styleText->mTextIndent.GetCoordValue();
} else if (eStyleUnit_Percent == unit) {
// It's a percentage of the containing block width.
nsIFrame* containingBlock =
nsHTMLReflowState::GetContainingBlockFor(this);
NS_ASSERTION(containingBlock, "Must have containing block!");
indent = nscoord(styleText->mTextIndent.GetPercentValue() *
containingBlock->GetContentRect().width);
}
// Adjust the start position and the width of the decoration by the
// value of the indent. Note that indent can be negative; that's OK.
// It'll just increase the width (which can also happen to be
// negative!).
start += indent;
width -= indent;
}
}
#ifdef DEBUG
static void DebugOutputDrawLine(PRInt32 aDepth, nsLineBox* aLine, PRBool aDrawn) {
if (nsBlockFrame::gNoisyDamageRepair) {
nsFrame::IndentBy(stdout, aDepth+1);
nsRect lineArea = aLine->GetCombinedArea();
printf("%s line=%p bounds=%d,%d,%d,%d ca=%d,%d,%d,%d\n",
aDrawn ? "draw" : "skip",
static_cast<void*>(aLine),
aLine->mBounds.x, aLine->mBounds.y,
aLine->mBounds.width, aLine->mBounds.height,
lineArea.x, lineArea.y,
lineArea.width, lineArea.height);
}
}
#endif
static nsresult
DisplayLine(nsDisplayListBuilder* aBuilder, const nsRect& aLineArea,
const nsRect& aDirtyRect, nsBlockFrame::line_iterator& aLine,
PRInt32 aDepth, PRInt32& aDrawnLines, const nsDisplayListSet& aLists,
nsBlockFrame* aFrame) {
// If the line's combined area (which includes child frames that
// stick outside of the line's bounding box or our bounding box)
// intersects the dirty rect then paint the line.
PRBool intersect = aLineArea.Intersects(aDirtyRect);
#ifdef DEBUG
if (nsBlockFrame::gLamePaintMetrics) {
aDrawnLines++;
}
DebugOutputDrawLine(aDepth, aLine.get(), intersect);
#endif
// The line might contain a placeholder for a visible out-of-flow, in which
// case we need to descend into it. If there is such a placeholder, we will
// have NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO set.
if (!intersect &&
!(aFrame->GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO))
return NS_OK;
nsresult rv;
nsDisplayList aboveTextDecorations;
PRBool lineInline = aLine->IsInline();
if (lineInline) {
// Display the text-decoration for the hypothetical anonymous inline box
// that wraps these inlines
rv = aFrame->DisplayTextDecorations(aBuilder, aLists.Content(),
&aboveTextDecorations, aLine);
NS_ENSURE_SUCCESS(rv, rv);
}
// Block-level child backgrounds go on the blockBorderBackgrounds list ...
// Inline-level child backgrounds go on the regular child content list.
nsDisplayListSet childLists(aLists,
lineInline ? aLists.Content() : aLists.BlockBorderBackgrounds());
nsIFrame* kid = aLine->mFirstChild;
PRInt32 n = aLine->GetChildCount();
while (--n >= 0) {
rv = aFrame->BuildDisplayListForChild(aBuilder, kid, aDirtyRect, childLists,
lineInline ? nsIFrame::DISPLAY_CHILD_INLINE : 0);
NS_ENSURE_SUCCESS(rv, rv);
kid = kid->GetNextSibling();
}
aLists.Content()->AppendToTop(&aboveTextDecorations);
return NS_OK;
}
NS_IMETHODIMP
nsBlockFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
PRInt32 drawnLines; // Will only be used if set (gLamePaintMetrics).
PRInt32 depth = 0;
#ifdef DEBUG
if (gNoisyDamageRepair) {
depth = GetDepth();
nsRect ca;
::ComputeCombinedArea(mLines, mRect.width, mRect.height, ca);
nsFrame::IndentBy(stdout, depth);
ListTag(stdout);
printf(": bounds=%d,%d,%d,%d dirty(absolute)=%d,%d,%d,%d ca=%d,%d,%d,%d\n",
mRect.x, mRect.y, mRect.width, mRect.height,
aDirtyRect.x, aDirtyRect.y, aDirtyRect.width, aDirtyRect.height,
ca.x, ca.y, ca.width, ca.height);
}
PRTime start = LL_ZERO; // Initialize these variables to silence the compiler.
if (gLamePaintMetrics) {
start = PR_Now();
drawnLines = 0;
}
#endif
DisplayBorderBackgroundOutline(aBuilder, aLists);
if (GetPrevInFlow()) {
DisplayOverflowContainers(aBuilder, aDirtyRect, aLists);
for (nsIFrame* f = mFloats.FirstChild(); f; f = f->GetNextSibling()) {
if (f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT)
BuildDisplayListForChild(aBuilder, f, aDirtyRect, aLists);
}
}
aBuilder->MarkFramesForDisplayList(this, mFloats, aDirtyRect);
aBuilder->MarkFramesForDisplayList(this, mAbsoluteContainer.GetChildList(),
aDirtyRect);
// Don't use the line cursor if we might have a descendant placeholder ...
// it might skip lines that contain placeholders but don't themselves
// intersect with the dirty area.
nsLineBox* cursor = GetStateBits() & NS_FRAME_FORCE_DISPLAY_LIST_DESCEND_INTO
? nsnull : GetFirstLineContaining(aDirtyRect.y);
line_iterator line_end = end_lines();
nsresult rv = NS_OK;
if (cursor) {
for (line_iterator line = mLines.begin(cursor);
line != line_end;
++line) {
nsRect lineArea = line->GetCombinedArea();
if (!lineArea.IsEmpty()) {
// Because we have a cursor, the combinedArea.ys are non-decreasing.
// Once we've passed aDirtyRect.YMost(), we can never see it again.
if (lineArea.y >= aDirtyRect.YMost()) {
break;
}
rv = DisplayLine(aBuilder, lineArea, aDirtyRect, line, depth, drawnLines,
aLists, this);
if (NS_FAILED(rv))
break;
}
}
} else {
PRBool nonDecreasingYs = PR_TRUE;
PRInt32 lineCount = 0;
nscoord lastY = PR_INT32_MIN;
nscoord lastYMost = PR_INT32_MIN;
for (line_iterator line = begin_lines();
line != line_end;
++line) {
nsRect lineArea = line->GetCombinedArea();
rv = DisplayLine(aBuilder, lineArea, aDirtyRect, line, depth, drawnLines,
aLists, this);
if (NS_FAILED(rv))
break;
if (!lineArea.IsEmpty()) {
if (lineArea.y < lastY
|| lineArea.YMost() < lastYMost) {
nonDecreasingYs = PR_FALSE;
}
lastY = lineArea.y;
lastYMost = lineArea.YMost();
}
lineCount++;
}
if (NS_SUCCEEDED(rv) && nonDecreasingYs && lineCount >= MIN_LINES_NEEDING_CURSOR) {
SetupLineCursor();
}
}
if (NS_SUCCEEDED(rv) && (nsnull != mBullet) && HaveOutsideBullet()) {
// Display outside bullets manually
rv = BuildDisplayListForChild(aBuilder, mBullet, aDirtyRect, aLists);
}
#ifdef DEBUG
if (gLamePaintMetrics) {
PRTime end = PR_Now();
PRInt32 numLines = mLines.size();
if (!numLines) numLines = 1;
PRTime lines, deltaPerLine, delta;
LL_I2L(lines, numLines);
LL_SUB(delta, end, start);
LL_DIV(deltaPerLine, delta, lines);
ListTag(stdout);
char buf[400];
PR_snprintf(buf, sizeof(buf),
": %lld elapsed (%lld per line) lines=%d drawn=%d skip=%d",
delta, deltaPerLine,
numLines, drawnLines, numLines - drawnLines);
printf("%s\n", buf);
}
#endif
return rv;
}
#ifdef ACCESSIBILITY
already_AddRefed<nsAccessible>
nsBlockFrame::CreateAccessible()
{
nsCOMPtr<nsIAccessibilityService> accService =
do_GetService("@mozilla.org/accessibilityService;1");
if (!accService) {
return nsnull;
}
nsPresContext* presContext = PresContext();
// block frame may be for <hr>
if (mContent->Tag() == nsGkAtoms::hr) {
return accService->CreateHTMLHRAccessible(mContent,
presContext->PresShell());
}
if (!mBullet || !presContext) {
if (!mContent->GetParent()) {
// Don't create accessible objects for the root content node, they are redundant with
// the nsDocAccessible object created with the document node
return nsnull;
}
nsCOMPtr<nsIDOMHTMLDocument> htmlDoc =
do_QueryInterface(mContent->GetDocument());
if (htmlDoc) {
nsCOMPtr<nsIDOMHTMLElement> body;
htmlDoc->GetBody(getter_AddRefs(body));
if (SameCOMIdentity(body, mContent)) {
// Don't create accessible objects for the body, they are redundant with
// the nsDocAccessible object created with the document node
return nsnull;
}
}
// Not a bullet, treat as normal HTML container
return accService->CreateHyperTextAccessible(mContent,
presContext->PresShell());
}
// Create special list bullet accessible
const nsStyleList* myList = GetStyleList();
nsAutoString bulletText;
if (myList->GetListStyleImage() ||
myList->mListStyleType == NS_STYLE_LIST_STYLE_DISC ||
myList->mListStyleType == NS_STYLE_LIST_STYLE_CIRCLE ||
myList->mListStyleType == NS_STYLE_LIST_STYLE_SQUARE) {
bulletText.Assign(PRUnichar(0x2022));; // Unicode bullet character
}
else if (myList->mListStyleType != NS_STYLE_LIST_STYLE_NONE) {
mBullet->GetListItemText(*myList, bulletText);
}
return accService->CreateHTMLLIAccessible(mContent, presContext->PresShell(),
bulletText);
}
#endif
void nsBlockFrame::ClearLineCursor()
{
if (!(GetStateBits() & NS_BLOCK_HAS_LINE_CURSOR)) {
return;
}
Properties().Delete(LineCursorProperty());
RemoveStateBits(NS_BLOCK_HAS_LINE_CURSOR);
}
void nsBlockFrame::SetupLineCursor()
{
if (GetStateBits() & NS_BLOCK_HAS_LINE_CURSOR
|| mLines.empty()) {
return;
}
Properties().Set(LineCursorProperty(), mLines.front());
AddStateBits(NS_BLOCK_HAS_LINE_CURSOR);
}
nsLineBox* nsBlockFrame::GetFirstLineContaining(nscoord y)
{
if (!(GetStateBits() & NS_BLOCK_HAS_LINE_CURSOR)) {
return nsnull;
}
FrameProperties props = Properties();
nsLineBox* property = static_cast<nsLineBox*>
(props.Get(LineCursorProperty()));
line_iterator cursor = mLines.begin(property);
nsRect cursorArea = cursor->GetCombinedArea();
while ((cursorArea.IsEmpty() || cursorArea.YMost() > y)
&& cursor != mLines.front()) {
cursor = cursor.prev();
cursorArea = cursor->GetCombinedArea();
}
while ((cursorArea.IsEmpty() || cursorArea.YMost() <= y)
&& cursor != mLines.back()) {
cursor = cursor.next();
cursorArea = cursor->GetCombinedArea();
}
if (cursor.get() != property) {
props.Set(LineCursorProperty(), cursor.get());
}
return cursor.get();
}
/* virtual */ void
nsBlockFrame::ChildIsDirty(nsIFrame* aChild)
{
// See if the child is absolutely positioned
if (aChild->GetStateBits() & NS_FRAME_OUT_OF_FLOW &&
aChild->GetStyleDisplay()->IsAbsolutelyPositioned()) {
// do nothing
} else if (aChild == mBullet && HaveOutsideBullet()) {
// The bullet lives in the first line, unless the first line has
// height 0 and there is a second line, in which case it lives
// in the second line.
line_iterator bulletLine = begin_lines();
if (bulletLine != end_lines() && bulletLine->mBounds.height == 0 &&
bulletLine != mLines.back()) {
bulletLine = bulletLine.next();
}
if (bulletLine != end_lines()) {
MarkLineDirty(bulletLine);
}
// otherwise we have an empty line list, and ReflowDirtyLines
// will handle reflowing the bullet.
} else {
// Mark the line containing the child frame dirty. We would rather do this
// in MarkIntrinsicWidthsDirty but that currently won't tell us which
// child is being dirtied.
PRBool isValid;
nsBlockInFlowLineIterator iter(this, aChild, &isValid);
if (isValid) {
iter.GetContainer()->MarkLineDirty(iter.GetLine(), iter.GetLineList());
}
}
nsBlockFrameSuper::ChildIsDirty(aChild);
}
NS_IMETHODIMP
nsBlockFrame::Init(nsIContent* aContent,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
if (aPrevInFlow) {
// Copy over the block frame type flags
nsBlockFrame* blockFrame = (nsBlockFrame*)aPrevInFlow;
// Don't copy NS_BLOCK_HAS_FIRST_LETTER_CHILD as that is set on the first
// continuation only.
SetFlags(blockFrame->mState &
(NS_BLOCK_FLAGS_MASK &
(~NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET &
~NS_BLOCK_HAS_FIRST_LETTER_CHILD)));
}
nsresult rv = nsBlockFrameSuper::Init(aContent, aParent, aPrevInFlow);
if (!aPrevInFlow ||
aPrevInFlow->GetStateBits() & NS_BLOCK_NEEDS_BIDI_RESOLUTION)
AddStateBits(NS_BLOCK_NEEDS_BIDI_RESOLUTION);
return rv;
}
NS_IMETHODIMP
nsBlockFrame::SetInitialChildList(nsIAtom* aListName,
nsFrameList& aChildList)
{
nsresult rv = NS_OK;
if (nsGkAtoms::absoluteList == aListName) {
mAbsoluteContainer.SetInitialChildList(this, aListName, aChildList);
}
else if (nsGkAtoms::floatList == aListName) {
mFloats.SetFrames(aChildList);
}
else {
nsPresContext* presContext = PresContext();
#ifdef DEBUG
// The only times a block that is an anonymous box is allowed to have a
// first-letter frame are when it's the block inside a non-anonymous cell,
// the block inside a fieldset, a scrolled content block, or a column
// content block. Note that this means that blocks which are the anonymous
// block in {ib} splits do NOT get first-letter frames. Note that
// NS_BLOCK_HAS_FIRST_LETTER_STYLE gets set on all continuations of the
// block.
nsIAtom *pseudo = GetStyleContext()->GetPseudo();
PRBool haveFirstLetterStyle =
(!pseudo ||
(pseudo == nsCSSAnonBoxes::cellContent &&
mParent->GetStyleContext()->GetPseudo() == nsnull) ||
pseudo == nsCSSAnonBoxes::fieldsetContent ||
pseudo == nsCSSAnonBoxes::scrolledContent ||
pseudo == nsCSSAnonBoxes::columnContent) &&
!IsFrameOfType(eMathML) &&
nsRefPtr<nsStyleContext>(GetFirstLetterStyle(presContext)) != nsnull;
NS_ASSERTION(haveFirstLetterStyle ==
((mState & NS_BLOCK_HAS_FIRST_LETTER_STYLE) != 0),
"NS_BLOCK_HAS_FIRST_LETTER_STYLE state out of sync");
#endif
rv = AddFrames(aChildList, nsnull);
if (NS_FAILED(rv)) {
return rv;
}
// Create a list bullet if this is a list-item. Note that this is
// done here so that RenumberLists will work (it needs the bullets
// to store the bullet numbers). Also note that due to various
// wrapper frames (scrollframes, columns) we want to use the
// outermost (primary, ideally, but it's not set yet when we get
// here) frame of our content for the display check. On the other
// hand, we look at ourselves for the GetPrevInFlow() check, since
// for a columnset we don't want a bullet per column. Note that
// the outermost frame for the content is the primary frame in
// most cases; the ones when it's not (like tables) can't be
// NS_STYLE_DISPLAY_LIST_ITEM).
nsIFrame* possibleListItem = this;
while (1) {
nsIFrame* parent = possibleListItem->GetParent();
if (parent->GetContent() != GetContent()) {
break;
}
possibleListItem = parent;
}
if ((nsnull == GetPrevInFlow()) &&
(NS_STYLE_DISPLAY_LIST_ITEM ==
possibleListItem->GetStyleDisplay()->mDisplay) &&
(nsnull == mBullet)) {
// Resolve style for the bullet frame
const nsStyleList* styleList = GetStyleList();
nsCSSPseudoElements::Type pseudoType;
switch (styleList->mListStyleType) {
case NS_STYLE_LIST_STYLE_DISC:
case NS_STYLE_LIST_STYLE_CIRCLE:
case NS_STYLE_LIST_STYLE_SQUARE:
pseudoType = nsCSSPseudoElements::ePseudo_mozListBullet;
break;
default:
pseudoType = nsCSSPseudoElements::ePseudo_mozListNumber;
break;
}
nsIPresShell *shell = presContext->PresShell();
nsStyleContext* parentStyle =
CorrectStyleParentFrame(this,
nsCSSPseudoElements::GetPseudoAtom(pseudoType))->GetStyleContext();
nsRefPtr<nsStyleContext> kidSC = shell->StyleSet()->
ResolvePseudoElementStyle(mContent->AsElement(), pseudoType,
parentStyle);
// Create bullet frame
nsBulletFrame* bullet = new (shell) nsBulletFrame(kidSC);
if (nsnull == bullet) {
return NS_ERROR_OUT_OF_MEMORY;
}
bullet->Init(mContent, this, nsnull);
// If the list bullet frame should be positioned inside then add
// it to the flow now.
if (NS_STYLE_LIST_STYLE_POSITION_INSIDE ==
styleList->mListStylePosition) {
nsFrameList bulletList(bullet, bullet);
AddFrames(bulletList, nsnull);
mState &= ~NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET;
}
else {
mState |= NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET;
}
mBullet = bullet;
}
}
return NS_OK;
}
PRBool
nsBlockFrame::BulletIsEmpty() const
{
NS_ASSERTION(mContent->GetPrimaryFrame()->GetStyleDisplay()->mDisplay ==
NS_STYLE_DISPLAY_LIST_ITEM &&
HaveOutsideBullet(),
"should only care when we have an outside bullet");
const nsStyleList* list = GetStyleList();
return list->mListStyleType == NS_STYLE_LIST_STYLE_NONE &&
!list->GetListStyleImage();
}
// static
PRBool
nsBlockFrame::FrameStartsCounterScope(nsIFrame* aFrame)
{
nsIContent* content = aFrame->GetContent();
if (!content || !content->IsHTML())
return PR_FALSE;
nsIAtom *localName = content->NodeInfo()->NameAtom();
return localName == nsGkAtoms::ol ||
localName == nsGkAtoms::ul ||
localName == nsGkAtoms::dir ||
localName == nsGkAtoms::menu;
}
PRBool
nsBlockFrame::RenumberLists(nsPresContext* aPresContext)
{
if (!FrameStartsCounterScope(this)) {
// If this frame doesn't start a counter scope then we don't need
// to renumber child list items.
return PR_FALSE;
}
// Setup initial list ordinal value
// XXX Map html's start property to counter-reset style
PRInt32 ordinal = 1;
nsGenericHTMLElement *hc = nsGenericHTMLElement::FromContent(mContent);
if (hc) {
const nsAttrValue* attr = hc->GetParsedAttr(nsGkAtoms::start);
if (attr && attr->Type() == nsAttrValue::eInteger) {
ordinal = attr->GetIntegerValue();
}
}
// Get to first-in-flow
nsBlockFrame* block = (nsBlockFrame*) GetFirstInFlow();
return RenumberListsInBlock(aPresContext, block, &ordinal, 0);
}
PRBool
nsBlockFrame::RenumberListsInBlock(nsPresContext* aPresContext,
nsBlockFrame* aBlockFrame,
PRInt32* aOrdinal,
PRInt32 aDepth)
{
// Examine each line in the block
PRBool foundValidLine;
nsBlockInFlowLineIterator bifLineIter(aBlockFrame, &foundValidLine);
if (!foundValidLine)
return PR_FALSE;
PRBool renumberedABullet = PR_FALSE;
do {
nsLineList::iterator line = bifLineIter.GetLine();
nsIFrame* kid = line->mFirstChild;
PRInt32 n = line->GetChildCount();
while (--n >= 0) {
PRBool kidRenumberedABullet = RenumberListsFor(aPresContext, kid, aOrdinal, aDepth);
if (kidRenumberedABullet) {
line->MarkDirty();
renumberedABullet = PR_TRUE;
}
kid = kid->GetNextSibling();
}
} while (bifLineIter.Next());
return renumberedABullet;
}
PRBool
nsBlockFrame::RenumberListsFor(nsPresContext* aPresContext,
nsIFrame* aKid,
PRInt32* aOrdinal,
PRInt32 aDepth)
{
NS_PRECONDITION(aPresContext && aKid && aOrdinal, "null params are immoral!");
// add in a sanity check for absurdly deep frame trees. See bug 42138
if (MAX_DEPTH_FOR_LIST_RENUMBERING < aDepth)
return PR_FALSE;
// if the frame is a placeholder, then get the out of flow frame
nsIFrame* kid = nsPlaceholderFrame::GetRealFrameFor(aKid);
// drill down through any wrappers to the real frame
kid = kid->GetContentInsertionFrame();
// possible there is no content insertion frame
if (!kid)
return PR_FALSE;
PRBool kidRenumberedABullet = PR_FALSE;
// If the frame is a list-item and the frame implements our
// block frame API then get its bullet and set the list item
// ordinal.
const nsStyleDisplay* display = kid->GetStyleDisplay();
if (NS_STYLE_DISPLAY_LIST_ITEM == display->mDisplay) {
// Make certain that the frame is a block frame in case
// something foreign has crept in.
nsBlockFrame* listItem = nsLayoutUtils::GetAsBlock(kid);
if (listItem) {
if (nsnull != listItem->mBullet) {
PRBool changed;
*aOrdinal = listItem->mBullet->SetListItemOrdinal(*aOrdinal,
&changed);
if (changed) {
kidRenumberedABullet = PR_TRUE;
// The ordinal changed - mark the bullet frame dirty.
listItem->ChildIsDirty(listItem->mBullet);
}
}
// XXX temporary? if the list-item has child list-items they
// should be numbered too; especially since the list-item is
// itself (ASSUMED!) not to be a counter-resetter.
PRBool meToo = RenumberListsInBlock(aPresContext, listItem, aOrdinal, aDepth + 1);
if (meToo) {
kidRenumberedABullet = PR_TRUE;
}
}
}
else if (NS_STYLE_DISPLAY_BLOCK == display->mDisplay) {
if (FrameStartsCounterScope(kid)) {
// Don't bother recursing into a block frame that is a new
// counter scope. Any list-items in there will be handled by
// it.
}
else {
// If the display=block element is a block frame then go ahead
// and recurse into it, as it might have child list-items.
nsBlockFrame* kidBlock = nsLayoutUtils::GetAsBlock(kid);
if (kidBlock) {
kidRenumberedABullet = RenumberListsInBlock(aPresContext, kidBlock, aOrdinal, aDepth + 1);
}
}
}
return kidRenumberedABullet;
}
void
nsBlockFrame::ReflowBullet(nsBlockReflowState& aState,
nsHTMLReflowMetrics& aMetrics,
nscoord aLineTop)
{
const nsHTMLReflowState &rs = aState.mReflowState;
// Reflow the bullet now
nsSize availSize;
// Make up a width since it doesn't really matter (XXX).
availSize.width = aState.mContentArea.width;
availSize.height = NS_UNCONSTRAINEDSIZE;
// Get the reason right.
// XXXwaterson Should this look just like the logic in
// nsBlockReflowContext::ReflowBlock and nsLineLayout::ReflowFrame?
nsHTMLReflowState reflowState(aState.mPresContext, rs,
mBullet, availSize);
nsReflowStatus status;
mBullet->WillReflow(aState.mPresContext);
mBullet->Reflow(aState.mPresContext, aMetrics, reflowState, status);
// Get the float available space using our saved state from before we
// started reflowing the block, so that we ignore any floats inside
// the block.
// FIXME: aLineTop isn't actually set correctly by some callers, since
// they reposition the line.
nsRect floatAvailSpace =
aState.GetFloatAvailableSpaceWithState(aLineTop,
&aState.mFloatManagerStateBefore)
.mRect;
// FIXME (bug 25888): need to check the entire region that the first
// line overlaps, not just the top pixel.
// Place the bullet now. We want to place the bullet relative to the
// border-box of the associated block (using the right/left margin of
// the bullet frame as separation). However, if a line box would be
// displaced by floats that are *outside* the associated block, we
// want to displace it by the same amount. That is, we act as though
// the edge of the floats is the content-edge of the block, and place
// the bullet at a position offset from there by the block's padding,
// the block's border, and the bullet frame's margin.
nscoord x;
if (rs.mStyleVisibility->mDirection == NS_STYLE_DIRECTION_LTR) {
// The floatAvailSpace.x gives us the content/float edge. Then we
// subtract out the left border/padding and the bullet's width and
// margin to offset the position.
x = floatAvailSpace.x - rs.mComputedBorderPadding.left
- reflowState.mComputedMargin.right - aMetrics.width;
} else {
// The XMost() of the available space give us offsets from the left
// border edge. Then we add the right border/padding and the
// bullet's margin to offset the position.
x = floatAvailSpace.XMost() + rs.mComputedBorderPadding.right
+ reflowState.mComputedMargin.left;
}
// Approximate the bullets position; vertical alignment will provide
// the final vertical location.
nscoord y = aState.mContentArea.y;
mBullet->SetRect(nsRect(x, y, aMetrics.width, aMetrics.height));
mBullet->DidReflow(aState.mPresContext, &aState.mReflowState, NS_FRAME_REFLOW_FINISHED);
}
// This is used to scan frames for any float placeholders, add their
// floats to the list represented by aList, and remove the
// floats from whatever list they might be in. We don't search descendants
// that are float containing blocks. The floats must be children of 'this'.
void nsBlockFrame::CollectFloats(nsIFrame* aFrame, nsFrameList& aList,
PRBool aFromOverflow, PRBool aCollectSiblings) {
while (aFrame) {
// Don't descend into float containing blocks.
if (!aFrame->IsFloatContainingBlock()) {
nsIFrame *outOfFlowFrame =
aFrame->GetType() == nsGkAtoms::placeholderFrame ?
nsLayoutUtils::GetFloatFromPlaceholder(aFrame) : nsnull;
if (outOfFlowFrame) {
if (outOfFlowFrame->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT) {
if (outOfFlowFrame->GetParent() == this) {
nsFrameList* list = GetPushedFloats();
if (!list || !list->RemoveFrameIfPresent(outOfFlowFrame)) {
if (aFromOverflow) {
nsAutoOOFFrameList oofs(this);
oofs.mList.RemoveFrame(outOfFlowFrame);
} else {
mFloats.RemoveFrame(outOfFlowFrame);
}
}
aList.AppendFrame(nsnull, outOfFlowFrame);
}
// FIXME: By not pulling floats whose parent is one of our
// later siblings, are we risking the pushed floats getting
// out-of-order?
} else {
// Make sure that its parent is us. Otherwise we don't want
// to mess around with it because it belongs to someone
// else. I think this could happen if the overflow lines
// contain a block descendant which owns its own floats.
NS_ASSERTION(outOfFlowFrame->GetParent() == this,
"Out of flow frame doesn't have the expected parent");
if (aFromOverflow) {
nsAutoOOFFrameList oofs(this);
oofs.mList.RemoveFrame(outOfFlowFrame);
} else {
mFloats.RemoveFrame(outOfFlowFrame);
}
aList.AppendFrame(nsnull, outOfFlowFrame);
}
}
CollectFloats(aFrame->GetFirstChild(nsnull),
aList, aFromOverflow, PR_TRUE);
// Note: Even though we're calling CollectFloats on aFrame's overflow
// list, we'll pass down aFromOverflow unchanged because we're still
// traversing the regular-children subtree of the 'this' frame.
CollectFloats(aFrame->GetFirstChild(nsGkAtoms::overflowList),
aList, aFromOverflow, PR_TRUE);
}
if (!aCollectSiblings)
break;
aFrame = aFrame->GetNextSibling();
}
}
void
nsBlockFrame::CheckFloats(nsBlockReflowState& aState)
{
#ifdef DEBUG
// If any line is still dirty, that must mean we're going to reflow this
// block again soon (e.g. because we bailed out after noticing that
// clearance was imposed), so don't worry if the floats are out of sync.
PRBool anyLineDirty = PR_FALSE;
// Check that the float list is what we would have built
nsAutoTArray<nsIFrame*, 8> lineFloats;
for (line_iterator line = begin_lines(), line_end = end_lines();
line != line_end; ++line) {
if (line->HasFloats()) {
nsFloatCache* fc = line->GetFirstFloat();
while (fc) {
lineFloats.AppendElement(fc->mFloat);
fc = fc->Next();
}
}
if (line->IsDirty()) {
anyLineDirty = PR_TRUE;
}
}
nsAutoTArray<nsIFrame*, 8> storedFloats;
PRBool equal = PR_TRUE;
PRUint32 i = 0;
for (nsIFrame* f = mFloats.FirstChild(); f; f = f->GetNextSibling()) {
if (f->GetStateBits() & NS_FRAME_IS_PUSHED_FLOAT)
continue;
storedFloats.AppendElement(f);
if (i < lineFloats.Length() && lineFloats.ElementAt(i) != f) {
equal = PR_FALSE;
}
++i;
}
if ((!equal || lineFloats.Length() != storedFloats.Length()) && !anyLineDirty) {
NS_WARNING("nsBlockFrame::CheckFloats: Explicit float list is out of sync with float cache");
#if defined(DEBUG_roc)
nsFrame::RootFrameList(PresContext(), stdout, 0);
for (i = 0; i < lineFloats.Length(); ++i) {
printf("Line float: %p\n", lineFloats.ElementAt(i));
}
for (i = 0; i < storedFloats.Length(); ++i) {
printf("Stored float: %p\n", storedFloats.ElementAt(i));
}
#endif
}
#endif
const nsFrameList* oofs = GetOverflowOutOfFlows();
if (oofs && oofs->NotEmpty()) {
// Floats that were pushed should be removed from our float
// manager. Otherwise the float manager's YMost or XMost might
// be larger than necessary, causing this block to get an
// incorrect desired height (or width). Some of these floats
// may not actually have been added to the float manager because
// they weren't reflowed before being pushed; that's OK,
// RemoveRegions will ignore them. It is safe to do this here
// because we know from here on the float manager will only be
// used for its XMost and YMost, not to place new floats and
// lines.
aState.mFloatManager->RemoveTrailingRegions(oofs->FirstChild());
}
}
/* static */
PRBool
nsBlockFrame::BlockIsMarginRoot(nsIFrame* aBlock)
{
NS_PRECONDITION(aBlock, "Must have a frame");
NS_ASSERTION(nsLayoutUtils::GetAsBlock(aBlock), "aBlock must be a block");
nsIFrame* parent = aBlock->GetParent();
return (aBlock->GetStateBits() & NS_BLOCK_MARGIN_ROOT) ||
(parent && !parent->IsFloatContainingBlock() &&
parent->GetType() != nsGkAtoms::columnSetFrame);
}
/* static */
PRBool
nsBlockFrame::BlockNeedsFloatManager(nsIFrame* aBlock)
{
NS_PRECONDITION(aBlock, "Must have a frame");
NS_ASSERTION(nsLayoutUtils::GetAsBlock(aBlock), "aBlock must be a block");
nsIFrame* parent = aBlock->GetParent();
return (aBlock->GetStateBits() & NS_BLOCK_FLOAT_MGR) ||
(parent && !parent->IsFloatContainingBlock());
}
/* static */
PRBool
nsBlockFrame::BlockCanIntersectFloats(nsIFrame* aFrame)
{
return aFrame->IsFrameOfType(nsIFrame::eBlockFrame) &&
!aFrame->IsFrameOfType(nsIFrame::eReplaced) &&
!(aFrame->GetStateBits() & NS_BLOCK_FLOAT_MGR);
}
// Note that this width can vary based on the vertical position.
// However, the cases where it varies are the cases where the width fits
// in the available space given, which means that variation shouldn't
// matter.
/* static */
nsBlockFrame::ReplacedElementWidthToClear
nsBlockFrame::WidthToClearPastFloats(nsBlockReflowState& aState,
const nsRect& aFloatAvailableSpace,
nsIFrame* aFrame)
{
nscoord leftOffset, rightOffset;
nsCSSOffsetState offsetState(aFrame, aState.mReflowState.rendContext,
aState.mContentArea.width);
ReplacedElementWidthToClear result;
// A table outer frame is an exception in that it is a block child
// that is not a containing block for its children.
if (aFrame->GetType() == nsGkAtoms::tableOuterFrame) {
nsIFrame *innerTable = aFrame->GetFirstChild(nsnull);
nsIFrame *caption = aFrame->GetFirstChild(nsGkAtoms::captionList);
nsMargin tableMargin, captionMargin;
{
nsCSSOffsetState tableOS(innerTable, aState.mReflowState.rendContext,
aState.mContentArea.width);
tableMargin = tableOS.mComputedMargin;
}
if (caption) {
nsCSSOffsetState captionOS(caption, aState.mReflowState.rendContext,
aState.mContentArea.width);
captionMargin = captionOS.mComputedMargin;
}
PRUint8 captionSide;
if (!caption ||
((captionSide = caption->GetStyleTableBorder()->mCaptionSide)
== NS_STYLE_CAPTION_SIDE_TOP ||
captionSide == NS_STYLE_CAPTION_SIDE_BOTTOM)) {
result.marginLeft = tableMargin.left;
result.marginRight = tableMargin.right;
} else if (captionSide == NS_STYLE_CAPTION_SIDE_TOP_OUTSIDE ||
captionSide == NS_STYLE_CAPTION_SIDE_BOTTOM_OUTSIDE) {
// FIXME: This doesn't treat the caption and table independently,
// since we adjust by only the smaller margin, and the table outer
// frame doesn't know about it.
result.marginLeft = NS_MIN(tableMargin.left, captionMargin.left);
result.marginRight = NS_MIN(tableMargin.right, captionMargin.right);
} else {
NS_ASSERTION(captionSide == NS_STYLE_CAPTION_SIDE_LEFT ||
captionSide == NS_STYLE_CAPTION_SIDE_RIGHT,
"unexpected caption-side");
if (captionSide == NS_STYLE_CAPTION_SIDE_LEFT) {
result.marginLeft = captionMargin.left;
result.marginRight = tableMargin.right;
} else {
result.marginLeft = tableMargin.left;
result.marginRight = captionMargin.right;
}
}
aState.ComputeReplacedBlockOffsetsForFloats(aFrame, aFloatAvailableSpace,
leftOffset, rightOffset,
&result);
// result.marginLeft has already been subtracted from leftOffset (etc.)
nscoord availWidth = aState.mContentArea.width - leftOffset - rightOffset;
// Force the outer frame to shrink-wrap (otherwise it just sizes to
// the available width unconditionally).
result.borderBoxWidth =
aFrame->ComputeSize(aState.mReflowState.rendContext,
nsSize(aState.mContentArea.width,
NS_UNCONSTRAINEDSIZE),
availWidth,
nsSize(offsetState.mComputedMargin.LeftRight(),
offsetState.mComputedMargin.TopBottom()),
nsSize(offsetState.mComputedBorderPadding.LeftRight() -
offsetState.mComputedPadding.LeftRight(),
offsetState.mComputedBorderPadding.TopBottom() -
offsetState.mComputedPadding.TopBottom()),
nsSize(offsetState.mComputedPadding.LeftRight(),
offsetState.mComputedPadding.TopBottom()),
PR_TRUE).width +
offsetState.mComputedBorderPadding.LeftRight() -
(result.marginLeft + result.marginRight);
} else {
aState.ComputeReplacedBlockOffsetsForFloats(aFrame, aFloatAvailableSpace,
leftOffset, rightOffset);
nscoord availWidth = aState.mContentArea.width - leftOffset - rightOffset;
// We actually don't want the min width here; see bug 427782; we only
// want to displace if the width won't compute to a value small enough
// to fit.
// All we really need here is the result of ComputeSize, and we
// could *almost* get that from an nsCSSOffsetState, except for the
// last argument.
nsSize availSpace(availWidth, NS_UNCONSTRAINEDSIZE);
nsHTMLReflowState reflowState(aState.mPresContext, aState.mReflowState,
aFrame, availSpace);
result.borderBoxWidth = reflowState.ComputedWidth() +
reflowState.mComputedBorderPadding.LeftRight();
// Use the margins from offsetState rather than reflowState so that
// they aren't reduced by ignoring margins in overconstrained cases.
result.marginLeft = offsetState.mComputedMargin.left;
result.marginRight = offsetState.mComputedMargin.right;
}
return result;
}
/* static */
nsBlockFrame*
nsBlockFrame::GetNearestAncestorBlock(nsIFrame* aCandidate)
{
nsBlockFrame* block = nsnull;
while(aCandidate) {
block = nsLayoutUtils::GetAsBlock(aCandidate);
if (block) {
// yay, candidate is a block!
return block;
}
// Not a block. Check its parent next.
aCandidate = aCandidate->GetParent();
}
NS_NOTREACHED("Fell off frame tree looking for ancestor block!");
return nsnull;
}
#ifdef IBMBIDI
nsresult
nsBlockFrame::ResolveBidi()
{
NS_ASSERTION(!GetPrevInFlow(),
"ResolveBidi called on non-first continuation");
nsPresContext* presContext = PresContext();
if (!presContext->BidiEnabled()) {
return NS_OK;
}
nsBidiPresUtils* bidiUtils = presContext->GetBidiUtils();
if (!bidiUtils)
return NS_ERROR_NULL_POINTER;
return bidiUtils->Resolve(this);
}
#endif
#ifdef DEBUG
void
nsBlockFrame::VerifyLines(PRBool aFinalCheckOK)
{
if (!gVerifyLines) {
return;
}
if (mLines.empty()) {
return;
}
// Add up the counts on each line. Also validate that IsFirstLine is
// set properly.
PRInt32 count = 0;
PRBool seenBlock = PR_FALSE;
line_iterator line, line_end;
for (line = begin_lines(), line_end = end_lines();
line != line_end;
++line) {
if (aFinalCheckOK) {
NS_ABORT_IF_FALSE(line->GetChildCount(), "empty line");
if (line->IsBlock()) {
seenBlock = PR_TRUE;
}
if (line->IsBlock()) {
NS_ASSERTION(1 == line->GetChildCount(), "bad first line");
}
}
count += line->GetChildCount();
}
// Then count the frames
PRInt32 frameCount = 0;
nsIFrame* frame = mLines.front()->mFirstChild;
while (frame) {
frameCount++;
frame = frame->GetNextSibling();
}
NS_ASSERTION(count == frameCount, "bad line list");
// Next: test that each line has right number of frames on it
for (line = begin_lines(), line_end = end_lines();
line != line_end;
) {
count = line->GetChildCount();
frame = line->mFirstChild;
while (--count >= 0) {
frame = frame->GetNextSibling();
}
++line;
if ((line != line_end) && (0 != line->GetChildCount())) {
NS_ASSERTION(frame == line->mFirstChild, "bad line list");
}
}
}
// Its possible that a frame can have some frames on an overflow
// list. But its never possible for multiple frames to have overflow
// lists. Check that this fact is actually true.
void
nsBlockFrame::VerifyOverflowSituation()
{
nsBlockFrame* flow = (nsBlockFrame*) GetFirstInFlow();
while (nsnull != flow) {
nsLineList* overflowLines = GetOverflowLines();
if (nsnull != overflowLines) {
NS_ASSERTION(! overflowLines->empty(), "should not be empty if present");
NS_ASSERTION(overflowLines->front()->mFirstChild, "bad overflow list");
}
flow = (nsBlockFrame*) flow->GetNextInFlow();
}
}
PRInt32
nsBlockFrame::GetDepth() const
{
PRInt32 depth = 0;
nsIFrame* parent = mParent;
while (parent) {
parent = parent->GetParent();
depth++;
}
return depth;
}
#endif
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