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gecko-dev/layout/generic/nsBlockReflowState.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (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/NPL/
*
* 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 Netscape are Copyright (C) 1998
* Netscape Communications Corporation. All Rights Reserved.
*/
#include "nsCOMPtr.h"
#include "nsBlockFrame.h"
#include "nsBlockReflowContext.h"
#include "nsBlockBandData.h"
#include "nsBulletFrame.h"
#include "nsLineBox.h"
#include "nsLineLayout.h"
#include "nsPlaceholderFrame.h"
#include "nsStyleConsts.h"
#include "nsHTMLIIDs.h"
#include "nsCSSRendering.h"
#include "nsIPresContext.h"
#include "nsIPresShell.h"
#include "nsIReflowCommand.h"
#include "nsISpaceManager.h"
#include "nsIStyleContext.h"
#include "nsIView.h"
#include "nsIFontMetrics.h"
#include "nsHTMLParts.h"
#include "nsHTMLAtoms.h"
#include "nsHTMLValue.h"
#include "nsDOMEvent.h"
#include "nsIHTMLContent.h"
#include "prprf.h"
#include "nsLayoutAtoms.h"
// XXX temporary for :first-letter support
#include "nsITextContent.h"
static NS_DEFINE_IID(kITextContentIID, NS_ITEXT_CONTENT_IID);/* XXX */
// XXX for IsEmptyLine
#include "nsTextFragment.h"
// XXX get rid of the need for this
#define SLOW_INCREMENTAL_REFLOW
#ifdef NS_DEBUG
#undef NOISY_FIRST_LINE
#undef REALLY_NOISY_FIRST_LINE
#undef NOISY_FIRST_LETTER
#undef NOISY_MAX_ELEMENT_SIZE
#undef NOISY_FLOATER_CLEARING
#undef NOISY_INCREMENTAL_REFLOW
#undef NOISY_FINAL_SIZE
#undef NOISY_REMOVE_FRAME
#undef NOISY_DAMAGE_REPAIR
#undef NOISY_COMBINED_AREA
#undef NOISY_VERTICAL_MARGINS
#undef REFLOW_STATUS_COVERAGE
#else
#undef NOISY_FIRST_LINE
#undef REALLY_NOISY_FIRST_LINE
#undef NOISY_FIRST_LETTER
#undef NOISY_MAX_ELEMENT_SIZE
#undef NOISY_FLOATER_CLEARING
#undef NOISY_INCREMENTAL_REFLOW
#undef NOISY_FINAL_SIZE
#undef NOISY_REMOVE_FRAME
#undef NOISY_DAMAGE_REPAIR
#undef NOISY_COMBINED_AREA
#undef NOISY_VERTICAL_MARGINS
#undef REFLOW_STATUS_COVERAGE
#endif
//----------------------------------------------------------------------
// Debugging support code
#ifdef NOISY_INCREMENTAL_REFLOW
static PRInt32 gNoiseIndent;
static const char* kReflowCommandType[] = {
"FrameAppended",
"FrameInserted",
"FrameRemoved",
"ContentChanged",
"StyleChanged",
"PullupReflow",
"PushReflow",
"CheckPullupReflow",
"ReflowDirty",
"UserDefined",
};
#endif
#ifdef REALLY_NOISY_FIRST_LINE
static void
DumpStyleGeneaology(nsIFrame* aFrame, const char* gap)
{
fputs(gap, stdout);
nsFrame::ListTag(stdout, aFrame);
printf(": ");
nsIStyleContext* sc;
aFrame->GetStyleContext(&sc);
while (nsnull != sc) {
nsIStyleContext* psc;
printf("%p ", sc);
psc = sc->GetParent();
NS_RELEASE(sc);
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
//----------------------------------------------------------------------
inline void CombineRects(const nsRect& r1, nsRect& r2)
{
nscoord x0 = r2.x;
nscoord y0 = r2.y;
nscoord x1 = x0 + r2.width;
nscoord y1 = y0 + r2.height;
nscoord x = r1.x;
nscoord y = r1.y;
nscoord xmost = x + r1.width;
nscoord ymost = y + r1.height;
if (x < x0) {
x0 = x;
}
if (xmost > x1) {
x1 = xmost;
}
if (y < y0) {
y0 = y;
}
if (ymost > y1) {
y1 = ymost;
}
r2.x = x0;
r2.y = y0;
r2.width = x1 - x0;
r2.height = y1 - y0;
}
//----------------------------------------------------------------------
class nsBlockReflowState {
public:
nsBlockReflowState(const nsHTMLReflowState& aReflowState,
nsIPresContext& aPresContext,
nsBlockFrame* aFrame,
const nsHTMLReflowMetrics& aMetrics,
nsLineLayout* aLineLayout);
~nsBlockReflowState();
/**
* Update the mCurrentBand data based on the current mY position.
*/
void GetAvailableSpace();
void InitFloater(nsPlaceholderFrame* aPlaceholderFrame);
void AddFloater(nsPlaceholderFrame* aPlaceholderFrame,
PRBool aInitialReflow);
PRBool CanPlaceFloater(const nsRect& aFloaterRect, PRUint8 aFloats);
void PlaceFloater(nsPlaceholderFrame* aFloater, PRBool* aIsLeftFloater,
nsPoint* aNewOrigin);
void PlaceBelowCurrentLineFloaters(nsVoidArray* aFloaters,
PRBool aReflowFloaters);
void PlaceCurrentLineFloaters(nsVoidArray* aFloaters);
void ClearFloaters(nscoord aY, PRUint8 aBreakType);
PRBool IsLeftMostChild(nsIFrame* aFrame);
PRBool IsAdjacentWithTop() const {
return mY == mReflowState.mComputedBorderPadding.top;
}
const nsMargin& BorderPadding() const {
return mReflowState.mComputedBorderPadding;
}
nsIPresContext& mPresContext;
const nsHTMLReflowState& mReflowState;
nsLineLayout* mLineLayout;
nsISpaceManager* mSpaceManager;
nscoord mSpaceManagerX, mSpaceManagerY;
nsBlockFrame* mBlock;
nsBlockFrame* mNextInFlow;
nsReflowStatus mReflowStatus;
nscoord mBottomEdge; // maximum Y
PRBool mUnconstrainedWidth;
PRBool mUnconstrainedHeight;
nscoord mY;
nscoord mKidXMost;
nsRect mFloaterCombinedArea;
// Previous child. This is used when pulling up a frame to update
// the sibling list.
nsIFrame* mPrevChild;
nsVoidArray mPendingFloaters;
nsLineBox* mCurrentLine;
nsLineBox* mPrevLine;
nsBlockBandData mCurrentBand;
nsRect mAvailSpaceRect;
nscoord mMinLineHeight;
PRBool mComputeMaxElementSize;
nsSize mMaxElementSize;
// The content area to reflow child frames within. The x/y
// coordinates are known to be mBorderPadding.left and
// mBorderPadding.top. The width/height may be NS_UNCONSTRAINEDSIZE
// if the container reflowing this frame has given the frame an
// unconstrained area.
nsSize mContentArea;
// Our wrapping behavior
PRBool mNoWrap;
// The previous child frames collapsed bottom margin value.
nscoord mPrevBottomMargin;
nsIFrame* mNextRCFrame;
// Is this frame a root for top/bottom margin collapsing?
PRBool mIsTopMarginRoot;
PRBool mIsBottomMarginRoot;
// See ShouldApplyTopMargin
PRBool mApplyTopMargin;
};
// XXX This is vile. Make it go away
void
nsLineLayout::InitFloater(nsPlaceholderFrame* aFrame)
{
mBlockRS->InitFloater(aFrame);
}
void
nsLineLayout::AddFloater(nsPlaceholderFrame* aFrame)
{
mBlockRS->AddFloater(aFrame, PR_FALSE);
}
//----------------------------------------------------------------------
nsBlockReflowState::nsBlockReflowState(const nsHTMLReflowState& aReflowState,
nsIPresContext& aPresContext,
nsBlockFrame* aFrame,
const nsHTMLReflowMetrics& aMetrics,
nsLineLayout* aLineLayout)
: mPresContext(aPresContext),
mReflowState(aReflowState),
mBlock(aFrame),
mPrevBottomMargin(0),
mNextRCFrame(nsnull),
mIsTopMarginRoot(PR_FALSE),
mIsBottomMarginRoot(PR_FALSE),
mApplyTopMargin(PR_FALSE)
{
mLineLayout = aLineLayout;
mSpaceManager = aReflowState.spaceManager;
// Translate into our content area and then save the
// coordinate system origin for later.
const nsMargin& borderPadding = BorderPadding();
mSpaceManager->Translate(borderPadding.left, borderPadding.top);
mSpaceManager->GetTranslation(mSpaceManagerX, mSpaceManagerY);
mReflowStatus = NS_FRAME_COMPLETE;
mPresContext = aPresContext;
mBlock->GetNextInFlow((nsIFrame**)&mNextInFlow);
mKidXMost = 0;
// Compute content area width (the content area is inside the border
// and padding)
mUnconstrainedWidth = PR_FALSE;
if (NS_UNCONSTRAINEDSIZE != aReflowState.computedWidth) {
mContentArea.width = aReflowState.computedWidth;
}
else {
if (NS_UNCONSTRAINEDSIZE == aReflowState.availableWidth) {
mContentArea.width = NS_UNCONSTRAINEDSIZE;
mUnconstrainedWidth = PR_TRUE;
}
else {
nscoord lr = borderPadding.left + borderPadding.right;
mContentArea.width = aReflowState.availableWidth - lr;
}
}
// Compute content area height. Unlike the width, if we have a
// specified style height we ignore it since extra content is
// managed by the "overflow" property. When we don't have a
// specified style height then we may end up limiting our height if
// the availableHeight is constrained (this situation occurs when we
// are paginated).
mUnconstrainedHeight = PR_FALSE;
if (NS_UNCONSTRAINEDSIZE != aReflowState.availableHeight) {
// We are in a paginated situation
mContentArea.height = aReflowState.availableHeight;
}
else {
// When we are not in a paginated situation then we always use
// an constrained height.
mUnconstrainedHeight = PR_TRUE;
mContentArea.height = NS_UNCONSTRAINEDSIZE;
}
#if 0
if (NS_UNCONSTRAINEDSIZE == aReflowState.availableHeight) {
mUnconstrainedHeight = PR_TRUE;
mContentArea.height = aReflowState.availableHeight;
}
else {
// Use constrained height
nscoord tb = borderPadding.top + borderPadding.bottom;
mContentArea.height = aReflowState.availableHeight - tb;
}
#endif
mY = borderPadding.top;
mBottomEdge = mContentArea.height;
mCurrentBand.Init(mSpaceManager, mContentArea);
mPrevChild = nsnull;
mCurrentLine = nsnull;
mPrevLine = nsnull;
const nsStyleText* styleText;
mBlock->GetStyleData(eStyleStruct_Text,
(const nsStyleStruct*&) styleText);
switch (styleText->mWhiteSpace) {
case NS_STYLE_WHITESPACE_PRE:
case NS_STYLE_WHITESPACE_NOWRAP:
mNoWrap = PR_TRUE;
break;
default:
mNoWrap = PR_FALSE;
break;
}
mComputeMaxElementSize = nsnull != aMetrics.maxElementSize;;
mMaxElementSize.SizeTo(0, 0);
if (0 != borderPadding.top) {
mIsTopMarginRoot = PR_TRUE;
}
if (0 != borderPadding.bottom) {
mIsBottomMarginRoot = PR_TRUE;
}
}
nsBlockReflowState::~nsBlockReflowState()
{
// Restore the coordinate system
const nsMargin& borderPadding = BorderPadding();
mSpaceManager->Translate(-borderPadding.left, -borderPadding.top);
}
// Get the available reflow space for the current y coordinate. The
// available space is relative to our coordinate system (0,0) is our
// upper left corner.
void
nsBlockReflowState::GetAvailableSpace()
{
#ifdef NS_DEBUG
// Verify that the caller setup the coordinate system properly
nscoord wx, wy;
mSpaceManager->GetTranslation(wx, wy);
NS_ASSERTION((wx == mSpaceManagerX) && (wy == mSpaceManagerY),
"bad coord system");
#endif
mCurrentBand.GetAvailableSpace(mY - BorderPadding().top, mAvailSpaceRect);
#ifdef NOISY_INCREMENTAL_REFLOW
if (mReflowState.reason == eReflowReason_Incremental) {
nsFrame::IndentBy(stdout, gNoiseIndent);
printf("GetAvailableSpace: band=%d,%d,%d,%d count=%d\n",
mAvailSpaceRect.x, mAvailSpaceRect.y,
mAvailSpaceRect.width, mAvailSpaceRect.height,
mCurrentBand.GetTrapezoidCount());
}
#endif
}
//----------------------------------------------------------------------
const nsIID kBlockFrameCID = NS_BLOCK_FRAME_CID;
nsresult
NS_NewBlockFrame(nsIFrame*& aNewFrame, PRUint32 aFlags)
{
nsBlockFrame* it = new nsBlockFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
it->SetFlags(aFlags);
aNewFrame = it;
return NS_OK;
}
nsBlockFrame::nsBlockFrame()
{
}
nsBlockFrame::~nsBlockFrame()
{
NS_IF_RELEASE(mFirstLineStyle);
NS_IF_RELEASE(mFirstLetterStyle);
nsTextRun::DeleteTextRuns(mTextRuns);
}
NS_IMETHODIMP
nsBlockFrame::DeleteFrame(nsIPresContext& aPresContext)
{
// Outside bullets are not in our child-list so check for them here
// and delete them when present.
if (HaveOutsideBullet()) {
mBullet->DeleteFrame(aPresContext);
mBullet = nsnull;
}
nsLineBox::DeleteLineList(aPresContext, mLines);
nsLineBox::DeleteLineList(aPresContext, mOverflowLines);
mFloaters.DeleteFrames(aPresContext);
return nsBlockFrameSuper::DeleteFrame(aPresContext);
}
NS_IMETHODIMP
nsBlockFrame::QueryInterface(const nsIID& aIID, void** aInstancePtr)
{
if (NULL == aInstancePtr) {
return NS_ERROR_NULL_POINTER;
}
if (aIID.Equals(kBlockFrameCID)) {
nsBlockFrame* tmp = this;
*aInstancePtr = (void*) tmp;
return NS_OK;
}
return nsBlockFrameSuper::QueryInterface(aIID, aInstancePtr);
}
static nsresult
ReResolveLineList(nsIPresContext* aPresContext,
nsLineBox* aLine,
nsIStyleContext* aStyleContext,
PRInt32 aParentChange,
nsStyleChangeList* aChangeList)
{
nsresult rv = NS_OK;
PRInt32 childChange;
while (nsnull != aLine) {
nsIFrame* child = aLine->mFirstChild;
PRInt32 n = aLine->mChildCount;
while ((--n >= 0) && NS_SUCCEEDED(rv)) {
rv = child->ReResolveStyleContext(aPresContext, aStyleContext,
aParentChange, aChangeList, &childChange);
child->GetNextSibling(&child);
}
aLine = aLine->mNext;
}
return rv;
}
NS_IMETHODIMP
nsBlockFrame::ReResolveStyleContext(nsIPresContext* aPresContext,
nsIStyleContext* aParentContext,
PRInt32 aParentChange,
nsStyleChangeList* aChangeList,
PRInt32* aLocalChange)
{
// NOTE: using nsFrame's ReResolveStyleContext method to avoid
// useless version in base classes.
PRInt32 ourChange = aParentChange;
nsresult rv = nsFrame::ReResolveStyleContext(aPresContext, aParentContext,
ourChange, aChangeList, &ourChange);
if (NS_FAILED(rv)) {
return rv;
}
if (NS_COMFALSE != rv) {
// Re-resolve the :first-line pseudo style context
if (nsnull == mPrevInFlow) {
nsIStyleContext* newFirstLineStyle;
aPresContext->ProbePseudoStyleContextFor(mContent,
nsHTMLAtoms::firstLinePseudo,
mStyleContext,
PR_FALSE,
&newFirstLineStyle);
if (newFirstLineStyle != mFirstLineStyle) {
CaptureStyleChangeFor(this, mFirstLineStyle, newFirstLineStyle,
ourChange, aChangeList, &ourChange);
NS_IF_RELEASE(mFirstLineStyle);
mFirstLineStyle = newFirstLineStyle;
}
else {
NS_IF_RELEASE(newFirstLineStyle);
}
// Re-resolve the :first-letter pseudo style context
nsIStyleContext* newFirstLetterStyle;
aPresContext->ProbePseudoStyleContextFor(mContent,
nsHTMLAtoms::firstLetterPseudo,
(nsnull != mFirstLineStyle
? mFirstLineStyle
: mStyleContext),
PR_FALSE,
&newFirstLetterStyle);
if (newFirstLetterStyle != mFirstLetterStyle) {
CaptureStyleChangeFor(this, mFirstLetterStyle, newFirstLetterStyle,
ourChange, aChangeList, &ourChange);
NS_IF_RELEASE(mFirstLetterStyle);
mFirstLetterStyle = newFirstLetterStyle;
}
else {
NS_IF_RELEASE(newFirstLetterStyle);
}
}
// XXX Need to check if the bullet is inside and hence
// in the line list. If so, we don't need to do this.
if (NS_SUCCEEDED(rv) && (nsnull != mBullet)) {
nsIStyleContext* newBulletSC;
nsIStyleContext* oldBulletSC = nsnull;
mBullet->GetStyleContext(&oldBulletSC);
aPresContext->ResolvePseudoStyleContextFor(mContent,
nsHTMLAtoms::mozListBulletPseudo,
mStyleContext,
PR_FALSE, &newBulletSC);
rv = mBullet->SetStyleContext(aPresContext, newBulletSC);
CaptureStyleChangeFor(this, oldBulletSC, newBulletSC,
ourChange, aChangeList, &ourChange);
NS_RELEASE(oldBulletSC);
NS_RELEASE(newBulletSC);
}
if (aLocalChange) {
*aLocalChange = ourChange;
}
// Update the child frames on each line
nsLineBox* line = mLines;
PRInt32 childChange;
while (nsnull != line) {
nsIFrame* child = line->mFirstChild;
PRInt32 n = line->mChildCount;
while ((--n >= 0) && NS_SUCCEEDED(rv)) {
if (line == mLines) {
rv = child->ReResolveStyleContext(aPresContext,
(nsnull != mFirstLineStyle
? mFirstLineStyle
: mStyleContext),
ourChange,
aChangeList, &childChange);
}
else {
rv = child->ReResolveStyleContext(aPresContext, mStyleContext,
ourChange, aChangeList, &childChange);
}
child->GetNextSibling(&child);
}
line = line->mNext;
}
if (NS_SUCCEEDED(rv) && (nsnull != mOverflowLines)) {
rv = ReResolveLineList(aPresContext, mOverflowLines, mStyleContext,
ourChange, aChangeList);
}
if (NS_SUCCEEDED(rv) && (nsnull != mPrevInFlow)) {
nsLineBox* lines = ((nsBlockFrame*)mPrevInFlow)->mOverflowLines;
if (nsnull != lines) {
rv = ReResolveLineList(aPresContext, lines, mStyleContext,
ourChange, aChangeList);
}
}
}
return rv;
}
NS_IMETHODIMP
nsBlockFrame::IsSplittable(nsSplittableType& aIsSplittable) const
{
aIsSplittable = NS_FRAME_SPLITTABLE_NON_RECTANGULAR;
return NS_OK;
}
static void
ListTextRuns(FILE* out, PRInt32 aIndent, nsTextRun* aRuns)
{
while (nsnull != aRuns) {
aRuns->List(out, aIndent);
aRuns = aRuns->GetNext();
}
}
NS_METHOD
nsBlockFrame::List(FILE* out, PRInt32 aIndent) const
{
IndentBy(out, aIndent);
ListTag(out);
nsIView* view;
GetView(&view);
if (nsnull != view) {
fprintf(out, " [view=%p]", view);
}
// Output the flow linkage
if (nsnull != mPrevInFlow) {
fprintf(out, " prev-in-flow=%p", mPrevInFlow);
}
if (nsnull != mNextInFlow) {
fprintf(out, " next-in-flow=%p", mNextInFlow);
}
// 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=%08x]", mState);
}
if (0 != mFlags) {
fprintf(out, " [flags=%x]", mFlags);
}
fputs("<\n", out);
aIndent++;
// Output the lines
if (nsnull != mLines) {
nsLineBox* line = mLines;
while (nsnull != line) {
line->List(out, aIndent);
line = line->mNext;
}
}
nsIAtom* listName = nsnull;
PRInt32 listIndex = 0;
for (;;) {
nsIFrame* kid;
GetAdditionalChildListName(listIndex++, &listName);
if (nsnull == listName) {
break;
}
FirstChild(listName, &kid);
if (nsnull != kid) {
IndentBy(out, aIndent);
nsAutoString tmp;
if (nsnull != listName) {
listName->ToString(tmp);
fputs(tmp, out);
}
fputs("<\n", out);
while (nsnull != kid) {
kid->List(out, aIndent + 1);
kid->GetNextSibling(&kid);
}
IndentBy(out, aIndent);
fputs(">\n", out);
}
NS_IF_RELEASE(listName);
}
// Output the text-runs
if (nsnull != mTextRuns) {
IndentBy(out, aIndent);
fputs("text-runs <\n", out);
ListTextRuns(out, aIndent + 1, mTextRuns);
IndentBy(out, aIndent);
fputs(">\n", out);
}
aIndent--;
IndentBy(out, aIndent);
fputs(">\n", out);
return NS_OK;
}
NS_IMETHODIMP
nsBlockFrame::GetFrameName(nsString& aResult) const
{
return MakeFrameName("Block", aResult);
}
NS_IMETHODIMP
nsBlockFrame::GetFrameType(nsIAtom** aType) const
{
NS_PRECONDITION(nsnull != aType, "null OUT parameter pointer");
*aType = nsHTMLAtoms::blockFrame;
NS_ADDREF(*aType);
return NS_OK;
}
/////////////////////////////////////////////////////////////////////////////
// Child frame enumeration
NS_IMETHODIMP
nsBlockFrame::FirstChild(nsIAtom* aListName, nsIFrame** aFirstChild) const
{
NS_PRECONDITION(nsnull != aFirstChild, "null OUT parameter pointer");
if (nsnull == aListName) {
*aFirstChild = (nsnull != mLines) ? mLines->mFirstChild : nsnull;
return NS_OK;
}
else if (aListName == nsLayoutAtoms::floaterList) {
*aFirstChild = mFloaters.FirstChild();
return NS_OK;
}
else if (aListName == nsLayoutAtoms::bulletList) {
*aFirstChild = mBullet;
return NS_OK;
}
*aFirstChild = nsnull;
return NS_ERROR_INVALID_ARG;
}
NS_IMETHODIMP
nsBlockFrame::GetAdditionalChildListName(PRInt32 aIndex,
nsIAtom** aListName) const
{
NS_PRECONDITION(nsnull != aListName, "null OUT parameter pointer");
if (aIndex < 0) {
return NS_ERROR_INVALID_ARG;
}
*aListName = nsnull;
switch (aIndex) {
case NS_BLOCK_FRAME_FLOATER_LIST_INDEX:
*aListName = nsLayoutAtoms::floaterList;
NS_ADDREF(*aListName);
break;
case NS_BLOCK_FRAME_BULLET_LIST_INDEX:
*aListName = nsLayoutAtoms::bulletList;
NS_ADDREF(*aListName);
break;
}
return NS_OK;
}
NS_IMETHODIMP
nsBlockFrame::IsPercentageBase(PRBool& aBase) const
{
aBase = PR_TRUE;
return NS_OK;
}
//////////////////////////////////////////////////////////////////////
// Frame structure methods
//////////////////////////////////////////////////////////////////////
// Reflow methods
NS_IMETHODIMP
nsBlockFrame::Reflow(nsIPresContext& aPresContext,
nsHTMLReflowMetrics& aMetrics,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
nsLineLayout lineLayout(aPresContext, aReflowState.spaceManager,
&aReflowState, nsnull != aMetrics.maxElementSize);
nsBlockReflowState state(aReflowState, aPresContext, this, aMetrics,
&lineLayout);
lineLayout.Init(&state);
if (NS_BLOCK_MARGIN_ROOT & mFlags) {
state.mIsTopMarginRoot = PR_TRUE;
state.mIsBottomMarginRoot = PR_TRUE;
}
if (state.mIsTopMarginRoot) {
state.mApplyTopMargin = PR_TRUE;
}
if (eReflowReason_Resize != aReflowState.reason) {
RenumberLists();
ComputeTextRuns(aPresContext);
}
nsresult rv = NS_OK;
nsIFrame* target;
switch (aReflowState.reason) {
case eReflowReason_Initial:
DrainOverflowLines();
rv = PrepareInitialReflow(state);
mState &= ~NS_FRAME_FIRST_REFLOW;
break;
case eReflowReason_Incremental:
aReflowState.reflowCommand->GetTarget(target);
if (this == target) {
nsIReflowCommand::ReflowType type;
aReflowState.reflowCommand->GetType(type);
switch (type) {
case nsIReflowCommand::FrameAppended:
case nsIReflowCommand::FrameInserted:
case nsIReflowCommand::FrameRemoved:
break;
case nsIReflowCommand::StyleChanged:
rv = PrepareStyleChangedReflow(state);
break;
case nsIReflowCommand::ReflowDirty:
break;
default:
// Map any other incremental operations into full reflows
rv = PrepareResizeReflow(state);
break;
}
}
else {
// Get next frame in reflow command chain
aReflowState.reflowCommand->GetNext(state.mNextRCFrame);
// Now do the reflow
rv = PrepareChildIncrementalReflow(state);
}
break;
case eReflowReason_Resize:
default:
DrainOverflowLines();
rv = PrepareResizeReflow(state);
break;
}
// Now reflow...
rv = ReflowDirtyLines(state);
aStatus = state.mReflowStatus;
if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
if (NS_STYLE_OVERFLOW_HIDDEN == aReflowState.mStyleDisplay->mOverflow) {
aStatus = NS_FRAME_COMPLETE;
}
else {
#ifdef DEBUG_kipp
ListTag(stdout); printf(": block is not complete\n");
#endif
}
}
// XXX get rid of this!
BuildFloaterList();
// Compute our final size
ComputeFinalSize(aReflowState, state, aMetrics);
#ifdef NOISY_FINAL_SIZE
ListTag(stdout);
printf(": availSize=%d,%d computed=%d,%d metrics=%d,%d carriedMargin=%d\n",
aReflowState.availableWidth, aReflowState.availableHeight,
aReflowState.computedWidth, aReflowState.computedHeight,
aMetrics.width, aMetrics.height,
aMetrics.mCarriedOutBottomMargin);
#endif
return rv;
}
void
nsBlockFrame::ComputeFinalSize(const nsHTMLReflowState& aReflowState,
nsBlockReflowState& aState,
nsHTMLReflowMetrics& aMetrics)
{
const nsMargin& borderPadding = aState.BorderPadding();
// Special check for zero sized content: If our content is zero
// sized then we collapse into nothingness.
//
// Consensus after discussion with a few CSS folks is that html's
// notion of collapsing <P>'s should take precedence over non
// auto-sided block elements. Therefore we don't honor the width,
// height, border or padding attributes (the parent has to not apply
// a margin for us also).
//
// Note that this is <b>only</b> done for html paragraphs. Its not
// appropriate to apply it to other containers, especially XML
// content!
PRBool isHTMLParagraph = 0 != (mState & NS_BLOCK_IS_HTML_PARAGRAPH);
if (isHTMLParagraph &&
(aReflowState.mStyleDisplay->mDisplay == NS_STYLE_DISPLAY_BLOCK) &&
(((0 == aState.mKidXMost) ||
(0 == aState.mKidXMost - borderPadding.left)) &&
(0 == aState.mY - borderPadding.top))) {
// Zero out the works
aMetrics.width = 0;
aMetrics.height = 0;
aMetrics.ascent = 0;
aMetrics.descent = 0;
aMetrics.mCarriedOutBottomMargin = 0;
if (nsnull != aMetrics.maxElementSize) {
aMetrics.maxElementSize->width = 0;
aMetrics.maxElementSize->height = 0;
}
}
else {
// Compute final width
nscoord maxWidth = 0, maxHeight = 0;
nscoord minWidth = aState.mKidXMost + borderPadding.right;
if (!aState.mUnconstrainedWidth && aReflowState.HaveFixedContentWidth()) {
// Use style defined width
aMetrics.width = borderPadding.left + aReflowState.computedWidth +
borderPadding.right;
// XXX quote css1 section here
if ((0 == aReflowState.computedWidth) && (aMetrics.width < minWidth)) {
aMetrics.width = minWidth;
}
// When style defines the width use it for the max-element-size
// because we can't shrink any smaller.
maxWidth = aMetrics.width;
}
else {
nscoord computedWidth = minWidth;
PRBool compact = PR_FALSE;
#if 0
if (NS_STYLE_DISPLAY_COMPACT == aReflowState.mStyleDisplay->mDisplay) {
// If we are display: compact AND we have no lines or we have
// exactly one line and that line is not a block line AND that
// line doesn't end in a BR of any sort THEN we remain a compact
// frame.
if ((nsnull == mLines) ||
((nsnull == mLines->mNext) && !mLines->IsBlock() &&
(NS_STYLE_CLEAR_NONE == mLines->mBreakType)
/*XXX && (computedWidth <= aState.mCompactMarginWidth) */
)) {
compact = PR_TRUE;
}
}
#endif
// There are two options here. We either shrink wrap around our
// contents or we fluff out to the maximum block width. Note:
// We always shrink wrap when given an unconstrained width.
if ((0 == (NS_BLOCK_SHRINK_WRAP & mFlags)) &&
!aState.mUnconstrainedWidth &&
!compact) {
// Set our width to the max width if we aren't already that
// wide. Note that the max-width has nothing to do with our
// contents (CSS2 section XXX)
nscoord maxWidth = borderPadding.left + aState.mContentArea.width +
borderPadding.right;
computedWidth = maxWidth;
}
else if (aState.mComputeMaxElementSize) {
if (aState.mNoWrap) {
// When no-wrap is true the max-element-size.width is the
// width of the widest line plus the right border. Note that
// aState.mKidXMost already has the left border factored in
maxWidth = aState.mKidXMost + borderPadding.right;
}
else {
// Add in border and padding dimensions to already computed
// max-element-size values.
maxWidth = aState.mMaxElementSize.width +
borderPadding.left + borderPadding.right;
}
// See if our max-element-size width is larger than our
// computed-width. This happens when we are impacted by a
// floater. When this does happen, our desired size needs to
// include room for the floater.
if (computedWidth < maxWidth) {
#ifdef DEBUG_kipp
ListTag(stdout);
printf(": adjusting width from %d to %d\n", computedWidth,
maxWidth);
#endif
computedWidth = maxWidth;
}
}
// Apply min/max values
if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMaxWidth) {
nscoord computedMaxWidth = aReflowState.mComputedMaxWidth +
borderPadding.left + borderPadding.right;
if (computedWidth > computedMaxWidth) {
computedWidth = aReflowState.mComputedMaxWidth;
}
}
if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMinWidth) {
nscoord computedMinWidth = aReflowState.mComputedMinWidth +
borderPadding.left + borderPadding.right;
if (computedWidth < computedMinWidth) {
computedWidth = computedMinWidth;
}
}
aMetrics.width = computedWidth;
}
// Compute final height
if (NS_UNCONSTRAINEDSIZE != aReflowState.computedHeight) {
// Use style defined height
aMetrics.height = borderPadding.top + aReflowState.computedHeight +
borderPadding.bottom;
// When style defines the height use it for the max-element-size
// because we can't shrink any smaller.
maxHeight = aMetrics.height;
}
else {
nscoord autoHeight = aState.mY;
// Shrink wrap our height around our contents.
if (aState.mIsBottomMarginRoot) {
// When we are a bottom-margin root make sure that our last
// childs bottom margin is fully applied.
// XXX check for a fit
autoHeight += aState.mPrevBottomMargin;
}
autoHeight += borderPadding.bottom;
// Apply min/max values
if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMaxHeight) {
nscoord computedMaxHeight = aReflowState.mComputedMaxHeight +
borderPadding.top + borderPadding.bottom;
if (autoHeight > computedMaxHeight) {
autoHeight = computedMaxHeight;
}
}
if (NS_UNCONSTRAINEDSIZE != aReflowState.mComputedMinHeight) {
nscoord computedMinHeight = aReflowState.mComputedMinHeight +
borderPadding.top + borderPadding.bottom;
if (autoHeight < computedMinHeight) {
autoHeight = computedMinHeight;
}
}
aMetrics.height = autoHeight;
if (aState.mComputeMaxElementSize) {
maxHeight = aState.mMaxElementSize.height +
borderPadding.top + borderPadding.bottom;
}
}
aMetrics.ascent = aMetrics.height;
aMetrics.descent = 0;
if (aState.mComputeMaxElementSize) {
// Store away the final value
aMetrics.maxElementSize->width = maxWidth;
aMetrics.maxElementSize->height = maxHeight;
}
// Return bottom margin information
aMetrics.mCarriedOutBottomMargin =
aState.mIsBottomMarginRoot ? 0 : aState.mPrevBottomMargin;
#ifdef DEBUG
if (CRAZY_WIDTH(aMetrics.width) || CRAZY_HEIGHT(aMetrics.height)) {
ListTag(stdout);
printf(": WARNING: desired:%d,%d\n", aMetrics.width, aMetrics.height);
}
if (aState.mComputeMaxElementSize &&
((maxWidth > aMetrics.width) || (maxHeight > aMetrics.height))) {
ListTag(stdout);
printf(": WARNING: max-element-size:%d,%d desired:%d,%d maxSize:%d,%d\n",
maxWidth, maxHeight, aMetrics.width, aMetrics.height,
aState.mReflowState.availableWidth,
aState.mReflowState.availableHeight);
}
#endif
#ifdef NOISY_MAX_ELEMENT_SIZE
if (aState.mComputeMaxElementSize) {
IndentBy(stdout, GetDepth());
if (NS_UNCONSTRAINEDSIZE == aState.mReflowState.availableWidth) {
printf("PASS1 ");
}
ListTag(stdout);
printf(": max-element-size:%d,%d desired:%d,%d maxSize:%d,%d\n",
maxWidth, maxHeight, aMetrics.width, aMetrics.height,
aState.mReflowState.availableWidth,
aState.mReflowState.availableHeight);
}
#endif
}
// Compute the combined area of our children
// XXX take into account the overflow->clip property!
nscoord x0 = 0, y0 = 0, x1 = aMetrics.width, y1 = aMetrics.height;
nsLineBox* line = mLines;
while (nsnull != line) {
// Compute min and max x/y values for the reflowed frame's
// combined areas
nscoord x = line->mCombinedArea.x;
nscoord y = line->mCombinedArea.y;
nscoord xmost = x + line->mCombinedArea.width;
nscoord ymost = y + line->mCombinedArea.height;
if (x < x0) {
x0 = x;
}
if (xmost > x1) {
x1 = xmost;
}
if (y < y0) {
y0 = y;
}
if (ymost > y1) {
y1 = ymost;
}
line = line->mNext;
}
#ifdef NOISY_COMBINED_AREA
IndentBy(stdout, GetDepth());
ListTag(stdout);
printf(": ca=%d,%d,%d,%d\n", x0, y0, x1-x0, y1-y0);
#endif
// If the combined area of our children exceeds our bounding box
// then set the NS_FRAME_OUTSIDE_CHILDREN flag, otherwise clear it.
aMetrics.mCombinedArea.x = x0;
aMetrics.mCombinedArea.y = y0;
aMetrics.mCombinedArea.width = x1 - x0;
aMetrics.mCombinedArea.height = y1 - y0;
if ((aMetrics.mCombinedArea.x < 0) ||
(aMetrics.mCombinedArea.y < 0) ||
(aMetrics.mCombinedArea.XMost() > aMetrics.width) ||
(aMetrics.mCombinedArea.YMost() > aMetrics.height)) {
mState |= NS_FRAME_OUTSIDE_CHILDREN;
}
else {
mState &= ~NS_FRAME_OUTSIDE_CHILDREN;
}
}
nsresult
nsBlockFrame::PrepareInitialReflow(nsBlockReflowState& aState)
{
PrepareResizeReflow(aState);
return NS_OK;
}
nsresult
nsBlockFrame::PrepareChildIncrementalReflow(nsBlockReflowState& aState)
{
// If by chance we are inside a table, then give up and reflow
// everything because we don't cache max-element-size information in
// the lines.
if (aState.mComputeMaxElementSize) {
return PrepareResizeReflow(aState);
}
// Determine the line being impacted
PRBool isFloater;
nsLineBox* line = FindLineFor(aState.mNextRCFrame, isFloater);
if (nsnull == line) {
// This can't happen, but just in case it does...
return PrepareResizeReflow(aState);
}
// XXX: temporary: If the child frame is a floater then punt
if (isFloater) {
return PrepareResizeReflow(aState);
}
// XXX need code for run-in/compact
// Mark (at least) the affected line dirty.
line->MarkDirty();
if (aState.mNoWrap || line->IsBlock()) {
// If we aren't wrapping then we know for certain that any changes
// to a childs reflow can't affect the line that follows. This is
// also true if the line is a block line.
}
else {
// XXX: temporary: For now we are conservative and mark this line
// and any inline lines that follow it dirty.
line = line->mNext;
while (nsnull != line) {
if (line->IsBlock()) {
break;
}
line->MarkDirty();
line = line->mNext;
}
}
return NS_OK;
}
void
nsBlockFrame::UpdateBulletPosition()
{
if (nsnull == mBullet) {
// Don't bother if there is no bullet
return;
}
const nsStyleList* styleList;
GetStyleData(eStyleStruct_List, (const nsStyleStruct*&) styleList);
if (NS_STYLE_LIST_STYLE_POSITION_INSIDE == styleList->mListStylePosition) {
if (HaveOutsideBullet()) {
// We now have an inside bullet, but used to have an outside
// bullet. Adjust the frame lists and mark the first line
// dirty.
if (nsnull != mLines) {
mBullet->SetNextSibling(mLines->mFirstChild);
mLines->mFirstChild = mBullet;
mLines->mChildCount++;
mLines->MarkDirty();
}
}
mState &= ~NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET;
}
else {
if (!HaveOutsideBullet()) {
// We now have an outside bullet, but used to have an inside
// bullet. Take the bullet frame out of the first lines frame
// list.
if ((nsnull != mLines) && (mBullet == mLines->mFirstChild)) {
nsIFrame* next;
mBullet->GetNextSibling(&next);
mBullet->SetNextSibling(nsnull);
if (--mLines->mChildCount == 0) {
nsLineBox* nextLine = mLines->mNext;
delete mLines;
mLines = nextLine;
if (nsnull != nextLine) {
nextLine->MarkDirty();
}
}
else {
mLines->mFirstChild = next;
mLines->MarkDirty();
}
}
}
mState |= NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET;
}
#ifdef DEBUG
VerifyFrameCount(mLines);
#endif
}
nsresult
nsBlockFrame::PrepareStyleChangedReflow(nsBlockReflowState& aState)
{
UpdateBulletPosition();
// XXX temporary
return PrepareResizeReflow(aState);
}
nsresult
nsBlockFrame::PrepareResizeReflow(nsBlockReflowState& aState)
{
// Mark everything dirty
nsLineBox* line = mLines;
while (nsnull != line) {
line->MarkDirty();
line = line->mNext;
}
return NS_OK;
}
//----------------------------------------
nsLineBox*
nsBlockFrame::FindLineFor(nsIFrame* aFrame, PRBool& aIsFloaterResult)
{
aIsFloaterResult = PR_FALSE;
nsLineBox* line = mLines;
while (nsnull != line) {
if (line->Contains(aFrame)) {
return line;
}
if (nsnull != line->mFloaters) {
nsVoidArray& a = *line->mFloaters;
PRInt32 i, n = a.Count();
for (i = 0; i < n; i++) {
nsPlaceholderFrame* ph = (nsPlaceholderFrame*) a[i];
if (aFrame == ph->GetAnchoredItem()) {
aIsFloaterResult = PR_TRUE;
return line;
}
}
}
line = line->mNext;
}
return line;
}
nsresult
nsBlockFrame::RecoverStateFrom(nsBlockReflowState& aState,
nsLineBox* aLine,
nscoord aDeltaY)
{
aState.mCurrentLine = aLine;
// Recover xmost
nscoord xmost = aLine->mBounds.XMost();
if (xmost > aState.mKidXMost) {
#ifdef DEBUG
if (CRAZY_WIDTH(xmost)) {
ListTag(stdout);
printf(": WARNING: xmost:%d\n", xmost);
}
#endif
aState.mKidXMost = xmost;
}
// Recover the natural (un-collapsed margins) for the child
//XXX nsMargin childMargins(0, 0, 0, 0);
if (aLine->IsBlock()) {
nsIFrame* frame = aLine->mFirstChild;
const nsStyleSpacing* spacing;
frame->GetStyleData(eStyleStruct_Spacing, (const nsStyleStruct*&)spacing);
// XXX use a reflow-state to do the necessary computations for blocks
// XXX_fix_me
}
aState.mPrevBottomMargin = 0;
#if XXX_fix_me
// Recompute running margin value (aState.mPrevBottomMargin). Also
// recover the aState.carriedOutTopMargin, when appropriate.
nscoord topMargin, bottomMargin;
nsBlockReflowContext::CollapseMargins(childMargins,
aLine->GetCarriedOutTopMargin(),
aLine->GetCarriedOutBottomMargin(),
aLine->GetHeight(),
aState.mPrevBottomMargin,
topMargin, bottomMargin);
aState.mPrevBottomMargin = bottomMargin;
if (!ShouldApplyTopMargin(aState, aLine)) {
aState.mCarriedOutTopMargin = topMargin;
}
if (0 != aDeltaY) {
// Move this lines frames by the current delta value
SlideFrames(aState.mPresContext, aState.mSpaceManager, aLine, aDeltaY);
SlideFloaters(aState.mPresContext, aState.mSpaceManager, aLine, aDeltaY,
PR_FALSE);
}
#endif
if (nsnull != aLine->mFloaters) {
aState.mY = aLine->mBounds.y;
aState.PlaceCurrentLineFloaters(aLine->mFloaters);
aState.mY = aLine->mBounds.YMost();
aState.PlaceBelowCurrentLineFloaters(aLine->mFloaters, PR_FALSE);
}
// Advance Y to be below the line.
aState.mY = aLine->mBounds.YMost();
// XXX_fix_me: if the line has clear-before semantics then figure out
// if we need to do anything here or not!
// Apply any clear before/after semantics the line might have
if (!aLine->IsBlock() && (NS_STYLE_CLEAR_NONE != aLine->mBreakType)) {
// Apply clear
switch (aLine->mBreakType) {
case NS_STYLE_CLEAR_LEFT:
case NS_STYLE_CLEAR_RIGHT:
case NS_STYLE_CLEAR_LEFT_AND_RIGHT:
// XXX_fix_me is this the right y value to use? or should we use
// the previous aState.mY?
aState.ClearFloaters(aState.mY, aLine->mBreakType);
break;
}
}
return NS_OK;
}
/**
* Propogate reflow "damage" from the just reflowed line (aLine) to
* any subsequent lines that were affected. The only thing that causes
* damage is a change to the impact that floaters make.
*/
void
nsBlockFrame::PropogateReflowDamage(nsBlockReflowState& aState,
nsLineBox* aLine,
nscoord aDeltaY)
{
if (aLine->mCombinedArea.YMost() > aLine->mBounds.YMost()) {
// The line has an object that extends outside of its bounding box.
nscoord impactY0 = aLine->mCombinedArea.y;
nscoord impactY1 = aLine->mCombinedArea.YMost();
#ifdef NOISY_INCREMENTAL_REFLOW
if (aState.mReflowState.reason == eReflowReason_Incremental) {
IndentBy(stdout, gNoiseIndent);
printf("impactY0=%d impactY1=%d deltaY=%d\n",
impactY0, impactY1, aDeltaY);
}
#endif
// XXX Because we don't know what it is (it might be a floater; it
// might be something that is just relatively positioned) we
// *assume* that it's a floater and that lines that follow will
// need reflowing.
// Note: we cannot stop after the first non-intersecting line
// because lines might be overlapping because of negative margins.
nsLineBox* next = aLine->mNext;
while (nsnull != next) {
nscoord lineY0 = next->mBounds.y + aDeltaY;
nscoord lineY1 = lineY0 + next->mBounds.height;
if ((lineY0 < impactY1) && (impactY0 < lineY1)) {
#ifdef NOISY_INCREMENTAL_REFLOW
if (aState.mReflowState.reason == eReflowReason_Incremental) {
IndentBy(stdout, gNoiseIndent);
printf("line=%p setting dirty\n", next);
}
#endif
next->MarkDirty();
}
next = next->mNext;
}
}
}
/**
* Reflow the dirty lines
*/
nsresult
nsBlockFrame::ReflowDirtyLines(nsBlockReflowState& aState)
{
nsresult rv = NS_OK;
PRBool keepGoing = PR_TRUE;
// Inform line layout of where the text runs are
aState.mLineLayout->SetReflowTextRuns(mTextRuns);
#ifdef NOISY_INCREMENTAL_REFLOW
if (aState.mReflowState.reason == eReflowReason_Incremental) {
nsIReflowCommand::ReflowType type;
aState.mReflowState.reflowCommand->GetType(type);
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": incrementally reflowing dirty lines: type=%s(%d)\n",
kReflowCommandType[type], type);
gNoiseIndent++;
}
#endif
// Reflow the lines that are already ours
aState.mPrevLine = nsnull;
nsLineBox* line = mLines;
nscoord deltaY = 0;
while (nsnull != line) {
#ifdef NOISY_INCREMENTAL_REFLOW
if (aState.mReflowState.reason == eReflowReason_Incremental) {
IndentBy(stdout, gNoiseIndent);
printf("line=%p mY=%d dirty=%s oldBounds=%d,%d,%d,%d deltaY=%d\n",
line, aState.mY, line->IsDirty() ? "yes" : "no",
line->mBounds.x, line->mBounds.y,
line->mBounds.width, line->mBounds.height,
deltaY);
gNoiseIndent++;
}
#endif
if (line->IsDirty()) {
// Compute the dirty lines "before" YMost, after factoring in
// the running deltaY value - the running value is implicit in
// aState.mY.
nscoord oldHeight = line->mBounds.height;
// Reflow the dirty line
rv = ReflowLine(aState, line, &keepGoing);
if (NS_FAILED(rv)) {
return rv;
}
DidReflowLine(aState, line, keepGoing);
if (!keepGoing) {
if (0 == line->ChildCount()) {
DeleteLine(aState, line);
}
break;
}
nscoord newHeight = line->mBounds.height;
deltaY += newHeight - oldHeight;
// If the next line is clean then check and see if reflowing the
// current line "damaged" the next line. Damage occurs when the
// current line contains floaters that intrude upon the
// subsequent lines.
nsLineBox* next = line->mNext;
if ((nsnull != next) && !next->IsDirty()) {
PropogateReflowDamage(aState, line, deltaY);
}
}
else {
// XXX what if the slid line doesn't fit because we are in a
// vertically constrained situation?
// Recover state as if we reflowed this line
RecoverStateFrom(aState, line, deltaY);
}
#ifdef NOISY_INCREMENTAL_REFLOW
if (aState.mReflowState.reason == eReflowReason_Incremental) {
gNoiseIndent--;
IndentBy(stdout, gNoiseIndent);
printf("line=%p mY=%d newBounds=%d,%d,%d,%d deltaY=%d\n",
line, aState.mY,
line->mBounds.x, line->mBounds.y,
line->mBounds.width, line->mBounds.height,
deltaY);
}
#endif
// If this is an inline frame then its time to stop
aState.mPrevLine = line;
line = line->mNext;
aState.mLineLayout->AdvanceToNextLine();
}
// Pull data from a next-in-flow if we can
while (keepGoing && (nsnull != aState.mNextInFlow)) {
// Grab first line from our next-in-flow
line = aState.mNextInFlow->mLines;
if (nsnull == line) {
aState.mNextInFlow = (nsBlockFrame*) aState.mNextInFlow->mNextInFlow;
continue;
}
// XXX See if the line is not dirty; if it's not maybe we can
// avoid the pullup if it can't fit?
aState.mNextInFlow->mLines = line->mNext;
line->mNext = nsnull;
if (0 == line->ChildCount()) {
// The line is empty. Try the next one.
NS_ASSERTION(nsnull == line->mFirstChild, "bad empty line");
delete line;
continue;
}
// XXX move to a subroutine: run-in, overflow, pullframe and this do this
// Make the children in the line ours.
nsIFrame* frame = line->mFirstChild;
nsIFrame* lastFrame = nsnull;
PRInt32 n = line->ChildCount();
while (--n >= 0) {
frame->SetParent(this);
lastFrame = frame;
frame->GetNextSibling(&frame);
}
lastFrame->SetNextSibling(nsnull);
// Add line to our line list
if (nsnull == aState.mPrevLine) {
NS_ASSERTION(nsnull == mLines, "bad aState.mPrevLine");
mLines = line;
}
else {
NS_ASSERTION(nsnull == aState.mPrevLine->mNext, "bad aState.mPrevLine");
aState.mPrevLine->mNext = line;
aState.mPrevChild->SetNextSibling(line->mFirstChild);
}
// Now reflow it and any lines that it makes during it's reflow
// (we have to loop here because reflowing the line may case a new
// line to be created; see SplitLine's callers for examples of
// when this happens).
while (nsnull != line) {
rv = ReflowLine(aState, line, &keepGoing);
if (NS_FAILED(rv)) {
return rv;
}
DidReflowLine(aState, line, keepGoing);
if (!keepGoing) {
if (0 == line->ChildCount()) {
DeleteLine(aState, line);
}
break;
}
// If this is an inline frame then its time to stop
aState.mPrevLine = line;
line = line->mNext;
aState.mLineLayout->AdvanceToNextLine();
}
}
#ifdef NOISY_INCREMENTAL_REFLOW
if (aState.mReflowState.reason == eReflowReason_Incremental) {
gNoiseIndent--;
IndentBy(stdout, gNoiseIndent);
ListTag(stdout);
printf(": done reflowing dirty lines (status=%x)\n",
aState.mReflowStatus);
}
#endif
return rv;
}
void
nsBlockFrame::DeleteLine(nsBlockReflowState& aState,
nsLineBox* aLine)
{
NS_PRECONDITION(0 == aLine->ChildCount(), "can't delete !empty line");
if (0 == aLine->ChildCount()) {
if (nsnull == aState.mPrevLine) {
NS_ASSERTION(aLine == mLines, "huh");
mLines = nsnull;
}
else {
NS_ASSERTION(aState.mPrevLine->mNext == aLine, "bad prev-line");
aState.mPrevLine->mNext = aLine->mNext;
}
delete aLine;
}
}
void
nsBlockFrame::WillReflowLine(nsBlockReflowState& aState,
nsLineBox* aLine)
{
// Setup the first-letter-style-ok flag
nsLineLayout& lineLayout = *aState.mLineLayout;
if (mFirstLetterStyle && (0 == lineLayout.GetLineNumber())) {
lineLayout.SetFirstLetterStyleOK(PR_TRUE);
}
else {
lineLayout.SetFirstLetterStyleOK(PR_FALSE);
}
}
/**
* Reflow a line. The line will either contain a single block frame
* or contain 1 or more inline frames. aLineReflowStatus indicates
* whether or not the caller should continue to reflow more lines.
*/
nsresult
nsBlockFrame::ReflowLine(nsBlockReflowState& aState,
nsLineBox* aLine,
PRBool* aKeepReflowGoing)
{
nsresult rv = NS_OK;
// If the line is empty then first pull a frame into it so that we
// know what kind of line it is (block or inline).
if (0 == aLine->ChildCount()) {
nsIFrame* frame;
rv = PullFrame(aState, aLine, frame);
if (NS_FAILED(rv)) {
return rv;
}
if (nsnull == frame) {
*aKeepReflowGoing = PR_FALSE;
return rv;
}
}
// Setup the line-layout for the new line
aState.mCurrentLine = aLine;
aLine->ClearDirty();
aLine->SetNeedDidReflow();
// Now that we know what kind of line we have, reflow it
if (aLine->IsBlock()) {
NS_ASSERTION(nsnull == aLine->mFloaters, "bad line");
rv = ReflowBlockFrame(aState, aLine, aKeepReflowGoing);
}
else {
rv = ReflowInlineFrames(aState, aLine, aKeepReflowGoing);
}
return rv;
}
/**
* Pull frame from the next available location (one of our lines or
* one of our next-in-flows lines).
*/
nsresult
nsBlockFrame::PullFrame(nsBlockReflowState& aState,
nsLineBox* aLine,
nsIFrame*& aFrameResult)
{
nsresult rv = NS_OK;
PRBool stopPulling;
aFrameResult = nsnull;
// First check our remaining lines
while (nsnull != aLine->mNext) {
rv = PullFrame(aState, aLine, &aLine->mNext, PR_FALSE,
aFrameResult, stopPulling);
if (NS_FAILED(rv) || stopPulling) {
return rv;
}
}
// Pull frames from the next-in-flow(s) until we can't
nsBlockFrame* nextInFlow = aState.mNextInFlow;
while (nsnull != nextInFlow) {
nsLineBox* line = nextInFlow->mLines;
if (nsnull == line) {
nextInFlow = (nsBlockFrame*) nextInFlow->mNextInFlow;
aState.mNextInFlow = nextInFlow;
continue;
}
rv = PullFrame(aState, aLine, &nextInFlow->mLines, PR_TRUE,
aFrameResult, stopPulling);
if (NS_FAILED(rv) || stopPulling) {
return rv;
}
}
return rv;
}
/**
* Try to pull a frame out of a line pointed at by aFromList. If a
* frame is pulled then aPulled will be set to PR_TRUE. In addition,
* if aUpdateGeometricParent is set then the pulled frames geometric
* parent will be updated (e.g. when pulling from a next-in-flows line
* list).
*
* Note: pulling a frame from a line that is a place-holder frame
* doesn't automatically remove the corresponding floater from the
* line's floater array. This happens indirectly: either the line gets
* emptied (and destroyed) or the line gets reflowed (because we mark
* it dirty) and the code at the top of ReflowLine empties the
* array. So eventually, it will be removed, just not right away.
*/
nsresult
nsBlockFrame::PullFrame(nsBlockReflowState& aState,
nsLineBox* aLine,
nsLineBox** aFromList,
PRBool aUpdateGeometricParent,
nsIFrame*& aFrameResult,
PRBool& aStopPulling)
{
nsLineBox* fromLine = *aFromList;
NS_ASSERTION(nsnull != fromLine, "bad line to pull from");
if (0 == fromLine->ChildCount()) {
// Discard empty lines immediately. Empty lines can happen here
// because of DeleteChildsNextInFlow not being able to delete
// lines. Don't stop pulling - there may be more frames around.
*aFromList = fromLine->mNext;
NS_ASSERTION(nsnull == fromLine->mFirstChild, "bad empty line");
delete fromLine;
aStopPulling = PR_FALSE;
aFrameResult = nsnull;
}
else if ((0 != aLine->ChildCount()) && 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.
aStopPulling = PR_TRUE;
aFrameResult = nsnull;
}
else {
// Take frame from fromLine
nsIFrame* frame = fromLine->mFirstChild;
if (0 == aLine->mChildCount++) {
aLine->mFirstChild = frame;
aLine->SetIsBlock(fromLine->IsBlock());
NS_ASSERTION(aLine->CheckIsBlock(), "bad line isBlock");
NS_ASSERTION(nsnull == aLine->mFloaters, "bad line floaters");
}
if (0 != --fromLine->mChildCount) {
// Mark line dirty now that we pulled a child
fromLine->MarkDirty();
frame->GetNextSibling(&fromLine->mFirstChild);
}
else {
// Free up the fromLine now that it's empty
*aFromList = fromLine->mNext;
delete fromLine;
}
// Change geometric parents
if (aUpdateGeometricParent) {
frame->SetParent(this);
// The frame is being pulled from a next-in-flow; therefore we
// need to add it to our sibling list.
if (nsnull != aState.mPrevChild) {
aState.mPrevChild->SetNextSibling(frame);
}
frame->SetNextSibling(nsnull);
}
// Stop pulling because we found a frame to pull
aStopPulling = PR_TRUE;
aFrameResult = frame;
#ifdef DEBUG
VerifyFrameCount(mLines);
#endif
}
return NS_OK;
}
void
nsBlockFrame::DidReflowLine(nsBlockReflowState& aState,
nsLineBox* aLine,
PRBool aLineReflowStatus)
{
// If the line no longer needs a floater array, get rid of it and
// save some memory
nsVoidArray* array = aLine->mFloaters;
if (nsnull != array) {
if (0 == array->Count()) {
delete array;
aLine->mFloaters = nsnull;
}
else {
array->Compact();
}
}
}
void
nsBlockFrame::SlideFrames(nsIPresContext& aPresContext,
nsISpaceManager* aSpaceManager,
nsLineBox* aLine, nscoord aDY)
{
#if 0
ListTag(stdout); printf(": SlideFrames: line=%p dy=%d\n", aDY);
#endif
// Adjust the Y coordinate of the frames in the line
nsRect r;
nsIFrame* kid = aLine->mFirstChild;
PRInt32 n = aLine->ChildCount();
while (--n >= 0) {
kid->GetRect(r);
r.y += aDY;
kid->SetRect(r);
// If the child has any floaters that impact the space manager,
// slide them now.
nsIHTMLReflow* ihr;
if (NS_OK == kid->QueryInterface(kIHTMLReflowIID, (void**)&ihr)) {
ihr->MoveInSpaceManager(aPresContext, aSpaceManager, 0, aDY);
}
kid->GetNextSibling(&kid);
}
// Adjust line state
aLine->mBounds.y += aDY;
aLine->mCombinedArea.y += aDY;
}
void
nsBlockFrame::SlideFloaters(nsIPresContext& aPresContext,
nsISpaceManager* aSpaceManager,
nsLineBox* aLine, nscoord aDY,
PRBool aUpdateSpaceManager)
{
nsVoidArray* floaters = aLine->mFloaters;
if (nsnull != floaters) {
nsRect r;
PRInt32 i, n = floaters->Count();
for (i = 0; i < n; i++) {
nsPlaceholderFrame* ph = (nsPlaceholderFrame*) floaters->ElementAt(i);
nsIFrame* floater = ph->GetAnchoredItem();
floater->GetRect(r);
r.y += aDY;
floater->SetRect(r);
if (aUpdateSpaceManager) {
// Adjust placement in space manager by the same amount
aSpaceManager->OffsetRegion(floater, 0, aDY);
}
}
}
}
NS_IMETHODIMP
nsBlockFrame::MoveInSpaceManager(nsIPresContext& aPresContext,
nsISpaceManager* aSpaceManager,
nscoord aDeltaX, nscoord aDeltaY)
{
#if 0
ListTag(stdout); printf(": MoveInSpaceManager: d=%d,%d\n", aDeltaX, aDeltaY);
#endif
nsLineBox* line = mLines;
while (nsnull != line) {
// Move the floaters in the spacemanager
nsVoidArray* floaters = line->mFloaters;
if (nsnull != floaters) {
PRInt32 i, n = floaters->Count();
for (i = 0; i < n; i++) {
nsPlaceholderFrame* ph = (nsPlaceholderFrame*) floaters->ElementAt(i);
nsIFrame* floater = ph->GetAnchoredItem();
aSpaceManager->OffsetRegion(floater, aDeltaX, aDeltaY);
#if 0
((nsFrame*)kid)->ListTag(stdout); printf(": offset=%d,%d\n", aDeltaX, aDeltaY);
#endif
}
}
// Tell kids about the move too
PRInt32 n = line->ChildCount();
nsIFrame* kid = line->mFirstChild;
while (--n >= 0) {
nsIHTMLReflow* ihr;
if (NS_OK == kid->QueryInterface(kIHTMLReflowIID, (void**)&ihr)) {
ihr->MoveInSpaceManager(aPresContext, aSpaceManager, aDeltaX, aDeltaY);
}
kid->GetNextSibling(&kid);
}
line = line->mNext;
}
return NS_OK;
}
NS_IMETHODIMP
nsBlockFrame::AttributeChanged(nsIPresContext* aPresContext,
nsIContent* aChild,
nsIAtom* aAttribute,
PRInt32 aHint)
{
nsresult rv = nsBlockFrameSuper::AttributeChanged(aPresContext, aChild,
aAttribute, aHint);
if (NS_OK != rv) {
return rv;
}
if (nsHTMLAtoms::start == aAttribute) {
// XXX Not sure if this is necessary anymore
RenumberLists();
nsCOMPtr<nsIPresShell> shell;
aPresContext->GetShell(getter_AddRefs(shell));
nsIReflowCommand* reflowCmd;
rv = NS_NewHTMLReflowCommand(&reflowCmd, this,
nsIReflowCommand::ContentChanged,
nsnull,
aAttribute);
if (NS_SUCCEEDED(rv)) {
shell->AppendReflowCommand(reflowCmd);
NS_RELEASE(reflowCmd);
}
}
else if (nsHTMLAtoms::value == aAttribute) {
const nsStyleDisplay* styleDisplay;
GetStyleData(eStyleStruct_Display, (const nsStyleStruct*&) styleDisplay);
if (NS_STYLE_DISPLAY_LIST_ITEM == styleDisplay->mDisplay) {
nsIFrame* nextAncestor = mParent;
nsBlockFrame* blockParent = nsnull;
// Search for the closest ancestor that's a block frame. We
// make the assumption that all related list items share a
// common block parent.
while (nextAncestor != nsnull) {
if (NS_OK == nextAncestor->QueryInterface(kBlockFrameCID,
(void**)&blockParent)) {
break;
}
nextAncestor->GetParent(&nextAncestor);
}
// Tell the enclosing block frame to renumber list items within
// itself
if (nsnull != blockParent) {
// XXX Not sure if this is necessary anymore
blockParent->RenumberLists();
nsCOMPtr<nsIPresShell> shell;
aPresContext->GetShell(getter_AddRefs(shell));
nsIReflowCommand* reflowCmd;
rv = NS_NewHTMLReflowCommand(&reflowCmd, blockParent,
nsIReflowCommand::ContentChanged,
nsnull,
aAttribute);
if (NS_SUCCEEDED(rv)) {
shell->AppendReflowCommand(reflowCmd);
NS_RELEASE(reflowCmd);
}
}
}
}
return rv;
}
nsBlockFrame*
nsBlockFrame::FindFollowingBlockFrame(nsIFrame* aFrame)
{
nsBlockFrame* followingBlockFrame = nsnull;
nsIFrame* frame = aFrame;
for (;;) {
nsIFrame* nextFrame;
frame->GetNextSibling(&nextFrame);
if (nsnull != nextFrame) {
const nsStyleDisplay* display;
nextFrame->GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&) display);
if (NS_STYLE_DISPLAY_BLOCK == display->mDisplay) {
followingBlockFrame = (nsBlockFrame*) nextFrame;
break;
}
else if (NS_STYLE_DISPLAY_INLINE == display->mDisplay) {
// If it's a text-frame and it's just whitespace and we are
// in a normal whitespace situation THEN skip it and keep
// going...
// XXX WRITE ME!
}
frame = nextFrame;
}
else
break;
}
return followingBlockFrame;
}
// XXX This should be a no-op when there is no first-line/letter style
// in force!
void
nsBlockFrame::WillReflowFrame(nsBlockReflowState& aState,
nsLineBox* aLine,
nsIFrame* aFrame)
{
PRBool repairStyleContext = PR_TRUE;
// When reflowing a frame that is on the first-line, check and see
// if a special style context should be placed in the context chain.
if ((nsnull == mPrevInFlow) &&
(0 == aState.mLineLayout->GetLineNumber())) {
if (nsnull != mFirstLineStyle) {
// Update the child frames style to inherit from the first-line
// style.
// XXX add code to check first and only do it if it needs doing!
#ifdef REALLY_NOISY_FIRST_LINE
DumpStyleGeneaology(aFrame, "");
#endif
#ifdef NOISY_FIRST_LINE
ListTag(stdout);
printf(": ");
((nsFrame*)aFrame)->ListTag(stdout);
printf(" adding in first-line style\n");
#endif
aFrame->ReResolveStyleContext(&aState.mPresContext, mFirstLineStyle,
NS_STYLE_HINT_REFLOW, nsnull, nsnull);
repairStyleContext = PR_FALSE;
#ifdef REALLY_NOISY_FIRST_LINE
DumpStyleGeneaology(aFrame, " ");
#endif
}
if ((nsnull != mFirstLetterStyle) &&
aState.mLineLayout->GetFirstLetterStyleOK()) {
aFrame->ReResolveStyleContext(&aState.mPresContext, mFirstLetterStyle,
NS_STYLE_HINT_REFLOW, nsnull, nsnull);
repairStyleContext = PR_FALSE;
}
}
if (repairStyleContext) {
// Update style context when appropriate
nsIStyleContext* kidSC;
aFrame->GetStyleContext(&kidSC);
if (nsnull != kidSC) {
nsIStyleContext* kidParentSC;
kidParentSC = kidSC->GetParent();
if (nsnull != kidParentSC) {
if (kidParentSC != mStyleContext) {
aFrame->ReResolveStyleContext(&aState.mPresContext, mStyleContext,
NS_STYLE_HINT_REFLOW, nsnull, nsnull);
}
NS_RELEASE(kidParentSC);
}
NS_RELEASE(kidSC);
}
}
}
PRBool
nsBlockFrame::ShouldApplyTopMargin(nsBlockReflowState& aState,
nsLineBox* aLine)
{
if (aState.mApplyTopMargin) {
// 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.mApplyTopMargin = PR_TRUE;
return PR_TRUE;
}
// Determine if this line is "essentially" the first line
nsLineBox* line = mLines;
while (line != aLine) {
if ((nsnull != line->mFloaters) && (0 != line->mFloaters->Count())) {
// A line which preceeds aLine is not empty therefore the top
// margin applies.
aState.mApplyTopMargin = PR_TRUE;
return PR_TRUE;
}
if (line->IsBlock()) {
// A line which preceeds aLine contains a block; therefore the
// top margin applies.
aState.mApplyTopMargin = PR_TRUE;
return PR_TRUE;
}
line = line->mNext;
}
// 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;
}
nsIFrame*
nsBlockFrame::GetTopBlockChild()
{
nsIFrame* firstChild = mLines ? mLines->mFirstChild : nsnull;
if (firstChild) {
if (mLines->IsBlock()) {
// Winner
return firstChild;
}
// If the first line is not a block line then the second line must
// be a block line otherwise the top child can't be a block.
nsLineBox* next = mLines->mNext;
if ((nsnull == next) || !next->IsBlock()) {
// There is no line after the first line or its not a block so
// don't bother trying to skip over the first line.
return nsnull;
}
// The only time we can skip over the first line and pretend its
// not there is if the line contains only compressed
// whitespace. If white-space is significant to this frame then we
// can't skip over the line.
const nsStyleText* styleText;
GetStyleData(eStyleStruct_Text, (const nsStyleStruct*&) styleText);
if ((NS_STYLE_WHITESPACE_PRE == styleText->mWhiteSpace) ||
(NS_STYLE_WHITESPACE_MOZ_PRE_WRAP == styleText->mWhiteSpace)) {
// Whitespace is significant
return nsnull;
}
// See if each frame is a text frame that contains nothing but
// whitespace.
PRInt32 n = mLines->mChildCount;
while (--n >= 0) {
nsIContent* content;
nsresult rv = firstChild->GetContent(&content);
if (NS_FAILED(rv) || (nsnull == content)) {
return nsnull;
}
nsITextContent* tc;
rv = content->QueryInterface(kITextContentIID, (void**) &tc);
NS_RELEASE(content);
if (NS_FAILED(rv) || (nsnull == tc)) {
return nsnull;
}
PRBool isws = PR_FALSE;
tc->IsOnlyWhitespace(&isws);
NS_RELEASE(tc);
if (!isws) {
return nsnull;
}
firstChild->GetNextSibling(&firstChild);
}
// If we make it to this point then every frame on the first line
// was compressible white-space. Since we already know that the
// second line contains a block, that block is the
// top-block-child.
return next->mFirstChild;
}
return nsnull;
}
nsresult
nsBlockFrame::ReflowBlockFrame(nsBlockReflowState& aState,
nsLineBox* aLine,
PRBool* aKeepReflowGoing)
{
NS_PRECONDITION(*aKeepReflowGoing, "bad caller");
nsresult rv = NS_OK;
nsIFrame* frame = aLine->mFirstChild;
// When reflowing a block frame we always get the available space
aState.GetAvailableSpace();
// Notify observers that we are about to reflow the line
WillReflowLine(aState, aLine);
// Prepare the block reflow engine
const nsStyleDisplay* display;
frame->GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&) display);
nsBlockReflowContext brc(aState.mPresContext, aState.mReflowState,
aState.mComputeMaxElementSize);
brc.SetNextRCFrame(aState.mNextRCFrame);
// 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 its not significant. Otherwise, dig
// deeper.
PRBool applyTopMargin = PR_FALSE;
nsIFrame* framePrevInFlow;
frame->GetPrevInFlow(&framePrevInFlow);
if (nsnull == framePrevInFlow) {
applyTopMargin = ShouldApplyTopMargin(aState, aLine);
}
// Clear floaters before the block if the clear style is not none
aLine->mBreakType = display->mBreakType;
if (NS_STYLE_CLEAR_NONE != display->mBreakType) {
nscoord saveY, deltaY;
switch (display->mBreakType) {
case NS_STYLE_CLEAR_LEFT:
case NS_STYLE_CLEAR_RIGHT:
case NS_STYLE_CLEAR_LEFT_AND_RIGHT:
// Apply the previous margin before clearing
saveY = aState.mY + aState.mPrevBottomMargin;
aState.ClearFloaters(saveY, display->mBreakType);
// Determine how far we just moved. If we didn't move then there
// was nothing to clear to don't mess with the normal margin
// collapsing behavior. In either case we need to restore the Y
// coordinate to what it was before the clear.
deltaY = aState.mY - saveY;
if (0 != deltaY) {
// Pretend that the distance we just moved is a previous
// blocks bottom margin. Note that GetAvailableSpace has been
// done so that the available space calculations will be done
// after clearing the appropriate floaters.
//
// What we are doing here is applying CSS2 section 9.5.2's
// rules for clearing - "The top margin of the generated box
// is increased enough that the top border edge is below the
// bottom outer edge of the floating boxes..."
//
// What this will do is cause the top-margin of the block
// frame we are about to reflow to be collapsed with that
// distance.
aState.mPrevBottomMargin = deltaY;
aState.mY = saveY;
// Force margin to be applied in this circumstance
applyTopMargin = PR_TRUE;
}
else {
// Put aState.mY back to its original value since no clearing
// happened. That way the previous blocks bottom margin will
// be applied properly.
aState.mY = saveY - aState.mPrevBottomMargin;
}
break;
}
}
// Compute the available space for the block
nscoord availHeight = aState.mUnconstrainedHeight
? NS_UNCONSTRAINEDSIZE
: aState.mBottomEdge - aState.mY;
// Now setup the availSpace rect. If the block frame we are
// reflowing is one of "ours" (block, run-in, compact, list-item)
// then we get it an available space that is *NOT* affected by
// floaters. Otherwise we position the block outside of the
// floaters.
const nsMargin& borderPadding = aState.BorderPadding();
nscoord availX, availWidth;
nsSplittableType splitType;
switch (display->mDisplay) {
case NS_STYLE_DISPLAY_BLOCK:
case NS_STYLE_DISPLAY_RUN_IN:
case NS_STYLE_DISPLAY_COMPACT:
case NS_STYLE_DISPLAY_LIST_ITEM:
if (NS_SUCCEEDED(frame->IsSplittable(splitType)) &&
(NS_FRAME_SPLITTABLE_NON_RECTANGULAR == splitType)) {
availX = borderPadding.left;
availWidth = aState.mUnconstrainedWidth
? NS_UNCONSTRAINEDSIZE
: aState.mContentArea.width;
break;
}
// Assume the frame is clueless about the space manager
// FALLTHROUGH
default:
availX = aState.mAvailSpaceRect.x + borderPadding.left;
availWidth = aState.mAvailSpaceRect.width;
break;
}
// Reflow the block into the available space
nsRect availSpace(availX, aState.mY, availWidth, availHeight);
WillReflowFrame(aState, aLine, frame);
nsReflowStatus frameReflowStatus;
nsMargin computedOffsets;
rv = brc.ReflowBlock(frame, availSpace, applyTopMargin,
aState.mPrevBottomMargin, aState.IsAdjacentWithTop(),
computedOffsets, frameReflowStatus);
if (NS_FAILED(rv)) {
return rv;
}
aState.mPrevChild = frame;
#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);
*aKeepReflowGoing = PR_FALSE;
aState.mReflowStatus = NS_FRAME_NOT_COMPLETE;
}
else {
// Note: line-break-after a block is a nop
// Try to place the child block
PRBool isAdjacentWithTop = aState.IsAdjacentWithTop();
nscoord collapsedBottomMargin;
*aKeepReflowGoing = brc.PlaceBlock(isAdjacentWithTop, computedOffsets,
&collapsedBottomMargin,
aLine->mBounds, aLine->mCombinedArea);
if (*aKeepReflowGoing) {
// Some of the child block fit
// Advance to new Y position
nscoord newY = aLine->mBounds.YMost();
aState.mY = newY;
aLine->mCarriedOutBottomMargin = brc.GetCarriedOutBottomMargin();
// Continue the block frame now if it didn't completely fit in
// the available space.
if (NS_FRAME_IS_NOT_COMPLETE(frameReflowStatus)) {
PRBool madeContinuation;
rv = CreateContinuationFor(aState, aLine, frame, madeContinuation);
if (NS_FAILED(rv)) {
return rv;
}
// Push continuation to a new line, but only if we actually
// made one.
if (madeContinuation) {
frame->GetNextSibling(&frame);
nsLineBox* line = new nsLineBox(frame, 1, LINE_IS_BLOCK);
if (nsnull == line) {
return NS_ERROR_OUT_OF_MEMORY;
}
line->mNext = aLine->mNext;
aLine->mNext = line;
// Do not count the continuation child on the line it used
// to be on
aLine->mChildCount--;
}
// Advance to next line since some of the block fit. That way
// only the following lines will be pushed.
aState.mPrevLine = aLine;
PushLines(aState);
aState.mReflowStatus = NS_FRAME_NOT_COMPLETE;
*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.
aState.mPrevBottomMargin = 0;
}
else {
aState.mPrevBottomMargin = collapsedBottomMargin;
}
#ifdef NOISY_VERTICAL_MARGINS
ListTag(stdout);
printf(": frame=");
nsFrame::ListTag(stdout, frame);
printf(" carriedOutBottomMargin=%d collapsedBottomMargin=%d => %d\n",
aLine->mCarriedOutBottomMargin, collapsedBottomMargin,
aState.mPrevBottomMargin);
#endif
// Post-process the "line"
nsSize maxElementSize(brc.GetMaxElementSize());
if ((0 != aState.mCurrentBand.GetFloaterCount()) &&
(NS_FRAME_SPLITTABLE_NON_RECTANGULAR != splitType)) {
// Add in floater impacts to the lines max-element-size, but
// only if the block element isn't one of us (otherwise the
// floater impacts will be counted twice).
ComputeLineMaxElementSize(aState, aLine, &maxElementSize);
}
PostPlaceLine(aState, aLine, maxElementSize);
// Place the "marker" (bullet) frame.
//
// 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. Its 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 (HaveOutsideBullet() &&
((aLine == mLines) ||
((0 == mLines->mBounds.height) && (aLine == mLines->mNext)))) {
// Reflow the bullet
nsHTMLReflowMetrics metrics(nsnull);
ReflowBullet(aState, metrics);
// For bullets that are placed next to a child block, there will
// be no correct ascent value. Therefore, make one up...
nscoord ascent = 0;
const nsStyleFont* font;
nsresult rv;
rv = frame->GetStyleData(eStyleStruct_Font,
(const nsStyleStruct*&) font);
if (NS_SUCCEEDED(rv) && (nsnull != font)) {
nsIRenderingContext& rc = *aState.mReflowState.rendContext;
rc.SetFont(font->mFont);
nsIFontMetrics* fm;
rv = rc.GetFontMetrics(fm);
if (NS_SUCCEEDED(rv) && (nsnull != fm)) {
fm->GetMaxAscent(ascent);
NS_RELEASE(fm);
}
}
// Tall bullets won't look particularly nice here...
nsRect bbox;
mBullet->GetRect(bbox);
nscoord topMargin = applyTopMargin ? collapsedBottomMargin : 0;
bbox.y = borderPadding.top + ascent - metrics.ascent + topMargin;
mBullet->SetRect(bbox);
}
}
else {
// None of the block fits. Determine the correct reflow status.
if (aLine == mLines) {
// 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);
aState.mReflowStatus = NS_FRAME_NOT_COMPLETE;
}
}
}
#ifdef DEBUG
VerifyFrameCount(mLines);
#endif
return rv;
}
#define LINE_REFLOW_OK 0
#define LINE_REFLOW_STOP 1
#define LINE_REFLOW_REDO 2
nsresult
nsBlockFrame::ReflowInlineFrames(nsBlockReflowState& aState,
nsLineBox* aLine,
PRBool* aKeepReflowGoing)
{
nsresult rv = NS_OK;
*aKeepReflowGoing = PR_TRUE;
#ifdef DEBUG
PRInt32 spins = 0;
#endif
for (;;) {
if (nsnull != aLine->mFloaters) {
// Forget all of the floaters on the line
aLine->mFloaters->Clear();
}
aState.mFloaterCombinedArea.SetRect(0, 0, 0, 0);
aState.mPendingFloaters.Clear();
// Setup initial coordinate system for reflowing the inline frames
// into. Apply a previous block frame's bottom margin first.
aState.mY += aState.mPrevBottomMargin;
aState.GetAvailableSpace();
const nsMargin& borderPadding = aState.BorderPadding();
nscoord x = aState.mAvailSpaceRect.x + borderPadding.left;
nscoord availWidth = aState.mAvailSpaceRect.width;
nscoord availHeight;
if (aState.mUnconstrainedHeight) {
availHeight = NS_UNCONSTRAINEDSIZE;
}
else {
/* XXX get the height right! */
availHeight = aState.mAvailSpaceRect.height;
}
PRBool impactedByFloaters = 0 != aState.mCurrentBand.GetFloaterCount();
nsLineLayout* lineLayout = aState.mLineLayout;
lineLayout->BeginLineReflow(x, aState.mY,
availWidth, availHeight,
impactedByFloaters,
PR_FALSE /*XXX isTopOfPage*/);
// Notify observers that we are about to reflow the line
WillReflowLine(aState, aLine);
// Reflow the frames that are already on the line first
PRUint8 lineReflowStatus = LINE_REFLOW_OK;
PRInt32 i;
nsIFrame* frame = aLine->mFirstChild;
for (i = 0; i < aLine->ChildCount(); i++) {
rv = ReflowInlineFrame(aState, aLine, frame, &lineReflowStatus);
if (NS_FAILED(rv)) {
return rv;
}
if (LINE_REFLOW_OK != lineReflowStatus) {
// It is possible that one or more of next lines are empty
// (because of DeleteChildsNextInFlow). If so, delete them now
// in case we are finished.
nsLineBox* nextLine = aLine->mNext;
while ((nsnull != nextLine) && (0 == nextLine->ChildCount())) {
// XXX Is this still necessary now that DeleteChildsNextInFlow
// uses DoRemoveFrame?
aLine->mNext = nextLine->mNext;
NS_ASSERTION(nsnull == nextLine->mFirstChild, "bad empty line");
delete nextLine;
nextLine = aLine->mNext;
}
break;
}
frame->GetNextSibling(&frame);
}
// Pull frames and reflow them until we can't
while (LINE_REFLOW_OK == lineReflowStatus) {
nsIFrame* frame;
rv = PullFrame(aState, aLine, frame);
if (NS_FAILED(rv)) {
return rv;
}
if (nsnull == frame) {
break;
}
while (LINE_REFLOW_OK == lineReflowStatus) {
PRInt32 oldCount = aLine->ChildCount();
rv = ReflowInlineFrame(aState, aLine, frame, &lineReflowStatus);
if (NS_FAILED(rv)) {
return rv;
}
if (aLine->ChildCount() != 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->GetNextSibling(&frame);
}
else {
break;
}
}
}
if (LINE_REFLOW_REDO == lineReflowStatus) {
// This happens only when we have a line that is impacted by
// floaters and the first element in the line doesn't fit with
// the floaters.
//
// What we do is to advance past the first floater we find and
// then reflow the line all over again.
NS_ASSERTION(aState.mCurrentBand.GetFloaterCount(),
"redo line on totally empty line");
NS_ASSERTION(NS_UNCONSTRAINEDSIZE != aState.mAvailSpaceRect.height,
"unconstrained height on totally empty line");
aState.mY += aState.mAvailSpaceRect.height;
// 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 floater.
lineLayout->EndLineReflow();
#ifdef DEBUG
spins++;
if (1000 == spins) {
ListTag(stdout);
printf(": yikes! spinning on a line over 1000 times!\n");
NS_ABORT();
}
#endif
continue;
}
// If we are propogating out a break-before status then there is
// no point in placing the line.
if (NS_INLINE_IS_BREAK_BEFORE(aState.mReflowStatus)) {
lineLayout->EndLineReflow();
}
else {
rv = PlaceLine(aState, aLine, aKeepReflowGoing);
}
break;
}
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->mBreakType will be set
* to something other than NS_STYLE_CLEAR_NONE.
*/
nsresult
nsBlockFrame::ReflowInlineFrame(nsBlockReflowState& aState,
nsLineBox* aLine,
nsIFrame* aFrame,
PRUint8* aLineReflowStatus)
{
*aLineReflowStatus = LINE_REFLOW_OK;
// Send pre-reflow notification
WillReflowFrame(aState, aLine, aFrame);
// If it's currently ok to be reflowing in first-letter style then
// we must be about to reflow a frame that has first-letter style.
PRBool reflowingFirstLetter = aState.mLineLayout->GetFirstLetterStyleOK();
// Reflow the inline frame
nsLineLayout* lineLayout = aState.mLineLayout;
nsReflowStatus frameReflowStatus;
nsresult rv = lineLayout->ReflowFrame(aFrame, &aState.mNextRCFrame,
frameReflowStatus);
if (NS_FAILED(rv)) {
return 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;
// 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->mBreakType = NS_STYLE_CLEAR_NONE;
if (NS_INLINE_IS_BREAK(frameReflowStatus)) {
// 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->mBreakType be set to in all these cases?
PRUint8 breakType = NS_INLINE_GET_BREAK_TYPE(frameReflowStatus);
NS_ASSERTION(breakType != NS_STYLE_CLEAR_NONE, "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 theres no room (e.g. on a
// line with wide floaters). Inform the caller to reflow the
// line after skipping past a floater.
*aLineReflowStatus = LINE_REFLOW_REDO;
}
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, aLine, aFrame);
if (NS_FAILED(rv)) {
return rv;
}
}
}
else {
// Break-after cases
aLine->mBreakType = breakType;
if (NS_FRAME_IS_NOT_COMPLETE(frameReflowStatus)) {
// Create a continuation for the incomplete frame. Note that the
// frame may already have a continuation.
PRBool madeContinuation;
rv = CreateContinuationFor(aState, aLine, aFrame, madeContinuation);
if (NS_FAILED(rv)) {
return rv;
}
}
// Split line, but after the frame just reflowed
nsIFrame* nextFrame;
aFrame->GetNextSibling(&nextFrame);
rv = SplitLine(aState, aLine, nextFrame);
if (NS_FAILED(rv)) {
return rv;
}
// Mark next line dirty in case SplitLine didn't end up
// pushing any frames.
nsLineBox* next = aLine->mNext;
if ((nsnull != next) && !next->IsBlock()) {
next->MarkDirty();
}
}
}
else if (NS_FRAME_IS_NOT_COMPLETE(frameReflowStatus)) {
// Frame is not-complete, no special breaking status
// Create a continuation for the incomplete frame. Note that the
// frame may already have a continuation.
PRBool madeContinuation;
rv = CreateContinuationFor(aState, aLine, aFrame, madeContinuation);
if (NS_FAILED(rv)) {
return rv;
}
PRBool needSplit = PR_FALSE;
if (!reflowingFirstLetter) {
needSplit = PR_TRUE;
}
else {
#if 0
// We need to repair the style-contexts of the continuation
// frame for the frame we just reflowed so that it not longer
// has first-letter style..
nsIFrame* nextInFlow;
aFrame->GetNextInFlow(&nextInFlow);
if (nsnull != nextInFlow) {
nsIStyleContext* kidSC;
nextInFlow->GetStyleContext(&kidSC);
if (nsnull != kidSC) {
nsIStyleContext* kidParentSC;
kidParentSC = kidSC->GetParent();
if (nsnull != kidParentSC) {
if (kidParentSC == mFirstLetterStyle) {
nsFrame::ListTag(stdout, nextInFlow);
printf(": changing style contexts\n");
nextInFlow->ReResolveStyleContext(&aState.mPresContext,
(mFirstLineStyle
? mFirstLineStyle
: mStyleContext),
NS_STYLE_HINT_REFLOW, nsnull,
nsnull);
}
NS_RELEASE(kidParentSC);
}
NS_RELEASE(kidSC);
}
}
#endif
}
if (needSplit) {
// Split line after the current frame
*aLineReflowStatus = LINE_REFLOW_STOP;
aFrame->GetNextSibling(&aFrame);
rv = SplitLine(aState, aLine, aFrame);
if (NS_FAILED(rv)) {
return rv;
}
// Mark next line dirty in case SplitLine didn't end up
// pushing any frames.
nsLineBox* next = aLine->mNext;
if ((nsnull != next) && !next->IsBlock()) {
next->MarkDirty();
}
}
}
return NS_OK;
}
/**
* Create a continuation, if necessary, for aFrame. Place it on the
* same line that aFrame is on. Set aMadeNewFrame to PR_TRUE if a
* new frame is created.
*/
nsresult
nsBlockFrame::CreateContinuationFor(nsBlockReflowState& aState,
nsLineBox* aLine,
nsIFrame* aFrame,
PRBool& aMadeNewFrame)
{
aMadeNewFrame = PR_FALSE;
nsresult rv;
nsIFrame* nextInFlow;
rv = CreateNextInFlow(aState.mPresContext, this, aFrame, nextInFlow);
if (NS_FAILED(rv)) {
return rv;
}
if (nsnull != nextInFlow) {
aMadeNewFrame = PR_TRUE;
aLine->mChildCount++;
}
#ifdef DEBUG
VerifyFrameCount(mLines);
#endif
return rv;
}
nsresult
nsBlockFrame::SplitLine(nsBlockReflowState& aState,
nsLineBox* aLine,
nsIFrame* aFrame)
{
nsLineLayout* lineLayout = aState.mLineLayout;
PRInt32 pushCount = aLine->ChildCount() - lineLayout->GetCurrentSpanCount();
//printf("BEFORE (pushCount=%d):\n", pushCount);
//aLine->List(stdout, 0);
if (0 != pushCount) {
NS_ASSERTION(aLine->ChildCount() > pushCount, "bad push");
NS_ASSERTION(nsnull != aFrame, "whoops");
nsLineBox* to = aLine->mNext;
if (nsnull != to) {
// Only push into the next line if it's empty; otherwise we can
// end up pushing a frame which is continued into the same frame
// as it's continuation. This causes all sorts of bad side
// effects so we don't allow it.
if (0 != to->ChildCount()) {
nsLineBox* insertedLine = new nsLineBox(aFrame, pushCount, 0);
if (nsnull == insertedLine) {
return NS_ERROR_OUT_OF_MEMORY;
}
aLine->mNext = insertedLine;
insertedLine->mNext = to;
to = insertedLine;
} else {
to->mFirstChild = aFrame;
to->mChildCount = pushCount;
to->MarkDirty();
}
} else {
to = new nsLineBox(aFrame, pushCount, 0);
if (nsnull == to) {
return NS_ERROR_OUT_OF_MEMORY;
}
aLine->mNext = to;
}
to->SetIsBlock(aLine->IsBlock());
aLine->mChildCount -= pushCount;
// Let line layout know that some frames are no longer part of its
// state.
if (!aLine->IsBlock()) {
lineLayout->SplitLineTo(aLine->ChildCount());
}
#ifdef DEBUG
VerifyFrameCount(mLines);
#endif
}
return NS_OK;
}
PRBool
nsBlockFrame::ShouldJustifyLine(nsBlockReflowState& aState, nsLineBox* aLine)
{
nsLineBox* next = aLine->mNext;
while (nsnull != next) {
// There is another line
if (0 != next->ChildCount()) {
// 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 !next->IsBlock();
}
// The next line is empty, try the next one
next = next->mNext;
}
// XXX Not sure about this part
// Try our next-in-flows lines to answer the question
nsBlockFrame* nextInFlow = (nsBlockFrame*) mNextInFlow;
while (nsnull != nextInFlow) {
nsLineBox* line = nextInFlow->mLines;
while (nsnull != line) {
if (0 != line->ChildCount()) {
return !line->IsBlock();
}
line = line->mNext;
}
nextInFlow = (nsBlockFrame*) nextInFlow->mNextInFlow;
}
// This is the last line - so don't allow justification
return PR_FALSE;
}
nsresult
nsBlockFrame::PlaceLine(nsBlockReflowState& aState,
nsLineBox* aLine,
PRBool* aKeepReflowGoing)
{
nsresult rv = NS_OK;
// 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. Its 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>... ).
//
// For this code, only the first case is possible because this
// method is used for placing a line of inline frames. If the rare
// case is happening then the worst that will happen is that the
// bullet frame will be reflowed twice.
nsLineLayout* lineLayout = aState.mLineLayout;
PRBool addedBullet = PR_FALSE;
if (HaveOutsideBullet() && (aLine == mLines) &&
!lineLayout->IsZeroHeight()) {
nsHTMLReflowMetrics metrics(nsnull);
ReflowBullet(aState, metrics);
lineLayout->AddBulletFrame(mBullet, metrics);
addedBullet = PR_TRUE;
}
nsSize maxElementSize;
lineLayout->VerticalAlignFrames(aLine->mBounds, maxElementSize);
#ifdef DEBUG
if (CRAZY_HEIGHT(aLine->mBounds.y)) {
nsFrame::ListTag(stdout);
printf(": line=%p y=%d line.bounds.height=%d\n",
aLine, aLine->mBounds.y, aLine->mBounds.height);
}
#endif
// Only block frames horizontally align their children because
// inline frames "shrink-wrap" around their children (therefore
// there is no extra horizontal space).
#if XXX_fix_me
PRBool allowJustify = PR_TRUE;
if (NS_STYLE_TEXT_ALIGN_JUSTIFY == aState.mStyleText->mTextAlign) {
allowJustify = ShouldJustifyLine(aState, aLine);
}
#else
PRBool allowJustify = PR_FALSE;
#endif
lineLayout->TrimTrailingWhiteSpace(aLine->mBounds);
lineLayout->HorizontalAlignFrames(aLine->mBounds, allowJustify);
lineLayout->RelativePositionFrames(aLine->mCombinedArea);
if (addedBullet) {
lineLayout->RemoveBulletFrame(mBullet);
}
// Calculate the bottom margin for the line.
nscoord lineBottomMargin = 0;
if (0 == aLine->mBounds.height) {
nsIFrame* brFrame = lineLayout->GetBRFrame();
if (nsnull != brFrame) {
// If a line ends in a BR, and the line is empty of height, then
// we make sure that the line ends up with some height
// anyway. Note that the height looks like vertical margin so
// that it can compress with other block margins.
nsIStyleContext* brSC;
nsIPresContext& px = aState.mPresContext;
nsresult rv = brFrame->GetStyleContext(&brSC);
if ((NS_OK == rv) && (nsnull != brSC)) {
const nsStyleFont* font = (const nsStyleFont*)
brSC->GetStyleData(eStyleStruct_Font);
nsIFontMetrics* fm = nsnull;
px.GetMetricsFor(font->mFont, &fm);
if (nsnull != fm) {
fm->GetHeight(lineBottomMargin);
NS_RELEASE(fm);
}
NS_RELEASE(brSC);
}
}
}
#if 0
// Calculate the lines top and bottom margin values. The margin will
// come from an embedded block frame, not from inline
// frames. Because this is an "inline" line, the child margins are
// all effectively zero so we pass in nsMargin(0, 0, 0, 0).
nscoord topMargin, bottomMargin;
nscoord cotm = lineLayout->GetCarriedOutTopMargin();
nscoord cobm = lineLayout->GetCarriedOutBottomMargin();
nsBlockReflowContext::CollapseMargins(nsMargin(0, 0, 0, 0),
cotm, cobm,
aLine->mBounds.height,
aState.mPrevBottomMargin,
topMargin, bottomMargin);
if (!aState.ShouldApplyTopMargin()) {
aState.mCarriedOutTopMargin = topMargin;
topMargin = 0;
}
//XXX aLine->mCarriedOutTopMargin = cotm;
aLine->mCarriedOutBottomMargin = lineLayout->GetCarriedOutBottomMargin();
#endif
// 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->mBounds.height > 0) {
// This line has some height. Therefore the application of the
// previous-bottom-margin should stick.
aState.mPrevBottomMargin = 0;
newY = aLine->mBounds.YMost() + lineBottomMargin;
}
else {
// Don't let the previous-bottom-margin value affect the newY
// coordinate (it was applied in ReflowInlineFrames speculatively)
// since the line is empty.
newY = aState.mY - aState.mPrevBottomMargin + lineBottomMargin;
}
aLine->mCarriedOutBottomMargin = 0;/* XXX ib */
// See if the line fit. If it doesn't we need to push it. Our first
// line will always fit.
if ((mLines != aLine) && (newY > aState.mBottomEdge)) {
// Push this line and all of it's children and anything else that
// follows to our next-in-flow
PushLines(aState);
// Stop reflow and whack the reflow status if reflow hasn't
// already been stopped.
if (*aKeepReflowGoing) {
NS_ASSERTION(NS_FRAME_COMPLETE == aState.mReflowStatus,
"lost reflow status");
aState.mReflowStatus = NS_FRAME_NOT_COMPLETE;
*aKeepReflowGoing = PR_FALSE;
}
lineLayout->EndLineReflow();
return rv;
}
#if 0
if (0 != topMargin) {
// Apply collapsed top-margin value
SlideFrames(aState.mPresContext, aState.mSpaceManager, aLine, topMargin);
SlideFloaters(aState.mPresContext, aState.mSpaceManager, aLine, topMargin,
PR_TRUE);
}
#endif
aState.mY = newY;
if (0 != aState.mCurrentBand.GetFloaterCount()) {
// Add in floater impacts to the lines max-element-size
ComputeLineMaxElementSize(aState, aLine, &maxElementSize);
}
PostPlaceLine(aState, aLine, maxElementSize);
// Any below current line floaters to place?
if (0 != aState.mPendingFloaters.Count()) {
// Now is the time that we reflow them and update the computed
// line combined area.
aState.PlaceBelowCurrentLineFloaters(&aState.mPendingFloaters, PR_TRUE);
aState.mPendingFloaters.Clear();
}
// When a line has floaters, factor them into the combined-area
// computations.
if (nsnull != aLine->mFloaters) {
// Combine the floater combined area (stored in aState) and the
// value computed by the line layout code.
CombineRects(aState.mFloaterCombinedArea, aLine->mCombinedArea);
}
// Apply break-after clearing if necessary
PRUint8 breakType = aLine->mBreakType;
switch (breakType) {
case NS_STYLE_CLEAR_LEFT:
case NS_STYLE_CLEAR_RIGHT:
case NS_STYLE_CLEAR_LEFT_AND_RIGHT:
aState.ClearFloaters(aState.mY, breakType);
break;
}
lineLayout->EndLineReflow();
return rv;
}
// Compute the line's max-element-size by adding into the raw value
// computed by reflowing the contents of the line (aMaxElementSize)
// the impact of floaters on this line or the preceeding lines.
void
nsBlockFrame::ComputeLineMaxElementSize(nsBlockReflowState& aState,
nsLineBox* aLine,
nsSize* aMaxElementSize)
{
nscoord maxWidth, maxHeight;
aState.mCurrentBand.GetMaxElementSize(&maxWidth, &maxHeight);
#ifdef NOISY_MAX_ELEMENT_SIZE
IndentBy(stdout, GetDepth());
if (NS_UNCONSTRAINEDSIZE == aState.mReflowState.availableWidth) {
printf("PASS1 ");
}
ListTag(stdout);
printf(": maxFloaterSize=%d,%d\n", maxWidth, maxHeight);
#endif
// If the floaters are wider than the content, then use the maximum
// floater width as the maximum width.
//
// It used to be the case that we would always place some content
// next to a floater, regardless of the amount of available space
// after subtracing off the floaters sizes. This can lead to content
// overlapping floaters, so we no longer do this (and pass CSS2's
// conformance tests). This is not how navigator 4-1 used to do
// things.
if (maxWidth > aMaxElementSize->width) {
aMaxElementSize->width = maxWidth;
}
// Only update the max-element-size's height value if the floater is
// part of the current line.
if ((nsnull != aLine->mFloaters) &&
(0 != aLine->mFloaters->Count())) {
// If the maximum-height of the tallest floater is larger than the
// maximum-height of the content then update the max-element-size
// height
if (maxHeight > aMaxElementSize->height) {
aMaxElementSize->height = maxHeight;
}
}
}
void
nsBlockFrame::PostPlaceLine(nsBlockReflowState& aState,
nsLineBox* aLine,
const nsSize& aMaxElementSize)
{
// Update max-element-size
if (aState.mComputeMaxElementSize) {
if (aMaxElementSize.width > aState.mMaxElementSize.width) {
#ifdef NOISY_MAX_ELEMENT_SIZE
IndentBy(stdout, GetDepth());
if (NS_UNCONSTRAINEDSIZE == aState.mReflowState.availableWidth) {
printf("PASS1 ");
}
ListTag(stdout);
printf(": old max-element-size.width=%d new=%d\n",
aState.mMaxElementSize.width,
aMaxElementSize.width);
#endif
aState.mMaxElementSize.width = aMaxElementSize.width;
}
if (aMaxElementSize.height > aState.mMaxElementSize.height) {
#ifdef NOISY_MAX_ELEMENT_SIZE
IndentBy(stdout, GetDepth());
if (NS_UNCONSTRAINEDSIZE == aState.mReflowState.availableWidth) {
printf("PASS1 ");
}
ListTag(stdout);
printf(": old max-element-size.height=%d new=%d\n",
aState.mMaxElementSize.height,
aMaxElementSize.height);
#endif
aState.mMaxElementSize.height = aMaxElementSize.height;
}
}
#if XXX_need_line_outside_children
// Compute LINE_OUTSIDE_CHILDREN state for this line. The bit is set
// if any child frame has outside children.
if ((aLine->mCombinedArea.x < aLine->mBounds.x) ||
(aLine->mCombinedArea.XMost() > aLine->mBounds.XMost()) ||
(aLine->mCombinedArea.y < aLine->mBounds.y) ||
(aLine->mCombinedArea.YMost() > aLine->mBounds.YMost())) {
aLine->SetOutsideChildren();
}
else {
aLine->ClearOutsideChildren();
}
#endif
// Update xmost
nscoord xmost = aLine->mBounds.XMost();
if (xmost > aState.mKidXMost) {
#ifdef DEBUG
if (CRAZY_WIDTH(xmost)) {
ListTag(stdout);
printf(": line=%p xmost=%d\n", aLine, xmost);
}
#endif
aState.mKidXMost = xmost;
}
}
static nsresult
FindFloatersIn(nsIFrame* aFrame, nsVoidArray*& aArray)
{
const nsStyleDisplay* display;
aFrame->GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&) display);
if (NS_STYLE_FLOAT_NONE != display->mFloats) {
if (nsnull == aArray) {
aArray = new nsVoidArray();
if (nsnull == aArray) {
return NS_ERROR_OUT_OF_MEMORY;
}
}
aArray->AppendElement(aFrame);
}
if (NS_STYLE_DISPLAY_INLINE == display->mDisplay) {
nsIFrame* kid;
aFrame->FirstChild(nsnull, &kid);
while (nsnull != kid) {
nsresult rv = FindFloatersIn(kid, aArray);
if (NS_OK != rv) {
return rv;
}
kid->GetNextSibling(&kid);
}
}
return NS_OK;
}
void
nsBlockFrame::FindFloaters(nsLineBox* aLine)
{
nsVoidArray* floaters = aLine->mFloaters;
if (nsnull != floaters) {
// Empty floater array before proceeding
floaters->Clear();
}
nsIFrame* frame = aLine->mFirstChild;
PRInt32 n = aLine->ChildCount();
while (--n >= 0) {
FindFloatersIn(frame, floaters);
frame->GetNextSibling(&frame);
}
aLine->mFloaters = floaters;
// Get rid of floater array if we don't need it
if (nsnull != floaters) {
if (0 == floaters->Count()) {
delete floaters;
aLine->mFloaters = nsnull;
}
}
}
void
nsBlockFrame::PushLines(nsBlockReflowState& aState)
{
NS_ASSERTION(nsnull != aState.mPrevLine, "bad push");
nsLineBox* lastLine = aState.mPrevLine;
nsLineBox* nextLine = lastLine->mNext;
lastLine->mNext = nsnull;
mOverflowLines = nextLine;
// Mark all the overflow lines dirty so that they get reflowed when
// they are pulled up by our next-in-flow.
while (nsnull != nextLine) {
nextLine->MarkDirty();
nextLine = nextLine->mNext;
}
// Break frame sibling list
nsIFrame* lastFrame = lastLine->LastChild();
lastFrame->SetNextSibling(nsnull);
#ifdef DEBUG
VerifyOverflowSituation();
#endif
}
PRBool
nsBlockFrame::DrainOverflowLines()
{
#ifdef DEBUG
VerifyOverflowSituation();
#endif
PRBool drained = PR_FALSE;
// First grab the prev-in-flows overflow lines
nsBlockFrame* prevBlock = (nsBlockFrame*) mPrevInFlow;
if (nsnull != prevBlock) {
nsLineBox* line = prevBlock->mOverflowLines;
if (nsnull != line) {
drained = PR_TRUE;
prevBlock->mOverflowLines = nsnull;
// Make all the frames on the mOverflowLines list mine
nsIFrame* lastFrame = nsnull;
nsIFrame* frame = line->mFirstChild;
while (nsnull != frame) {
frame->SetParent(this);
lastFrame = frame;
frame->GetNextSibling(&frame);
}
// Join the line lists
if (nsnull == mLines) {
mLines = line;
}
else {
// Join the sibling lists together
lastFrame->SetNextSibling(mLines->mFirstChild);
// Place overflow lines at the front of our line list
nsLineBox* lastLine = nsLineBox::LastLine(line);
lastLine->mNext = mLines;
mLines = line;
}
}
}
// Now grab our own overflow lines
if (nsnull != mOverflowLines) {
// This can happen when we reflow and not everything fits and then
// we are told to reflow again before a next-in-flow is created
// and reflows.
nsLineBox* lastLine = nsLineBox::LastLine(mLines);
if (nsnull == lastLine) {
mLines = mOverflowLines;
}
else {
lastLine->mNext = mOverflowLines;
nsIFrame* lastFrame = lastLine->LastChild();
lastFrame->SetNextSibling(mOverflowLines->mFirstChild);
// Update our last-content-index now that we have a new last child
lastLine = nsLineBox::LastLine(mOverflowLines);
}
mOverflowLines = nsnull;
drained = PR_TRUE;
}
return drained;
}
//////////////////////////////////////////////////////////////////////
// Frame list manipulation routines
NS_IMETHODIMP
nsBlockFrame::AppendFrames(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList)
{
if (nsLayoutAtoms::floaterList == aListName) {
// XXX we don't *really* care about this right now because we are
// BuildFloaterList ing still
mFloaters.AppendFrames(nsnull, aFrameList);
return NS_OK;
}
else if (nsLayoutAtoms::absoluteList == aListName) {
// XXX temporary until area frame and floater code is updated
return nsFrame::AppendFrames(aPresContext, aPresShell, aListName,
aFrameList);
}
else if (nsnull != aListName) {
return NS_ERROR_INVALID_ARG;
}
nsresult rv = AppendNewFrames(aPresContext, aFrameList);
if (NS_SUCCEEDED(rv)) {
// Generate reflow command to reflow the dirty lines
nsIReflowCommand* reflowCmd = nsnull;
nsresult rv;
rv = NS_NewHTMLReflowCommand(&reflowCmd, this,
nsIReflowCommand::ReflowDirty,
nsnull);
if (NS_SUCCEEDED(rv)) {
if (nsnull != aListName) {
reflowCmd->SetChildListName(aListName);
}
aPresShell.AppendReflowCommand(reflowCmd);
NS_RELEASE(reflowCmd);
}
}
return rv;
}
nsresult
nsBlockFrame::AppendNewFrames(nsIPresContext& aPresContext,
nsIFrame* aNewFrame)
{
// Get our last line and then get its last child
nsIFrame* lastFrame;
nsLineBox* lastLine = nsLineBox::LastLine(mLines);
if (nsnull != lastLine) {
lastFrame = lastLine->LastChild();
} else {
lastFrame = nsnull;
}
// Add the new frames to the sibling list; wrap any frames that
// require wrapping
if (nsnull != lastFrame) {
lastFrame->SetNextSibling(aNewFrame);
}
// Make sure that new inlines go onto the end of the lastLine when
// the lastLine is mapping inline frames.
PRInt32 pendingInlines = 0;
if (nsnull != lastLine) {
if (!lastLine->IsBlock()) {
pendingInlines = 1;
}
}
// Now create some lines for the new frames
nsIFrame* prevFrame = lastFrame;
for (nsIFrame* frame = aNewFrame; nsnull != frame;
frame->GetNextSibling(&frame)) {
// See if the child is a block or non-block
PRBool isBlock = nsLineLayout::TreatFrameAsBlock(frame);
// If the child is an inline then add it to the lastLine (if it's
// an inline line, otherwise make a new line). If the child is a
// block then make a new line and put the child in that line.
if (isBlock) {
// If the previous line has pending inline data to be reflowed,
// do so now.
if (0 != pendingInlines) {
// Set this to true in case we don't end up reflowing all of the
// frames on the line (because they end up being pushed).
lastLine->MarkDirty();
pendingInlines = 0;
}
// Create a line for the block
nsLineBox* line = new nsLineBox(frame, 1, LINE_IS_BLOCK);
if (nsnull == line) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (nsnull == lastLine) {
mLines = line;
}
else {
lastLine->mNext = line;
}
lastLine = line;
}
else {
if (0 == pendingInlines) {
nsLineBox* line = new nsLineBox(frame, 0, 0);
if (nsnull == line) {
return NS_ERROR_OUT_OF_MEMORY;
}
if (nsnull == lastLine) {
mLines = line;
}
else {
lastLine->mNext = line;
}
lastLine = line;
}
lastLine->mChildCount++;
pendingInlines++;
}
// Remember the previous frame
prevFrame = frame;
}
if (0 != pendingInlines) {
// Set this to true in case we don't end up reflowing all of the
// frames on the line (because they end up being pushed).
lastLine->MarkDirty();
}
#ifdef DEBUG
VerifyFrameCount(mLines);
#endif
MarkEmptyLines(aPresContext);
return NS_OK;
}
NS_IMETHODIMP
nsBlockFrame::InsertFrames(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
if (nsLayoutAtoms::floaterList == aListName) {
// XXX we don't *really* care about this right now because we are
// BuildFloaterList ing still
mFloaters.AppendFrames(nsnull, aFrameList);
return NS_OK;
}
else if (nsLayoutAtoms::absoluteList == aListName) {
// XXX temporary until area frame and floater code is updated
return nsFrame::InsertFrames(aPresContext, aPresShell, aListName,
aPrevFrame, aFrameList);
}
else if (nsnull != aListName) {
return NS_ERROR_INVALID_ARG;
}
nsresult rv = InsertNewFrames(aPresContext, aFrameList, aPrevFrame);
#ifdef SLOW_INCREMENTAL_REFLOW
// XXX Temporary code to ensure that that right things
// get marked direty. Kipp will replace this with better
// code.
// Mark everything dirty
nsLineBox* line = mLines;
while (nsnull != line) {
line->MarkDirty();
line = line->mNext;
}
#endif
if (NS_SUCCEEDED(rv)) {
// Generate reflow command to reflow the dirty lines
nsIReflowCommand* reflowCmd = nsnull;
nsresult rv;
rv = NS_NewHTMLReflowCommand(&reflowCmd, this,
nsIReflowCommand::ReflowDirty,
nsnull);
if (NS_SUCCEEDED(rv)) {
if (nsnull != aListName) {
reflowCmd->SetChildListName(aListName);
}
aPresShell.AppendReflowCommand(reflowCmd);
NS_RELEASE(reflowCmd);
}
}
return rv;
}
// XXX rewrite to deal with a list of frames
nsresult
nsBlockFrame::InsertNewFrames(nsIPresContext& aPresContext,
nsIFrame* aFrameList,
nsIFrame* aPrevSibling)
{
if (nsnull == mLines) {
NS_ASSERTION(nsnull == aPrevSibling, "prev-sibling and empty line list!");
return AppendNewFrames(aPresContext, aFrameList);
}
nsIFrame* newFrame = aFrameList;
while (nsnull != newFrame) {
nsIFrame* next;
newFrame->GetNextSibling(&next);
newFrame->SetNextSibling(nsnull);
PRUint16 newFrameIsBlock =
nsLineLayout::TreatFrameAsBlock(newFrame)
? LINE_IS_BLOCK
: 0;
// Insert/append the frame into flows line list at the right spot
nsLineBox* newLine;
nsLineBox* line = mLines;
if (nsnull == aPrevSibling) {
// Insert new frame into the sibling list
newFrame->SetNextSibling(line->mFirstChild);
if (line->IsBlock() || newFrameIsBlock) {
// Create a new line
newLine = new nsLineBox(newFrame, 1, newFrameIsBlock);
if (nsnull == newLine) {
return NS_ERROR_OUT_OF_MEMORY;
}
newLine->mNext = mLines;
mLines = newLine;
} else {
// Insert frame at the front of the line
line->mFirstChild = newFrame;
line->mChildCount++;
line->MarkDirty();
}
}
else {
// Find line containing the previous sibling to the new frame
line = nsLineBox::FindLineContaining(line, aPrevSibling);
NS_ASSERTION(nsnull != line, "no line contains the previous sibling");
if (nsnull != line) {
if (line->IsBlock()) {
// Create a new line just after line
newLine = new nsLineBox(newFrame, 1, newFrameIsBlock);
if (nsnull == newLine) {
return NS_ERROR_OUT_OF_MEMORY;
}
newLine->mNext = line->mNext;
line->mNext = newLine;
}
else if (newFrameIsBlock) {
// Split line in two, if necessary. We can't allow a block to
// end up in an inline line.
if (line->IsLastChild(aPrevSibling)) {
// The new frame goes after prevSibling and prevSibling is
// the last frame on the line. Therefore we don't need to
// split the line, just create a new line.
newLine = new nsLineBox(newFrame, 1, newFrameIsBlock);
if (nsnull == newLine) {
return NS_ERROR_OUT_OF_MEMORY;
}
newLine->mNext = line->mNext;
line->mNext = newLine;
}
else {
// The new frame goes after prevSibling and prevSibling is
// somewhere in the line, but not at the end. Split the line
// just after prevSibling.
PRInt32 i, n = line->ChildCount();
nsIFrame* frame = line->mFirstChild;
for (i = 0; i < n; i++) {
if (frame == aPrevSibling) {
nsIFrame* nextSibling;
aPrevSibling->GetNextSibling(&nextSibling);
// Create new line to hold the remaining frames
NS_ASSERTION(n - i - 1 > 0, "bad line count");
newLine = new nsLineBox(nextSibling, n - i - 1, 0);
if (nsnull == newLine) {
return NS_ERROR_OUT_OF_MEMORY;
}
newLine->mNext = line->mNext;
line->mNext = newLine;
line->MarkDirty();
line->mChildCount = i + 1;
break;
}
frame->GetNextSibling(&frame);
}
// Now create a new line to hold the block
newLine = new nsLineBox(newFrame, 1, newFrameIsBlock);
if (nsnull == newLine) {
return NS_ERROR_OUT_OF_MEMORY;
}
newLine->mNext = line->mNext;
line->mNext = newLine;
}
}
else {
line->mChildCount++;
line->MarkDirty();
}
}
// Insert new frame into the sibling list; note: this must be done
// after the above logic because the above logic depends on the
// sibling list being in the "before insertion" state.
nsIFrame* nextSibling;
aPrevSibling->GetNextSibling(&nextSibling);
newFrame->SetNextSibling(nextSibling);
aPrevSibling->SetNextSibling(newFrame);
}
aPrevSibling = newFrame;
newFrame = next;
}
#ifdef DEBUG
VerifyFrameCount(mLines);
#endif
MarkEmptyLines(aPresContext);
return NS_OK;
}
NS_IMETHODIMP
nsBlockFrame::RemoveFrame(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame)
{
nsresult rv = NS_OK;
if (nsLayoutAtoms::floaterList == aListName) {
// Remove floater from the floater list first
mFloaters.RemoveFrame(aOldFrame);
// Find which line contains the floater
nsLineBox* line = mLines;
while (nsnull != line) {
nsVoidArray* floaters = line->mFloaters;
if (nsnull != floaters) {
PRInt32 i, count = floaters->Count();
for (i = 0; i < count; i++) {
nsPlaceholderFrame* ph = (nsPlaceholderFrame*)floaters->ElementAt(i);
if (ph->GetAnchoredItem() == aOldFrame) {
// Note: the placeholder is part of the line's child list
// and will be removed later.
// XXX stop storing pointers to the placeholder in the line list???
ph->SetAnchoredItem(nsnull);
floaters->RemoveElementAt(i);
aOldFrame->DeleteFrame(aPresContext);
goto found_it;
}
}
}
line = line->mNext;
}
found_it:
// Mark every line at and below the line where the floater was dirty
while (nsnull != line) {
line->MarkDirty();
line = line->mNext;
}
// We will reflow *after* removing the placeholder (which is done 2nd)
return NS_OK;
}
else if (nsLayoutAtoms::absoluteList == aListName) {
// XXX temporary until area frame code is updated
return nsFrame::RemoveFrame(aPresContext, aPresShell, aListName,
aOldFrame);
}
else if (nsnull != aListName) {
return NS_ERROR_INVALID_ARG;
}
else {
rv = DoRemoveFrame(aPresContext, aOldFrame);
#ifdef SLOW_INCREMENTAL_REFLOW
// XXX Temporary code to ensure that that right things
// get marked direty. Kipp will replace this with better
// code.
// Mark everything dirty
nsLineBox* line = mLines;
while (nsnull != line) {
line->MarkDirty();
line = line->mNext;
}
#endif
}
if (NS_SUCCEEDED(rv)) {
// Generate reflow command to reflow the dirty lines
nsIReflowCommand* reflowCmd = nsnull;
nsresult rv;
rv = NS_NewHTMLReflowCommand(&reflowCmd, this,
nsIReflowCommand::ReflowDirty,
nsnull);
if (NS_SUCCEEDED(rv)) {
if (nsnull != aListName) {
reflowCmd->SetChildListName(aListName);
}
aPresShell.AppendReflowCommand(reflowCmd);
NS_RELEASE(reflowCmd);
}
}
return rv;
}
nsresult
nsBlockFrame::DoRemoveFrame(nsIPresContext& aPresContext,
nsIFrame* aDeletedFrame)
{
// Find the line and the previous sibling that contains
// deletedFrame; we also find the pointer to the line.
nsBlockFrame* flow = this;
nsLineBox** linep = &flow->mLines;
nsLineBox* line = flow->mLines;
nsLineBox* prevLine = nsnull;
nsIFrame* prevSibling = nsnull;
while (nsnull != line) {
nsIFrame* frame = line->mFirstChild;
PRInt32 n = line->ChildCount();
while (--n >= 0) {
if (frame == aDeletedFrame) {
goto found_frame;
}
prevSibling = frame;
frame->GetNextSibling(&frame);
}
linep = &line->mNext;
prevLine = line;
line = line->mNext;
}
found_frame:;
#ifdef NS_DEBUG
NS_ASSERTION(nsnull != line, "can't find deleted frame in lines");
if (nsnull != prevSibling) {
nsIFrame* tmp;
prevSibling->GetNextSibling(&tmp);
NS_ASSERTION(tmp == aDeletedFrame, "bad prevSibling");
}
#endif
// Remove frame and all of its continuations
while (nsnull != aDeletedFrame) {
while ((nsnull != line) && (nsnull != aDeletedFrame)) {
#ifdef NS_DEBUG
nsIFrame* parent;
aDeletedFrame->GetParent(&parent);
NS_ASSERTION(flow == parent, "messed up delete code");
NS_ASSERTION(line->Contains(aDeletedFrame), "frame not in line");
#endif
// See if the frame being deleted is the last one on the line
PRBool isLastFrameOnLine = PR_FALSE;
if (1 == line->mChildCount) {
isLastFrameOnLine = PR_TRUE;
}
else if (line->LastChild() == aDeletedFrame) {
isLastFrameOnLine = PR_TRUE;
}
// Remove aDeletedFrame from the line
nsIFrame* nextFrame;
aDeletedFrame->GetNextSibling(&nextFrame);
if (line->mFirstChild == aDeletedFrame) {
line->mFirstChild = nextFrame;
}
if (!line->IsBlock() && (nsnull != prevLine) && !prevLine->IsBlock()) {
// Make sure the previous line (if it's an inline line) gets
// a reflow too so that it can pullup from the line where we
// just removed the frame.
prevLine->MarkDirty();
// XXX Note: prevLine may be in a prev-in-flow
}
// Take aDeletedFrame out of the sibling list. Note that
// prevSibling will only be nsnull when we are deleting the very
// first frame.
if (nsnull != prevSibling) {
prevSibling->SetNextSibling(nextFrame);
}
// Destroy frame; capture its next-in-flow first in case we need
// to destroy that too.
nsIFrame* nextInFlow;
aDeletedFrame->GetNextInFlow(&nextInFlow);
nsSplittableType st;
aDeletedFrame->IsSplittable(st);
if (NS_FRAME_NOT_SPLITTABLE != st) {
aDeletedFrame->RemoveFromFlow();
}
#ifdef NOISY_REMOVE_FRAME
printf("DoRemoveFrame: prevLine=%p line=%p frame=",
prevLine, line);
nsFrame::ListTag(stdout, aDeletedFrame);
printf(" prevSibling=%p nextInFlow=%p\n", prevSibling, nextInFlow);
#endif
aDeletedFrame->DeleteFrame(aPresContext);
aDeletedFrame = nextInFlow;
// If line is empty, remove it now
nsLineBox* next = line->mNext;
if (0 == --line->mChildCount) {
*linep = next;
line->mNext = nsnull;
delete line;
line = next;
}
else {
// Make the line that just lost a frame dirty
line->MarkDirty();
// If we just removed the last frame on the line then we need
// to advance to the next line.
if (isLastFrameOnLine) {
prevLine = line;
linep = &line->mNext;
line = next;
}
}
// See if we should keep looking in the current flow's line list.
if (nsnull != aDeletedFrame) {
if (aDeletedFrame != nextFrame) {
// The deceased frames continuation is not the next frame in
// the current flow's frame list. Therefore we know that the
// continuation is in a different parent. So break out of
// the loop so that we advance to the next parent.
#ifdef NS_DEBUG
nsIFrame* parent;
aDeletedFrame->GetParent(&parent);
NS_ASSERTION(parent != flow, "strange continuation");
#endif
break;
}
}
}
// Advance to next flow block if the frame has more continuations
if (nsnull != aDeletedFrame) {
flow = (nsBlockFrame*) flow->mNextInFlow;
NS_ASSERTION(nsnull != flow, "whoops, continuation without a parent");
prevLine = nsnull;
line = flow->mLines;
linep = &flow->mLines;
prevSibling = nsnull;
}
}
#ifdef DEBUG
VerifyFrameCount(mLines);
#endif
MarkEmptyLines(aPresContext);
return NS_OK;
}
static PRBool
IsEmptyLine(nsIPresContext& aPresContext, nsLineBox* aLine)
{
PRInt32 i, n = aLine->ChildCount();
nsIFrame* frame = aLine->mFirstChild;
for (i = 0; i < n; i++) {
nsIContent* content;
nsresult rv = frame->GetContent(&content);
if (NS_FAILED(rv) || (nsnull == content)) {
// If it doesn't have any content then this can't be an empty line
return PR_FALSE;
}
nsITextContent* tc;
rv = content->QueryInterface(kITextContentIID, (void**) &tc);
if (NS_FAILED(rv) || (nsnull == tc)) {
// If it's not text content then this can't be an empty line
NS_RELEASE(content);
return PR_FALSE;
}
const nsTextFragment* frag;
PRInt32 numFrags;
rv = tc->GetText(frag, numFrags);
if (NS_FAILED(rv)) {
NS_RELEASE(content);
NS_RELEASE(tc);
return PR_FALSE;
}
// If the text has any non-whitespace characters in it then the
// line is not an empty line.
while (--numFrags >= 0) {
PRInt32 len = frag->GetLength();
if (frag->Is2b()) {
const PRUnichar* cp = frag->Get2b();
const PRUnichar* end = cp + len;
while (cp < end) {
PRUnichar ch = *cp++;
if (!XP_IS_SPACE(ch)) {
NS_RELEASE(tc);
NS_RELEASE(content);
return PR_FALSE;
}
}
}
else {
const char* cp = frag->Get1b();
const char* end = cp + len;
while (cp < end) {
char ch = *cp++;
if (!XP_IS_SPACE(ch)) {
NS_RELEASE(tc);
NS_RELEASE(content);
return PR_FALSE;
}
}
}
frag++;
}
NS_RELEASE(tc);
NS_RELEASE(content);
frame->GetNextSibling(&frame);
}
return PR_TRUE;
}
void
nsBlockFrame::MarkEmptyLines(nsIPresContext& aPresContext)
{
// PRE-formatted content considers whitespace significant
const nsStyleText* text;
GetStyleData(eStyleStruct_Text, (const nsStyleStruct*&) text);
if ((NS_STYLE_WHITESPACE_PRE == text->mWhiteSpace) ||
(NS_STYLE_WHITESPACE_MOZ_PRE_WRAP == text->mWhiteSpace)) {
return;
}
PRBool afterBlock = PR_TRUE;
nsLineBox* line = mLines;
while (nsnull != line) {
if (line->IsBlock()) {
afterBlock = PR_TRUE;
}
else if (afterBlock) {
afterBlock = PR_FALSE;
// This is an inline line and it is immediately after a block
// (or its our first line). See if it contains nothing but
// collapsible text.
PRBool isEmpty = IsEmptyLine(aPresContext, line);
line->SetIsEmptyLine(isEmpty);
}
else {
line->SetIsEmptyLine(PR_FALSE);
}
line = line->mNext;
}
}
void
nsBlockFrame::DeleteChildsNextInFlow(nsIPresContext& aPresContext,
nsIFrame* aChild)
{
NS_PRECONDITION(IsChild(aChild), "bad geometric parent");
nsIFrame* nextInFlow;
aChild->GetNextInFlow(&nextInFlow);
NS_PRECONDITION(nsnull != nextInFlow, "null next-in-flow");
nsBlockFrame* parent;
nextInFlow->GetParent((nsIFrame**)&parent);
NS_PRECONDITION(nsnull != parent, "next-in-flow with no parent");
NS_PRECONDITION(nsnull != parent->mLines, "next-in-flow with weird parent");
NS_PRECONDITION(nsnull == parent->mOverflowLines, "parent with overflow");
parent->DoRemoveFrame(aPresContext, nextInFlow);
}
////////////////////////////////////////////////////////////////////////
// Floater support
void
nsBlockFrame::ReflowFloater(nsBlockReflowState& aState,
nsPlaceholderFrame* aPlaceholder,
nsHTMLReflowMetrics& aMetrics)
{
// Reflow the floater. Since floaters are continued we given them an
// unbounded height. Floaters with an auto width are sized to zero
// according to the css2 spec.
nsSize kidAvailSize(aState.mAvailSpaceRect.width, NS_UNCONSTRAINEDSIZE);
nsIFrame* floater = aPlaceholder->GetAnchoredItem();
nsHTMLReflowState reflowState(aState.mPresContext, aState.mReflowState,
floater, kidAvailSize);
reflowState.lineLayout = nsnull;
if ((nsnull == aState.mReflowState.reflowCommand) ||
(floater != aState.mNextRCFrame)) {
// Stub out reflowCommand and repair reason in the reflowState
// when incremental reflow doesn't apply to the floater.
reflowState.reflowCommand = nsnull;
reflowState.reason =
(aState.mReflowState.reason == eReflowReason_Initial)
? eReflowReason_Initial
: eReflowReason_Resize;
}
nsIHTMLReflow* ihr;
nsresult rv = floater->QueryInterface(kIHTMLReflowIID, (void**)&ihr);
if (NS_SUCCEEDED(rv)) {
nsReflowStatus status;
ihr->WillReflow(aState.mPresContext);
ihr->Reflow(aState.mPresContext, aMetrics, reflowState, status);
if (!NS_FRAME_IS_REPLACED(reflowState.frameType)) {
// CSS 10.3.5: If 'left', 'right', 'width', 'margin-left', or
// 'margin-right' are specified as 'auto', their computed value
// is '0'.
//
// However, CSS1 says: "The 'width' has a non-negative
// UA-defined minimum value (which may vary from element to
// element and even depend on other properties). If 'width' goes
// below this limit, either because it was set explicitly, or
// because it was 'auto' and the rules below would make it too
// small, the value will be replaced with the minimum value
// instead."
//
// CSS1's definition is better than CSS2's in this regard
// because its compatible with existing content (e.g. a floating
// table that has no specified width).
#if 0
if (0 == reflowState.computedWidth) {
nsFrame::ListTag(stdout, floater);
printf(": auto sized floating element forced to zero width\n");
aMetrics.width = 0;
}
#endif
}
nsFrameState state;
floater->GetFrameState(&state);
if (0 == (NS_FRAME_OUTSIDE_CHILDREN & state)) {
aMetrics.mCombinedArea.x = 0;
aMetrics.mCombinedArea.y = 0;
aMetrics.mCombinedArea.width = aMetrics.width;
aMetrics.mCombinedArea.height = aMetrics.height;
}
floater->SizeTo(aMetrics.width, aMetrics.height);
}
}
void
nsBlockReflowState::InitFloater(nsPlaceholderFrame* aPlaceholder)
{
// Set the geometric parent of the floater
nsIFrame* floater = aPlaceholder->GetAnchoredItem();
floater->SetParent(mBlock);
// Then add the floater to the current line and place it when
// appropriate
AddFloater(aPlaceholder, PR_TRUE);
}
// This is called by the line layout's AddFloater method when a
// place-holder frame is reflowed in a line. If the floater is a
// left-most child (it's x coordinate is at the line's left margin)
// then the floater is place immediately, otherwise the floater
// placement is deferred until the line has been reflowed.
void
nsBlockReflowState::AddFloater(nsPlaceholderFrame* aPlaceholder,
PRBool aInitialReflow)
{
NS_PRECONDITION(nsnull != mCurrentLine, "null ptr");
// Update the current line's floater array
if (nsnull == mCurrentLine->mFloaters) {
mCurrentLine->mFloaters = new nsVoidArray();
}
mCurrentLine->mFloaters->AppendElement(aPlaceholder);
// Now place the floater immediately if possible. Otherwise stash it
// away in mPendingFloaters and place it later.
if (mLineLayout->CanPlaceFloaterNow()) {
nsHTMLReflowMetrics metrics(nsnull);
mBlock->ReflowFloater(*this, aPlaceholder, metrics);
// Because we are in the middle of reflowing a placeholder frame
// within a line (and possibly nested in an inline frame or two
// that's a child of our block) we need to restore the space
// manager's translation to the space that the block resides in
// before placing the floater.
PRBool isLeftFloater;
nscoord ox, oy;
mSpaceManager->GetTranslation(ox, oy);
nscoord dx = ox - mSpaceManagerX;
nscoord dy = oy - mSpaceManagerY;
mSpaceManager->Translate(-dx, -dy);
nsPoint origin;
PlaceFloater(aPlaceholder, &isLeftFloater, &origin);
// Update the floater combined-area
metrics.mCombinedArea.x += origin.x;
metrics.mCombinedArea.y += origin.y;
CombineRects(metrics.mCombinedArea, mFloaterCombinedArea);
// Pass on updated available space to the current inline reflow engine
GetAvailableSpace();
mLineLayout->UpdateBand(mAvailSpaceRect.x + BorderPadding().left, mY,
mAvailSpaceRect.width,
mAvailSpaceRect.height,
isLeftFloater);
// Restore coordinate system
mSpaceManager->Translate(dx, dy);
}
else {
// This floater will be placed after the line is done (it is a
// below current line floater).
mPendingFloaters.AppendElement(aPlaceholder);
}
}
PRBool
nsBlockReflowState::IsLeftMostChild(nsIFrame* aFrame)
{
for (;;) {
nsIFrame* parent;
aFrame->GetParent(&parent);
if (parent == mBlock) {
nsIFrame* child = mCurrentLine->mFirstChild;
PRInt32 n = mCurrentLine->ChildCount();
while ((nsnull != child) && (aFrame != child) && (--n >= 0)) {
nsSize size;
// Is the child zero-sized?
child->GetSize(size);
if (size.width > 0) {
// We found a non-zero sized child frame that precedes aFrame
return PR_FALSE;
}
child->GetNextSibling(&child);
}
break;
}
else {
// See if there are any non-zero sized child frames that precede
// aFrame in the child list
nsIFrame* child;
parent->FirstChild(nsnull, &child);
while ((nsnull != child) && (aFrame != child)) {
nsSize size;
// Is the child zero-sized?
child->GetSize(size);
if (size.width > 0) {
// We found a non-zero sized child frame that precedes aFrame
return PR_FALSE;
}
child->GetNextSibling(&child);
}
}
// aFrame is the left-most non-zero sized frame in its geometric parent.
// Walk up one level and check that its parent is left-most as well
aFrame = parent;
}
return PR_TRUE;
}
PRBool
nsBlockReflowState::CanPlaceFloater(const nsRect& aFloaterRect,
PRUint8 aFloats)
{
// If the current Y coordinate is not impacted by any floaters
// then by definition the floater fits.
PRBool result = PR_TRUE;
if (0 != mCurrentBand.GetFloaterCount()) {
if (mAvailSpaceRect.width < aFloaterRect.width) {
// The available width is too narrow (and its been impacted by a
// prior floater)
result = PR_FALSE;
}
else {
// At this point we know that there is enough horizontal space for
// the floater (somewhere). Lets see if there is enough vertical
// space.
if (mAvailSpaceRect.height < aFloaterRect.height) {
// The available height is too short. However, its possible that
// there is enough open space below which is not impacted by a
// floater.
//
// Compute the X coordinate for the floater based on its float
// type, assuming its placed on the current line. This is
// where the floater will be placed horizontally if it can go
// here.
nscoord x0;
if (NS_STYLE_FLOAT_LEFT == aFloats) {
x0 = mAvailSpaceRect.x;
}
else {
x0 = mAvailSpaceRect.XMost() - aFloaterRect.width;
// In case the floater is too big, don't go past the left edge
if (x0 < mAvailSpaceRect.x) {
x0 = mAvailSpaceRect.x;
}
}
nscoord x1 = x0 + aFloaterRect.width;
// Calculate the top and bottom y coordinates, again assuming
// that the floater is placed on the current line.
const nsMargin& borderPadding = BorderPadding();
nscoord y0 = mY - borderPadding.top;
if (y0 < 0) {
// CSS2 spec, 9.5.1 rule [4]: A floating box's outer top may not
// be higher than the top of its containing block.
// XXX It's not clear if it means the higher than the outer edge
// or the border edge or the inner edge?
y0 = 0;
}
nscoord y1 = y0 + aFloaterRect.height;
nscoord saveY = mY;
for (;;) {
// Get the available space at the new Y coordinate
mY += mAvailSpaceRect.height;
GetAvailableSpace();
if (0 == mCurrentBand.GetFloaterCount()) {
// Winner. This band has no floaters on it, therefore
// there can be no overlap.
break;
}
// Check and make sure the floater won't intersect any
// floaters on this band. The floaters starting and ending
// coordinates must be entirely in the available space.
if ((x0 < mAvailSpaceRect.x) || (x1 > mAvailSpaceRect.XMost())) {
// The floater can't go here.
result = PR_FALSE;
break;
}
// See if there is now enough height for the floater.
if (y1 < mY + mAvailSpaceRect.height) {
// Winner. The bottom Y coordinate of the floater is in
// this band.
break;
}
}
// Restore Y coordinate and available space information
// regardless of the outcome.
mY = saveY;
GetAvailableSpace();
}
}
}
return result;
}
void
nsBlockReflowState::PlaceFloater(nsPlaceholderFrame* aPlaceholder,
PRBool* aIsLeftFloater,
nsPoint* aNewOrigin)
{
// Save away the Y coordinate before placing the floater. We will
// restore mY at the end after placing the floater. This is
// necessary because any adjustments to mY during the floater
// placement are for the floater only, not for any non-floating
// content.
nscoord saveY = mY;
nsIFrame* floater = aPlaceholder->GetAnchoredItem();
// Get the type of floater
const nsStyleDisplay* floaterDisplay;
const nsStyleSpacing* floaterSpacing;
floater->GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&)floaterDisplay);
floater->GetStyleData(eStyleStruct_Spacing,
(const nsStyleStruct*&)floaterSpacing);
// See if the floater should clear any preceeding floaters...
if (NS_STYLE_CLEAR_NONE != floaterDisplay->mBreakType) {
ClearFloaters(mY, floaterDisplay->mBreakType);
}
else {
// Get the band of available space
GetAvailableSpace();
}
// Get the floaters bounding box and margin information
nsRect region;
floater->GetRect(region);
// XXX sometimes when we reflow the floater we already have this value...
// XXX_performance fix this! It's slow!
nsSize kidAvailSize(mAvailSpaceRect.width, NS_UNCONSTRAINEDSIZE);
nsHTMLReflowState reflowState(mPresContext, mReflowState,
floater, kidAvailSize);
const nsMargin& floaterMargin = reflowState.computedMargin;
// Adjust the floater size by its margin. That's the area that will
// impact the space manager.
region.width += floaterMargin.left + floaterMargin.right;
region.height += floaterMargin.top + floaterMargin.bottom;
// Find a place to place the floater. The CSS2 spec doesn't want
// floaters overlapping each other or sticking out of the containing
// block if possible (CSS2 spec section 9.5.1, see the rule list).
NS_ASSERTION((NS_STYLE_FLOAT_LEFT == floaterDisplay->mFloats) ||
(NS_STYLE_FLOAT_RIGHT == floaterDisplay->mFloats),
"invalid float type");
// While there is not enough room for the floater, clear past other
// floaters until there is room (or the band is not impacted by a
// floater).
//
// Note: The CSS2 spec says that floaters should be placed as high
// as possible.
while (!CanPlaceFloater(region, floaterDisplay->mFloats)) {
mY += mAvailSpaceRect.height;
GetAvailableSpace();
}
// Assign an x and y coordinate to the floater. Note that the x,y
// coordinates are computed <b>relative to the translation in the
// spacemanager</b> which means that the impacted region will be
// <b>inside</b> the border/padding area.
if (NS_STYLE_FLOAT_LEFT == floaterDisplay->mFloats) {
*aIsLeftFloater = PR_TRUE;
region.x = mAvailSpaceRect.x;
}
else {
*aIsLeftFloater = PR_FALSE;
region.x = mAvailSpaceRect.XMost() - region.width;
// In case the floater is too big, don't go past the left edge
if (region.x < mAvailSpaceRect.x) {
region.x = mAvailSpaceRect.x;
}
}
const nsMargin& borderPadding = BorderPadding();
region.y = mY - borderPadding.top;
if (region.y < 0) {
// CSS2 spec, 9.5.1 rule [4]: A floating box's outer top may not
// be higher than the top of its containing block.
// XXX It's not clear if it means the higher than the outer edge
// or the border edge or the inner edge?
region.y = 0;
}
// Place the floater in the space manager
mSpaceManager->AddRectRegion(floater, region);
// Set the origin of the floater frame, in frame coordinates. These
// coordinates are <b>not</b> relative to the spacemanager
// translation, therefore we have to factor in our border/padding.
nscoord x = borderPadding.left + floaterMargin.left + region.x;
nscoord y = borderPadding.top + floaterMargin.top + region.y;
floater->MoveTo(x, y);
if (aNewOrigin) {
aNewOrigin->x = x;
aNewOrigin->y = y;
}
// Now restore mY
mY = saveY;
#ifdef NOISY_INCREMENTAL_REFLOW
if (mReflowState.reason == eReflowReason_Incremental) {
nsRect r;
floater->GetRect(r);
nsFrame::IndentBy(stdout, gNoiseIndent);
printf("placed floater: ");
((nsFrame*)floater)->ListTag(stdout);
printf(" %d,%d,%d,%d\n", r.x, r.y, r.width, r.height);
}
#endif
}
/**
* Place below-current-line floaters.
*/
void
nsBlockReflowState::PlaceBelowCurrentLineFloaters(nsVoidArray* aFloaters,
PRBool aReflowFloaters)
{
NS_PRECONDITION(aFloaters->Count() > 0, "no floaters");
PRInt32 numFloaters = aFloaters->Count();
for (PRInt32 i = 0; i < numFloaters; i++) {
nsPlaceholderFrame* placeholderFrame = (nsPlaceholderFrame*)
aFloaters->ElementAt(i);
if (!IsLeftMostChild(placeholderFrame)) {
if (aReflowFloaters) {
// Before we can place it we have to reflow it
nsHTMLReflowMetrics metrics(nsnull);
mBlock->ReflowFloater(*this, placeholderFrame, metrics);
PRBool isLeftFloater;
nsPoint origin;
PlaceFloater(placeholderFrame, &isLeftFloater, &origin);
// Update the floater combined-area
// XXX SlideFrames will muck this up!
metrics.mCombinedArea.x += origin.x;
metrics.mCombinedArea.y += origin.y;
CombineRects(metrics.mCombinedArea, mFloaterCombinedArea);
}
else {
PRBool isLeftFloater;
PlaceFloater(placeholderFrame, &isLeftFloater, nsnull);
}
}
}
}
/**
* Place current-line floaters.
*/
void
nsBlockReflowState::PlaceCurrentLineFloaters(nsVoidArray* aFloaters)
{
NS_PRECONDITION(aFloaters->Count() > 0, "no floaters");
PRInt32 numFloaters = aFloaters->Count();
for (PRInt32 i = 0; i < numFloaters; i++) {
nsPlaceholderFrame* placeholderFrame = (nsPlaceholderFrame*)
aFloaters->ElementAt(i);
if (IsLeftMostChild(placeholderFrame)) {
PRBool isLeftFloater;
PlaceFloater(placeholderFrame, &isLeftFloater, nsnull);
}
}
}
void
nsBlockReflowState::ClearFloaters(nscoord aY, PRUint8 aBreakType)
{
#ifdef NOISY_INCREMENTAL_REFLOW
if (mReflowState.reason == eReflowReason_Incremental) {
nsFrame::IndentBy(stdout, gNoiseIndent);
printf("clear floaters: in: mY=%d aY=%d(%d)\n",
mY, aY, aY - BorderPadding().top);
}
#endif
const nsMargin& bp = BorderPadding();
nscoord newY = mCurrentBand.ClearFloaters(aY - bp.top, aBreakType);
mY = newY + bp.top;
GetAvailableSpace();
#ifdef NOISY_INCREMENTAL_REFLOW
if (mReflowState.reason == eReflowReason_Incremental) {
nsFrame::IndentBy(stdout, gNoiseIndent);
printf("clear floaters: out: mY=%d(%d)\n", mY, mY - bp.top);
}
#endif
}
//////////////////////////////////////////////////////////////////////
// Painting, event handling
PRIntn
nsBlockFrame::GetSkipSides() const
{
PRIntn skip = 0;
if (nsnull != mPrevInFlow) {
skip |= 1 << NS_SIDE_TOP;
}
if (nsnull != mNextInFlow) {
skip |= 1 << NS_SIDE_BOTTOM;
}
return skip;
}
#ifdef NOISY_DAMAGE_REPAIR
static void ComputeCombinedArea(nsLineBox* aLine,
nscoord aWidth, nscoord aHeight,
nsRect& aResult)
{
nscoord x0 = 0, y0 = 0, x1 = aWidth, y1 = aHeight;
while (nsnull != aLine) {
// Compute min and max x/y values for the reflowed frame's
// combined areas
nscoord x = aLine->mCombinedArea.x;
nscoord y = aLine->mCombinedArea.y;
nscoord xmost = x + aLine->mCombinedArea.width;
nscoord ymost = y + aLine->mCombinedArea.height;
if (x < x0) {
x0 = x;
}
if (xmost > x1) {
x1 = xmost;
}
if (y < y0) {
y0 = y;
}
if (ymost > y1) {
y1 = ymost;
}
aLine = aLine->mNext;
}
aResult.x = x0;
aResult.y = y0;
aResult.width = x1 - x0;
aResult.height = y1 - y0;
}
#endif
NS_IMETHODIMP
nsBlockFrame::Paint(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer)
{
#ifdef NOISY_DAMAGE_REPAIR
if (NS_FRAME_PAINT_LAYER_BACKGROUND == aWhichLayer) {
PRInt32 depth = GetDepth();
nsRect ca;
ComputeCombinedArea(mLines, mRect.width, mRect.height, ca);
nsFrame::IndentBy(stdout, depth);
ListTag(stdout);
printf(": bounds=%d,%d,%d,%d dirty=%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);
}
#endif
const nsStyleDisplay* disp = (const nsStyleDisplay*)
mStyleContext->GetStyleData(eStyleStruct_Display);
// Only paint the border and background if we're visible
if (disp->mVisible && (NS_FRAME_PAINT_LAYER_BACKGROUND == aWhichLayer) &&
(0 != mRect.width) && (0 != mRect.height)) {
PRIntn skipSides = GetSkipSides();
const nsStyleColor* color = (const nsStyleColor*)
mStyleContext->GetStyleData(eStyleStruct_Color);
const nsStyleSpacing* spacing = (const nsStyleSpacing*)
mStyleContext->GetStyleData(eStyleStruct_Spacing);
// Paint background and border
nsRect rect(0, 0, mRect.width, mRect.height);
nsCSSRendering::PaintBackground(aPresContext, aRenderingContext, this,
aDirtyRect, rect, *color, *spacing, 0, 0);
nsCSSRendering::PaintBorder(aPresContext, aRenderingContext, this,
aDirtyRect, rect, *spacing, mStyleContext,
skipSides);
}
// If overflow is hidden then set the clip rect so that children
// don't leak out of us
if (NS_STYLE_OVERFLOW_HIDDEN == disp->mOverflow) {
PRBool clipState;
aRenderingContext.PushState();
aRenderingContext.SetClipRect(nsRect(0, 0, mRect.width, mRect.height),
nsClipCombine_kIntersect, clipState);
}
// Child elements have the opportunity to override the visibility
// property and display even if the parent is hidden
if (NS_FRAME_PAINT_LAYER_FLOATERS == aWhichLayer) {
PaintFloaters(aPresContext, aRenderingContext, aDirtyRect);
}
PaintChildren(aPresContext, aRenderingContext, aDirtyRect, aWhichLayer);
if (NS_STYLE_OVERFLOW_HIDDEN == disp->mOverflow) {
PRBool clipState;
aRenderingContext.PopState(clipState);
}
return NS_OK;
}
void
nsBlockFrame::PaintFloaters(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect)
{
for (nsLineBox* line = mLines; nsnull != line; line = line->mNext) {
nsVoidArray* floaters = line->mFloaters;
if (nsnull == floaters) {
continue;
}
PRInt32 i, n = floaters->Count();
for (i = 0; i < n; i++) {
nsPlaceholderFrame* ph = (nsPlaceholderFrame*) floaters->ElementAt(i);
PaintChild(aPresContext, aRenderingContext, aDirtyRect,
ph->GetAnchoredItem(), NS_FRAME_PAINT_LAYER_BACKGROUND);
PaintChild(aPresContext, aRenderingContext, aDirtyRect,
ph->GetAnchoredItem(), NS_FRAME_PAINT_LAYER_FLOATERS);
PaintChild(aPresContext, aRenderingContext, aDirtyRect,
ph->GetAnchoredItem(), NS_FRAME_PAINT_LAYER_FOREGROUND);
}
}
}
void
nsBlockFrame::PaintChildren(nsIPresContext& aPresContext,
nsIRenderingContext& aRenderingContext,
const nsRect& aDirtyRect,
nsFramePaintLayer aWhichLayer)
{
#ifdef NOISY_DAMAGE_REPAIR
PRInt32 depth = 0;
if (NS_FRAME_PAINT_LAYER_BACKGROUND == aWhichLayer) {
depth = GetDepth();
}
#endif
for (nsLineBox* line = mLines; nsnull != line; line = line->mNext) {
// If the line has outside children or if the line intersects the
// dirty rect then paint the children in the line.
if ((NS_FRAME_OUTSIDE_CHILDREN & mState) ||
!((line->mCombinedArea.YMost() <= aDirtyRect.y) ||
(line->mCombinedArea.y >= aDirtyRect.YMost()))) {
#ifdef NOISY_DAMAGE_REPAIR
if (NS_FRAME_PAINT_LAYER_BACKGROUND == aWhichLayer) {
nsFrame::IndentBy(stdout, depth+1);
printf("draw line=%p bounds=%d,%d,%d,%d ca=%d,%d,%d,%d\n",
line, line->mBounds.x, line->mBounds.y,
line->mBounds.width, line->mBounds.height,
line->mCombinedArea.x, line->mCombinedArea.y,
line->mCombinedArea.width, line->mCombinedArea.height);
}
#endif
nsIFrame* kid = line->mFirstChild;
PRInt32 n = line->ChildCount();
while (--n >= 0) {
PaintChild(aPresContext, aRenderingContext, aDirtyRect, kid,
aWhichLayer);
kid->GetNextSibling(&kid);
}
}
#ifdef NOISY_DAMAGE_REPAIR
else {
if (NS_FRAME_PAINT_LAYER_BACKGROUND == aWhichLayer) {
nsFrame::IndentBy(stdout, depth+1);
printf("skip line=%p bounds=%d,%d,%d,%d ca=%d,%d,%d,%d\n",
line, line->mBounds.x, line->mBounds.y,
line->mBounds.width, line->mBounds.height,
line->mCombinedArea.x, line->mCombinedArea.y,
line->mCombinedArea.width, line->mCombinedArea.height);
}
}
#endif
}
if (NS_FRAME_PAINT_LAYER_FOREGROUND == aWhichLayer) {
if ((nsnull != mBullet) && HaveOutsideBullet()) {
// Paint outside bullets manually
PaintChild(aPresContext, aRenderingContext, aDirtyRect, mBullet,
aWhichLayer);
}
}
}
NS_IMETHODIMP
nsBlockFrame::GetFrameForPoint(const nsPoint& aPoint, nsIFrame** aFrame)
{
nsresult rv = GetFrameForPointUsing(aPoint, nsnull, aFrame);
if (NS_OK == rv) {
return NS_OK;
}
if (nsnull != mBullet) {
rv = GetFrameForPointUsing(aPoint, nsLayoutAtoms::bulletList, aFrame);
if (NS_OK == rv) {
return NS_OK;
}
}
if (mFloaters.NotEmpty()) {
rv = GetFrameForPointUsing(aPoint, nsLayoutAtoms::floaterList, aFrame);
if (NS_OK == rv) {
return NS_OK;
}
}
*aFrame = this;
return NS_ERROR_FAILURE;
}
//////////////////////////////////////////////////////////////////////
// Debugging
#ifdef NS_DEBUG
static PRBool
InLineList(nsLineBox* aLines, nsIFrame* aFrame)
{
while (nsnull != aLines) {
nsIFrame* frame = aLines->mFirstChild;
PRInt32 n = aLines->ChildCount();
while (--n >= 0) {
if (frame == aFrame) {
return PR_TRUE;
}
frame->GetNextSibling(&frame);
}
aLines = aLines->mNext;
}
return PR_FALSE;
}
static PRBool
InSiblingList(nsLineBox* aLine, nsIFrame* aFrame)
{
if (nsnull != aLine) {
nsIFrame* frame = aLine->mFirstChild;
while (nsnull != frame) {
if (frame == aFrame) {
return PR_TRUE;
}
frame->GetNextSibling(&frame);
}
}
return PR_FALSE;
}
PRBool
nsBlockFrame::IsChild(nsIFrame* aFrame)
{
nsIFrame* parent;
aFrame->GetParent(&parent);
if (parent != (nsIFrame*)this) {
return PR_FALSE;
}
if (InLineList(mLines, aFrame) && InSiblingList(mLines, aFrame)) {
return PR_TRUE;
}
if (InLineList(mOverflowLines, aFrame) &&
InSiblingList(mOverflowLines, aFrame)) {
return PR_TRUE;
}
return PR_FALSE;
}
#endif
NS_IMETHODIMP
nsBlockFrame::VerifyTree() const
{
// XXX rewrite this
return NS_OK;
}
//----------------------------------------------------------------------
NS_IMETHODIMP
nsBlockFrame::Init(nsIPresContext& aPresContext,
nsIContent* aContent,
nsIFrame* aParent,
nsIStyleContext* aContext,
nsIFrame* aPrevInFlow)
{
if (aPrevInFlow) {
// Copy over the block/area frame flags
nsBlockFrame* blockFrame = (nsBlockFrame*)aPrevInFlow;
SetFlags(blockFrame->mFlags);
}
nsresult rv = nsBlockFrameSuper::Init(aPresContext, aContent, aParent,
aContext, aPrevInFlow);
if (nsBlockReflowContext::IsHTMLParagraph(this)) {
mState |= NS_BLOCK_IS_HTML_PARAGRAPH;
}
return rv;
}
NS_IMETHODIMP
nsBlockFrame::SetInitialChildList(nsIPresContext& aPresContext,
nsIAtom* aListName,
nsIFrame* aChildList)
{
nsresult rv = NS_OK;
if (nsLayoutAtoms::floaterList == aListName) {
mFloaters.SetFrames(aChildList);
}
else {
rv = AppendNewFrames(aPresContext, aChildList);
if (NS_FAILED(rv)) {
return rv;
}
// Create 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).
const nsStyleDisplay* styleDisplay;
GetStyleData(eStyleStruct_Display, (const nsStyleStruct*&) styleDisplay);
if ((nsnull == mPrevInFlow) &&
(NS_STYLE_DISPLAY_LIST_ITEM == styleDisplay->mDisplay) &&
(nsnull == mBullet)) {
// Resolve style for the bullet frame
nsIStyleContext* kidSC;
aPresContext.ResolvePseudoStyleContextFor(mContent,
nsHTMLAtoms::mozListBulletPseudo,
mStyleContext, PR_FALSE, &kidSC);
// Create bullet frame
mBullet = new nsBulletFrame;
if (nsnull == mBullet) {
NS_RELEASE(kidSC);
return NS_ERROR_OUT_OF_MEMORY;
}
mBullet->Init(aPresContext, mContent, this, kidSC, nsnull);
NS_RELEASE(kidSC);
// If the list bullet frame should be positioned inside then add
// it to the flow now.
const nsStyleList* styleList;
GetStyleData(eStyleStruct_List, (const nsStyleStruct*&) styleList);
if (NS_STYLE_LIST_STYLE_POSITION_INSIDE == styleList->mListStylePosition) {
InsertNewFrames(aPresContext, mBullet, nsnull);
mState &= ~NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET;
}
else {
mState |= NS_BLOCK_FRAME_HAS_OUTSIDE_BULLET;
}
}
// Lookup up the two pseudo style contexts
if (nsnull == mPrevInFlow) {
aPresContext.
ProbePseudoStyleContextFor(mContent, nsHTMLAtoms::firstLinePseudo,
mStyleContext, PR_FALSE, &mFirstLineStyle);
aPresContext.
ProbePseudoStyleContextFor(mContent, nsHTMLAtoms::firstLetterPseudo,
(nsnull != mFirstLineStyle
? mFirstLineStyle
: mStyleContext),
PR_FALSE, &mFirstLetterStyle);
#ifdef NOISY_FIRST_LETTER
if (nsnull != mFirstLetterStyle) {
printf("block(%d)@%p: first-letter style found\n",
ContentIndexInContainer(this), this);
}
#endif
}
}
return NS_OK;
}
void
nsBlockFrame::RenumberLists()
{
// Setup initial list ordinal value
PRInt32 ordinal = 1;
nsIHTMLContent* hc;
if (mContent && (NS_OK == mContent->QueryInterface(kIHTMLContentIID, (void**) &hc))) {
nsHTMLValue value;
if (NS_CONTENT_ATTR_HAS_VALUE ==
hc->GetHTMLAttribute(nsHTMLAtoms::start, value)) {
if (eHTMLUnit_Integer == value.GetUnit()) {
ordinal = value.GetIntValue();
if (ordinal <= 0) {
ordinal = 1;
}
}
}
NS_RELEASE(hc);
}
// Get to first-in-flow
nsBlockFrame* block = this;
while (nsnull != block->mPrevInFlow) {
block = (nsBlockFrame*) block->mPrevInFlow;
}
// For each flow-block...
while (nsnull != block) {
// For each frame in the flow-block...
nsIFrame* frame = block->mLines ? block->mLines->mFirstChild : nsnull;
while (nsnull != frame) {
// If the frame is a list-item and the frame implements our
// block frame API then get it's bullet and set the list item
// ordinal.
const nsStyleDisplay* display;
frame->GetStyleData(eStyleStruct_Display,
(const nsStyleStruct*&) display);
if (NS_STYLE_DISPLAY_LIST_ITEM == display->mDisplay) {
// Make certain that the frame isa block-frame in case
// something foriegn has crept in.
nsBlockFrame* listItem;
if (NS_OK == frame->QueryInterface(kBlockFrameCID,
(void**) &listItem)) {
if (nsnull != listItem->mBullet) {
ordinal =
listItem->mBullet->SetListItemOrdinal(ordinal);
}
}
}
frame->GetNextSibling(&frame);
}
block = (nsBlockFrame*) block->mNextInFlow;
}
}
void
nsBlockFrame::ReflowBullet(nsBlockReflowState& aState,
nsHTMLReflowMetrics& aMetrics)
{
// Reflow the bullet now
nsSize availSize;
availSize.width = NS_UNCONSTRAINEDSIZE;
availSize.height = NS_UNCONSTRAINEDSIZE;
nsHTMLReflowState reflowState(aState.mPresContext, aState.mReflowState,
mBullet, availSize);
reflowState.lineLayout = aState.mLineLayout;
nsIHTMLReflow* htmlReflow;
nsresult rv = mBullet->QueryInterface(kIHTMLReflowIID, (void**)&htmlReflow);
if (NS_SUCCEEDED(rv)) {
nsReflowStatus status;
htmlReflow->WillReflow(aState.mPresContext);
htmlReflow->Reflow(aState.mPresContext, aMetrics, reflowState, status);
htmlReflow->DidReflow(aState.mPresContext, NS_FRAME_REFLOW_FINISHED);
}
// Place the bullet now; use its right margin to distance it
// from the rest of the frames in the line
const nsMargin& bp = aState.BorderPadding();
nscoord x = bp.left - reflowState.computedMargin.right - aMetrics.width;
// Approximate the bullets position; vertical alignment will provide
// the final vertical location.
nscoord y = bp.top;
mBullet->SetRect(nsRect(x, y, aMetrics.width, aMetrics.height));
}
//XXX get rid of this -- its slow
void
nsBlockFrame::BuildFloaterList()
{
nsIFrame* head = nsnull;
nsIFrame* current = nsnull;
nsLineBox* line = mLines;
while (nsnull != line) {
if (nsnull != line->mFloaters) {
nsVoidArray& array = *line->mFloaters;
PRInt32 i, n = array.Count();
for (i = 0; i < n; i++) {
nsPlaceholderFrame* ph = (nsPlaceholderFrame*) array[i];
nsIFrame* floater = ph->GetAnchoredItem();
if (nsnull == head) {
current = head = floater;
}
else {
current->SetNextSibling(floater);
current = floater;
}
}
}
line = line->mNext;
}
// Terminate end of floater list just in case a floater was removed
if (nsnull != current) {
current->SetNextSibling(nsnull);
}
mFloaters.SetFrames(head);
}
// XXX keep the text-run data in the first-in-flow of the block
// XXX Switch to an interface to pass to child frames -or- do the
// grovelling directly ourselves?
nsresult
nsBlockFrame::ComputeTextRuns(nsIPresContext& aPresContext)
{
// Destroy old run information first
nsTextRun::DeleteTextRuns(mTextRuns);
mTextRuns = nsnull;
nsLineLayout textRunThingy(aPresContext);
// Ask each child to find its text runs
nsLineBox* line = mLines;
while (nsnull != line) {
if (!line->IsBlock()) {
nsIFrame* frame = line->mFirstChild;
PRInt32 n = line->ChildCount();
while (--n >= 0) {
nsIHTMLReflow* hr;
if (NS_OK == frame->QueryInterface(kIHTMLReflowIID, (void**)&hr)) {
nsresult rv = hr->FindTextRuns(textRunThingy);
if (NS_OK != rv) {
return rv;
}
}
else {
// A frame that doesn't implement nsIHTMLReflow isn't text
// therefore it will end an open text run.
textRunThingy.EndTextRun();
}
frame->GetNextSibling(&frame);
}
}
else {
// A block frame isn't text therefore it will end an open text
// run.
textRunThingy.EndTextRun();
}
line = line->mNext;
}
textRunThingy.EndTextRun();
// Now take the text-runs away from the line layout engine.
mTextRuns = textRunThingy.TakeTextRuns();
return NS_OK;
}
//----------------------------------------------------------------------
nsresult
NS_NewAnonymousBlockFrame(nsIFrame*& aNewFrame)
{
nsBlockFrame* it = new nsAnonymousBlockFrame;
if (nsnull == it) {
return NS_ERROR_OUT_OF_MEMORY;
}
aNewFrame = it;
return NS_OK;
}
nsAnonymousBlockFrame::nsAnonymousBlockFrame()
{
}
nsAnonymousBlockFrame::~nsAnonymousBlockFrame()
{
}
NS_IMETHODIMP
nsAnonymousBlockFrame::AppendFrames(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList)
{
return mParent->AppendFrames(aPresContext, aPresShell, aListName,
aFrameList);
}
NS_IMETHODIMP
nsAnonymousBlockFrame::InsertFrames(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
return mParent->InsertFrames(aPresContext, aPresShell, aListName,
aPrevFrame, aFrameList);
}
NS_IMETHODIMP
nsAnonymousBlockFrame::RemoveFrame(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame)
{
return mParent->RemoveFrame(aPresContext, aPresShell, aListName,
aOldFrame);
}
nsresult
nsAnonymousBlockFrame::AppendFrames2(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aFrameList)
{
return nsAnonymousBlockFrameSuper::AppendFrames(aPresContext, aPresShell,
aListName, aFrameList);
}
nsresult
nsAnonymousBlockFrame::InsertFrames2(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList)
{
return nsAnonymousBlockFrameSuper::InsertFrames(aPresContext, aPresShell,
aListName, aPrevFrame,
aFrameList);
}
nsresult
nsAnonymousBlockFrame::RemoveFrame2(nsIPresContext& aPresContext,
nsIPresShell& aPresShell,
nsIAtom* aListName,
nsIFrame* aOldFrame)
{
return nsAnonymousBlockFrameSuper::RemoveFrame(aPresContext, aPresShell,
aListName, aOldFrame);
}
void
nsAnonymousBlockFrame::RemoveFirstFrame()
{
nsLineBox* line = mLines;
if (nsnull != line) {
nsIFrame* firstChild = line->mFirstChild;
// If the line has floaters on it, see if the frame being removed
// is a placeholder frame. If it is, then remove it from the lines
// floater array and from the block frames floater child list.
if (nsnull != line->mFloaters) {
// XXX UNTESTED!
nsPlaceholderFrame* placeholderFrame;
nsVoidArray& floaters = *line->mFloaters;
PRInt32 i, n = floaters.Count();
for (i = 0; i < n; i++) {
placeholderFrame = (nsPlaceholderFrame*) floaters[i];
if (firstChild == placeholderFrame) {
// Remove placeholder from the line's floater array
floaters.RemoveElementAt(i);
if (0 == floaters.Count()) {
delete line->mFloaters;
line->mFloaters = nsnull;
}
// Remove the floater from the block frames mFloaters list too
mFloaters.RemoveFrame(placeholderFrame->GetAnchoredItem());
break;
}
}
}
if (1 == line->mChildCount) {
// Remove line when last frame goes away
mLines = line->mNext;
delete line;
}
else {
// Remove frame from line and mark the line dirty
--line->mChildCount;
line->MarkDirty();
firstChild->GetNextSibling(&line->mFirstChild);
}
// Break linkage to next child after stolen frame
firstChild->SetNextSibling(nsnull);
}
#ifdef DEBUG
VerifyFrameCount(mLines);
#endif
}
void
nsAnonymousBlockFrame::RemoveFramesFrom(nsIFrame* aFrame)
{
nsLineBox* line = mLines;
if (nsnull != line) {
// Chop the child sibling list into two pieces
nsFrameList tmp(line->mFirstChild);
nsIFrame* prevSibling = tmp.GetPrevSiblingFor(aFrame);
if (nsnull != prevSibling) {
// Chop the sibling list into two pieces
prevSibling->SetNextSibling(nsnull);
nsLineBox* prevLine = nsnull;
while (nsnull != line) {
nsIFrame* frame = line->mFirstChild;
PRInt32 i, n = line->mChildCount;
PRBool done = PR_FALSE;
for (i = 0; i < n; i++) {
if (frame == aFrame) {
// We just found the target frame (and the line its in and
// the previous line)
if (frame == line->mFirstChild) {
// No more children on this line, so let it get removed
prevLine->mNext = nsnull;
}
else {
// The only frames that remain on this line are the
// frames preceeding aFrame. Adjust the count to
// indicate that fact.
line->mChildCount = i;
// Remove the lines that follow this line
prevLine = line;
line = line->mNext;
prevLine->mNext = nsnull;
}
done = PR_TRUE;
break;
}
frame->GetNextSibling(&frame);
}
if (done) {
break;
}
prevLine = line;
line = line->mNext;
}
}
// Remove all of the remaining lines
while (nsnull != line) {
nsLineBox* next = line->mNext;
delete line;
line = next;
}
}
#ifdef DEBUG
VerifyFrameCount(mLines);
#endif
}
#ifdef DEBUG
void
nsBlockFrame::VerifyFrameCount(nsLineBox* line)
{
if (line) {
// First add up the counts on each line
nsLineBox* line0 = line;
PRInt32 count = 0;
while (nsnull != line) {
count += line->mChildCount;
line = line->mNext;
}
// Then count the frames
PRInt32 frameCount = 0;
nsIFrame* frame = line0->mFirstChild;
while (nsnull != frame) {
frameCount++;
frame->GetNextSibling(&frame);
}
NS_ASSERTION(count == frameCount, "bad line list");
// Next: test that each line has right number of frames on it
line = line0;
nsLineBox* prevLine = nsnull;
while (nsnull != line) {
count = line->mChildCount;
frame = line->mFirstChild;
while (--count >= 0) {
frame->GetNextSibling(&frame);
}
prevLine = line;
line = line->mNext;
if ((nsnull != line) && (0 != line->mChildCount)) {
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()
{
PRBool haveOverflow = PR_FALSE;
nsBlockFrame* flow = (nsBlockFrame*) GetFirstInFlow();
while (nsnull != flow) {
if (nsnull != flow->mOverflowLines) {
NS_ASSERTION(nsnull != flow->mOverflowLines->mFirstChild,
"bad overflow list");
NS_ASSERTION(!haveOverflow, "two frames with overflow lists");
haveOverflow = PR_TRUE;
}
flow = (nsBlockFrame*) flow->mNextInFlow;
}
}
PRInt32
nsBlockFrame::GetDepth() const
{
PRInt32 depth = 0;
nsIFrame* parent = mParent;
while (nsnull != parent) {
parent->GetParent(&parent);
depth++;
}
return depth;
}
#endif
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