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Diffstat (limited to 'layout/generic/nsAbsoluteContainingBlock.cpp')
| -rw-r--r-- | layout/generic/nsAbsoluteContainingBlock.cpp | 763 |
1 files changed, 763 insertions, 0 deletions
diff --git a/layout/generic/nsAbsoluteContainingBlock.cpp b/layout/generic/nsAbsoluteContainingBlock.cpp new file mode 100644 index 000000000..7c48aae92 --- /dev/null +++ b/layout/generic/nsAbsoluteContainingBlock.cpp @@ -0,0 +1,763 @@ +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* 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/. */ + +/* + * code for managing absolutely positioned children of a rendering + * object that is a containing block for them + */ + +#include "nsAbsoluteContainingBlock.h" + +#include "nsContainerFrame.h" +#include "nsGkAtoms.h" +#include "nsIPresShell.h" +#include "mozilla/CSSAlignUtils.h" +#include "mozilla/ReflowInput.h" +#include "nsPresContext.h" +#include "nsCSSFrameConstructor.h" +#include "nsGridContainerFrame.h" + +#include "mozilla/Sprintf.h" + +#ifdef DEBUG +#include "nsBlockFrame.h" + +static void PrettyUC(nscoord aSize, char* aBuf, int aBufSize) +{ + if (NS_UNCONSTRAINEDSIZE == aSize) { + strcpy(aBuf, "UC"); + } else { + if((int32_t)0xdeadbeef == aSize) { + strcpy(aBuf, "deadbeef"); + } else { + snprintf(aBuf, aBufSize, "%d", aSize); + } + } +} +#endif + +using namespace mozilla; + +typedef mozilla::CSSAlignUtils::AlignJustifyFlags AlignJustifyFlags; + +void +nsAbsoluteContainingBlock::SetInitialChildList(nsIFrame* aDelegatingFrame, + ChildListID aListID, + nsFrameList& aChildList) +{ + NS_PRECONDITION(mChildListID == aListID, "unexpected child list name"); +#ifdef DEBUG + nsFrame::VerifyDirtyBitSet(aChildList); +#endif + mAbsoluteFrames.SetFrames(aChildList); +} + +void +nsAbsoluteContainingBlock::AppendFrames(nsIFrame* aDelegatingFrame, + ChildListID aListID, + nsFrameList& aFrameList) +{ + NS_ASSERTION(mChildListID == aListID, "unexpected child list"); + + // Append the frames to our list of absolutely positioned frames +#ifdef DEBUG + nsFrame::VerifyDirtyBitSet(aFrameList); +#endif + mAbsoluteFrames.AppendFrames(nullptr, aFrameList); + + // no damage to intrinsic widths, since absolutely positioned frames can't + // change them + aDelegatingFrame->PresContext()->PresShell()-> + FrameNeedsReflow(aDelegatingFrame, nsIPresShell::eResize, + NS_FRAME_HAS_DIRTY_CHILDREN); +} + +void +nsAbsoluteContainingBlock::InsertFrames(nsIFrame* aDelegatingFrame, + ChildListID aListID, + nsIFrame* aPrevFrame, + nsFrameList& aFrameList) +{ + NS_ASSERTION(mChildListID == aListID, "unexpected child list"); + NS_ASSERTION(!aPrevFrame || aPrevFrame->GetParent() == aDelegatingFrame, + "inserting after sibling frame with different parent"); + +#ifdef DEBUG + nsFrame::VerifyDirtyBitSet(aFrameList); +#endif + mAbsoluteFrames.InsertFrames(nullptr, aPrevFrame, aFrameList); + + // no damage to intrinsic widths, since absolutely positioned frames can't + // change them + aDelegatingFrame->PresContext()->PresShell()-> + FrameNeedsReflow(aDelegatingFrame, nsIPresShell::eResize, + NS_FRAME_HAS_DIRTY_CHILDREN); +} + +void +nsAbsoluteContainingBlock::RemoveFrame(nsIFrame* aDelegatingFrame, + ChildListID aListID, + nsIFrame* aOldFrame) +{ + NS_ASSERTION(mChildListID == aListID, "unexpected child list"); + nsIFrame* nif = aOldFrame->GetNextInFlow(); + if (nif) { + nif->GetParent()->DeleteNextInFlowChild(nif, false); + } + + mAbsoluteFrames.DestroyFrame(aOldFrame); +} + +void +nsAbsoluteContainingBlock::Reflow(nsContainerFrame* aDelegatingFrame, + nsPresContext* aPresContext, + const ReflowInput& aReflowInput, + nsReflowStatus& aReflowStatus, + const nsRect& aContainingBlock, + AbsPosReflowFlags aFlags, + nsOverflowAreas* aOverflowAreas) +{ + nsReflowStatus reflowStatus = NS_FRAME_COMPLETE; + + const bool reflowAll = aReflowInput.ShouldReflowAllKids(); + const bool isGrid = !!(aFlags & AbsPosReflowFlags::eIsGridContainerCB); + nsIFrame* kidFrame; + nsOverflowContinuationTracker tracker(aDelegatingFrame, true); + for (kidFrame = mAbsoluteFrames.FirstChild(); kidFrame; kidFrame = kidFrame->GetNextSibling()) { + bool kidNeedsReflow = reflowAll || NS_SUBTREE_DIRTY(kidFrame) || + FrameDependsOnContainer(kidFrame, + !!(aFlags & AbsPosReflowFlags::eCBWidthChanged), + !!(aFlags & AbsPosReflowFlags::eCBHeightChanged)); + if (kidNeedsReflow && !aPresContext->HasPendingInterrupt()) { + // Reflow the frame + nsReflowStatus kidStatus = NS_FRAME_COMPLETE; + const nsRect& cb = isGrid ? nsGridContainerFrame::GridItemCB(kidFrame) + : aContainingBlock; + ReflowAbsoluteFrame(aDelegatingFrame, aPresContext, aReflowInput, cb, + aFlags, kidFrame, kidStatus, aOverflowAreas); + nsIFrame* nextFrame = kidFrame->GetNextInFlow(); + if (!NS_FRAME_IS_FULLY_COMPLETE(kidStatus) && + aDelegatingFrame->IsFrameOfType(nsIFrame::eCanContainOverflowContainers)) { + // Need a continuation + if (!nextFrame) { + nextFrame = + aPresContext->PresShell()->FrameConstructor()-> + CreateContinuingFrame(aPresContext, kidFrame, aDelegatingFrame); + } + // Add it as an overflow container. + //XXXfr This is a hack to fix some of our printing dataloss. + // See bug 154892. Not sure how to do it "right" yet; probably want + // to keep continuations within an nsAbsoluteContainingBlock eventually. + tracker.Insert(nextFrame, kidStatus); + NS_MergeReflowStatusInto(&reflowStatus, kidStatus); + } + else { + // Delete any continuations + if (nextFrame) { + nsOverflowContinuationTracker::AutoFinish fini(&tracker, kidFrame); + nextFrame->GetParent()->DeleteNextInFlowChild(nextFrame, true); + } + } + } + else { + tracker.Skip(kidFrame, reflowStatus); + if (aOverflowAreas) { + aDelegatingFrame->ConsiderChildOverflow(*aOverflowAreas, kidFrame); + } + } + + // Make a CheckForInterrupt call, here, not just HasPendingInterrupt. That + // will make sure that we end up reflowing aDelegatingFrame in cases when + // one of our kids interrupted. Otherwise we'd set the dirty or + // dirty-children bit on the kid in the condition below, and then when + // reflow completes and we go to mark dirty bits on all ancestors of that + // kid we'll immediately bail out, because the kid already has a dirty bit. + // In particular, we won't set any dirty bits on aDelegatingFrame, so when + // the following reflow happens we won't reflow the kid in question. This + // might be slightly suboptimal in cases where |kidFrame| itself did not + // interrupt, since we'll trigger a reflow of it too when it's not strictly + // needed. But the logic to not do that is enough more complicated, and + // the case enough of an edge case, that this is probably better. + if (kidNeedsReflow && aPresContext->CheckForInterrupt(aDelegatingFrame)) { + if (aDelegatingFrame->GetStateBits() & NS_FRAME_IS_DIRTY) { + kidFrame->AddStateBits(NS_FRAME_IS_DIRTY); + } else { + kidFrame->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN); + } + } + } + + // Abspos frames can't cause their parent to be incomplete, + // only overflow incomplete. + if (NS_FRAME_IS_NOT_COMPLETE(reflowStatus)) + NS_FRAME_SET_OVERFLOW_INCOMPLETE(reflowStatus); + + NS_MergeReflowStatusInto(&aReflowStatus, reflowStatus); +} + +static inline bool IsFixedPaddingSize(const nsStyleCoord& aCoord) + { return aCoord.ConvertsToLength(); } +static inline bool IsFixedMarginSize(const nsStyleCoord& aCoord) + { return aCoord.ConvertsToLength(); } +static inline bool IsFixedOffset(const nsStyleCoord& aCoord) + { return aCoord.ConvertsToLength(); } + +bool +nsAbsoluteContainingBlock::FrameDependsOnContainer(nsIFrame* f, + bool aCBWidthChanged, + bool aCBHeightChanged) +{ + const nsStylePosition* pos = f->StylePosition(); + // See if f's position might have changed because it depends on a + // placeholder's position + // This can happen in the following cases: + // 1) Vertical positioning. "top" must be auto and "bottom" must be auto + // (otherwise the vertical position is completely determined by + // whichever of them is not auto and the height). + // 2) Horizontal positioning. "left" must be auto and "right" must be auto + // (otherwise the horizontal position is completely determined by + // whichever of them is not auto and the width). + // See ReflowInput::InitAbsoluteConstraints -- these are the + // only cases when we call CalculateHypotheticalBox(). + if ((pos->mOffset.GetTopUnit() == eStyleUnit_Auto && + pos->mOffset.GetBottomUnit() == eStyleUnit_Auto) || + (pos->mOffset.GetLeftUnit() == eStyleUnit_Auto && + pos->mOffset.GetRightUnit() == eStyleUnit_Auto)) { + return true; + } + if (!aCBWidthChanged && !aCBHeightChanged) { + // skip getting style data + return false; + } + const nsStylePadding* padding = f->StylePadding(); + const nsStyleMargin* margin = f->StyleMargin(); + WritingMode wm = f->GetWritingMode(); + if (wm.IsVertical() ? aCBHeightChanged : aCBWidthChanged) { + // See if f's inline-size might have changed. + // If margin-inline-start/end, padding-inline-start/end, + // inline-size, min/max-inline-size are all lengths, 'none', or enumerated, + // then our frame isize does not depend on the parent isize. + // Note that borders never depend on the parent isize. + // XXX All of the enumerated values except -moz-available are ok too. + if (pos->ISizeDependsOnContainer(wm) || + pos->MinISizeDependsOnContainer(wm) || + pos->MaxISizeDependsOnContainer(wm) || + !IsFixedPaddingSize(padding->mPadding.GetIStart(wm)) || + !IsFixedPaddingSize(padding->mPadding.GetIEnd(wm))) { + return true; + } + + // See if f's position might have changed. If we're RTL then the + // rules are slightly different. We'll assume percentage or auto + // margins will always induce a dependency on the size + if (!IsFixedMarginSize(margin->mMargin.GetIStart(wm)) || + !IsFixedMarginSize(margin->mMargin.GetIEnd(wm))) { + return true; + } + if (!wm.IsBidiLTR()) { + // Note that even if 'istart' is a length, our position can + // still depend on the containing block isze, because if + // 'iend' is also a length we will discard 'istart' and be + // positioned relative to the containing block iend edge. + // 'istart' length and 'iend' auto is the only combination + // we can be sure of. + if (!IsFixedOffset(pos->mOffset.GetIStart(wm)) || + pos->mOffset.GetIEndUnit(wm) != eStyleUnit_Auto) { + return true; + } + } else { + if (!IsFixedOffset(pos->mOffset.GetIStart(wm))) { + return true; + } + } + } + if (wm.IsVertical() ? aCBWidthChanged : aCBHeightChanged) { + // See if f's block-size might have changed. + // If margin-block-start/end, padding-block-start/end, + // min-block-size, and max-block-size are all lengths or 'none', + // and bsize is a length or bsize and bend are auto and bstart is not auto, + // then our frame bsize does not depend on the parent bsize. + // Note that borders never depend on the parent bsize. + if ((pos->BSizeDependsOnContainer(wm) && + !(pos->BSize(wm).GetUnit() == eStyleUnit_Auto && + pos->mOffset.GetBEndUnit(wm) == eStyleUnit_Auto && + pos->mOffset.GetBStartUnit(wm) != eStyleUnit_Auto)) || + pos->MinBSizeDependsOnContainer(wm) || + pos->MaxBSizeDependsOnContainer(wm) || + !IsFixedPaddingSize(padding->mPadding.GetBStart(wm)) || + !IsFixedPaddingSize(padding->mPadding.GetBEnd(wm))) { + return true; + } + + // See if f's position might have changed. + if (!IsFixedMarginSize(margin->mMargin.GetBStart(wm)) || + !IsFixedMarginSize(margin->mMargin.GetBEnd(wm))) { + return true; + } + if (!IsFixedOffset(pos->mOffset.GetBStart(wm))) { + return true; + } + } + return false; +} + +void +nsAbsoluteContainingBlock::DestroyFrames(nsIFrame* aDelegatingFrame, + nsIFrame* aDestructRoot) +{ + mAbsoluteFrames.DestroyFramesFrom(aDestructRoot); +} + +void +nsAbsoluteContainingBlock::MarkSizeDependentFramesDirty() +{ + DoMarkFramesDirty(false); +} + +void +nsAbsoluteContainingBlock::MarkAllFramesDirty() +{ + DoMarkFramesDirty(true); +} + +void +nsAbsoluteContainingBlock::DoMarkFramesDirty(bool aMarkAllDirty) +{ + for (nsIFrame* kidFrame : mAbsoluteFrames) { + if (aMarkAllDirty) { + kidFrame->AddStateBits(NS_FRAME_IS_DIRTY); + } else if (FrameDependsOnContainer(kidFrame, true, true)) { + // Add the weakest flags that will make sure we reflow this frame later + kidFrame->AddStateBits(NS_FRAME_HAS_DIRTY_CHILDREN); + } + } +} + +// Given an out-of-flow frame, this method returns the parent frame of +// its placeholder frame, if that parent is a nsContainerFrame. +static nsContainerFrame* +GetPlaceholderContainer(nsPresContext* aPresContext, + nsIFrame* aPositionedFrame) +{ + MOZ_ASSERT(aPositionedFrame, "need non-null frame"); + MOZ_ASSERT(aPositionedFrame->HasAnyStateBits(NS_FRAME_OUT_OF_FLOW), + "expecting abspos frame"); + MOZ_ASSERT(aPresContext && aPresContext == aPositionedFrame->PresContext(), + "need non-null pres context which matches our frame"); + + nsIFrame* placeholder = + aPresContext->PresShell()->GetPlaceholderFrameFor(aPositionedFrame); + + if (!placeholder) { + return nullptr; + } + return do_QueryFrame(placeholder->GetParent()); +} + +/** + * This function returns the offset of an abs/fixed-pos child's static + * position, with respect to the "start" corner of its alignment container, + * according to CSS Box Alignment. This function only operates in a single + * axis at a time -- callers can choose which axis via the |aAbsPosCBAxis| + * parameter. + * + * @param aKidReflowInput The ReflowInput for the to-be-aligned abspos child. + * @param aKidSizeInAbsPosCBWM The child frame's size (after it's been given + * the opportunity to reflow), in terms of + * aAbsPosCBWM. + * @param aAbsPosCBSize The abspos CB size, in terms of aAbsPosCBWM. + * @param aPlaceholderContainer The parent of the child frame's corresponding + * placeholder frame, cast to a nsContainerFrame. + * (This will help us choose which alignment enum + * we should use for the child.) + * @param aAbsPosCBWM The child frame's containing block's WritingMode. + * @param aAbsPosCBAxis The axis (of the containing block) that we should + * be doing this computation for. + */ +static nscoord +OffsetToAlignedStaticPos(const ReflowInput& aKidReflowInput, + const LogicalSize& aKidSizeInAbsPosCBWM, + const LogicalSize& aAbsPosCBSize, + nsContainerFrame* aPlaceholderContainer, + WritingMode aAbsPosCBWM, + LogicalAxis aAbsPosCBAxis) +{ + if (!aPlaceholderContainer) { + // (The placeholder container should be the thing that kicks this whole + // process off, by setting PLACEHOLDER_STATICPOS_NEEDS_CSSALIGN. So it + // should exist... but bail gracefully if it doesn't.) + NS_ERROR("Missing placeholder-container when computing a " + "CSS Box Alignment static position"); + return 0; + } + + // (Most of this function is simply preparing args that we'll pass to + // AlignJustifySelf at the end.) + + // NOTE: Our alignment container is aPlaceholderContainer's content-box + // (or an area within it, if aPlaceholderContainer is a grid). So, we'll + // perform most of our arithmetic/alignment in aPlaceholderContainer's + // WritingMode. For brevity, we use the abbreviation "pc" for "placeholder + // container" in variables below. + WritingMode pcWM = aPlaceholderContainer->GetWritingMode(); + + // Find what axis aAbsPosCBAxis corresponds to, in placeholder's parent's + // writing-mode. + LogicalAxis pcAxis = (pcWM.IsOrthogonalTo(aAbsPosCBWM) + ? GetOrthogonalAxis(aAbsPosCBAxis) + : aAbsPosCBAxis); + + nsIAtom* parentType = aPlaceholderContainer->GetType(); + LogicalSize alignAreaSize(pcWM); + if (parentType == nsGkAtoms::flexContainerFrame) { + // The alignment container is the flex container's content box: + alignAreaSize = aPlaceholderContainer->GetLogicalSize(pcWM); + LogicalMargin pcBorderPadding = + aPlaceholderContainer->GetLogicalUsedBorderAndPadding(pcWM); + alignAreaSize -= pcBorderPadding.Size(pcWM); + } else if (parentType == nsGkAtoms::gridContainerFrame) { + // This abspos elem's parent is a grid container. Per CSS Grid 10.1 & 10.2: + // - If the grid container *also* generates the abspos containing block (a + // grid area) for this abspos child, we use that abspos containing block as + // the alignment container, too. (And its size is aAbsPosCBSize.) + // - Otherwise, we use the grid's padding box as the alignment container. + // https://drafts.csswg.org/css-grid/#static-position + if (aPlaceholderContainer == aKidReflowInput.mCBReflowInput->mFrame) { + // The alignment container is the grid area that we're using as the + // absolute containing block. + alignAreaSize = aAbsPosCBSize.ConvertTo(pcWM, aAbsPosCBWM); + } else { + // The alignment container is a the grid container's padding box (which + // we can get by subtracting away its border from frame's size): + alignAreaSize = aPlaceholderContainer->GetLogicalSize(pcWM); + LogicalMargin pcBorder = + aPlaceholderContainer->GetLogicalUsedBorder(pcWM); + alignAreaSize -= pcBorder.Size(pcWM); + } + } else { + NS_ERROR("Unsupported container for abpsos CSS Box Alignment"); + return 0; // (leave the child at the start of its alignment container) + } + + nscoord alignAreaSizeInAxis = (pcAxis == eLogicalAxisInline) + ? alignAreaSize.ISize(pcWM) + : alignAreaSize.BSize(pcWM); + + AlignJustifyFlags flags = AlignJustifyFlags::eIgnoreAutoMargins; + uint16_t alignConst = + aPlaceholderContainer->CSSAlignmentForAbsPosChild(aKidReflowInput, pcAxis); + // XXXdholbert: Handle <overflow-position> in bug 1311892 (by conditionally + // setting AlignJustifyFlags::eOverflowSafe in |flags|.) For now, we behave + // as if "unsafe" was the specified value (which is basically equivalent to + // the default behavior, when no value is specified -- though the default + // behavior also has some [at-risk] extra nuance about scroll containers...) + // For now we ignore & strip off <overflow-position> bits, until bug 1311892. + alignConst &= ~NS_STYLE_ALIGN_FLAG_BITS; + + // Find out if placeholder-container & the OOF child have the same start-sides + // in the placeholder-container's pcAxis. + WritingMode kidWM = aKidReflowInput.GetWritingMode(); + if (pcWM.ParallelAxisStartsOnSameSide(pcAxis, kidWM)) { + flags |= AlignJustifyFlags::eSameSide; + } + + // (baselineAdjust is unused. CSSAlignmentForAbsPosChild() should've + // converted 'baseline'/'last baseline' enums to their fallback values.) + const nscoord baselineAdjust = nscoord(0); + + // AlignJustifySelf operates in the kid's writing mode, so we need to + // represent the child's size and the desired axis in that writing mode: + LogicalSize kidSizeInOwnWM = aKidSizeInAbsPosCBWM.ConvertTo(kidWM, + aAbsPosCBWM); + LogicalAxis kidAxis = (kidWM.IsOrthogonalTo(aAbsPosCBWM) + ? GetOrthogonalAxis(aAbsPosCBAxis) + : aAbsPosCBAxis); + + nscoord offset = + CSSAlignUtils::AlignJustifySelf(alignConst, kidAxis, flags, + baselineAdjust, alignAreaSizeInAxis, + aKidReflowInput, kidSizeInOwnWM); + + // "offset" is in terms of the CSS Box Alignment container (i.e. it's in + // terms of pcWM). But our return value needs to in terms of the containing + // block's writing mode, which might have the opposite directionality in the + // given axis. In that case, we just need to negate "offset" when returning, + // to make it have the right effect as an offset for coordinates in the + // containing block's writing mode. + if (!pcWM.ParallelAxisStartsOnSameSide(pcAxis, aAbsPosCBWM)) { + return -offset; + } + return offset; +} + +void +nsAbsoluteContainingBlock::ResolveSizeDependentOffsets( + nsPresContext* aPresContext, + ReflowInput& aKidReflowInput, + const LogicalSize& aKidSize, + const LogicalMargin& aMargin, + LogicalMargin* aOffsets, + LogicalSize* aLogicalCBSize) +{ + WritingMode wm = aKidReflowInput.GetWritingMode(); + WritingMode outerWM = aKidReflowInput.mParentReflowInput->GetWritingMode(); + + // Now that we know the child's size, we resolve any sentinel values in its + // IStart/BStart offset coordinates that depend on that size. + // * NS_AUTOOFFSET indicates that the child's position in the given axis + // is determined by its end-wards offset property, combined with its size and + // available space. e.g.: "top: auto; height: auto; bottom: 50px" + // * m{I,B}OffsetsResolvedAfterSize indicate that the child is using its + // static position in that axis, *and* its static position is determined by + // the axis-appropriate css-align property (which may require the child's + // size, e.g. to center it within the parent). + if ((NS_AUTOOFFSET == aOffsets->IStart(outerWM)) || + (NS_AUTOOFFSET == aOffsets->BStart(outerWM)) || + aKidReflowInput.mFlags.mIOffsetsNeedCSSAlign || + aKidReflowInput.mFlags.mBOffsetsNeedCSSAlign) { + if (-1 == aLogicalCBSize->ISize(wm)) { + // Get the containing block width/height + const ReflowInput* parentRI = aKidReflowInput.mParentReflowInput; + *aLogicalCBSize = + aKidReflowInput.ComputeContainingBlockRectangle(aPresContext, + parentRI); + } + + const LogicalSize logicalCBSizeOuterWM = aLogicalCBSize->ConvertTo(outerWM, + wm); + + // placeholderContainer is used in each of the m{I,B}OffsetsNeedCSSAlign + // clauses. We declare it at this scope so we can avoid having to look + // it up twice (and only look it up if it's needed). + nsContainerFrame* placeholderContainer = nullptr; + + if (NS_AUTOOFFSET == aOffsets->IStart(outerWM)) { + NS_ASSERTION(NS_AUTOOFFSET != aOffsets->IEnd(outerWM), + "Can't solve for both start and end"); + aOffsets->IStart(outerWM) = + logicalCBSizeOuterWM.ISize(outerWM) - + aOffsets->IEnd(outerWM) - aMargin.IStartEnd(outerWM) - + aKidSize.ISize(outerWM); + } else if (aKidReflowInput.mFlags.mIOffsetsNeedCSSAlign) { + placeholderContainer = GetPlaceholderContainer(aPresContext, + aKidReflowInput.mFrame); + nscoord offset = OffsetToAlignedStaticPos(aKidReflowInput, aKidSize, + logicalCBSizeOuterWM, + placeholderContainer, + outerWM, eLogicalAxisInline); + // Shift IStart from its current position (at start corner of the + // alignment container) by the returned offset. And set IEnd to the + // distance between the kid's end edge to containing block's end edge. + aOffsets->IStart(outerWM) += offset; + aOffsets->IEnd(outerWM) = + logicalCBSizeOuterWM.ISize(outerWM) - + (aOffsets->IStart(outerWM) + aKidSize.ISize(outerWM)); + } + + if (NS_AUTOOFFSET == aOffsets->BStart(outerWM)) { + aOffsets->BStart(outerWM) = + logicalCBSizeOuterWM.BSize(outerWM) - + aOffsets->BEnd(outerWM) - aMargin.BStartEnd(outerWM) - + aKidSize.BSize(outerWM); + } else if (aKidReflowInput.mFlags.mBOffsetsNeedCSSAlign) { + if (!placeholderContainer) { + placeholderContainer = GetPlaceholderContainer(aPresContext, + aKidReflowInput.mFrame); + } + nscoord offset = OffsetToAlignedStaticPos(aKidReflowInput, aKidSize, + logicalCBSizeOuterWM, + placeholderContainer, + outerWM, eLogicalAxisBlock); + // Shift BStart from its current position (at start corner of the + // alignment container) by the returned offset. And set BEnd to the + // distance between the kid's end edge to containing block's end edge. + aOffsets->BStart(outerWM) += offset; + aOffsets->BEnd(outerWM) = + logicalCBSizeOuterWM.BSize(outerWM) - + (aOffsets->BStart(outerWM) + aKidSize.BSize(outerWM)); + } + aKidReflowInput.SetComputedLogicalOffsets(aOffsets->ConvertTo(wm, outerWM)); + } +} + +// XXX Optimize the case where it's a resize reflow and the absolutely +// positioned child has the exact same size and position and skip the +// reflow... + +// When bug 154892 is checked in, make sure that when +// mChildListID == kFixedList, the height is unconstrained. +// since we don't allow replicated frames to split. + +void +nsAbsoluteContainingBlock::ReflowAbsoluteFrame(nsIFrame* aDelegatingFrame, + nsPresContext* aPresContext, + const ReflowInput& aReflowInput, + const nsRect& aContainingBlock, + AbsPosReflowFlags aFlags, + nsIFrame* aKidFrame, + nsReflowStatus& aStatus, + nsOverflowAreas* aOverflowAreas) +{ +#ifdef DEBUG + if (nsBlockFrame::gNoisyReflow) { + nsFrame::IndentBy(stdout,nsBlockFrame::gNoiseIndent); + printf("abs pos "); + nsAutoString name; + aKidFrame->GetFrameName(name); + printf("%s ", NS_LossyConvertUTF16toASCII(name).get()); + + char width[16]; + char height[16]; + PrettyUC(aReflowInput.AvailableWidth(), width, 16); + PrettyUC(aReflowInput.AvailableHeight(), height, 16); + printf(" a=%s,%s ", width, height); + PrettyUC(aReflowInput.ComputedWidth(), width, 16); + PrettyUC(aReflowInput.ComputedHeight(), height, 16); + printf("c=%s,%s \n", width, height); + } + AutoNoisyIndenter indent(nsBlockFrame::gNoisy); +#endif // DEBUG + + WritingMode wm = aKidFrame->GetWritingMode(); + LogicalSize logicalCBSize(wm, aContainingBlock.Size()); + nscoord availISize = logicalCBSize.ISize(wm); + if (availISize == -1) { + NS_ASSERTION(aReflowInput.ComputedSize(wm).ISize(wm) != + NS_UNCONSTRAINEDSIZE, + "Must have a useful inline-size _somewhere_"); + availISize = + aReflowInput.ComputedSizeWithPadding(wm).ISize(wm); + } + + uint32_t rsFlags = 0; + if (aFlags & AbsPosReflowFlags::eIsGridContainerCB) { + // When a grid container generates the abs.pos. CB for a *child* then + // the static position is determined via CSS Box Alignment within the + // abs.pos. CB (a grid area, i.e. a piece of the grid). In this scenario, + // due to the multiple coordinate spaces in play, we use a convenience flag + // to simply have the child's ReflowInput give it a static position at its + // abs.pos. CB origin, and then we'll align & offset it from there. + nsIFrame* placeholder = + aPresContext->PresShell()->GetPlaceholderFrameFor(aKidFrame); + if (placeholder && placeholder->GetParent() == aDelegatingFrame) { + rsFlags |= ReflowInput::STATIC_POS_IS_CB_ORIGIN; + } + } + ReflowInput kidReflowInput(aPresContext, aReflowInput, aKidFrame, + LogicalSize(wm, availISize, + NS_UNCONSTRAINEDSIZE), + &logicalCBSize, rsFlags); + + // Get the border values + WritingMode outerWM = aReflowInput.GetWritingMode(); + const LogicalMargin border(outerWM, + aReflowInput.mStyleBorder->GetComputedBorder()); + LogicalMargin margin = + kidReflowInput.ComputedLogicalMargin().ConvertTo(outerWM, wm); + + // If we're doing CSS Box Alignment in either axis, that will apply the + // margin for us in that axis (since the thing that's aligned is the margin + // box). So, we clear out the margin here to avoid applying it twice. + if (kidReflowInput.mFlags.mIOffsetsNeedCSSAlign) { + margin.IStart(outerWM) = margin.IEnd(outerWM) = 0; + } + if (kidReflowInput.mFlags.mBOffsetsNeedCSSAlign) { + margin.BStart(outerWM) = margin.BEnd(outerWM) = 0; + } + + bool constrainBSize = (aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE) + && (aFlags & AbsPosReflowFlags::eConstrainHeight) + // Don't split if told not to (e.g. for fixed frames) + && (aDelegatingFrame->GetType() != nsGkAtoms::inlineFrame) + //XXX we don't handle splitting frames for inline absolute containing blocks yet + && (aKidFrame->GetLogicalRect(aContainingBlock.Size()).BStart(wm) <= + aReflowInput.AvailableBSize()); + // Don't split things below the fold. (Ideally we shouldn't *have* + // anything totally below the fold, but we can't position frames + // across next-in-flow breaks yet. + if (constrainBSize) { + kidReflowInput.AvailableBSize() = + aReflowInput.AvailableBSize() - border.ConvertTo(wm, outerWM).BStart(wm) - + kidReflowInput.ComputedLogicalMargin().BStart(wm); + if (NS_AUTOOFFSET != kidReflowInput.ComputedLogicalOffsets().BStart(wm)) { + kidReflowInput.AvailableBSize() -= + kidReflowInput.ComputedLogicalOffsets().BStart(wm); + } + } + + // Do the reflow + ReflowOutput kidDesiredSize(kidReflowInput); + aKidFrame->Reflow(aPresContext, kidDesiredSize, kidReflowInput, aStatus); + + const LogicalSize kidSize = kidDesiredSize.Size(wm).ConvertTo(outerWM, wm); + + LogicalMargin offsets = + kidReflowInput.ComputedLogicalOffsets().ConvertTo(outerWM, wm); + + // If we're solving for start in either inline or block direction, + // then compute it now that we know the dimensions. + ResolveSizeDependentOffsets(aPresContext, kidReflowInput, kidSize, margin, + &offsets, &logicalCBSize); + + // Position the child relative to our padding edge + LogicalRect rect(outerWM, + border.IStart(outerWM) + offsets.IStart(outerWM) + + margin.IStart(outerWM), + border.BStart(outerWM) + offsets.BStart(outerWM) + + margin.BStart(outerWM), + kidSize.ISize(outerWM), kidSize.BSize(outerWM)); + nsRect r = + rect.GetPhysicalRect(outerWM, logicalCBSize.GetPhysicalSize(wm) + + border.Size(outerWM).GetPhysicalSize(outerWM)); + + // Offset the frame rect by the given origin of the absolute containing block. + // If the frame is auto-positioned on both sides of an axis, it will be + // positioned based on its containing block and we don't need to offset + // (unless the caller demands it (the STATIC_POS_IS_CB_ORIGIN case)). + if (aContainingBlock.TopLeft() != nsPoint(0, 0)) { + const nsStyleSides& offsets = kidReflowInput.mStylePosition->mOffset; + if (!(offsets.GetLeftUnit() == eStyleUnit_Auto && + offsets.GetRightUnit() == eStyleUnit_Auto) || + (rsFlags & ReflowInput::STATIC_POS_IS_CB_ORIGIN)) { + r.x += aContainingBlock.x; + } + if (!(offsets.GetTopUnit() == eStyleUnit_Auto && + offsets.GetBottomUnit() == eStyleUnit_Auto) || + (rsFlags & ReflowInput::STATIC_POS_IS_CB_ORIGIN)) { + r.y += aContainingBlock.y; + } + } + + aKidFrame->SetRect(r); + + nsView* view = aKidFrame->GetView(); + if (view) { + // Size and position the view and set its opacity, visibility, content + // transparency, and clip + nsContainerFrame::SyncFrameViewAfterReflow(aPresContext, aKidFrame, view, + kidDesiredSize.VisualOverflow()); + } else { + nsContainerFrame::PositionChildViews(aKidFrame); + } + + aKidFrame->DidReflow(aPresContext, &kidReflowInput, + nsDidReflowStatus::FINISHED); + +#ifdef DEBUG + if (nsBlockFrame::gNoisyReflow) { + nsFrame::IndentBy(stdout,nsBlockFrame::gNoiseIndent - 1); + printf("abs pos "); + nsAutoString name; + aKidFrame->GetFrameName(name); + printf("%s ", NS_LossyConvertUTF16toASCII(name).get()); + printf("%p rect=%d,%d,%d,%d\n", static_cast<void*>(aKidFrame), + r.x, r.y, r.width, r.height); + } +#endif + + if (aOverflowAreas) { + aOverflowAreas->UnionWith(kidDesiredSize.mOverflowAreas + r.TopLeft()); + } +} |