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fune/layout/generic/ReflowInput.cpp
Emilio Cobos Álvarez eb823eb895 Bug 1814626 - Expose line-height resolution to style, and use it from ToResolvedValue. r=jfkthame 
For ToResolvedValue implementation purposes we wouldn't need to split
out the vertical / font / line-height arguments and we could just pass
around the ComputedStyle, but the lh unit would need that distinction,
(because computing lh on font properties should use the parent style).

Differential Revision: https://phabricator.services.mozilla.com/D168705
2023-02-14 22:36:31 +00:00

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* struct containing the input to nsIFrame::Reflow */
#include "mozilla/ReflowInput.h"
#include <algorithm>
#include "CounterStyleManager.h"
#include "LayoutLogging.h"
#include "mozilla/dom/HTMLInputElement.h"
#include "mozilla/SVGUtils.h"
#include "mozilla/WritingModes.h"
#include "nsBlockFrame.h"
#include "nsCSSAnonBoxes.h"
#include "nsFlexContainerFrame.h"
#include "nsFontInflationData.h"
#include "nsFontMetrics.h"
#include "nsGkAtoms.h"
#include "nsGridContainerFrame.h"
#include "nsIContent.h"
#include "nsIFrame.h"
#include "nsIFrameInlines.h"
#include "nsImageFrame.h"
#include "nsIPercentBSizeObserver.h"
#include "nsLayoutUtils.h"
#include "nsLineBox.h"
#include "nsPresContext.h"
#include "nsStyleConsts.h"
#include "nsTableCellFrame.h"
#include "nsTableFrame.h"
#include "StickyScrollContainer.h"
using namespace mozilla;
using namespace mozilla::css;
using namespace mozilla::dom;
using namespace mozilla::layout;
static bool CheckNextInFlowParenthood(nsIFrame* aFrame, nsIFrame* aParent) {
nsIFrame* frameNext = aFrame->GetNextInFlow();
nsIFrame* parentNext = aParent->GetNextInFlow();
return frameNext && parentNext && frameNext->GetParent() == parentNext;
}
/**
* Adjusts the margin for a list (ol, ul), if necessary, depending on
* font inflation settings. Unfortunately, because bullets from a list are
* placed in the margin area, we only have ~40px in which to place the
* bullets. When they are inflated, however, this causes problems, since
* the text takes up more space than is available in the margin.
*
* This method will return a small amount (in app units) by which the
* margin can be adjusted, so that the space is available for list
* bullets to be rendered with font inflation enabled.
*/
static nscoord FontSizeInflationListMarginAdjustment(const nsIFrame* aFrame) {
if (!aFrame->IsBlockFrameOrSubclass()) {
return 0;
}
// We only want to adjust the margins if we're dealing with an ordered list.
const nsBlockFrame* blockFrame = static_cast<const nsBlockFrame*>(aFrame);
if (!blockFrame->HasMarker()) {
return 0;
}
float inflation = nsLayoutUtils::FontSizeInflationFor(aFrame);
if (inflation <= 1.0f) {
return 0;
}
// The HTML spec states that the default padding for ordered lists
// begins at 40px, indicating that we have 40px of space to place a
// bullet. When performing font inflation calculations, we add space
// equivalent to this, but simply inflated at the same amount as the
// text, in app units.
auto margin = nsPresContext::CSSPixelsToAppUnits(40) * (inflation - 1);
auto* list = aFrame->StyleList();
if (!list->mCounterStyle.IsAtom()) {
return margin;
}
nsAtom* type = list->mCounterStyle.AsAtom();
if (type != nsGkAtoms::none && type != nsGkAtoms::disc &&
type != nsGkAtoms::circle && type != nsGkAtoms::square &&
type != nsGkAtoms::disclosure_closed &&
type != nsGkAtoms::disclosure_open) {
return margin;
}
return 0;
}
SizeComputationInput::SizeComputationInput(nsIFrame* aFrame,
gfxContext* aRenderingContext)
: mFrame(aFrame),
mRenderingContext(aRenderingContext),
mWritingMode(aFrame->GetWritingMode()),
mIsThemed(aFrame->IsThemed()),
mComputedMargin(mWritingMode),
mComputedBorderPadding(mWritingMode),
mComputedPadding(mWritingMode) {
MOZ_ASSERT(mFrame);
}
SizeComputationInput::SizeComputationInput(
nsIFrame* aFrame, gfxContext* aRenderingContext,
WritingMode aContainingBlockWritingMode, nscoord aContainingBlockISize,
const Maybe<LogicalMargin>& aBorder, const Maybe<LogicalMargin>& aPadding)
: SizeComputationInput(aFrame, aRenderingContext) {
MOZ_ASSERT(!mFrame->IsTableColFrame());
InitOffsets(aContainingBlockWritingMode, aContainingBlockISize,
mFrame->Type(), {}, aBorder, aPadding);
}
// Initialize a <b>root</b> reflow input with a rendering context to
// use for measuring things.
ReflowInput::ReflowInput(nsPresContext* aPresContext, nsIFrame* aFrame,
gfxContext* aRenderingContext,
const LogicalSize& aAvailableSpace, InitFlags aFlags)
: SizeComputationInput(aFrame, aRenderingContext),
mAvailableSize(aAvailableSpace) {
MOZ_ASSERT(aRenderingContext, "no rendering context");
MOZ_ASSERT(aPresContext, "no pres context");
MOZ_ASSERT(aFrame, "no frame");
MOZ_ASSERT(aPresContext == aFrame->PresContext(), "wrong pres context");
if (aFlags.contains(InitFlag::DummyParentReflowInput)) {
mFlags.mDummyParentReflowInput = true;
}
if (aFlags.contains(InitFlag::StaticPosIsCBOrigin)) {
mFlags.mStaticPosIsCBOrigin = true;
}
if (!aFlags.contains(InitFlag::CallerWillInit)) {
Init(aPresContext);
}
}
// Initialize a reflow input for a child frame's reflow. Some state
// is copied from the parent reflow input; the remaining state is
// computed.
ReflowInput::ReflowInput(nsPresContext* aPresContext,
const ReflowInput& aParentReflowInput,
nsIFrame* aFrame, const LogicalSize& aAvailableSpace,
const Maybe<LogicalSize>& aContainingBlockSize,
InitFlags aFlags,
const StyleSizeOverrides& aSizeOverrides,
ComputeSizeFlags aComputeSizeFlags)
: SizeComputationInput(aFrame, aParentReflowInput.mRenderingContext),
mParentReflowInput(&aParentReflowInput),
mFloatManager(aParentReflowInput.mFloatManager),
mLineLayout(mFrame->IsFrameOfType(nsIFrame::eLineParticipant)
? aParentReflowInput.mLineLayout
: nullptr),
mBreakType(aParentReflowInput.mBreakType),
mPercentBSizeObserver(
(aParentReflowInput.mPercentBSizeObserver &&
aParentReflowInput.mPercentBSizeObserver->NeedsToObserve(*this))
? aParentReflowInput.mPercentBSizeObserver
: nullptr),
mFlags(aParentReflowInput.mFlags),
mStyleSizeOverrides(aSizeOverrides),
mComputeSizeFlags(aComputeSizeFlags),
mReflowDepth(aParentReflowInput.mReflowDepth + 1),
mAvailableSize(aAvailableSpace) {
MOZ_ASSERT(aPresContext, "no pres context");
MOZ_ASSERT(aFrame, "no frame");
MOZ_ASSERT(aPresContext == aFrame->PresContext(), "wrong pres context");
MOZ_ASSERT(!mFlags.mSpecialBSizeReflow || !aFrame->IsSubtreeDirty(),
"frame should be clean when getting special bsize reflow");
if (mWritingMode.IsOrthogonalTo(aParentReflowInput.GetWritingMode())) {
// If we're setting up for an orthogonal flow, and the parent reflow input
// had a constrained ComputedBSize, we can use that as our AvailableISize
// in preference to leaving it unconstrained.
if (AvailableISize() == NS_UNCONSTRAINEDSIZE &&
aParentReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE) {
SetAvailableISize(aParentReflowInput.ComputedBSize());
}
}
// Note: mFlags was initialized as a copy of aParentReflowInput.mFlags up in
// this constructor's init list, so the only flags that we need to explicitly
// initialize here are those that may need a value other than our parent's.
mFlags.mNextInFlowUntouched =
aParentReflowInput.mFlags.mNextInFlowUntouched &&
CheckNextInFlowParenthood(aFrame, aParentReflowInput.mFrame);
mFlags.mAssumingHScrollbar = mFlags.mAssumingVScrollbar = false;
mFlags.mIsColumnBalancing = false;
mFlags.mColumnSetWrapperHasNoBSizeLeft = false;
mFlags.mTreatBSizeAsIndefinite = false;
mFlags.mDummyParentReflowInput = false;
mFlags.mStaticPosIsCBOrigin = aFlags.contains(InitFlag::StaticPosIsCBOrigin);
mFlags.mIOffsetsNeedCSSAlign = mFlags.mBOffsetsNeedCSSAlign = false;
if (aFlags.contains(InitFlag::DummyParentReflowInput) ||
(mParentReflowInput->mFlags.mDummyParentReflowInput &&
mFrame->IsTableFrame())) {
mFlags.mDummyParentReflowInput = true;
}
if (!aFlags.contains(InitFlag::CallerWillInit)) {
Init(aPresContext, aContainingBlockSize);
}
}
template <typename SizeOrMaxSize>
inline nscoord SizeComputationInput::ComputeISizeValue(
const WritingMode aWM, const LogicalSize& aContainingBlockSize,
const LogicalSize& aContentEdgeToBoxSizing, nscoord aBoxSizingToMarginEdge,
const SizeOrMaxSize& aSize) const {
return mFrame
->ComputeISizeValue(mRenderingContext, aWM, aContainingBlockSize,
aContentEdgeToBoxSizing, aBoxSizingToMarginEdge,
aSize)
.mISize;
}
template <typename SizeOrMaxSize>
nscoord SizeComputationInput::ComputeISizeValue(
const LogicalSize& aContainingBlockSize, StyleBoxSizing aBoxSizing,
const SizeOrMaxSize& aSize) const {
WritingMode wm = GetWritingMode();
const auto borderPadding = ComputedLogicalBorderPadding(wm);
LogicalSize inside = aBoxSizing == StyleBoxSizing::Border
? borderPadding.Size(wm)
: LogicalSize(wm);
nscoord outside =
borderPadding.IStartEnd(wm) + ComputedLogicalMargin(wm).IStartEnd(wm);
outside -= inside.ISize(wm);
return ComputeISizeValue(wm, aContainingBlockSize, inside, outside, aSize);
}
nscoord SizeComputationInput::ComputeBSizeValue(
nscoord aContainingBlockBSize, StyleBoxSizing aBoxSizing,
const LengthPercentage& aSize) const {
WritingMode wm = GetWritingMode();
nscoord inside = 0;
if (aBoxSizing == StyleBoxSizing::Border) {
inside = ComputedLogicalBorderPadding(wm).BStartEnd(wm);
}
return nsLayoutUtils::ComputeBSizeValue(aContainingBlockBSize, inside, aSize);
}
bool ReflowInput::ShouldReflowAllKids() const {
// Note that we could make a stronger optimization for IsBResize if
// we use it in a ShouldReflowChild test that replaces the current
// checks of NS_FRAME_IS_DIRTY | NS_FRAME_HAS_DIRTY_CHILDREN, if it
// were tested there along with NS_FRAME_CONTAINS_RELATIVE_BSIZE.
// This would need to be combined with a slight change in which
// frames NS_FRAME_CONTAINS_RELATIVE_BSIZE is marked on.
return mFrame->HasAnyStateBits(NS_FRAME_IS_DIRTY) || IsIResize() ||
(IsBResize() &&
mFrame->HasAnyStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE));
}
void ReflowInput::SetComputedISize(nscoord aComputedISize,
ResetResizeFlags aFlags) {
// It'd be nice to assert that |frame| is not in reflow, but this fails for
// two reasons:
//
// 1) Viewport frames reset the computed isize on a copy of their reflow
// input when reflowing fixed-pos kids. In that case we actually don't
// want to mess with the resize flags, because comparing the frame's rect
// to the munged computed width is pointless.
// 2) nsIFrame::BoxReflow creates a reflow input for its parent. This reflow
// input is not used to reflow the parent, but just as a parent for the
// frame's own reflow input. So given a nsBoxFrame inside some non-XUL
// (like a text control, for example), we'll end up creating a reflow
// input for the parent while the parent is reflowing.
NS_WARNING_ASSERTION(aComputedISize >= 0, "Invalid computed inline-size!");
if (ComputedISize() != aComputedISize) {
mComputedSize.ISize(mWritingMode) = std::max(0, aComputedISize);
if (aFlags == ResetResizeFlags::Yes) {
InitResizeFlags(mFrame->PresContext(), mFrame->Type());
}
}
}
void ReflowInput::SetComputedBSize(nscoord aComputedBSize,
ResetResizeFlags aFlags) {
// It'd be nice to assert that |frame| is not in reflow, but this fails
// for two reasons:
//
// 1) Viewport frames reset the computed block size on a copy of their reflow
// input when reflowing fixed-pos kids. In that case we actually don't want
// to mess with the resize flags, because comparing the frame's rect to the
// munged computed bsize is pointless.
// 2) nsIFrame::BoxReflow creates a reflow input for its parent. This reflow
// input is not used to reflow the parent, but just as a parent for the
// frame's own reflow input. So given a nsBoxFrame inside some non-XUL
// (like a text control, for example), we'll end up creating a reflow
// input for the parent while the parent is reflowing.
NS_WARNING_ASSERTION(aComputedBSize >= 0, "Invalid computed block-size!");
if (ComputedBSize() != aComputedBSize) {
mComputedSize.BSize(mWritingMode) = std::max(0, aComputedBSize);
InitResizeFlags(mFrame->PresContext(), mFrame->Type());
}
}
void ReflowInput::Init(nsPresContext* aPresContext,
const Maybe<LogicalSize>& aContainingBlockSize,
const Maybe<LogicalMargin>& aBorder,
const Maybe<LogicalMargin>& aPadding) {
if (AvailableISize() == NS_UNCONSTRAINEDSIZE) {
// Look up the parent chain for an orthogonal inline limit,
// and reset AvailableISize() if found.
for (const ReflowInput* parent = mParentReflowInput; parent != nullptr;
parent = parent->mParentReflowInput) {
if (parent->GetWritingMode().IsOrthogonalTo(mWritingMode) &&
parent->mOrthogonalLimit != NS_UNCONSTRAINEDSIZE) {
SetAvailableISize(parent->mOrthogonalLimit);
break;
}
}
}
LAYOUT_WARN_IF_FALSE(AvailableISize() != NS_UNCONSTRAINEDSIZE,
"have unconstrained inline-size; this should only "
"result from very large sizes, not attempts at "
"intrinsic inline-size calculation");
mStylePosition = mFrame->StylePosition();
mStyleDisplay = mFrame->StyleDisplay();
mStyleBorder = mFrame->StyleBorder();
mStyleMargin = mFrame->StyleMargin();
InitCBReflowInput();
LayoutFrameType type = mFrame->Type();
if (type == mozilla::LayoutFrameType::Placeholder) {
// Placeholders have a no-op Reflow method that doesn't need the rest of
// this initialization, so we bail out early.
mComputedSize.SizeTo(mWritingMode, 0, 0);
return;
}
mFlags.mIsReplaced = mFrame->IsFrameOfType(nsIFrame::eReplaced) ||
mFrame->IsFrameOfType(nsIFrame::eReplacedContainsBlock);
InitConstraints(aPresContext, aContainingBlockSize, aBorder, aPadding, type);
InitResizeFlags(aPresContext, type);
InitDynamicReflowRoot();
nsIFrame* parent = mFrame->GetParent();
if (parent && parent->HasAnyStateBits(NS_FRAME_IN_CONSTRAINED_BSIZE) &&
!(parent->IsScrollFrame() &&
parent->StyleDisplay()->mOverflowY != StyleOverflow::Hidden)) {
mFrame->AddStateBits(NS_FRAME_IN_CONSTRAINED_BSIZE);
} else if (type == LayoutFrameType::SVGForeignObject) {
// An SVG foreignObject frame is inherently constrained block-size.
mFrame->AddStateBits(NS_FRAME_IN_CONSTRAINED_BSIZE);
} else {
const auto& bSizeCoord = mStylePosition->BSize(mWritingMode);
const auto& maxBSizeCoord = mStylePosition->MaxBSize(mWritingMode);
if ((!bSizeCoord.BehavesLikeInitialValueOnBlockAxis() ||
!maxBSizeCoord.BehavesLikeInitialValueOnBlockAxis()) &&
// Don't set NS_FRAME_IN_CONSTRAINED_BSIZE on body or html elements.
(mFrame->GetContent() && !(mFrame->GetContent()->IsAnyOfHTMLElements(
nsGkAtoms::body, nsGkAtoms::html)))) {
// If our block-size was specified as a percentage, then this could
// actually resolve to 'auto', based on:
// http://www.w3.org/TR/CSS21/visudet.html#the-height-property
nsIFrame* containingBlk = mFrame;
while (containingBlk) {
const nsStylePosition* stylePos = containingBlk->StylePosition();
const auto& bSizeCoord = stylePos->BSize(mWritingMode);
const auto& maxBSizeCoord = stylePos->MaxBSize(mWritingMode);
if ((bSizeCoord.IsLengthPercentage() && !bSizeCoord.HasPercent()) ||
(maxBSizeCoord.IsLengthPercentage() &&
!maxBSizeCoord.HasPercent())) {
mFrame->AddStateBits(NS_FRAME_IN_CONSTRAINED_BSIZE);
break;
} else if (bSizeCoord.HasPercent() || maxBSizeCoord.HasPercent()) {
if (!(containingBlk = containingBlk->GetContainingBlock())) {
// If we've reached the top of the tree, then we don't have
// a constrained block-size.
mFrame->RemoveStateBits(NS_FRAME_IN_CONSTRAINED_BSIZE);
break;
}
continue;
} else {
mFrame->RemoveStateBits(NS_FRAME_IN_CONSTRAINED_BSIZE);
break;
}
}
} else {
mFrame->RemoveStateBits(NS_FRAME_IN_CONSTRAINED_BSIZE);
}
}
if (mParentReflowInput &&
mParentReflowInput->GetWritingMode().IsOrthogonalTo(mWritingMode)) {
// Orthogonal frames are always reflowed with an unconstrained
// dimension to avoid incomplete reflow across an orthogonal
// boundary. Normally this is the block-size, but for column sets
// with auto-height it's the inline-size, so that they can add
// columns in the container's block direction
if (type == LayoutFrameType::ColumnSet &&
mStylePosition->ISize(mWritingMode).IsAuto()) {
SetComputedISize(NS_UNCONSTRAINEDSIZE, ResetResizeFlags::No);
} else {
SetAvailableBSize(NS_UNCONSTRAINEDSIZE);
}
}
if (mFrame->GetContainSizeAxes().mBContained) {
// In the case that a box is size contained in block axis, we want to ensure
// that it is also monolithic. We do this by setting AvailableBSize() to an
// unconstrained size to avoid fragmentation.
SetAvailableBSize(NS_UNCONSTRAINEDSIZE);
}
LAYOUT_WARN_IF_FALSE((mStyleDisplay->IsInlineOutsideStyle() &&
!mFrame->IsFrameOfType(nsIFrame::eReplaced)) ||
type == LayoutFrameType::Text ||
ComputedISize() != NS_UNCONSTRAINEDSIZE,
"have unconstrained inline-size; this should only "
"result from very large sizes, not attempts at "
"intrinsic inline-size calculation");
}
void ReflowInput::InitCBReflowInput() {
if (!mParentReflowInput) {
mCBReflowInput = nullptr;
return;
}
if (mParentReflowInput->mFlags.mDummyParentReflowInput) {
mCBReflowInput = mParentReflowInput;
return;
}
if (mParentReflowInput->mFrame ==
mFrame->GetContainingBlock(0, mStyleDisplay)) {
// Inner table frames need to use the containing block of the outer
// table frame.
if (mFrame->IsTableFrame()) {
mCBReflowInput = mParentReflowInput->mCBReflowInput;
} else {
mCBReflowInput = mParentReflowInput;
}
} else {
mCBReflowInput = mParentReflowInput->mCBReflowInput;
}
}
/* Check whether CalcQuirkContainingBlockHeight would stop on the
* given reflow input, using its block as a height. (essentially
* returns false for any case in which CalcQuirkContainingBlockHeight
* has a "continue" in its main loop.)
*
* XXX Maybe refactor CalcQuirkContainingBlockHeight so it uses
* this function as well
*/
static bool IsQuirkContainingBlockHeight(const ReflowInput* rs,
LayoutFrameType aFrameType) {
if (LayoutFrameType::Block == aFrameType ||
LayoutFrameType::Scroll == aFrameType) {
// Note: This next condition could change due to a style change,
// but that would cause a style reflow anyway, which means we're ok.
if (NS_UNCONSTRAINEDSIZE == rs->ComputedHeight()) {
if (!rs->mFrame->IsAbsolutelyPositioned(rs->mStyleDisplay)) {
return false;
}
}
}
return true;
}
void ReflowInput::InitResizeFlags(nsPresContext* aPresContext,
LayoutFrameType aFrameType) {
SetBResize(false);
SetIResize(false);
mFlags.mIsBResizeForPercentages = false;
const WritingMode wm = mWritingMode; // just a shorthand
// We should report that we have a resize in the inline dimension if
// *either* the border-box size or the content-box size in that
// dimension has changed. It might not actually be necessary to do
// this if the border-box size has changed and the content-box size
// has not changed, but since we've historically used the flag to mean
// border-box size change, continue to do that. It's possible for
// the content-box size to change without a border-box size change or
// a style change given (1) a fixed width (possibly fixed by max-width
// or min-width), box-sizing:border-box, and percentage padding;
// (2) box-sizing:content-box, M% width, and calc(Npx - M%) padding.
//
// However, we don't actually have the information at this point to tell
// whether the content-box size has changed, since both style data and the
// UsedPaddingProperty() have already been updated in
// SizeComputationInput::InitOffsets(). So, we check the HasPaddingChange()
// bit for the cases where it's possible for the content-box size to have
// changed without either (a) a change in the border-box size or (b) an
// nsChangeHint_NeedDirtyReflow change hint due to change in border or
// padding.
//
// We don't clear the HasPaddingChange() bit here, since sometimes we
// construct reflow input (e.g. in nsBlockFrame::ReflowBlockFrame to compute
// margin collapsing) without reflowing the frame. Instead, we clear it in
// nsIFrame::DidReflow().
bool isIResize =
// is the border-box resizing?
mFrame->ISize(wm) !=
ComputedISize() + ComputedLogicalBorderPadding(wm).IStartEnd(wm) ||
// or is the content-box resizing? (see comment above)
mFrame->HasPaddingChange();
if (mFrame->HasAnyStateBits(NS_FRAME_FONT_INFLATION_FLOW_ROOT) &&
nsLayoutUtils::FontSizeInflationEnabled(aPresContext)) {
// Create our font inflation data if we don't have it already, and
// give it our current width information.
bool dirty = nsFontInflationData::UpdateFontInflationDataISizeFor(*this) &&
// Avoid running this at the box-to-block interface
// (where we shouldn't be inflating anyway, and where
// reflow input construction is probably to construct a
// dummy parent reflow input anyway).
!mFlags.mDummyParentReflowInput;
if (dirty || (!mFrame->GetParent() && isIResize)) {
// When font size inflation is enabled, a change in either:
// * the effective width of a font inflation flow root
// * the width of the frame
// needs to cause a dirty reflow since they change the font size
// inflation calculations, which in turn change the size of text,
// line-heights, etc. This is relatively similar to a classic
// case of style change reflow, except that because inflation
// doesn't affect the intrinsic sizing codepath, there's no need
// to invalidate intrinsic sizes.
//
// Note that this makes horizontal resizing a good bit more
// expensive. However, font size inflation is targeted at a set of
// devices (zoom-and-pan devices) where the main use case for
// horizontal resizing needing to be efficient (window resizing) is
// not present. It does still increase the cost of dynamic changes
// caused by script where a style or content change in one place
// causes a resize in another (e.g., rebalancing a table).
// FIXME: This isn't so great for the cases where
// ReflowInput::SetComputedWidth is called, if the first time
// we go through InitResizeFlags we set IsHResize() to true, and then
// the second time we'd set it to false even without the
// NS_FRAME_IS_DIRTY bit already set.
if (mFrame->IsSVGForeignObjectFrame()) {
// Foreign object frames use dirty bits in a special way.
mFrame->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN);
nsIFrame* kid = mFrame->PrincipalChildList().FirstChild();
if (kid) {
kid->MarkSubtreeDirty();
}
} else {
mFrame->MarkSubtreeDirty();
}
// Mark intrinsic widths on all descendants dirty. We need to do
// this (1) since we're changing the size of text and need to
// clear text runs on text frames and (2) since we actually are
// changing some intrinsic widths, but only those that live inside
// of containers.
// It makes sense to do this for descendants but not ancestors
// (which is unusual) because we're only changing the unusual
// inflation-dependent intrinsic widths (i.e., ones computed with
// nsPresContext::mInflationDisabledForShrinkWrap set to false),
// which should never affect anything outside of their inflation
// flow root (or, for that matter, even their inflation
// container).
// This is also different from what PresShell::FrameNeedsReflow
// does because it doesn't go through placeholders. It doesn't
// need to because we're actually doing something that cares about
// frame tree geometry (the width on an ancestor) rather than
// style.
AutoTArray<nsIFrame*, 32> stack;
stack.AppendElement(mFrame);
do {
nsIFrame* f = stack.PopLastElement();
for (const auto& childList : f->ChildLists()) {
for (nsIFrame* kid : childList.mList) {
kid->MarkIntrinsicISizesDirty();
stack.AppendElement(kid);
}
}
} while (stack.Length() != 0);
}
}
SetIResize(!mFrame->HasAnyStateBits(NS_FRAME_IS_DIRTY) && isIResize);
// XXX Should we really need to null check mCBReflowInput? (We do for
// at least nsBoxFrame).
if (mFrame->HasBSizeChange()) {
// When we have an nsChangeHint_UpdateComputedBSize, we'll set a bit
// on the frame to indicate we're resizing. This might catch cases,
// such as a change between auto and a length, where the box doesn't
// actually resize but children with percentages resize (since those
// percentages become auto if their containing block is auto).
SetBResize(true);
mFlags.mIsBResizeForPercentages = true;
// We don't clear the HasBSizeChange state here, since sometimes we
// construct a ReflowInput (e.g. in nsBlockFrame::ReflowBlockFrame to
// compute margin collapsing) without reflowing the frame. Instead, we
// clear it in nsIFrame::DidReflow.
} else if (mCBReflowInput &&
mCBReflowInput->IsBResizeForPercentagesForWM(wm) &&
(mStylePosition->BSize(wm).HasPercent() ||
mStylePosition->MinBSize(wm).HasPercent() ||
mStylePosition->MaxBSize(wm).HasPercent())) {
// We have a percentage (or calc-with-percentage) block-size, and the
// value it's relative to has changed.
SetBResize(true);
mFlags.mIsBResizeForPercentages = true;
} else if (aFrameType == LayoutFrameType::TableCell &&
(mFlags.mSpecialBSizeReflow ||
mFrame->FirstInFlow()->HasAnyStateBits(
NS_TABLE_CELL_HAD_SPECIAL_REFLOW)) &&
mFrame->HasAnyStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE)) {
// Need to set the bit on the cell so that
// mCBReflowInput->IsBResize() is set correctly below when
// reflowing descendant.
SetBResize(true);
mFlags.mIsBResizeForPercentages = true;
} else if (mCBReflowInput && mFrame->IsBlockWrapper()) {
// XXX Is this problematic for relatively positioned inlines acting
// as containing block for absolutely positioned elements?
// Possibly; in that case we should at least be checking
// IsSubtreeDirty(), I'd think.
SetBResize(mCBReflowInput->IsBResizeForWM(wm));
mFlags.mIsBResizeForPercentages =
mCBReflowInput->IsBResizeForPercentagesForWM(wm);
} else if (ComputedBSize() == NS_UNCONSTRAINEDSIZE) {
// We have an 'auto' block-size.
if (eCompatibility_NavQuirks == aPresContext->CompatibilityMode() &&
mCBReflowInput) {
// FIXME: This should probably also check IsIResize().
SetBResize(mCBReflowInput->IsBResizeForWM(wm));
} else {
SetBResize(IsIResize());
}
SetBResize(IsBResize() || mFrame->IsSubtreeDirty());
} else {
// We have a non-'auto' block-size, i.e., a length. Set the BResize
// flag to whether the size is actually different.
SetBResize(mFrame->BSize(wm) !=
ComputedBSize() +
ComputedLogicalBorderPadding(wm).BStartEnd(wm));
}
bool dependsOnCBBSize = (mStylePosition->BSizeDependsOnContainer(wm) &&
// FIXME: condition this on not-abspos?
!mStylePosition->BSize(wm).IsAuto()) ||
mStylePosition->MinBSizeDependsOnContainer(wm) ||
mStylePosition->MaxBSizeDependsOnContainer(wm) ||
mStylePosition->mOffset.GetBStart(wm).HasPercent() ||
!mStylePosition->mOffset.GetBEnd(wm).IsAuto() ||
mFrame->IsXULBoxFrame();
// If mFrame is a flex item, and mFrame's block axis is the flex container's
// main axis (e.g. in a column-oriented flex container with same
// writing-mode), then its block-size depends on its CB size, if its
// flex-basis has a percentage.
if (mFrame->IsFlexItem() &&
!nsFlexContainerFrame::IsItemInlineAxisMainAxis(mFrame)) {
const auto& flexBasis = mStylePosition->mFlexBasis;
dependsOnCBBSize |= (flexBasis.IsSize() && flexBasis.AsSize().HasPercent());
}
if (mFrame->StyleText()->mLineHeight.IsMozBlockHeight()) {
// line-height depends on block bsize
mFrame->AddStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE);
// but only on containing blocks if this frame is not a suitable block
dependsOnCBBSize |= !nsLayoutUtils::IsNonWrapperBlock(mFrame);
}
// If we're the descendant of a table cell that performs special bsize
// reflows and we could be the child that requires them, always set
// the block-axis resize in case this is the first pass before the
// special bsize reflow. However, don't do this if it actually is
// the special bsize reflow, since in that case it will already be
// set correctly above if we need it set.
if (!IsBResize() && mCBReflowInput &&
(mCBReflowInput->mFrame->IsTableCellFrame() ||
mCBReflowInput->mFlags.mHeightDependsOnAncestorCell) &&
!mCBReflowInput->mFlags.mSpecialBSizeReflow && dependsOnCBBSize) {
SetBResize(true);
mFlags.mHeightDependsOnAncestorCell = true;
}
// Set NS_FRAME_CONTAINS_RELATIVE_BSIZE if it's needed.
// It would be nice to check that |ComputedBSize != NS_UNCONSTRAINEDSIZE|
// &&ed with the percentage bsize check. However, this doesn't get
// along with table special bsize reflows, since a special bsize
// reflow (a quirk that makes such percentage height work on children
// of table cells) can cause not just a single percentage height to
// become fixed, but an entire descendant chain of percentage height
// to become fixed.
if (dependsOnCBBSize && mCBReflowInput) {
const ReflowInput* rs = this;
bool hitCBReflowInput = false;
do {
rs = rs->mParentReflowInput;
if (!rs) {
break;
}
if (rs->mFrame->HasAnyStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE)) {
break; // no need to go further
}
rs->mFrame->AddStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE);
// Keep track of whether we've hit the containing block, because
// we need to go at least that far.
if (rs == mCBReflowInput) {
hitCBReflowInput = true;
}
// XXX What about orthogonal flows? It doesn't make sense to
// keep propagating this bit across an orthogonal boundary,
// where the meaning of BSize changes. Bug 1175517.
} while (!hitCBReflowInput ||
(eCompatibility_NavQuirks == aPresContext->CompatibilityMode() &&
!IsQuirkContainingBlockHeight(rs, rs->mFrame->Type())));
// Note: We actually don't need to set the
// NS_FRAME_CONTAINS_RELATIVE_BSIZE bit for the cases
// where we hit the early break statements in
// CalcQuirkContainingBlockHeight. But it doesn't hurt
// us to set the bit in these cases.
}
if (mFrame->HasAnyStateBits(NS_FRAME_IS_DIRTY)) {
// If we're reflowing everything, then we'll find out if we need
// to re-set this.
mFrame->RemoveStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE);
}
}
void ReflowInput::InitDynamicReflowRoot() {
if (mFrame->CanBeDynamicReflowRoot()) {
mFrame->AddStateBits(NS_FRAME_DYNAMIC_REFLOW_ROOT);
} else {
mFrame->RemoveStateBits(NS_FRAME_DYNAMIC_REFLOW_ROOT);
}
}
bool ReflowInput::ShouldApplyAutomaticMinimumOnBlockAxis() const {
MOZ_ASSERT(!mFrame->IsFrameOfType(nsIFrame::eReplacedSizing));
return mFlags.mIsBSizeSetByAspectRatio &&
!mStyleDisplay->IsScrollableOverflow() &&
mStylePosition->MinBSize(GetWritingMode()).IsAuto();
}
bool ReflowInput::IsInFragmentedContext() const {
// We consider mFrame with a prev-in-flow being in a fragmented context
// because nsColumnSetFrame can reflow its last column with an unconstrained
// available block-size.
return AvailableBSize() != NS_UNCONSTRAINEDSIZE || mFrame->GetPrevInFlow();
}
/* static */
LogicalMargin ReflowInput::ComputeRelativeOffsets(WritingMode aWM,
nsIFrame* aFrame,
const LogicalSize& aCBSize) {
LogicalMargin offsets(aWM);
const nsStylePosition* position = aFrame->StylePosition();
// Compute the 'inlineStart' and 'inlineEnd' values. 'inlineStart'
// moves the boxes to the end of the line, and 'inlineEnd' moves the
// boxes to the start of the line. The computed values are always:
// inlineStart=-inlineEnd
const auto& inlineStart = position->mOffset.GetIStart(aWM);
const auto& inlineEnd = position->mOffset.GetIEnd(aWM);
bool inlineStartIsAuto = inlineStart.IsAuto();
bool inlineEndIsAuto = inlineEnd.IsAuto();
// If neither 'inlineStart' nor 'inlineEnd' is auto, then we're
// over-constrained and we ignore one of them
if (!inlineStartIsAuto && !inlineEndIsAuto) {
inlineEndIsAuto = true;
}
if (inlineStartIsAuto) {
if (inlineEndIsAuto) {
// If both are 'auto' (their initial values), the computed values are 0
offsets.IStart(aWM) = offsets.IEnd(aWM) = 0;
} else {
// 'inlineEnd' isn't 'auto' so compute its value
offsets.IEnd(aWM) =
nsLayoutUtils::ComputeCBDependentValue(aCBSize.ISize(aWM), inlineEnd);
// Computed value for 'inlineStart' is minus the value of 'inlineEnd'
offsets.IStart(aWM) = -offsets.IEnd(aWM);
}
} else {
NS_ASSERTION(inlineEndIsAuto, "unexpected specified constraint");
// 'InlineStart' isn't 'auto' so compute its value
offsets.IStart(aWM) =
nsLayoutUtils::ComputeCBDependentValue(aCBSize.ISize(aWM), inlineStart);
// Computed value for 'inlineEnd' is minus the value of 'inlineStart'
offsets.IEnd(aWM) = -offsets.IStart(aWM);
}
// Compute the 'blockStart' and 'blockEnd' values. The 'blockStart'
// and 'blockEnd' properties move relatively positioned elements in
// the block progression direction. They also must be each other's
// negative
const auto& blockStart = position->mOffset.GetBStart(aWM);
const auto& blockEnd = position->mOffset.GetBEnd(aWM);
bool blockStartIsAuto = blockStart.IsAuto();
bool blockEndIsAuto = blockEnd.IsAuto();
// Check for percentage based values and a containing block block-size
// that depends on the content block-size. Treat them like 'auto'
if (NS_UNCONSTRAINEDSIZE == aCBSize.BSize(aWM)) {
if (blockStart.HasPercent()) {
blockStartIsAuto = true;
}
if (blockEnd.HasPercent()) {
blockEndIsAuto = true;
}
}
// If neither is 'auto', 'block-end' is ignored
if (!blockStartIsAuto && !blockEndIsAuto) {
blockEndIsAuto = true;
}
if (blockStartIsAuto) {
if (blockEndIsAuto) {
// If both are 'auto' (their initial values), the computed values are 0
offsets.BStart(aWM) = offsets.BEnd(aWM) = 0;
} else {
// 'blockEnd' isn't 'auto' so compute its value
offsets.BEnd(aWM) = nsLayoutUtils::ComputeBSizeDependentValue(
aCBSize.BSize(aWM), blockEnd);
// Computed value for 'blockStart' is minus the value of 'blockEnd'
offsets.BStart(aWM) = -offsets.BEnd(aWM);
}
} else {
NS_ASSERTION(blockEndIsAuto, "unexpected specified constraint");
// 'blockStart' isn't 'auto' so compute its value
offsets.BStart(aWM) = nsLayoutUtils::ComputeBSizeDependentValue(
aCBSize.BSize(aWM), blockStart);
// Computed value for 'blockEnd' is minus the value of 'blockStart'
offsets.BEnd(aWM) = -offsets.BStart(aWM);
}
// Convert the offsets to physical coordinates and store them on the frame
const nsMargin physicalOffsets = offsets.GetPhysicalMargin(aWM);
if (nsMargin* prop =
aFrame->GetProperty(nsIFrame::ComputedOffsetProperty())) {
*prop = physicalOffsets;
} else {
aFrame->AddProperty(nsIFrame::ComputedOffsetProperty(),
new nsMargin(physicalOffsets));
}
NS_ASSERTION(offsets.IStart(aWM) == -offsets.IEnd(aWM) &&
offsets.BStart(aWM) == -offsets.BEnd(aWM),
"ComputeRelativeOffsets should return valid results!");
return offsets;
}
/* static */
void ReflowInput::ApplyRelativePositioning(nsIFrame* aFrame,
const nsMargin& aComputedOffsets,
nsPoint* aPosition) {
if (!aFrame->IsRelativelyOrStickyPositioned()) {
NS_ASSERTION(!aFrame->HasProperty(nsIFrame::NormalPositionProperty()),
"We assume that changing the 'position' property causes "
"frame reconstruction. If that ever changes, this code "
"should call "
"aFrame->RemoveProperty(nsIFrame::NormalPositionProperty())");
return;
}
// Store the normal position
aFrame->SetProperty(nsIFrame::NormalPositionProperty(), *aPosition);
const nsStyleDisplay* display = aFrame->StyleDisplay();
if (StylePositionProperty::Relative == display->mPosition) {
*aPosition += nsPoint(aComputedOffsets.left, aComputedOffsets.top);
} else if (StylePositionProperty::Sticky == display->mPosition &&
!aFrame->GetNextContinuation() && !aFrame->GetPrevContinuation() &&
!aFrame->HasAnyStateBits(NS_FRAME_PART_OF_IBSPLIT)) {
// Sticky positioning for elements with multiple frames needs to be
// computed all at once. We can't safely do that here because we might be
// partway through (re)positioning the frames, so leave it until the scroll
// container reflows and calls StickyScrollContainer::UpdatePositions.
// For single-frame sticky positioned elements, though, go ahead and apply
// it now to avoid unnecessary overflow updates later.
StickyScrollContainer* ssc =
StickyScrollContainer::GetStickyScrollContainerForFrame(aFrame);
if (ssc) {
*aPosition = ssc->ComputePosition(aFrame);
}
}
}
// static
void ReflowInput::ComputeAbsPosInlineAutoMargin(nscoord aAvailMarginSpace,
WritingMode aContainingBlockWM,
bool aIsMarginIStartAuto,
bool aIsMarginIEndAuto,
LogicalMargin& aMargin,
LogicalMargin& aOffsets) {
if (aIsMarginIStartAuto) {
if (aIsMarginIEndAuto) {
if (aAvailMarginSpace < 0) {
// Note that this case is different from the neither-'auto'
// case below, where the spec says to ignore 'left'/'right'.
// Ignore the specified value for 'margin-right'.
aMargin.IEnd(aContainingBlockWM) = aAvailMarginSpace;
} else {
// Both 'margin-left' and 'margin-right' are 'auto', so they get
// equal values
aMargin.IStart(aContainingBlockWM) = aAvailMarginSpace / 2;
aMargin.IEnd(aContainingBlockWM) =
aAvailMarginSpace - aMargin.IStart(aContainingBlockWM);
}
} else {
// Just 'margin-left' is 'auto'
aMargin.IStart(aContainingBlockWM) = aAvailMarginSpace;
}
} else {
if (aIsMarginIEndAuto) {
// Just 'margin-right' is 'auto'
aMargin.IEnd(aContainingBlockWM) = aAvailMarginSpace;
} else {
// We're over-constrained so use the direction of the containing
// block to dictate which value to ignore. (And note that the
// spec says to ignore 'left' or 'right' rather than
// 'margin-left' or 'margin-right'.)
// Note that this case is different from the both-'auto' case
// above, where the spec says to ignore
// 'margin-left'/'margin-right'.
// Ignore the specified value for 'right'.
aOffsets.IEnd(aContainingBlockWM) += aAvailMarginSpace;
}
}
}
// static
void ReflowInput::ComputeAbsPosBlockAutoMargin(nscoord aAvailMarginSpace,
WritingMode aContainingBlockWM,
bool aIsMarginBStartAuto,
bool aIsMarginBEndAuto,
LogicalMargin& aMargin,
LogicalMargin& aOffsets) {
if (aIsMarginBStartAuto) {
if (aIsMarginBEndAuto) {
// Both 'margin-top' and 'margin-bottom' are 'auto', so they get
// equal values
aMargin.BStart(aContainingBlockWM) = aAvailMarginSpace / 2;
aMargin.BEnd(aContainingBlockWM) =
aAvailMarginSpace - aMargin.BStart(aContainingBlockWM);
} else {
// Just margin-block-start is 'auto'
aMargin.BStart(aContainingBlockWM) = aAvailMarginSpace;
}
} else {
if (aIsMarginBEndAuto) {
// Just margin-block-end is 'auto'
aMargin.BEnd(aContainingBlockWM) = aAvailMarginSpace;
} else {
// We're over-constrained so ignore the specified value for
// block-end. (And note that the spec says to ignore 'bottom'
// rather than 'margin-bottom'.)
aOffsets.BEnd(aContainingBlockWM) += aAvailMarginSpace;
}
}
}
void ReflowInput::ApplyRelativePositioning(
nsIFrame* aFrame, mozilla::WritingMode aWritingMode,
const mozilla::LogicalMargin& aComputedOffsets,
mozilla::LogicalPoint* aPosition, const nsSize& aContainerSize) {
// Subtract the size of the frame from the container size that we
// use for converting between the logical and physical origins of
// the frame. This accounts for the fact that logical origins in RTL
// coordinate systems are at the top right of the frame instead of
// the top left.
nsSize frameSize = aFrame->GetSize();
nsPoint pos =
aPosition->GetPhysicalPoint(aWritingMode, aContainerSize - frameSize);
ApplyRelativePositioning(
aFrame, aComputedOffsets.GetPhysicalMargin(aWritingMode), &pos);
*aPosition =
mozilla::LogicalPoint(aWritingMode, pos, aContainerSize - frameSize);
}
// Returns true if aFrame is non-null, a XUL frame, and "XUL-collapsed" (which
// only becomes a valid question to ask if we know it's a XUL frame).
static bool IsXULCollapsedXULFrame(nsIFrame* aFrame) {
return aFrame && aFrame->IsXULBoxFrame() && aFrame->IsXULCollapsed();
}
nsIFrame* ReflowInput::GetHypotheticalBoxContainer(nsIFrame* aFrame,
nscoord& aCBIStartEdge,
LogicalSize& aCBSize) const {
aFrame = aFrame->GetContainingBlock();
NS_ASSERTION(aFrame != mFrame, "How did that happen?");
/* Now aFrame is the containing block we want */
/* Check whether the containing block is currently being reflowed.
If so, use the info from the reflow input. */
const ReflowInput* reflowInput;
if (aFrame->HasAnyStateBits(NS_FRAME_IN_REFLOW)) {
for (reflowInput = mParentReflowInput;
reflowInput && reflowInput->mFrame != aFrame;
reflowInput = reflowInput->mParentReflowInput) {
/* do nothing */
}
} else {
reflowInput = nullptr;
}
if (reflowInput) {
WritingMode wm = reflowInput->GetWritingMode();
NS_ASSERTION(wm == aFrame->GetWritingMode(), "unexpected writing mode");
aCBIStartEdge = reflowInput->ComputedLogicalBorderPadding(wm).IStart(wm);
aCBSize = reflowInput->ComputedSize(wm);
} else {
/* Didn't find a reflow reflowInput for aFrame. Just compute the
information we want, on the assumption that aFrame already knows its
size. This really ought to be true by now. */
NS_ASSERTION(!aFrame->HasAnyStateBits(NS_FRAME_IN_REFLOW),
"aFrame shouldn't be in reflow; we'll lie if it is");
WritingMode wm = aFrame->GetWritingMode();
// Compute CB's offset & content-box size by subtracting borderpadding from
// frame size. Exception: if the CB is 0-sized, it *might* be a child of a
// XUL-collapsed frame and might have nonzero borderpadding that was simply
// discarded during its layout. (See the child-zero-sizing in
// nsSprocketLayout::XULLayout()). In that case, we ignore the
// borderpadding here (just like we did when laying it out), or else we'd
// produce a bogus negative content-box size.
aCBIStartEdge = 0;
aCBSize = aFrame->GetLogicalSize(wm);
if (!aCBSize.IsAllZero() ||
(!IsXULCollapsedXULFrame(aFrame->GetParent()))) {
// aFrame is not XUL-collapsed (nor is it a child of a XUL-collapsed
// frame), so we can go ahead and subtract out border padding.
LogicalMargin borderPadding = aFrame->GetLogicalUsedBorderAndPadding(wm);
aCBIStartEdge += borderPadding.IStart(wm);
aCBSize -= borderPadding.Size(wm);
}
}
return aFrame;
}
struct nsHypotheticalPosition {
// offset from inline-start edge of containing block (which is a padding edge)
nscoord mIStart;
// offset from block-start edge of containing block (which is a padding edge)
nscoord mBStart;
WritingMode mWritingMode;
};
/**
* aInsideBoxSizing returns the part of the padding, border, and margin
* in the aAxis dimension that goes inside the edge given by box-sizing;
* aOutsideBoxSizing returns the rest.
*/
void ReflowInput::CalculateBorderPaddingMargin(
LogicalAxis aAxis, nscoord aContainingBlockSize, nscoord* aInsideBoxSizing,
nscoord* aOutsideBoxSizing) const {
WritingMode wm = GetWritingMode();
mozilla::Side startSide =
wm.PhysicalSide(MakeLogicalSide(aAxis, eLogicalEdgeStart));
mozilla::Side endSide =
wm.PhysicalSide(MakeLogicalSide(aAxis, eLogicalEdgeEnd));
nsMargin styleBorder = mStyleBorder->GetComputedBorder();
nscoord borderStartEnd =
styleBorder.Side(startSide) + styleBorder.Side(endSide);
nscoord paddingStartEnd, marginStartEnd;
// See if the style system can provide us the padding directly
const auto* stylePadding = mFrame->StylePadding();
if (nsMargin padding; stylePadding->GetPadding(padding)) {
paddingStartEnd = padding.Side(startSide) + padding.Side(endSide);
} else {
// We have to compute the start and end values
nscoord start, end;
start = nsLayoutUtils::ComputeCBDependentValue(
aContainingBlockSize, stylePadding->mPadding.Get(startSide));
end = nsLayoutUtils::ComputeCBDependentValue(
aContainingBlockSize, stylePadding->mPadding.Get(endSide));
paddingStartEnd = start + end;
}
// See if the style system can provide us the margin directly
if (nsMargin margin; mStyleMargin->GetMargin(margin)) {
marginStartEnd = margin.Side(startSide) + margin.Side(endSide);
} else {
nscoord start, end;
// We have to compute the start and end values
if (mStyleMargin->mMargin.Get(startSide).IsAuto()) {
// We set this to 0 for now, and fix it up later in
// InitAbsoluteConstraints (which is caller of this function, via
// CalculateHypotheticalPosition).
start = 0;
} else {
start = nsLayoutUtils::ComputeCBDependentValue(
aContainingBlockSize, mStyleMargin->mMargin.Get(startSide));
}
if (mStyleMargin->mMargin.Get(endSide).IsAuto()) {
// We set this to 0 for now, and fix it up later in
// InitAbsoluteConstraints (which is caller of this function, via
// CalculateHypotheticalPosition).
end = 0;
} else {
end = nsLayoutUtils::ComputeCBDependentValue(
aContainingBlockSize, mStyleMargin->mMargin.Get(endSide));
}
marginStartEnd = start + end;
}
nscoord outside = paddingStartEnd + borderStartEnd + marginStartEnd;
nscoord inside = 0;
if (mStylePosition->mBoxSizing == StyleBoxSizing::Border) {
inside = borderStartEnd + paddingStartEnd;
}
outside -= inside;
*aInsideBoxSizing = inside;
*aOutsideBoxSizing = outside;
}
/**
* Returns true iff a pre-order traversal of the normal child
* frames rooted at aFrame finds no non-empty frame before aDescendant.
*/
static bool AreAllEarlierInFlowFramesEmpty(nsIFrame* aFrame,
nsIFrame* aDescendant,
bool* aFound) {
if (aFrame == aDescendant) {
*aFound = true;
return true;
}
if (aFrame->IsPlaceholderFrame()) {
auto ph = static_cast<nsPlaceholderFrame*>(aFrame);
MOZ_ASSERT(ph->IsSelfEmpty() && ph->PrincipalChildList().IsEmpty());
ph->SetLineIsEmptySoFar(true);
} else {
if (!aFrame->IsSelfEmpty()) {
*aFound = false;
return false;
}
for (nsIFrame* f : aFrame->PrincipalChildList()) {
bool allEmpty = AreAllEarlierInFlowFramesEmpty(f, aDescendant, aFound);
if (*aFound || !allEmpty) {
return allEmpty;
}
}
}
*aFound = false;
return true;
}
static bool AxisPolarityFlipped(LogicalAxis aThisAxis, WritingMode aThisWm,
WritingMode aOtherWm) {
if (MOZ_LIKELY(aThisWm == aOtherWm)) {
// Dedicated short circuit for the common case.
return false;
}
LogicalAxis otherAxis = aThisWm.IsOrthogonalTo(aOtherWm)
? GetOrthogonalAxis(aThisAxis)
: aThisAxis;
NS_ASSERTION(
aThisWm.PhysicalAxis(aThisAxis) == aOtherWm.PhysicalAxis(otherAxis),
"Physical axes must match!");
Side thisStartSide =
aThisWm.PhysicalSide(MakeLogicalSide(aThisAxis, eLogicalEdgeStart));
Side otherStartSide =
aOtherWm.PhysicalSide(MakeLogicalSide(otherAxis, eLogicalEdgeStart));
return thisStartSide != otherStartSide;
}
static bool InlinePolarityFlipped(WritingMode aThisWm, WritingMode aOtherWm) {
return AxisPolarityFlipped(eLogicalAxisInline, aThisWm, aOtherWm);
}
static bool BlockPolarityFlipped(WritingMode aThisWm, WritingMode aOtherWm) {
return AxisPolarityFlipped(eLogicalAxisBlock, aThisWm, aOtherWm);
}
// Calculate the position of the hypothetical box that the element would have
// if it were in the flow.
// The values returned are relative to the padding edge of the absolute
// containing block. The writing-mode of the hypothetical box position will
// have the same block direction as the absolute containing block, but may
// differ in inline-bidi direction.
// In the code below, |aCBReflowInput->frame| is the absolute containing block,
// while |containingBlock| is the nearest block container of the placeholder
// frame, which may be different from the absolute containing block.
void ReflowInput::CalculateHypotheticalPosition(
nsPresContext* aPresContext, nsPlaceholderFrame* aPlaceholderFrame,
const ReflowInput* aCBReflowInput, nsHypotheticalPosition& aHypotheticalPos,
LayoutFrameType aFrameType) const {
NS_ASSERTION(mStyleDisplay->mOriginalDisplay != StyleDisplay::None,
"mOriginalDisplay has not been properly initialized");
// Find the nearest containing block frame to the placeholder frame,
// and its inline-start edge and width.
nscoord blockIStartContentEdge;
// Dummy writing mode for blockContentSize, will be changed as needed by
// GetHypotheticalBoxContainer.
WritingMode cbwm = aCBReflowInput->GetWritingMode();
LogicalSize blockContentSize(cbwm);
nsIFrame* containingBlock = GetHypotheticalBoxContainer(
aPlaceholderFrame, blockIStartContentEdge, blockContentSize);
// Now blockContentSize is in containingBlock's writing mode.
// If it's a replaced element and it has a 'auto' value for
//'inline size', see if we can get the intrinsic size. This will allow
// us to exactly determine both the inline edges
WritingMode wm = containingBlock->GetWritingMode();
const auto& styleISize = mStylePosition->ISize(wm);
bool isAutoISize = styleISize.IsAuto();
Maybe<nsSize> intrinsicSize;
if (mFlags.mIsReplaced && isAutoISize) {
// See if we can get the intrinsic size of the element
intrinsicSize = mFrame->GetIntrinsicSize().ToSize();
}
// See if we can calculate what the box inline size would have been if
// the element had been in the flow
Maybe<nscoord> boxISize;
if (mStyleDisplay->IsOriginalDisplayInlineOutside() && !mFlags.mIsReplaced) {
// For non-replaced inline-level elements the 'inline size' property
// doesn't apply, so we don't know what the inline size would have
// been without reflowing it
} else {
// It's either a replaced inline-level element or a block-level element
// Determine the total amount of inline direction
// border/padding/margin that the element would have had if it had
// been in the flow. Note that we ignore any 'auto' and 'inherit'
// values
nscoord insideBoxISizing, outsideBoxISizing;
CalculateBorderPaddingMargin(eLogicalAxisInline, blockContentSize.ISize(wm),
&insideBoxISizing, &outsideBoxISizing);
if (mFlags.mIsReplaced && isAutoISize) {
// It's a replaced element with an 'auto' inline size so the box
// inline size is its intrinsic size plus any border/padding/margin
if (intrinsicSize) {
boxISize.emplace(LogicalSize(wm, *intrinsicSize).ISize(wm) +
outsideBoxISizing + insideBoxISizing);
}
} else if (isAutoISize) {
// The box inline size is the containing block inline size
boxISize.emplace(blockContentSize.ISize(wm));
} else {
// We need to compute it. It's important we do this, because if it's
// percentage based this computed value may be different from the computed
// value calculated using the absolute containing block width
nscoord insideBoxBSizing, dummy;
CalculateBorderPaddingMargin(eLogicalAxisBlock,
blockContentSize.BSize(wm),
&insideBoxBSizing, &dummy);
boxISize.emplace(
ComputeISizeValue(wm, blockContentSize,
LogicalSize(wm, insideBoxISizing, insideBoxBSizing),
outsideBoxISizing, styleISize) +
insideBoxISizing + outsideBoxISizing);
}
}
// Get the placeholder x-offset and y-offset in the coordinate
// space of its containing block
// XXXbz the placeholder is not fully reflowed yet if our containing block is
// relatively positioned...
nsSize containerSize =
containingBlock->HasAnyStateBits(NS_FRAME_IN_REFLOW)
? aCBReflowInput->ComputedSizeAsContainerIfConstrained()
: containingBlock->GetSize();
LogicalPoint placeholderOffset(
wm, aPlaceholderFrame->GetOffsetToIgnoringScrolling(containingBlock),
containerSize);
// First, determine the hypothetical box's mBStart. We want to check the
// content insertion frame of containingBlock for block-ness, but make
// sure to compute all coordinates in the coordinate system of
// containingBlock.
nsBlockFrame* blockFrame =
do_QueryFrame(containingBlock->GetContentInsertionFrame());
if (blockFrame) {
// Use a null containerSize to convert a LogicalPoint functioning as a
// vector into a physical nsPoint vector.
const nsSize nullContainerSize;
LogicalPoint blockOffset(
wm, blockFrame->GetOffsetToIgnoringScrolling(containingBlock),
nullContainerSize);
bool isValid;
nsBlockInFlowLineIterator iter(blockFrame, aPlaceholderFrame, &isValid);
if (!isValid) {
// Give up. We're probably dealing with somebody using
// position:absolute inside native-anonymous content anyway.
aHypotheticalPos.mBStart = placeholderOffset.B(wm);
} else {
NS_ASSERTION(iter.GetContainer() == blockFrame,
"Found placeholder in wrong block!");
nsBlockFrame::LineIterator lineBox = iter.GetLine();
// How we determine the hypothetical box depends on whether the element
// would have been inline-level or block-level
LogicalRect lineBounds = lineBox->GetBounds().ConvertTo(
wm, lineBox->mWritingMode, lineBox->mContainerSize);
if (mStyleDisplay->IsOriginalDisplayInlineOutside()) {
// Use the block-start of the inline box which the placeholder lives in
// as the hypothetical box's block-start.
aHypotheticalPos.mBStart = lineBounds.BStart(wm) + blockOffset.B(wm);
} else {
// The element would have been block-level which means it would
// be below the line containing the placeholder frame, unless
// all the frames before it are empty. In that case, it would
// have been just before this line.
// XXXbz the line box is not fully reflowed yet if our
// containing block is relatively positioned...
if (lineBox != iter.End()) {
nsIFrame* firstFrame = lineBox->mFirstChild;
bool allEmpty = false;
if (firstFrame == aPlaceholderFrame) {
aPlaceholderFrame->SetLineIsEmptySoFar(true);
allEmpty = true;
} else {
auto prev = aPlaceholderFrame->GetPrevSibling();
if (prev && prev->IsPlaceholderFrame()) {
auto ph = static_cast<nsPlaceholderFrame*>(prev);
if (ph->GetLineIsEmptySoFar(&allEmpty)) {
aPlaceholderFrame->SetLineIsEmptySoFar(allEmpty);
}
}
}
if (!allEmpty) {
bool found = false;
while (firstFrame) { // See bug 223064
allEmpty = AreAllEarlierInFlowFramesEmpty(
firstFrame, aPlaceholderFrame, &found);
if (found || !allEmpty) {
break;
}
firstFrame = firstFrame->GetNextSibling();
}
aPlaceholderFrame->SetLineIsEmptySoFar(allEmpty);
}
NS_ASSERTION(firstFrame, "Couldn't find placeholder!");
if (allEmpty) {
// The top of the hypothetical box is the top of the line
// containing the placeholder, since there is nothing in the
// line before our placeholder except empty frames.
aHypotheticalPos.mBStart =
lineBounds.BStart(wm) + blockOffset.B(wm);
} else {
// The top of the hypothetical box is just below the line
// containing the placeholder.
aHypotheticalPos.mBStart = lineBounds.BEnd(wm) + blockOffset.B(wm);
}
} else {
// Just use the placeholder's block-offset wrt the containing block
aHypotheticalPos.mBStart = placeholderOffset.B(wm);
}
}
}
} else {
// The containing block is not a block, so it's probably something
// like a XUL box, etc.
// Just use the placeholder's block-offset
aHypotheticalPos.mBStart = placeholderOffset.B(wm);
}
// Second, determine the hypothetical box's mIStart.
// How we determine the hypothetical box depends on whether the element
// would have been inline-level or block-level
if (mStyleDisplay->IsOriginalDisplayInlineOutside() ||
mFlags.mIOffsetsNeedCSSAlign) {
// The placeholder represents the IStart edge of the hypothetical box.
// (Or if mFlags.mIOffsetsNeedCSSAlign is set, it represents the IStart
// edge of the Alignment Container.)
aHypotheticalPos.mIStart = placeholderOffset.I(wm);
} else {
aHypotheticalPos.mIStart = blockIStartContentEdge;
}
// The current coordinate space is that of the nearest block to the
// placeholder. Convert to the coordinate space of the absolute containing
// block.
nsPoint cbOffset =
containingBlock->GetOffsetToIgnoringScrolling(aCBReflowInput->mFrame);
nsSize reflowSize = aCBReflowInput->ComputedSizeAsContainerIfConstrained();
LogicalPoint logCBOffs(wm, cbOffset, reflowSize - containerSize);
aHypotheticalPos.mIStart += logCBOffs.I(wm);
aHypotheticalPos.mBStart += logCBOffs.B(wm);
// If block direction doesn't match (whether orthogonal or antiparallel),
// we'll have to convert aHypotheticalPos to be in terms of cbwm.
// This upcoming conversion must be taken into account for border offsets.
const bool hypotheticalPosWillUseCbwm =
cbwm.GetBlockDir() != wm.GetBlockDir();
// The specified offsets are relative to the absolute containing block's
// padding edge and our current values are relative to the border edge, so
// translate.
const LogicalMargin border = aCBReflowInput->ComputedLogicalBorder(wm);
if (hypotheticalPosWillUseCbwm && InlinePolarityFlipped(wm, cbwm)) {
aHypotheticalPos.mIStart += border.IEnd(wm);
} else {
aHypotheticalPos.mIStart -= border.IStart(wm);
}
if (hypotheticalPosWillUseCbwm && BlockPolarityFlipped(wm, cbwm)) {
aHypotheticalPos.mBStart += border.BEnd(wm);
} else {
aHypotheticalPos.mBStart -= border.BStart(wm);
}
// At this point, we have computed aHypotheticalPos using the writing mode
// of the placeholder's containing block.
if (hypotheticalPosWillUseCbwm) {
// If the block direction we used in calculating aHypotheticalPos does not
// match the absolute containing block's, we need to convert here so that
// aHypotheticalPos is usable in relation to the absolute containing block.
// This requires computing or measuring the abspos frame's block-size,
// which is not otherwise required/used here (as aHypotheticalPos
// records only the block-start coordinate).
// This is similar to the inline-size calculation for a replaced
// inline-level element or a block-level element (above), except that
// 'auto' sizing is handled differently in the block direction for non-
// replaced elements and replaced elements lacking an intrinsic size.
// Determine the total amount of block direction
// border/padding/margin that the element would have had if it had
// been in the flow. Note that we ignore any 'auto' and 'inherit'
// values.
nscoord insideBoxSizing, outsideBoxSizing;
CalculateBorderPaddingMargin(eLogicalAxisBlock, blockContentSize.BSize(wm),
&insideBoxSizing, &outsideBoxSizing);
nscoord boxBSize;
const auto& styleBSize = mStylePosition->BSize(wm);
if (styleBSize.BehavesLikeInitialValueOnBlockAxis()) {
if (mFlags.mIsReplaced && intrinsicSize) {
// It's a replaced element with an 'auto' block size so the box
// block size is its intrinsic size plus any border/padding/margin
boxBSize = LogicalSize(wm, *intrinsicSize).BSize(wm) +
outsideBoxSizing + insideBoxSizing;
} else {
// XXX Bug 1191801
// Figure out how to get the correct boxBSize here (need to reflow the
// positioned frame?)
boxBSize = 0;
}
} else {
// We need to compute it. It's important we do this, because if it's
// percentage-based this computed value may be different from the
// computed value calculated using the absolute containing block height.
boxBSize = nsLayoutUtils::ComputeBSizeValue(
blockContentSize.BSize(wm), insideBoxSizing,
styleBSize.AsLengthPercentage()) +
insideBoxSizing + outsideBoxSizing;
}
LogicalSize boxSize(wm, boxISize.valueOr(0), boxBSize);
LogicalPoint origin(wm, aHypotheticalPos.mIStart, aHypotheticalPos.mBStart);
origin =
origin.ConvertTo(cbwm, wm, reflowSize - boxSize.GetPhysicalSize(wm));
aHypotheticalPos.mIStart = origin.I(cbwm);
aHypotheticalPos.mBStart = origin.B(cbwm);
aHypotheticalPos.mWritingMode = cbwm;
} else {
aHypotheticalPos.mWritingMode = wm;
}
}
bool ReflowInput::IsInlineSizeComputableByBlockSizeAndAspectRatio(
nscoord aBlockSize) const {
WritingMode wm = GetWritingMode();
MOZ_ASSERT(!mStylePosition->mOffset.GetBStart(wm).IsAuto() &&
!mStylePosition->mOffset.GetBEnd(wm).IsAuto(),
"If any of the block-start and block-end are auto, aBlockSize "
"doesn't make sense");
NS_WARNING_ASSERTION(
aBlockSize >= 0 && aBlockSize != NS_UNCONSTRAINEDSIZE,
"The caller shouldn't give us an unresolved or invalid block size");
if (!mStylePosition->mAspectRatio.HasFiniteRatio()) {
return false;
}
// We don't have to compute the inline size by aspect-ratio and the resolved
// block size (from insets) for replaced elements.
if (mFrame->IsFrameOfType(nsIFrame::eReplaced)) {
return false;
}
// If inline size is specified, we should have it by mFrame->ComputeSize()
// already.
if (mStylePosition->ISize(wm).IsLengthPercentage()) {
return false;
}
// If both inline insets are non-auto, mFrame->ComputeSize() should get a
// possible inline size by those insets, so we don't rely on aspect-ratio.
if (!mStylePosition->mOffset.GetIStart(wm).IsAuto() &&
!mStylePosition->mOffset.GetIEnd(wm).IsAuto()) {
return false;
}
// Just an error handling. If |aBlockSize| is NS_UNCONSTRAINEDSIZE, there must
// be something wrong, and we don't want to continue the calculation for
// aspect-ratio. So we return false if this happens.
return aBlockSize != NS_UNCONSTRAINEDSIZE;
}
// FIXME: Move this into nsIFrame::ComputeSize() if possible, so most of the
// if-checks can be simplier.
LogicalSize ReflowInput::CalculateAbsoluteSizeWithResolvedAutoBlockSize(
nscoord aAutoBSize, const LogicalSize& aTentativeComputedSize) {
LogicalSize resultSize = aTentativeComputedSize;
WritingMode wm = GetWritingMode();
// Two cases we don't want to early return:
// 1. If the block size behaves as initial value and we haven't resolved it in
// ComputeSize() yet, we need to apply |aAutoBSize|.
// Also, we check both computed style and |resultSize.BSize(wm)| to avoid
// applying |aAutoBSize| when the resolved block size is saturated at
// nscoord_MAX, and wrongly treated as NS_UNCONSTRAINEDSIZE because of a
// giant specified block-size.
// 2. If the block size needs to be computed via aspect-ratio and
// |aAutoBSize|, we need to apply |aAutoBSize|. In this case,
// |resultSize.BSize(wm)| may not be NS_UNCONSTRAINEDSIZE because we apply
// aspect-ratio in ComputeSize() for block axis by default, so we have to
// check its computed style.
const bool bSizeBehavesAsInitial =
mStylePosition->BSize(wm).BehavesLikeInitialValueOnBlockAxis();
const bool bSizeIsStillUnconstrained =
bSizeBehavesAsInitial && resultSize.BSize(wm) == NS_UNCONSTRAINEDSIZE;
const bool needsComputeInlineSizeByAspectRatio =
bSizeBehavesAsInitial &&
IsInlineSizeComputableByBlockSizeAndAspectRatio(aAutoBSize);
if (!bSizeIsStillUnconstrained && !needsComputeInlineSizeByAspectRatio) {
return resultSize;
}
// For non-replaced elements with block-size auto, the block-size
// fills the remaining space, and we clamp it by min/max size constraints.
resultSize.BSize(wm) = ApplyMinMaxBSize(aAutoBSize);
if (!needsComputeInlineSizeByAspectRatio) {
return resultSize;
}
// Calculate transferred inline size through aspect-ratio.
// For non-replaced elements, we always take box-sizing into account.
const auto boxSizingAdjust =
mStylePosition->mBoxSizing == StyleBoxSizing::Border
? ComputedLogicalBorderPadding(wm).Size(wm)
: LogicalSize(wm);
auto transferredISize =
mStylePosition->mAspectRatio.ToLayoutRatio().ComputeRatioDependentSize(
LogicalAxis::eLogicalAxisInline, wm, aAutoBSize, boxSizingAdjust);
resultSize.ISize(wm) = ApplyMinMaxISize(transferredISize);
MOZ_ASSERT(mFlags.mIsBSizeSetByAspectRatio,
"This flag should have been set because nsIFrame::ComputeSize() "
"returns AspectRatioUsage::ToComputeBSize unconditionally for "
"auto block-size");
mFlags.mIsBSizeSetByAspectRatio = false;
return resultSize;
}
void ReflowInput::InitAbsoluteConstraints(nsPresContext* aPresContext,
const ReflowInput* aCBReflowInput,
const LogicalSize& aCBSize,
LayoutFrameType aFrameType) {
WritingMode wm = GetWritingMode();
WritingMode cbwm = aCBReflowInput->GetWritingMode();
NS_WARNING_ASSERTION(aCBSize.BSize(cbwm) != NS_UNCONSTRAINEDSIZE,
"containing block bsize must be constrained");
NS_ASSERTION(aFrameType != LayoutFrameType::Table,
"InitAbsoluteConstraints should not be called on table frames");
NS_ASSERTION(mFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW),
"Why are we here?");
const auto& styleOffset = mStylePosition->mOffset;
bool iStartIsAuto = styleOffset.GetIStart(cbwm).IsAuto();
bool iEndIsAuto = styleOffset.GetIEnd(cbwm).IsAuto();
bool bStartIsAuto = styleOffset.GetBStart(cbwm).IsAuto();
bool bEndIsAuto = styleOffset.GetBEnd(cbwm).IsAuto();
// If both 'left' and 'right' are 'auto' or both 'top' and 'bottom' are
// 'auto', then compute the hypothetical box position where the element would
// have been if it had been in the flow
nsHypotheticalPosition hypotheticalPos;
if ((iStartIsAuto && iEndIsAuto) || (bStartIsAuto && bEndIsAuto)) {
nsPlaceholderFrame* placeholderFrame = mFrame->GetPlaceholderFrame();
MOZ_ASSERT(placeholderFrame, "no placeholder frame");
nsIFrame* placeholderParent = placeholderFrame->GetParent();
MOZ_ASSERT(placeholderParent, "shouldn't have unparented placeholders");
if (placeholderFrame->HasAnyStateBits(
PLACEHOLDER_STATICPOS_NEEDS_CSSALIGN)) {
MOZ_ASSERT(placeholderParent->IsFlexOrGridContainer(),
"This flag should only be set on grid/flex children");
// If the (as-yet unknown) static position will determine the inline
// and/or block offsets, set flags to note those offsets aren't valid
// until we can do CSS Box Alignment on the OOF frame.
mFlags.mIOffsetsNeedCSSAlign = (iStartIsAuto && iEndIsAuto);
mFlags.mBOffsetsNeedCSSAlign = (bStartIsAuto && bEndIsAuto);
}
if (mFlags.mStaticPosIsCBOrigin) {
hypotheticalPos.mWritingMode = cbwm;
hypotheticalPos.mIStart = nscoord(0);
hypotheticalPos.mBStart = nscoord(0);
if (placeholderParent->IsGridContainerFrame() &&
placeholderParent->HasAnyStateBits(NS_STATE_GRID_IS_COL_MASONRY |
NS_STATE_GRID_IS_ROW_MASONRY)) {
// Disable CSS alignment in Masonry layout since we don't have real grid
// areas in that axis. We'll use the placeholder position instead as it
// was calculated by nsGridContainerFrame::MasonryLayout.
auto cbsz = aCBSize.GetPhysicalSize(cbwm);
LogicalPoint pos = placeholderFrame->GetLogicalPosition(cbwm, cbsz);
if (placeholderParent->HasAnyStateBits(NS_STATE_GRID_IS_COL_MASONRY)) {
mFlags.mIOffsetsNeedCSSAlign = false;
hypotheticalPos.mIStart = pos.I(cbwm);
} else {
mFlags.mBOffsetsNeedCSSAlign = false;
hypotheticalPos.mBStart = pos.B(cbwm);
}
}
} else {
// XXXmats all this is broken for orthogonal writing-modes: bug 1521988.
CalculateHypotheticalPosition(aPresContext, placeholderFrame,
aCBReflowInput, hypotheticalPos,
aFrameType);
if (aCBReflowInput->mFrame->IsGridContainerFrame()) {
// 'hypotheticalPos' is relative to the padding rect of the CB *frame*.
// In grid layout the CB is the grid area rectangle, so we translate
// 'hypotheticalPos' to be relative that rectangle here.
nsRect cb = nsGridContainerFrame::GridItemCB(mFrame);
nscoord left(0);
nscoord right(0);
if (cbwm.IsBidiLTR()) {
left = cb.X();
} else {
right = aCBReflowInput->ComputedWidth() +
aCBReflowInput->ComputedPhysicalPadding().LeftRight() -
cb.XMost();
}
LogicalMargin offsets(cbwm, nsMargin(cb.Y(), right, nscoord(0), left));
hypotheticalPos.mIStart -= offsets.IStart(cbwm);
hypotheticalPos.mBStart -= offsets.BStart(cbwm);
}
}
}
// Initialize the 'left' and 'right' computed offsets
// XXX Handle new 'static-position' value...
// Size of the containing block in its writing mode
LogicalSize cbSize = aCBSize;
LogicalMargin offsets = ComputedLogicalOffsets(cbwm);
if (iStartIsAuto) {
offsets.IStart(cbwm) = 0;
} else {
offsets.IStart(cbwm) = nsLayoutUtils::ComputeCBDependentValue(
cbSize.ISize(cbwm), styleOffset.GetIStart(cbwm));
}
if (iEndIsAuto) {
offsets.IEnd(cbwm) = 0;
} else {
offsets.IEnd(cbwm) = nsLayoutUtils::ComputeCBDependentValue(
cbSize.ISize(cbwm), styleOffset.GetIEnd(cbwm));
}
if (iStartIsAuto && iEndIsAuto) {
if (cbwm.IsBidiLTR() != hypotheticalPos.mWritingMode.IsBidiLTR()) {
offsets.IEnd(cbwm) = hypotheticalPos.mIStart;
iEndIsAuto = false;
} else {
offsets.IStart(cbwm) = hypotheticalPos.mIStart;
iStartIsAuto = false;
}
}
if (bStartIsAuto) {
offsets.BStart(cbwm) = 0;
} else {
offsets.BStart(cbwm) = nsLayoutUtils::ComputeBSizeDependentValue(
cbSize.BSize(cbwm), styleOffset.GetBStart(cbwm));
}
if (bEndIsAuto) {
offsets.BEnd(cbwm) = 0;
} else {
offsets.BEnd(cbwm) = nsLayoutUtils::ComputeBSizeDependentValue(
cbSize.BSize(cbwm), styleOffset.GetBEnd(cbwm));
}
if (bStartIsAuto && bEndIsAuto) {
// Treat 'top' like 'static-position'
offsets.BStart(cbwm) = hypotheticalPos.mBStart;
bStartIsAuto = false;
}
SetComputedLogicalOffsets(cbwm, offsets);
if (wm.IsOrthogonalTo(cbwm)) {
if (bStartIsAuto || bEndIsAuto) {
mComputeSizeFlags += ComputeSizeFlag::ShrinkWrap;
}
} else {
if (iStartIsAuto || iEndIsAuto) {
mComputeSizeFlags += ComputeSizeFlag::ShrinkWrap;
}
}
nsIFrame::SizeComputationResult sizeResult = {
LogicalSize(wm), nsIFrame::AspectRatioUsage::None};
{
AutoMaybeDisableFontInflation an(mFrame);
sizeResult = mFrame->ComputeSize(
mRenderingContext, wm, cbSize.ConvertTo(wm, cbwm),
cbSize.ConvertTo(wm, cbwm).ISize(wm), // XXX or AvailableISize()?
ComputedLogicalMargin(wm).Size(wm) +
ComputedLogicalOffsets(wm).Size(wm),
ComputedLogicalBorderPadding(wm).Size(wm), {}, mComputeSizeFlags);
mComputedSize = sizeResult.mLogicalSize;
NS_ASSERTION(ComputedISize() >= 0, "Bogus inline-size");
NS_ASSERTION(
ComputedBSize() == NS_UNCONSTRAINEDSIZE || ComputedBSize() >= 0,
"Bogus block-size");
}
LogicalSize& computedSize = sizeResult.mLogicalSize;
computedSize = computedSize.ConvertTo(cbwm, wm);
mFlags.mIsBSizeSetByAspectRatio = sizeResult.mAspectRatioUsage ==
nsIFrame::AspectRatioUsage::ToComputeBSize;
// XXX Now that we have ComputeSize, can we condense many of the
// branches off of widthIsAuto?
LogicalMargin margin = ComputedLogicalMargin(cbwm);
const LogicalMargin borderPadding = ComputedLogicalBorderPadding(cbwm);
bool iSizeIsAuto = mStylePosition->ISize(cbwm).IsAuto();
bool marginIStartIsAuto = false;
bool marginIEndIsAuto = false;
bool marginBStartIsAuto = false;
bool marginBEndIsAuto = false;
if (iStartIsAuto) {
// We know 'right' is not 'auto' anymore thanks to the hypothetical
// box code above.
// Solve for 'left'.
if (iSizeIsAuto) {
// XXXldb This, and the corresponding code in
// nsAbsoluteContainingBlock.cpp, could probably go away now that
// we always compute widths.
offsets.IStart(cbwm) = NS_AUTOOFFSET;
} else {
offsets.IStart(cbwm) = cbSize.ISize(cbwm) - offsets.IEnd(cbwm) -
computedSize.ISize(cbwm) - margin.IStartEnd(cbwm) -
borderPadding.IStartEnd(cbwm);
}
} else if (iEndIsAuto) {
// We know 'left' is not 'auto' anymore thanks to the hypothetical
// box code above.
// Solve for 'right'.
if (iSizeIsAuto) {
// XXXldb This, and the corresponding code in
// nsAbsoluteContainingBlock.cpp, could probably go away now that
// we always compute widths.
offsets.IEnd(cbwm) = NS_AUTOOFFSET;
} else {
offsets.IEnd(cbwm) = cbSize.ISize(cbwm) - offsets.IStart(cbwm) -
computedSize.ISize(cbwm) - margin.IStartEnd(cbwm) -
borderPadding.IStartEnd(cbwm);
}
} else if (!mFrame->HasIntrinsicKeywordForBSize() ||
!wm.IsOrthogonalTo(cbwm)) {
// Neither 'inline-start' nor 'inline-end' is 'auto'.
if (wm.IsOrthogonalTo(cbwm)) {
// For orthogonal blocks, we need to handle the case where the block had
// unconstrained block-size, which mapped to unconstrained inline-size
// in the containing block's writing mode.
nscoord autoISize = cbSize.ISize(cbwm) - margin.IStartEnd(cbwm) -
borderPadding.IStartEnd(cbwm) -
offsets.IStartEnd(cbwm);
autoISize = std::max(autoISize, 0);
// FIXME: Bug 1602669: if |autoISize| happens to be numerically equal to
// NS_UNCONSTRAINEDSIZE, we may get some unexpected behavior. We need a
// better way to distinguish between unconstrained size and resolved
// size.
NS_WARNING_ASSERTION(autoISize != NS_UNCONSTRAINEDSIZE,
"Unexpected size from inline-start and inline-end");
nscoord autoBSizeInWM = autoISize;
LogicalSize computedSizeInWM =
CalculateAbsoluteSizeWithResolvedAutoBlockSize(
autoBSizeInWM, computedSize.ConvertTo(wm, cbwm));
computedSize = computedSizeInWM.ConvertTo(cbwm, wm);
}
// However, the inline-size might
// still not fill all the available space (even though we didn't
// shrink-wrap) in case:
// * inline-size was specified
// * we're dealing with a replaced element
// * width was constrained by min- or max-inline-size.
nscoord availMarginSpace =
aCBSize.ISize(cbwm) - offsets.IStartEnd(cbwm) - margin.IStartEnd(cbwm) -
borderPadding.IStartEnd(cbwm) - computedSize.ISize(cbwm);
marginIStartIsAuto = mStyleMargin->mMargin.GetIStart(cbwm).IsAuto();
marginIEndIsAuto = mStyleMargin->mMargin.GetIEnd(cbwm).IsAuto();
ComputeAbsPosInlineAutoMargin(availMarginSpace, cbwm, marginIStartIsAuto,
marginIEndIsAuto, margin, offsets);
}
bool bSizeIsAuto =
mStylePosition->BSize(cbwm).BehavesLikeInitialValueOnBlockAxis();
if (bStartIsAuto) {
// solve for block-start
if (bSizeIsAuto) {
offsets.BStart(cbwm) = NS_AUTOOFFSET;
} else {
offsets.BStart(cbwm) = cbSize.BSize(cbwm) - margin.BStartEnd(cbwm) -
borderPadding.BStartEnd(cbwm) -
computedSize.BSize(cbwm) - offsets.BEnd(cbwm);
}
} else if (bEndIsAuto) {
// solve for block-end
if (bSizeIsAuto) {
offsets.BEnd(cbwm) = NS_AUTOOFFSET;
} else {
offsets.BEnd(cbwm) = cbSize.BSize(cbwm) - margin.BStartEnd(cbwm) -
borderPadding.BStartEnd(cbwm) -
computedSize.BSize(cbwm) - offsets.BStart(cbwm);
}
} else if (!mFrame->HasIntrinsicKeywordForBSize() ||
wm.IsOrthogonalTo(cbwm)) {
// Neither block-start nor -end is 'auto'.
nscoord autoBSize = cbSize.BSize(cbwm) - margin.BStartEnd(cbwm) -
borderPadding.BStartEnd(cbwm) - offsets.BStartEnd(cbwm);
autoBSize = std::max(autoBSize, 0);
// FIXME: Bug 1602669: if |autoBSize| happens to be numerically equal to
// NS_UNCONSTRAINEDSIZE, we may get some unexpected behavior. We need a
// better way to distinguish between unconstrained size and resolved size.
NS_WARNING_ASSERTION(autoBSize != NS_UNCONSTRAINEDSIZE,
"Unexpected size from block-start and block-end");
// For orthogonal case, the inline size in |wm| should have been handled by
// ComputeSize(). In other words, we only have to apply |autoBSize| to
// the computed size if this value can represent the block size in |wm|.
if (!wm.IsOrthogonalTo(cbwm)) {
// We handle the unconstrained block-size in current block's writing
// mode 'wm'.
LogicalSize computedSizeInWM =
CalculateAbsoluteSizeWithResolvedAutoBlockSize(
autoBSize, computedSize.ConvertTo(wm, cbwm));
computedSize = computedSizeInWM.ConvertTo(cbwm, wm);
}
// The block-size might still not fill all the available space in case:
// * bsize was specified
// * we're dealing with a replaced element
// * bsize was constrained by min- or max-bsize.
nscoord availMarginSpace = autoBSize - computedSize.BSize(cbwm);
marginBStartIsAuto = mStyleMargin->mMargin.GetBStart(cbwm).IsAuto();
marginBEndIsAuto = mStyleMargin->mMargin.GetBEnd(cbwm).IsAuto();
ComputeAbsPosBlockAutoMargin(availMarginSpace, cbwm, marginBStartIsAuto,
marginBEndIsAuto, margin, offsets);
}
mComputedSize = computedSize.ConvertTo(wm, cbwm);
SetComputedLogicalOffsets(cbwm, offsets);
SetComputedLogicalMargin(cbwm, margin);
// If we have auto margins, update our UsedMarginProperty. The property
// will have already been created by InitOffsets if it is needed.
if (marginIStartIsAuto || marginIEndIsAuto || marginBStartIsAuto ||
marginBEndIsAuto) {
nsMargin* propValue = mFrame->GetProperty(nsIFrame::UsedMarginProperty());
MOZ_ASSERT(propValue,
"UsedMarginProperty should have been created "
"by InitOffsets.");
*propValue = margin.GetPhysicalMargin(cbwm);
}
}
// This will not be converted to abstract coordinates because it's only
// used in CalcQuirkContainingBlockHeight
static nscoord GetBlockMarginBorderPadding(const ReflowInput* aReflowInput) {
nscoord result = 0;
if (!aReflowInput) return result;
// zero auto margins
nsMargin margin = aReflowInput->ComputedPhysicalMargin();
if (NS_AUTOMARGIN == margin.top) margin.top = 0;
if (NS_AUTOMARGIN == margin.bottom) margin.bottom = 0;
result += margin.top + margin.bottom;
result += aReflowInput->ComputedPhysicalBorderPadding().top +
aReflowInput->ComputedPhysicalBorderPadding().bottom;
return result;
}
/* Get the height based on the viewport of the containing block specified
* in aReflowInput when the containing block has mComputedHeight ==
* NS_UNCONSTRAINEDSIZE This will walk up the chain of containing blocks looking
* for a computed height until it finds the canvas frame, or it encounters a
* frame that is not a block, area, or scroll frame. This handles compatibility
* with IE (see bug 85016 and bug 219693)
*
* When we encounter scrolledContent block frames, we skip over them,
* since they are guaranteed to not be useful for computing the containing
* block.
*
* See also IsQuirkContainingBlockHeight.
*/
static nscoord CalcQuirkContainingBlockHeight(
const ReflowInput* aCBReflowInput) {
const ReflowInput* firstAncestorRI = nullptr; // a candidate for html frame
const ReflowInput* secondAncestorRI = nullptr; // a candidate for body frame
// initialize the default to NS_UNCONSTRAINEDSIZE as this is the containings
// block computed height when this function is called. It is possible that we
// don't alter this height especially if we are restricted to one level
nscoord result = NS_UNCONSTRAINEDSIZE;
const ReflowInput* ri = aCBReflowInput;
for (; ri; ri = ri->mParentReflowInput) {
LayoutFrameType frameType = ri->mFrame->Type();
// if the ancestor is auto height then skip it and continue up if it
// is the first block frame and possibly the body/html
if (LayoutFrameType::Block == frameType ||
LayoutFrameType::Scroll == frameType) {
secondAncestorRI = firstAncestorRI;
firstAncestorRI = ri;
// If the current frame we're looking at is positioned, we don't want to
// go any further (see bug 221784). The behavior we want here is: 1) If
// not auto-height, use this as the percentage base. 2) If auto-height,
// keep looking, unless the frame is positioned.
if (NS_UNCONSTRAINEDSIZE == ri->ComputedHeight()) {
if (ri->mFrame->IsAbsolutelyPositioned(ri->mStyleDisplay)) {
break;
} else {
continue;
}
}
} else if (LayoutFrameType::Canvas == frameType) {
// Always continue on to the height calculation
} else if (LayoutFrameType::PageContent == frameType) {
nsIFrame* prevInFlow = ri->mFrame->GetPrevInFlow();
// only use the page content frame for a height basis if it is the first
// in flow
if (prevInFlow) break;
} else {
break;
}
// if the ancestor is the page content frame then the percent base is
// the avail height, otherwise it is the computed height
result = (LayoutFrameType::PageContent == frameType) ? ri->AvailableHeight()
: ri->ComputedHeight();
// if unconstrained - don't sutract borders - would result in huge height
if (NS_UNCONSTRAINEDSIZE == result) return result;
// if we got to the canvas or page content frame, then subtract out
// margin/border/padding for the BODY and HTML elements
if ((LayoutFrameType::Canvas == frameType) ||
(LayoutFrameType::PageContent == frameType)) {
result -= GetBlockMarginBorderPadding(firstAncestorRI);
result -= GetBlockMarginBorderPadding(secondAncestorRI);
#ifdef DEBUG
// make sure the first ancestor is the HTML and the second is the BODY
if (firstAncestorRI) {
nsIContent* frameContent = firstAncestorRI->mFrame->GetContent();
if (frameContent) {
NS_ASSERTION(frameContent->IsHTMLElement(nsGkAtoms::html),
"First ancestor is not HTML");
}
}
if (secondAncestorRI) {
nsIContent* frameContent = secondAncestorRI->mFrame->GetContent();
if (frameContent) {
NS_ASSERTION(frameContent->IsHTMLElement(nsGkAtoms::body),
"Second ancestor is not BODY");
}
}
#endif
}
// if we got to the html frame (a block child of the canvas) ...
else if (LayoutFrameType::Block == frameType && ri->mParentReflowInput &&
ri->mParentReflowInput->mFrame->IsCanvasFrame()) {
// ... then subtract out margin/border/padding for the BODY element
result -= GetBlockMarginBorderPadding(secondAncestorRI);
}
break;
}
// Make sure not to return a negative height here!
return std::max(result, 0);
}
// Called by InitConstraints() to compute the containing block rectangle for
// the element. Handles the special logic for absolutely positioned elements
LogicalSize ReflowInput::ComputeContainingBlockRectangle(
nsPresContext* aPresContext, const ReflowInput* aContainingBlockRI) const {
// Unless the element is absolutely positioned, the containing block is
// formed by the content edge of the nearest block-level ancestor
LogicalSize cbSize = aContainingBlockRI->ComputedSize();
WritingMode wm = aContainingBlockRI->GetWritingMode();
if (aContainingBlockRI->mFlags.mTreatBSizeAsIndefinite) {
cbSize.BSize(wm) = NS_UNCONSTRAINEDSIZE;
}
if (((mFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) &&
// XXXfr hack for making frames behave properly when in overflow
// container lists, see bug 154892; need to revisit later
!mFrame->GetPrevInFlow()) ||
(mFrame->IsTableFrame() &&
mFrame->GetParent()->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW))) &&
mStyleDisplay->IsAbsolutelyPositioned(mFrame)) {
// See if the ancestor is block-level or inline-level
const auto computedPadding = aContainingBlockRI->ComputedLogicalPadding(wm);
if (aContainingBlockRI->mStyleDisplay->IsInlineOutsideStyle()) {
// Base our size on the actual size of the frame. In cases when this is
// completely bogus (eg initial reflow), this code shouldn't even be
// called, since the code in nsInlineFrame::Reflow will pass in
// the containing block dimensions to our constructor.
// XXXbz we should be taking the in-flows into account too, but
// that's very hard.
LogicalMargin computedBorder =
aContainingBlockRI->ComputedLogicalBorderPadding(wm) -
computedPadding;
cbSize.ISize(wm) =
aContainingBlockRI->mFrame->ISize(wm) - computedBorder.IStartEnd(wm);
NS_ASSERTION(cbSize.ISize(wm) >= 0, "Negative containing block isize!");
cbSize.BSize(wm) =
aContainingBlockRI->mFrame->BSize(wm) - computedBorder.BStartEnd(wm);
NS_ASSERTION(cbSize.BSize(wm) >= 0, "Negative containing block bsize!");
} else {
// If the ancestor is block-level, the containing block is formed by the
// padding edge of the ancestor
cbSize += computedPadding.Size(wm);
}
} else {
auto IsQuirky = [](const StyleSize& aSize) -> bool {
return aSize.ConvertsToPercentage();
};
// an element in quirks mode gets a containing block based on looking for a
// parent with a non-auto height if the element has a percent height.
// Note: We don't emulate this quirk for percents in calc(), or in vertical
// writing modes, or if the containing block is a flex or grid item.
if (!wm.IsVertical() && NS_UNCONSTRAINEDSIZE == cbSize.BSize(wm)) {
if (eCompatibility_NavQuirks == aPresContext->CompatibilityMode() &&
!aContainingBlockRI->mFrame->IsFlexOrGridItem() &&
(IsQuirky(mStylePosition->mHeight) ||
(mFrame->IsTableWrapperFrame() &&
IsQuirky(mFrame->PrincipalChildList()
.FirstChild()
->StylePosition()
->mHeight)))) {
cbSize.BSize(wm) = CalcQuirkContainingBlockHeight(aContainingBlockRI);
}
}
}
return cbSize.ConvertTo(GetWritingMode(), wm);
}
// XXX refactor this code to have methods for each set of properties
// we are computing: width,height,line-height; margin; offsets
void ReflowInput::InitConstraints(
nsPresContext* aPresContext, const Maybe<LogicalSize>& aContainingBlockSize,
const Maybe<LogicalMargin>& aBorder, const Maybe<LogicalMargin>& aPadding,
LayoutFrameType aFrameType) {
MOZ_ASSERT(!mStyleDisplay->IsFloating(mFrame) ||
(mStyleDisplay->mDisplay != StyleDisplay::MozBox &&
mStyleDisplay->mDisplay != StyleDisplay::MozInlineBox),
"Please don't try to float a -moz-box or a -moz-inline-box");
WritingMode wm = GetWritingMode();
LogicalSize cbSize = aContainingBlockSize.valueOr(
LogicalSize(mWritingMode, NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE));
DISPLAY_INIT_CONSTRAINTS(mFrame, this, cbSize.ISize(wm), cbSize.BSize(wm),
aBorder, aPadding);
// If this is a reflow root, then set the computed width and
// height equal to the available space
if (nullptr == mParentReflowInput || mFlags.mDummyParentReflowInput) {
// XXXldb This doesn't mean what it used to!
InitOffsets(wm, cbSize.ISize(wm), aFrameType, mComputeSizeFlags, aBorder,
aPadding, mStyleDisplay);
// Override mComputedMargin since reflow roots start from the
// frame's boundary, which is inside the margin.
SetComputedLogicalMargin(wm, LogicalMargin(wm));
SetComputedLogicalOffsets(wm, LogicalMargin(wm));
const auto borderPadding = ComputedLogicalBorderPadding(wm);
SetComputedISize(
std::max(0, AvailableISize() - borderPadding.IStartEnd(wm)),
ResetResizeFlags::No);
SetComputedBSize(
AvailableBSize() != NS_UNCONSTRAINEDSIZE
? std::max(0, AvailableBSize() - borderPadding.BStartEnd(wm))
: NS_UNCONSTRAINEDSIZE,
ResetResizeFlags::No);
mComputedMinSize.SizeTo(mWritingMode, 0, 0);
mComputedMaxSize.SizeTo(mWritingMode, NS_UNCONSTRAINEDSIZE,
NS_UNCONSTRAINEDSIZE);
} else {
// Get the containing block's reflow input
const ReflowInput* cbri = mCBReflowInput;
MOZ_ASSERT(cbri, "no containing block");
MOZ_ASSERT(mFrame->GetParent());
// If we weren't given a containing block size, then compute one.
if (aContainingBlockSize.isNothing()) {
cbSize = ComputeContainingBlockRectangle(aPresContext, cbri);
}
// See if the containing block height is based on the size of its
// content
if (NS_UNCONSTRAINEDSIZE == cbSize.BSize(wm)) {
// See if the containing block is a cell frame which needs
// to use the mComputedHeight of the cell instead of what the cell block
// passed in.
// XXX It seems like this could lead to bugs with min-height and friends
if (cbri->mParentReflowInput && cbri->mFrame->IsTableCellFrame()) {
cbSize.BSize(wm) = cbri->ComputedSize(wm).BSize(wm);
}
}
// XXX Might need to also pass the CB height (not width) for page boxes,
// too, if we implement them.
// For calculating positioning offsets, margins, borders and
// padding, we use the writing mode of the containing block
WritingMode cbwm = cbri->GetWritingMode();
InitOffsets(cbwm, cbSize.ConvertTo(cbwm, wm).ISize(cbwm), aFrameType,
mComputeSizeFlags, aBorder, aPadding, mStyleDisplay);
// For calculating the size of this box, we use its own writing mode
const auto& blockSize = mStylePosition->BSize(wm);
bool isAutoBSize = blockSize.BehavesLikeInitialValueOnBlockAxis();
// Check for a percentage based block size and a containing block
// block size that depends on the content block size
if (blockSize.HasPercent()) {
if (NS_UNCONSTRAINEDSIZE == cbSize.BSize(wm)) {
// this if clause enables %-blockSize on replaced inline frames,
// such as images. See bug 54119. The else clause "blockSizeUnit =
// eStyleUnit_Auto;" used to be called exclusively.
if (mFlags.mIsReplaced && mStyleDisplay->IsInlineOutsideStyle()) {
// Get the containing block's reflow input
NS_ASSERTION(nullptr != cbri, "no containing block");
// in quirks mode, get the cb height using the special quirk method
if (!wm.IsVertical() &&
eCompatibility_NavQuirks == aPresContext->CompatibilityMode()) {
if (!cbri->mFrame->IsTableCellFrame() &&
!cbri->mFrame->IsFlexOrGridItem()) {
cbSize.BSize(wm) = CalcQuirkContainingBlockHeight(cbri);
if (cbSize.BSize(wm) == NS_UNCONSTRAINEDSIZE) {
isAutoBSize = true;
}
} else {
isAutoBSize = true;
}
}
// in standard mode, use the cb block size. if it's "auto",
// as will be the case by default in BODY, use auto block size
// as per CSS2 spec.
else {
nscoord computedBSize = cbri->ComputedSize(wm).BSize(wm);
if (NS_UNCONSTRAINEDSIZE != computedBSize) {
cbSize.BSize(wm) = computedBSize;
} else {
isAutoBSize = true;
}
}
} else {
// default to interpreting the blockSize like 'auto'
isAutoBSize = true;
}
}
}
// Compute our offsets if the element is relatively positioned. We
// need the correct containing block inline-size and block-size
// here, which is why we need to do it after all the quirks-n-such
// above. (If the element is sticky positioned, we need to wait
// until the scroll container knows its size, so we compute offsets
// from StickyScrollContainer::UpdatePositions.)
if (mStyleDisplay->IsRelativelyPositioned(mFrame)) {
const LogicalMargin offsets =
ComputeRelativeOffsets(cbwm, mFrame, cbSize.ConvertTo(cbwm, wm));
SetComputedLogicalOffsets(cbwm, offsets);
} else {
// Initialize offsets to 0
SetComputedLogicalOffsets(wm, LogicalMargin(wm));
}
// Calculate the computed values for min and max properties. Note that
// this MUST come after we've computed our border and padding.
ComputeMinMaxValues(cbSize);
// Calculate the computed inlineSize and blockSize.
// This varies by frame type.
if (IsInternalTableFrame()) {
// Internal table elements. The rules vary depending on the type.
// Calculate the computed isize
bool rowOrRowGroup = false;
const auto& inlineSize = mStylePosition->ISize(wm);
bool isAutoISize = inlineSize.IsAuto();
if ((StyleDisplay::TableRow == mStyleDisplay->mDisplay) ||
(StyleDisplay::TableRowGroup == mStyleDisplay->mDisplay)) {
// 'inlineSize' property doesn't apply to table rows and row groups
isAutoISize = true;
rowOrRowGroup = true;
}
// calc() with both percentages and lengths act like auto on internal
// table elements
if (isAutoISize || inlineSize.HasLengthAndPercentage()) {
if (AvailableISize() != NS_UNCONSTRAINEDSIZE && !rowOrRowGroup) {
// Internal table elements don't have margins. Only tables and
// cells have border and padding
SetComputedISize(
std::max(0, AvailableISize() -
ComputedLogicalBorderPadding(wm).IStartEnd(wm)),
ResetResizeFlags::No);
} else {
SetComputedISize(AvailableISize(), ResetResizeFlags::No);
}
NS_ASSERTION(ComputedISize() >= 0, "Bogus computed isize");
} else {
SetComputedISize(
ComputeISizeValue(cbSize, mStylePosition->mBoxSizing, inlineSize),
ResetResizeFlags::No);
}
// Calculate the computed block size
if (StyleDisplay::TableColumn == mStyleDisplay->mDisplay ||
StyleDisplay::TableColumnGroup == mStyleDisplay->mDisplay) {
// 'blockSize' property doesn't apply to table columns and column groups
isAutoBSize = true;
}
// calc() with both percentages and lengths acts like 'auto' on internal
// table elements
if (isAutoBSize || blockSize.HasLengthAndPercentage()) {
SetComputedBSize(NS_UNCONSTRAINEDSIZE, ResetResizeFlags::No);
} else {
SetComputedBSize(
ComputeBSizeValue(cbSize.BSize(wm), mStylePosition->mBoxSizing,
blockSize.AsLengthPercentage()),
ResetResizeFlags::No);
}
// Doesn't apply to internal table elements
mComputedMinSize.SizeTo(mWritingMode, 0, 0);
mComputedMaxSize.SizeTo(mWritingMode, NS_UNCONSTRAINEDSIZE,
NS_UNCONSTRAINEDSIZE);
} else if (mFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) &&
mStyleDisplay->IsAbsolutelyPositionedStyle() &&
// XXXfr hack for making frames behave properly when in overflow
// container lists, see bug 154892; need to revisit later
!mFrame->GetPrevInFlow()) {
InitAbsoluteConstraints(aPresContext, cbri,
cbSize.ConvertTo(cbri->GetWritingMode(), wm),
aFrameType);
} else {
AutoMaybeDisableFontInflation an(mFrame);
const bool isBlockLevel =
((!mStyleDisplay->IsInlineOutsideStyle() &&
// internal table values on replaced elements behaves as inline
// https://drafts.csswg.org/css-tables-3/#table-structure
// "... it is handled instead as though the author had declared
// either 'block' (for 'table' display) or 'inline' (for all
// other values)"
!(mFlags.mIsReplaced && (mStyleDisplay->IsInnerTableStyle() ||
mStyleDisplay->DisplayOutside() ==
StyleDisplayOutside::TableCaption))) ||
// The inner table frame always fills its outer wrapper table frame,
// even for 'inline-table'.
mFrame->IsTableFrame()) &&
// XXX abs.pos. continuations treated like blocks, see comment in
// the else-if condition above.
(!mFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) ||
mStyleDisplay->IsAbsolutelyPositionedStyle());
if (!isBlockLevel) {
mComputeSizeFlags += ComputeSizeFlag::ShrinkWrap;
}
nsIFrame* alignCB = mFrame->GetParent();
if (alignCB->IsTableWrapperFrame() && alignCB->GetParent()) {
// XXX grid-specific for now; maybe remove this check after we address
// bug 799725
if (alignCB->GetParent()->IsGridContainerFrame()) {
alignCB = alignCB->GetParent();
}
}
if (alignCB->IsGridContainerFrame()) {
// Shrink-wrap grid items that will be aligned (rather than stretched)
// in its inline axis.
auto inlineAxisAlignment =
wm.IsOrthogonalTo(cbwm)
? mStylePosition->UsedAlignSelf(alignCB->Style())._0
: mStylePosition->UsedJustifySelf(alignCB->Style())._0;
if ((inlineAxisAlignment != StyleAlignFlags::STRETCH &&
inlineAxisAlignment != StyleAlignFlags::NORMAL) ||
mStyleMargin->mMargin.GetIStart(wm).IsAuto() ||
mStyleMargin->mMargin.GetIEnd(wm).IsAuto()) {
mComputeSizeFlags += ComputeSizeFlag::ShrinkWrap;
}
} else {
// Shrink-wrap blocks that are orthogonal to their container.
if (isBlockLevel && mCBReflowInput &&
mCBReflowInput->GetWritingMode().IsOrthogonalTo(mWritingMode)) {
mComputeSizeFlags += ComputeSizeFlag::ShrinkWrap;
}
if (alignCB->IsFlexContainerFrame()) {
mComputeSizeFlags += ComputeSizeFlag::ShrinkWrap;
}
}
if (cbSize.ISize(wm) == NS_UNCONSTRAINEDSIZE) {
// For orthogonal flows, where we found a parent orthogonal-limit
// for AvailableISize() in Init(), we'll use the same here as well.
cbSize.ISize(wm) = AvailableISize();
}
auto size =
mFrame->ComputeSize(mRenderingContext, wm, cbSize, AvailableISize(),
ComputedLogicalMargin(wm).Size(wm),
ComputedLogicalBorderPadding(wm).Size(wm),
mStyleSizeOverrides, mComputeSizeFlags);
mComputedSize = size.mLogicalSize;
NS_ASSERTION(ComputedISize() >= 0, "Bogus inline-size");
NS_ASSERTION(
ComputedBSize() == NS_UNCONSTRAINEDSIZE || ComputedBSize() >= 0,
"Bogus block-size");
mFlags.mIsBSizeSetByAspectRatio =
size.mAspectRatioUsage == nsIFrame::AspectRatioUsage::ToComputeBSize;
const bool shouldCalculateBlockSideMargins = [&]() {
if (!isBlockLevel) {
return false;
}
if (mStyleDisplay->mDisplay == StyleDisplay::InlineTable) {
return false;
}
if (mFrame->IsTableFrame()) {
return false;
}
if (alignCB->IsFlexOrGridContainer()) {
// Exclude flex and grid items.
return false;
}
const auto pseudoType = mFrame->Style()->GetPseudoType();
if (pseudoType == PseudoStyleType::marker &&
mFrame->GetParent()->StyleList()->mListStylePosition ==
StyleListStylePosition::Outside) {
// Exclude outside ::markers.
return false;
}
if (pseudoType == PseudoStyleType::columnContent) {
// Exclude -moz-column-content since it cannot have any margin.
return false;
}
return true;
}();
if (shouldCalculateBlockSideMargins) {
CalculateBlockSideMargins();
}
}
}
// Save our containing block dimensions
mContainingBlockSize = cbSize;
}
static void UpdateProp(nsIFrame* aFrame,
const FramePropertyDescriptor<nsMargin>* aProperty,
bool aNeeded, const nsMargin& aNewValue) {
if (aNeeded) {
nsMargin* propValue = aFrame->GetProperty(aProperty);
if (propValue) {
*propValue = aNewValue;
} else {
aFrame->AddProperty(aProperty, new nsMargin(aNewValue));
}
} else {
aFrame->RemoveProperty(aProperty);
}
}
void SizeComputationInput::InitOffsets(WritingMode aCBWM, nscoord aPercentBasis,
LayoutFrameType aFrameType,
ComputeSizeFlags aFlags,
const Maybe<LogicalMargin>& aBorder,
const Maybe<LogicalMargin>& aPadding,
const nsStyleDisplay* aDisplay) {
DISPLAY_INIT_OFFSETS(mFrame, this, aPercentBasis, aCBWM, aBorder, aPadding);
// Since we are in reflow, we don't need to store these properties anymore
// unless they are dependent on width, in which case we store the new value.
nsPresContext* presContext = mFrame->PresContext();
mFrame->RemoveProperty(nsIFrame::UsedBorderProperty());
// Compute margins from the specified margin style information. These
// become the default computed values, and may be adjusted below
// XXX fix to provide 0,0 for the top&bottom margins for
// inline-non-replaced elements
bool needMarginProp = ComputeMargin(aCBWM, aPercentBasis, aFrameType);
// Note that ComputeMargin() simplistically resolves 'auto' margins to 0.
// In formatting contexts where this isn't correct, some later code will
// need to update the UsedMargin() property with the actual resolved value.
// One example of this is ::CalculateBlockSideMargins().
::UpdateProp(mFrame, nsIFrame::UsedMarginProperty(), needMarginProp,
ComputedPhysicalMargin());
const WritingMode wm = GetWritingMode();
const nsStyleDisplay* disp = mFrame->StyleDisplayWithOptionalParam(aDisplay);
bool needPaddingProp;
LayoutDeviceIntMargin widgetPadding;
if (mIsThemed && presContext->Theme()->GetWidgetPadding(
presContext->DeviceContext(), mFrame,
disp->EffectiveAppearance(), &widgetPadding)) {
const nsMargin padding = LayoutDevicePixel::ToAppUnits(
widgetPadding, presContext->AppUnitsPerDevPixel());
SetComputedLogicalPadding(wm, LogicalMargin(wm, padding));
needPaddingProp = false;
} else if (SVGUtils::IsInSVGTextSubtree(mFrame)) {
SetComputedLogicalPadding(wm, LogicalMargin(wm));
needPaddingProp = false;
} else if (aPadding) { // padding is an input arg
SetComputedLogicalPadding(wm, *aPadding);
nsMargin stylePadding;
// If the caller passes a padding that doesn't match our style (like
// nsTextControlFrame might due due to theming), then we also need a
// padding prop.
needPaddingProp = !mFrame->StylePadding()->GetPadding(stylePadding) ||
aPadding->GetPhysicalMargin(wm) != stylePadding;
} else {
needPaddingProp = ComputePadding(aCBWM, aPercentBasis, aFrameType);
}
// Add [align|justify]-content:baseline padding contribution.
typedef const FramePropertyDescriptor<SmallValueHolder<nscoord>>* Prop;
auto ApplyBaselinePadding = [this, wm, &needPaddingProp](LogicalAxis aAxis,
Prop aProp) {
bool found;
nscoord val = mFrame->GetProperty(aProp, &found);
if (found) {
NS_ASSERTION(val != nscoord(0), "zero in this property is useless");
LogicalSide side;
if (val > 0) {
side = MakeLogicalSide(aAxis, eLogicalEdgeStart);
} else {
side = MakeLogicalSide(aAxis, eLogicalEdgeEnd);
val = -val;
}
mComputedPadding.Side(side, wm) += val;
needPaddingProp = true;
if (aAxis == eLogicalAxisBlock && val > 0) {
// We have a baseline-adjusted block-axis start padding, so
// we need this to mark lines dirty when mIsBResize is true:
this->mFrame->AddStateBits(NS_FRAME_CONTAINS_RELATIVE_BSIZE);
}
}
};
if (!aFlags.contains(ComputeSizeFlag::IsGridMeasuringReflow)) {
ApplyBaselinePadding(eLogicalAxisBlock, nsIFrame::BBaselinePadProperty());
}
if (!aFlags.contains(ComputeSizeFlag::ShrinkWrap)) {
ApplyBaselinePadding(eLogicalAxisInline, nsIFrame::IBaselinePadProperty());
}
LogicalMargin border(wm);
if (mIsThemed) {
const LayoutDeviceIntMargin widgetBorder =
presContext->Theme()->GetWidgetBorder(
presContext->DeviceContext(), mFrame, disp->EffectiveAppearance());
border = LogicalMargin(
wm, LayoutDevicePixel::ToAppUnits(widgetBorder,
presContext->AppUnitsPerDevPixel()));
} else if (SVGUtils::IsInSVGTextSubtree(mFrame)) {
// Do nothing since the border local variable is initialized all zero.
} else if (aBorder) { // border is an input arg
border = *aBorder;
} else {
border = LogicalMargin(wm, mFrame->StyleBorder()->GetComputedBorder());
}
SetComputedLogicalBorderPadding(wm, border + ComputedLogicalPadding(wm));
if (aFrameType == LayoutFrameType::Scrollbar) {
// scrollbars may have had their width or height smashed to zero
// by the associated scrollframe, in which case we must not report
// any padding or border.
nsSize size(mFrame->GetSize());
if (size.width == 0 || size.height == 0) {
SetComputedLogicalPadding(wm, LogicalMargin(wm));
SetComputedLogicalBorderPadding(wm, LogicalMargin(wm));
}
}
bool hasPaddingChange;
if (nsMargin* oldPadding =
mFrame->GetProperty(nsIFrame::UsedPaddingProperty())) {
// Note: If a padding change is already detectable without resolving the
// percentage, e.g. a padding is changing from 50px to 50%,
// nsIFrame::DidSetComputedStyle() will cache the old padding in
// UsedPaddingProperty().
hasPaddingChange = *oldPadding != ComputedPhysicalPadding();
} else {
// Our padding may have changed, but we can't tell at this point.
hasPaddingChange = needPaddingProp;
}
// Keep mHasPaddingChange bit set until we've done reflow. We'll clear it in
// nsIFrame::DidReflow()
mFrame->SetHasPaddingChange(mFrame->HasPaddingChange() || hasPaddingChange);
::UpdateProp(mFrame, nsIFrame::UsedPaddingProperty(), needPaddingProp,
ComputedPhysicalPadding());
}
// This code enforces section 10.3.3 of the CSS2 spec for this formula:
//
// 'margin-left' + 'border-left-width' + 'padding-left' + 'width' +
// 'padding-right' + 'border-right-width' + 'margin-right'
// = width of containing block
//
// Note: the width unit is not auto when this is called
void ReflowInput::CalculateBlockSideMargins() {
MOZ_ASSERT(!mFrame->IsTableFrame(),
"Inner table frame cannot have computed margins!");
// Calculations here are done in the containing block's writing mode,
// which is where margins will eventually be applied: we're calculating
// margins that will be used by the container in its inline direction,
// which in the case of an orthogonal contained block will correspond to
// the block direction of this reflow input. So in the orthogonal-flow
// case, "CalculateBlock*Side*Margins" will actually end up adjusting
// the BStart/BEnd margins; those are the "sides" of the block from its
// container's point of view.
WritingMode cbWM =
mCBReflowInput ? mCBReflowInput->GetWritingMode() : GetWritingMode();
nscoord availISizeCBWM = AvailableSize(cbWM).ISize(cbWM);
nscoord computedISizeCBWM = ComputedSize(cbWM).ISize(cbWM);
if (computedISizeCBWM == NS_UNCONSTRAINEDSIZE) {
// For orthogonal flows, where we found a parent orthogonal-limit
// for AvailableISize() in Init(), we don't have meaningful sizes to
// adjust. Act like the sum is already correct (below).
return;
}
LAYOUT_WARN_IF_FALSE(NS_UNCONSTRAINEDSIZE != computedISizeCBWM &&
NS_UNCONSTRAINEDSIZE != availISizeCBWM,
"have unconstrained inline-size; this should only "
"result from very large sizes, not attempts at "
"intrinsic inline-size calculation");
LogicalMargin margin = ComputedLogicalMargin(cbWM);
LogicalMargin borderPadding = ComputedLogicalBorderPadding(cbWM);
nscoord sum = margin.IStartEnd(cbWM) + borderPadding.IStartEnd(cbWM) +
computedISizeCBWM;
if (sum == availISizeCBWM) {
// The sum is already correct
return;
}
// Determine the start and end margin values. The isize value
// remains constant while we do this.
// Calculate how much space is available for margins
nscoord availMarginSpace = availISizeCBWM - sum;
// If the available margin space is negative, then don't follow the
// usual overconstraint rules.
if (availMarginSpace < 0) {
margin.IEnd(cbWM) += availMarginSpace;
SetComputedLogicalMargin(cbWM, margin);
return;
}
// The css2 spec clearly defines how block elements should behave
// in section 10.3.3.
const auto& styleSides = mStyleMargin->mMargin;
bool isAutoStartMargin = styleSides.GetIStart(cbWM).IsAuto();
bool isAutoEndMargin = styleSides.GetIEnd(cbWM).IsAuto();
if (!isAutoStartMargin && !isAutoEndMargin) {
// Neither margin is 'auto' so we're over constrained. Use the
// 'direction' property of the parent to tell which margin to
// ignore
// First check if there is an HTML alignment that we should honor
const StyleTextAlign* textAlign =
mParentReflowInput
? &mParentReflowInput->mFrame->StyleText()->mTextAlign
: nullptr;
if (textAlign && (*textAlign == StyleTextAlign::MozLeft ||
*textAlign == StyleTextAlign::MozCenter ||
*textAlign == StyleTextAlign::MozRight)) {
if (mParentReflowInput->mWritingMode.IsBidiLTR()) {
isAutoStartMargin = *textAlign != StyleTextAlign::MozLeft;
isAutoEndMargin = *textAlign != StyleTextAlign::MozRight;
} else {
isAutoStartMargin = *textAlign != StyleTextAlign::MozRight;
isAutoEndMargin = *textAlign != StyleTextAlign::MozLeft;
}
}
// Otherwise apply the CSS rules, and ignore one margin by forcing
// it to 'auto', depending on 'direction'.
else {
isAutoEndMargin = true;
}
}
// Logic which is common to blocks and tables
// The computed margins need not be zero because the 'auto' could come from
// overconstraint or from HTML alignment so values need to be accumulated
if (isAutoStartMargin) {
if (isAutoEndMargin) {
// Both margins are 'auto' so the computed addition should be equal
nscoord forStart = availMarginSpace / 2;
margin.IStart(cbWM) += forStart;
margin.IEnd(cbWM) += availMarginSpace - forStart;
} else {
margin.IStart(cbWM) += availMarginSpace;
}
} else if (isAutoEndMargin) {
margin.IEnd(cbWM) += availMarginSpace;
}
SetComputedLogicalMargin(cbWM, margin);
if (isAutoStartMargin || isAutoEndMargin) {
// Update the UsedMargin property if we were tracking it already.
nsMargin* propValue = mFrame->GetProperty(nsIFrame::UsedMarginProperty());
if (propValue) {
*propValue = margin.GetPhysicalMargin(cbWM);
}
}
}
// For "normal" we use the font's normal line height (em height + leading).
// If both internal leading and external leading specified by font itself are
// zeros, we should compensate this by creating extra (external) leading.
// This is necessary because without this compensation, normal line height might
// look too tight.
constexpr float kNormalLineHeightFactor = 1.2f;
static nscoord GetNormalLineHeight(nsFontMetrics* aFontMetrics) {
MOZ_ASSERT(aFontMetrics, "no font metrics");
nscoord externalLeading = aFontMetrics->ExternalLeading();
nscoord internalLeading = aFontMetrics->InternalLeading();
nscoord emHeight = aFontMetrics->EmHeight();
if (!internalLeading && !externalLeading) {
return NSToCoordRound(emHeight * kNormalLineHeightFactor);
}
return emHeight + internalLeading + externalLeading;
}
static inline nscoord ComputeLineHeight(const StyleLineHeight& aLh,
const nsStyleFont& aRelativeToFont,
nsPresContext* aPresContext,
bool aIsVertical, nscoord aBlockBSize,
float aFontSizeInflation) {
if (aLh.IsLength()) {
nscoord result = aLh.AsLength().ToAppUnits();
if (aFontSizeInflation != 1.0f) {
result = NSToCoordRound(result * aFontSizeInflation);
}
return result;
}
if (aLh.IsNumber()) {
// For factor units the computed value of the line-height property
// is found by multiplying the factor by the font's computed size
// (adjusted for min-size prefs and text zoom).
return aRelativeToFont.mFont.size
.ScaledBy(aLh.AsNumber() * aFontSizeInflation)
.ToAppUnits();
}
MOZ_ASSERT(aLh.IsNormal() || aLh.IsMozBlockHeight());
if (aLh.IsMozBlockHeight() && aBlockBSize != NS_UNCONSTRAINEDSIZE) {
return aBlockBSize;
}
auto size = aRelativeToFont.mFont.size;
size.ScaleBy(aFontSizeInflation);
if (aPresContext) {
RefPtr<nsFontMetrics> fm = nsLayoutUtils::GetMetricsFor(
aPresContext, aIsVertical, &aRelativeToFont, size,
/* aUseUserFontSet = */ true);
return GetNormalLineHeight(fm);
}
// If we don't have a pres context, use a 1.2em fallback.
size.ScaleBy(kNormalLineHeightFactor);
return size.ToAppUnits();
}
nscoord ReflowInput::GetLineHeight() const {
if (mLineHeight != NS_UNCONSTRAINEDSIZE) {
return mLineHeight;
}
nscoord blockBSize = nsLayoutUtils::IsNonWrapperBlock(mFrame)
? ComputedBSize()
: (mCBReflowInput ? mCBReflowInput->ComputedBSize()
: NS_UNCONSTRAINEDSIZE);
mLineHeight = CalcLineHeight(*mFrame->Style(), mFrame->PresContext(),
mFrame->GetContent(), blockBSize,
nsLayoutUtils::FontSizeInflationFor(mFrame));
return mLineHeight;
}
void ReflowInput::SetLineHeight(nscoord aLineHeight) {
MOZ_ASSERT(aLineHeight >= 0, "aLineHeight must be >= 0!");
if (mLineHeight != aLineHeight) {
mLineHeight = aLineHeight;
// Setting used line height can change a frame's block-size if mFrame's
// block-size behaves as auto.
InitResizeFlags(mFrame->PresContext(), mFrame->Type());
}
}
/* static */
nscoord ReflowInput::CalcLineHeight(const ComputedStyle& aStyle,
nsPresContext* aPresContext,
const nsIContent* aContent,
nscoord aBlockBSize,
float aFontSizeInflation) {
const StyleLineHeight& lh = aStyle.StyleText()->mLineHeight;
WritingMode wm(&aStyle);
const bool vertical = wm.IsVertical() && !wm.IsSideways();
return CalcLineHeight(lh, *aStyle.StyleFont(), aPresContext, vertical,
aContent, aBlockBSize, aFontSizeInflation);
}
nscoord ReflowInput::CalcLineHeight(
const StyleLineHeight& aLh, const nsStyleFont& aRelativeToFont,
nsPresContext* aPresContext, bool aIsVertical, const nsIContent* aContent,
nscoord aBlockBSize, float aFontSizeInflation) {
nscoord lineHeight =
ComputeLineHeight(aLh, aRelativeToFont, aPresContext, aIsVertical,
aBlockBSize, aFontSizeInflation);
NS_ASSERTION(lineHeight >= 0, "ComputeLineHeight screwed up");
const auto* input = HTMLInputElement::FromNodeOrNull(aContent);
if (input && input->IsSingleLineTextControl()) {
// For Web-compatibility, single-line text input elements cannot
// have a line-height smaller than 'normal'.
if (!aLh.IsNormal()) {
nscoord normal = ComputeLineHeight(
StyleLineHeight::Normal(), aRelativeToFont, aPresContext, aIsVertical,
aBlockBSize, aFontSizeInflation);
if (lineHeight < normal) {
lineHeight = normal;
}
}
}
return lineHeight;
}
bool SizeComputationInput::ComputeMargin(WritingMode aCBWM,
nscoord aPercentBasis,
LayoutFrameType aFrameType) {
// SVG text frames have no margin.
if (SVGUtils::IsInSVGTextSubtree(mFrame)) {
return false;
}
if (aFrameType == LayoutFrameType::Table) {
// Table frame's margin is inherited to the table wrapper frame via the
// ::-moz-table-wrapper rule in ua.css, so don't set any margins for it.
SetComputedLogicalMargin(mWritingMode, LogicalMargin(mWritingMode));
return false;
}
// If style style can provide us the margin directly, then use it.
const nsStyleMargin* styleMargin = mFrame->StyleMargin();
nsMargin margin;
const bool isCBDependent = !styleMargin->GetMargin(margin);
if (isCBDependent) {
// We have to compute the value. Note that this calculation is
// performed according to the writing mode of the containing block
// (http://dev.w3.org/csswg/css-writing-modes-3/#orthogonal-flows)
if (aPercentBasis == NS_UNCONSTRAINEDSIZE) {
aPercentBasis = 0;
}
LogicalMargin m(aCBWM);
m.IStart(aCBWM) = nsLayoutUtils::ComputeCBDependentValue(
aPercentBasis, styleMargin->mMargin.GetIStart(aCBWM));
m.IEnd(aCBWM) = nsLayoutUtils::ComputeCBDependentValue(
aPercentBasis, styleMargin->mMargin.GetIEnd(aCBWM));
m.BStart(aCBWM) = nsLayoutUtils::ComputeCBDependentValue(
aPercentBasis, styleMargin->mMargin.GetBStart(aCBWM));
m.BEnd(aCBWM) = nsLayoutUtils::ComputeCBDependentValue(
aPercentBasis, styleMargin->mMargin.GetBEnd(aCBWM));
SetComputedLogicalMargin(aCBWM, m);
} else {
SetComputedLogicalMargin(mWritingMode, LogicalMargin(mWritingMode, margin));
}
// ... but font-size-inflation-based margin adjustment uses the
// frame's writing mode
nscoord marginAdjustment = FontSizeInflationListMarginAdjustment(mFrame);
if (marginAdjustment > 0) {
LogicalMargin m = ComputedLogicalMargin(mWritingMode);
m.IStart(mWritingMode) += marginAdjustment;
SetComputedLogicalMargin(mWritingMode, m);
}
return isCBDependent;
}
bool SizeComputationInput::ComputePadding(WritingMode aCBWM,
nscoord aPercentBasis,
LayoutFrameType aFrameType) {
// If style can provide us the padding directly, then use it.
const nsStylePadding* stylePadding = mFrame->StylePadding();
nsMargin padding;
bool isCBDependent = !stylePadding->GetPadding(padding);
// a table row/col group, row/col doesn't have padding
// XXXldb Neither do border-collapse tables.
if (LayoutFrameType::TableRowGroup == aFrameType ||
LayoutFrameType::TableColGroup == aFrameType ||
LayoutFrameType::TableRow == aFrameType ||
LayoutFrameType::TableCol == aFrameType) {
SetComputedLogicalPadding(mWritingMode, LogicalMargin(mWritingMode));
} else if (isCBDependent) {
// We have to compute the value. This calculation is performed
// according to the writing mode of the containing block
// (http://dev.w3.org/csswg/css-writing-modes-3/#orthogonal-flows)
// clamp negative calc() results to 0
if (aPercentBasis == NS_UNCONSTRAINEDSIZE) {
aPercentBasis = 0;
}
LogicalMargin p(aCBWM);
p.IStart(aCBWM) = std::max(
0, nsLayoutUtils::ComputeCBDependentValue(
aPercentBasis, stylePadding->mPadding.GetIStart(aCBWM)));
p.IEnd(aCBWM) =
std::max(0, nsLayoutUtils::ComputeCBDependentValue(
aPercentBasis, stylePadding->mPadding.GetIEnd(aCBWM)));
p.BStart(aCBWM) = std::max(
0, nsLayoutUtils::ComputeCBDependentValue(
aPercentBasis, stylePadding->mPadding.GetBStart(aCBWM)));
p.BEnd(aCBWM) =
std::max(0, nsLayoutUtils::ComputeCBDependentValue(
aPercentBasis, stylePadding->mPadding.GetBEnd(aCBWM)));
SetComputedLogicalPadding(aCBWM, p);
} else {
SetComputedLogicalPadding(mWritingMode,
LogicalMargin(mWritingMode, padding));
}
return isCBDependent;
}
void ReflowInput::ComputeMinMaxValues(const LogicalSize& aCBSize) {
WritingMode wm = GetWritingMode();
const auto& minISize = mStylePosition->MinISize(wm);
const auto& maxISize = mStylePosition->MaxISize(wm);
const auto& minBSize = mStylePosition->MinBSize(wm);
const auto& maxBSize = mStylePosition->MaxBSize(wm);
LogicalSize minWidgetSize(wm);
if (mIsThemed) {
nsPresContext* pc = mFrame->PresContext();
const LayoutDeviceIntSize widget = pc->Theme()->GetMinimumWidgetSize(
pc, mFrame, mStyleDisplay->EffectiveAppearance());
// Convert themed widget's physical dimensions to logical coords.
minWidgetSize = {
wm, LayoutDeviceIntSize::ToAppUnits(widget, pc->AppUnitsPerDevPixel())};
// GetMinimumWidgetSize() returns border-box; we need content-box.
minWidgetSize -= ComputedLogicalBorderPadding(wm).Size(wm);
}
// NOTE: min-width:auto resolves to 0, except on a flex item. (But
// even there, it's supposed to be ignored (i.e. treated as 0) until
// the flex container explicitly resolves & considers it.)
if (minISize.IsAuto()) {
SetComputedMinISize(0);
} else {
SetComputedMinISize(
ComputeISizeValue(aCBSize, mStylePosition->mBoxSizing, minISize));
}
if (mIsThemed) {
SetComputedMinISize(std::max(ComputedMinISize(), minWidgetSize.ISize(wm)));
}
if (maxISize.IsNone()) {
// Specified value of 'none'
SetComputedMaxISize(NS_UNCONSTRAINEDSIZE);
} else {
SetComputedMaxISize(
ComputeISizeValue(aCBSize, mStylePosition->mBoxSizing, maxISize));
}
// If the computed value of 'min-width' is greater than the value of
// 'max-width', 'max-width' is set to the value of 'min-width'
if (ComputedMinISize() > ComputedMaxISize()) {
SetComputedMaxISize(ComputedMinISize());
}
// Check for percentage based values and a containing block height that
// depends on the content height. Treat them like the initial value.
// Likewise, check for calc() with percentages on internal table elements;
// that's treated as the initial value too.
const bool isInternalTableFrame = IsInternalTableFrame();
const nscoord& bPercentageBasis = aCBSize.BSize(wm);
auto BSizeBehavesAsInitialValue = [&](const auto& aBSize) {
if (nsLayoutUtils::IsAutoBSize(aBSize, bPercentageBasis)) {
return true;
}
if (isInternalTableFrame) {
return aBSize.HasLengthAndPercentage();
}
return false;
};
// NOTE: min-height:auto resolves to 0, except on a flex item. (But
// even there, it's supposed to be ignored (i.e. treated as 0) until
// the flex container explicitly resolves & considers it.)
if (BSizeBehavesAsInitialValue(minBSize)) {
SetComputedMinBSize(0);
} else {
SetComputedMinBSize(ComputeBSizeValue(bPercentageBasis,
mStylePosition->mBoxSizing,
minBSize.AsLengthPercentage()));
}
if (mIsThemed) {
SetComputedMinBSize(std::max(ComputedMinBSize(), minWidgetSize.BSize(wm)));
}
if (BSizeBehavesAsInitialValue(maxBSize)) {
// Specified value of 'none'
SetComputedMaxBSize(NS_UNCONSTRAINEDSIZE);
} else {
SetComputedMaxBSize(ComputeBSizeValue(bPercentageBasis,
mStylePosition->mBoxSizing,
maxBSize.AsLengthPercentage()));
}
// If the computed value of 'min-height' is greater than the value of
// 'max-height', 'max-height' is set to the value of 'min-height'
if (ComputedMinBSize() > ComputedMaxBSize()) {
SetComputedMaxBSize(ComputedMinBSize());
}
}
bool ReflowInput::IsInternalTableFrame() const {
return mFrame->IsTableRowGroupFrame() || mFrame->IsTableColGroupFrame() ||
mFrame->IsTableRowFrame() || mFrame->IsTableCellFrame();
}
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