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gecko-dev/layout/generic/nsGridContainerFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code is subject to the terms of the Mozilla Public License
* version 2.0 (the "License"). You can obtain a copy of the License at
* http://mozilla.org/MPL/2.0/. */
/* rendering object for CSS "display: grid | inline-grid" */
#include "nsGridContainerFrame.h"
#include <algorithm> // for std::stable_sort
#include <limits>
#include "mozilla/Function.h"
#include "mozilla/Maybe.h"
#include "mozilla/PodOperations.h" // for PodZero
#include "nsAbsoluteContainingBlock.h"
#include "nsAlgorithm.h" // for clamped()
#include "nsCSSAnonBoxes.h"
#include "nsCSSFrameConstructor.h"
#include "nsDataHashtable.h"
#include "nsDisplayList.h"
#include "nsHashKeys.h"
#include "nsIFrameInlines.h"
#include "nsPresContext.h"
#include "nsRenderingContext.h"
#include "nsReadableUtils.h"
#include "nsRuleNode.h"
#include "nsStyleContext.h"
#include "mozilla/dom/GridBinding.h"
using namespace mozilla;
typedef nsAbsoluteContainingBlock::AbsPosReflowFlags AbsPosReflowFlags;
typedef nsGridContainerFrame::TrackSize TrackSize;
const uint32_t nsGridContainerFrame::kTranslatedMaxLine =
uint32_t(nsStyleGridLine::kMaxLine - nsStyleGridLine::kMinLine);
const uint32_t nsGridContainerFrame::kAutoLine = kTranslatedMaxLine + 3457U;
typedef nsTHashtable< nsPtrHashKey<nsIFrame> > FrameHashtable;
// https://drafts.csswg.org/css-align-3/#baseline-sharing-group
enum BaselineSharingGroup
{
// NOTE Used as an array index so must be 0 and 1.
eFirst = 0,
eLast = 1,
};
static void
ReparentFrame(nsIFrame* aFrame, nsContainerFrame* aOldParent,
nsContainerFrame* aNewParent)
{
NS_ASSERTION(aOldParent == aFrame->GetParent(),
"Parent not consistent with expectations");
aFrame->SetParent(aNewParent);
// When pushing and pulling frames we need to check for whether any
// views need to be reparented
nsContainerFrame::ReparentFrameView(aFrame, aOldParent, aNewParent);
}
static void
ReparentFrames(nsFrameList& aFrameList, nsContainerFrame* aOldParent,
nsContainerFrame* aNewParent)
{
for (auto f : aFrameList) {
ReparentFrame(f, aOldParent, aNewParent);
}
}
static nscoord
ClampToCSSMaxBSize(nscoord aSize, const ReflowInput* aReflowInput)
{
auto maxSize = aReflowInput->ComputedMaxBSize();
if (MOZ_UNLIKELY(maxSize != NS_UNCONSTRAINEDSIZE)) {
MOZ_ASSERT(aReflowInput->ComputedMinBSize() <= maxSize);
aSize = std::min(aSize, maxSize);
}
return aSize;
}
// Same as above and set aStatus INCOMPLETE if aSize wasn't clamped.
// (If we clamp aSize it means our size is less than the break point,
// i.e. we're effectively breaking in our overflow, so we should leave
// aStatus as is (it will likely be set to OVERFLOW_INCOMPLETE later)).
static nscoord
ClampToCSSMaxBSize(nscoord aSize, const ReflowInput* aReflowInput,
nsReflowStatus* aStatus)
{
auto maxSize = aReflowInput->ComputedMaxBSize();
if (MOZ_UNLIKELY(maxSize != NS_UNCONSTRAINEDSIZE)) {
MOZ_ASSERT(aReflowInput->ComputedMinBSize() <= maxSize);
if (aSize < maxSize) {
NS_FRAME_SET_INCOMPLETE(*aStatus);
} else {
aSize = maxSize;
}
} else {
NS_FRAME_SET_INCOMPLETE(*aStatus);
}
return aSize;
}
static bool
IsPercentOfIndefiniteSize(const nsStyleCoord& aCoord, nscoord aPercentBasis)
{
return aPercentBasis == NS_UNCONSTRAINEDSIZE && aCoord.HasPercent();
}
static nscoord
ResolveToDefiniteSize(const nsStyleCoord& aCoord, nscoord aPercentBasis)
{
MOZ_ASSERT(aCoord.IsCoordPercentCalcUnit());
if (::IsPercentOfIndefiniteSize(aCoord, aPercentBasis)) {
return nscoord(0);
}
return std::max(nscoord(0),
nsRuleNode::ComputeCoordPercentCalc(aCoord, aPercentBasis));
}
enum class GridLineSide
{
eBeforeGridGap,
eAfterGridGap,
};
struct nsGridContainerFrame::TrackSize
{
void Initialize(nscoord aPercentageBasis,
const nsStyleCoord& aMinCoord,
const nsStyleCoord& aMaxCoord);
bool IsFrozen() const { return mState & eFrozen; }
#ifdef DEBUG
void Dump() const;
#endif
enum StateBits : uint16_t {
eAutoMinSizing = 0x1,
eMinContentMinSizing = 0x2,
eMaxContentMinSizing = 0x4,
eMinOrMaxContentMinSizing = eMinContentMinSizing | eMaxContentMinSizing,
eIntrinsicMinSizing = eMinOrMaxContentMinSizing | eAutoMinSizing,
eFlexMinSizing = 0x8, // not really used ATM due to a spec change
eAutoMaxSizing = 0x10,
eMinContentMaxSizing = 0x20,
eMaxContentMaxSizing = 0x40,
eAutoOrMaxContentMaxSizing = eAutoMaxSizing | eMaxContentMaxSizing,
eIntrinsicMaxSizing = eAutoOrMaxContentMaxSizing | eMinContentMaxSizing,
eFlexMaxSizing = 0x80,
eFrozen = 0x100,
eSkipGrowUnlimited1 = 0x200,
eSkipGrowUnlimited2 = 0x400,
eSkipGrowUnlimited = eSkipGrowUnlimited1 | eSkipGrowUnlimited2,
eBreakBefore = 0x800,
eFitContent = 0x1000,
};
static bool IsMinContent(const nsStyleCoord& aCoord)
{
return aCoord.GetUnit() == eStyleUnit_Enumerated &&
aCoord.GetIntValue() == NS_STYLE_GRID_TRACK_BREADTH_MIN_CONTENT;
}
nscoord mBase;
nscoord mLimit;
nscoord mPosition; // zero until we apply 'align/justify-content'
// mBaselineSubtreeSize is the size of a baseline-aligned subtree within
// this track. One subtree per baseline-sharing group (per track).
nscoord mBaselineSubtreeSize[2];
StateBits mState;
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(TrackSize::StateBits)
namespace mozilla {
template <>
struct IsPod<nsGridContainerFrame::TrackSize> : TrueType {};
}
void
nsGridContainerFrame::TrackSize::Initialize(nscoord aPercentageBasis,
const nsStyleCoord& aMinCoord,
const nsStyleCoord& aMaxCoord)
{
MOZ_ASSERT(mBase == 0 && mLimit == 0 && mState == 0,
"track size data is expected to be initialized to zero");
auto minSizeUnit = aMinCoord.GetUnit();
auto maxSizeUnit = aMaxCoord.GetUnit();
if (minSizeUnit == eStyleUnit_None) {
// This track is sized using fit-content(size) (represented in style system
// with minCoord=None,maxCoord=size). In layout, fit-content(size) behaves
// as minmax(auto, max-content), with 'size' as an additional upper-bound.
mState = eFitContent;
minSizeUnit = eStyleUnit_Auto;
maxSizeUnit = eStyleUnit_Enumerated; // triggers max-content sizing below
}
if (::IsPercentOfIndefiniteSize(aMinCoord, aPercentageBasis)) {
// https://drafts.csswg.org/css-grid/#valdef-grid-template-columns-percentage
// "If the inline or block size of the grid container is indefinite,
// <percentage> values relative to that size are treated as 'auto'."
minSizeUnit = eStyleUnit_Auto;
}
if (::IsPercentOfIndefiniteSize(aMaxCoord, aPercentageBasis)) {
maxSizeUnit = eStyleUnit_Auto;
}
// http://dev.w3.org/csswg/css-grid/#algo-init
switch (minSizeUnit) {
case eStyleUnit_FlexFraction:
case eStyleUnit_Auto:
mState |= eAutoMinSizing;
break;
case eStyleUnit_Enumerated:
mState |= IsMinContent(aMinCoord) ? eMinContentMinSizing
: eMaxContentMinSizing;
break;
default:
mBase = ::ResolveToDefiniteSize(aMinCoord, aPercentageBasis);
}
switch (maxSizeUnit) {
case eStyleUnit_Auto:
mState |= eAutoMaxSizing;
mLimit = NS_UNCONSTRAINEDSIZE;
break;
case eStyleUnit_Enumerated:
mState |= IsMinContent(aMaxCoord) ? eMinContentMaxSizing
: eMaxContentMaxSizing;
mLimit = NS_UNCONSTRAINEDSIZE;
break;
case eStyleUnit_FlexFraction:
mState |= eFlexMaxSizing;
mLimit = mBase;
break;
default:
mLimit = ::ResolveToDefiniteSize(aMaxCoord, aPercentageBasis);
if (mLimit < mBase) {
mLimit = mBase;
}
}
mBaselineSubtreeSize[BaselineSharingGroup::eFirst] = nscoord(0);
mBaselineSubtreeSize[BaselineSharingGroup::eLast] = nscoord(0);
}
/**
* Is aFrame1 a prev-continuation of aFrame2?
*/
static bool
IsPrevContinuationOf(nsIFrame* aFrame1, nsIFrame* aFrame2)
{
nsIFrame* prev = aFrame2;
while ((prev = prev->GetPrevContinuation())) {
if (prev == aFrame1) {
return true;
}
}
return false;
}
/**
* Moves all frames from aSrc into aDest such that the resulting aDest
* is still sorted in document content order and continuation order.
* Precondition: both |aSrc| and |aDest| must be sorted to begin with.
* @param aCommonAncestor a hint for nsLayoutUtils::CompareTreePosition
*/
static void
MergeSortedFrameLists(nsFrameList& aDest, nsFrameList& aSrc,
nsIContent* aCommonAncestor)
{
nsIFrame* dest = aDest.FirstChild();
for (nsIFrame* src = aSrc.FirstChild(); src; ) {
if (!dest) {
aDest.AppendFrames(nullptr, aSrc);
break;
}
nsIContent* srcContent = src->GetContent();
nsIContent* destContent = dest->GetContent();
int32_t result = nsLayoutUtils::CompareTreePosition(srcContent,
destContent,
aCommonAncestor);
if (MOZ_UNLIKELY(result == 0)) {
// NOTE: we get here when comparing ::before/::after for the same element.
if (MOZ_UNLIKELY(srcContent->IsGeneratedContentContainerForBefore())) {
if (MOZ_LIKELY(!destContent->IsGeneratedContentContainerForBefore()) ||
::IsPrevContinuationOf(src, dest)) {
result = -1;
}
} else if (MOZ_UNLIKELY(srcContent->IsGeneratedContentContainerForAfter())) {
if (MOZ_UNLIKELY(destContent->IsGeneratedContentContainerForAfter()) &&
::IsPrevContinuationOf(src, dest)) {
result = -1;
}
} else if (::IsPrevContinuationOf(src, dest)) {
result = -1;
}
}
if (result < 0) {
// src should come before dest
nsIFrame* next = src->GetNextSibling();
aSrc.RemoveFrame(src);
aDest.InsertFrame(nullptr, dest->GetPrevSibling(), src);
src = next;
} else {
dest = dest->GetNextSibling();
}
}
MOZ_ASSERT(aSrc.IsEmpty());
}
static void
MergeSortedFrameListsFor(nsFrameList& aDest, nsFrameList& aSrc,
nsContainerFrame* aParent)
{
MergeSortedFrameLists(aDest, aSrc, aParent->GetContent());
}
class nsGridContainerFrame::GridItemCSSOrderIterator
{
public:
enum OrderState { eUnknownOrder, eKnownOrdered, eKnownUnordered };
enum ChildFilter { eSkipPlaceholders, eIncludeAll };
GridItemCSSOrderIterator(nsIFrame* aGridContainer,
nsIFrame::ChildListID aListID,
ChildFilter aFilter = eSkipPlaceholders,
OrderState aState = eUnknownOrder)
: mChildren(aGridContainer->GetChildList(aListID))
, mArrayIndex(0)
, mGridItemIndex(0)
, mSkipPlaceholders(aFilter == eSkipPlaceholders)
#ifdef DEBUG
, mGridContainer(aGridContainer)
, mListID(aListID)
#endif
{
size_t count = 0;
bool isOrdered = aState != eKnownUnordered;
if (aState == eUnknownOrder) {
auto maxOrder = std::numeric_limits<int32_t>::min();
for (nsFrameList::Enumerator e(mChildren); !e.AtEnd(); e.Next()) {
++count;
int32_t order = e.get()->StylePosition()->mOrder;
if (order < maxOrder) {
isOrdered = false;
break;
}
maxOrder = order;
}
}
if (isOrdered) {
mEnumerator.emplace(mChildren);
} else {
count *= 2; // XXX somewhat arbitrary estimate for now...
mArray.emplace(count);
for (nsFrameList::Enumerator e(mChildren); !e.AtEnd(); e.Next()) {
mArray->AppendElement(e.get());
}
// XXX replace this with nsTArray::StableSort when bug 1147091 is fixed.
std::stable_sort(mArray->begin(), mArray->end(), IsCSSOrderLessThan);
}
if (mSkipPlaceholders) {
SkipPlaceholders();
}
}
nsIFrame* operator*() const
{
MOZ_ASSERT(!AtEnd());
if (mEnumerator) {
return mEnumerator->get();
}
return (*mArray)[mArrayIndex];
}
/**
* Return the child index of the current item, placeholders not counted.
* It's forbidden to call this method when the current frame is placeholder.
*/
size_t GridItemIndex() const
{
MOZ_ASSERT(!AtEnd());
MOZ_ASSERT((**this)->GetType() != nsGkAtoms::placeholderFrame,
"MUST not call this when at a placeholder");
return mGridItemIndex;
}
/**
* Skip over placeholder children.
*/
void SkipPlaceholders()
{
if (mEnumerator) {
for (; !mEnumerator->AtEnd(); mEnumerator->Next()) {
nsIFrame* child = mEnumerator->get();
if (child->GetType() != nsGkAtoms::placeholderFrame) {
return;
}
}
} else {
for (; mArrayIndex < mArray->Length(); ++mArrayIndex) {
nsIFrame* child = (*mArray)[mArrayIndex];
if (child->GetType() != nsGkAtoms::placeholderFrame) {
return;
}
}
}
}
bool AtEnd() const
{
MOZ_ASSERT(mEnumerator || mArrayIndex <= mArray->Length());
return mEnumerator ? mEnumerator->AtEnd() : mArrayIndex >= mArray->Length();
}
void Next()
{
#ifdef DEBUG
MOZ_ASSERT(!AtEnd());
nsFrameList list = mGridContainer->GetChildList(mListID);
MOZ_ASSERT(list.FirstChild() == mChildren.FirstChild() &&
list.LastChild() == mChildren.LastChild(),
"the list of child frames must not change while iterating!");
#endif
if (mSkipPlaceholders ||
(**this)->GetType() != nsGkAtoms::placeholderFrame) {
++mGridItemIndex;
}
if (mEnumerator) {
mEnumerator->Next();
} else {
++mArrayIndex;
}
if (mSkipPlaceholders) {
SkipPlaceholders();
}
}
void Reset(ChildFilter aFilter = eSkipPlaceholders)
{
if (mEnumerator) {
mEnumerator.reset();
mEnumerator.emplace(mChildren);
} else {
mArrayIndex = 0;
}
mGridItemIndex = 0;
mSkipPlaceholders = aFilter == eSkipPlaceholders;
if (mSkipPlaceholders) {
SkipPlaceholders();
}
}
bool ItemsAreAlreadyInOrder() const { return mEnumerator.isSome(); }
private:
static bool IsCSSOrderLessThan(nsIFrame* const& a, nsIFrame* const& b)
{ return a->StylePosition()->mOrder < b->StylePosition()->mOrder; }
nsFrameList mChildren;
// Used if child list is already in ascending 'order'.
Maybe<nsFrameList::Enumerator> mEnumerator;
// Used if child list is *not* in ascending 'order'.
Maybe<nsTArray<nsIFrame*>> mArray;
size_t mArrayIndex;
// The index of the current grid item (placeholders excluded).
size_t mGridItemIndex;
// Skip placeholder children in the iteration?
bool mSkipPlaceholders;
#ifdef DEBUG
nsIFrame* mGridContainer;
nsIFrame::ChildListID mListID;
#endif
};
/**
* A LineRange can be definite or auto - when it's definite it represents
* a consecutive set of tracks between a starting line and an ending line.
* Before it's definite it can also represent an auto position with a span,
* where mStart == kAutoLine and mEnd is the (non-zero positive) span.
* For normal-flow items, the invariant mStart < mEnd holds when both
* lines are definite.
*
* For abs.pos. grid items, mStart and mEnd may both be kAutoLine, meaning
* "attach this side to the grid container containing block edge".
* Additionally, mStart <= mEnd holds when both are definite (non-kAutoLine),
* i.e. the invariant is slightly relaxed compared to normal flow items.
*/
struct nsGridContainerFrame::LineRange
{
LineRange(int32_t aStart, int32_t aEnd)
: mUntranslatedStart(aStart), mUntranslatedEnd(aEnd)
{
#ifdef DEBUG
if (!IsAutoAuto()) {
if (IsAuto()) {
MOZ_ASSERT(aEnd >= nsStyleGridLine::kMinLine &&
aEnd <= nsStyleGridLine::kMaxLine, "invalid span");
} else {
MOZ_ASSERT(aStart >= nsStyleGridLine::kMinLine &&
aStart <= nsStyleGridLine::kMaxLine, "invalid start line");
MOZ_ASSERT(aEnd == int32_t(kAutoLine) ||
(aEnd >= nsStyleGridLine::kMinLine &&
aEnd <= nsStyleGridLine::kMaxLine), "invalid end line");
}
}
#endif
}
bool IsAutoAuto() const { return mStart == kAutoLine && mEnd == kAutoLine; }
bool IsAuto() const { return mStart == kAutoLine; }
bool IsDefinite() const { return mStart != kAutoLine; }
uint32_t Extent() const
{
MOZ_ASSERT(mEnd != kAutoLine, "Extent is undefined for abs.pos. 'auto'");
if (IsAuto()) {
MOZ_ASSERT(mEnd >= 1 && mEnd < uint32_t(nsStyleGridLine::kMaxLine),
"invalid span");
return mEnd;
}
return mEnd - mStart;
}
/**
* Resolve this auto range to start at aStart, making it definite.
* Precondition: this range IsAuto()
*/
void ResolveAutoPosition(uint32_t aStart, uint32_t aExplicitGridOffset)
{
MOZ_ASSERT(IsAuto(), "Why call me?");
mStart = aStart;
mEnd += aStart;
// Clamping to where kMaxLine is in the explicit grid, per
// http://dev.w3.org/csswg/css-grid/#overlarge-grids :
uint32_t translatedMax = aExplicitGridOffset + nsStyleGridLine::kMaxLine;
if (MOZ_UNLIKELY(mStart >= translatedMax)) {
mEnd = translatedMax;
mStart = mEnd - 1;
} else if (MOZ_UNLIKELY(mEnd > translatedMax)) {
mEnd = translatedMax;
}
}
/**
* Translate the lines to account for (empty) removed tracks. This method
* is only for grid items and should only be called after placement.
* aNumRemovedTracks contains a count for each line in the grid how many
* tracks were removed between the start of the grid and that line.
*/
void AdjustForRemovedTracks(const nsTArray<uint32_t>& aNumRemovedTracks)
{
MOZ_ASSERT(mStart != kAutoLine, "invalid resolved line for a grid item");
MOZ_ASSERT(mEnd != kAutoLine, "invalid resolved line for a grid item");
uint32_t numRemovedTracks = aNumRemovedTracks[mStart];
MOZ_ASSERT(numRemovedTracks == aNumRemovedTracks[mEnd],
"tracks that a grid item spans can't be removed");
mStart -= numRemovedTracks;
mEnd -= numRemovedTracks;
}
/**
* Translate the lines to account for (empty) removed tracks. This method
* is only for abs.pos. children and should only be called after placement.
* Same as for in-flow items, but we don't touch 'auto' lines here and we
* also need to adjust areas that span into the removed tracks.
*/
void AdjustAbsPosForRemovedTracks(const nsTArray<uint32_t>& aNumRemovedTracks)
{
if (mStart != nsGridContainerFrame::kAutoLine) {
mStart -= aNumRemovedTracks[mStart];
}
if (mEnd != nsGridContainerFrame::kAutoLine) {
MOZ_ASSERT(mStart == nsGridContainerFrame::kAutoLine ||
mEnd > mStart, "invalid line range");
mEnd -= aNumRemovedTracks[mEnd];
}
if (mStart == mEnd) {
mEnd = nsGridContainerFrame::kAutoLine;
}
}
/**
* Return the contribution of this line range for step 2 in
* http://dev.w3.org/csswg/css-grid/#auto-placement-algo
*/
uint32_t HypotheticalEnd() const { return mEnd; }
/**
* Given an array of track sizes, return the starting position and length
* of the tracks in this line range.
*/
void ToPositionAndLength(const nsTArray<TrackSize>& aTrackSizes,
nscoord* aPos, nscoord* aLength) const;
/**
* Given an array of track sizes, return the length of the tracks in this
* line range.
*/
nscoord ToLength(const nsTArray<TrackSize>& aTrackSizes) const;
/**
* Given an array of track sizes and a grid origin coordinate, adjust the
* abs.pos. containing block along an axis given by aPos and aLength.
* aPos and aLength should already be initialized to the grid container
* containing block for this axis before calling this method.
*/
void ToPositionAndLengthForAbsPos(const Tracks& aTracks,
nscoord aGridOrigin,
nscoord* aPos, nscoord* aLength) const;
/**
* @note We'll use the signed member while resolving definite positions
* to line numbers (1-based), which may become negative for implicit lines
* to the top/left of the explicit grid. PlaceGridItems() then translates
* the whole grid to a 0,0 origin and we'll use the unsigned member from
* there on.
*/
union {
uint32_t mStart;
int32_t mUntranslatedStart;
};
union {
uint32_t mEnd;
int32_t mUntranslatedEnd;
};
protected:
LineRange() {}
};
/**
* Helper class to construct a LineRange from translated lines.
* The ctor only accepts translated definite line numbers.
*/
struct nsGridContainerFrame::TranslatedLineRange : public LineRange
{
TranslatedLineRange(uint32_t aStart, uint32_t aEnd)
{
MOZ_ASSERT(aStart < aEnd && aEnd <= kTranslatedMaxLine);
mStart = aStart;
mEnd = aEnd;
}
};
/**
* A GridArea is the area in the grid for a grid item.
* The area is represented by two LineRanges, both of which can be auto
* (@see LineRange) in intermediate steps while the item is being placed.
* @see PlaceGridItems
*/
struct nsGridContainerFrame::GridArea
{
GridArea(const LineRange& aCols, const LineRange& aRows)
: mCols(aCols), mRows(aRows) {}
bool IsDefinite() const { return mCols.IsDefinite() && mRows.IsDefinite(); }
LineRange mCols;
LineRange mRows;
};
struct nsGridContainerFrame::GridItemInfo
{
/**
* Item state per axis.
*/
enum StateBits : uint8_t {
eIsFlexing = 0x1, // does the item span a flex track?
eFirstBaseline = 0x2, // participate in first-baseline alignment?
// ditto last-baseline, mutually exclusive w. eFirstBaseline
eLastBaseline = 0x4,
eIsBaselineAligned = eFirstBaseline | eLastBaseline,
// One of e[Self|Content]Baseline is set when eIsBaselineAligned is true
eSelfBaseline = 0x8, // is it *-self:[last-]baseline alignment?
// Ditto *-content:[last-]baseline. Mutually exclusive w. eSelfBaseline.
eContentBaseline = 0x10,
eAllBaselineBits = eIsBaselineAligned | eSelfBaseline | eContentBaseline,
};
explicit GridItemInfo(nsIFrame* aFrame,
const GridArea& aArea)
: mFrame(aFrame)
, mArea(aArea)
{
mState[eLogicalAxisBlock] = StateBits(0);
mState[eLogicalAxisInline] = StateBits(0);
mBaselineOffset[eLogicalAxisBlock] = nscoord(0);
mBaselineOffset[eLogicalAxisInline] = nscoord(0);
}
/**
* If the item is [align|justify]-self:[last-]baseline aligned in the given
* axis then set aBaselineOffset to the baseline offset and return aAlign.
* Otherwise, return a fallback alignment.
*/
uint8_t GetSelfBaseline(uint8_t aAlign, LogicalAxis aAxis,
nscoord* aBaselineOffset) const
{
MOZ_ASSERT(aAlign == NS_STYLE_ALIGN_BASELINE ||
aAlign == NS_STYLE_ALIGN_LAST_BASELINE);
if (!(mState[aAxis] & eSelfBaseline)) {
return aAlign == NS_STYLE_ALIGN_BASELINE ? NS_STYLE_ALIGN_SELF_START
: NS_STYLE_ALIGN_SELF_END;
}
*aBaselineOffset = mBaselineOffset[aAxis];
return aAlign;
}
#ifdef DEBUG
void Dump() const;
#endif
static bool IsStartRowLessThan(const GridItemInfo* a, const GridItemInfo* b)
{
return a->mArea.mRows.mStart < b->mArea.mRows.mStart;
}
nsIFrame* const mFrame;
GridArea mArea;
// Offset from the margin edge to the baseline (LogicalAxis index). It's from
// the start edge when eFirstBaseline is set, end edge otherwise. It's mutable
// since we update the value fairly late (just before reflowing the item).
mutable nscoord mBaselineOffset[2];
StateBits mState[2]; // state bits per axis (LogicalAxis index)
static_assert(mozilla::eLogicalAxisBlock == 0, "unexpected index value");
static_assert(mozilla::eLogicalAxisInline == 1, "unexpected index value");
};
using GridItemInfo = nsGridContainerFrame::GridItemInfo;
using ItemState = GridItemInfo::StateBits;
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(ItemState)
#ifdef DEBUG
void
nsGridContainerFrame::GridItemInfo::Dump() const
{
auto Dump1 = [this] (const char* aMsg, LogicalAxis aAxis) {
auto state = mState[aAxis];
if (!state) {
return;
}
printf("%s", aMsg);
if (state & ItemState::eIsFlexing) {
printf("flexing ");
}
if (state & ItemState::eFirstBaseline) {
printf("baseline %s-alignment ",
(state & ItemState::eSelfBaseline) ? "self" : "content");
}
if (state & ItemState::eLastBaseline) {
printf("last-baseline %s-alignment ",
(state & ItemState::eSelfBaseline) ? "self" : "content");
}
if (state & ItemState::eIsBaselineAligned) {
printf("%.2fpx", NSAppUnitsToFloatPixels(mBaselineOffset[aAxis],
AppUnitsPerCSSPixel()));
}
printf("\n");
};
printf("grid-row: %d %d\n", mArea.mRows.mStart, mArea.mRows.mEnd);
Dump1(" grid block-axis: ", eLogicalAxisBlock);
printf("grid-column: %d %d\n", mArea.mCols.mStart, mArea.mCols.mEnd);
Dump1(" grid inline-axis: ", eLogicalAxisInline);
}
#endif
/**
* Utility class to find line names. It provides an interface to lookup line
* names with a dynamic number of repeat(auto-fill/fit) tracks taken into
* account.
*/
class MOZ_STACK_CLASS nsGridContainerFrame::LineNameMap
{
public:
/**
* Create a LineNameMap.
* @param aGridTemplate is the grid-template-rows/columns data for this axis
* @param aNumRepeatTracks the number of actual tracks associated with
* a repeat(auto-fill/fit) track (zero or more), or zero if there is no
* specified repeat(auto-fill/fit) track
*/
LineNameMap(const nsStyleGridTemplate& aGridTemplate,
uint32_t aNumRepeatTracks)
: mLineNameLists(aGridTemplate.mLineNameLists)
, mRepeatAutoLineNameListBefore(aGridTemplate.mRepeatAutoLineNameListBefore)
, mRepeatAutoLineNameListAfter(aGridTemplate.mRepeatAutoLineNameListAfter)
, mRepeatAutoStart(aGridTemplate.HasRepeatAuto() ?
aGridTemplate.mRepeatAutoIndex : 0)
, mRepeatAutoEnd(mRepeatAutoStart + aNumRepeatTracks)
, mRepeatEndDelta(aGridTemplate.HasRepeatAuto() ?
int32_t(aNumRepeatTracks) - 1 :
0)
, mTemplateLinesEnd(mLineNameLists.Length() + mRepeatEndDelta)
, mHasRepeatAuto(aGridTemplate.HasRepeatAuto())
{
MOZ_ASSERT(mHasRepeatAuto || aNumRepeatTracks == 0);
MOZ_ASSERT(mRepeatAutoStart <= mLineNameLists.Length());
MOZ_ASSERT(!mHasRepeatAuto || mLineNameLists.Length() >= 2);
}
/**
* Find the aNth occurrence of aName, searching forward if aNth is positive,
* and in reverse if aNth is negative (aNth == 0 is invalid), starting from
* aFromIndex (not inclusive), and return a 1-based line number.
* Also take into account there is an unconditional match at aImplicitLine
* unless it's zero.
* Return zero if aNth occurrences can't be found. In that case, aNth has
* been decremented with the number of occurrences that were found (if any).
*
* E.g. to search for "A 2" forward from the start of the grid: aName is "A"
* aNth is 2 and aFromIndex is zero. To search for "A -2", aNth is -2 and
* aFromIndex is ExplicitGridEnd + 1 (which is the line "before" the last
* line when we're searching in reverse). For "span A 2", aNth is 2 when
* used on a grid-[row|column]-end property and -2 for a *-start property,
* and aFromIndex is the line (which we should skip) on the opposite property.
*/
uint32_t FindNamedLine(const nsString& aName, int32_t* aNth,
uint32_t aFromIndex, uint32_t aImplicitLine) const
{
MOZ_ASSERT(aNth && *aNth != 0);
if (*aNth > 0) {
return FindLine(aName, aNth, aFromIndex, aImplicitLine);
}
int32_t nth = -*aNth;
int32_t line = RFindLine(aName, &nth, aFromIndex, aImplicitLine);
*aNth = -nth;
return line;
}
private:
/**
* @see FindNamedLine, this function searches forward.
*/
uint32_t FindLine(const nsString& aName, int32_t* aNth,
uint32_t aFromIndex, uint32_t aImplicitLine) const
{
MOZ_ASSERT(aNth && *aNth > 0);
int32_t nth = *aNth;
const uint32_t end = mTemplateLinesEnd;
uint32_t line;
uint32_t i = aFromIndex;
for (; i < end; i = line) {
line = i + 1;
if (line == aImplicitLine || Contains(i, aName)) {
if (--nth == 0) {
return line;
}
}
}
if (aImplicitLine > i) {
// aImplicitLine is after the lines we searched above so it's last.
// (grid-template-areas has more tracks than grid-template-[rows|columns])
if (--nth == 0) {
return aImplicitLine;
}
}
MOZ_ASSERT(nth > 0, "should have returned a valid line above already");
*aNth = nth;
return 0;
}
/**
* @see FindNamedLine, this function searches in reverse.
*/
uint32_t RFindLine(const nsString& aName, int32_t* aNth,
uint32_t aFromIndex, uint32_t aImplicitLine) const
{
MOZ_ASSERT(aNth && *aNth > 0);
if (MOZ_UNLIKELY(aFromIndex == 0)) {
return 0; // There are no named lines beyond the start of the explicit grid.
}
--aFromIndex; // (shift aFromIndex so we can treat it as inclusive)
int32_t nth = *aNth;
// The implicit line may be beyond the explicit grid so we match
// this line first if it's within the mTemplateLinesEnd..aFromIndex range.
const uint32_t end = mTemplateLinesEnd;
if (aImplicitLine > end && aImplicitLine < aFromIndex) {
if (--nth == 0) {
return aImplicitLine;
}
}
for (uint32_t i = std::min(aFromIndex, end); i; --i) {
if (i == aImplicitLine || Contains(i - 1, aName)) {
if (--nth == 0) {
return i;
}
}
}
MOZ_ASSERT(nth > 0, "should have returned a valid line above already");
*aNth = nth;
return 0;
}
// Return true if aName exists at aIndex.
bool Contains(uint32_t aIndex, const nsString& aName) const
{
if (!mHasRepeatAuto) {
return mLineNameLists[aIndex].Contains(aName);
}
if (aIndex < mRepeatAutoEnd && aIndex >= mRepeatAutoStart &&
mRepeatAutoLineNameListBefore.Contains(aName)) {
return true;
}
if (aIndex <= mRepeatAutoEnd && aIndex > mRepeatAutoStart &&
mRepeatAutoLineNameListAfter.Contains(aName)) {
return true;
}
if (aIndex <= mRepeatAutoStart) {
return mLineNameLists[aIndex].Contains(aName) ||
(aIndex == mRepeatAutoEnd &&
mLineNameLists[aIndex + 1].Contains(aName));
}
return aIndex >= mRepeatAutoEnd &&
mLineNameLists[aIndex - mRepeatEndDelta].Contains(aName);
}
// Some style data references, for easy access.
const nsTArray<nsTArray<nsString>>& mLineNameLists;
const nsTArray<nsString>& mRepeatAutoLineNameListBefore;
const nsTArray<nsString>& mRepeatAutoLineNameListAfter;
// The index of the repeat(auto-fill/fit) track, or zero if there is none.
const uint32_t mRepeatAutoStart;
// The (hypothetical) index of the last such repeat() track.
const uint32_t mRepeatAutoEnd;
// The difference between mTemplateLinesEnd and mLineNameLists.Length().
const int32_t mRepeatEndDelta;
// The end of the line name lists with repeat(auto-fill/fit) tracks accounted
// for. It is equal to mLineNameLists.Length() when a repeat() track
// generates one track (making mRepeatEndDelta == 0).
const uint32_t mTemplateLinesEnd;
// True if there is a specified repeat(auto-fill/fit) track.
const bool mHasRepeatAuto;
};
/**
* Encapsulates CSS track-sizing functions.
*/
struct nsGridContainerFrame::TrackSizingFunctions
{
TrackSizingFunctions(const nsStyleGridTemplate& aGridTemplate,
const nsStyleCoord& aAutoMinSizing,
const nsStyleCoord& aAutoMaxSizing)
: mMinSizingFunctions(aGridTemplate.mMinTrackSizingFunctions)
, mMaxSizingFunctions(aGridTemplate.mMaxTrackSizingFunctions)
, mAutoMinSizing(aAutoMinSizing)
, mAutoMaxSizing(aAutoMaxSizing)
, mExplicitGridOffset(0)
, mRepeatAutoStart(aGridTemplate.HasRepeatAuto() ?
aGridTemplate.mRepeatAutoIndex : 0)
, mRepeatAutoEnd(mRepeatAutoStart)
, mRepeatEndDelta(0)
, mHasRepeatAuto(aGridTemplate.HasRepeatAuto())
{
MOZ_ASSERT(mMinSizingFunctions.Length() == mMaxSizingFunctions.Length());
MOZ_ASSERT(!mHasRepeatAuto ||
(mMinSizingFunctions.Length() >= 1 &&
mRepeatAutoStart < mMinSizingFunctions.Length()));
}
/**
* Initialize the number of auto-fill/fit tracks to use and return that.
* (zero if no auto-fill/fit track was specified)
*/
uint32_t InitRepeatTracks(const nsStyleCoord& aGridGap, nscoord aMinSize,
nscoord aSize, nscoord aMaxSize)
{
uint32_t repeatTracks =
CalculateRepeatFillCount(aGridGap, aMinSize, aSize, aMaxSize);
SetNumRepeatTracks(repeatTracks);
return repeatTracks;
}
uint32_t CalculateRepeatFillCount(const nsStyleCoord& aGridGap,
nscoord aMinSize,
nscoord aSize,
nscoord aMaxSize) const
{
if (!mHasRepeatAuto) {
return 0;
}
// Spec quotes are from https://drafts.csswg.org/css-grid/#repeat-notation
const uint32_t numTracks = mMinSizingFunctions.Length();
MOZ_ASSERT(numTracks >= 1, "expected at least the repeat() track");
nscoord maxFill = aSize != NS_UNCONSTRAINEDSIZE ? aSize : aMaxSize;
if (maxFill == NS_UNCONSTRAINEDSIZE && aMinSize == NS_UNCONSTRAINEDSIZE) {
// "Otherwise, the specified track list repeats only once."
return 1;
}
nscoord repeatTrackSize = 0;
// Note that the repeat() track size is included in |sum| in this loop.
nscoord sum = 0;
for (uint32_t i = 0; i < numTracks; ++i) {
// "treating each track as its max track sizing function if that is
// definite or as its minimum track sizing function otherwise"
// https://drafts.csswg.org/css-grid/#valdef-repeat-auto-fill
const auto& maxCoord = mMaxSizingFunctions[i];
const auto* coord = &maxCoord;
if (!coord->IsCoordPercentCalcUnit()) {
coord = &mMinSizingFunctions[i];
if (!coord->IsCoordPercentCalcUnit()) {
return 1;
}
}
nscoord trackSize = ::ResolveToDefiniteSize(*coord, aSize);
if (i == mRepeatAutoStart) {
// Use a minimum 1px for the repeat() track-size.
if (trackSize < AppUnitsPerCSSPixel()) {
trackSize = AppUnitsPerCSSPixel();
}
repeatTrackSize = trackSize;
}
sum += trackSize;
}
nscoord gridGap = ::ResolveToDefiniteSize(aGridGap, aSize);
if (numTracks > 1) {
// Add grid-gaps for all the tracks including the repeat() track.
sum += gridGap * (numTracks - 1);
}
nscoord available = maxFill != NS_UNCONSTRAINEDSIZE ? maxFill : aMinSize;
nscoord spaceToFill = available - sum;
if (spaceToFill <= 0) {
// "if any number of repetitions would overflow, then 1 repetition"
return 1;
}
// Calculate the max number of tracks that fits without overflow.
uint32_t numRepeatTracks = (spaceToFill / (repeatTrackSize + gridGap)) + 1;
if (maxFill == NS_UNCONSTRAINEDSIZE) {
// "Otherwise, if the grid container has a definite min size in
// the relevant axis, the number of repetitions is the largest possible
// positive integer that fulfills that minimum requirement."
++numRepeatTracks; // one more to ensure the grid is at least min-size
}
// Clamp the number of repeat tracks so that the last line <= kMaxLine.
// (note that |numTracks| already includes one repeat() track)
const uint32_t maxRepeatTracks = nsStyleGridLine::kMaxLine - numTracks;
return std::min(numRepeatTracks, maxRepeatTracks);
}
/**
* Compute the explicit grid end line number (in a zero-based grid).
* @param aGridTemplateAreasEnd 'grid-template-areas' end line in this axis
*/
uint32_t ComputeExplicitGridEnd(uint32_t aGridTemplateAreasEnd)
{
uint32_t end = NumExplicitTracks() + 1;
end = std::max(end, aGridTemplateAreasEnd);
end = std::min(end, uint32_t(nsStyleGridLine::kMaxLine));
return end;
}
const nsStyleCoord& MinSizingFor(uint32_t aTrackIndex) const
{
if (MOZ_UNLIKELY(aTrackIndex < mExplicitGridOffset)) {
return mAutoMinSizing;
}
uint32_t index = aTrackIndex - mExplicitGridOffset;
if (index >= mRepeatAutoStart) {
if (index < mRepeatAutoEnd) {
return mMinSizingFunctions[mRepeatAutoStart];
}
index -= mRepeatEndDelta;
}
return index < mMinSizingFunctions.Length() ?
mMinSizingFunctions[index] : mAutoMinSizing;
}
const nsStyleCoord& MaxSizingFor(uint32_t aTrackIndex) const
{
if (MOZ_UNLIKELY(aTrackIndex < mExplicitGridOffset)) {
return mAutoMaxSizing;
}
uint32_t index = aTrackIndex - mExplicitGridOffset;
if (index >= mRepeatAutoStart) {
if (index < mRepeatAutoEnd) {
return mMaxSizingFunctions[mRepeatAutoStart];
}
index -= mRepeatEndDelta;
}
return index < mMaxSizingFunctions.Length() ?
mMaxSizingFunctions[index] : mAutoMaxSizing;
}
uint32_t NumExplicitTracks() const
{
return mMinSizingFunctions.Length() + mRepeatEndDelta;
}
uint32_t NumRepeatTracks() const
{
return mRepeatAutoEnd - mRepeatAutoStart;
}
void SetNumRepeatTracks(uint32_t aNumRepeatTracks)
{
MOZ_ASSERT(mHasRepeatAuto || aNumRepeatTracks == 0);
mRepeatAutoEnd = mRepeatAutoStart + aNumRepeatTracks;
mRepeatEndDelta = mHasRepeatAuto ?
int32_t(aNumRepeatTracks) - 1 :
0;
}
// Some style data references, for easy access.
const nsTArray<nsStyleCoord>& mMinSizingFunctions;
const nsTArray<nsStyleCoord>& mMaxSizingFunctions;
const nsStyleCoord& mAutoMinSizing;
const nsStyleCoord& mAutoMaxSizing;
// Offset from the start of the implicit grid to the first explicit track.
uint32_t mExplicitGridOffset;
// The index of the repeat(auto-fill/fit) track, or zero if there is none.
const uint32_t mRepeatAutoStart;
// The (hypothetical) index of the last such repeat() track.
uint32_t mRepeatAutoEnd;
// The difference between mExplicitGridEnd and mMinSizingFunctions.Length().
int32_t mRepeatEndDelta;
// True if there is a specified repeat(auto-fill/fit) track.
const bool mHasRepeatAuto;
};
/**
* State for the tracks in one dimension.
*/
struct nsGridContainerFrame::Tracks
{
explicit Tracks(LogicalAxis aAxis)
: mAxis(aAxis)
, mCanResolveLineRangeSize(false)
{
mBaselineSubtreeAlign[BaselineSharingGroup::eFirst] = NS_STYLE_ALIGN_AUTO;
mBaselineSubtreeAlign[BaselineSharingGroup::eLast] = NS_STYLE_ALIGN_AUTO;
}
void Initialize(const TrackSizingFunctions& aFunctions,
const nsStyleCoord& aGridGap,
uint32_t aNumTracks,
nscoord aContentBoxSize);
/**
* Return true if aRange spans at least one track with an intrinsic sizing
* function and does not span any tracks with a <flex> max-sizing function.
* @param aRange the span of tracks to check
* @param aConstraint if MIN_ISIZE, treat a <flex> min-sizing as 'min-content'
* @param aState will be set to the union of the state bits of all the spanned
* tracks, unless a flex track is found - then it only contains
* the union of the tracks up to and including the flex track.
*/
bool HasIntrinsicButNoFlexSizingInRange(const LineRange& aRange,
IntrinsicISizeType aConstraint,
TrackSize::StateBits* aState) const;
// Some data we collect for aligning baseline-aligned items.
struct ItemBaselineData
{
uint32_t mBaselineTrack;
nscoord mBaseline;
nscoord mSize;
GridItemInfo* mGridItem;
static bool IsBaselineTrackLessThan(const ItemBaselineData& a,
const ItemBaselineData& b)
{
return a.mBaselineTrack < b.mBaselineTrack;
}
};
/**
* Calculate baseline offsets for the given set of items.
* Helper for InitialzeItemBaselines.
*/
void CalculateItemBaselines(nsTArray<ItemBaselineData>& aBaselineItems,
BaselineSharingGroup aBaselineGroup);
/**
* Initialize grid item baseline state and offsets.
*/
void InitializeItemBaselines(GridReflowInput& aState,
nsTArray<GridItemInfo>& aGridItems);
/**
* Apply the additional alignment needed to align the baseline-aligned subtree
* the item belongs to within its baseline track.
*/
void AlignBaselineSubtree(const GridItemInfo& aGridItem) const;
/**
* Resolve Intrinsic Track Sizes.
* http://dev.w3.org/csswg/css-grid/#algo-content
*/
void ResolveIntrinsicSize(GridReflowInput& aState,
nsTArray<GridItemInfo>& aGridItems,
const TrackSizingFunctions& aFunctions,
LineRange GridArea::* aRange,
nscoord aPercentageBasis,
IntrinsicISizeType aConstraint);
/**
* Helper for ResolveIntrinsicSize. It implements step 1 "size tracks to fit
* non-spanning items" in the spec. Return true if the track has a <flex>
* max-sizing function, false otherwise.
*/
bool ResolveIntrinsicSizeStep1(GridReflowInput& aState,
const TrackSizingFunctions& aFunctions,
nscoord aPercentageBasis,
IntrinsicISizeType aConstraint,
const LineRange& aRange,
const GridItemInfo& aGridItem);
/**
* Collect the tracks which are growable (matching aSelector) into
* aGrowableTracks, and return the amount of space that can be used
* to grow those tracks. Specifically, we return aAvailableSpace minus
* the sum of mBase's in aPlan (clamped to 0) for the tracks in aRange,
* or zero when there are no growable tracks.
* @note aPlan[*].mBase represents a planned new base or limit.
*/
static nscoord CollectGrowable(nscoord aAvailableSpace,
const nsTArray<TrackSize>& aPlan,
const LineRange& aRange,
TrackSize::StateBits aSelector,
nsTArray<uint32_t>& aGrowableTracks)
{
MOZ_ASSERT(aAvailableSpace > 0, "why call me?");
nscoord space = aAvailableSpace;
const uint32_t start = aRange.mStart;
const uint32_t end = aRange.mEnd;
for (uint32_t i = start; i < end; ++i) {
const TrackSize& sz = aPlan[i];
space -= sz.mBase;
if (space <= 0) {
return 0;
}
if ((sz.mState & aSelector) && !sz.IsFrozen()) {
aGrowableTracks.AppendElement(i);
}
}
return aGrowableTracks.IsEmpty() ? 0 : space;
}
void SetupGrowthPlan(nsTArray<TrackSize>& aPlan,
const nsTArray<uint32_t>& aTracks) const
{
for (uint32_t track : aTracks) {
aPlan[track] = mSizes[track];
}
}
void CopyPlanToBase(const nsTArray<TrackSize>& aPlan,
const nsTArray<uint32_t>& aTracks)
{
for (uint32_t track : aTracks) {
MOZ_ASSERT(mSizes[track].mBase <= aPlan[track].mBase);
mSizes[track].mBase = aPlan[track].mBase;
}
}
void CopyPlanToLimit(const nsTArray<TrackSize>& aPlan,
const nsTArray<uint32_t>& aTracks)
{
for (uint32_t track : aTracks) {
MOZ_ASSERT(mSizes[track].mLimit == NS_UNCONSTRAINEDSIZE ||
mSizes[track].mLimit <= aPlan[track].mBase);
mSizes[track].mLimit = aPlan[track].mBase;
}
}
using FitContentClamper =
function<bool(uint32_t aTrack, nscoord aMinSize, nscoord* aSize)>;
/**
* Grow the planned size for tracks in aGrowableTracks up to their limit
* and then freeze them (all aGrowableTracks must be unfrozen on entry).
* Subtract the space added from aAvailableSpace and return that.
*/
nscoord GrowTracksToLimit(nscoord aAvailableSpace,
nsTArray<TrackSize>& aPlan,
const nsTArray<uint32_t>& aGrowableTracks,
FitContentClamper aFitContentClamper) const
{
MOZ_ASSERT(aAvailableSpace > 0 && aGrowableTracks.Length() > 0);
nscoord space = aAvailableSpace;
uint32_t numGrowable = aGrowableTracks.Length();
while (true) {
nscoord spacePerTrack = std::max<nscoord>(space / numGrowable, 1);
for (uint32_t track : aGrowableTracks) {
TrackSize& sz = aPlan[track];
if (sz.IsFrozen()) {
continue;
}
nscoord newBase = sz.mBase + spacePerTrack;
nscoord limit = sz.mLimit;
if (MOZ_UNLIKELY((sz.mState & TrackSize::eFitContent) &&
aFitContentClamper)) {
// Clamp the limit to the fit-content() size, for §12.5.2 step 5/6.
aFitContentClamper(track, sz.mBase, &limit);
}
if (newBase > limit) {
nscoord consumed = limit - sz.mBase;
if (consumed > 0) {
space -= consumed;
sz.mBase = limit;
}
sz.mState |= TrackSize::eFrozen;
if (--numGrowable == 0) {
return space;
}
} else {
sz.mBase = newBase;
space -= spacePerTrack;
}
MOZ_ASSERT(space >= 0);
if (space == 0) {
return 0;
}
}
}
MOZ_ASSERT_UNREACHABLE("we don't exit the loop above except by return");
return 0;
}
/**
* Helper for GrowSelectedTracksUnlimited. For the set of tracks (S) that
* match aMinSizingSelector: if a track in S doesn't match aMaxSizingSelector
* then mark it with aSkipFlag. If all tracks in S were marked then unmark
* them. Return aNumGrowable minus the number of tracks marked. It is
* assumed that aPlan have no aSkipFlag set for tracks in aGrowableTracks
* on entry to this method.
*/
uint32_t MarkExcludedTracks(nsTArray<TrackSize>& aPlan,
uint32_t aNumGrowable,
const nsTArray<uint32_t>& aGrowableTracks,
TrackSize::StateBits aMinSizingSelector,
TrackSize::StateBits aMaxSizingSelector,
TrackSize::StateBits aSkipFlag) const
{
bool foundOneSelected = false;
bool foundOneGrowable = false;
uint32_t numGrowable = aNumGrowable;
for (uint32_t track : aGrowableTracks) {
TrackSize& sz = aPlan[track];
const auto state = sz.mState;
if (state & aMinSizingSelector) {
foundOneSelected = true;
if (state & aMaxSizingSelector) {
foundOneGrowable = true;
continue;
}
sz.mState |= aSkipFlag;
MOZ_ASSERT(numGrowable != 0);
--numGrowable;
}
}
// 12.5 "if there are no such tracks, then all affected tracks"
if (foundOneSelected && !foundOneGrowable) {
for (uint32_t track : aGrowableTracks) {
aPlan[track].mState &= ~aSkipFlag;
}
numGrowable = aNumGrowable;
}
return numGrowable;
}
/**
* Increase the planned size for tracks in aGrowableTracks that match
* aSelector (or all tracks if aSelector is zero) beyond their limit.
* This implements the "Distribute space beyond growth limits" step in
* https://drafts.csswg.org/css-grid/#distribute-extra-space
*/
void GrowSelectedTracksUnlimited(nscoord aAvailableSpace,
nsTArray<TrackSize>& aPlan,
const nsTArray<uint32_t>& aGrowableTracks,
TrackSize::StateBits aSelector,
FitContentClamper aFitContentClamper) const
{
MOZ_ASSERT(aAvailableSpace > 0 && aGrowableTracks.Length() > 0);
uint32_t numGrowable = aGrowableTracks.Length();
if (aSelector) {
DebugOnly<TrackSize::StateBits> withoutFlexMin =
TrackSize::StateBits(aSelector & ~TrackSize::eFlexMinSizing);
MOZ_ASSERT(withoutFlexMin == TrackSize::eIntrinsicMinSizing ||
withoutFlexMin == TrackSize::eMinOrMaxContentMinSizing ||
withoutFlexMin == TrackSize::eMaxContentMinSizing);
// Note that eMaxContentMinSizing is always included. We do those first:
numGrowable = MarkExcludedTracks(aPlan, numGrowable, aGrowableTracks,
TrackSize::eMaxContentMinSizing,
TrackSize::eMaxContentMaxSizing,
TrackSize::eSkipGrowUnlimited1);
// Now mark min-content/auto/<flex> min-sizing tracks if requested.
auto minOrAutoSelector = aSelector & ~TrackSize::eMaxContentMinSizing;
if (minOrAutoSelector) {
numGrowable = MarkExcludedTracks(aPlan, numGrowable, aGrowableTracks,
minOrAutoSelector,
TrackSize::eIntrinsicMaxSizing,
TrackSize::eSkipGrowUnlimited2);
}
}
nscoord space = aAvailableSpace;
DebugOnly<bool> didClamp = false;
while (numGrowable) {
nscoord spacePerTrack = std::max<nscoord>(space / numGrowable, 1);
for (uint32_t track : aGrowableTracks) {
TrackSize& sz = aPlan[track];
if (sz.mState & TrackSize::eSkipGrowUnlimited) {
continue; // an excluded track
}
nscoord delta = spacePerTrack;
nscoord newBase = sz.mBase + delta;
if (MOZ_UNLIKELY((sz.mState & TrackSize::eFitContent) &&
aFitContentClamper)) {
// Clamp newBase to the fit-content() size, for §12.5.2 step 5/6.
if (aFitContentClamper(track, sz.mBase, &newBase)) {
didClamp = true;
delta = newBase - sz.mBase;
MOZ_ASSERT(delta >= 0, "track size shouldn't shrink");
sz.mState |= TrackSize::eSkipGrowUnlimited1;
--numGrowable;
}
}
sz.mBase = newBase;
space -= delta;
MOZ_ASSERT(space >= 0);
if (space == 0) {
return;
}
}
}
MOZ_ASSERT(didClamp, "we don't exit the loop above except by return, "
"unless we clamped some track's size");
}
/**
* Distribute aAvailableSpace to the planned base size for aGrowableTracks
* up to their limits, then distribute the remaining space beyond the limits.
*/
void DistributeToTrackBases(nscoord aAvailableSpace,
nsTArray<TrackSize>& aPlan,
nsTArray<uint32_t>& aGrowableTracks,
TrackSize::StateBits aSelector)
{
SetupGrowthPlan(aPlan, aGrowableTracks);
nscoord space = GrowTracksToLimit(aAvailableSpace, aPlan, aGrowableTracks, nullptr);
if (space > 0) {
GrowSelectedTracksUnlimited(space, aPlan, aGrowableTracks, aSelector, nullptr);
}
CopyPlanToBase(aPlan, aGrowableTracks);
}
/**
* Distribute aAvailableSpace to the planned limits for aGrowableTracks.
*/
void DistributeToTrackLimits(nscoord aAvailableSpace,
nsTArray<TrackSize>& aPlan,
nsTArray<uint32_t>& aGrowableTracks,
const TrackSizingFunctions& aFunctions,
nscoord aPercentageBasis)
{
auto fitContentClamper = [&aFunctions, aPercentageBasis] (uint32_t aTrack,
nscoord aMinSize,
nscoord* aSize) {
nscoord fitContentLimit =
::ResolveToDefiniteSize(aFunctions.MaxSizingFor(aTrack), aPercentageBasis);
if (*aSize > fitContentLimit) {
*aSize = std::max(aMinSize, fitContentLimit);
return true;
}
return false;
};
nscoord space = GrowTracksToLimit(aAvailableSpace, aPlan, aGrowableTracks,
fitContentClamper);
if (space > 0) {
GrowSelectedTracksUnlimited(aAvailableSpace, aPlan, aGrowableTracks,
TrackSize::StateBits(0), fitContentClamper);
}
CopyPlanToLimit(aPlan, aGrowableTracks);
}
/**
* Distribute aAvailableSize to the tracks. This implements 12.6 at:
* http://dev.w3.org/csswg/css-grid/#algo-grow-tracks
*/
void DistributeFreeSpace(nscoord aAvailableSize)
{
const uint32_t numTracks = mSizes.Length();
if (MOZ_UNLIKELY(numTracks == 0 || aAvailableSize <= 0)) {
return;
}
if (aAvailableSize == NS_UNCONSTRAINEDSIZE) {
for (TrackSize& sz : mSizes) {
sz.mBase = sz.mLimit;
}
} else {
// Compute free space and count growable tracks.
nscoord space = aAvailableSize;
uint32_t numGrowable = numTracks;
for (const TrackSize& sz : mSizes) {
space -= sz.mBase;
MOZ_ASSERT(sz.mBase <= sz.mLimit);
if (sz.mBase == sz.mLimit) {
--numGrowable;
}
}
// Distribute the free space evenly to the growable tracks. If not exactly
// divisable the remainder is added to the leading tracks.
while (space > 0 && numGrowable) {
nscoord spacePerTrack =
std::max<nscoord>(space / numGrowable, 1);
for (uint32_t i = 0; i < numTracks && space > 0; ++i) {
TrackSize& sz = mSizes[i];
if (sz.mBase == sz.mLimit) {
continue;
}
nscoord newBase = sz.mBase + spacePerTrack;
if (newBase >= sz.mLimit) {
space -= sz.mLimit - sz.mBase;
sz.mBase = sz.mLimit;
--numGrowable;
} else {
space -= spacePerTrack;
sz.mBase = newBase;
}
}
}
}
}
/**
* Implements "12.7.1. Find the Size of an 'fr'".
* http://dev.w3.org/csswg/css-grid/#algo-find-fr-size
* (The returned value is a 'nscoord' divided by a factor - a floating type
* is used to avoid intermediary rounding errors.)
*/
float FindFrUnitSize(const LineRange& aRange,
const nsTArray<uint32_t>& aFlexTracks,
const TrackSizingFunctions& aFunctions,
nscoord aSpaceToFill) const;
/**
* Implements the "find the used flex fraction" part of StretchFlexibleTracks.
* (The returned value is a 'nscoord' divided by a factor - a floating type
* is used to avoid intermediary rounding errors.)
*/
float FindUsedFlexFraction(GridReflowInput& aState,
nsTArray<GridItemInfo>& aGridItems,
const nsTArray<uint32_t>& aFlexTracks,
const TrackSizingFunctions& aFunctions,
nscoord aAvailableSize) const;
/**
* Implements "12.7. Stretch Flexible Tracks"
* http://dev.w3.org/csswg/css-grid/#algo-flex-tracks
*/
void StretchFlexibleTracks(GridReflowInput& aState,
nsTArray<GridItemInfo>& aGridItems,
const TrackSizingFunctions& aFunctions,
nscoord aAvailableSize);
/**
* Implements "12.3. Track Sizing Algorithm"
* http://dev.w3.org/csswg/css-grid/#algo-track-sizing
*/
void CalculateSizes(GridReflowInput& aState,
nsTArray<GridItemInfo>& aGridItems,
const TrackSizingFunctions& aFunctions,
nscoord aContentSize,
LineRange GridArea::* aRange,
IntrinsicISizeType aConstraint);
/**
* Apply 'align/justify-content', whichever is relevant for this axis.
* https://drafts.csswg.org/css-align-3/#propdef-align-content
*/
void AlignJustifyContent(const nsStylePosition* aStyle,
WritingMode aWM,
const LogicalSize& aContainerSize);
nscoord GridLineEdge(uint32_t aLine, GridLineSide aSide) const
{
if (MOZ_UNLIKELY(mSizes.IsEmpty())) {
// https://drafts.csswg.org/css-grid/#grid-definition
// "... the explicit grid still contains one grid line in each axis."
MOZ_ASSERT(aLine == 0, "We should only resolve line 1 in an empty grid");
return nscoord(0);
}
MOZ_ASSERT(aLine <= mSizes.Length(), "mSizes is too small");
if (aSide == GridLineSide::eBeforeGridGap) {
if (aLine == 0) {
return nscoord(0);
}
const TrackSize& sz = mSizes[aLine - 1];
return sz.mPosition + sz.mBase;
}
if (aLine == mSizes.Length()) {
return mContentBoxSize;
}
return mSizes[aLine].mPosition;
}
nscoord SumOfGridGaps() const
{
auto len = mSizes.Length();
return MOZ_LIKELY(len > 1) ? (len - 1) * mGridGap : 0;
}
/**
* Break before aRow, i.e. set the eBreakBefore flag on aRow and set the grid
* gap before aRow to zero (and shift all rows after it by the removed gap).
*/
void BreakBeforeRow(uint32_t aRow)
{
MOZ_ASSERT(mAxis == eLogicalAxisBlock,
"Should only be fragmenting in the block axis (between rows)");
nscoord prevRowEndPos = 0;
if (aRow != 0) {
auto& prevSz = mSizes[aRow - 1];
prevRowEndPos = prevSz.mPosition + prevSz.mBase;
}
auto& sz = mSizes[aRow];
const nscoord gap = sz.mPosition - prevRowEndPos;
sz.mState |= TrackSize::eBreakBefore;
if (gap != 0) {
for (uint32_t i = aRow, len = mSizes.Length(); i < len; ++i) {
mSizes[i].mPosition -= gap;
}
}
}
/**
* Set the size of aRow to aSize and adjust the position of all rows after it.
*/
void ResizeRow(uint32_t aRow, nscoord aNewSize)
{
MOZ_ASSERT(mAxis == eLogicalAxisBlock,
"Should only be fragmenting in the block axis (between rows)");
MOZ_ASSERT(aNewSize >= 0);
auto& sz = mSizes[aRow];
nscoord delta = aNewSize - sz.mBase;
NS_WARNING_ASSERTION(delta != nscoord(0), "Useless call to ResizeRow");
sz.mBase = aNewSize;
const uint32_t numRows = mSizes.Length();
for (uint32_t r = aRow + 1; r < numRows; ++r) {
mSizes[r].mPosition += delta;
}
}
nscoord ResolveSize(const LineRange& aRange) const
{
MOZ_ASSERT(mCanResolveLineRangeSize);
MOZ_ASSERT(aRange.Extent() > 0, "grid items cover at least one track");
nscoord pos, size;
aRange.ToPositionAndLength(mSizes, &pos, &size);
return size;
}
nsTArray<nsString> GetLineNamesAtIndex(
const nsStyleGridTemplate& aGridTemplate,
const TrackSizingFunctions& aFunctions,
uint32_t aIndex)
{
nsTArray<nsString> lineNames;
bool hasRepeatAuto = aGridTemplate.HasRepeatAuto();
const nsTArray<nsTArray<nsString>>& lineNameLists(
aGridTemplate.mLineNameLists);
if (!hasRepeatAuto) {
if (aIndex < lineNameLists.Length()) {
lineNames.AppendElements(lineNameLists[aIndex]);
}
} else {
const uint32_t repeatTrackCount = aFunctions.NumRepeatTracks();
const uint32_t repeatAutoStart = aGridTemplate.mRepeatAutoIndex;
const uint32_t repeatAutoEnd = (repeatAutoStart + repeatTrackCount);
const int32_t repeatEndDelta = int32_t(repeatTrackCount - 1);
if (aIndex < repeatAutoEnd && aIndex >= repeatAutoStart) {
lineNames.AppendElements(aGridTemplate.mRepeatAutoLineNameListBefore);
} else if (aIndex <= repeatAutoEnd && aIndex > repeatAutoStart) {
lineNames.AppendElements(aGridTemplate.mRepeatAutoLineNameListAfter);
} else if (aIndex <= repeatAutoStart) {
if (aIndex < lineNameLists.Length()) {
lineNames.AppendElements(lineNameLists[aIndex]);
}
if (aIndex == repeatAutoEnd) {
uint32_t i = aIndex + 1;
if (i < lineNameLists.Length()) {
lineNames.AppendElements(lineNameLists[i]);
}
}
} else if (aIndex >= repeatAutoEnd) {
uint32_t i = aIndex - repeatEndDelta;
if (i < lineNameLists.Length()) {
lineNames.AppendElements(lineNameLists[i]);
}
}
}
return lineNames;
}
#ifdef DEBUG
void Dump() const
{
for (uint32_t i = 0, len = mSizes.Length(); i < len; ++i) {
printf(" %d: ", i);
mSizes[i].Dump();
printf("\n");
}
}
#endif
AutoTArray<TrackSize, 32> mSizes;
nscoord mContentBoxSize;
nscoord mGridGap;
LogicalAxis mAxis;
// Used for aligning a baseline-aligned subtree of items. The only possible
// values are NS_STYLE_ALIGN_{START,END,CENTER,AUTO}. AUTO means there are
// no baseline-aligned items in any track in that axis.
// There is one alignment value for each BaselineSharingGroup.
uint8_t mBaselineSubtreeAlign[2];
// True if track positions and sizes are final in this axis.
bool mCanResolveLineRangeSize;
};
/**
* Grid data shared by all continuations, owned by the first-in-flow.
* The data is initialized from the first-in-flow's GridReflowInput at
* the end of its reflow. Fragmentation will modify mRows.mSizes -
* the mPosition to remove the row gap at the break boundary, the mState
* by setting the eBreakBefore flag, and mBase is modified when we decide
* to grow a row. mOriginalRowData is setup by the first-in-flow and
* not modified after that. It's used for undoing the changes to mRows.
* mCols, mGridItems, mAbsPosItems are used for initializing the grid
* reflow state for continuations, see GridReflowInput::Initialize below.
*/
struct nsGridContainerFrame::SharedGridData
{
SharedGridData() :
mCols(eLogicalAxisInline),
mRows(eLogicalAxisBlock),
mGenerateComputedGridInfo(false) {}
Tracks mCols;
Tracks mRows;
struct RowData {
nscoord mBase; // the original track size
nscoord mGap; // the original gap before a track
};
nsTArray<RowData> mOriginalRowData;
nsTArray<GridItemInfo> mGridItems;
nsTArray<GridItemInfo> mAbsPosItems;
bool mGenerateComputedGridInfo;
/**
* Only set on the first-in-flow. Continuations will Initialize() their
* GridReflowInput from it.
*/
NS_DECLARE_FRAME_PROPERTY_DELETABLE(Prop, SharedGridData)
};
struct MOZ_STACK_CLASS nsGridContainerFrame::GridReflowInput
{
GridReflowInput(nsGridContainerFrame* aFrame,
const ReflowInput& aRI)
: GridReflowInput(aFrame, *aRI.mRenderingContext, &aRI, aRI.mStylePosition,
aRI.GetWritingMode())
{}
GridReflowInput(nsGridContainerFrame* aFrame,
nsRenderingContext& aRC)
: GridReflowInput(aFrame, aRC, nullptr, aFrame->StylePosition(),
aFrame->GetWritingMode())
{}
/**
* Initialize our track sizes and grid item info using the shared
* state from aGridContainerFrame first-in-flow.
*/
void InitializeForContinuation(nsGridContainerFrame* aGridContainerFrame,
nscoord aConsumedBSize)
{
MOZ_ASSERT(aGridContainerFrame->GetPrevInFlow(),
"don't call this on the first-in-flow");
MOZ_ASSERT(mGridItems.IsEmpty() && mAbsPosItems.IsEmpty(),
"shouldn't have any item data yet");
// Get the SharedGridData from the first-in-flow. Also calculate the number
// of fragments before this so that we can figure out our start row below.
uint32_t fragment = 0;
nsIFrame* firstInFlow = aGridContainerFrame;
for (auto pif = aGridContainerFrame->GetPrevInFlow();
pif; pif = pif->GetPrevInFlow()) {
++fragment;
firstInFlow = pif;
}
mSharedGridData = firstInFlow->Properties().Get(SharedGridData::Prop());
MOZ_ASSERT(mSharedGridData, "first-in-flow must have SharedGridData");
// Find the start row for this fragment and undo breaks after that row
// since the breaks might be different from the last reflow.
auto& rowSizes = mSharedGridData->mRows.mSizes;
const uint32_t numRows = rowSizes.Length();
mStartRow = numRows;
for (uint32_t row = 0, breakCount = 0; row < numRows; ++row) {
if (rowSizes[row].mState & TrackSize::eBreakBefore) {
if (fragment == ++breakCount) {
mStartRow = row;
mFragBStart = rowSizes[row].mPosition;
// Restore the original size for |row| and grid gaps / state after it.
const auto& origRowData = mSharedGridData->mOriginalRowData;
rowSizes[row].mBase = origRowData[row].mBase;
nscoord prevEndPos = rowSizes[row].mPosition + rowSizes[row].mBase;
while (++row < numRows) {
auto& sz = rowSizes[row];
const auto& orig = origRowData[row];
sz.mPosition = prevEndPos + orig.mGap;
sz.mBase = orig.mBase;
sz.mState &= ~TrackSize::eBreakBefore;
prevEndPos = sz.mPosition + sz.mBase;
}
break;
}
}
}
if (mStartRow == numRows) {
// All of the grid's rows fit inside of previous grid-container fragments.
mFragBStart = aConsumedBSize;
}
// Copy the shared track state.
// XXX consider temporarily swapping the array elements instead and swapping
// XXX them back after we're done reflowing, for better performance.
// XXX (bug 1252002)
mCols = mSharedGridData->mCols;
mRows = mSharedGridData->mRows;
// Copy item data from each child's first-in-flow data in mSharedGridData.
// XXX NOTE: This is O(n^2) in the number of items. (bug 1252186)
mIter.Reset();
for (; !mIter.AtEnd(); mIter.Next()) {
nsIFrame* child = *mIter;
nsIFrame* childFirstInFlow = child->FirstInFlow();
DebugOnly<size_t> len = mGridItems.Length();
for (auto& itemInfo : mSharedGridData->mGridItems) {
if (itemInfo.mFrame == childFirstInFlow) {
auto item = mGridItems.AppendElement(GridItemInfo(child, itemInfo.mArea));
// Copy the item's baseline data so that the item's last fragment can do
// last-baseline alignment if necessary.
item->mState[0] |= itemInfo.mState[0] & ItemState::eAllBaselineBits;
item->mState[1] |= itemInfo.mState[1] & ItemState::eAllBaselineBits;
item->mBaselineOffset[0] = itemInfo.mBaselineOffset[0];
item->mBaselineOffset[1] = itemInfo.mBaselineOffset[1];
break;
}
}
MOZ_ASSERT(mGridItems.Length() == len + 1, "can't find GridItemInfo");
}
// XXX NOTE: This is O(n^2) in the number of abs.pos. items. (bug 1252186)
nsFrameList absPosChildren(aGridContainerFrame->GetChildList(
aGridContainerFrame->GetAbsoluteListID()));
for (auto f : absPosChildren) {
nsIFrame* childFirstInFlow = f->FirstInFlow();
DebugOnly<size_t> len = mAbsPosItems.Length();
for (auto& itemInfo : mSharedGridData->mAbsPosItems) {
if (itemInfo.mFrame == childFirstInFlow) {
mAbsPosItems.AppendElement(GridItemInfo(f, itemInfo.mArea));
break;
}
}
MOZ_ASSERT(mAbsPosItems.Length() == len + 1, "can't find GridItemInfo");
}
// Copy in the computed grid info state bit
if (mSharedGridData->mGenerateComputedGridInfo) {
aGridContainerFrame->AddStateBits(NS_STATE_GRID_GENERATE_COMPUTED_VALUES);
}
}
/**
* Calculate our track sizes.
*/
void CalculateTrackSizes(const Grid& aGrid,
const LogicalSize& aContentBox,
IntrinsicISizeType aConstraint);
/**
* Return the containing block for a grid item occupying aArea.
*/
LogicalRect ContainingBlockFor(const GridArea& aArea) const;
/**
* Return the containing block for an abs.pos. grid item occupying aArea.
* Any 'auto' lines in the grid area will be aligned with grid container
* containing block on that side.
* @param aGridOrigin the origin of the grid
* @param aGridCB the grid container containing block (its padding area)
*/
LogicalRect ContainingBlockForAbsPos(const GridArea& aArea,
const LogicalPoint& aGridOrigin,
const LogicalRect& aGridCB) const;
GridItemCSSOrderIterator mIter;
const nsStylePosition* const mGridStyle;
Tracks mCols;
Tracks mRows;
TrackSizingFunctions mColFunctions;
TrackSizingFunctions mRowFunctions;
/**
* Info about each (normal flow) grid item.
*/
nsTArray<GridItemInfo> mGridItems;
/**
* Info about each grid-aligned abs.pos. child.
*/
nsTArray<GridItemInfo> mAbsPosItems;
/**
* @note mReflowInput may be null when using the 2nd ctor above. In this case
* we'll construct a dummy parent reflow state if we need it to calculate
* min/max-content contributions when sizing tracks.
*/
const ReflowInput* const mReflowInput;
nsRenderingContext& mRenderingContext;
nsGridContainerFrame* const mFrame;
SharedGridData* mSharedGridData; // [weak] owned by mFrame's first-in-flow.
/** Computed border+padding with mSkipSides applied. */
LogicalMargin mBorderPadding;
/**
* BStart of this fragment in "grid space" (i.e. the concatenation of content
* areas of all fragments). Equal to mRows.mSizes[mStartRow].mPosition,
* or, if this fragment starts after the last row, the GetConsumedBSize().
*/
nscoord mFragBStart;
/** The start row for this fragment. */
uint32_t mStartRow;
/** Our tentative ApplySkipSides bits. */
LogicalSides mSkipSides;
const WritingMode mWM;
private:
GridReflowInput(nsGridContainerFrame* aFrame,
nsRenderingContext& aRenderingContext,
const ReflowInput* aReflowInput,
const nsStylePosition* aGridStyle,
const WritingMode& aWM)
: mIter(aFrame, kPrincipalList)
, mGridStyle(aGridStyle)
, mCols(eLogicalAxisInline)
, mRows(eLogicalAxisBlock)
, mColFunctions(mGridStyle->mGridTemplateColumns,
mGridStyle->mGridAutoColumnsMin,
mGridStyle->mGridAutoColumnsMax)
, mRowFunctions(mGridStyle->mGridTemplateRows,
mGridStyle->mGridAutoRowsMin,
mGridStyle->mGridAutoRowsMax)
, mReflowInput(aReflowInput)
, mRenderingContext(aRenderingContext)
, mFrame(aFrame)
, mSharedGridData(nullptr)
, mBorderPadding(aWM)
, mFragBStart(0)
, mStartRow(0)
, mWM(aWM)
{
MOZ_ASSERT(!aReflowInput || aReflowInput->mFrame == mFrame);
if (aReflowInput) {
mBorderPadding = aReflowInput->ComputedLogicalBorderPadding();
mSkipSides = aFrame->PreReflowBlockLevelLogicalSkipSides();
mBorderPadding.ApplySkipSides(mSkipSides);
}
}
};
using GridReflowInput = nsGridContainerFrame::GridReflowInput;
/**
* The Grid implements grid item placement and the state of the grid -
* the size of the explicit/implicit grid, which cells are occupied etc.
*/
struct MOZ_STACK_CLASS nsGridContainerFrame::Grid
{
/**
* Place all child frames into the grid and expand the (implicit) grid as
* needed. The allocated GridAreas are stored in the GridAreaProperty
* frame property on the child frame.
* @param aComputedMinSize the container's min-size - used to determine
* the number of repeat(auto-fill/fit) tracks.
* @param aComputedSize the container's size - used to determine
* the number of repeat(auto-fill/fit) tracks.
* @param aComputedMaxSize the container's max-size - used to determine
* the number of repeat(auto-fill/fit) tracks.
*/
void PlaceGridItems(GridReflowInput& aState,
const LogicalSize& aComputedMinSize,
const LogicalSize& aComputedSize,
const LogicalSize& aComputedMaxSize);
/**
* As above but for an abs.pos. child. Any 'auto' lines will be represented
* by kAutoLine in the LineRange result.
* @param aGridStart the first line in the final, but untranslated grid
* @param aGridEnd the last line in the final, but untranslated grid
*/
LineRange ResolveAbsPosLineRange(const nsStyleGridLine& aStart,
const nsStyleGridLine& aEnd,
const LineNameMap& aNameMap,
uint32_t GridNamedArea::* aAreaStart,
uint32_t GridNamedArea::* aAreaEnd,
uint32_t aExplicitGridEnd,
int32_t aGridStart,
int32_t aGridEnd,
const nsStylePosition* aStyle);
/**
* Return a GridArea for abs.pos. item with non-auto lines placed at
* a definite line (1-based) with placement errors resolved. One or both
* positions may still be 'auto'.
* @param aChild the abs.pos. grid item to place
* @param aStyle the StylePosition() for the grid container
*/
GridArea PlaceAbsPos(nsIFrame* aChild,
const LineNameMap& aColLineNameMap,
const LineNameMap& aRowLineNameMap,
const nsStylePosition* aStyle);
/**
* Find the first column in row aLockedRow starting at aStartCol where aArea
* could be placed without overlapping other items. The returned column may
* cause aArea to overflow the current implicit grid bounds if placed there.
*/
uint32_t FindAutoCol(uint32_t aStartCol, uint32_t aLockedRow,
const GridArea* aArea) const;
/**
* Place aArea in the first column (in row aArea->mRows.mStart) starting at
* aStartCol without overlapping other items. The resulting aArea may
* overflow the current implicit grid bounds.
* Pre-condition: aArea->mRows.IsDefinite() is true.
* Post-condition: aArea->IsDefinite() is true.
*/
void PlaceAutoCol(uint32_t aStartCol, GridArea* aArea) const;
/**
* Find the first row in column aLockedCol starting at aStartRow where aArea
* could be placed without overlapping other items. The returned row may
* cause aArea to overflow the current implicit grid bounds if placed there.
*/
uint32_t FindAutoRow(uint32_t aLockedCol, uint32_t aStartRow,
const GridArea* aArea) const;
/**
* Place aArea in the first row (in column aArea->mCols.mStart) starting at
* aStartRow without overlapping other items. The resulting aArea may
* overflow the current implicit grid bounds.
* Pre-condition: aArea->mCols.IsDefinite() is true.
* Post-condition: aArea->IsDefinite() is true.
*/
void PlaceAutoRow(uint32_t aStartRow, GridArea* aArea) const;
/**
* Place aArea in the first column starting at aStartCol,aStartRow without
* causing it to overlap other items or overflow mGridColEnd.
* If there's no such column in aStartRow, continue in position 1,aStartRow+1.
* Pre-condition: aArea->mCols.IsAuto() && aArea->mRows.IsAuto() is true.
* Post-condition: aArea->IsDefinite() is true.
*/
void PlaceAutoAutoInRowOrder(uint32_t aStartCol,
uint32_t aStartRow,
GridArea* aArea) const;
/**
* Place aArea in the first row starting at aStartCol,aStartRow without
* causing it to overlap other items or overflow mGridRowEnd.
* If there's no such row in aStartCol, continue in position aStartCol+1,1.
* Pre-condition: aArea->mCols.IsAuto() && aArea->mRows.IsAuto() is true.
* Post-condition: aArea->IsDefinite() is true.
*/
void PlaceAutoAutoInColOrder(uint32_t aStartCol,
uint32_t aStartRow,
GridArea* aArea) const;
/**
* Return aLine if it's inside the aMin..aMax range (inclusive),
* otherwise return kAutoLine.
*/
static int32_t
AutoIfOutside(int32_t aLine, int32_t aMin, int32_t aMax)
{
MOZ_ASSERT(aMin <= aMax);
if (aLine < aMin || aLine > aMax) {
return kAutoLine;
}
return aLine;
}
/**
* Inflate the implicit grid to include aArea.
* @param aArea may be definite or auto
*/
void InflateGridFor(const GridArea& aArea)
{
mGridColEnd = std::max(mGridColEnd, aArea.mCols.HypotheticalEnd());
mGridRowEnd = std::max(mGridRowEnd, aArea.mRows.HypotheticalEnd());
MOZ_ASSERT(mGridColEnd <= kTranslatedMaxLine &&
mGridRowEnd <= kTranslatedMaxLine);
}
enum LineRangeSide {
eLineRangeSideStart, eLineRangeSideEnd
};
/**
* Return a line number for (non-auto) aLine, per:
* http://dev.w3.org/csswg/css-grid/#line-placement
* @param aLine style data for the line (must be non-auto)
* @param aNth a number of lines to find from aFromIndex, negative if the
* search should be in reverse order. In the case aLine has
* a specified line name, it's permitted to pass in zero which
* will be treated as one.
* @param aFromIndex the zero-based index to start counting from
* @param aLineNameList the explicit named lines
* @param aAreaStart a pointer to GridNamedArea::mColumnStart/mRowStart
* @param aAreaEnd a pointer to GridNamedArea::mColumnEnd/mRowEnd
* @param aExplicitGridEnd the last line in the explicit grid
* @param aEdge indicates whether we are resolving a start or end line
* @param aStyle the StylePosition() for the grid container
* @return a definite line (1-based), clamped to the kMinLine..kMaxLine range
*/
int32_t ResolveLine(const nsStyleGridLine& aLine,
int32_t aNth,
uint32_t aFromIndex,
const LineNameMap& aNameMap,
uint32_t GridNamedArea::* aAreaStart,
uint32_t GridNamedArea::* aAreaEnd,
uint32_t aExplicitGridEnd,
LineRangeSide aSide,
const nsStylePosition* aStyle);
/**
* Helper method for ResolveLineRange.
* @see ResolveLineRange
* @return a pair (start,end) of lines
*/
typedef std::pair<int32_t, int32_t> LinePair;
LinePair ResolveLineRangeHelper(const nsStyleGridLine& aStart,
const nsStyleGridLine& aEnd,
const LineNameMap& aNameMap,
uint32_t GridNamedArea::* aAreaStart,
uint32_t GridNamedArea::* aAreaEnd,
uint32_t aExplicitGridEnd,
const nsStylePosition* aStyle);
/**
* Return a LineRange based on the given style data. Non-auto lines
* are resolved to a definite line number (1-based) per:
* http://dev.w3.org/csswg/css-grid/#line-placement
* with placement errors corrected per:
* http://dev.w3.org/csswg/css-grid/#grid-placement-errors
* @param aStyle the StylePosition() for the grid container
* @param aStart style data for the start line
* @param aEnd style data for the end line
* @param aLineNameList the explicit named lines
* @param aAreaStart a pointer to GridNamedArea::mColumnStart/mRowStart
* @param aAreaEnd a pointer to GridNamedArea::mColumnEnd/mRowEnd
* @param aExplicitGridEnd the last line in the explicit grid
* @param aStyle the StylePosition() for the grid container
*/
LineRange ResolveLineRange(const nsStyleGridLine& aStart,
const nsStyleGridLine& aEnd,
const LineNameMap& aNameMap,
uint32_t GridNamedArea::* aAreaStart,
uint32_t GridNamedArea::* aAreaEnd,
uint32_t aExplicitGridEnd,
const nsStylePosition* aStyle);
/**
* Return a GridArea with non-auto lines placed at a definite line (1-based)
* with placement errors resolved. One or both positions may still
* be 'auto'.
* @param aChild the grid item
* @param aStyle the StylePosition() for the grid container
*/
GridArea PlaceDefinite(nsIFrame* aChild,
const LineNameMap& aColLineNameMap,
const LineNameMap& aRowLineNameMap,
const nsStylePosition* aStyle);
bool HasImplicitNamedArea(const nsString& aName) const
{
return mAreas && mAreas->Contains(aName);
}
/**
* A convenience method to lookup a name in 'grid-template-areas'.
* @param aStyle the StylePosition() for the grid container
* @return null if not found
*/
static const css::GridNamedArea*
FindNamedArea(const nsSubstring& aName, const nsStylePosition* aStyle)
{
if (!aStyle->mGridTemplateAreas) {
return nullptr;
}
const nsTArray<css::GridNamedArea>& areas =
aStyle->mGridTemplateAreas->mNamedAreas;
size_t len = areas.Length();
for (size_t i = 0; i < len; ++i) {
const css::GridNamedArea& area = areas[i];
if (area.mName == aName) {
return &area;
}
}
return nullptr;
}
// Return true if aString ends in aSuffix and has at least one character before
// the suffix. Assign aIndex to where the suffix starts.
static bool
IsNameWithSuffix(const nsString& aString, const nsString& aSuffix,
uint32_t* aIndex)
{
if (StringEndsWith(aString, aSuffix)) {
*aIndex = aString.Length() - aSuffix.Length();
return *aIndex != 0;
}
return false;
}
static bool
IsNameWithEndSuffix(const nsString& aString, uint32_t* aIndex)
{
return IsNameWithSuffix(aString, NS_LITERAL_STRING("-end"), aIndex);
}
static bool
IsNameWithStartSuffix(const nsString& aString, uint32_t* aIndex)
{
return IsNameWithSuffix(aString, NS_LITERAL_STRING("-start"), aIndex);
}
/**
* A CellMap holds state for each cell in the grid.
* It's row major. It's sparse in the sense that it only has enough rows to
* cover the last row that has a grid item. Each row only has enough entries
* to cover columns that are occupied *on that row*, i.e. it's not a full
* matrix covering the entire implicit grid. An absent Cell means that it's
* unoccupied by any grid item.
*/
struct CellMap {
struct Cell {
Cell() : mIsOccupied(false) {}
bool mIsOccupied : 1;
};
void Fill(const GridArea& aGridArea)
{
MOZ_ASSERT(aGridArea.IsDefinite());
MOZ_ASSERT(aGridArea.mRows.mStart < aGridArea.mRows.mEnd);
MOZ_ASSERT(aGridArea.mCols.mStart < aGridArea.mCols.mEnd);
const auto numRows = aGridArea.mRows.mEnd;
const auto numCols = aGridArea.mCols.mEnd;
mCells.EnsureLengthAtLeast(numRows);
for (auto i = aGridArea.mRows.mStart; i < numRows; ++i) {
nsTArray<Cell>& cellsInRow = mCells[i];
cellsInRow.EnsureLengthAtLeast(numCols);
for (auto j = aGridArea.mCols.mStart; j < numCols; ++j) {
cellsInRow[j].mIsOccupied = true;
}
}
}
uint32_t IsEmptyCol(uint32_t aCol) const
{
for (auto& row : mCells) {
if (aCol < row.Length() && row[aCol].mIsOccupied) {
return false;
}
}
return true;
}
uint32_t IsEmptyRow(uint32_t aRow) const
{
if (aRow >= mCells.Length()) {
return true;
}
for (const Cell& cell : mCells[aRow]) {
if (cell.mIsOccupied) {
return false;
}
}
return true;
}
#ifdef DEBUG
void Dump() const
{
const size_t numRows = mCells.Length();
for (size_t i = 0; i < numRows; ++i) {
const nsTArray<Cell>& cellsInRow = mCells[i];
const size_t numCols = cellsInRow.Length();
printf("%lu:\t", (unsigned long)i + 1);
for (size_t j = 0; j < numCols; ++j) {
printf(cellsInRow[j].mIsOccupied ? "X " : ". ");
}
printf("\n");
}
}
#endif
nsTArray<nsTArray<Cell>> mCells;
};
/**
* State for each cell in the grid.
*/
CellMap mCellMap;
/**
* @see HasImplicitNamedArea.
*/
ImplicitNamedAreas* mAreas;
/**
* The last column grid line (1-based) in the explicit grid.
* (i.e. the number of explicit columns + 1)
*/
uint32_t mExplicitGridColEnd;
/**
* The last row grid line (1-based) in the explicit grid.
* (i.e. the number of explicit rows + 1)
*/
uint32_t mExplicitGridRowEnd;
// Same for the implicit grid, except these become zero-based after
// resolving definite lines.
uint32_t mGridColEnd;
uint32_t mGridRowEnd;
/**
* Offsets from the start of the implicit grid to the start of the translated
* explicit grid. They are zero if there are no implicit lines before 1,1.
* e.g. "grid-column: span 3 / 1" makes mExplicitGridOffsetCol = 3 and the
* corresponding GridArea::mCols will be 0 / 3 in the zero-based translated
* grid.
*/
uint32_t mExplicitGridOffsetCol;
uint32_t mExplicitGridOffsetRow;
};
void
nsGridContainerFrame::GridReflowInput::CalculateTrackSizes(
const Grid& aGrid,
const LogicalSize& aContentBox,
IntrinsicISizeType aConstraint)
{
mCols.Initialize(mColFunctions, mGridStyle->mGridColumnGap,
aGrid.mGridColEnd, aContentBox.ISize(mWM));
mRows.Initialize(mRowFunctions, mGridStyle->mGridRowGap,
aGrid.mGridRowEnd, aContentBox.BSize(mWM));
mCols.CalculateSizes(*this, mGridItems, mColFunctions,
aContentBox.ISize(mWM), &GridArea::mCols,
aConstraint);
mCols.AlignJustifyContent(mGridStyle, mWM, aContentBox);
// Column positions and sizes are now final.
mCols.mCanResolveLineRangeSize = true;
mRows.CalculateSizes(*this, mGridItems, mRowFunctions,
aContentBox.BSize(mWM), &GridArea::mRows,
aConstraint);
}
/**
* (XXX share this utility function with nsFlexContainerFrame at some point)
*
* Helper for BuildDisplayList, to implement this special-case for grid
* items from the spec:
* The painting order of grid items is exactly the same as inline blocks,
* except that [...] 'z-index' values other than 'auto' create a stacking
* context even if 'position' is 'static'.
* http://dev.w3.org/csswg/css-grid/#z-order
*/
static uint32_t
GetDisplayFlagsForGridItem(nsIFrame* aFrame)
{
const nsStylePosition* pos = aFrame->StylePosition();
if (pos->mZIndex.GetUnit() == eStyleUnit_Integer) {
return nsIFrame::DISPLAY_CHILD_FORCE_STACKING_CONTEXT;
}
return nsIFrame::DISPLAY_CHILD_FORCE_PSEUDO_STACKING_CONTEXT;
}
static nscoord
SpaceToFill(WritingMode aWM, const LogicalSize& aSize, nscoord aMargin,
LogicalAxis aAxis, nscoord aCBSize)
{
nscoord size = aAxis == eLogicalAxisBlock ? aSize.BSize(aWM)
: aSize.ISize(aWM);
return aCBSize - (size + aMargin);
}
// Align an item's margin box in its aAxis inside aCBSize.
static void
AlignJustifySelf(uint8_t aAlignment, bool aOverflowSafe, LogicalAxis aAxis,
bool aSameSide, nscoord aBaselineAdjust, nscoord aCBSize,
const ReflowInput& aRI, const LogicalSize& aChildSize,
LogicalPoint* aPos)
{
MOZ_ASSERT(aAlignment != NS_STYLE_ALIGN_AUTO, "unexpected 'auto' "
"computed value for normal flow grid item");
MOZ_ASSERT(aAlignment != NS_STYLE_ALIGN_LEFT &&
aAlignment != NS_STYLE_ALIGN_RIGHT,
"caller should map that to the corresponding START/END");
// Map some alignment values to 'start' / 'end'.
switch (aAlignment) {
case NS_STYLE_ALIGN_SELF_START: // align/justify-self: self-start
aAlignment = MOZ_LIKELY(aSameSide) ? NS_STYLE_ALIGN_START
: NS_STYLE_ALIGN_END;
break;
case NS_STYLE_ALIGN_SELF_END: // align/justify-self: self-end
aAlignment = MOZ_LIKELY(aSameSide) ? NS_STYLE_ALIGN_END
: NS_STYLE_ALIGN_START;
break;
case NS_STYLE_ALIGN_FLEX_START: // same as 'start' for Grid
aAlignment = NS_STYLE_ALIGN_START;
break;
case NS_STYLE_ALIGN_FLEX_END: // same as 'end' for Grid
aAlignment = NS_STYLE_ALIGN_END;
break;
}
// XXX try to condense this code a bit by adding the necessary convenience
// methods? (bug 1209710)
// Get the item's margin corresponding to the container's start/end side.
const LogicalMargin margin = aRI.ComputedLogicalMargin();
WritingMode wm = aRI.GetWritingMode();
nscoord marginStart, marginEnd;
if (aAxis == eLogicalAxisBlock) {
if (MOZ_LIKELY(aSameSide)) {
marginStart = margin.BStart(wm);
marginEnd = margin.BEnd(wm);
} else {
marginStart = margin.BEnd(wm);
marginEnd = margin.BStart(wm);
}
} else {
if (MOZ_LIKELY(aSameSide)) {
marginStart = margin.IStart(wm);
marginEnd = margin.IEnd(wm);
} else {
marginStart = margin.IEnd(wm);
marginEnd = margin.IStart(wm);
}
}
const auto& styleMargin = aRI.mStyleMargin->mMargin;
bool hasAutoMarginStart;
bool hasAutoMarginEnd;
if (aAxis == eLogicalAxisBlock) {
hasAutoMarginStart = styleMargin.GetBStartUnit(wm) == eStyleUnit_Auto;
hasAutoMarginEnd = styleMargin.GetBEndUnit(wm) == eStyleUnit_Auto;
} else {
hasAutoMarginStart = styleMargin.GetIStartUnit(wm) == eStyleUnit_Auto;
hasAutoMarginEnd = styleMargin.GetIEndUnit(wm) == eStyleUnit_Auto;
}
// https://drafts.csswg.org/css-align-3/#overflow-values
// This implements <overflow-position> = 'safe'.
// And auto-margins: https://drafts.csswg.org/css-grid/#auto-margins
if ((MOZ_UNLIKELY(aOverflowSafe) && aAlignment != NS_STYLE_ALIGN_START) ||
hasAutoMarginStart || hasAutoMarginEnd) {
nscoord space = SpaceToFill(wm, aChildSize, marginStart + marginEnd,
aAxis, aCBSize);
// XXX we might want to include == 0 here as an optimization -
// I need to see what the baseline/last-baseline code looks like first.
if (space < 0) {
// "Overflowing elements ignore their auto margins and overflow
// in the end directions"
aAlignment = NS_STYLE_ALIGN_START;
} else if (hasAutoMarginEnd) {
aAlignment = hasAutoMarginStart ? NS_STYLE_ALIGN_CENTER
: (aSameSide ? NS_STYLE_ALIGN_START
: NS_STYLE_ALIGN_END);
} else if (hasAutoMarginStart) {
aAlignment = aSameSide ? NS_STYLE_ALIGN_END : NS_STYLE_ALIGN_START;
}
}
// Set the position (aPos) for the requested alignment.
nscoord offset = 0; // NOTE: this is the resulting frame offset (border box).
switch (aAlignment) {
case NS_STYLE_ALIGN_BASELINE:
case NS_STYLE_ALIGN_LAST_BASELINE:
if (MOZ_LIKELY(aSameSide == (aAlignment == NS_STYLE_ALIGN_BASELINE))) {
offset = marginStart + aBaselineAdjust;
} else {
nscoord size = aAxis == eLogicalAxisBlock ? aChildSize.BSize(wm)
: aChildSize.ISize(wm);
offset = aCBSize - (size + marginEnd) - aBaselineAdjust;
}
break;
case NS_STYLE_ALIGN_STRETCH:
MOZ_FALLTHROUGH; // ComputeSize() deals with it
case NS_STYLE_ALIGN_START:
offset = marginStart;
break;
case NS_STYLE_ALIGN_END: {
nscoord size = aAxis == eLogicalAxisBlock ? aChildSize.BSize(wm)
: aChildSize.ISize(wm);
offset = aCBSize - (size + marginEnd);
break;
}
case NS_STYLE_ALIGN_CENTER: {
nscoord size = aAxis == eLogicalAxisBlock ? aChildSize.BSize(wm)
: aChildSize.ISize(wm);
offset = (aCBSize - size + marginStart - marginEnd) / 2;
break;
}
default:
MOZ_ASSERT_UNREACHABLE("unknown align-/justify-self value");
}
if (offset != 0) {
nscoord& pos = aAxis == eLogicalAxisBlock ? aPos->B(wm) : aPos->I(wm);
pos += MOZ_LIKELY(aSameSide) ? offset : -offset;
}
}
static bool
SameSide(WritingMode aContainerWM, LogicalSide aContainerSide,
WritingMode aChildWM, LogicalSide aChildSide)
{
MOZ_ASSERT(aContainerWM.PhysicalAxis(GetAxis(aContainerSide)) ==
aChildWM.PhysicalAxis(GetAxis(aChildSide)));
return aContainerWM.PhysicalSide(aContainerSide) ==
aChildWM.PhysicalSide(aChildSide);
}
static void
AlignSelf(const nsGridContainerFrame::GridItemInfo& aGridItem,
uint8_t aAlignSelf, nscoord aCBSize, const WritingMode aCBWM,
const ReflowInput& aRI, const LogicalSize& aSize,
LogicalPoint* aPos)
{
auto alignSelf = aAlignSelf;
bool overflowSafe = alignSelf & NS_STYLE_ALIGN_SAFE;
alignSelf &= ~NS_STYLE_ALIGN_FLAG_BITS;
// Grid's 'align-self' axis is never parallel to the container's inline axis.
if (alignSelf == NS_STYLE_ALIGN_LEFT || alignSelf == NS_STYLE_ALIGN_RIGHT) {
alignSelf = NS_STYLE_ALIGN_START;
}
if (MOZ_LIKELY(alignSelf == NS_STYLE_ALIGN_NORMAL)) {
alignSelf = NS_STYLE_ALIGN_STRETCH;
}
WritingMode childWM = aRI.GetWritingMode();
bool isOrthogonal = aCBWM.IsOrthogonalTo(childWM);
// |sameSide| is true if the container's start side in this axis is the same
// as the child's start side, in the child's parallel axis.
bool sameSide = SameSide(aCBWM, eLogicalSideBStart,
childWM, isOrthogonal ? eLogicalSideIStart
: eLogicalSideBStart);
nscoord baselineAdjust = 0;
if (alignSelf == NS_STYLE_ALIGN_BASELINE ||
alignSelf == NS_STYLE_ALIGN_LAST_BASELINE) {
alignSelf = aGridItem.GetSelfBaseline(alignSelf, eLogicalAxisBlock,
&baselineAdjust);
}
LogicalAxis axis = isOrthogonal ? eLogicalAxisInline : eLogicalAxisBlock;
AlignJustifySelf(alignSelf, overflowSafe, axis, sameSide, baselineAdjust,
aCBSize, aRI, aSize, aPos);
}
static void
JustifySelf(const nsGridContainerFrame::GridItemInfo& aGridItem,
uint8_t aJustifySelf, nscoord aCBSize, const WritingMode aCBWM,
const ReflowInput& aRI, const LogicalSize& aSize,
LogicalPoint* aPos)
{
auto justifySelf = aJustifySelf;
bool overflowSafe = justifySelf & NS_STYLE_JUSTIFY_SAFE;
justifySelf &= ~NS_STYLE_JUSTIFY_FLAG_BITS;
if (MOZ_LIKELY(justifySelf == NS_STYLE_ALIGN_NORMAL)) {
justifySelf = NS_STYLE_ALIGN_STRETCH;
}
WritingMode childWM = aRI.GetWritingMode();
bool isOrthogonal = aCBWM.IsOrthogonalTo(childWM);
// |sameSide| is true if the container's start side in this axis is the same
// as the child's start side, in the child's parallel axis.
bool sameSide = SameSide(aCBWM, eLogicalSideIStart,
childWM, isOrthogonal ? eLogicalSideBStart
: eLogicalSideIStart);
nscoord baselineAdjust = 0;
// Grid's 'justify-self' axis is always parallel to the container's inline
// axis, so justify-self:left|right always applies.
switch (justifySelf) {
case NS_STYLE_JUSTIFY_LEFT:
justifySelf = aCBWM.IsBidiLTR() ? NS_STYLE_JUSTIFY_START
: NS_STYLE_JUSTIFY_END;
break;
case NS_STYLE_JUSTIFY_RIGHT:
justifySelf = aCBWM.IsBidiLTR() ? NS_STYLE_JUSTIFY_END
: NS_STYLE_JUSTIFY_START;
break;
case NS_STYLE_JUSTIFY_BASELINE:
case NS_STYLE_JUSTIFY_LAST_BASELINE:
justifySelf = aGridItem.GetSelfBaseline(justifySelf, eLogicalAxisInline,
&baselineAdjust);
break;
}
LogicalAxis axis = isOrthogonal ? eLogicalAxisBlock : eLogicalAxisInline;
AlignJustifySelf(justifySelf, overflowSafe, axis, sameSide, baselineAdjust,
aCBSize, aRI, aSize, aPos);
}
static uint16_t
GetAlignJustifyValue(uint16_t aAlignment, const WritingMode aWM,
const bool aIsAlign, bool* aOverflowSafe)
{
*aOverflowSafe = aAlignment & NS_STYLE_ALIGN_SAFE;
aAlignment &= (NS_STYLE_ALIGN_ALL_BITS & ~NS_STYLE_ALIGN_FLAG_BITS);
// Map some alignment values to 'start' / 'end'.
switch (aAlignment) {
case NS_STYLE_ALIGN_LEFT:
case NS_STYLE_ALIGN_RIGHT: {
if (aIsAlign) {
// Grid's 'align-content' axis is never parallel to the inline axis.
return NS_STYLE_ALIGN_START;
}
bool isStart = aWM.IsBidiLTR() == (aAlignment == NS_STYLE_ALIGN_LEFT);
return isStart ? NS_STYLE_ALIGN_START : NS_STYLE_ALIGN_END;
}
case NS_STYLE_ALIGN_FLEX_START: // same as 'start' for Grid
return NS_STYLE_ALIGN_START;
case NS_STYLE_ALIGN_FLEX_END: // same as 'end' for Grid
return NS_STYLE_ALIGN_END;
}
return aAlignment;
}
static uint16_t
GetAlignJustifyFallbackIfAny(uint16_t aAlignment, const WritingMode aWM,
const bool aIsAlign, bool* aOverflowSafe)
{
uint16_t fallback = aAlignment >> NS_STYLE_ALIGN_ALL_SHIFT;
if (fallback) {
return GetAlignJustifyValue(fallback, aWM, aIsAlign, aOverflowSafe);
}
// https://drafts.csswg.org/css-align-3/#fallback-alignment
switch (aAlignment) {
case NS_STYLE_ALIGN_STRETCH:
case NS_STYLE_ALIGN_SPACE_BETWEEN:
return NS_STYLE_ALIGN_START;
case NS_STYLE_ALIGN_SPACE_AROUND:
case NS_STYLE_ALIGN_SPACE_EVENLY:
return NS_STYLE_ALIGN_CENTER;
}
return 0;
}
//----------------------------------------------------------------------
// Frame class boilerplate
// =======================
NS_QUERYFRAME_HEAD(nsGridContainerFrame)
NS_QUERYFRAME_ENTRY(nsGridContainerFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
NS_IMPL_FRAMEARENA_HELPERS(nsGridContainerFrame)
nsContainerFrame*
NS_NewGridContainerFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext)
{
return new (aPresShell) nsGridContainerFrame(aContext);
}
//----------------------------------------------------------------------
// nsGridContainerFrame Method Implementations
// ===========================================
/*static*/ const nsRect&
nsGridContainerFrame::GridItemCB(nsIFrame* aChild)
{
MOZ_ASSERT((aChild->GetStateBits() & NS_FRAME_OUT_OF_FLOW) &&
aChild->IsAbsolutelyPositioned());
nsRect* cb = aChild->Properties().Get(GridItemContainingBlockRect());
MOZ_ASSERT(cb, "this method must only be called on grid items, and the grid "
"container should've reflowed this item by now and set up cb");
return *cb;
}
void
nsGridContainerFrame::AddImplicitNamedAreas(
const nsTArray<nsTArray<nsString>>& aLineNameLists)
{
// http://dev.w3.org/csswg/css-grid/#implicit-named-areas
// Note: recording these names for fast lookup later is just an optimization.
const uint32_t len =
std::min(aLineNameLists.Length(), size_t(nsStyleGridLine::kMaxLine));
nsTHashtable<nsStringHashKey> currentStarts;
ImplicitNamedAreas* areas = GetImplicitNamedAreas();
for (uint32_t i = 0; i < len; ++i) {
for (const nsString& name : aLineNameLists[i]) {
uint32_t index;
if (Grid::IsNameWithStartSuffix(name, &index) ||
Grid::IsNameWithEndSuffix(name, &index)) {
nsDependentSubstring area(name, 0, index);
if (!areas) {
areas = new ImplicitNamedAreas;
Properties().Set(ImplicitNamedAreasProperty(), areas);
}
areas->PutEntry(area);
}
}
}
}
void
nsGridContainerFrame::InitImplicitNamedAreas(const nsStylePosition* aStyle)
{
ImplicitNamedAreas* areas = GetImplicitNamedAreas();
if (areas) {
// Clear it, but reuse the hashtable itself for now. We'll remove it
// below if it isn't needed anymore.
areas->Clear();
}
AddImplicitNamedAreas(aStyle->mGridTemplateColumns.mLineNameLists);
AddImplicitNamedAreas(aStyle->mGridTemplateRows.mLineNameLists);
if (areas && areas->Count() == 0) {
Properties().Delete(ImplicitNamedAreasProperty());
}
}
int32_t
nsGridContainerFrame::Grid::ResolveLine(const nsStyleGridLine& aLine,
int32_t aNth,
uint32_t aFromIndex,
const LineNameMap& aNameMap,
uint32_t GridNamedArea::* aAreaStart,
uint32_t GridNamedArea::* aAreaEnd,
uint32_t aExplicitGridEnd,
LineRangeSide aSide,
const nsStylePosition* aStyle)
{
MOZ_ASSERT(!aLine.IsAuto());
int32_t line = 0;
if (aLine.mLineName.IsEmpty()) {
MOZ_ASSERT(aNth != 0, "css-grid 9.2: <integer> must not be zero.");
line = int32_t(aFromIndex) + aNth;
} else {
if (aNth == 0) {
// <integer> was omitted; treat it as 1.
aNth = 1;
}
bool isNameOnly = !aLine.mHasSpan && aLine.mInteger == 0;
if (isNameOnly) {
const GridNamedArea* area = FindNamedArea(aLine.mLineName, aStyle);
if (area || HasImplicitNamedArea(aLine.mLineName)) {
// The given name is a named area - look for explicit lines named
// <name>-start/-end depending on which side we're resolving.
// http://dev.w3.org/csswg/css-grid/#grid-placement-slot
uint32_t implicitLine = 0;
nsAutoString lineName(aLine.mLineName);
if (aSide == eLineRangeSideStart) {
lineName.AppendLiteral("-start");
implicitLine = area ? area->*aAreaStart : 0;
} else {
lineName.AppendLiteral("-end");
implicitLine = area ? area->*aAreaEnd : 0;
}
line = aNameMap.FindNamedLine(lineName, &aNth, aFromIndex,
implicitLine);
}
}
if (line == 0) {
// If mLineName ends in -start/-end, try the prefix as a named area.
uint32_t implicitLine = 0;
uint32_t index;
auto GridNamedArea::* areaEdge = aAreaStart;
bool found = IsNameWithStartSuffix(aLine.mLineName, &index);
if (!found) {
found = IsNameWithEndSuffix(aLine.mLineName, &index);
areaEdge = aAreaEnd;
}
if (found) {
const GridNamedArea* area =
FindNamedArea(nsDependentSubstring(aLine.mLineName, 0, index),
aStyle);
if (area) {
implicitLine = area->*areaEdge;
}
}
line = aNameMap.FindNamedLine(aLine.mLineName, &aNth, aFromIndex,
implicitLine);
}
if (line == 0) {
MOZ_ASSERT(aNth != 0, "we found all N named lines but 'line' is zero!");
int32_t edgeLine;
if (aLine.mHasSpan) {
// http://dev.w3.org/csswg/css-grid/#grid-placement-span-int
// 'span <custom-ident> N'
edgeLine = aSide == eLineRangeSideStart ? 1 : aExplicitGridEnd;
} else {
// http://dev.w3.org/csswg/css-grid/#grid-placement-int
// '<custom-ident> N'
edgeLine = aNth < 0 ? 1 : aExplicitGridEnd;
}
// "If not enough lines with that name exist, all lines in the implicit
// grid are assumed to have that name..."
line = edgeLine + aNth;
}
}
return clamped(line, nsStyleGridLine::kMinLine, nsStyleGridLine::kMaxLine);
}
nsGridContainerFrame::Grid::LinePair
nsGridContainerFrame::Grid::ResolveLineRangeHelper(
const nsStyleGridLine& aStart,
const nsStyleGridLine& aEnd,
const LineNameMap& aNameMap,
uint32_t GridNamedArea::* aAreaStart,
uint32_t GridNamedArea::* aAreaEnd,
uint32_t aExplicitGridEnd,
const nsStylePosition* aStyle)
{
MOZ_ASSERT(int32_t(nsGridContainerFrame::kAutoLine) > nsStyleGridLine::kMaxLine);
if (aStart.mHasSpan) {
if (aEnd.mHasSpan || aEnd.IsAuto()) {
// http://dev.w3.org/csswg/css-grid/#grid-placement-errors
if (aStart.mLineName.IsEmpty()) {
// span <integer> / span *
// span <integer> / auto
return LinePair(kAutoLine, aStart.mInteger);
}
// span <custom-ident> / span *
// span <custom-ident> / auto
return LinePair(kAutoLine, 1); // XXX subgrid explicit size instead of 1?
}
uint32_t from = aEnd.mInteger < 0 ? aExplicitGridEnd + 1: 0;
auto end = ResolveLine(aEnd, aEnd.mInteger, from, aNameMap, aAreaStart,
aAreaEnd, aExplicitGridEnd, eLineRangeSideEnd,
aStyle);
int32_t span = aStart.mInteger == 0 ? 1 : aStart.mInteger;
if (end <= 1) {
// The end is at or before the first explicit line, thus all lines before
// it match <custom-ident> since they're implicit.
int32_t start = std::max(end - span, nsStyleGridLine::kMinLine);
return LinePair(start, end);
}
auto start = ResolveLine(aStart, -span, end, aNameMap, aAreaStart,
aAreaEnd, aExplicitGridEnd, eLineRangeSideStart,
aStyle);
return LinePair(start, end);
}
int32_t start = kAutoLine;
if (aStart.IsAuto()) {
if (aEnd.IsAuto()) {
// auto / auto
return LinePair(start, 1); // XXX subgrid explicit size instead of 1?
}
if (aEnd.mHasSpan) {
if (aEnd.mLineName.IsEmpty()) {
// auto / span <integer>
MOZ_ASSERT(aEnd.mInteger != 0);
return LinePair(start, aEnd.mInteger);
}
// http://dev.w3.org/csswg/css-grid/#grid-placement-errors
// auto / span <custom-ident>
return LinePair(start, 1); // XXX subgrid explicit size instead of 1?
}
} else {
uint32_t from = aStart.mInteger < 0 ? aExplicitGridEnd + 1: 0;
start = ResolveLine(aStart, aStart.mInteger, from, aNameMap,
aAreaStart, aAreaEnd, aExplicitGridEnd,
eLineRangeSideStart, aStyle);
if (aEnd.IsAuto()) {
// A "definite line / auto" should resolve the auto to 'span 1'.
// The error handling in ResolveLineRange will make that happen and also
// clamp the end line correctly if we return "start / start".
return LinePair(start, start);
}
}
uint32_t from;
int32_t nth = aEnd.mInteger == 0 ? 1 : aEnd.mInteger;
if (aEnd.mHasSpan) {
if (MOZ_UNLIKELY(start < 0)) {
if (aEnd.mLineName.IsEmpty()) {
return LinePair(start, start + nth);
}
from = 0;
} else {
if (start >= int32_t(aExplicitGridEnd)) {
// The start is at or after the last explicit line, thus all lines
// after it match <custom-ident> since they're implicit.
return LinePair(start, std::min(start + nth, nsStyleGridLine::kMaxLine));
}
from = start;
}
} else {
from = aEnd.mInteger < 0 ? aExplicitGridEnd + 1: 0;
}
auto end = ResolveLine(aEnd, nth, from, aNameMap, aAreaStart,
aAreaEnd, aExplicitGridEnd, eLineRangeSideEnd, aStyle);
if (start == int32_t(kAutoLine)) {
// auto / definite line
start = std::max(nsStyleGridLine::kMinLine, end - 1);
}
return LinePair(start, end);
}
nsGridContainerFrame::LineRange
nsGridContainerFrame::Grid::ResolveLineRange(
const nsStyleGridLine& aStart,
const nsStyleGridLine& aEnd,
const LineNameMap& aNameMap,
uint32_t GridNamedArea::* aAreaStart,
uint32_t GridNamedArea::* aAreaEnd,
uint32_t aExplicitGridEnd,
const nsStylePosition* aStyle)
{
LinePair r = ResolveLineRangeHelper(aStart, aEnd, aNameMap, aAreaStart,
aAreaEnd, aExplicitGridEnd, aStyle);
MOZ_ASSERT(r.second != int32_t(kAutoLine));
if (r.first == int32_t(kAutoLine)) {
// r.second is a span, clamp it to kMaxLine - 1 so that the returned
// range has a HypotheticalEnd <= kMaxLine.
// http://dev.w3.org/csswg/css-grid/#overlarge-grids
r.second = std::min(r.second, nsStyleGridLine::kMaxLine - 1);
} else {
// http://dev.w3.org/csswg/css-grid/#grid-placement-errors
if (r.first > r.second) {
Swap(r.first, r.second);
} else if (r.first == r.second) {
if (MOZ_UNLIKELY(r.first == nsStyleGridLine::kMaxLine)) {
r.first = nsStyleGridLine::kMaxLine - 1;
}
r.second = r.first + 1; // XXX subgrid explicit size instead of 1?
}
}
return LineRange(r.first, r.second);
}
nsGridContainerFrame::GridArea
nsGridContainerFrame::Grid::PlaceDefinite(nsIFrame* aChild,
const LineNameMap& aColLineNameMap,
const LineNameMap& aRowLineNameMap,
const nsStylePosition* aStyle)
{
const nsStylePosition* itemStyle = aChild->StylePosition();
return GridArea(
ResolveLineRange(itemStyle->mGridColumnStart, itemStyle->mGridColumnEnd,
aColLineNameMap,
&GridNamedArea::mColumnStart, &GridNamedArea::mColumnEnd,
mExplicitGridColEnd, aStyle),
ResolveLineRange(itemStyle->mGridRowStart, itemStyle->mGridRowEnd,
aRowLineNameMap,
&GridNamedArea::mRowStart, &GridNamedArea::mRowEnd,
mExplicitGridRowEnd, aStyle));
}
nsGridContainerFrame::LineRange
nsGridContainerFrame::Grid::ResolveAbsPosLineRange(
const nsStyleGridLine& aStart,
const nsStyleGridLine& aEnd,
const LineNameMap& aNameMap,
uint32_t GridNamedArea::* aAreaStart,
uint32_t GridNamedArea::* aAreaEnd,
uint32_t aExplicitGridEnd,
int32_t aGridStart,
int32_t aGridEnd,
const nsStylePosition* aStyle)
{
if (aStart.IsAuto()) {
if (aEnd.IsAuto()) {
return LineRange(kAutoLine, kAutoLine);
}
uint32_t from = aEnd.mInteger < 0 ? aExplicitGridEnd + 1: 0;
int32_t end =
ResolveLine(aEnd, aEnd.mInteger, from, aNameMap, aAreaStart,
aAreaEnd, aExplicitGridEnd, eLineRangeSideEnd, aStyle);
if (aEnd.mHasSpan) {
++end;
}
// A line outside the existing grid is treated as 'auto' for abs.pos (10.1).
end = AutoIfOutside(end, aGridStart, aGridEnd);
return LineRange(kAutoLine, end);
}
if (aEnd.IsAuto()) {
uint32_t from = aStart.mInteger < 0 ? aExplicitGridEnd + 1: 0;
int32_t start =
ResolveLine(aStart, aStart.mInteger, from, aNameMap, aAreaStart,
aAreaEnd, aExplicitGridEnd, eLineRangeSideStart, aStyle);
if (aStart.mHasSpan) {
start = std::max(aGridEnd - start, aGridStart);
}
start = AutoIfOutside(start, aGridStart, aGridEnd);
return LineRange(start, kAutoLine);
}
LineRange r = ResolveLineRange(aStart, aEnd, aNameMap, aAreaStart,
aAreaEnd, aExplicitGridEnd, aStyle);
if (r.IsAuto()) {
MOZ_ASSERT(aStart.mHasSpan && aEnd.mHasSpan, "span / span is the only case "
"leading to IsAuto here -- we dealt with the other cases above");
// The second span was ignored per 9.2.1. For abs.pos., 10.1 says that this
// case should result in "auto / auto" unlike normal flow grid items.
return LineRange(kAutoLine, kAutoLine);
}
return LineRange(AutoIfOutside(r.mUntranslatedStart, aGridStart, aGridEnd),
AutoIfOutside(r.mUntranslatedEnd, aGridStart, aGridEnd));
}
nsGridContainerFrame::GridArea
nsGridContainerFrame::Grid::PlaceAbsPos(nsIFrame* aChild,
const LineNameMap& aColLineNameMap,
const LineNameMap& aRowLineNameMap,
const nsStylePosition* aStyle)
{
const nsStylePosition* itemStyle = aChild->StylePosition();
int32_t gridColStart = 1 - mExplicitGridOffsetCol;
int32_t gridRowStart = 1 - mExplicitGridOffsetRow;
return GridArea(
ResolveAbsPosLineRange(itemStyle->mGridColumnStart,
itemStyle->mGridColumnEnd,
aColLineNameMap,
&GridNamedArea::mColumnStart,
&GridNamedArea::mColumnEnd,
mExplicitGridColEnd, gridColStart, mGridColEnd,
aStyle),
ResolveAbsPosLineRange(itemStyle->mGridRowStart,
itemStyle->mGridRowEnd,
aRowLineNameMap,
&GridNamedArea::mRowStart,
&GridNamedArea::mRowEnd,
mExplicitGridRowEnd, gridRowStart, mGridRowEnd,
aStyle));
}
uint32_t
nsGridContainerFrame::Grid::FindAutoCol(uint32_t aStartCol, uint32_t aLockedRow,
const GridArea* aArea) const
{
const uint32_t extent = aArea->mCols.Extent();
const uint32_t iStart = aLockedRow;
const uint32_t iEnd = iStart + aArea->mRows.Extent();
uint32_t candidate = aStartCol;
for (uint32_t i = iStart; i < iEnd; ) {
if (i >= mCellMap.mCells.Length()) {
break;
}
const nsTArray<CellMap::Cell>& cellsInRow = mCellMap.mCells[i];
const uint32_t len = cellsInRow.Length();
const uint32_t lastCandidate = candidate;
// Find the first gap in the current row that's at least 'extent' wide.
// ('gap' tracks how wide the current column gap is.)
for (uint32_t j = candidate, gap = 0; j < len && gap < extent; ++j) {
if (!cellsInRow[j].mIsOccupied) {
++gap;
continue;
}
candidate = j + 1;
gap = 0;
}
if (lastCandidate < candidate && i != iStart) {
// Couldn't fit 'extent' tracks at 'lastCandidate' here so we must
// restart from the beginning with the new 'candidate'.
i = iStart;
} else {
++i;
}
}
return candidate;
}
void
nsGridContainerFrame::Grid::PlaceAutoCol(uint32_t aStartCol,
GridArea* aArea) const
{
MOZ_ASSERT(aArea->mRows.IsDefinite() && aArea->mCols.IsAuto());
uint32_t col = FindAutoCol(aStartCol, aArea->mRows.mStart, aArea);
aArea->mCols.ResolveAutoPosition(col, mExplicitGridOffsetCol);
MOZ_ASSERT(aArea->IsDefinite());
}
uint32_t
nsGridContainerFrame::Grid::FindAutoRow(uint32_t aLockedCol, uint32_t aStartRow,
const GridArea* aArea) const
{
const uint32_t extent = aArea->mRows.Extent();
const uint32_t jStart = aLockedCol;
const uint32_t jEnd = jStart + aArea->mCols.Extent();
const uint32_t iEnd = mCellMap.mCells.Length();
uint32_t candidate = aStartRow;
// Find the first gap in the rows that's at least 'extent' tall.
// ('gap' tracks how tall the current row gap is.)
for (uint32_t i = candidate, gap = 0; i < iEnd && gap < extent; ++i) {
++gap; // tentative, but we may reset it below if a column is occupied
const nsTArray<CellMap::Cell>& cellsInRow = mCellMap.mCells[i];
const uint32_t clampedJEnd = std::min<uint32_t>(jEnd, cellsInRow.Length());
// Check if the current row is unoccupied from jStart to jEnd.
for (uint32_t j = jStart; j < clampedJEnd; ++j) {
if (cellsInRow[j].mIsOccupied) {
// Couldn't fit 'extent' rows at 'candidate' here; we hit something
// at row 'i'. So, try the row after 'i' as our next candidate.
candidate = i + 1;
gap = 0;
break;
}
}
}
return candidate;
}
void
nsGridContainerFrame::Grid::PlaceAutoRow(uint32_t aStartRow,
GridArea* aArea) const
{
MOZ_ASSERT(aArea->mCols.IsDefinite() && aArea->mRows.IsAuto());
uint32_t row = FindAutoRow(aArea->mCols.mStart, aStartRow, aArea);
aArea->mRows.ResolveAutoPosition(row, mExplicitGridOffsetRow);
MOZ_ASSERT(aArea->IsDefinite());
}
void
nsGridContainerFrame::Grid::PlaceAutoAutoInRowOrder(uint32_t aStartCol,
uint32_t aStartRow,
GridArea* aArea) const
{
MOZ_ASSERT(aArea->mCols.IsAuto() && aArea->mRows.IsAuto());
const uint32_t colExtent = aArea->mCols.Extent();
const uint32_t gridRowEnd = mGridRowEnd;
const uint32_t gridColEnd = mGridColEnd;
uint32_t col = aStartCol;
uint32_t row = aStartRow;
for (; row < gridRowEnd; ++row) {
col = FindAutoCol(col, row, aArea);
if (col + colExtent <= gridColEnd) {
break;
}
col = 0;
}
MOZ_ASSERT(row < gridRowEnd || col == 0,
"expected column 0 for placing in a new row");
aArea->mCols.ResolveAutoPosition(col, mExplicitGridOffsetCol);
aArea->mRows.ResolveAutoPosition(row, mExplicitGridOffsetRow);
MOZ_ASSERT(aArea->IsDefinite());
}
void
nsGridContainerFrame::Grid::PlaceAutoAutoInColOrder(uint32_t aStartCol,
uint32_t aStartRow,
GridArea* aArea) const
{
MOZ_ASSERT(aArea->mCols.IsAuto() && aArea->mRows.IsAuto());
const uint32_t rowExtent = aArea->mRows.Extent();
const uint32_t gridRowEnd = mGridRowEnd;
const uint32_t gridColEnd = mGridColEnd;
uint32_t col = aStartCol;
uint32_t row = aStartRow;
for (; col < gridColEnd; ++col) {
row = FindAutoRow(col, row, aArea);
if (row + rowExtent <= gridRowEnd) {
break;
}
row = 0;
}
MOZ_ASSERT(col < gridColEnd || row == 0,
"expected row 0 for placing in a new column");
aArea->mCols.ResolveAutoPosition(col, mExplicitGridOffsetCol);
aArea->mRows.ResolveAutoPosition(row, mExplicitGridOffsetRow);
MOZ_ASSERT(aArea->IsDefinite());
}
void
nsGridContainerFrame::Grid::PlaceGridItems(GridReflowInput& aState,
const LogicalSize& aComputedMinSize,
const LogicalSize& aComputedSize,
const LogicalSize& aComputedMaxSize)
{
mAreas = aState.mFrame->GetImplicitNamedAreas();
const nsStylePosition* const gridStyle = aState.mGridStyle;
MOZ_ASSERT(mCellMap.mCells.IsEmpty(), "unexpected entries in cell map");
// http://dev.w3.org/csswg/css-grid/#grid-definition
// Initialize the end lines of the Explicit Grid (mExplicitGridCol[Row]End).
// This is determined by the larger of the number of rows/columns defined
// by 'grid-template-areas' and the 'grid-template-rows'/'-columns', plus one.
// Also initialize the Implicit Grid (mGridCol[Row]End) to the same values.
// Note that this is for a grid with a 1,1 origin. We'll change that
// to a 0,0 based grid after placing definite lines.
auto areas = gridStyle->mGridTemplateAreas.get();
uint32_t numRepeatCols = aState.mColFunctions.InitRepeatTracks(
gridStyle->mGridColumnGap,
aComputedMinSize.ISize(aState.mWM),
aComputedSize.ISize(aState.mWM),
aComputedMaxSize.ISize(aState.mWM));
mGridColEnd = mExplicitGridColEnd =
aState.mColFunctions.ComputeExplicitGridEnd(areas ? areas->mNColumns + 1 : 1);
LineNameMap colLineNameMap(gridStyle->mGridTemplateColumns, numRepeatCols);
uint32_t numRepeatRows = aState.mRowFunctions.InitRepeatTracks(
gridStyle->mGridRowGap,
aComputedMinSize.BSize(aState.mWM),
aComputedSize.BSize(aState.mWM),
aComputedMaxSize.BSize(aState.mWM));
mGridRowEnd = mExplicitGridRowEnd =
aState.mRowFunctions.ComputeExplicitGridEnd(areas ? areas->NRows() + 1 : 1);
LineNameMap rowLineNameMap(gridStyle->mGridTemplateRows, numRepeatRows);
// http://dev.w3.org/csswg/css-grid/#line-placement
// Resolve definite positions per spec chap 9.2.
int32_t minCol = 1;
int32_t minRow = 1;
aState.mGridItems.ClearAndRetainStorage();
aState.mIter.Reset();
for (; !aState.mIter.AtEnd(); aState.mIter.Next()) {
nsIFrame* child = *aState.mIter;
GridItemInfo* info =
aState.mGridItems.AppendElement(GridItemInfo(child,
PlaceDefinite(child,
colLineNameMap,
rowLineNameMap,
gridStyle)));
MOZ_ASSERT(aState.mIter.GridItemIndex() == aState.mGridItems.Length() - 1,
"GridItemIndex() is broken");
GridArea& area = info->mArea;
if (area.mCols.IsDefinite()) {
minCol = std::min(minCol, area.mCols.mUntranslatedStart);
}
if (area.mRows.IsDefinite()) {
minRow = std::min(minRow, area.mRows.mUntranslatedStart);
}
}
// Translate the whole grid so that the top-/left-most area is at 0,0.
mExplicitGridOffsetCol = 1 - minCol; // minCol/Row is always <= 1, see above
mExplicitGridOffsetRow = 1 - minRow;
aState.mColFunctions.mExplicitGridOffset = mExplicitGridOffsetCol;
aState.mRowFunctions.mExplicitGridOffset = mExplicitGridOffsetRow;
const int32_t offsetToColZero = int32_t(mExplicitGridOffsetCol) - 1;
const int32_t offsetToRowZero = int32_t(mExplicitGridOffsetRow) - 1;
mGridColEnd += offsetToColZero;
mGridRowEnd += offsetToRowZero;
aState.mIter.Reset();
for (; !aState.mIter.AtEnd(); aState.mIter.Next()) {
GridArea& area = aState.mGridItems[aState.mIter.GridItemIndex()].mArea;
if (area.mCols.IsDefinite()) {
area.mCols.mStart = area.mCols.mUntranslatedStart + offsetToColZero;
area.mCols.mEnd = area.mCols.mUntranslatedEnd + offsetToColZero;
}
if (area.mRows.IsDefinite()) {
area.mRows.mStart = area.mRows.mUntranslatedStart + offsetToRowZero;
area.mRows.mEnd = area.mRows.mUntranslatedEnd + offsetToRowZero;
}
if (area.IsDefinite()) {
mCellMap.Fill(area);
InflateGridFor(area);
}
}
// http://dev.w3.org/csswg/css-grid/#auto-placement-algo
// Step 1, place 'auto' items that have one definite position -
// definite row (column) for grid-auto-flow:row (column).
auto flowStyle = gridStyle->mGridAutoFlow;
const bool isRowOrder = (flowStyle & NS_STYLE_GRID_AUTO_FLOW_ROW);
const bool isSparse = !(flowStyle & NS_STYLE_GRID_AUTO_FLOW_DENSE);
// We need 1 cursor per row (or column) if placement is sparse.
{
Maybe<nsDataHashtable<nsUint32HashKey, uint32_t>> cursors;
if (isSparse) {
cursors.emplace();
}
auto placeAutoMinorFunc = isRowOrder ? &Grid::PlaceAutoCol
: &Grid::PlaceAutoRow;
aState.mIter.Reset();
for (; !aState.mIter.AtEnd(); aState.mIter.Next()) {
GridArea& area = aState.mGridItems[aState.mIter.GridItemIndex()].mArea;
LineRange& major = isRowOrder ? area.mRows : area.mCols;
LineRange& minor = isRowOrder ? area.mCols : area.mRows;
if (major.IsDefinite() && minor.IsAuto()) {
// Items with 'auto' in the minor dimension only.
uint32_t cursor = 0;
if (isSparse) {
cursors->Get(major.mStart, &cursor);
}
(this->*placeAutoMinorFunc)(cursor, &area);
mCellMap.Fill(area);
if (isSparse) {
cursors->Put(major.mStart, minor.mEnd);
}
}
InflateGridFor(area); // Step 2, inflating for auto items too
}
}
// XXX NOTE possible spec issue.
// XXX It's unclear if the remaining major-dimension auto and
// XXX auto in both dimensions should use the same cursor or not,
// XXX https://www.w3.org/Bugs/Public/show_bug.cgi?id=16044
// XXX seems to indicate it shouldn't.
// XXX http://dev.w3.org/csswg/css-grid/#auto-placement-cursor
// XXX now says it should (but didn't in earlier versions)
// Step 3, place the remaining grid items
uint32_t cursorMajor = 0; // for 'dense' these two cursors will stay at 0,0
uint32_t cursorMinor = 0;
auto placeAutoMajorFunc = isRowOrder ? &Grid::PlaceAutoRow
: &Grid::PlaceAutoCol;
aState.mIter.Reset();
for (; !aState.mIter.AtEnd(); aState.mIter.Next()) {
GridArea& area = aState.mGridItems[aState.mIter.GridItemIndex()].mArea;
MOZ_ASSERT(*aState.mIter == aState.mGridItems[aState.mIter.GridItemIndex()].mFrame,
"iterator out of sync with aState.mGridItems");
LineRange& major = isRowOrder ? area.mRows : area.mCols;
LineRange& minor = isRowOrder ? area.mCols : area.mRows;
if (major.IsAuto()) {
if (minor.IsDefinite()) {
// Items with 'auto' in the major dimension only.
if (isSparse) {
if (minor.mStart < cursorMinor) {
++cursorMajor;
}
cursorMinor = minor.mStart;
}
(this->*placeAutoMajorFunc)(cursorMajor, &area);
if (isSparse) {
cursorMajor = major.mStart;
}
} else {
// Items with 'auto' in both dimensions.
if (isRowOrder) {
PlaceAutoAutoInRowOrder(cursorMinor, cursorMajor, &area);
} else {
PlaceAutoAutoInColOrder(cursorMajor, cursorMinor, &area);
}
if (isSparse) {
cursorMajor = major.mStart;
cursorMinor = minor.mEnd;
#ifdef DEBUG
uint32_t gridMajorEnd = isRowOrder ? mGridRowEnd : mGridColEnd;
uint32_t gridMinorEnd = isRowOrder ? mGridColEnd : mGridRowEnd;
MOZ_ASSERT(cursorMajor <= gridMajorEnd,
"we shouldn't need to place items further than 1 track "
"past the current end of the grid, in major dimension");
MOZ_ASSERT(cursorMinor <= gridMinorEnd,
"we shouldn't add implicit minor tracks for auto/auto");
#endif
}
}
mCellMap.Fill(area);
InflateGridFor(area);
}
}
if (aState.mFrame->IsAbsoluteContainer()) {
// 9.4 Absolutely-positioned Grid Items
// http://dev.w3.org/csswg/css-grid/#abspos-items
// We only resolve definite lines here; we'll align auto positions to the
// grid container later during reflow.
nsFrameList children(aState.mFrame->GetChildList(
aState.mFrame->GetAbsoluteListID()));
const int32_t offsetToColZero = int32_t(mExplicitGridOffsetCol) - 1;
const int32_t offsetToRowZero = int32_t(mExplicitGridOffsetRow) - 1;
// Untranslate the grid again temporarily while resolving abs.pos. lines.
AutoRestore<uint32_t> save1(mGridColEnd);
AutoRestore<uint32_t> save2(mGridRowEnd);
mGridColEnd -= offsetToColZero;
mGridRowEnd -= offsetToRowZero;
aState.mAbsPosItems.ClearAndRetainStorage();
size_t i = 0;
for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next(), ++i) {
nsIFrame* child = e.get();
GridItemInfo* info =
aState.mAbsPosItems.AppendElement(GridItemInfo(child,
PlaceAbsPos(child,
colLineNameMap,
rowLineNameMap,
gridStyle)));
GridArea& area = info->mArea;
if (area.mCols.mUntranslatedStart != int32_t(kAutoLine)) {
area.mCols.mStart = area.mCols.mUntranslatedStart + offsetToColZero;
}
if (area.mCols.mUntranslatedEnd != int32_t(kAutoLine)) {
area.mCols.mEnd = area.mCols.mUntranslatedEnd + offsetToColZero;
}
if (area.mRows.mUntranslatedStart != int32_t(kAutoLine)) {
area.mRows.mStart = area.mRows.mUntranslatedStart + offsetToRowZero;
}
if (area.mRows.mUntranslatedEnd != int32_t(kAutoLine)) {
area.mRows.mEnd = area.mRows.mUntranslatedEnd + offsetToRowZero;
}
}
}
// Count empty 'auto-fit' tracks in the repeat() range.
// |colAdjust| will have a count for each line in the grid of how many
// tracks were empty between the start of the grid and that line.
Maybe<nsTArray<uint32_t>> colAdjust;
uint32_t numEmptyCols = 0;
if (aState.mColFunctions.mHasRepeatAuto &&
!gridStyle->mGridTemplateColumns.mIsAutoFill &&
aState.mColFunctions.NumRepeatTracks() > 0) {
for (uint32_t col = aState.mColFunctions.mRepeatAutoStart,
endRepeat = aState.mColFunctions.mRepeatAutoEnd,
numColLines = mGridColEnd + 1;
col < numColLines; ++col) {
if (numEmptyCols) {
(*colAdjust)[col] = numEmptyCols;
}
if (col < endRepeat && mCellMap.IsEmptyCol(col)) {
++numEmptyCols;
if (colAdjust.isNothing()) {
colAdjust.emplace(numColLines);
colAdjust->SetLength(numColLines);
PodZero(colAdjust->Elements(), colAdjust->Length());
}
}
}
}
Maybe<nsTArray<uint32_t>> rowAdjust;
uint32_t numEmptyRows = 0;
if (aState.mRowFunctions.mHasRepeatAuto &&
!gridStyle->mGridTemplateRows.mIsAutoFill &&
aState.mRowFunctions.NumRepeatTracks() > 0) {
for (uint32_t row = aState.mRowFunctions.mRepeatAutoStart,
endRepeat = aState.mRowFunctions.mRepeatAutoEnd,
numRowLines = mGridRowEnd + 1;
row < numRowLines; ++row) {
if (numEmptyRows) {
(*rowAdjust)[row] = numEmptyRows;
}
if (row < endRepeat && mCellMap.IsEmptyRow(row)) {
++numEmptyRows;
if (rowAdjust.isNothing()) {
rowAdjust.emplace(numRowLines);
rowAdjust->SetLength(numRowLines);
PodZero(rowAdjust->Elements(), rowAdjust->Length());
}
}
}
}
// Remove the empty 'auto-fit' tracks we found above, if any.
if (numEmptyCols || numEmptyRows) {
// Adjust the line numbers in the grid areas.
for (auto& item : aState.mGridItems) {
GridArea& area = item.mArea;
if (numEmptyCols) {
area.mCols.AdjustForRemovedTracks(*colAdjust);
}
if (numEmptyRows) {
area.mRows.AdjustForRemovedTracks(*rowAdjust);
}
}
for (auto& item : aState.mAbsPosItems) {
GridArea& area = item.mArea;
if (numEmptyCols) {
area.mCols.AdjustAbsPosForRemovedTracks(*colAdjust);
}
if (numEmptyRows) {
area.mRows.AdjustAbsPosForRemovedTracks(*rowAdjust);
}
}
// Adjust the grid size.
mGridColEnd -= numEmptyCols;
mExplicitGridColEnd -= numEmptyCols;
mGridRowEnd -= numEmptyRows;
mExplicitGridRowEnd -= numEmptyRows;
// Adjust the track mapping to unmap the removed tracks.
auto finalColRepeatCount = aState.mColFunctions.NumRepeatTracks() - numEmptyCols;
aState.mColFunctions.SetNumRepeatTracks(finalColRepeatCount);
auto finalRowRepeatCount = aState.mRowFunctions.NumRepeatTracks() - numEmptyRows;
aState.mRowFunctions.SetNumRepeatTracks(finalRowRepeatCount);
}
}
void
nsGridContainerFrame::Tracks::Initialize(
const TrackSizingFunctions& aFunctions,
const nsStyleCoord& aGridGap,
uint32_t aNumTracks,
nscoord aContentBoxSize)
{
MOZ_ASSERT(aNumTracks >= aFunctions.mExplicitGridOffset +
aFunctions.NumExplicitTracks());
mSizes.SetLength(aNumTracks);
PodZero(mSizes.Elements(), mSizes.Length());
for (uint32_t i = 0, len = mSizes.Length(); i < len; ++i) {
mSizes[i].Initialize(aContentBoxSize,
aFunctions.MinSizingFor(i),
aFunctions.MaxSizingFor(i));
}
mGridGap = ::ResolveToDefiniteSize(aGridGap, aContentBoxSize);
mContentBoxSize = aContentBoxSize;
}
/**
* Reflow aChild in the given aAvailableSize.
*/
static nscoord
MeasuringReflow(nsIFrame* aChild,
const ReflowInput* aReflowInput,
nsRenderingContext* aRC,
const LogicalSize& aAvailableSize)
{
nsContainerFrame* parent = aChild->GetParent();
nsPresContext* pc = aChild->PresContext();
Maybe<ReflowInput> dummyParentState;
const ReflowInput* rs = aReflowInput;
if (!aReflowInput) {
MOZ_ASSERT(!parent->HasAnyStateBits(NS_FRAME_IN_REFLOW));
dummyParentState.emplace(pc, parent, aRC,
LogicalSize(parent->GetWritingMode(), 0,
NS_UNCONSTRAINEDSIZE),
ReflowInput::DUMMY_PARENT_REFLOW_STATE);
rs = dummyParentState.ptr();
}
#ifdef DEBUG
// This will suppress various CRAZY_SIZE warnings for this reflow.
parent->Properties().Set(
nsContainerFrame::DebugReflowingWithInfiniteISize(), true);
#endif
ReflowInput childRI(pc, *rs, aChild, aAvailableSize, nullptr,
ReflowInput::COMPUTE_SIZE_SHRINK_WRAP |
ReflowInput::COMPUTE_SIZE_USE_AUTO_BSIZE);
ReflowOutput childSize(childRI);
nsReflowStatus childStatus;
const uint32_t flags = NS_FRAME_NO_MOVE_FRAME | NS_FRAME_NO_SIZE_VIEW;
WritingMode wm = childRI.GetWritingMode();
parent->ReflowChild(aChild, pc, childSize, childRI, wm,
LogicalPoint(wm), nsSize(), flags, childStatus);
parent->FinishReflowChild(aChild, pc, childSize, &childRI, wm,
LogicalPoint(wm), nsSize(), flags);
#ifdef DEBUG
parent->Properties().Delete(nsContainerFrame::DebugReflowingWithInfiniteISize());
#endif
return childSize.BSize(wm);
}
/**
* Return the [min|max]-content contribution of aChild to its parent (i.e.
* the child's margin-box) in aAxis.
*/
static nscoord
ContentContribution(const GridItemInfo& aGridItem,
const GridReflowInput& aState,
nsRenderingContext* aRC,
WritingMode aCBWM,
LogicalAxis aAxis,
nsLayoutUtils::IntrinsicISizeType aConstraint,
uint32_t aFlags = 0)
{
nsIFrame* child = aGridItem.mFrame;
PhysicalAxis axis(aCBWM.PhysicalAxis(aAxis));
nscoord size = nsLayoutUtils::IntrinsicForAxis(axis, aRC, child, aConstraint,
aFlags | nsLayoutUtils::BAIL_IF_REFLOW_NEEDED);
if (size == NS_INTRINSIC_WIDTH_UNKNOWN) {
// We need to reflow the child to find its BSize contribution.
// XXX this will give mostly correct results for now (until bug 1174569).
nscoord cbISize = INFINITE_ISIZE_COORD;
nscoord cbBSize = NS_UNCONSTRAINEDSIZE;
auto childWM = child->GetWritingMode();
if (aState.mCols.mCanResolveLineRangeSize) {
nscoord sz = aState.mCols.ResolveSize(aGridItem.mArea.mCols);
if (childWM.IsOrthogonalTo(aCBWM)) {
cbBSize = sz;
} else {
cbISize = sz;
}
}
LogicalSize availableSize(childWM, cbISize, cbBSize);
size = ::MeasuringReflow(child, aState.mReflowInput, aRC, availableSize);
nsIFrame::IntrinsicISizeOffsetData offsets = child->IntrinsicBSizeOffsets();
size += offsets.hMargin;
size = nsLayoutUtils::AddPercents(aConstraint, size, offsets.hPctMargin);
}
MOZ_ASSERT(aGridItem.mBaselineOffset[aAxis] >= 0,
"baseline offset should be non-negative at this point");
MOZ_ASSERT((aGridItem.mState[aAxis] & ItemState::eIsBaselineAligned) ||
aGridItem.mBaselineOffset[aAxis] == nscoord(0),
"baseline offset should be zero when not baseline-aligned");
size += aGridItem.mBaselineOffset[aAxis];
return std::max(size, 0);
}
static nscoord
MinContentContribution(const GridItemInfo& aGridItem,
const GridReflowInput& aState,
nsRenderingContext* aRC,
WritingMode aCBWM,
LogicalAxis aAxis)
{
return ContentContribution(aGridItem, aState, aRC, aCBWM, aAxis,
nsLayoutUtils::MIN_ISIZE);
}
static nscoord
MaxContentContribution(const GridItemInfo& aGridItem,
const GridReflowInput& aState,
nsRenderingContext* aRC,
WritingMode aCBWM,
LogicalAxis aAxis)
{
return ContentContribution(aGridItem, aState, aRC, aCBWM, aAxis,
nsLayoutUtils::PREF_ISIZE);
}
static nscoord
MinSize(const GridItemInfo& aGridItem,
const GridReflowInput& aState,
nsRenderingContext* aRC,
WritingMode aCBWM,
LogicalAxis aAxis)
{
nsIFrame* child = aGridItem.mFrame;
PhysicalAxis axis(aCBWM.PhysicalAxis(aAxis));
const nsStylePosition* stylePos = child->StylePosition();
const nsStyleCoord& style = axis == eAxisHorizontal ? stylePos->mMinWidth
: stylePos->mMinHeight;
// https://drafts.csswg.org/css-grid/#min-size-auto
// This calculates the min-content contribution from either a definite
// min-width (or min-height depending on aAxis), or the "specified /
// transferred size" for min-width:auto if overflow == visible (as min-width:0
// otherwise), or NS_UNCONSTRAINEDSIZE for other min-width intrinsic values
// (which results in always taking the "content size" part below).
MOZ_ASSERT(aGridItem.mBaselineOffset[aAxis] >= 0,
"baseline offset should be non-negative at this point");
MOZ_ASSERT((aGridItem.mState[aAxis] & ItemState::eIsBaselineAligned) ||
aGridItem.mBaselineOffset[aAxis] == nscoord(0),
"baseline offset should be zero when not baseline-aligned");
nscoord sz = aGridItem.mBaselineOffset[aAxis] +
nsLayoutUtils::MinSizeContributionForAxis(axis, aRC, child,
nsLayoutUtils::MIN_ISIZE);
auto unit = style.GetUnit();
if (unit == eStyleUnit_Enumerated ||
(unit == eStyleUnit_Auto &&
child->StyleDisplay()->mOverflowX == NS_STYLE_OVERFLOW_VISIBLE)) {
// Now calculate the "content size" part and return whichever is smaller.
MOZ_ASSERT(unit != eStyleUnit_Enumerated || sz == NS_UNCONSTRAINEDSIZE);
sz = std::min(sz, ContentContribution(aGridItem, aState, aRC, aCBWM, aAxis,
nsLayoutUtils::MIN_ISIZE,
nsLayoutUtils::MIN_INTRINSIC_ISIZE));
}
return sz;
}
void
nsGridContainerFrame::Tracks::CalculateSizes(
GridReflowInput& aState,
nsTArray<GridItemInfo>& aGridItems,
const TrackSizingFunctions& aFunctions,
nscoord aContentBoxSize,
LineRange GridArea::* aRange,
IntrinsicISizeType aConstraint)
{
nscoord percentageBasis = aContentBoxSize;
if (percentageBasis == NS_UNCONSTRAINEDSIZE) {
percentageBasis = 0;
}
InitializeItemBaselines(aState, aGridItems);
ResolveIntrinsicSize(aState, aGridItems, aFunctions, aRange, percentageBasis,
aConstraint);
if (aConstraint != nsLayoutUtils::MIN_ISIZE) {
nscoord freeSpace = aContentBoxSize;
if (freeSpace != NS_UNCONSTRAINEDSIZE) {
freeSpace -= SumOfGridGaps();
}
DistributeFreeSpace(freeSpace);
StretchFlexibleTracks(aState, aGridItems, aFunctions, freeSpace);
}
}
bool
nsGridContainerFrame::Tracks::HasIntrinsicButNoFlexSizingInRange(
const LineRange& aRange,
IntrinsicISizeType aConstraint,
TrackSize::StateBits* aState) const
{
MOZ_ASSERT(!aRange.IsAuto(), "must have a definite range");
const uint32_t start = aRange.mStart;
const uint32_t end = aRange.mEnd;
const TrackSize::StateBits selector =
TrackSize::eIntrinsicMinSizing |
TrackSize::eIntrinsicMaxSizing |
(aConstraint == nsLayoutUtils::MIN_ISIZE ? TrackSize::eFlexMinSizing
: TrackSize::StateBits(0));
bool foundIntrinsic = false;
for (uint32_t i = start; i < end; ++i) {
TrackSize::StateBits state = mSizes[i].mState;
*aState |= state;
if (state & TrackSize::eFlexMaxSizing) {
return false;
}
if (state & selector) {
foundIntrinsic = true;
}
}
return foundIntrinsic;
}
bool
nsGridContainerFrame::Tracks::ResolveIntrinsicSizeStep1(
GridReflowInput& aState,
const TrackSizingFunctions& aFunctions,
nscoord aPercentageBasis,
IntrinsicISizeType aConstraint,
const LineRange& aRange,
const GridItemInfo& aGridItem)
{
Maybe<nscoord> minContentContribution;
Maybe<nscoord> maxContentContribution;
// min sizing
TrackSize& sz = mSizes[aRange.mStart];
WritingMode wm = aState.mWM;
nsRenderingContext* rc = &aState.mRenderingContext;
if (sz.mState & TrackSize::eAutoMinSizing) {
nscoord s = MinSize(aGridItem, aState, rc, wm, mAxis);
sz.mBase = std::max(sz.mBase, s);
} else if ((sz.mState & TrackSize::eMinContentMinSizing) ||
(aConstraint == nsLayoutUtils::MIN_ISIZE &&
(sz.mState & TrackSize::eFlexMinSizing))) {
nscoord s = MinContentContribution(aGridItem, aState, rc, wm, mAxis);
minContentContribution.emplace(s);
sz.mBase = std::max(sz.mBase, minContentContribution.value());
} else if (sz.mState & TrackSize::eMaxContentMinSizing) {
nscoord s = MaxContentContribution(aGridItem, aState, rc, wm, mAxis);
maxContentContribution.emplace(s);
sz.mBase = std::max(sz.mBase, maxContentContribution.value());
}
// max sizing
if (sz.mState & TrackSize::eMinContentMaxSizing) {
if (minContentContribution.isNothing()) {
nscoord s = MinContentContribution(aGridItem, aState, rc, wm, mAxis);
minContentContribution.emplace(s);
}
if (sz.mLimit == NS_UNCONSTRAINEDSIZE) {
sz.mLimit = minContentContribution.value();
} else {
sz.mLimit = std::max(sz.mLimit, minContentContribution.value());
}
} else if (sz.mState & (TrackSize::eAutoMaxSizing |
TrackSize::eMaxContentMaxSizing)) {
if (maxContentContribution.isNothing()) {
nscoord s = MaxContentContribution(aGridItem, aState, rc, wm, mAxis);
maxContentContribution.emplace(s);
}
if (sz.mLimit == NS_UNCONSTRAINEDSIZE) {
sz.mLimit = maxContentContribution.value();
} else {
sz.mLimit = std::max(sz.mLimit, maxContentContribution.value());
}
if (MOZ_UNLIKELY(sz.mState & TrackSize::eFitContent)) {
// Clamp mLimit to the fit-content() size, for §12.5.1.
auto maxCoord = aFunctions.MaxSizingFor(aRange.mStart);
nscoord fitContentClamp =
nsRuleNode::ComputeCoordPercentCalc(maxCoord, aPercentageBasis);
sz.mLimit = std::min(sz.mLimit, fitContentClamp);
}
}
if (sz.mLimit < sz.mBase) {
sz.mLimit = sz.mBase;
}
return sz.mState & TrackSize::eFlexMaxSizing;
}
void
nsGridContainerFrame::Tracks::CalculateItemBaselines(
nsTArray<ItemBaselineData>& aBaselineItems,
BaselineSharingGroup aBaselineGroup)
{
if (aBaselineItems.IsEmpty()) {
return;
}
// Sort the collected items on their baseline track.
std::sort(aBaselineItems.begin(), aBaselineItems.end(),
ItemBaselineData::IsBaselineTrackLessThan);
nscoord maxBaseline = 0;
nscoord maxDescent = 0;
uint32_t currentTrack = kAutoLine; // guaranteed to not match any item
uint32_t trackStartIndex = 0;
for (uint32_t i = 0, len = aBaselineItems.Length(); true ; ++i) {
// Find the maximum baseline and descent in the current track.
if (i != len) {
const ItemBaselineData& item = aBaselineItems[i];
if (currentTrack == item.mBaselineTrack) {
maxBaseline = std::max(maxBaseline, item.mBaseline);
maxDescent = std::max(maxDescent, item.mSize - item.mBaseline);
continue;
}
}
// Iterate the current track again and update the baseline offsets making
// all items baseline-aligned within this group in this track.
for (uint32_t j = trackStartIndex; j < i; ++j) {
const ItemBaselineData& item = aBaselineItems[j];
item.mGridItem->mBaselineOffset[mAxis] = maxBaseline - item.mBaseline;
MOZ_ASSERT(item.mGridItem->mBaselineOffset[mAxis] >= 0);
}
// Store the size of this baseline-aligned subtree.
if (i != 0) {
mSizes[currentTrack].mBaselineSubtreeSize[aBaselineGroup] =
maxBaseline + maxDescent;
}
if (i == len) {
break;
}
// Initialize data for the next track with baseline-aligned items.
const ItemBaselineData& item = aBaselineItems[i];
currentTrack = item.mBaselineTrack;
trackStartIndex = i;
maxBaseline = item.mBaseline;
maxDescent = item.mSize - item.mBaseline;
}
}
void
nsGridContainerFrame::Tracks::InitializeItemBaselines(
GridReflowInput& aState,
nsTArray<GridItemInfo>& aGridItems)
{
nsTArray<ItemBaselineData> firstBaselineItems;
nsTArray<ItemBaselineData> lastBaselineItems;
WritingMode wm = aState.mWM;
nsStyleContext* containerSC = aState.mFrame->StyleContext();
GridItemCSSOrderIterator& iter = aState.mIter;
iter.Reset();
for (; !iter.AtEnd(); iter.Next()) {
nsIFrame* child = *iter;
GridItemInfo& gridItem = aGridItems[iter.GridItemIndex()];
uint32_t baselineTrack = kAutoLine;
auto state = ItemState(0);
auto childWM = child->GetWritingMode();
const bool isOrthogonal = wm.IsOrthogonalTo(childWM);
const bool isInlineAxis = mAxis == eLogicalAxisInline; // i.e. columns
// XXX update the line below to include orthogonal grid/table boxes
// XXX since they have baselines in both dimensions. And flexbox with
// XXX reversed main/cross axis?
const bool itemHasBaselineParallelToTrack = isInlineAxis == isOrthogonal;
if (itemHasBaselineParallelToTrack) {
// [align|justify]-self:[last-]baseline.
auto selfAlignment = isOrthogonal ?
child->StylePosition()->ComputedJustifySelf(containerSC) :
child->StylePosition()->ComputedAlignSelf(containerSC);
selfAlignment &= ~NS_STYLE_ALIGN_FLAG_BITS;
if (selfAlignment == NS_STYLE_ALIGN_BASELINE) {
state |= ItemState::eFirstBaseline | ItemState::eSelfBaseline;
const GridArea& area = gridItem.mArea;
baselineTrack = isOrthogonal ? area.mCols.mStart : area.mRows.mStart;
} else if (selfAlignment == NS_STYLE_ALIGN_LAST_BASELINE) {
state |= ItemState::eLastBaseline | ItemState::eSelfBaseline;
const GridArea& area = gridItem.mArea;
baselineTrack = (isOrthogonal ? area.mCols.mEnd : area.mRows.mEnd) - 1;
}
// [align|justify]-content:[last-]baseline.
// https://drafts.csswg.org/css-align-3/#baseline-align-content
// "[...] and its computed 'align-self' or 'justify-self' (whichever
// affects its block axis) is 'stretch' or 'self-start' ('self-end').
// For this purpose, the 'start', 'end', 'flex-start', and 'flex-end'
// values of 'align-self' are treated as either 'self-start' or
// 'self-end', whichever they end up equivalent to.
auto alignContent = child->StylePosition()->ComputedAlignContent();
alignContent &= ~NS_STYLE_ALIGN_FLAG_BITS;
if (alignContent == NS_STYLE_ALIGN_BASELINE ||
alignContent == NS_STYLE_ALIGN_LAST_BASELINE) {
const auto selfAlignEdge = alignContent == NS_STYLE_ALIGN_BASELINE ?
NS_STYLE_ALIGN_SELF_START : NS_STYLE_ALIGN_SELF_END;
bool validCombo = selfAlignment == NS_STYLE_ALIGN_NORMAL ||
selfAlignment == NS_STYLE_ALIGN_STRETCH ||
selfAlignment == selfAlignEdge;
if (!validCombo) {
// |sameSide| is true if the container's start side in this axis is
// the same as the child's start side, in the child's parallel axis.
// XXX SameSide is way to complicated to use! - add a WritingMode
// XXX method instead that does this in a better way.
auto side = isInlineAxis ? eLogicalSideBStart : eLogicalSideIStart;
// XXX the "isInlineAxis == isOrthogonal" is currently redundant, but
// might be relevant if we change the itemHasBaselineParallelToTrack
// condition above?
auto childSide = isInlineAxis == isOrthogonal ? eLogicalSideIStart
: eLogicalSideBStart;
bool sameSide = SameSide(wm, side, childWM, childSide);
switch (selfAlignment) {
case NS_STYLE_ALIGN_LEFT:
selfAlignment = !isInlineAxis || wm.IsBidiLTR() ? NS_STYLE_ALIGN_START
: NS_STYLE_ALIGN_END;
break;
case NS_STYLE_ALIGN_RIGHT:
selfAlignment = isInlineAxis && wm.IsBidiLTR() ? NS_STYLE_ALIGN_END
: NS_STYLE_ALIGN_START;
break;
}
switch (selfAlignment) {
case NS_STYLE_ALIGN_START:
case NS_STYLE_ALIGN_FLEX_START:
validCombo = sameSide ==
(alignContent == NS_STYLE_ALIGN_BASELINE);
break;
case NS_STYLE_ALIGN_END:
case NS_STYLE_ALIGN_FLEX_END:
validCombo = sameSide ==
(alignContent == NS_STYLE_ALIGN_LAST_BASELINE);
break;
}
}
if (validCombo) {
const GridArea& area = gridItem.mArea;
if (alignContent == NS_STYLE_ALIGN_BASELINE) {
state |= ItemState::eFirstBaseline | ItemState::eContentBaseline;
baselineTrack = isOrthogonal ? area.mCols.mStart : area.mRows.mStart;
} else if (alignContent == NS_STYLE_ALIGN_LAST_BASELINE) {
state |= ItemState::eLastBaseline | ItemState::eContentBaseline;
baselineTrack = (isOrthogonal ? area.mCols.mEnd : area.mRows.mEnd) - 1;
}
}
}
}
if (state & ItemState::eIsBaselineAligned) {
// XXX available size issue
LogicalSize avail(childWM, INFINITE_ISIZE_COORD, NS_UNCONSTRAINEDSIZE);
auto* rc = &aState.mRenderingContext;
// XXX figure out if we can avoid/merge this reflow with the main reflow.
// XXX (after bug 1174569 is sorted out)
::MeasuringReflow(child, aState.mReflowInput, rc, avail);
nscoord baseline;
if (state & ItemState::eFirstBaseline) {
if (nsLayoutUtils::GetFirstLineBaseline(wm, child, &baseline)) {
auto frameSize = isInlineAxis ? child->ISize(wm) : child->BSize(wm);
auto m = child->GetLogicalUsedMargin(wm);
baseline += isInlineAxis ? m.IStart(wm) : m.BStart(wm);
auto alignSize = frameSize + (isInlineAxis ? m.IStartEnd(wm)
: m.BStartEnd(wm));
firstBaselineItems.AppendElement(ItemBaselineData(
{ baselineTrack, baseline, alignSize, &gridItem }));
} else {
state &= ~ItemState::eAllBaselineBits;
}
} else {
if (nsLayoutUtils::GetLastLineBaseline(wm, child, &baseline)) {
auto frameSize = isInlineAxis ? child->ISize(wm) : child->BSize(wm);
auto m = child->GetLogicalUsedMargin(wm);
auto descent = frameSize - baseline + (isInlineAxis ? m.IEnd(wm)
: m.BEnd(wm));
auto alignSize = frameSize + (isInlineAxis ? m.IStartEnd(wm)
: m.BStartEnd(wm));
lastBaselineItems.AppendElement(ItemBaselineData(
{ baselineTrack, descent, alignSize, &gridItem }));
} else {
state &= ~ItemState::eAllBaselineBits;
}
}
}
MOZ_ASSERT((state &
(ItemState::eFirstBaseline | ItemState::eLastBaseline)) !=
(ItemState::eFirstBaseline | ItemState::eLastBaseline),
"baseline and last-baseline bits are mutually exclusive");
MOZ_ASSERT((state &
(ItemState::eSelfBaseline | ItemState::eContentBaseline)) !=
(ItemState::eSelfBaseline | ItemState::eContentBaseline),
"*-self and *-content baseline bits are mutually exclusive");
MOZ_ASSERT(!(state &
(ItemState::eFirstBaseline | ItemState::eLastBaseline)) ==
!(state &
(ItemState::eSelfBaseline | ItemState::eContentBaseline)),
"first/last bit requires self/content bit and vice versa");
gridItem.mState[mAxis] = state;
gridItem.mBaselineOffset[mAxis] = nscoord(0);
}
if (firstBaselineItems.IsEmpty() && lastBaselineItems.IsEmpty()) {
return;
}
// TODO: CSS Align spec issue - how to align a baseline subtree in a track?
// https://lists.w3.org/Archives/Public/www-style/2016May/0141.html
mBaselineSubtreeAlign[BaselineSharingGroup::eFirst] = NS_STYLE_ALIGN_START;
mBaselineSubtreeAlign[BaselineSharingGroup::eLast] = NS_STYLE_ALIGN_END;
CalculateItemBaselines(firstBaselineItems, BaselineSharingGroup::eFirst);
CalculateItemBaselines(lastBaselineItems, BaselineSharingGroup::eLast);
}
void
nsGridContainerFrame::Tracks::AlignBaselineSubtree(
const GridItemInfo& aGridItem) const
{
auto state = aGridItem.mState[mAxis];
if (!(state & ItemState::eIsBaselineAligned)) {
return;
}
const GridArea& area = aGridItem.mArea;
int32_t baselineTrack;
const bool isFirstBaseline = state & ItemState::eFirstBaseline;
if (isFirstBaseline) {
baselineTrack = mAxis == eLogicalAxisBlock ? area.mRows.mStart
: area.mCols.mStart;
} else {
baselineTrack = (mAxis == eLogicalAxisBlock ? area.mRows.mEnd
: area.mCols.mEnd) - 1;
}
const TrackSize& sz = mSizes[baselineTrack];
auto baselineGroup = isFirstBaseline ? BaselineSharingGroup::eFirst
: BaselineSharingGroup::eLast;
nscoord delta = sz.mBase - sz.mBaselineSubtreeSize[baselineGroup];
const auto subtreeAlign = mBaselineSubtreeAlign[baselineGroup];
switch (subtreeAlign) {
case NS_STYLE_ALIGN_START:
if (state & ItemState::eLastBaseline) {
aGridItem.mBaselineOffset[mAxis] += delta;
}
break;
case NS_STYLE_ALIGN_END:
if (isFirstBaseline) {
aGridItem.mBaselineOffset[mAxis] += delta;
}
break;
case NS_STYLE_ALIGN_CENTER:
aGridItem.mBaselineOffset[mAxis] += delta / 2;
break;
default:
MOZ_ASSERT_UNREACHABLE("unexpected baseline subtree alignment");
}
}
void
nsGridContainerFrame::Tracks::ResolveIntrinsicSize(
GridReflowInput& aState,
nsTArray<GridItemInfo>& aGridItems,
const TrackSizingFunctions& aFunctions,
LineRange GridArea::* aRange,
nscoord aPercentageBasis,
IntrinsicISizeType aConstraint)
{
// Some data we collect on each item for Step 2 of the algorithm below.
struct Step2ItemData
{
uint32_t mSpan;
TrackSize::StateBits mState;
LineRange mLineRange;
nscoord mMinSize;
nscoord mMinContentContribution;
nscoord mMaxContentContribution;
nsIFrame* mFrame;
static bool IsSpanLessThan(const Step2ItemData& a, const Step2ItemData& b)
{
return a.mSpan < b.mSpan;
}
};
// Resolve Intrinsic Track Sizes
// http://dev.w3.org/csswg/css-grid/#algo-content
// We're also setting eIsFlexing on the item state here to speed up
// FindUsedFlexFraction later.
AutoTArray<TrackSize::StateBits, 16> stateBitsPerSpan;
nsTArray<Step2ItemData> step2Items;
GridItemCSSOrderIterator& iter = aState.mIter;
nsRenderingContext* rc = &aState.mRenderingContext;
WritingMode wm = aState.mWM;
uint32_t maxSpan = 0; // max span of the step2Items items
const TrackSize::StateBits flexMin =
aConstraint == nsLayoutUtils::MIN_ISIZE ? TrackSize::eFlexMinSizing
: TrackSize::StateBits(0);
iter.Reset();
for (; !iter.AtEnd(); iter.Next()) {
auto& gridItem = aGridItems[iter.GridItemIndex()];
const GridArea& area = gridItem.mArea;
const LineRange& lineRange = area.*aRange;
uint32_t span = lineRange.Extent();
if (span == 1) {
// Step 1. Size tracks to fit non-spanning items.
if (ResolveIntrinsicSizeStep1(aState, aFunctions, aPercentageBasis,
aConstraint, lineRange, gridItem)) {
gridItem.mState[mAxis] |= ItemState::eIsFlexing;
}
} else {
TrackSize::StateBits state = TrackSize::StateBits(0);
if (HasIntrinsicButNoFlexSizingInRange(lineRange, aConstraint, &state)) {
// Collect data for Step 2.
maxSpan = std::max(maxSpan, span);
if (span >= stateBitsPerSpan.Length()) {
uint32_t len = 2 * span;
stateBitsPerSpan.SetCapacity(len);
for (uint32_t i = stateBitsPerSpan.Length(); i < len; ++i) {
stateBitsPerSpan.AppendElement(TrackSize::StateBits(0));
}
}
stateBitsPerSpan[span] |= state;
nscoord minSize = 0;
if (state & (flexMin | TrackSize::eIntrinsicMinSizing)) { // for 2.1
minSize = MinSize(gridItem, aState, rc, wm, mAxis);
}
nscoord minContent = 0;
if (state & (flexMin | TrackSize::eMinOrMaxContentMinSizing | // for 2.2
TrackSize::eIntrinsicMaxSizing)) { // for 2.5
minContent = MinContentContribution(gridItem, aState,
rc, wm, mAxis);
}
nscoord maxContent = 0;
if (state & (TrackSize::eMaxContentMinSizing | // for 2.3
TrackSize::eAutoOrMaxContentMaxSizing)) { // for 2.6
maxContent = MaxContentContribution(gridItem, aState,
rc, wm, mAxis);
}
step2Items.AppendElement(
Step2ItemData({span, state, lineRange, minSize,
minContent, maxContent, *iter}));
} else if (state & TrackSize::eFlexMaxSizing) {
gridItem.mState[mAxis] |= ItemState::eIsFlexing;
}
}
}
// Step 2.
if (maxSpan) {
// Sort the collected items on span length, shortest first.
std::stable_sort(step2Items.begin(), step2Items.end(),
Step2ItemData::IsSpanLessThan);
nsTArray<uint32_t> tracks(maxSpan);
nsTArray<TrackSize> plan(mSizes.Length());
plan.SetLength(mSizes.Length());
for (uint32_t i = 0, len = step2Items.Length(); i < len; ) {
// Start / end index for items of the same span length:
const uint32_t spanGroupStartIndex = i;
uint32_t spanGroupEndIndex = len;
const uint32_t span = step2Items[i].mSpan;
for (++i; i < len; ++i) {
if (step2Items[i].mSpan != span) {
spanGroupEndIndex = i;
break;
}
}
bool updatedBase = false; // Did we update any mBase in step 2.1 - 2.3?
TrackSize::StateBits selector(flexMin | TrackSize::eIntrinsicMinSizing);
if (stateBitsPerSpan[span] & selector) {
// Step 2.1 MinSize to intrinsic min-sizing.
for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
Step2ItemData& item = step2Items[i];
if (!(item.mState & selector)) {
continue;
}
nscoord space = item.mMinSize;
if (space <= 0) {
continue;
}
tracks.ClearAndRetainStorage();
space = CollectGrowable(space, mSizes, item.mLineRange, selector,
tracks);
if (space > 0) {
DistributeToTrackBases(space, plan, tracks, selector);
updatedBase = true;
}
}
}
selector = flexMin | TrackSize::eMinOrMaxContentMinSizing;
if (stateBitsPerSpan[span] & selector) {
// Step 2.2 MinContentContribution to min-/max-content min-sizing.
for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
Step2ItemData& item = step2Items[i];
if (!(item.mState & selector)) {
continue;
}
nscoord space = item.mMinContentContribution;
if (space <= 0) {
continue;
}
tracks.ClearAndRetainStorage();
space = CollectGrowable(space, mSizes, item.mLineRange, selector,
tracks);
if (space > 0) {
DistributeToTrackBases(space, plan, tracks, selector);
updatedBase = true;
}
}
}
if (stateBitsPerSpan[span] & TrackSize::eMaxContentMinSizing) {
// Step 2.3 MaxContentContribution to max-content min-sizing.
for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
Step2ItemData& item = step2Items[i];
if (!(item.mState & TrackSize::eMaxContentMinSizing)) {
continue;
}
nscoord space = item.mMaxContentContribution;
if (space <= 0) {
continue;
}
tracks.ClearAndRetainStorage();
space = CollectGrowable(space, mSizes, item.mLineRange,
TrackSize::eMaxContentMinSizing,
tracks);
if (space > 0) {
DistributeToTrackBases(space, plan, tracks,
TrackSize::eMaxContentMinSizing);
updatedBase = true;
}
}
}
if (updatedBase) {
// Step 2.4
for (TrackSize& sz : mSizes) {
if (sz.mBase > sz.mLimit) {
sz.mLimit = sz.mBase;
}
}
}
if (stateBitsPerSpan[span] & TrackSize::eIntrinsicMaxSizing) {
plan = mSizes;
for (TrackSize& sz : plan) {
if (sz.mLimit == NS_UNCONSTRAINEDSIZE) {
// use mBase as the planned limit
} else {
sz.mBase = sz.mLimit;
}
}
// Step 2.5 MinContentContribution to intrinsic max-sizing.
for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
Step2ItemData& item = step2Items[i];
if (!(item.mState & TrackSize::eIntrinsicMaxSizing)) {
continue;
}
nscoord space = item.mMinContentContribution;
if (space <= 0) {
continue;
}
tracks.ClearAndRetainStorage();
space = CollectGrowable(space, plan, item.mLineRange,
TrackSize::eIntrinsicMaxSizing,
tracks);
if (space > 0) {
DistributeToTrackLimits(space, plan, tracks, aFunctions,
aPercentageBasis);
}
}
for (size_t j = 0, len = mSizes.Length(); j < len; ++j) {
TrackSize& sz = plan[j];
sz.mState &= ~(TrackSize::eFrozen | TrackSize::eSkipGrowUnlimited);
if (sz.mLimit != NS_UNCONSTRAINEDSIZE) {
sz.mLimit = sz.mBase; // collect the results from 2.5
}
}
if (stateBitsPerSpan[span] & TrackSize::eAutoOrMaxContentMaxSizing) {
// Step 2.6 MaxContentContribution to max-content max-sizing.
for (i = spanGroupStartIndex; i < spanGroupEndIndex; ++i) {
Step2ItemData& item = step2Items[i];
if (!(item.mState & TrackSize::eAutoOrMaxContentMaxSizing)) {
continue;
}
nscoord space = item.mMaxContentContribution;
if (space <= 0) {
continue;
}
tracks.ClearAndRetainStorage();
space = CollectGrowable(space, plan, item.mLineRange,
TrackSize::eAutoOrMaxContentMaxSizing,
tracks);
if (space > 0) {
DistributeToTrackLimits(space, plan, tracks, aFunctions,
aPercentageBasis);
}
}
}
}
}
}
// Step 3.
for (TrackSize& sz : mSizes) {
if (sz.mLimit == NS_UNCONSTRAINEDSIZE) {
sz.mLimit = sz.mBase;
}
}
}
float
nsGridContainerFrame::Tracks::FindFrUnitSize(
const LineRange& aRange,
const nsTArray<uint32_t>& aFlexTracks,
const TrackSizingFunctions& aFunctions,
nscoord aSpaceToFill) const
{
MOZ_ASSERT(aSpaceToFill > 0 && !aFlexTracks.IsEmpty());
float flexFactorSum = 0.0f;
nscoord leftOverSpace = aSpaceToFill;
for (uint32_t i = aRange.mStart, end = aRange.mEnd; i < end; ++i) {
const TrackSize& sz = mSizes[i];
if (sz.mState & TrackSize::eFlexMaxSizing) {
flexFactorSum += aFunctions.MaxSizingFor(i).GetFlexFractionValue();
} else {
leftOverSpace -= sz.mBase;
if (leftOverSpace <= 0) {
return 0.0f;
}
}
}
bool restart;
float hypotheticalFrSize;
nsTArray<uint32_t> flexTracks(aFlexTracks);
uint32_t numFlexTracks = flexTracks.Length();
do {
restart = false;
hypotheticalFrSize = leftOverSpace / std::max(flexFactorSum, 1.0f);
for (uint32_t i = 0, len = flexTracks.Length(); i < len; ++i) {
uint32_t track = flexTracks[i];
if (track == kAutoLine) {
continue; // Track marked as inflexible in a prev. iter of this loop.
}
float flexFactor = aFunctions.MaxSizingFor(track).GetFlexFractionValue();
const nscoord base = mSizes[track].mBase;
if (flexFactor * hypotheticalFrSize < base) {
// 12.7.1.4: Treat this track as inflexible.
flexTracks[i] = kAutoLine;
flexFactorSum -= flexFactor;
leftOverSpace -= base;
--numFlexTracks;
if (numFlexTracks == 0 || leftOverSpace <= 0) {
return 0.0f;
}
restart = true;
// break; XXX (bug 1176621 comment 16) measure which is more common
}
}
} while (restart);
return hypotheticalFrSize;
}
float
nsGridContainerFrame::Tracks::FindUsedFlexFraction(
GridReflowInput& aState,
nsTArray<GridItemInfo>& aGridItems,
const nsTArray<uint32_t>& aFlexTracks,
const TrackSizingFunctions& aFunctions,
nscoord aAvailableSize) const
{
if (aAvailableSize != NS_UNCONSTRAINEDSIZE) {
// Use all of the grid tracks and a 'space to fill' of the available space.
const TranslatedLineRange range(0, mSizes.Length());
return FindFrUnitSize(range, aFlexTracks, aFunctions, aAvailableSize);
}
// The used flex fraction is the maximum of:
// ... each flexible track's base size divided by its flex factor
float fr = 0.0f;
for (uint32_t track : aFlexTracks) {
float flexFactor = aFunctions.MaxSizingFor(track).GetFlexFractionValue();
if (flexFactor > 0.0f) {
fr = std::max(fr, mSizes[track].mBase / flexFactor);
}
}
WritingMode wm = aState.mWM;
nsRenderingContext* rc = &aState.mRenderingContext;
GridItemCSSOrderIterator& iter = aState.mIter;
iter.Reset();
// ... the result of 'finding the size of an fr' for each item that spans
// a flex track with its max-content contribution as 'space to fill'
for (; !iter.AtEnd(); iter.Next()) {
const GridItemInfo& item = aGridItems[iter.GridItemIndex()];
if (item.mState[mAxis] & ItemState::eIsFlexing) {
nscoord spaceToFill = MaxContentContribution(item, aState, rc, wm, mAxis);
if (spaceToFill <= 0) {
continue;
}
// ... and all its spanned tracks as input.
const LineRange& range =
mAxis == eLogicalAxisInline ? item.mArea.mCols : item.mArea.mRows;
nsTArray<uint32_t> itemFlexTracks;
for (uint32_t i = range.mStart, end = range.mEnd; i < end; ++i) {
if (mSizes[i].mState & TrackSize::eFlexMaxSizing) {
itemFlexTracks.AppendElement(i);
}
}
float itemFr =
FindFrUnitSize(range, itemFlexTracks, aFunctions, spaceToFill);
fr = std::max(fr, itemFr);
}
}
return fr;
}
void
nsGridContainerFrame::Tracks::StretchFlexibleTracks(
GridReflowInput& aState,
nsTArray<GridItemInfo>& aGridItems,
const TrackSizingFunctions& aFunctions,
nscoord aAvailableSize)
{
if (aAvailableSize <= 0) {
return;
}
nsTArray<uint32_t> flexTracks(mSizes.Length());
for (uint32_t i = 0, len = mSizes.Length(); i < len; ++i) {
if (mSizes[i].mState & TrackSize::eFlexMaxSizing) {
flexTracks.AppendElement(i);
}
}
if (flexTracks.IsEmpty()) {
return;
}
float fr = FindUsedFlexFraction(aState, aGridItems, flexTracks,
aFunctions, aAvailableSize);
if (fr != 0.0f) {
for (uint32_t i : flexTracks) {
float flexFactor = aFunctions.MaxSizingFor(i).GetFlexFractionValue();
nscoord flexLength = NSToCoordRound(flexFactor * fr);
nscoord& base = mSizes[i].mBase;
if (flexLength > base) {
base = flexLength;
}
}
}
}
void
nsGridContainerFrame::Tracks::AlignJustifyContent(
const nsStylePosition* aStyle,
WritingMode aWM,
const LogicalSize& aContainerSize)
{
if (mSizes.IsEmpty()) {
return;
}
const bool isAlign = mAxis == eLogicalAxisBlock;
auto valueAndFallback = isAlign ? aStyle->ComputedAlignContent() :
aStyle->ComputedJustifyContent();
bool overflowSafe;
auto alignment = ::GetAlignJustifyValue(valueAndFallback, aWM, isAlign,
&overflowSafe);
if (alignment == NS_STYLE_ALIGN_NORMAL) {
MOZ_ASSERT(valueAndFallback == NS_STYLE_ALIGN_NORMAL,
"*-content:normal cannot be specified with explicit fallback");
alignment = NS_STYLE_ALIGN_STRETCH;
valueAndFallback = alignment; // we may need a fallback for 'stretch' below
}
// Compute the free space and count auto-sized tracks.
size_t numAutoTracks = 0;
nscoord space;
if (alignment != NS_STYLE_ALIGN_START) {
nscoord trackSizeSum = 0;
for (const TrackSize& sz : mSizes) {
trackSizeSum += sz.mBase;
if (sz.mState & TrackSize::eAutoMaxSizing) {
++numAutoTracks;
}
}
nscoord cbSize = isAlign ? aContainerSize.BSize(aWM)
: aContainerSize.ISize(aWM);
space = cbSize - trackSizeSum - SumOfGridGaps();
// Use the fallback value instead when applicable.
if (space < 0 ||
(alignment == NS_STYLE_ALIGN_SPACE_BETWEEN && mSizes.Length() == 1)) {
auto fallback = ::GetAlignJustifyFallbackIfAny(valueAndFallback, aWM,
isAlign, &overflowSafe);
if (fallback) {
alignment = fallback;
}
}
if (space == 0 || (space < 0 && overflowSafe)) {
// XXX check that this makes sense also for [last-]baseline (bug 1151204).
alignment = NS_STYLE_ALIGN_START;
}
}
// Optimize the cases where we just need to set each track's position.
nscoord pos = 0;
bool distribute = true;
switch (alignment) {
case NS_STYLE_ALIGN_BASELINE:
case NS_STYLE_ALIGN_LAST_BASELINE:
NS_WARNING("'NYI: baseline/last-baseline' (bug 1151204)"); // XXX
MOZ_FALLTHROUGH;
case NS_STYLE_ALIGN_START:
distribute = false;
break;
case NS_STYLE_ALIGN_END:
pos = space;
distribute = false;
break;
case NS_STYLE_ALIGN_CENTER:
pos = space / 2;
distribute = false;
break;
case NS_STYLE_ALIGN_STRETCH:
distribute = numAutoTracks != 0;
break;
}
if (!distribute) {
for (TrackSize& sz : mSizes) {
sz.mPosition = pos;
pos += sz.mBase + mGridGap;
}
return;
}
// Distribute free space to/between tracks and set their position.
MOZ_ASSERT(space > 0, "should've handled that on the fallback path above");
nscoord between, roundingError;
switch (alignment) {
case NS_STYLE_ALIGN_STRETCH: {
MOZ_ASSERT(numAutoTracks > 0, "we handled numAutoTracks == 0 above");
nscoord spacePerTrack;
roundingError = NSCoordDivRem(space, numAutoTracks, &spacePerTrack);
for (TrackSize& sz : mSizes) {
sz.mPosition = pos;
if (!(sz.mState & TrackSize::eAutoMaxSizing)) {
pos += sz.mBase + mGridGap;
continue;
}
nscoord stretch = spacePerTrack;
if (roundingError) {
roundingError -= 1;
stretch += 1;
}
nscoord newBase = sz.mBase + stretch;
sz.mBase = newBase;
pos += newBase + mGridGap;
}
MOZ_ASSERT(!roundingError, "we didn't distribute all rounding error?");
return;
}
case NS_STYLE_ALIGN_SPACE_BETWEEN:
MOZ_ASSERT(mSizes.Length() > 1, "should've used a fallback above");
roundingError = NSCoordDivRem(space, mSizes.Length() - 1, &between);
break;
case NS_STYLE_ALIGN_SPACE_AROUND:
roundingError = NSCoordDivRem(space, mSizes.Length(), &between);
pos = between / 2;
break;
case NS_STYLE_ALIGN_SPACE_EVENLY:
roundingError = NSCoordDivRem(space, mSizes.Length() + 1, &between);
pos = between;
break;
default:
MOZ_ASSERT_UNREACHABLE("unknown align-/justify-content value");
between = 0; // just to avoid a compiler warning
}
between += mGridGap;
for (TrackSize& sz : mSizes) {
sz.mPosition = pos;
nscoord spacing = between;
if (roundingError) {
roundingError -= 1;
spacing += 1;
}
pos += sz.mBase + spacing;
}
MOZ_ASSERT(!roundingError, "we didn't distribute all rounding error?");
}
void
nsGridContainerFrame::LineRange::ToPositionAndLength(
const nsTArray<TrackSize>& aTrackSizes, nscoord* aPos, nscoord* aLength) const
{
MOZ_ASSERT(mStart != kAutoLine && mEnd != kAutoLine,
"expected a definite LineRange");
MOZ_ASSERT(mStart < mEnd);
nscoord startPos = aTrackSizes[mStart].mPosition;
const TrackSize& sz = aTrackSizes[mEnd - 1];
*aPos = startPos;
*aLength = (sz.mPosition + sz.mBase) - startPos;
}
nscoord
nsGridContainerFrame::LineRange::ToLength(
const nsTArray<TrackSize>& aTrackSizes) const
{
MOZ_ASSERT(mStart != kAutoLine && mEnd != kAutoLine,
"expected a definite LineRange");
MOZ_ASSERT(mStart < mEnd);
nscoord startPos = aTrackSizes[mStart].mPosition;
const TrackSize& sz = aTrackSizes[mEnd - 1];
return (sz.mPosition + sz.mBase) - startPos;
}
void
nsGridContainerFrame::LineRange::ToPositionAndLengthForAbsPos(
const Tracks& aTracks, nscoord aGridOrigin,
nscoord* aPos, nscoord* aLength) const
{
// kAutoLine for abspos children contributes the corresponding edge
// of the grid container's padding-box.
if (mEnd == kAutoLine) {
if (mStart == kAutoLine) {
// done
} else {
const nscoord endPos = *aPos + *aLength;
auto side = mStart == aTracks.mSizes.Length() ? GridLineSide::eBeforeGridGap
: GridLineSide::eAfterGridGap;
nscoord startPos = aTracks.GridLineEdge(mStart, side);
*aPos = aGridOrigin + startPos;
*aLength = std::max(endPos - *aPos, 0);
}
} else {
if (mStart == kAutoLine) {
auto side = mEnd == 0 ? GridLineSide::eAfterGridGap
: GridLineSide::eBeforeGridGap;
nscoord endPos = aTracks.GridLineEdge(mEnd, side);
*aLength = std::max(aGridOrigin + endPos, 0);
} else {
nscoord pos;
ToPositionAndLength(aTracks.mSizes, &pos, aLength);
*aPos = aGridOrigin + pos;
}
}
}
LogicalRect
nsGridContainerFrame::GridReflowInput::ContainingBlockFor(const GridArea& aArea) const
{
nscoord i, b, iSize, bSize;
MOZ_ASSERT(aArea.mCols.Extent() > 0, "grid items cover at least one track");
MOZ_ASSERT(aArea.mRows.Extent() > 0, "grid items cover at least one track");
aArea.mCols.ToPositionAndLength(mCols.mSizes, &i, &iSize);
aArea.mRows.ToPositionAndLength(mRows.mSizes, &b, &bSize);
return LogicalRect(mWM, i, b, iSize, bSize);
}
LogicalRect
nsGridContainerFrame::GridReflowInput::ContainingBlockForAbsPos(
const GridArea& aArea,
const LogicalPoint& aGridOrigin,
const LogicalRect& aGridCB) const
{
nscoord i = aGridCB.IStart(mWM);
nscoord b = aGridCB.BStart(mWM);
nscoord iSize = aGridCB.ISize(mWM);
nscoord bSize = aGridCB.BSize(mWM);
aArea.mCols.ToPositionAndLengthForAbsPos(mCols, aGridOrigin.I(mWM),
&i, &iSize);
aArea.mRows.ToPositionAndLengthForAbsPos(mRows, aGridOrigin.B(mWM),
&b, &bSize);
return LogicalRect(mWM, i, b, iSize, bSize);
}
/**
* Return a Fragmentainer object if we have a fragmentainer frame in our
* ancestor chain of containing block (CB) reflow states. We'll only
* continue traversing the ancestor chain as long as the CBs have
* the same writing-mode and have overflow:visible.
*/
Maybe<nsGridContainerFrame::Fragmentainer>
nsGridContainerFrame::GetNearestFragmentainer(const GridReflowInput& aState) const
{
Maybe<nsGridContainerFrame::Fragmentainer> data;
const ReflowInput* gridRI = aState.mReflowInput;
if (gridRI->AvailableBSize() == NS_UNCONSTRAINEDSIZE) {
return data;
}
WritingMode wm = aState.mWM;
const ReflowInput* cbRI = gridRI->mCBReflowInput;
for ( ; cbRI; cbRI = cbRI->mCBReflowInput) {
nsIScrollableFrame* sf = do_QueryFrame(cbRI->mFrame);
if (sf) {
break;
}
if (wm.IsOrthogonalTo(cbRI->GetWritingMode())) {
break;
}
nsIAtom* frameType = cbRI->mFrame->GetType();
if ((frameType == nsGkAtoms::canvasFrame &&
PresContext()->IsPaginated()) ||
frameType == nsGkAtoms::columnSetFrame) {
data.emplace();
data->mIsTopOfPage = gridRI->mFlags.mIsTopOfPage;
data->mToFragmentainerEnd = aState.mFragBStart +
gridRI->AvailableBSize() - aState.mBorderPadding.BStart(wm);
const auto numRows = aState.mRows.mSizes.Length();
data->mCanBreakAtStart =
numRows > 0 && aState.mRows.mSizes[0].mPosition > 0;
nscoord bSize = gridRI->ComputedBSize();
data->mIsAutoBSize = bSize == NS_AUTOHEIGHT;
if (data->mIsAutoBSize) {
bSize = gridRI->ComputedMinBSize();
} else {
bSize = NS_CSS_MINMAX(bSize,
gridRI->ComputedMinBSize(),
gridRI->ComputedMaxBSize());
}
nscoord gridEnd =
aState.mRows.GridLineEdge(numRows, GridLineSide::eBeforeGridGap);
data->mCanBreakAtEnd = bSize > gridEnd &&
bSize > aState.mFragBStart;
break;
}
}
return data;
}
void
nsGridContainerFrame::ReflowInFlowChild(nsIFrame* aChild,
const GridItemInfo* aGridItemInfo,
nsSize aContainerSize,
Maybe<nscoord> aStretchBSize,
const Fragmentainer* aFragmentainer,
const GridReflowInput& aState,
const LogicalRect& aContentArea,
ReflowOutput& aDesiredSize,
nsReflowStatus& aStatus)
{
nsPresContext* pc = PresContext();
nsStyleContext* containerSC = StyleContext();
WritingMode wm = aState.mReflowInput->GetWritingMode();
LogicalMargin pad(aState.mReflowInput->ComputedLogicalPadding());
const LogicalPoint padStart(wm, pad.IStart(wm), pad.BStart(wm));
const bool isGridItem = !!aGridItemInfo;
MOZ_ASSERT(isGridItem == (aChild->GetType() != nsGkAtoms::placeholderFrame));
LogicalRect cb(wm);
WritingMode childWM = aChild->GetWritingMode();
bool isConstrainedBSize = false;
nscoord toFragmentainerEnd;
// The part of the child's grid area that's in previous container fragments.
nscoord consumedGridAreaBSize = 0;
const bool isOrthogonal = wm.IsOrthogonalTo(childWM);
if (MOZ_LIKELY(isGridItem)) {
MOZ_ASSERT(aGridItemInfo->mFrame == aChild);
const GridArea& area = aGridItemInfo->mArea;
MOZ_ASSERT(area.IsDefinite());
cb = aState.ContainingBlockFor(area);
isConstrainedBSize = aFragmentainer && !wm.IsOrthogonalTo(childWM);
if (isConstrainedBSize) {
// |gridAreaBOffset| is the offset of the child's grid area in this
// container fragment (if negative, that distance is the child CB size
// consumed in previous container fragments). Note that cb.BStart
// (initially) and aState.mFragBStart are in "global" grid coordinates
// (like all track positions).
nscoord gridAreaBOffset = cb.BStart(wm) - aState.mFragBStart;
consumedGridAreaBSize = std::max(0, -gridAreaBOffset);
cb.BStart(wm) = std::max(0, gridAreaBOffset);
toFragmentainerEnd = aFragmentainer->mToFragmentainerEnd -
aState.mFragBStart - cb.BStart(wm);
toFragmentainerEnd = std::max(toFragmentainerEnd, 0);
}
cb += aContentArea.Origin(wm);
aState.mRows.AlignBaselineSubtree(*aGridItemInfo);
aState.mCols.AlignBaselineSubtree(*aGridItemInfo);
// Setup [align|justify]-content:[last-]baseline related frame properties.
// These are added to the padding in SizeComputationInput::InitOffsets.
// (a negative value signals the value is for 'last-baseline' and should be
// added to the (logical) end padding)
typedef const FramePropertyDescriptor<SmallValueHolder<nscoord>>* Prop;
auto SetProp = [aGridItemInfo, aChild] (LogicalAxis aGridAxis,
Prop aProp) {
auto state = aGridItemInfo->mState[aGridAxis];
auto baselineAdjust = (state & ItemState::eContentBaseline) ?
aGridItemInfo->mBaselineOffset[aGridAxis] : nscoord(0);
if (baselineAdjust < nscoord(0)) {
// This happens when the subtree overflows its track.
// XXX spec issue? it's unclear how to handle this.
baselineAdjust = nscoord(0);
} else if (baselineAdjust > nscoord(0) &&
(state & ItemState::eLastBaseline)) {
baselineAdjust = -baselineAdjust;
}
if (baselineAdjust != nscoord(0)) {
aChild->Properties().Set(aProp, baselineAdjust);
} else {
aChild->Properties().Delete(aProp);
}
};
SetProp(eLogicalAxisBlock, isOrthogonal ? IBaselinePadProperty() :
BBaselinePadProperty());
SetProp(eLogicalAxisInline, isOrthogonal ? BBaselinePadProperty() :
IBaselinePadProperty());
} else {
cb = aContentArea;
}
LogicalSize reflowSize(cb.Size(wm));
if (isConstrainedBSize) {
reflowSize.BSize(wm) = toFragmentainerEnd;
}
LogicalSize childCBSize = reflowSize.ConvertTo(childWM, wm);
if (!isConstrainedBSize) {
childCBSize.BSize(childWM) = NS_UNCONSTRAINEDSIZE;
}
LogicalSize percentBasis(cb.Size(wm).ConvertTo(childWM, wm));
ReflowInput childRI(pc, *aState.mReflowInput, aChild, childCBSize,
&percentBasis);
childRI.mFlags.mIsTopOfPage = aFragmentainer ? aFragmentainer->mIsTopOfPage : false;
// If the child is stretching in its block axis, and we might be fragmenting
// it in that axis, then setup a frame property to tell
// nsBlockFrame::ComputeFinalSize the size.
if (isConstrainedBSize && !wm.IsOrthogonalTo(childWM)) {
bool stretch = false;
if (!childRI.mStyleMargin->HasBlockAxisAuto(childWM) &&
childRI.mStylePosition->BSize(childWM).GetUnit() == eStyleUnit_Auto) {
auto blockAxisAlignment =
childRI.mStylePosition->ComputedAlignSelf(StyleContext());
if (blockAxisAlignment == NS_STYLE_ALIGN_NORMAL ||
blockAxisAlignment == NS_STYLE_ALIGN_STRETCH) {
stretch = true;
}
}
if (stretch) {
aChild->Properties().Set(FragStretchBSizeProperty(), *aStretchBSize);
} else {
aChild->Properties().Delete(FragStretchBSizeProperty());
}
}
// We need the width of the child before we can correctly convert
// the writing-mode of its origin, so we reflow at (0, 0) using a dummy
// aContainerSize, and then pass the correct position to FinishReflowChild.
ReflowOutput childSize(childRI);
const nsSize dummyContainerSize;
ReflowChild(aChild, pc, childSize, childRI, childWM, LogicalPoint(childWM),
dummyContainerSize, 0, aStatus);
LogicalPoint childPos =
cb.Origin(wm).ConvertTo(childWM, wm,
aContainerSize - childSize.PhysicalSize());
// Apply align/justify-self and reflow again if that affects the size.
if (MOZ_LIKELY(isGridItem)) {
LogicalSize size = childSize.Size(childWM); // from the ReflowChild()
if (NS_FRAME_IS_COMPLETE(aStatus)) {
auto align = childRI.mStylePosition->ComputedAlignSelf(containerSC);
auto state = aGridItemInfo->mState[eLogicalAxisBlock];
if (state & ItemState::eContentBaseline) {
align = (state & ItemState::eFirstBaseline) ? NS_STYLE_ALIGN_SELF_START
: NS_STYLE_ALIGN_SELF_END;
}
nscoord cbsz = cb.BSize(wm) - consumedGridAreaBSize;
AlignSelf(*aGridItemInfo, align, cbsz, wm, childRI, size, &childPos);
}
auto justify = childRI.mStylePosition->ComputedJustifySelf(containerSC);
auto state = aGridItemInfo->mState[eLogicalAxisInline];
if (state & ItemState::eContentBaseline) {
justify = (state & ItemState::eFirstBaseline) ? NS_STYLE_JUSTIFY_SELF_START
: NS_STYLE_JUSTIFY_SELF_END;
}
nscoord cbsz = cb.ISize(wm);
JustifySelf(*aGridItemInfo, justify, cbsz, wm, childRI, size, &childPos);
} else {
// Put a placeholder at the padding edge, in case an ancestor is its CB.
childPos -= padStart;
}
childRI.ApplyRelativePositioning(&childPos, aContainerSize);
FinishReflowChild(aChild, pc, childSize, &childRI, childWM, childPos,
aContainerSize, 0);
ConsiderChildOverflow(aDesiredSize.mOverflowAreas, aChild);
}
nscoord
nsGridContainerFrame::ReflowInFragmentainer(GridReflowInput& aState,
const LogicalRect& aContentArea,
ReflowOutput& aDesiredSize,
nsReflowStatus& aStatus,
Fragmentainer& aFragmentainer,
const nsSize& aContainerSize)
{
MOZ_ASSERT(aStatus == NS_FRAME_COMPLETE);
MOZ_ASSERT(aState.mReflowInput);
// Collect our grid items and sort them in row order. Collect placeholders
// and put them in a separate array.
nsTArray<const GridItemInfo*> sortedItems(aState.mGridItems.Length());
nsTArray<nsIFrame*> placeholders(aState.mAbsPosItems.Length());
aState.mIter.Reset(GridItemCSSOrderIterator::eIncludeAll);
for (; !aState.mIter.AtEnd(); aState.mIter.Next()) {
nsIFrame* child = *aState.mIter;
if (child->GetType() != nsGkAtoms::placeholderFrame) {
const GridItemInfo* info = &aState.mGridItems[aState.mIter.GridItemIndex()];
sortedItems.AppendElement(info);
} else {
placeholders.AppendElement(child);
}
}
// NOTE: no need to use stable_sort here, there are no dependencies on
// having content order between items on the same row in the code below.
std::sort(sortedItems.begin(), sortedItems.end(),
GridItemInfo::IsStartRowLessThan);
// Reflow our placeholder children; they must all be complete.
for (auto child : placeholders) {
nsReflowStatus childStatus;
ReflowInFlowChild(child, nullptr, aContainerSize, Nothing(), &aFragmentainer,
aState, aContentArea, aDesiredSize, childStatus);
MOZ_ASSERT(NS_FRAME_IS_COMPLETE(childStatus),
"nsPlaceholderFrame should never need to be fragmented");
}
// The available size for children - we'll set this to the edge of the last
// row in most cases below, but for now use the full size.
nscoord childAvailableSize = aFragmentainer.mToFragmentainerEnd;
const uint32_t startRow = aState.mStartRow;
const uint32_t numRows = aState.mRows.mSizes.Length();
bool isBDBClone = aState.mReflowInput->mStyleBorder->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Clone;
nscoord bpBEnd = aState.mBorderPadding.BEnd(aState.mWM);
// Set |endRow| to the first row that doesn't fit.
uint32_t endRow = numRows;
for (uint32_t row = startRow; row < numRows; ++row) {
auto& sz = aState.mRows.mSizes[row];
const nscoord bEnd = sz.mPosition + sz.mBase;
nscoord remainingAvailableSize = childAvailableSize - bEnd;
if (remainingAvailableSize < 0 ||
(isBDBClone && remainingAvailableSize < bpBEnd)) {
endRow = row;
break;
}
}
// Check for forced breaks on the items.
const bool isTopOfPage = aFragmentainer.mIsTopOfPage;
bool isForcedBreak = false;
const bool avoidBreakInside = ShouldAvoidBreakInside(*aState.mReflowInput);
for (const GridItemInfo* info : sortedItems) {
uint32_t itemStartRow = info->mArea.mRows.mStart;
if (itemStartRow == endRow) {
break;
}
auto disp = info->mFrame->StyleDisplay();
if (disp->mBreakBefore) {
// Propagate break-before on the first row to the container unless we're
// already at top-of-page.
if ((itemStartRow == 0 && !isTopOfPage) || avoidBreakInside) {
aStatus = NS_INLINE_LINE_BREAK_BEFORE();
return aState.mFragBStart;
}
if ((itemStartRow > startRow ||
(itemStartRow == startRow && !isTopOfPage)) &&
itemStartRow < endRow) {
endRow = itemStartRow;
isForcedBreak = true;
// reset any BREAK_AFTER we found on an earlier item
aStatus = NS_FRAME_COMPLETE;
break; // we're done since the items are sorted in row order
}
}
uint32_t itemEndRow = info->mArea.mRows.mEnd;
if (disp->mBreakAfter) {
if (itemEndRow != numRows) {
if (itemEndRow > startRow && itemEndRow < endRow) {
endRow = itemEndRow;
isForcedBreak = true;
// No "break;" here since later items with break-after may have
// a shorter span.
}
} else {
// Propagate break-after on the last row to the container, we may still
// find a break-before on this row though (and reset aStatus).
aStatus = NS_INLINE_LINE_BREAK_AFTER(aStatus); // tentative
}
}
}
// Consume at least one row in each fragment until we have consumed them all.
// Except for the first row if there's a break opportunity before it.
if (startRow == endRow && startRow != numRows &&
(startRow != 0 || !aFragmentainer.mCanBreakAtStart)) {
++endRow;
}
// Honor break-inside:avoid if we can't fit all rows.
if (avoidBreakInside && endRow < numRows) {
aStatus = NS_INLINE_LINE_BREAK_BEFORE();
return aState.mFragBStart;
}
// Calculate the block-size including this fragment.
nscoord bEndRow =
aState.mRows.GridLineEdge(endRow, GridLineSide::eBeforeGridGap);
nscoord bSize;
if (aFragmentainer.mIsAutoBSize) {
// We only apply min-bsize once all rows are complete (when bsize is auto).
if (endRow < numRows) {
bSize = bEndRow;
auto clampedBSize = ClampToCSSMaxBSize(bSize, aState.mReflowInput);
if (MOZ_UNLIKELY(clampedBSize != bSize)) {
// We apply max-bsize in all fragments though.
bSize = clampedBSize;
} else if (!isBDBClone) {
// The max-bsize won't make this fragment COMPLETE, so the block-end
// border will be in a later fragment.
bpBEnd = 0;
}
} else {
bSize = NS_CSS_MINMAX(bEndRow,
aState.mReflowInput->ComputedMinBSize(),
aState.mReflowInput->ComputedMaxBSize());
}
} else {
bSize = NS_CSS_MINMAX(aState.mReflowInput->ComputedBSize(),
aState.mReflowInput->ComputedMinBSize(),
aState.mReflowInput->ComputedMaxBSize());
}
// Check for overflow and set aStatus INCOMPLETE if so.
bool overflow = bSize + bpBEnd > childAvailableSize;
if (overflow) {
if (avoidBreakInside) {
aStatus = NS_INLINE_LINE_BREAK_BEFORE();
return aState.mFragBStart;
}
bool breakAfterLastRow = endRow == numRows && aFragmentainer.mCanBreakAtEnd;
if (breakAfterLastRow) {
MOZ_ASSERT(bEndRow < bSize, "bogus aFragmentainer.mCanBreakAtEnd");
nscoord availableSize = childAvailableSize;
if (isBDBClone) {
availableSize -= bpBEnd;
}
// Pretend we have at least 1px available size, otherwise we'll never make
// progress in consuming our bSize.
availableSize = std::max(availableSize,
aState.mFragBStart + AppUnitsPerCSSPixel());
// Fill the fragmentainer, but not more than our desired block-size and
// at least to the size of the last row (even if that overflows).
nscoord newBSize = std::min(bSize, availableSize);
newBSize = std::max(newBSize, bEndRow);
// If it's just the border+padding that is overflowing and we have
// box-decoration-break:clone then we are technically COMPLETE. There's
// no point in creating another zero-bsize fragment in this case.
if (newBSize < bSize || !isBDBClone) {
NS_FRAME_SET_INCOMPLETE(aStatus);
}
bSize = newBSize;
} else if (bSize <= bEndRow && startRow + 1 < endRow) {
if (endRow == numRows) {
// We have more than one row in this fragment, so we can break before
// the last row instead.
--endRow;
bEndRow = aState.mRows.GridLineEdge(endRow, GridLineSide::eBeforeGridGap);
bSize = bEndRow;
if (aFragmentainer.mIsAutoBSize) {
bSize = ClampToCSSMaxBSize(bSize, aState.mReflowInput);
}
}
NS_FRAME_SET_INCOMPLETE(aStatus);
} else if (endRow < numRows) {
bSize = ClampToCSSMaxBSize(bEndRow, aState.mReflowInput, &aStatus);
} // else - no break opportunities.
} else {
// Even though our block-size fits we need to honor forced breaks, or if
// a row doesn't fit in an auto-sized container (unless it's constrained
// by a max-bsize which make us overflow-incomplete).
if (endRow < numRows && (isForcedBreak ||
(aFragmentainer.mIsAutoBSize && bEndRow == bSize))) {
bSize = ClampToCSSMaxBSize(bEndRow, aState.mReflowInput, &aStatus);
}
}
// If we can't fit all rows then we're at least overflow-incomplete.
if (endRow < numRows) {
childAvailableSize = bEndRow;
if (NS_FRAME_IS_COMPLETE(aStatus)) {
NS_FRAME_SET_OVERFLOW_INCOMPLETE(aStatus);
aStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
}
} else {
// Children always have the full size of the rows in this fragment.
childAvailableSize = std::max(childAvailableSize, bEndRow);
}
return ReflowRowsInFragmentainer(aState, aContentArea, aDesiredSize, aStatus,
aFragmentainer, aContainerSize, sortedItems,
startRow, endRow, bSize, childAvailableSize);
}
nscoord
nsGridContainerFrame::ReflowRowsInFragmentainer(
GridReflowInput& aState,
const LogicalRect& aContentArea,
ReflowOutput& aDesiredSize,
nsReflowStatus& aStatus,
Fragmentainer& aFragmentainer,
const nsSize& aContainerSize,
const nsTArray<const GridItemInfo*>& aSortedItems,
uint32_t aStartRow,
uint32_t aEndRow,
nscoord aBSize,
nscoord aAvailableSize)
{
FrameHashtable pushedItems;
FrameHashtable incompleteItems;
FrameHashtable overflowIncompleteItems;
bool isBDBClone = aState.mReflowInput->mStyleBorder->mBoxDecorationBreak ==
StyleBoxDecorationBreak::Clone;
bool didGrowRow = false;
// As we walk across rows, we track whether the current row is at the top
// of its grid-fragment, to help decide whether we can break before it. When
// this function starts, our row is at the top of the current fragment if:
// - we're starting with a nonzero row (i.e. we're a continuation)
// OR:
// - we're starting with the first row, & we're not allowed to break before
// it (which makes it effectively at the top of its grid-fragment).
bool isRowTopOfPage = aStartRow != 0 || !aFragmentainer.mCanBreakAtStart;
const bool isStartRowTopOfPage = isRowTopOfPage;
// Save our full available size for later.
const nscoord gridAvailableSize = aFragmentainer.mToFragmentainerEnd;
// Propagate the constrained size to our children.
aFragmentainer.mToFragmentainerEnd = aAvailableSize;
// Reflow the items in row order up to |aEndRow| and push items after that.
uint32_t row = 0;
// |i| is intentionally signed, so we can set it to -1 to restart the loop.
for (int32_t i = 0, len = aSortedItems.Length(); i < len; ++i) {
const GridItemInfo* const info = aSortedItems[i];
nsIFrame* child = info->mFrame;
row = info->mArea.mRows.mStart;
MOZ_ASSERT(child->GetPrevInFlow() ? row < aStartRow : row >= aStartRow,
"unexpected child start row");
if (row >= aEndRow) {
pushedItems.PutEntry(child);
continue;
}
bool rowCanGrow = false;
nscoord maxRowSize = 0;
if (row >= aStartRow) {
if (row > aStartRow) {
isRowTopOfPage = false;
}
// Can we grow this row? Only consider span=1 items per spec...
rowCanGrow = !didGrowRow && info->mArea.mRows.Extent() == 1;
if (rowCanGrow) {
auto& sz = aState.mRows.mSizes[row];
// and only min-/max-content rows or flex rows in an auto-sized container
rowCanGrow = (sz.mState & TrackSize::eMinOrMaxContentMinSizing) ||
((sz.mState & TrackSize::eFlexMaxSizing) &&
aFragmentainer.mIsAutoBSize);
if (rowCanGrow) {
if (isBDBClone) {
maxRowSize = gridAvailableSize -
aState.mBorderPadding.BEnd(aState.mWM);
} else {
maxRowSize = gridAvailableSize;
}
maxRowSize -= sz.mPosition;
// ...and only if there is space for it to grow.
rowCanGrow = maxRowSize > sz.mBase;
}
}
}
// aFragmentainer.mIsTopOfPage is propagated to the child reflow state.
// When it's false the child can request BREAK_BEFORE. We intentionally
// set it to false when the row is growable (as determined in CSS Grid
// Fragmentation) and there is a non-zero space between it and the
// fragmentainer end (that can be used to grow it). If the child reports
// a forced break in this case, we grow this row to fill the fragment and
// restart the loop. We also restart the loop with |aEndRow = row|
// (but without growing any row) for a BREAK_BEFORE child if it spans
// beyond the last row in this fragment. This is to avoid fragmenting it.
// We only restart the loop once.
aFragmentainer.mIsTopOfPage = isRowTopOfPage && !rowCanGrow;
nsReflowStatus childStatus;
// Pass along how much to stretch this fragment, in case it's needed.
nscoord bSize =
aState.mRows.GridLineEdge(std::min(aEndRow, info->mArea.mRows.mEnd),
GridLineSide::eBeforeGridGap) -
aState.mRows.GridLineEdge(std::max(aStartRow, row),
GridLineSide::eAfterGridGap);
ReflowInFlowChild(child, info, aContainerSize, Some(bSize), &aFragmentainer,
aState, aContentArea, aDesiredSize, childStatus);
MOZ_ASSERT(NS_INLINE_IS_BREAK_BEFORE(childStatus) ||
!NS_FRAME_IS_FULLY_COMPLETE(childStatus) ||
!child->GetNextInFlow(),
"fully-complete reflow should destroy any NIFs");
if (NS_INLINE_IS_BREAK_BEFORE(childStatus)) {
MOZ_ASSERT(!child->GetPrevInFlow(),
"continuations should never report BREAK_BEFORE status");
MOZ_ASSERT(!aFragmentainer.mIsTopOfPage,
"got NS_INLINE_IS_BREAK_BEFORE at top of page");
if (!didGrowRow) {
if (rowCanGrow) {
// Grow this row and restart with the next row as |aEndRow|.
aState.mRows.ResizeRow(row, maxRowSize);
if (aState.mSharedGridData) {
aState.mSharedGridData->mRows.ResizeRow(row, maxRowSize);
}
didGrowRow = true;
aEndRow = row + 1; // growing this row makes the next one not fit
i = -1; // i == 0 after the next loop increment
isRowTopOfPage = isStartRowTopOfPage;
overflowIncompleteItems.Clear();
incompleteItems.Clear();
nscoord bEndRow =
aState.mRows.GridLineEdge(aEndRow, GridLineSide::eBeforeGridGap);
aFragmentainer.mToFragmentainerEnd = bEndRow;
if (aFragmentainer.mIsAutoBSize) {
aBSize = ClampToCSSMaxBSize(bEndRow, aState.mReflowInput, &aStatus);
} else if (NS_FRAME_IS_NOT_COMPLETE(aStatus)) {
aBSize = NS_CSS_MINMAX(aState.mReflowInput->ComputedBSize(),
aState.mReflowInput->ComputedMinBSize(),
aState.mReflowInput->ComputedMaxBSize());
aBSize = std::min(bEndRow, aBSize);
}
continue;
}
if (!isRowTopOfPage) {
// We can break before this row - restart with it as the new end row.
aEndRow = row;
aBSize = aState.mRows.GridLineEdge(aEndRow, GridLineSide::eBeforeGridGap);
i = -1; // i == 0 after the next loop increment
isRowTopOfPage = isStartRowTopOfPage;
overflowIncompleteItems.Clear();
incompleteItems.Clear();
NS_FRAME_SET_INCOMPLETE(aStatus);
continue;
}
NS_ERROR("got BREAK_BEFORE at top-of-page");
childStatus = NS_FRAME_COMPLETE;
} else {
NS_ERROR("got BREAK_BEFORE again after growing the row?");
NS_FRAME_SET_INCOMPLETE(childStatus);
}
} else if (NS_INLINE_IS_BREAK_AFTER(childStatus)) {
MOZ_ASSERT_UNREACHABLE("unexpected child reflow status");
}
if (NS_FRAME_IS_NOT_COMPLETE(childStatus)) {
incompleteItems.PutEntry(child);
} else if (!NS_FRAME_IS_FULLY_COMPLETE(childStatus)) {
overflowIncompleteItems.PutEntry(child);
}
}
// Record a break before |aEndRow|.
if (aEndRow < aState.mRows.mSizes.Length()) {
aState.mRows.BreakBeforeRow(aEndRow);
if (aState.mSharedGridData) {
aState.mSharedGridData->mRows.BreakBeforeRow(aEndRow);
}
}
if (!pushedItems.IsEmpty() ||
!incompleteItems.IsEmpty() ||
!overflowIncompleteItems.IsEmpty()) {
if (NS_FRAME_IS_COMPLETE(aStatus)) {
NS_FRAME_SET_OVERFLOW_INCOMPLETE(aStatus);
aStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
}
// Iterate the children in normal document order and append them (or a NIF)
// to one of the following frame lists according to their status.
nsFrameList pushedList;
nsFrameList incompleteList;
nsFrameList overflowIncompleteList;
auto* pc = PresContext();
auto* fc = pc->PresShell()->FrameConstructor();
for (nsIFrame* child = GetChildList(kPrincipalList).FirstChild(); child; ) {
MOZ_ASSERT((pushedItems.Contains(child) ? 1 : 0) +
(incompleteItems.Contains(child) ? 1 : 0) +
(overflowIncompleteItems.Contains(child) ? 1 : 0) <= 1,
"child should only be in one of these sets");
// Save the next-sibling so we can continue the loop if |child| is moved.
nsIFrame* next = child->GetNextSibling();
if (pushedItems.Contains(child)) {
MOZ_ASSERT(child->GetParent() == this);
StealFrame(child);
pushedList.AppendFrame(nullptr, child);
} else if (incompleteItems.Contains(child)) {
nsIFrame* childNIF = child->GetNextInFlow();
if (!childNIF) {
childNIF = fc->CreateContinuingFrame(pc, child, this);
incompleteList.AppendFrame(nullptr, childNIF);
} else {
auto parent = static_cast<nsGridContainerFrame*>(childNIF->GetParent());
MOZ_ASSERT(parent != this || !mFrames.ContainsFrame(childNIF),
"child's NIF shouldn't be in the same principal list");
// If child's existing NIF is an overflow container, convert it to an
// actual NIF, since now |child| has non-overflow stuff to give it.
// Or, if it's further away then our next-in-flow, then pull it up.
if ((childNIF->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER) ||
(parent != this && parent != GetNextInFlow())) {
parent->StealFrame(childNIF);
childNIF->RemoveStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
if (parent == this) {
incompleteList.AppendFrame(nullptr, childNIF);
} else {
// If childNIF already lives on the next grid fragment, then we
// don't need to reparent it, since we know it's destined to end
// up there anyway. Just move it to its parent's overflow list.
if (parent == GetNextInFlow()) {
nsFrameList toMove(childNIF, childNIF);
parent->MergeSortedOverflow(toMove);
} else {
ReparentFrame(childNIF, parent, this);
incompleteList.AppendFrame(nullptr, childNIF);
}
}
}
}
} else if (overflowIncompleteItems.Contains(child)) {
nsIFrame* childNIF = child->GetNextInFlow();
if (!childNIF) {
childNIF = fc->CreateContinuingFrame(pc, child, this);
childNIF->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
overflowIncompleteList.AppendFrame(nullptr, childNIF);
} else {
DebugOnly<nsGridContainerFrame*> lastParent = this;
auto nif = static_cast<nsGridContainerFrame*>(GetNextInFlow());
// If child has any non-overflow-container NIFs, convert them to
// overflow containers, since that's all |child| needs now.
while (childNIF &&
!childNIF->HasAnyStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER)) {
auto parent = static_cast<nsGridContainerFrame*>(childNIF->GetParent());
parent->StealFrame(childNIF);
childNIF->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
if (parent == this) {
overflowIncompleteList.AppendFrame(nullptr, childNIF);
} else {
if (!nif || parent == nif) {
nsFrameList toMove(childNIF, childNIF);
parent->MergeSortedExcessOverflowContainers(toMove);
} else {
ReparentFrame(childNIF, parent, nif);
nsFrameList toMove(childNIF, childNIF);
nif->MergeSortedExcessOverflowContainers(toMove);
}
// We only need to reparent the first childNIF (or not at all if
// its parent is our NIF).
nif = nullptr;
}
lastParent = parent;
childNIF = childNIF->GetNextInFlow();
}
}
}
child = next;
}
// Merge the results into our respective overflow child lists.
if (!pushedList.IsEmpty()) {
MergeSortedOverflow(pushedList);
AddStateBits(NS_STATE_GRID_DID_PUSH_ITEMS);
}
if (!incompleteList.IsEmpty()) {
MergeSortedOverflow(incompleteList);
}
if (!overflowIncompleteList.IsEmpty()) {
MergeSortedExcessOverflowContainers(overflowIncompleteList);
}
}
return aBSize;
}
nscoord
nsGridContainerFrame::ReflowChildren(GridReflowInput& aState,
const LogicalRect& aContentArea,
ReflowOutput& aDesiredSize,
nsReflowStatus& aStatus)
{
MOZ_ASSERT(aState.mReflowInput);
aStatus = NS_FRAME_COMPLETE;
nsOverflowAreas ocBounds;
nsReflowStatus ocStatus = NS_FRAME_COMPLETE;
if (GetPrevInFlow()) {
ReflowOverflowContainerChildren(PresContext(), *aState.mReflowInput,
ocBounds, 0, ocStatus,
MergeSortedFrameListsFor);
}
WritingMode wm = aState.mReflowInput->GetWritingMode();
const nsSize containerSize =
(aContentArea.Size(wm) + aState.mBorderPadding.Size(wm)).GetPhysicalSize(wm);
nscoord bSize = aContentArea.BSize(wm);
Maybe<Fragmentainer> fragmentainer = GetNearestFragmentainer(aState);
if (MOZ_UNLIKELY(fragmentainer.isSome())) {
bSize = ReflowInFragmentainer(aState, aContentArea, aDesiredSize, aStatus,
*fragmentainer, containerSize);
} else {
aState.mIter.Reset(GridItemCSSOrderIterator::eIncludeAll);
for (; !aState.mIter.AtEnd(); aState.mIter.Next()) {
nsIFrame* child = *aState.mIter;
const GridItemInfo* info = nullptr;
if (child->GetType() != nsGkAtoms::placeholderFrame) {
info = &aState.mGridItems[aState.mIter.GridItemIndex()];
}
ReflowInFlowChild(*aState.mIter, info, containerSize, Nothing(), nullptr,
aState, aContentArea, aDesiredSize, aStatus);
MOZ_ASSERT(NS_FRAME_IS_COMPLETE(aStatus), "child should be complete "
"in unconstrained reflow");
}
}
// Merge overflow container bounds and status.
aDesiredSize.mOverflowAreas.UnionWith(ocBounds);
NS_MergeReflowStatusInto(&aStatus, ocStatus);
if (IsAbsoluteContainer()) {
nsFrameList children(GetChildList(GetAbsoluteListID()));
if (!children.IsEmpty()) {
// 'gridOrigin' is the origin of the grid (the start of the first track),
// with respect to the grid container's padding-box (CB).
LogicalMargin pad(aState.mReflowInput->ComputedLogicalPadding());
const LogicalPoint gridOrigin(wm, pad.IStart(wm), pad.BStart(wm));
const LogicalRect gridCB(wm, 0, 0,
aContentArea.ISize(wm) + pad.IStartEnd(wm),
bSize + pad.BStartEnd(wm));
const nsSize gridCBPhysicalSize = gridCB.Size(wm).GetPhysicalSize(wm);
size_t i = 0;
for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next(), ++i) {
nsIFrame* child = e.get();
MOZ_ASSERT(i < aState.mAbsPosItems.Length());
MOZ_ASSERT(aState.mAbsPosItems[i].mFrame == child);
GridArea& area = aState.mAbsPosItems[i].mArea;
LogicalRect itemCB =
aState.ContainingBlockForAbsPos(area, gridOrigin, gridCB);
// nsAbsoluteContainingBlock::Reflow uses physical coordinates.
nsRect* cb = child->Properties().Get(GridItemContainingBlockRect());
if (!cb) {
cb = new nsRect;
child->Properties().Set(GridItemContainingBlockRect(), cb);
}
*cb = itemCB.GetPhysicalRect(wm, gridCBPhysicalSize);
}
// We pass a dummy rect as CB because each child has its own CB rect.
// The eIsGridContainerCB flag tells nsAbsoluteContainingBlock::Reflow to
// use those instead.
nsRect dummyRect;
AbsPosReflowFlags flags =
AbsPosReflowFlags::eCBWidthAndHeightChanged; // XXX could be optimized
flags |= AbsPosReflowFlags::eConstrainHeight;
flags |= AbsPosReflowFlags::eIsGridContainerCB;
GetAbsoluteContainingBlock()->Reflow(this, PresContext(),
*aState.mReflowInput,
aStatus, dummyRect, flags,
&aDesiredSize.mOverflowAreas);
}
}
return bSize;
}
void
nsGridContainerFrame::Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus)
{
MarkInReflow();
DO_GLOBAL_REFLOW_COUNT("nsGridContainerFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus);
if (IsFrameTreeTooDeep(aReflowInput, aDesiredSize, aStatus)) {
return;
}
// First we gather child frames we should include in our reflow,
// i.e. overflowed children from our prev-in-flow, and pushed first-in-flow
// children (that might now fit). It's important to note that these children
// can be in arbitrary order vis-a-vis the current children in our lists.
// E.g. grid items in the document order: A, B, C may be placed in the rows
// 3, 2, 1. Assume each row goes in a separate grid container fragment,
// and we reflow the second fragment. Now if C (in fragment 1) overflows,
// we can't just prepend it to our mFrames like we usually do because that
// would violate the document order invariant that other code depends on.
// Similarly if we pull up child A (from fragment 3) we can't just append
// that for the same reason. Instead, we must sort these children into
// our child lists. (The sorting is trivial given that both lists are
// already fully sorted individually - it's just a merge.)
//
// The invariants that we maintain are that each grid container child list
// is sorted in the normal document order at all times, but that children
// in different grid container continuations may be in arbitrary order.
auto prevInFlow = static_cast<nsGridContainerFrame*>(GetPrevInFlow());
// Merge overflow frames from our prev-in-flow into our principal child list.
if (prevInFlow) {
AutoFrameListPtr overflow(aPresContext,
prevInFlow->StealOverflowFrames());
if (overflow) {
ReparentFrames(*overflow, prevInFlow, this);
::MergeSortedFrameLists(mFrames, *overflow, GetContent());
// Move trailing next-in-flows into our overflow list.
nsFrameList continuations;
for (nsIFrame* f = mFrames.FirstChild(); f; ) {
nsIFrame* next = f->GetNextSibling();
nsIFrame* pif = f->GetPrevInFlow();
if (pif && pif->GetParent() == this) {
mFrames.RemoveFrame(f);
continuations.AppendFrame(nullptr, f);
}
f = next;
}
MergeSortedOverflow(continuations);
// Move trailing OC next-in-flows into our excess overflow containers list.
nsFrameList* overflowContainers =
GetPropTableFrames(OverflowContainersProperty());
if (overflowContainers) {
nsFrameList moveToEOC;
for (nsIFrame* f = overflowContainers->FirstChild(); f; ) {
nsIFrame* next = f->GetNextSibling();
nsIFrame* pif = f->GetPrevInFlow();
if (pif && pif->GetParent() == this) {
overflowContainers->RemoveFrame(f);
moveToEOC.AppendFrame(nullptr, f);
}
f = next;
}
if (overflowContainers->IsEmpty()) {
Properties().Delete(OverflowContainersProperty());
}
MergeSortedExcessOverflowContainers(moveToEOC);
}
}
}
// Merge our own overflow frames into our principal child list,
// except those that are a next-in-flow for one of our items.
DebugOnly<bool> foundOwnPushedChild = false;
{
nsFrameList* ourOverflow = GetOverflowFrames();
if (ourOverflow) {
nsFrameList items;
for (nsIFrame* f = ourOverflow->FirstChild(); f; ) {
nsIFrame* next = f->GetNextSibling();
nsIFrame* pif = f->GetPrevInFlow();
if (!pif || pif->GetParent() != this) {
MOZ_ASSERT(f->GetParent() == this);
ourOverflow->RemoveFrame(f);
items.AppendFrame(nullptr, f);
if (!pif) {
foundOwnPushedChild = true;
}
}
f = next;
}
::MergeSortedFrameLists(mFrames, items, GetContent());
if (ourOverflow->IsEmpty()) {
DestroyOverflowList();
}
}
}
// Pull up any first-in-flow children we might have pushed.
if (HasAnyStateBits(NS_STATE_GRID_DID_PUSH_ITEMS)) {
RemoveStateBits(NS_STATE_GRID_DID_PUSH_ITEMS);
nsFrameList items;
auto nif = static_cast<nsGridContainerFrame*>(GetNextInFlow());
auto firstNIF = nif;
DebugOnly<bool> nifNeedPushedItem = false;
while (nif) {
nsFrameList nifItems;
for (nsIFrame* nifChild = nif->GetChildList(kPrincipalList).FirstChild();
nifChild; ) {
nsIFrame* next = nifChild->GetNextSibling();
if (!nifChild->GetPrevInFlow()) {
nif->StealFrame(nifChild);
ReparentFrame(nifChild, nif, this);
nifItems.AppendFrame(nullptr, nifChild);
nifNeedPushedItem = false;
}
nifChild = next;
}
::MergeSortedFrameLists(items, nifItems, GetContent());
if (!nif->HasAnyStateBits(NS_STATE_GRID_DID_PUSH_ITEMS)) {
MOZ_ASSERT(!nifNeedPushedItem || mDidPushItemsBitMayLie,
"NS_STATE_GRID_DID_PUSH_ITEMS lied");
break;
}
nifNeedPushedItem = true;
for (nsIFrame* nifChild = nif->GetChildList(kOverflowList).FirstChild();
nifChild; ) {
nsIFrame* next = nifChild->GetNextSibling();
if (!nifChild->GetPrevInFlow()) {
nif->StealFrame(nifChild);
ReparentFrame(nifChild, nif, this);
nifItems.AppendFrame(nullptr, nifChild);
nifNeedPushedItem = false;
}
nifChild = next;
}
::MergeSortedFrameLists(items, nifItems, GetContent());
nif->RemoveStateBits(NS_STATE_GRID_DID_PUSH_ITEMS);
nif = static_cast<nsGridContainerFrame*>(nif->GetNextInFlow());
MOZ_ASSERT(nif || !nifNeedPushedItem || mDidPushItemsBitMayLie,
"NS_STATE_GRID_DID_PUSH_ITEMS lied");
}
if (!items.IsEmpty()) {
// Pull up the first next-in-flow of the pulled up items too, unless its
// parent is our nif (to avoid leaving a hole there).
nsFrameList childNIFs;
nsFrameList childOCNIFs;
for (auto child : items) {
auto childNIF = child->GetNextInFlow();
if (childNIF && childNIF->GetParent() != firstNIF) {
auto parent = childNIF->GetParent();
parent->StealFrame(childNIF);
ReparentFrame(childNIF, parent, firstNIF);
if ((childNIF->GetStateBits() & NS_FRAME_IS_OVERFLOW_CONTAINER)) {
childOCNIFs.AppendFrame(nullptr, childNIF);
} else {
childNIFs.AppendFrame(nullptr, childNIF);
}
}
}
// Merge items' NIFs into our NIF's respective overflow child lists.
firstNIF->MergeSortedOverflow(childNIFs);
firstNIF->MergeSortedExcessOverflowContainers(childOCNIFs);
}
MOZ_ASSERT(foundOwnPushedChild || !items.IsEmpty() || mDidPushItemsBitMayLie,
"NS_STATE_GRID_DID_PUSH_ITEMS lied");
::MergeSortedFrameLists(mFrames, items, GetContent());
}
RenumberList();
#ifdef DEBUG
mDidPushItemsBitMayLie = false;
SanityCheckGridItemsBeforeReflow();
#endif // DEBUG
const nsStylePosition* stylePos = aReflowInput.mStylePosition;
if (!prevInFlow) {
InitImplicitNamedAreas(stylePos);
}
GridReflowInput gridReflowInput(this, aReflowInput);
if (gridReflowInput.mIter.ItemsAreAlreadyInOrder()) {
AddStateBits(NS_STATE_GRID_NORMAL_FLOW_CHILDREN_IN_CSS_ORDER);
} else {
RemoveStateBits(NS_STATE_GRID_NORMAL_FLOW_CHILDREN_IN_CSS_ORDER);
}
const nscoord computedBSize = aReflowInput.ComputedBSize();
const nscoord computedISize = aReflowInput.ComputedISize();
const WritingMode& wm = gridReflowInput.mWM;
LogicalSize computedSize(wm, computedISize, computedBSize);
nscoord consumedBSize = 0;
if (!prevInFlow) {
// ComputedMinSize is zero rather than NS_UNCONSTRAINEDSIZE when indefinite
// (unfortunately) so we have to check the style data and parent reflow state
// to determine if it's indefinite.
LogicalSize computedMinSize(aReflowInput.ComputedMinSize());
const ReflowInput* cbState = aReflowInput.mCBReflowInput;
if (!stylePos->MinISize(wm).IsCoordPercentCalcUnit() ||
(stylePos->MinISize(wm).HasPercent() && cbState &&
cbState->ComputedSize(wm).ISize(wm) == NS_UNCONSTRAINEDSIZE)) {
computedMinSize.ISize(wm) = NS_UNCONSTRAINEDSIZE;
}
if (!stylePos->MinBSize(wm).IsCoordPercentCalcUnit() ||
(stylePos->MinBSize(wm).HasPercent() && cbState &&
cbState->ComputedSize(wm).BSize(wm) == NS_UNCONSTRAINEDSIZE)) {
computedMinSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
}
Grid grid;
grid.PlaceGridItems(gridReflowInput, computedMinSize, computedSize,
aReflowInput.ComputedMaxSize());
gridReflowInput.CalculateTrackSizes(grid, computedSize,
nsLayoutUtils::PREF_ISIZE);
} else {
consumedBSize = GetConsumedBSize();
gridReflowInput.InitializeForContinuation(this, consumedBSize);
}
nscoord bSize = 0;
if (computedBSize == NS_AUTOHEIGHT) {
const uint32_t numRows = gridReflowInput.mRows.mSizes.Length();
if (!prevInFlow) {
// Note: we can't use GridLineEdge here since we haven't calculated
// the rows' mPosition yet (happens in AlignJustifyContent below).
for (uint32_t i = 0; i < numRows; ++i) {
bSize += gridReflowInput.mRows.mSizes[i].mBase;
}
bSize += gridReflowInput.mRows.SumOfGridGaps();
} else {
bSize = gridReflowInput.mRows.GridLineEdge(numRows,
GridLineSide::eAfterGridGap);
}
bSize = NS_CSS_MINMAX(bSize,
aReflowInput.ComputedMinBSize(),
aReflowInput.ComputedMaxBSize());
} else {
bSize = computedBSize;
}
bSize = std::max(bSize - consumedBSize, 0);
auto& bp = gridReflowInput.mBorderPadding;
LogicalRect contentArea(wm, bp.IStart(wm), bp.BStart(wm),
computedISize, bSize);
if (!prevInFlow) {
// Apply 'align/justify-content' to the grid.
// CalculateTrackSizes did the columns.
gridReflowInput.mRows.AlignJustifyContent(stylePos, wm, contentArea.Size(wm));
}
bSize = ReflowChildren(gridReflowInput, contentArea, aDesiredSize, aStatus);
bSize = std::max(bSize - consumedBSize, 0);
// Skip our block-end border if we're INCOMPLETE.
if (!NS_FRAME_IS_COMPLETE(aStatus) &&
!gridReflowInput.mSkipSides.BEnd() &&
StyleBorder()->mBoxDecorationBreak !=
StyleBoxDecorationBreak::Clone) {
bp.BEnd(wm) = nscoord(0);
}
LogicalSize desiredSize(wm, computedISize + bp.IStartEnd(wm),
bSize + bp.BStartEnd(wm));
aDesiredSize.SetSize(wm, desiredSize);
aDesiredSize.mOverflowAreas.UnionAllWith(nsRect(0, 0,
aDesiredSize.Width(),
aDesiredSize.Height()));
// Convert INCOMPLETE -> OVERFLOW_INCOMPLETE and zero bsize if we're an OC.
if (HasAnyStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER)) {
if (!NS_FRAME_IS_COMPLETE(aStatus)) {
NS_FRAME_SET_OVERFLOW_INCOMPLETE(aStatus);
aStatus |= NS_FRAME_REFLOW_NEXTINFLOW;
}
bSize = 0;
desiredSize.BSize(wm) = bSize + bp.BStartEnd(wm);
aDesiredSize.SetSize(wm, desiredSize);
}
if (HasAnyStateBits(NS_STATE_GRID_GENERATE_COMPUTED_VALUES)) {
// This state bit will never be cleared, since reflow can be called
// multiple times in fragmented grids, and it's challenging to scope
// the bit to only that sequence of calls. This is relatively harmless
// since this bit is only set by accessing a ChromeOnly property, and
// therefore can't unduly slow down normal web browsing.
// Now that we know column and row sizes and positions, set
// the ComputedGridTrackInfo and related properties
uint32_t colTrackCount = gridReflowInput.mCols.mSizes.Length();
nsTArray<nscoord> colTrackPositions(colTrackCount);
nsTArray<nscoord> colTrackSizes(colTrackCount);
nsTArray<uint32_t> colTrackStates(colTrackCount);
uint32_t col = 0;
for (const TrackSize& sz : gridReflowInput.mCols.mSizes) {
colTrackPositions.AppendElement(sz.mPosition);
colTrackSizes.AppendElement(sz.mBase);
bool isRepeat = ((col >= gridReflowInput.mColFunctions.mRepeatAutoStart) &&
(col < gridReflowInput.mColFunctions.mRepeatAutoEnd));
colTrackStates.AppendElement(
isRepeat ?
(uint32_t)mozilla::dom::GridTrackState::Repeat :
(uint32_t)mozilla::dom::GridTrackState::Static
);
col++;
}
ComputedGridTrackInfo* colInfo = new ComputedGridTrackInfo(
gridReflowInput.mColFunctions.mExplicitGridOffset,
gridReflowInput.mColFunctions.NumExplicitTracks(),
0,
col,
Move(colTrackPositions),
Move(colTrackSizes),
Move(colTrackStates));
Properties().Set(GridColTrackInfo(), colInfo);
uint32_t rowTrackCount = gridReflowInput.mRows.mSizes.Length();
nsTArray<nscoord> rowTrackPositions(rowTrackCount);
nsTArray<nscoord> rowTrackSizes(rowTrackCount);
nsTArray<uint32_t> rowTrackStates(rowTrackCount);
uint32_t row = 0;
for (const TrackSize& sz : gridReflowInput.mRows.mSizes) {
rowTrackPositions.AppendElement(sz.mPosition);
rowTrackSizes.AppendElement(sz.mBase);
bool isRepeat = ((row >= gridReflowInput.mRowFunctions.mRepeatAutoStart) &&
(row < gridReflowInput.mRowFunctions.mRepeatAutoEnd));
rowTrackStates.AppendElement(
isRepeat ?
(uint32_t)mozilla::dom::GridTrackState::Repeat :
(uint32_t)mozilla::dom::GridTrackState::Static
);
row++;
}
// Row info has to accomodate fragmentation of the grid, which may happen in
// later calls to Reflow. For now, presume that no more fragmentation will
// occur.
ComputedGridTrackInfo* rowInfo = new ComputedGridTrackInfo(
gridReflowInput.mRowFunctions.mExplicitGridOffset,
gridReflowInput.mRowFunctions.NumExplicitTracks(),
gridReflowInput.mStartRow,
row,
Move(rowTrackPositions),
Move(rowTrackSizes),
Move(rowTrackStates));
Properties().Set(GridRowTrackInfo(), rowInfo);
if (prevInFlow) {
// This frame is fragmenting rows from a previous frame, so patch up
// the prior GridRowTrackInfo with a new end row.
// FIXME: This can be streamlined and/or removed when bug 1151204 lands.
ComputedGridTrackInfo* priorRowInfo =
prevInFlow->Properties().Get(GridRowTrackInfo());
// Adjust track positions based on the first track in this fragment.
if (priorRowInfo->mPositions.Length() >
priorRowInfo->mStartFragmentTrack) {
nscoord delta =
priorRowInfo->mPositions[priorRowInfo->mStartFragmentTrack];
for (nscoord& pos : priorRowInfo->mPositions) {
pos -= delta;
}
}
ComputedGridTrackInfo* revisedPriorRowInfo = new ComputedGridTrackInfo(
priorRowInfo->mNumLeadingImplicitTracks,
priorRowInfo->mNumExplicitTracks,
priorRowInfo->mStartFragmentTrack,
gridReflowInput.mStartRow,
Move(priorRowInfo->mPositions),
Move(priorRowInfo->mSizes),
Move(priorRowInfo->mStates));
prevInFlow->Properties().Set(GridRowTrackInfo(), revisedPriorRowInfo);
}
// Generate the line info properties. We need to provide the number of
// repeat tracks produced in the reflow.
// Generate column lines first.
uint32_t capacity = gridReflowInput.mColFunctions.NumRepeatTracks() +
gridReflowInput.mCols.mSizes.Length();
nsTArray<nsTArray<nsString>> columnLineNames(capacity);
for (col = 0; col <= gridReflowInput.mCols.mSizes.Length(); col++) {
columnLineNames.AppendElement(
gridReflowInput.mCols.GetLineNamesAtIndex(
gridReflowInput.mGridStyle->mGridTemplateColumns,
gridReflowInput.mColFunctions,
col));
}
ComputedGridLineInfo* columnLineInfo = new ComputedGridLineInfo(
Move(columnLineNames));
Properties().Set(GridColumnLineInfo(), columnLineInfo);
// Generate row lines next.
capacity = gridReflowInput.mRowFunctions.NumRepeatTracks() +
gridReflowInput.mRows.mSizes.Length();
nsTArray<nsTArray<nsString>> rowLineNames(capacity);
for (row = 0; row <= gridReflowInput.mRows.mSizes.Length(); row++) {
rowLineNames.AppendElement(
gridReflowInput.mRows.GetLineNamesAtIndex(
gridReflowInput.mGridStyle->mGridTemplateRows,
gridReflowInput.mRowFunctions,
row));
}
ComputedGridLineInfo* rowLineInfo = new ComputedGridLineInfo(
Move(rowLineNames));
Properties().Set(GridRowLineInfo(), rowLineInfo);
// Generate area info for explicit areas. Implicit areas are handled
// elsewhere.
if (gridReflowInput.mGridStyle->mGridTemplateAreas) {
nsTArray<css::GridNamedArea>* areas = new nsTArray<css::GridNamedArea>(
gridReflowInput.mGridStyle->mGridTemplateAreas->mNamedAreas);
Properties().Set(ExplicitNamedAreasProperty(), areas);
} else {
Properties().Delete(ExplicitNamedAreasProperty());
}
}
if (!prevInFlow) {
SharedGridData* sharedGridData = Properties().Get(SharedGridData::Prop());
if (!NS_FRAME_IS_FULLY_COMPLETE(aStatus)) {
if (!sharedGridData) {
sharedGridData = new SharedGridData;
Properties().Set(SharedGridData::Prop(), sharedGridData);
}
sharedGridData->mCols.mSizes.Clear();
sharedGridData->mCols.mSizes.SwapElements(gridReflowInput.mCols.mSizes);
sharedGridData->mCols.mContentBoxSize = gridReflowInput.mCols.mContentBoxSize;
sharedGridData->mCols.mBaselineSubtreeAlign[0] =
gridReflowInput.mCols.mBaselineSubtreeAlign[0];
sharedGridData->mCols.mBaselineSubtreeAlign[1] =
gridReflowInput.mCols.mBaselineSubtreeAlign[1];
sharedGridData->mRows.mSizes.Clear();
sharedGridData->mRows.mSizes.SwapElements(gridReflowInput.mRows.mSizes);
// Save the original row grid sizes and gaps so we can restore them later
// in GridReflowInput::Initialize for the continuations.
auto& origRowData = sharedGridData->mOriginalRowData;
origRowData.ClearAndRetainStorage();
origRowData.SetCapacity(sharedGridData->mRows.mSizes.Length());
nscoord prevTrackEnd = 0;
for (auto& sz : sharedGridData->mRows.mSizes) {
SharedGridData::RowData data = {sz.mBase, sz.mPosition - prevTrackEnd};
origRowData.AppendElement(data);
prevTrackEnd = sz.mPosition + sz.mBase;
}
sharedGridData->mRows.mContentBoxSize = gridReflowInput.mRows.mContentBoxSize;
sharedGridData->mRows.mBaselineSubtreeAlign[0] =
gridReflowInput.mRows.mBaselineSubtreeAlign[0];
sharedGridData->mRows.mBaselineSubtreeAlign[1] =
gridReflowInput.mRows.mBaselineSubtreeAlign[1];
sharedGridData->mGridItems.Clear();
sharedGridData->mGridItems.SwapElements(gridReflowInput.mGridItems);
sharedGridData->mAbsPosItems.Clear();
sharedGridData->mAbsPosItems.SwapElements(gridReflowInput.mAbsPosItems);
sharedGridData->mGenerateComputedGridInfo =
HasAnyStateBits(NS_STATE_GRID_GENERATE_COMPUTED_VALUES);
} else if (sharedGridData && !GetNextInFlow()) {
Properties().Delete(SharedGridData::Prop());
}
}
FinishAndStoreOverflow(&aDesiredSize);
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}
nscoord
nsGridContainerFrame::IntrinsicISize(nsRenderingContext* aRenderingContext,
IntrinsicISizeType aConstraint)
{
RenumberList();
// Calculate the sum of column sizes under aConstraint.
// http://dev.w3.org/csswg/css-grid/#intrinsic-sizes
GridReflowInput state(this, *aRenderingContext);
InitImplicitNamedAreas(state.mGridStyle); // XXX optimize
LogicalSize indefinite(state.mWM, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE);
Grid grid;
grid.PlaceGridItems(state, indefinite, indefinite, indefinite); // XXX optimize
if (grid.mGridColEnd == 0) {
return 0;
}
state.mCols.Initialize(state.mColFunctions, state.mGridStyle->mGridColumnGap,
grid.mGridColEnd, NS_UNCONSTRAINEDSIZE);
state.mCols.CalculateSizes(state, state.mGridItems, state.mColFunctions,
NS_UNCONSTRAINEDSIZE, &GridArea::mCols,
aConstraint);
nscoord length = 0;
for (const TrackSize& sz : state.mCols.mSizes) {
length += sz.mBase;
}
return length + state.mCols.SumOfGridGaps();
}
nscoord
nsGridContainerFrame::GetMinISize(nsRenderingContext* aRC)
{
DISPLAY_MIN_WIDTH(this, mCachedMinISize);
if (mCachedMinISize == NS_INTRINSIC_WIDTH_UNKNOWN) {
mCachedMinISize = IntrinsicISize(aRC, nsLayoutUtils::MIN_ISIZE);
}
return mCachedMinISize;
}
nscoord
nsGridContainerFrame::GetPrefISize(nsRenderingContext* aRC)
{
DISPLAY_PREF_WIDTH(this, mCachedPrefISize);
if (mCachedPrefISize == NS_INTRINSIC_WIDTH_UNKNOWN) {
mCachedPrefISize = IntrinsicISize(aRC, nsLayoutUtils::PREF_ISIZE);
}
return mCachedPrefISize;
}
void
nsGridContainerFrame::MarkIntrinsicISizesDirty()
{
mCachedMinISize = NS_INTRINSIC_WIDTH_UNKNOWN;
mCachedPrefISize = NS_INTRINSIC_WIDTH_UNKNOWN;
nsContainerFrame::MarkIntrinsicISizesDirty();
}
nsIAtom*
nsGridContainerFrame::GetType() const
{
return nsGkAtoms::gridContainerFrame;
}
void
nsGridContainerFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists)
{
DisplayBorderBackgroundOutline(aBuilder, aLists);
if (GetPrevInFlow()) {
DisplayOverflowContainers(aBuilder, aDirtyRect, aLists);
}
// Our children are all grid-level boxes, which behave the same as
// inline-blocks in painting, so their borders/backgrounds all go on
// the BlockBorderBackgrounds list.
typedef GridItemCSSOrderIterator::OrderState OrderState;
OrderState order = HasAnyStateBits(NS_STATE_GRID_NORMAL_FLOW_CHILDREN_IN_CSS_ORDER)
? OrderState::eKnownOrdered
: OrderState::eKnownUnordered;
GridItemCSSOrderIterator iter(this, kPrincipalList,
GridItemCSSOrderIterator::eIncludeAll, order);
for (; !iter.AtEnd(); iter.Next()) {
nsIFrame* child = *iter;
BuildDisplayListForChild(aBuilder, child, aDirtyRect, aLists,
::GetDisplayFlagsForGridItem(child));
}
}
bool
nsGridContainerFrame::DrainSelfOverflowList()
{
// Unlike nsContainerFrame::DrainSelfOverflowList we need to merge these lists
// so that the resulting mFrames is in document content order.
// NOTE: nsContainerFrame::AppendFrames/InsertFrames calls this method.
AutoFrameListPtr overflowFrames(PresContext(), StealOverflowFrames());
if (overflowFrames) {
::MergeSortedFrameLists(mFrames, *overflowFrames, GetContent());
return true;
}
return false;
}
void
nsGridContainerFrame::AppendFrames(ChildListID aListID, nsFrameList& aFrameList)
{
NoteNewChildren(aListID, aFrameList);
nsContainerFrame::AppendFrames(aListID, aFrameList);
}
void
nsGridContainerFrame::InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
nsFrameList& aFrameList)
{
NoteNewChildren(aListID, aFrameList);
nsContainerFrame::InsertFrames(aListID, aPrevFrame, aFrameList);
}
void
nsGridContainerFrame::RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame)
{
#ifdef DEBUG
ChildListIDs supportedLists =
kAbsoluteList | kFixedList | kPrincipalList | kNoReflowPrincipalList;
MOZ_ASSERT(supportedLists.Contains(aListID), "unexpected child list");
// Note that kPrincipalList doesn't mean aOldFrame must be on that list.
// It can also be on kOverflowList, in which case it might be a pushed
// item, and if it's the only pushed item our DID_PUSH_ITEMS bit will lie.
mDidPushItemsBitMayLie = mDidPushItemsBitMayLie ||
(aListID == kPrincipalList &&
!aOldFrame->GetPrevInFlow());
#endif
nsContainerFrame::RemoveFrame(aListID, aOldFrame);
}
#ifdef DEBUG_FRAME_DUMP
nsresult
nsGridContainerFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("GridContainer"), aResult);
}
#endif
void
nsGridContainerFrame::NoteNewChildren(ChildListID aListID,
const nsFrameList& aFrameList)
{
#ifdef DEBUG
ChildListIDs supportedLists =
kAbsoluteList | kFixedList | kPrincipalList | kNoReflowPrincipalList;
MOZ_ASSERT(supportedLists.Contains(aListID), "unexpected child list");
#endif
nsIPresShell* shell = PresContext()->PresShell();
for (auto pif = GetPrevInFlow(); pif; pif = pif->GetPrevInFlow()) {
if (aListID == kPrincipalList) {
pif->AddStateBits(NS_STATE_GRID_DID_PUSH_ITEMS);
}
shell->FrameNeedsReflow(pif, nsIPresShell::eTreeChange, NS_FRAME_IS_DIRTY);
}
}
void
nsGridContainerFrame::MergeSortedOverflow(nsFrameList& aList)
{
if (aList.IsEmpty()) {
return;
}
MOZ_ASSERT(!aList.FirstChild()->HasAnyStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER),
"this is the wrong list to put this child frame");
MOZ_ASSERT(aList.FirstChild()->GetParent() == this);
nsFrameList* overflow = GetOverflowFrames();
if (overflow) {
::MergeSortedFrameLists(*overflow, aList, GetContent());
} else {
SetOverflowFrames(aList);
}
}
void
nsGridContainerFrame::MergeSortedExcessOverflowContainers(nsFrameList& aList)
{
if (aList.IsEmpty()) {
return;
}
MOZ_ASSERT(aList.FirstChild()->HasAnyStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER),
"this is the wrong list to put this child frame");
MOZ_ASSERT(aList.FirstChild()->GetParent() == this);
nsFrameList* eoc = GetPropTableFrames(ExcessOverflowContainersProperty());
if (eoc) {
::MergeSortedFrameLists(*eoc, aList, GetContent());
} else {
SetPropTableFrames(new (PresContext()->PresShell()) nsFrameList(aList),
ExcessOverflowContainersProperty());
}
}
#ifdef DEBUG
void
nsGridContainerFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList)
{
ChildListIDs supportedLists = kAbsoluteList | kFixedList | kPrincipalList;
MOZ_ASSERT(supportedLists.Contains(aListID), "unexpected child list");
return nsContainerFrame::SetInitialChildList(aListID, aChildList);
}
void
nsGridContainerFrame::SanityCheckGridItemsBeforeReflow() const
{
ChildListIDs absLists = kAbsoluteList | kFixedList |
kOverflowContainersList | kExcessOverflowContainersList;
ChildListIDs itemLists = kPrincipalList | kOverflowList;
for (const nsIFrame* f = this; f; f = f->GetNextInFlow()) {
MOZ_ASSERT(!f->HasAnyStateBits(NS_STATE_GRID_DID_PUSH_ITEMS),
"At start of reflow, we should've pulled items back from all "
"NIFs and cleared NS_STATE_GRID_DID_PUSH_ITEMS in the process");
for (nsIFrame::ChildListIterator childLists(f);
!childLists.IsDone(); childLists.Next()) {
if (!itemLists.Contains(childLists.CurrentID())) {
MOZ_ASSERT(absLists.Contains(childLists.CurrentID()),
"unexpected non-empty child list");
continue;
}
for (auto child : childLists.CurrentList()) {
MOZ_ASSERT(f == this || child->GetPrevInFlow(),
"all pushed items must be pulled up before reflow");
}
}
}
// If we have a prev-in-flow, each of its children's next-in-flow
// should be one of our children or be null.
const auto pif = static_cast<nsGridContainerFrame*>(GetPrevInFlow());
if (pif) {
const nsFrameList* oc =
GetPropTableFrames(OverflowContainersProperty());
const nsFrameList* eoc =
GetPropTableFrames(ExcessOverflowContainersProperty());
const nsFrameList* pifEOC =
pif->GetPropTableFrames(ExcessOverflowContainersProperty());
for (const nsIFrame* child : pif->GetChildList(kPrincipalList)) {
const nsIFrame* childNIF = child->GetNextInFlow();
MOZ_ASSERT(!childNIF || mFrames.ContainsFrame(childNIF) ||
(pifEOC && pifEOC->ContainsFrame(childNIF)) ||
(oc && oc->ContainsFrame(childNIF)) ||
(eoc && eoc->ContainsFrame(childNIF)));
}
}
}
void
nsGridContainerFrame::TrackSize::Dump() const
{
printf("mPosition=%d mBase=%d mLimit=%d", mPosition, mBase, mLimit);
printf(" min:");
if (mState & eAutoMinSizing) {
printf("auto ");
} else if (mState & eMinContentMinSizing) {
printf("min-content ");
} else if (mState & eMaxContentMinSizing) {
printf("max-content ");
} else if (mState & eFlexMinSizing) {
printf("flex ");
}
printf(" max:");
if (mState & eAutoMaxSizing) {
printf("auto ");
} else if (mState & eMinContentMaxSizing) {
printf("min-content ");
} else if (mState & eMaxContentMaxSizing) {
printf("max-content ");
} else if (mState & eFlexMaxSizing) {
printf("flex ");
}
if (mState & eFrozen) {
printf("frozen ");
}
if (mState & eBreakBefore) {
printf("break-before ");
}
}
#endif // DEBUG
nsGridContainerFrame*
nsGridContainerFrame::GetGridFrameWithComputedInfo(nsIFrame* aFrame)
{
// Prepare a lambda function that we may need to call multiple times.
auto GetGridContainerFrame = [](nsIFrame *aFrame) {
// Return the aFrame's content insertion frame, iff it is
// a grid container.
nsGridContainerFrame* gridFrame = nullptr;
if (aFrame) {
nsIFrame* contentFrame = aFrame->GetContentInsertionFrame();
if (contentFrame &&
(contentFrame->GetType() == nsGkAtoms::gridContainerFrame)) {
gridFrame = static_cast<nsGridContainerFrame*>(contentFrame);
}
}
return gridFrame;
};
nsGridContainerFrame* gridFrame = GetGridContainerFrame(aFrame);
if (gridFrame) {
// if any of our properties are missing, generate them
bool reflowNeeded = (!gridFrame->Properties().Has(GridColTrackInfo()) ||
!gridFrame->Properties().Has(GridRowTrackInfo()) ||
!gridFrame->Properties().Has(GridColumnLineInfo()) ||
!gridFrame->Properties().Has(GridRowLineInfo()));
if (reflowNeeded) {
// Trigger a reflow that generates additional grid property data.
nsIPresShell* shell = gridFrame->PresContext()->PresShell();
gridFrame->AddStateBits(NS_STATE_GRID_GENERATE_COMPUTED_VALUES);
shell->FrameNeedsReflow(gridFrame,
nsIPresShell::eResize,
NS_FRAME_IS_DIRTY);
shell->FlushPendingNotifications(Flush_Layout);
// Since the reflow may have side effects, get the grid frame again.
gridFrame = GetGridContainerFrame(aFrame);
// Assert the grid properties are present
MOZ_ASSERT(!gridFrame ||
gridFrame->Properties().Has(GridColTrackInfo()));
MOZ_ASSERT(!gridFrame ||
gridFrame->Properties().Has(GridRowTrackInfo()));
MOZ_ASSERT(!gridFrame ||
gridFrame->Properties().Has(GridColumnLineInfo()));
MOZ_ASSERT(!gridFrame ||
gridFrame->Properties().Has(GridRowLineInfo()));
}
}
return gridFrame;
}
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