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fune/layout/generic/nsColumnSetFrame.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* rendering object for css3 multi-column layout */
#include "mozilla/Unused.h"
#include "gfxPrefs.h"
#include "nsColumnSetFrame.h"
#include "nsCSSRendering.h"
using namespace mozilla;
using namespace mozilla::layout;
class nsDisplayColumnRule : public nsDisplayItem {
public:
nsDisplayColumnRule(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame)
{
MOZ_COUNT_CTOR(nsDisplayColumnRule);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplayColumnRule() {
MOZ_COUNT_DTOR(nsDisplayColumnRule);
mBorderRenderers.Clear();
}
#endif
/**
* Returns the frame's visual overflow rect instead of the frame's bounds.
*/
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const override
{
*aSnap = false;
return static_cast<nsColumnSetFrame*>(mFrame)->
CalculateColumnRuleBounds(ToReferenceFrame());
}
virtual LayerState GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters) override;
virtual already_AddRefed<Layer> BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters) override;
virtual bool CreateWebRenderCommands(mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc,
mozilla::layers::WebRenderLayerManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder) override;
virtual void Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx) override;
NS_DISPLAY_DECL_NAME("ColumnRule", TYPE_COLUMN_RULE);
private:
nsTArray<nsCSSBorderRenderer> mBorderRenderers;
};
void
nsDisplayColumnRule::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx)
{
static_cast<nsColumnSetFrame*>(mFrame)->
CreateBorderRenderers(mBorderRenderers, aCtx, mVisibleRect, ToReferenceFrame());
for (auto iter = mBorderRenderers.begin(); iter != mBorderRenderers.end(); iter++) {
iter->DrawBorders();
}
}
LayerState
nsDisplayColumnRule::GetLayerState(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aParameters)
{
if (!gfxPrefs::LayersAllowColumnRuleLayers()) {
return LAYER_NONE;
}
RefPtr<gfxContext> screenRefCtx = gfxContext::CreateOrNull(
gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget().get());
static_cast<nsColumnSetFrame*>(mFrame)->
CreateBorderRenderers(mBorderRenderers, screenRefCtx, mVisibleRect, ToReferenceFrame());
if (mBorderRenderers.IsEmpty()) {
return LAYER_NONE;
}
return LAYER_ACTIVE;
}
already_AddRefed<nsDisplayItem::Layer>
nsDisplayColumnRule::BuildLayer(nsDisplayListBuilder* aBuilder,
LayerManager* aManager,
const ContainerLayerParameters& aContainerParameters)
{
return BuildDisplayItemLayer(aBuilder, aManager, aContainerParameters);
}
bool
nsDisplayColumnRule::CreateWebRenderCommands(mozilla::wr::DisplayListBuilder& aBuilder,
mozilla::wr::IpcResourceUpdateQueue& aResources,
const StackingContextHelper& aSc,
mozilla::layers::WebRenderLayerManager* aManager,
nsDisplayListBuilder* aDisplayListBuilder)
{
RefPtr<gfxContext> screenRefCtx = gfxContext::CreateOrNull(
gfxPlatform::GetPlatform()->ScreenReferenceDrawTarget().get());
static_cast<nsColumnSetFrame*>(mFrame)->
CreateBorderRenderers(mBorderRenderers, screenRefCtx, mVisibleRect, ToReferenceFrame());
if (mBorderRenderers.IsEmpty()) {
return true;
}
for (auto& renderer : mBorderRenderers) {
renderer.CreateWebRenderCommands(this, aBuilder, aResources, aSc);
}
return true;
}
/**
* Tracking issues:
*
* XXX cursor movement around the top and bottom of colums seems to make the editor
* lose the caret.
*
* XXX should we support CSS columns applied to table elements?
*/
nsContainerFrame*
NS_NewColumnSetFrame(nsIPresShell* aPresShell, nsStyleContext* aContext, nsFrameState aStateFlags)
{
nsColumnSetFrame* it = new (aPresShell) nsColumnSetFrame(aContext);
it->AddStateBits(aStateFlags | NS_BLOCK_MARGIN_ROOT);
return it;
}
NS_IMPL_FRAMEARENA_HELPERS(nsColumnSetFrame)
nsColumnSetFrame::nsColumnSetFrame(nsStyleContext* aContext)
: nsContainerFrame(aContext, kClassID)
, mLastBalanceBSize(NS_INTRINSICSIZE)
{
}
void
nsColumnSetFrame::ForEachColumnRule(const std::function<void(const nsRect& lineRect)>& aSetLineRect,
const nsPoint& aPt)
{
nsIFrame* child = mFrames.FirstChild();
if (!child)
return; // no columns
nsIFrame* nextSibling = child->GetNextSibling();
if (!nextSibling)
return; // 1 column only - this means no gap to draw on
const nsStyleColumn* colStyle = StyleColumn();
nscoord ruleWidth = colStyle->GetComputedColumnRuleWidth();
if (!ruleWidth)
return;
WritingMode wm = GetWritingMode();
bool isVertical = wm.IsVertical();
bool isRTL = !wm.IsBidiLTR();
nsRect contentRect = GetContentRectRelativeToSelf() + aPt;
nsSize ruleSize = isVertical ? nsSize(contentRect.width, ruleWidth)
: nsSize(ruleWidth, contentRect.height);
while (nextSibling) {
// The frame tree goes RTL in RTL.
// The |prevFrame| and |nextFrame| frames here are the visually preceding
// (left/above) and following (right/below) frames, not in logical writing-
// mode direction.
nsIFrame* prevFrame = isRTL ? nextSibling : child;
nsIFrame* nextFrame = isRTL ? child : nextSibling;
// Each child frame's position coordinates is actually relative to this
// nsColumnSetFrame.
// linePt will be at the top-left edge to paint the line.
nsPoint linePt;
if (isVertical) {
nscoord edgeOfPrev = prevFrame->GetRect().YMost() + aPt.y;
nscoord edgeOfNext = nextFrame->GetRect().Y() + aPt.y;
linePt = nsPoint(contentRect.x,
(edgeOfPrev + edgeOfNext - ruleSize.height) / 2);
} else {
nscoord edgeOfPrev = prevFrame->GetRect().XMost() + aPt.x;
nscoord edgeOfNext = nextFrame->GetRect().X() + aPt.x;
linePt = nsPoint((edgeOfPrev + edgeOfNext - ruleSize.width) / 2,
contentRect.y);
}
aSetLineRect(nsRect(linePt, ruleSize));
child = nextSibling;
nextSibling = nextSibling->GetNextSibling();
}
}
nsRect
nsColumnSetFrame::CalculateColumnRuleBounds(const nsPoint& aOffset)
{
nsRect combined;
ForEachColumnRule([&combined](const nsRect& aLineRect)
{
combined = combined.Union(aLineRect);
}, aOffset);
return combined;
}
void
nsColumnSetFrame::CreateBorderRenderers(nsTArray<nsCSSBorderRenderer>& aBorderRenderers,
gfxContext* aCtx,
const nsRect& aDirtyRect,
const nsPoint& aPt)
{
WritingMode wm = GetWritingMode();
bool isVertical = wm.IsVertical();
const nsStyleColumn* colStyle = StyleColumn();
uint8_t ruleStyle;
// Per spec, inset => ridge and outset => groove
if (colStyle->mColumnRuleStyle == NS_STYLE_BORDER_STYLE_INSET)
ruleStyle = NS_STYLE_BORDER_STYLE_RIDGE;
else if (colStyle->mColumnRuleStyle == NS_STYLE_BORDER_STYLE_OUTSET)
ruleStyle = NS_STYLE_BORDER_STYLE_GROOVE;
else
ruleStyle = colStyle->mColumnRuleStyle;
nsPresContext* presContext = PresContext();
nscoord ruleWidth = colStyle->GetComputedColumnRuleWidth();
if (!ruleWidth)
return;
aBorderRenderers.Clear();
nscolor ruleColor =
GetVisitedDependentColor(&nsStyleColumn::mColumnRuleColor);
// In order to re-use a large amount of code, we treat the column rule as a border.
// We create a new border style object and fill in all the details of the column rule as
// the left border. PaintBorder() does all the rendering for us, so we not
// only save an enormous amount of code but we'll support all the line styles that
// we support on borders!
nsStyleBorder border(presContext);
Sides skipSides;
if (isVertical) {
border.SetBorderWidth(eSideTop, ruleWidth);
border.SetBorderStyle(eSideTop, ruleStyle);
border.mBorderTopColor = StyleComplexColor::FromColor(ruleColor);
skipSides |= mozilla::eSideBitsLeftRight;
skipSides |= mozilla::eSideBitsBottom;
} else {
border.SetBorderWidth(eSideLeft, ruleWidth);
border.SetBorderStyle(eSideLeft, ruleStyle);
border.mBorderLeftColor = StyleComplexColor::FromColor(ruleColor);
skipSides |= mozilla::eSideBitsTopBottom;
skipSides |= mozilla::eSideBitsRight;
}
// If we use box-decoration-break: slice (the default), the border
// renderers will require clipping if we have continuations (see the
// aNeedsClip parameter to ConstructBorderRenderer in nsCSSRendering).
//
// Since it doesn't matter which box-decoration-break we use since
// we're only drawing borders (and not border-images), use 'clone'.
border.mBoxDecorationBreak = StyleBoxDecorationBreak::Clone;
ForEachColumnRule([&]
(const nsRect& aLineRect)
{
// Assert that we're not drawing a border-image here; if we were, we
// couldn't ignore the ImgDrawResult that PaintBorderWithStyleBorder returns.
MOZ_ASSERT(border.mBorderImageSource.GetType() == eStyleImageType_Null);
gfx::DrawTarget* dt = aCtx ? aCtx->GetDrawTarget() : nullptr;
bool borderIsEmpty = false;
Maybe<nsCSSBorderRenderer> br =
nsCSSRendering::CreateBorderRendererWithStyleBorder(presContext, dt,
this, aDirtyRect,
aLineRect, border,
StyleContext(),
&borderIsEmpty,
skipSides);
if (br.isSome()) {
MOZ_ASSERT(!borderIsEmpty);
aBorderRenderers.AppendElement(br.value());
}
}, aPt);
}
static nscoord
GetAvailableContentISize(const ReflowInput& aReflowInput)
{
if (aReflowInput.AvailableISize() == NS_INTRINSICSIZE) {
return NS_INTRINSICSIZE;
}
WritingMode wm = aReflowInput.GetWritingMode();
nscoord borderPaddingISize =
aReflowInput.ComputedLogicalBorderPadding().IStartEnd(wm);
return std::max(0, aReflowInput.AvailableISize() - borderPaddingISize);
}
nscoord
nsColumnSetFrame::GetAvailableContentBSize(const ReflowInput& aReflowInput)
{
if (aReflowInput.AvailableBSize() == NS_INTRINSICSIZE) {
return NS_INTRINSICSIZE;
}
WritingMode wm = aReflowInput.GetWritingMode();
LogicalMargin bp = aReflowInput.ComputedLogicalBorderPadding();
bp.ApplySkipSides(GetLogicalSkipSides(&aReflowInput));
bp.BEnd(wm) = aReflowInput.ComputedLogicalBorderPadding().BEnd(wm);
return std::max(0, aReflowInput.AvailableBSize() - bp.BStartEnd(wm));
}
static nscoord
GetColumnGap(nsColumnSetFrame* aFrame,
const nsStyleColumn* aColStyle)
{
if (eStyleUnit_Normal == aColStyle->mColumnGap.GetUnit())
return aFrame->StyleFont()->mFont.size;
if (eStyleUnit_Coord == aColStyle->mColumnGap.GetUnit()) {
nscoord colGap = aColStyle->mColumnGap.GetCoordValue();
NS_ASSERTION(colGap >= 0, "negative column gap");
return colGap;
}
NS_NOTREACHED("Unknown gap type");
return 0;
}
nsColumnSetFrame::ReflowConfig
nsColumnSetFrame::ChooseColumnStrategy(const ReflowInput& aReflowInput,
bool aForceAuto = false,
nscoord aFeasibleBSize = NS_INTRINSICSIZE,
nscoord aInfeasibleBSize = 0)
{
nscoord knownFeasibleBSize = aFeasibleBSize;
nscoord knownInfeasibleBSize = aInfeasibleBSize;
WritingMode wm = aReflowInput.GetWritingMode();
const nsStyleColumn* colStyle = StyleColumn();
nscoord availContentISize = GetAvailableContentISize(aReflowInput);
if (aReflowInput.ComputedISize() != NS_INTRINSICSIZE) {
availContentISize = aReflowInput.ComputedISize();
}
nscoord consumedBSize = ConsumedBSize(wm);
// The effective computed height is the height of the current continuation
// of the column set frame. This should be the same as the computed height
// if we have an unconstrained available height.
nscoord computedBSize = GetEffectiveComputedBSize(aReflowInput,
consumedBSize);
nscoord colBSize = GetAvailableContentBSize(aReflowInput);
if (aReflowInput.ComputedBSize() != NS_INTRINSICSIZE) {
colBSize = aReflowInput.ComputedBSize();
} else if (aReflowInput.ComputedMaxBSize() != NS_INTRINSICSIZE) {
colBSize = std::min(colBSize, aReflowInput.ComputedMaxBSize());
}
nscoord colGap = GetColumnGap(this, colStyle);
int32_t numColumns = colStyle->mColumnCount;
// If column-fill is set to 'balance', then we want to balance the columns.
const bool isBalancing = colStyle->mColumnFill == NS_STYLE_COLUMN_FILL_BALANCE
&& !aForceAuto;
if (isBalancing) {
const uint32_t MAX_NESTED_COLUMN_BALANCING = 2;
uint32_t cnt = 0;
for (const ReflowInput* rs = aReflowInput.mParentReflowInput;
rs && cnt < MAX_NESTED_COLUMN_BALANCING; rs = rs->mParentReflowInput) {
if (rs->mFlags.mIsColumnBalancing) {
++cnt;
}
}
if (cnt == MAX_NESTED_COLUMN_BALANCING) {
numColumns = 1;
}
}
nscoord colISize;
// In vertical writing-mode, "column-width" (inline size) will actually be
// physical height, but its CSS name is still column-width.
if (colStyle->mColumnWidth.GetUnit() == eStyleUnit_Coord) {
colISize = colStyle->mColumnWidth.GetCoordValue();
NS_ASSERTION(colISize >= 0, "negative column width");
// Reduce column count if necessary to make columns fit in the
// available width. Compute max number of columns that fit in
// availContentISize, satisfying colGap*(maxColumns - 1) +
// colISize*maxColumns <= availContentISize
if (availContentISize != NS_INTRINSICSIZE && colGap + colISize > 0
&& numColumns > 0) {
// This expression uses truncated rounding, which is what we
// want
int32_t maxColumns =
std::min(nscoord(nsStyleColumn::kMaxColumnCount),
(availContentISize + colGap) / (colGap + colISize));
numColumns = std::max(1, std::min(numColumns, maxColumns));
}
} else if (numColumns > 0 && availContentISize != NS_INTRINSICSIZE) {
nscoord iSizeMinusGaps = availContentISize - colGap * (numColumns - 1);
colISize = iSizeMinusGaps / numColumns;
} else {
colISize = NS_INTRINSICSIZE;
}
// Take care of the situation where there's only one column but it's
// still too wide
colISize = std::max(1, std::min(colISize, availContentISize));
nscoord expectedISizeLeftOver = 0;
if (colISize != NS_INTRINSICSIZE && availContentISize != NS_INTRINSICSIZE) {
// distribute leftover space
// First, determine how many columns will be showing if the column
// count is auto
if (numColumns <= 0) {
// choose so that colGap*(nominalColumnCount - 1) +
// colISize*nominalColumnCount is nearly availContentISize
// make sure to round down
if (colGap + colISize > 0) {
numColumns = (availContentISize + colGap) / (colGap + colISize);
// The number of columns should never exceed kMaxColumnCount.
numColumns = std::min(nscoord(nsStyleColumn::kMaxColumnCount),
numColumns);
}
if (numColumns <= 0) {
numColumns = 1;
}
}
// Compute extra space and divide it among the columns
nscoord extraSpace =
std::max(0, availContentISize - (colISize * numColumns +
colGap * (numColumns - 1)));
nscoord extraToColumns = extraSpace / numColumns;
colISize += extraToColumns;
expectedISizeLeftOver = extraSpace - (extraToColumns * numColumns);
}
if (isBalancing) {
if (numColumns <= 0) {
// Hmm, auto column count, column width or available width is unknown,
// and balancing is required. Let's just use one column then.
numColumns = 1;
}
colBSize = std::min(mLastBalanceBSize, colBSize);
} else {
// This is the case when the column-fill property is set to 'auto'.
// No balancing, so don't limit the column count
numColumns = INT32_MAX;
// XXX_jwir3: If a page's height is set to 0, we could continually
// create continuations, resulting in an infinite loop, since
// no progress is ever made. This is an issue with the spec
// (css3-multicol, css3-page, and css3-break) that is
// unresolved as of 27 Feb 2013. For the time being, we set this
// to have a minimum of 1 css px. Once a resolution is made
// on what minimum to have for a page height, we may need to
// change this value to match the appropriate spec(s).
colBSize = std::max(colBSize, nsPresContext::CSSPixelsToAppUnits(1));
}
#ifdef DEBUG_roc
printf("*** nsColumnSetFrame::ChooseColumnStrategy: numColumns=%d, colISize=%d,"
" expectedISizeLeftOver=%d, colBSize=%d, colGap=%d\n",
numColumns, colISize, expectedISizeLeftOver, colBSize, colGap);
#endif
ReflowConfig config = { numColumns, colISize, expectedISizeLeftOver, colGap,
colBSize, isBalancing, knownFeasibleBSize,
knownInfeasibleBSize, computedBSize, consumedBSize };
return config;
}
static void
MarkPrincipalChildrenDirty(nsIFrame* aFrame)
{
for (nsIFrame* childFrame : aFrame->PrincipalChildList()) {
childFrame->AddStateBits(NS_FRAME_IS_DIRTY);
}
}
bool
nsColumnSetFrame::ReflowColumns(ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aReflowStatus,
ReflowConfig& aConfig,
bool aLastColumnUnbounded,
nsCollapsingMargin* aCarriedOutBEndMargin,
ColumnBalanceData& aColData)
{
bool feasible = ReflowChildren(aDesiredSize, aReflowInput,
aReflowStatus, aConfig, aLastColumnUnbounded,
aCarriedOutBEndMargin, aColData);
if (aColData.mHasExcessBSize) {
aConfig = ChooseColumnStrategy(aReflowInput, true);
// We need to reflow our children again one last time, otherwise we might
// end up with a stale column height for some of our columns, since we
// bailed out of balancing.
feasible = ReflowChildren(aDesiredSize, aReflowInput, aReflowStatus,
aConfig, aLastColumnUnbounded,
aCarriedOutBEndMargin, aColData);
}
return feasible;
}
static void MoveChildTo(nsIFrame* aChild, LogicalPoint aOrigin,
WritingMode aWM, const nsSize& aContainerSize)
{
if (aChild->GetLogicalPosition(aWM, aContainerSize) == aOrigin) {
return;
}
aChild->SetPosition(aWM, aOrigin, aContainerSize);
nsContainerFrame::PlaceFrameView(aChild);
}
nscoord
nsColumnSetFrame::GetMinISize(gfxContext *aRenderingContext)
{
nscoord iSize = 0;
DISPLAY_MIN_WIDTH(this, iSize);
if (mFrames.FirstChild()) {
iSize = mFrames.FirstChild()->GetMinISize(aRenderingContext);
}
const nsStyleColumn* colStyle = StyleColumn();
nscoord colISize;
if (colStyle->mColumnWidth.GetUnit() == eStyleUnit_Coord) {
colISize = colStyle->mColumnWidth.GetCoordValue();
// As available width reduces to zero, we reduce our number of columns
// to one, and don't enforce the column width, so just return the min
// of the child's min-width with any specified column width.
iSize = std::min(iSize, colISize);
} else {
NS_ASSERTION(colStyle->mColumnCount > 0,
"column-count and column-width can't both be auto");
// As available width reduces to zero, we still have mColumnCount columns,
// so multiply the child's min-width by the number of columns (n) and
// include n-1 column gaps.
colISize = iSize;
iSize *= colStyle->mColumnCount;
nscoord colGap = GetColumnGap(this, colStyle);
iSize += colGap * (colStyle->mColumnCount - 1);
// The multiplication above can make 'width' negative (integer overflow),
// so use std::max to protect against that.
iSize = std::max(iSize, colISize);
}
// XXX count forced column breaks here? Maybe we should return the child's
// min-width times the minimum number of columns.
return iSize;
}
nscoord
nsColumnSetFrame::GetPrefISize(gfxContext *aRenderingContext)
{
// Our preferred width is our desired column width, if specified, otherwise
// the child's preferred width, times the number of columns, plus the width
// of any required column gaps
// XXX what about forced column breaks here?
nscoord result = 0;
DISPLAY_PREF_WIDTH(this, result);
const nsStyleColumn* colStyle = StyleColumn();
nscoord colGap = GetColumnGap(this, colStyle);
nscoord colISize;
if (colStyle->mColumnWidth.GetUnit() == eStyleUnit_Coord) {
colISize = colStyle->mColumnWidth.GetCoordValue();
} else if (mFrames.FirstChild()) {
colISize = mFrames.FirstChild()->GetPrefISize(aRenderingContext);
} else {
colISize = 0;
}
int32_t numColumns = colStyle->mColumnCount;
if (numColumns <= 0) {
// if column-count is auto, assume one column
numColumns = 1;
}
nscoord iSize = colISize * numColumns + colGap * (numColumns - 1);
// The multiplication above can make 'iSize' negative (integer overflow),
// so use std::max to protect against that.
result = std::max(iSize, colISize);
return result;
}
bool
nsColumnSetFrame::ReflowChildren(ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus,
const ReflowConfig& aConfig,
bool aUnboundedLastColumn,
nsCollapsingMargin* aCarriedOutBEndMargin,
ColumnBalanceData& aColData)
{
aColData.Reset();
bool allFit = true;
WritingMode wm = GetWritingMode();
bool isRTL = !wm.IsBidiLTR();
bool shrinkingBSize = mLastBalanceBSize > aConfig.mColMaxBSize;
bool changingBSize = mLastBalanceBSize != aConfig.mColMaxBSize;
#ifdef DEBUG_roc
printf("*** Doing column reflow pass: mLastBalanceBSize=%d, mColMaxBSize=%d, RTL=%d\n"
" mBalanceColCount=%d, mColISize=%d, mColGap=%d\n",
mLastBalanceBSize, aConfig.mColMaxBSize, isRTL, aConfig.mBalanceColCount,
aConfig.mColISize, aConfig.mColGap);
#endif
DrainOverflowColumns();
const bool colBSizeChanged = mLastBalanceBSize != aConfig.mColMaxBSize;
if (colBSizeChanged) {
mLastBalanceBSize = aConfig.mColMaxBSize;
// XXX Seems like this could fire if incremental reflow pushed the column set
// down so we reflow incrementally with a different available height.
// We need a way to do an incremental reflow and be sure availableHeight
// changes are taken account of! Right now I think block frames with absolute
// children might exit early.
//NS_ASSERTION(aKidReason != eReflowReason_Incremental,
// "incremental reflow should not have changed the balance height");
}
// get our border and padding
LogicalMargin borderPadding = aReflowInput.ComputedLogicalBorderPadding();
borderPadding.ApplySkipSides(GetLogicalSkipSides(&aReflowInput));
nsRect contentRect(0, 0, 0, 0);
nsOverflowAreas overflowRects;
nsIFrame* child = mFrames.FirstChild();
LogicalPoint childOrigin(wm, borderPadding.IStart(wm),
borderPadding.BStart(wm));
// In vertical-rl mode, columns will not be correctly placed if the
// reflowInput's ComputedWidth() is UNCONSTRAINED (in which case we'll get
// a containerSize.width of zero here). In that case, the column positions
// will be adjusted later, after our correct contentSize is known.
nsSize containerSize = aReflowInput.ComputedSizeAsContainerIfConstrained();
// For RTL, since the columns might not fill the frame exactly, we
// need to account for the slop. Otherwise we'll waste time moving the
// columns by some tiny amount
// XXX when all of layout is converted to logical coordinates, we
// probably won't need to do this hack any more. For now, we
// confine it to the legacy horizontal-rl case
if (!wm.IsVertical() && isRTL) {
nscoord availISize = aReflowInput.AvailableISize();
if (aReflowInput.ComputedISize() != NS_INTRINSICSIZE) {
availISize = aReflowInput.ComputedISize();
}
if (availISize != NS_INTRINSICSIZE) {
childOrigin.I(wm) = containerSize.width - borderPadding.Left(wm) -
availISize;
#ifdef DEBUG_roc
printf("*** childOrigin.iCoord = %d\n", childOrigin.I(wm));
#endif
}
}
int columnCount = 0;
int contentBEnd = 0;
bool reflowNext = false;
while (child) {
// Try to skip reflowing the child. We can't skip if the child is dirty. We also can't
// skip if the next column is dirty, because the next column's first line(s)
// might be pullable back to this column. We can't skip if it's the last child
// because we need to obtain the bottom margin. We can't skip
// if this is the last column and we're supposed to assign unbounded
// height to it, because that could change the available height from
// the last time we reflowed it and we should try to pull all the
// content from its next sibling. (Note that it might be the last
// column, but not be the last child because the desired number of columns
// has changed.)
bool skipIncremental = !aReflowInput.ShouldReflowAllKids()
&& !NS_SUBTREE_DIRTY(child)
&& child->GetNextSibling()
&& !(aUnboundedLastColumn && columnCount == aConfig.mBalanceColCount - 1)
&& !NS_SUBTREE_DIRTY(child->GetNextSibling());
// If column-fill is auto (not the default), then we might need to
// move content between columns for any change in column block-size.
if (skipIncremental && changingBSize &&
StyleColumn()->mColumnFill == NS_STYLE_COLUMN_FILL_AUTO) {
skipIncremental = false;
}
// If we need to pull up content from the prev-in-flow then this is not just
// a height shrink. The prev in flow will have set the dirty bit.
// Check the overflow rect YMost instead of just the child's content height. The child
// may have overflowing content that cares about the available height boundary.
// (It may also have overflowing content that doesn't care about the available height
// boundary, but if so, too bad, this optimization is defeated.)
// We want scrollable overflow here since this is a calculation that
// affects layout.
if (skipIncremental && shrinkingBSize) {
switch (wm.GetBlockDir()) {
case WritingMode::eBlockTB:
if (child->GetScrollableOverflowRect().YMost() > aConfig.mColMaxBSize) {
skipIncremental = false;
}
break;
case WritingMode::eBlockLR:
if (child->GetScrollableOverflowRect().XMost() > aConfig.mColMaxBSize) {
skipIncremental = false;
}
break;
case WritingMode::eBlockRL:
// XXX not sure how to handle this, so for now just don't attempt
// the optimization
skipIncremental = false;
break;
default:
NS_NOTREACHED("unknown block direction");
break;
}
}
nscoord childContentBEnd = 0;
if (!reflowNext && skipIncremental) {
// This child does not need to be reflowed, but we may need to move it
MoveChildTo(child, childOrigin, wm, containerSize);
// If this is the last frame then make sure we get the right status
nsIFrame* kidNext = child->GetNextSibling();
if (kidNext) {
aStatus.Reset();
if (kidNext->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
aStatus.SetOverflowIncomplete();
} else {
aStatus.SetIncomplete();
}
} else {
aStatus = mLastFrameStatus;
}
childContentBEnd = nsLayoutUtils::CalculateContentBEnd(wm, child);
#ifdef DEBUG_roc
printf("*** Skipping child #%d %p (incremental %d): status = %d\n",
columnCount, (void*)child, skipIncremental, aStatus);
#endif
} else {
LogicalSize availSize(wm, aConfig.mColISize, aConfig.mColMaxBSize);
if (aUnboundedLastColumn && columnCount == aConfig.mBalanceColCount - 1) {
availSize.BSize(wm) = GetAvailableContentBSize(aReflowInput);
}
LogicalSize computedSize = aReflowInput.ComputedSize(wm);
if (reflowNext)
child->AddStateBits(NS_FRAME_IS_DIRTY);
LogicalSize kidCBSize(wm, availSize.ISize(wm), computedSize.BSize(wm));
ReflowInput kidReflowInput(PresContext(), aReflowInput, child,
availSize, &kidCBSize);
kidReflowInput.mFlags.mIsTopOfPage = true;
kidReflowInput.mFlags.mTableIsSplittable = false;
kidReflowInput.mFlags.mIsColumnBalancing = aConfig.mBalanceColCount < INT32_MAX;
// We need to reflow any float placeholders, even if our column height
// hasn't changed.
kidReflowInput.mFlags.mMustReflowPlaceholders = !colBSizeChanged;
#ifdef DEBUG_roc
printf("*** Reflowing child #%d %p: availHeight=%d\n",
columnCount, (void*)child,availSize.BSize(wm));
#endif
// Note if the column's next in flow is not being changed by this incremental reflow.
// This may allow the current column to avoid trying to pull lines from the next column.
if (child->GetNextSibling() &&
!(GetStateBits() & NS_FRAME_IS_DIRTY) &&
!(child->GetNextSibling()->GetStateBits() & NS_FRAME_IS_DIRTY)) {
kidReflowInput.mFlags.mNextInFlowUntouched = true;
}
ReflowOutput kidDesiredSize(wm, aDesiredSize.mFlags);
// XXX it would be cool to consult the float manager for the
// previous block to figure out the region of floats from the
// previous column that extend into this column, and subtract
// that region from the new float manager. So you could stick a
// really big float in the first column and text in following
// columns would flow around it.
// Reflow the frame
LogicalPoint origin(wm,
childOrigin.I(wm) +
kidReflowInput.ComputedLogicalMargin().IStart(wm),
childOrigin.B(wm) +
kidReflowInput.ComputedLogicalMargin().BStart(wm));
aStatus.Reset();
ReflowChild(child, PresContext(), kidDesiredSize, kidReflowInput,
wm, origin, containerSize, 0, aStatus);
reflowNext = aStatus.NextInFlowNeedsReflow();
#ifdef DEBUG_roc
printf("*** Reflowed child #%d %p: status = %d, desiredSize=%d,%d CarriedOutBEndMargin=%d\n",
columnCount, (void*)child, aStatus, kidDesiredSize.Width(), kidDesiredSize.Height(),
kidDesiredSize.mCarriedOutBEndMargin.get());
#endif
NS_FRAME_TRACE_REFLOW_OUT("Column::Reflow", aStatus);
*aCarriedOutBEndMargin = kidDesiredSize.mCarriedOutBEndMargin;
FinishReflowChild(child, PresContext(), kidDesiredSize,
&kidReflowInput, wm, childOrigin, containerSize, 0);
childContentBEnd = nsLayoutUtils::CalculateContentBEnd(wm, child);
if (childContentBEnd > aConfig.mColMaxBSize) {
allFit = false;
}
if (childContentBEnd > availSize.BSize(wm)) {
aColData.mMaxOverflowingBSize = std::max(childContentBEnd,
aColData.mMaxOverflowingBSize);
}
}
contentRect.UnionRect(contentRect, child->GetRect());
ConsiderChildOverflow(overflowRects, child);
contentBEnd = std::max(contentBEnd, childContentBEnd);
aColData.mLastBSize = childContentBEnd;
aColData.mSumBSize += childContentBEnd;
// Build a continuation column if necessary
nsIFrame* kidNextInFlow = child->GetNextInFlow();
if (aStatus.IsFullyComplete() && !aStatus.IsTruncated()) {
NS_ASSERTION(!kidNextInFlow, "next in flow should have been deleted");
child = nullptr;
break;
} else {
++columnCount;
// Make sure that the column has a next-in-flow. If not, we must
// create one to hold the overflowing stuff, even if we're just
// going to put it on our overflow list and let *our*
// next in flow handle it.
if (!kidNextInFlow) {
NS_ASSERTION(aStatus.NextInFlowNeedsReflow(),
"We have to create a continuation, but the block doesn't want us to reflow it?");
// We need to create a continuing column
kidNextInFlow = CreateNextInFlow(child);
}
// Make sure we reflow a next-in-flow when it switches between being
// normal or overflow container
if (aStatus.IsOverflowIncomplete()) {
if (!(kidNextInFlow->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
aStatus.SetNextInFlowNeedsReflow();
reflowNext = true;
kidNextInFlow->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
}
}
else if (kidNextInFlow->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) {
aStatus.SetNextInFlowNeedsReflow();
reflowNext = true;
kidNextInFlow->RemoveStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
}
if ((contentBEnd > aReflowInput.ComputedMaxBSize() ||
contentBEnd > aReflowInput.ComputedBSize()) &&
aConfig.mBalanceColCount < INT32_MAX) {
// We overflowed vertically, but have not exceeded the number of
// columns. We're going to go into overflow columns now, so balancing
// no longer applies.
aColData.mHasExcessBSize = true;
}
if (columnCount >= aConfig.mBalanceColCount) {
// No more columns allowed here. Stop.
aStatus.SetNextInFlowNeedsReflow();
kidNextInFlow->AddStateBits(NS_FRAME_IS_DIRTY);
// Move any of our leftover columns to our overflow list. Our
// next-in-flow will eventually pick them up.
const nsFrameList& continuationColumns = mFrames.RemoveFramesAfter(child);
if (continuationColumns.NotEmpty()) {
SetOverflowFrames(continuationColumns);
}
child = nullptr;
break;
}
}
if (PresContext()->HasPendingInterrupt()) {
// Stop the loop now while |child| still points to the frame that bailed
// out. We could keep going here and condition a bunch of the code in
// this loop on whether there's an interrupt, or even just keep going and
// trying to reflow the blocks (even though we know they'll interrupt
// right after their first line), but stopping now is conceptually the
// simplest (and probably fastest) thing.
break;
}
// Advance to the next column
child = child->GetNextSibling();
if (child) {
childOrigin.I(wm) += aConfig.mColISize + aConfig.mColGap;
#ifdef DEBUG_roc
printf("*** NEXT CHILD ORIGIN.icoord = %d\n", childOrigin.I(wm));
#endif
}
}
if (PresContext()->CheckForInterrupt(this) &&
(GetStateBits() & NS_FRAME_IS_DIRTY)) {
// Mark all our kids starting with |child| dirty
// Note that this is a CheckForInterrupt call, not a HasPendingInterrupt,
// because we might have interrupted while reflowing |child|, and since
// we're about to add a dirty bit to |child| we need to make sure that
// |this| is scheduled to have dirty bits marked on it and its ancestors.
// Otherwise, when we go to mark dirty bits on |child|'s ancestors we'll
// bail out immediately, since it'll already have a dirty bit.
for (; child; child = child->GetNextSibling()) {
child->AddStateBits(NS_FRAME_IS_DIRTY);
}
}
aColData.mMaxBSize = contentBEnd;
LogicalSize contentSize = LogicalSize(wm, contentRect.Size());
contentSize.BSize(wm) = std::max(contentSize.BSize(wm), contentBEnd);
mLastFrameStatus = aStatus;
// Apply computed and min/max values
if (aConfig.mComputedBSize != NS_INTRINSICSIZE) {
if (aReflowInput.AvailableBSize() != NS_INTRINSICSIZE) {
contentSize.BSize(wm) = std::min(contentSize.BSize(wm),
aConfig.mComputedBSize);
} else {
contentSize.BSize(wm) = aConfig.mComputedBSize;
}
} else {
// We add the "consumed" block-size back in so that we're applying
// constraints to the correct bSize value, then subtract it again
// after we've finished with the min/max calculation. This prevents us from
// having a last continuation that is smaller than the min bSize. but which
// has prev-in-flows, trigger a larger bSize than actually required.
contentSize.BSize(wm) =
aReflowInput.ApplyMinMaxBSize(contentSize.BSize(wm),
aConfig.mConsumedBSize);
}
if (aReflowInput.ComputedISize() != NS_INTRINSICSIZE) {
contentSize.ISize(wm) = aReflowInput.ComputedISize();
} else {
contentSize.ISize(wm) =
aReflowInput.ApplyMinMaxISize(contentSize.ISize(wm));
}
contentSize.ISize(wm) += borderPadding.IStartEnd(wm);
contentSize.BSize(wm) += borderPadding.BStartEnd(wm);
aDesiredSize.SetSize(wm, contentSize);
aDesiredSize.mOverflowAreas = overflowRects;
aDesiredSize.UnionOverflowAreasWithDesiredBounds();
// In vertical-rl mode, make a second pass if necessary to reposition the
// columns with the correct container width. (In other writing modes,
// correct containerSize was not required for column positioning so we don't
// need this fixup.)
if (wm.IsVerticalRL() && containerSize.width != contentSize.Width(wm)) {
const nsSize finalContainerSize = aDesiredSize.PhysicalSize();
for (nsIFrame* child : mFrames) {
// Get the logical position as set previously using a provisional or
// dummy containerSize, and reset with the correct container size.
child->SetPosition(wm, child->GetLogicalPosition(wm, containerSize),
finalContainerSize);
}
}
#ifdef DEBUG_roc
printf("*** DONE PASS feasible=%d\n", allFit && aStatus.IsFullyComplete()
&& !aStatus.IsTruncated());
#endif
return allFit && aStatus.IsFullyComplete()
&& !aStatus.IsTruncated();
}
void
nsColumnSetFrame::DrainOverflowColumns()
{
// First grab the prev-in-flows overflows and reparent them to this
// frame.
nsPresContext* presContext = PresContext();
nsColumnSetFrame* prev = static_cast<nsColumnSetFrame*>(GetPrevInFlow());
if (prev) {
AutoFrameListPtr overflows(presContext, prev->StealOverflowFrames());
if (overflows) {
nsContainerFrame::ReparentFrameViewList(*overflows, prev, this);
mFrames.InsertFrames(this, nullptr, *overflows);
}
}
// Now pull back our own overflows and append them to our children.
// We don't need to reparent them since we're already their parent.
AutoFrameListPtr overflows(presContext, StealOverflowFrames());
if (overflows) {
// We're already the parent for these frames, so no need to set
// their parent again.
mFrames.AppendFrames(nullptr, *overflows);
}
}
void
nsColumnSetFrame::FindBestBalanceBSize(const ReflowInput& aReflowInput,
nsPresContext* aPresContext,
ReflowConfig& aConfig,
ColumnBalanceData& aColData,
ReflowOutput& aDesiredSize,
nsCollapsingMargin& aOutMargin,
bool& aUnboundedLastColumn,
bool& aRunWasFeasible,
nsReflowStatus& aStatus)
{
bool feasible = aRunWasFeasible;
nsMargin bp = aReflowInput.ComputedPhysicalBorderPadding();
bp.ApplySkipSides(GetSkipSides());
bp.bottom = aReflowInput.ComputedPhysicalBorderPadding().bottom;
nscoord availableContentBSize =
GetAvailableContentBSize(aReflowInput);
// Termination of the algorithm below is guaranteed because
// aConfig.knownFeasibleBSize - aConfig.knownInfeasibleBSize decreases in every
// iteration.
// We set this flag when we detect that we may contain a frame
// that can break anywhere (thus foiling the linear decrease-by-one
// search)
bool maybeContinuousBreakingDetected = false;
while (!aPresContext->HasPendingInterrupt()) {
nscoord lastKnownFeasibleBSize = aConfig.mKnownFeasibleBSize;
// Record what we learned from the last reflow
if (feasible) {
// maxBSize is feasible. Also, mLastBalanceBSize is feasible.
aConfig.mKnownFeasibleBSize = std::min(aConfig.mKnownFeasibleBSize,
aColData.mMaxBSize);
aConfig.mKnownFeasibleBSize = std::min(aConfig.mKnownFeasibleBSize,
mLastBalanceBSize);
// Furthermore, no height less than the height of the last
// column can ever be feasible. (We might be able to reduce the
// height of a non-last column by moving content to a later column,
// but we can't do that with the last column.)
if (mFrames.GetLength() == aConfig.mBalanceColCount) {
aConfig.mKnownInfeasibleBSize = std::max(aConfig.mKnownInfeasibleBSize,
aColData.mLastBSize - 1);
}
} else {
aConfig.mKnownInfeasibleBSize = std::max(aConfig.mKnownInfeasibleBSize,
mLastBalanceBSize);
// If a column didn't fit in its available height, then its current
// height must be the minimum height for unbreakable content in
// the column, and therefore no smaller height can be feasible.
aConfig.mKnownInfeasibleBSize = std::max(aConfig.mKnownInfeasibleBSize,
aColData.mMaxOverflowingBSize - 1);
if (aUnboundedLastColumn) {
// The last column is unbounded, so all content got reflowed, so the
// mColMaxBSize is feasible.
aConfig.mKnownFeasibleBSize = std::min(aConfig.mKnownFeasibleBSize,
aColData.mMaxBSize);
}
}
#ifdef DEBUG_roc
printf("*** nsColumnSetFrame::Reflow balancing knownInfeasible=%d knownFeasible=%d\n",
aConfig.mKnownInfeasibleBSize, aConfig.mKnownFeasibleBSize);
#endif
if (aConfig.mKnownInfeasibleBSize >= aConfig.mKnownFeasibleBSize - 1) {
// aConfig.mKnownFeasibleBSize is where we want to be
break;
}
if (aConfig.mKnownInfeasibleBSize >= availableContentBSize) {
break;
}
if (lastKnownFeasibleBSize - aConfig.mKnownFeasibleBSize == 1) {
// We decreased the feasible height by one twip only. This could
// indicate that there is a continuously breakable child frame
// that we are crawling through.
maybeContinuousBreakingDetected = true;
}
nscoord nextGuess = (aConfig.mKnownFeasibleBSize + aConfig.mKnownInfeasibleBSize)/2;
// The constant of 600 twips is arbitrary. It's about two line-heights.
if (aConfig.mKnownFeasibleBSize - nextGuess < 600 &&
!maybeContinuousBreakingDetected) {
// We're close to our target, so just try shrinking just the
// minimum amount that will cause one of our columns to break
// differently.
nextGuess = aConfig.mKnownFeasibleBSize - 1;
} else if (aUnboundedLastColumn) {
// Make a guess by dividing that into N columns. Add some slop
// to try to make it on the feasible side. The constant of
// 600 twips is arbitrary. It's about two line-heights.
nextGuess = aColData.mSumBSize/aConfig.mBalanceColCount + 600;
// Sanitize it
nextGuess = clamped(nextGuess, aConfig.mKnownInfeasibleBSize + 1,
aConfig.mKnownFeasibleBSize - 1);
} else if (aConfig.mKnownFeasibleBSize == NS_INTRINSICSIZE) {
// This can happen when we had a next-in-flow so we didn't
// want to do an unbounded height measuring step. Let's just increase
// from the infeasible height by some reasonable amount.
nextGuess = aConfig.mKnownInfeasibleBSize*2 + 600;
}
// Don't bother guessing more than our height constraint.
nextGuess = std::min(availableContentBSize, nextGuess);
#ifdef DEBUG_roc
printf("*** nsColumnSetFrame::Reflow balancing choosing next guess=%d\n", nextGuess);
#endif
aConfig.mColMaxBSize = nextGuess;
aUnboundedLastColumn = false;
MarkPrincipalChildrenDirty(this);
feasible = ReflowColumns(aDesiredSize, aReflowInput, aStatus, aConfig, false,
&aOutMargin, aColData);
if (!aConfig.mIsBalancing) {
// Looks like we had excess height when balancing, so we gave up on
// trying to balance.
break;
}
}
if (aConfig.mIsBalancing && !feasible &&
!aPresContext->HasPendingInterrupt()) {
// We may need to reflow one more time at the feasible height to
// get a valid layout.
bool skip = false;
if (aConfig.mKnownInfeasibleBSize >= availableContentBSize) {
aConfig.mColMaxBSize = availableContentBSize;
if (mLastBalanceBSize == availableContentBSize) {
skip = true;
}
} else {
aConfig.mColMaxBSize = aConfig.mKnownFeasibleBSize;
}
if (!skip) {
// If our height is unconstrained, make sure that the last column is
// allowed to have arbitrary height here, even though we were balancing.
// Otherwise we'd have to split, and it's not clear what we'd do with
// that.
MarkPrincipalChildrenDirty(this);
feasible = ReflowColumns(aDesiredSize, aReflowInput, aStatus, aConfig,
availableContentBSize == NS_UNCONSTRAINEDSIZE,
&aOutMargin, aColData);
}
}
aRunWasFeasible = feasible;
}
void
nsColumnSetFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus)
{
MarkInReflow();
// Don't support interruption in columns
nsPresContext::InterruptPreventer noInterrupts(aPresContext);
DO_GLOBAL_REFLOW_COUNT("nsColumnSetFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
// Our children depend on our block-size if we have a fixed block-size.
if (aReflowInput.ComputedBSize() != NS_AUTOHEIGHT) {
AddStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE);
} else {
RemoveStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE);
}
#ifdef DEBUG
nsFrameList::Enumerator oc(GetChildList(kOverflowContainersList));
for (; !oc.AtEnd(); oc.Next()) {
MOZ_ASSERT(!IS_TRUE_OVERFLOW_CONTAINER(oc.get()));
}
nsFrameList::Enumerator eoc(GetChildList(kExcessOverflowContainersList));
for (; !eoc.AtEnd(); eoc.Next()) {
MOZ_ASSERT(!IS_TRUE_OVERFLOW_CONTAINER(eoc.get()));
}
#endif
nsOverflowAreas ocBounds;
nsReflowStatus ocStatus;
if (GetPrevInFlow()) {
ReflowOverflowContainerChildren(aPresContext, aReflowInput, ocBounds, 0,
ocStatus);
}
//------------ Handle Incremental Reflow -----------------
// If inline size is unconstrained, set aForceAuto to true to allow
// the columns to expand in the inline direction. (This typically
// happens in orthogonal flows where the inline direction is the
// container's block direction).
ReflowConfig config =
ChooseColumnStrategy(aReflowInput,
aReflowInput.ComputedISize() == NS_UNCONSTRAINEDSIZE);
// If balancing, then we allow the last column to grow to unbounded
// height during the first reflow. This gives us a way to estimate
// what the average column height should be, because we can measure
// the heights of all the columns and sum them up. But don't do this
// if we have a next in flow because we don't want to suck all its
// content back here and then have to push it out again!
nsIFrame* nextInFlow = GetNextInFlow();
bool unboundedLastColumn = config.mIsBalancing && !nextInFlow;
nsCollapsingMargin carriedOutBottomMargin;
ColumnBalanceData colData;
colData.mHasExcessBSize = false;
bool feasible = ReflowColumns(aDesiredSize, aReflowInput, aStatus, config,
unboundedLastColumn, &carriedOutBottomMargin,
colData);
// If we're not balancing, then we're already done, since we should have
// reflown all of our children, and there is no need for a binary search to
// determine proper column height.
if (config.mIsBalancing && !aPresContext->HasPendingInterrupt()) {
FindBestBalanceBSize(aReflowInput, aPresContext, config, colData,
aDesiredSize, carriedOutBottomMargin,
unboundedLastColumn, feasible, aStatus);
}
if (aPresContext->HasPendingInterrupt() &&
aReflowInput.AvailableBSize() == NS_UNCONSTRAINEDSIZE) {
// In this situation, we might be lying about our reflow status, because
// our last kid (the one that got interrupted) was incomplete. Fix that.
aStatus.Reset();
}
NS_ASSERTION(aStatus.IsFullyComplete() ||
aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE,
"Column set should be complete if the available block-size is unconstrained");
// Merge overflow container bounds and status.
aDesiredSize.mOverflowAreas.UnionWith(ocBounds);
aStatus.MergeCompletionStatusFrom(ocStatus);
FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize, aReflowInput, aStatus, false);
aDesiredSize.mCarriedOutBEndMargin = carriedOutBottomMargin;
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}
void
nsColumnSetFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists)
{
DisplayBorderBackgroundOutline(aBuilder, aLists);
if (IsVisibleForPainting(aBuilder)) {
aLists.BorderBackground()->
AppendToTop(MakeDisplayItem<nsDisplayColumnRule>(aBuilder, this));
}
// Our children won't have backgrounds so it doesn't matter where we put them.
for (nsFrameList::Enumerator e(mFrames); !e.AtEnd(); e.Next()) {
BuildDisplayListForChild(aBuilder, e.get(), aLists);
}
}
void
nsColumnSetFrame::AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult)
{
// Everything in mFrames is continuations of the first thing in mFrames.
nsIFrame* column = mFrames.FirstChild();
// We might not have any columns, apparently?
if (!column) {
return;
}
MOZ_ASSERT(column->StyleContext()->GetPseudo() ==
nsCSSAnonBoxes::columnContent,
"What sort of child is this?");
aResult.AppendElement(OwnedAnonBox(column));
}
#ifdef DEBUG
void
nsColumnSetFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList)
{
MOZ_ASSERT(aListID != kPrincipalList || aChildList.OnlyChild(),
"initial principal child list must have exactly one child");
nsContainerFrame::SetInitialChildList(kPrincipalList, aChildList);
}
void
nsColumnSetFrame::AppendFrames(ChildListID aListID,
nsFrameList& aFrameList)
{
MOZ_CRASH("unsupported operation");
}
void
nsColumnSetFrame::InsertFrames(ChildListID aListID,
nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
MOZ_CRASH("unsupported operation");
}
void
nsColumnSetFrame::RemoveFrame(ChildListID aListID,
nsIFrame* aOldFrame)
{
MOZ_CRASH("unsupported operation");
}
#endif
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