Quelle nsFieldSetFrame.cpp Sprache: C

/* -*- 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/. */

#include "nsFieldSetFrame.h"
#include "mozilla/dom/HTMLLegendElement.h"

#include <algorithm>
#include "gfxContext.h"
#include "mozilla/Baseline.h"
#include "mozilla/gfx/2D.h"
#include "mozilla/Likely.h"
#include "mozilla/PresShell.h"
#include "mozilla/Maybe.h"
#include "mozilla/webrender/WebRenderAPI.h"
#include "mozilla/ScrollContainerFrame.h"
#include "nsBlockFrame.h"
#include "nsCSSAnonBoxes.h"
#include "nsCSSFrameConstructor.h"
#include "nsCSSRendering.h"
#include "nsDisplayList.h"
#include "nsGkAtoms.h"
#include "nsIFrameInlines.h"
#include "nsLayoutUtils.h"
#include "nsStyleConsts.h"

using namespace mozilla;
using namespace mozilla::gfx;
using namespace mozilla::layout;
using image::ImgDrawResult;

nsContainerFrame* NS_NewFieldSetFrame(PresShell* aPresShell,
                                      ComputedStyle* aStyle) {
  return new (aPresShell) nsFieldSetFrame(aStyle, aPresShell->GetPresContext());
}

NS_IMPL_FRAMEARENA_HELPERS(nsFieldSetFrame)
NS_QUERYFRAME_HEAD(nsFieldSetFrame)
  NS_QUERYFRAME_ENTRY(nsFieldSetFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)

nsFieldSetFrame::nsFieldSetFrame(ComputedStyle* aStyle,
                                 nsPresContext* aPresContext)
    : nsContainerFrame(aStyle, aPresContext, kClassID),
      mLegendRect(GetWritingMode()) {
  mLegendSpace = 0;
}

nsRect nsFieldSetFrame::VisualBorderRectRelativeToSelf() const {
  WritingMode wm = GetWritingMode();
  LogicalRect r(wm, LogicalPoint(wm, 0, 0), GetLogicalSize(wm));
  nsSize containerSize = r.Size(wm).GetPhysicalSize(wm);
  nsIFrame* legend = GetLegend();
  if (legend && !GetPrevInFlow()) {
    nscoord legendSize = legend->GetLogicalSize(wm).BSize(wm);
    auto legendMargin = legend->GetLogicalUsedMargin(wm);
    nscoord legendStartMargin = legendMargin.BStart(wm);
    nscoord legendEndMargin = legendMargin.BEnd(wm);
    nscoord border = GetUsedBorder().Side(wm.PhysicalSide(LogicalSide::BStart));
    // Calculate the offset from the border area block-axis start edge needed to
    // center-align our border with the legend's border-box (in the block-axis).
    nscoord off = (legendStartMargin + legendSize / 2) - border / 2;
    // We don't want to display our border above our border area.
    if (off > nscoord(0)) {
      nscoord marginBoxSize = legendStartMargin + legendSize + legendEndMargin;
      if (marginBoxSize > border) {
        // We don't want to display our border below the legend's margin-box,
        // so we align it to the block-axis end if that happens.
        nscoord overflow = off + border - marginBoxSize;
        if (overflow > nscoord(0)) {
          off -= overflow;
        }
        r.BStart(wm) += off;
        r.BSize(wm) -= off;
      }
    }
  }
  return r.GetPhysicalRect(wm, containerSize);
}

nsContainerFrame* nsFieldSetFrame::GetInner() const {
  for (nsIFrame* child : mFrames) {
    if (child->Style()->GetPseudoType() == PseudoStyleType::fieldsetContent) {
      return static_cast<nsContainerFrame*>(child);
    }
  }
  return nullptr;
}

nsIFrame* nsFieldSetFrame::GetLegend() const {
  for (nsIFrame* child : mFrames) {
    if (child->Style()->GetPseudoType() != PseudoStyleType::fieldsetContent) {
      return child;
    }
  }
  return nullptr;
}

namespace mozilla {

class nsDisplayFieldSetBorder final : public nsPaintedDisplayItem {
public:
  nsDisplayFieldSetBorder(nsDisplayListBuilder* aBuilder,
                          nsFieldSetFrame* aFrame)
      : nsPaintedDisplayItem(aBuilder, aFrame) {
    MOZ_COUNT_CTOR(nsDisplayFieldSetBorder);
  }

  MOZ_COUNTED_DTOR_FINAL(nsDisplayFieldSetBorder)

  void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override;
  bool CreateWebRenderCommands(
      mozilla::wr::DisplayListBuilder& aBuilder,
      mozilla::wr::IpcResourceUpdateQueue& aResources,
      const StackingContextHelper& aSc,
      mozilla::layers::RenderRootStateManager* aManager,
      nsDisplayListBuilder* aDisplayListBuilder) override;
  virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
                           bool* aSnap) const override;
  NS_DISPLAY_DECL_NAME("FieldSetBorder", TYPE_FIELDSET_BORDER_BACKGROUND)
};

void nsDisplayFieldSetBorder::Paint(nsDisplayListBuilder* aBuilder,
                                    gfxContext* aCtx) {
  Unused << static_cast<nsFieldSetFrame*>(mFrame)->PaintBorder(
      aBuilder, *aCtx, ToReferenceFrame(), GetPaintRect(aBuilder, aCtx));
}

nsRect nsDisplayFieldSetBorder::GetBounds(nsDisplayListBuilder* aBuilder,
                                          bool* aSnap) const {
  // Just go ahead and claim our frame's overflow rect as the bounds, because we
  // may have border-image-outset or other features that cause borders to extend
  // outside the border rect.  We could try to duplicate all the complexity
  // nsDisplayBorder has here, but keeping things in sync would be a pain, and
  // this code is not typically performance-sensitive.
  *aSnap = false;
  return Frame()->InkOverflowRectRelativeToSelf() + ToReferenceFrame();
}

bool nsDisplayFieldSetBorder::CreateWebRenderCommands(
    mozilla::wr::DisplayListBuilder& aBuilder,
    mozilla::wr::IpcResourceUpdateQueue& aResources,
    const StackingContextHelper& aSc,
    mozilla::layers::RenderRootStateManager* aManager,
    nsDisplayListBuilder* aDisplayListBuilder) {
  auto frame = static_cast<nsFieldSetFrame*>(mFrame);
  auto offset = ToReferenceFrame();
  Maybe<wr::SpaceAndClipChainHelper> clipOut;

  nsRect rect = frame->VisualBorderRectRelativeToSelf() + offset;
  nsDisplayBoxShadowInner::CreateInsetBoxShadowWebRenderCommands(
      aBuilder, aSc, rect, mFrame, rect);

  if (nsIFrame* legend = frame->GetLegend()) {
    nsRect legendRect = legend->GetNormalRect() + offset;

    // Make sure we clip all of the border in case the legend is smaller.
    nscoord borderTopWidth = frame->GetUsedBorder().top;
    if (legendRect.height < borderTopWidth) {
      legendRect.height = borderTopWidth;
      legendRect.y = offset.y;
    }

    if (!legendRect.IsEmpty()) {
      // We need to clip out the part of the border where the legend would go
      auto appUnitsPerDevPixel = frame->PresContext()->AppUnitsPerDevPixel();
      auto layoutRect = wr::ToLayoutRect(LayoutDeviceRect::FromAppUnits(
          frame->InkOverflowRectRelativeToSelf() + offset,
          appUnitsPerDevPixel));

      wr::ComplexClipRegion region;
      region.rect = wr::ToLayoutRect(
          LayoutDeviceRect::FromAppUnits(legendRect, appUnitsPerDevPixel));
      region.mode = wr::ClipMode::ClipOut;
      region.radii = wr::EmptyBorderRadius();

      auto rect_clip = aBuilder.DefineRectClip(Nothing(), layoutRect);
      auto complex_clip = aBuilder.DefineRoundedRectClip(Nothing(), region);
      auto clipChain =
          aBuilder.DefineClipChain({rect_clip, complex_clip}, true);
      clipOut.emplace(aBuilder, clipChain);
    }
  } else {
    rect = nsRect(offset, frame->GetRect().Size());
  }

  ImgDrawResult drawResult = nsCSSRendering::CreateWebRenderCommandsForBorder(
      this, mFrame, rect, aBuilder, aResources, aSc, aManager,
      aDisplayListBuilder);
  if (drawResult == ImgDrawResult::NOT_SUPPORTED) {
    return false;
  }
  return true;
};

}  // namespace mozilla

void nsFieldSetFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
                                       const nsDisplayListSet& aLists) {
  // Paint our background and border in a special way.
  // REVIEW: We don't really need to check frame emptiness here; if it's empty,
  // the background/border display item won't do anything, and if it isn't
  // empty, we need to paint the outline
  if (!HasAnyStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER) &&
      IsVisibleForPainting()) {
    DisplayOutsetBoxShadowUnconditional(aBuilder, aLists.BorderBackground());

    const nsRect rect =
        VisualBorderRectRelativeToSelf() + aBuilder->ToReferenceFrame(this);

    nsDisplayBackgroundImage::AppendBackgroundItemsToTop(
        aBuilder, this, rect, aLists.BorderBackground(),
        /* aAllowWillPaintBorderOptimization = */ false);

    aLists.BorderBackground()->AppendNewToTop<nsDisplayFieldSetBorder>(aBuilder,
                                                                       this);

    DisplayOutlineUnconditional(aBuilder, aLists);

    DO_GLOBAL_REFLOW_COUNT_DSP("nsFieldSetFrame");
  }

  if (GetPrevInFlow()) {
    DisplayOverflowContainers(aBuilder, aLists);
  }

  nsDisplayListCollection contentDisplayItems(aBuilder);
  if (nsIFrame* inner = GetInner()) {
    // Collect the inner frame's display items into their own collection.
    // We need to be calling BuildDisplayList on it before the legend in
    // case it contains out-of-flow frames whose placeholders are in the
    // legend. However, we want the inner frame's display items to be
    // after the legend's display items in z-order, so we need to save them
    // and append them later.
    BuildDisplayListForChild(aBuilder, inner, contentDisplayItems);
  }
  if (nsIFrame* legend = GetLegend()) {
    // The legend's background goes on our BlockBorderBackgrounds list because
    // it's a block child.
    nsDisplayListSet set(aLists, aLists.BlockBorderBackgrounds());
    BuildDisplayListForChild(aBuilder, legend, set);
  }
  // Put the inner frame's display items on the master list. Note that this
  // moves its border/background display items to our BorderBackground() list,
  // which isn't really correct, but it's OK because the inner frame is
  // anonymous and can't have its own border and background.
  contentDisplayItems.MoveTo(aLists);
}

ImgDrawResult nsFieldSetFrame::PaintBorder(nsDisplayListBuilder* aBuilder,
                                           gfxContext& aRenderingContext,
                                           nsPoint aPt,
                                           const nsRect& aDirtyRect) {
  // If the border is smaller than the legend, move the border down
  // to be centered on the legend.  We call VisualBorderRectRelativeToSelf() to
  // compute the border positioning.
  // FIXME: This means border-radius clamping is incorrect; we should
  // override nsIFrame::GetBorderRadii.
  nsRect rect = VisualBorderRectRelativeToSelf() + aPt;
  nsPresContext* presContext = PresContext();

  const auto skipSides = GetSkipSides();
  PaintBorderFlags borderFlags = aBuilder->ShouldSyncDecodeImages()
                                     ? PaintBorderFlags::SyncDecodeImages
                                     : PaintBorderFlags();

  ImgDrawResult result = ImgDrawResult::SUCCESS;

  nsCSSRendering::PaintBoxShadowInner(presContext, aRenderingContext, this,
                                      rect);

  if (nsIFrame* legend = GetLegend()) {
    // We want to avoid drawing our border under the legend, so clip out the
    // legend while drawing our border.  We don't want to use mLegendRect here,
    // because we do want to draw our border under the legend's inline-start and
    // -end margins.  And we use GetNormalRect(), not GetRect(), because we do
    // not want relative positioning applied to the legend to change how our
    // border looks.
    nsRect legendRect = legend->GetNormalRect() + aPt;

    // Make sure we clip all of the border in case the legend is smaller.
    nscoord borderTopWidth = GetUsedBorder().top;
    if (legendRect.height < borderTopWidth) {
      legendRect.height = borderTopWidth;
      legendRect.y = aPt.y;
    }

    DrawTarget* drawTarget = aRenderingContext.GetDrawTarget();
    // We set up a clip path which has our rect clockwise and the legend rect
    // counterclockwise, with FILL_WINDING as the fill rule.  That will allow us
    // to paint within our rect but outside the legend rect.  For "our rect" we
    // use our ink overflow rect (relative to ourselves, so it's not affected
    // by transforms), because we can have borders sticking outside our border
    // box (e.g. due to border-image-outset).
    RefPtr<PathBuilder> pathBuilder =
        drawTarget->CreatePathBuilder(FillRule::FILL_WINDING);
    int32_t appUnitsPerDevPixel = presContext->AppUnitsPerDevPixel();
    AppendRectToPath(pathBuilder,
                     NSRectToSnappedRect(InkOverflowRectRelativeToSelf() + aPt,
                                         appUnitsPerDevPixel, *drawTarget),
                     true);
    AppendRectToPath(
        pathBuilder,
        NSRectToSnappedRect(legendRect, appUnitsPerDevPixel, *drawTarget),
        false);
    RefPtr<Path> clipPath = pathBuilder->Finish();

    aRenderingContext.Save();
    aRenderingContext.Clip(clipPath);
    result &= nsCSSRendering::PaintBorder(presContext, aRenderingContext, this,
                                          aDirtyRect, rect, mComputedStyle,
                                          borderFlags, skipSides);
    aRenderingContext.Restore();
  } else {
    result &= nsCSSRendering::PaintBorder(
        presContext, aRenderingContext, this, aDirtyRect,
        nsRect(aPt, mRect.Size()), mComputedStyle, borderFlags, skipSides);
  }

  return result;
}

nscoord nsFieldSetFrame::IntrinsicISize(const IntrinsicSizeInput& aInput,
                                        IntrinsicISizeType aType) {
  // Both inner and legend are children, and if the fieldset is
  // size-contained they should not contribute to the intrinsic size.
  if (Maybe<nscoord> containISize = ContainIntrinsicISize()) {
    return *containISize;
  }

  nscoord legendWidth = 0;
  if (nsIFrame* legend = GetLegend()) {
    legendWidth =
        nsLayoutUtils::IntrinsicForContainer(aInput.mContext, legend, aType);
  }

  nscoord contentWidth = 0;
  if (nsIFrame* inner = GetInner()) {
    // Ignore padding on the inner, since the padding will be applied to the
    // outer instead, and the padding computed for the inner is wrong
    // for percentage padding.
    contentWidth = nsLayoutUtils::IntrinsicForContainer(
        aInput.mContext, inner, aType, aInput.mPercentageBasisForChildren,
        nsLayoutUtils::IGNORE_PADDING);
  }

  return std::max(legendWidth, contentWidth);
}

/* virtual */
void nsFieldSetFrame::Reflow(nsPresContext* aPresContext,
                             ReflowOutput& aDesiredSize,
                             const ReflowInput& aReflowInput,
                             nsReflowStatus& aStatus) {
  using LegendAlignValue = mozilla::dom::HTMLLegendElement::LegendAlignValue;

  MarkInReflow();
  DO_GLOBAL_REFLOW_COUNT("nsFieldSetFrame");
  MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!");
  NS_WARNING_ASSERTION(aReflowInput.ComputedISize() != NS_UNCONSTRAINEDSIZE,
                       "Should have a precomputed inline-size!");

  OverflowAreas ocBounds;
  nsReflowStatus ocStatus;
  auto* prevInFlow = static_cast<nsFieldSetFrame*>(GetPrevInFlow());
  if (prevInFlow) {
    ReflowOverflowContainerChildren(aPresContext, aReflowInput, ocBounds,
                                    ReflowChildFlags::Default, ocStatus);

    AutoFrameListPtr prevOverflowFrames(PresContext(),
                                        prevInFlow->StealOverflowFrames());
    if (prevOverflowFrames) {
      nsContainerFrame::ReparentFrameViewList(*prevOverflowFrames, prevInFlow,
                                              this);
      mFrames.InsertFrames(this, nullptr, std::move(*prevOverflowFrames));
    }
  }

  bool reflowInner;
  bool reflowLegend;
  nsIFrame* legend = GetLegend();
  nsContainerFrame* inner = GetInner();
  if (!legend || !inner) {
    if (DrainSelfOverflowList()) {
      legend = GetLegend();
      inner = GetInner();
    }
  }
  if (aReflowInput.ShouldReflowAllKids() || GetNextInFlow() ||
      aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE) {
    reflowInner = inner != nullptr;
    reflowLegend = legend != nullptr;
  } else {
    reflowInner = inner && inner->IsSubtreeDirty();
    reflowLegend = legend && legend->IsSubtreeDirty();
  }

  // @note |this| frame applies borders but not any padding.  Our anonymous
  // inner frame applies the padding (but not borders).
  const auto wm = GetWritingMode();
  auto skipSides = PreReflowBlockLevelLogicalSkipSides();
  LogicalMargin border =
      aReflowInput.ComputedLogicalBorder(wm).ApplySkipSides(skipSides);
  LogicalSize availSize(wm, aReflowInput.ComputedSize().ISize(wm),
                        aReflowInput.AvailableBSize());

  // Figure out how big the legend is if there is one.
  LogicalMargin legendMargin(wm);
  Maybe<ReflowInput> legendReflowInput;
  if (legend) {
    const auto legendWM = legend->GetWritingMode();
    LogicalSize legendAvailSize = availSize.ConvertTo(legendWM, wm);
    ComputeSizeFlags sizeFlags;
    if (legend->StylePosition()->ISize(wm).IsAuto()) {
      sizeFlags = ComputeSizeFlag::ShrinkWrap;
    }
    ReflowInput::InitFlags initFlags;  // intentionally empty
    StyleSizeOverrides sizeOverrides;  // intentionally empty
    legendReflowInput.emplace(aPresContext, aReflowInput, legend,
                              legendAvailSize, Nothing(), initFlags,
                              sizeOverrides, sizeFlags);
  }
  const bool avoidBreakInside = ShouldAvoidBreakInside(aReflowInput);
  if (reflowLegend) {
    ReflowOutput legendDesiredSize(aReflowInput);

    // We'll move the legend to its proper place later, so the position
    // and containerSize passed here are unimportant.
    const nsSize dummyContainerSize;
    ReflowChild(legend, aPresContext, legendDesiredSize, *legendReflowInput, wm,
                LogicalPoint(wm), dummyContainerSize,
                ReflowChildFlags::NoMoveFrame, aStatus);

    if (aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE &&
        !(HasAnyStateBits(NS_FRAME_OUT_OF_FLOW) &&
          aReflowInput.mStyleDisplay->IsAbsolutelyPositionedStyle()) &&
        !prevInFlow && !aReflowInput.mFlags.mIsTopOfPage) {
      // Propagate break-before from the legend to the fieldset.
      if (legend->StyleDisplay()->BreakBefore() ||
          aStatus.IsInlineBreakBefore()) {
        aStatus.SetInlineLineBreakBeforeAndReset();
        return;
      }
      // Honor break-inside:avoid by breaking before instead.
      if (MOZ_UNLIKELY(avoidBreakInside) && !aStatus.IsFullyComplete()) {
        aStatus.SetInlineLineBreakBeforeAndReset();
        return;
      }
    }

    // Calculate the legend's margin-box rectangle.
    legendMargin = legend->GetLogicalUsedMargin(wm);
    mLegendRect = LogicalRect(
        wm, 0, 0, legendDesiredSize.ISize(wm) + legendMargin.IStartEnd(wm),
        legendDesiredSize.BSize(wm) + legendMargin.BStartEnd(wm));
    // We subtract mLegendSpace from inner's content-box block-size below.
    nscoord oldSpace = mLegendSpace;
    mLegendSpace = 0;
    nscoord borderBStart = border.BStart(wm);
    if (!prevInFlow) {
      if (mLegendRect.BSize(wm) > borderBStart) {
        mLegendSpace = mLegendRect.BSize(wm) - borderBStart;
      } else {
        // Calculate the border-box position that would center the legend's
        // border-box within the fieldset border:
        nscoord off = (borderBStart - legendDesiredSize.BSize(wm)) / 2;
        off -= legendMargin.BStart(wm);  // convert to a margin-box position
        if (off > nscoord(0)) {
          // Align the legend to the end if center-aligning it would overflow.
          nscoord overflow = off + mLegendRect.BSize(wm) - borderBStart;
          if (overflow > nscoord(0)) {
            off -= overflow;
          }
          mLegendRect.BStart(wm) += off;
        }
      }
    } else {
      mLegendSpace = mLegendRect.BSize(wm);
    }

    // If mLegendSpace changes then we need to reflow |inner| as well.
    if (mLegendSpace != oldSpace && inner) {
      reflowInner = true;
    }

    FinishReflowChild(legend, aPresContext, legendDesiredSize,
                      legendReflowInput.ptr(), wm, LogicalPoint(wm),
                      dummyContainerSize, ReflowChildFlags::NoMoveFrame);
    EnsureChildContinuation(legend, aStatus);
    if (aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE &&
        !legend->GetWritingMode().IsOrthogonalTo(wm) &&
        legend->StyleDisplay()->BreakAfter() &&
        (!legendReflowInput->mFlags.mIsTopOfPage ||
         mLegendRect.BSize(wm) > 0) &&
        aStatus.IsComplete()) {
      // Pretend that we ran out of space to push children of |inner|.
      // XXX(mats) perhaps pushing the inner frame would be more correct,
      // but we don't support that yet.
      availSize.BSize(wm) = nscoord(0);
      aStatus.Reset();
      aStatus.SetIncomplete();
    }
  } else if (!legend) {
    mLegendRect.SetEmpty();
    mLegendSpace = 0;
  } else {
    // mLegendSpace and mLegendRect haven't changed, but we need
    // the used margin when placing the legend.
    legendMargin = legend->GetLogicalUsedMargin(wm);
  }

  // This containerSize is incomplete as yet: it does not include the size
  // of the |inner| frame itself.
  nsSize containerSize =
      (LogicalSize(wm, 0, mLegendSpace) + border.Size(wm)).GetPhysicalSize(wm);
  if (reflowInner) {
    LogicalSize innerAvailSize = availSize;
    innerAvailSize.ISize(wm) =
        aReflowInput.ComputedSizeWithPadding(wm).ISize(wm);
    nscoord remainingComputedBSize = aReflowInput.ComputedBSize();
    if (prevInFlow && remainingComputedBSize != NS_UNCONSTRAINEDSIZE) {
      // Subtract the consumed BSize associated with the legend.
      for (nsIFrame* prev = prevInFlow; prev; prev = prev->GetPrevInFlow()) {
        auto* prevFieldSet = static_cast<nsFieldSetFrame*>(prev);
        remainingComputedBSize -= prevFieldSet->mLegendSpace;
      }
      remainingComputedBSize = std::max(0, remainingComputedBSize);
    }
    if (innerAvailSize.BSize(wm) != NS_UNCONSTRAINEDSIZE) {
      innerAvailSize.BSize(wm) -=
          std::max(mLegendRect.BSize(wm), border.BStart(wm));
      if (StyleBorder()->mBoxDecorationBreak ==
              StyleBoxDecorationBreak::Clone &&
          (aReflowInput.ComputedBSize() == NS_UNCONSTRAINEDSIZE ||
           remainingComputedBSize +
                   aReflowInput.ComputedLogicalBorderPadding(wm).BStartEnd(
                       wm) >=
               availSize.BSize(wm))) {
        innerAvailSize.BSize(wm) -= border.BEnd(wm);
      }
      innerAvailSize.BSize(wm) = std::max(0, innerAvailSize.BSize(wm));
    }
    ReflowInput kidReflowInput(aPresContext, aReflowInput, inner,
                               innerAvailSize, Nothing(),
                               ReflowInput::InitFlag::CallerWillInit);
    // Override computed padding, in case it's percentage padding
    kidReflowInput.Init(
        aPresContext, Nothing(), Nothing(),
        Some(aReflowInput.ComputedLogicalPadding(inner->GetWritingMode())));

    // Propagate the aspect-ratio flag to |inner| (i.e. the container frame
    // wrapped by nsFieldSetFrame), so we can let |inner|'s reflow code handle
    // automatic content-based minimum.
    // Note: Init() resets this flag, so we have to copy it again here.
    if (aReflowInput.mFlags.mIsBSizeSetByAspectRatio) {
      kidReflowInput.mFlags.mIsBSizeSetByAspectRatio = true;
    }

    if (kidReflowInput.mFlags.mIsTopOfPage) {
      // Prevent break-before from |inner| if we have a legend.
      kidReflowInput.mFlags.mIsTopOfPage = !legend;
    }
    // Our child is "height:100%" but we actually want its height to be reduced
    // by the amount of content-height the legend is eating up, unless our
    // height is unconstrained (in which case the child's will be too).
    if (aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE) {
      kidReflowInput.SetComputedBSize(
          std::max(0, remainingComputedBSize - mLegendSpace));
    }

    if (aReflowInput.ComputedMinBSize() > 0) {
      kidReflowInput.SetComputedMinBSize(
          std::max(0, aReflowInput.ComputedMinBSize() - mLegendSpace));
    }

    if (aReflowInput.ComputedMaxBSize() != NS_UNCONSTRAINEDSIZE) {
      kidReflowInput.SetComputedMaxBSize(
          std::max(0, aReflowInput.ComputedMaxBSize() - mLegendSpace));
    }

    ReflowOutput kidDesiredSize(kidReflowInput);
    NS_ASSERTION(
        kidReflowInput.ComputedPhysicalMargin() == nsMargin(0, 0, 0, 0),
        "Margins on anonymous fieldset child not supported!");
    LogicalPoint pt(wm, border.IStart(wm), border.BStart(wm) + mLegendSpace);

    // We don't know the correct containerSize until we have reflowed |inner|,
    // so we use a dummy value for now; FinishReflowChild will fix the position
    // if necessary.
    const nsSize dummyContainerSize;
    nsReflowStatus status;
    // If our legend needs a continuation then *this* frame will have
    // a continuation as well so we should keep our inner frame continuations
    // too (even if 'inner' ends up being COMPLETE here).  This ensures that
    // our continuation will have a reasonable inline-size.
    ReflowChildFlags flags = aStatus.IsFullyComplete()
                                 ? ReflowChildFlags::Default
                                 : ReflowChildFlags::NoDeleteNextInFlowChild;
    ReflowChild(inner, aPresContext, kidDesiredSize, kidReflowInput, wm, pt,
                dummyContainerSize, flags, status);

    // Honor break-inside:avoid when possible by returning a BreakBefore status.
    if (MOZ_UNLIKELY(avoidBreakInside) && !prevInFlow &&
        !aReflowInput.mFlags.mIsTopOfPage &&
        availSize.BSize(wm) != NS_UNCONSTRAINEDSIZE) {
      if (status.IsInlineBreakBefore() || !status.IsFullyComplete()) {
        aStatus.SetInlineLineBreakBeforeAndReset();
        return;
      }
    }

    // Update containerSize to account for size of the inner frame, so that
    // FinishReflowChild can position it correctly.
    containerSize += kidDesiredSize.PhysicalSize();
    FinishReflowChild(inner, aPresContext, kidDesiredSize, &kidReflowInput, wm,
                      pt, containerSize, ReflowChildFlags::Default);
    EnsureChildContinuation(inner, status);
    aStatus.MergeCompletionStatusFrom(status);
    NS_FRAME_TRACE_REFLOW_OUT("FieldSet::Reflow", aStatus);
  } else if (inner) {
    // |inner| didn't need to be reflowed but we do need to include its size
    // in containerSize.
    containerSize += inner->GetSize();
  } else {
    // No |inner| means it was already complete in an earlier continuation.
    MOZ_ASSERT(prevInFlow, "first-in-flow should always have an inner frame");
    for (nsIFrame* prev = prevInFlow; prev; prev = prev->GetPrevInFlow()) {
      auto* prevFieldSet = static_cast<nsFieldSetFrame*>(prev);
      if (auto* prevInner = prevFieldSet->GetInner()) {
        containerSize += prevInner->GetSize();
        break;
      }
    }
  }

  LogicalRect contentRect(wm);
  if (inner) {
    // We don't support margins on inner, so our content rect is just the
    // inner's border-box. (We don't really care about container size at this
    // point, as we'll figure out the actual positioning later.)
    contentRect = inner->GetLogicalRect(wm, containerSize);
  } else if (prevInFlow) {
    auto size = prevInFlow->GetPaddingRectRelativeToSelf().Size();
    contentRect.ISize(wm) = wm.IsVertical() ? size.height : size.width;
  }

  if (legend) {
    // The legend is positioned inline-wards within the inner's content rect
    // (so that padding on the fieldset affects the legend position).
    LogicalRect innerContentRect = contentRect;
    innerContentRect.Deflate(wm, aReflowInput.ComputedLogicalPadding(wm));
    // If the inner content rect is larger than the legend, we can align the
    // legend.
    if (innerContentRect.ISize(wm) > mLegendRect.ISize(wm)) {
      // NOTE legend @align values are: left/right/center
      // GetLogicalAlign converts left/right to start/end for the given WM.
      // @see HTMLLegendElement::ParseAttribute/LogicalAlign
      auto* legendElement =
          dom::HTMLLegendElement::FromNode(legend->GetContent());
      switch (legendElement->LogicalAlign(wm)) {
        case LegendAlignValue::InlineEnd:
          mLegendRect.IStart(wm) =
              innerContentRect.IEnd(wm) - mLegendRect.ISize(wm);
          break;
        case LegendAlignValue::Center:
          // Note: rounding removed; there doesn't seem to be any need
          mLegendRect.IStart(wm) =
              innerContentRect.IStart(wm) +
              (innerContentRect.ISize(wm) - mLegendRect.ISize(wm)) / 2;
          break;
        case LegendAlignValue::InlineStart:
          mLegendRect.IStart(wm) = innerContentRect.IStart(wm);
          break;
        default:
          MOZ_ASSERT_UNREACHABLE("unexpected GetLogicalAlign value");
      }
    } else {
      // otherwise just start-align it.
      mLegendRect.IStart(wm) = innerContentRect.IStart(wm);
    }

    // place the legend
    LogicalRect actualLegendRect = mLegendRect;
    actualLegendRect.Deflate(wm, legendMargin);
    LogicalPoint actualLegendPos(actualLegendRect.Origin(wm));

    // Note that legend's writing mode may be different from the fieldset's,
    // so we need to convert offsets before applying them to it (bug 1134534).
    LogicalMargin offsets = legendReflowInput->ComputedLogicalOffsets(wm);
    ReflowInput::ApplyRelativePositioning(legend, wm, offsets, &actualLegendPos,
                                          containerSize);

    legend->SetPosition(wm, actualLegendPos, containerSize);
    nsContainerFrame::PositionFrameView(legend);
    nsContainerFrame::PositionChildViews(legend);
  }

  // Skip our block-end border if we're INCOMPLETE.
  if (!aStatus.IsComplete() &&
      StyleBorder()->mBoxDecorationBreak != StyleBoxDecorationBreak::Clone) {
    border.BEnd(wm) = nscoord(0);
  }

  // Return our size and our result.
  LogicalSize finalSize(
      wm, contentRect.ISize(wm) + border.IStartEnd(wm),
      mLegendSpace + border.BStartEnd(wm) + (inner ? inner->BSize(wm) : 0));
  if (Maybe<nscoord> containBSize =
          aReflowInput.mFrame->ContainIntrinsicBSize()) {
    // If we're size-contained in block axis, then we must set finalSize
    // according to contain-intrinsic-block-size, disregarding legend and inner.
    // Note: normally the fieldset's own padding (which we still must honor)
    // would be accounted for as part of inner's size (see kidReflowInput.Init()
    // call above).  So: since we're disregarding sizing information from
    // 'inner', we need to account for that padding ourselves here.
    nscoord contentBoxBSize =
        aReflowInput.ComputedBSize() == NS_UNCONSTRAINEDSIZE
            ? aReflowInput.ApplyMinMaxBSize(*containBSize)
            : aReflowInput.ComputedBSize();
    finalSize.BSize(wm) =
        contentBoxBSize +
        aReflowInput.ComputedLogicalBorderPadding(wm).BStartEnd(wm);
  }

  if (aStatus.IsComplete() &&
      aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE &&
      finalSize.BSize(wm) > aReflowInput.AvailableBSize() &&
      border.BEnd(wm) > 0 && aReflowInput.AvailableBSize() > border.BEnd(wm)) {
    // Our end border doesn't fit but it should fit in the next column/page.
    if (MOZ_UNLIKELY(avoidBreakInside)) {
      aStatus.SetInlineLineBreakBeforeAndReset();
      return;
    } else {
      if (StyleBorder()->mBoxDecorationBreak ==
          StyleBoxDecorationBreak::Slice) {
        finalSize.BSize(wm) -= border.BEnd(wm);
      }
      aStatus.SetIncomplete();
    }
  }

  if (!aStatus.IsComplete()) {
    MOZ_ASSERT(aReflowInput.AvailableBSize() != NS_UNCONSTRAINEDSIZE,
               "must be Complete in an unconstrained available block-size");
    // Stretch our BSize to fill the fragmentainer.
    finalSize.BSize(wm) =
        std::max(finalSize.BSize(wm), aReflowInput.AvailableBSize());
  }
  aDesiredSize.SetSize(wm, finalSize);
  aDesiredSize.SetOverflowAreasToDesiredBounds();

  if (legend) {
    ConsiderChildOverflow(aDesiredSize.mOverflowAreas, legend);
  }
  if (inner) {
    ConsiderChildOverflow(aDesiredSize.mOverflowAreas, inner);
  }

  // Merge overflow container bounds and status.
  aDesiredSize.mOverflowAreas.UnionWith(ocBounds);
  aStatus.MergeCompletionStatusFrom(ocStatus);

  FinishReflowWithAbsoluteFrames(aPresContext, aDesiredSize, aReflowInput,
                                 aStatus);
  InvalidateFrame();
}

void nsFieldSetFrame::SetInitialChildList(ChildListID aListID,
                                          nsFrameList&& aChildList) {
  nsContainerFrame::SetInitialChildList(aListID, std::move(aChildList));
  MOZ_ASSERT(
      aListID != FrameChildListID::Principal || GetInner() || GetLegend(),
      "Setting principal child list should populate our inner frame "
      "or our rendered legend");
}

void nsFieldSetFrame::AppendFrames(ChildListID aListID,
                                   nsFrameList&& aFrameList) {
  MOZ_ASSERT(aListID == FrameChildListID::NoReflowPrincipal &&
                 HasAnyStateBits(NS_FRAME_FIRST_REFLOW),
             "AppendFrames should only be used from "
             "nsCSSFrameConstructor::ConstructFieldSetFrame");
  nsContainerFrame::AppendFrames(aListID, std::move(aFrameList));
  MOZ_ASSERT(GetInner(), "at this point we should have an inner frame");
}

void nsFieldSetFrame::InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
                                   const nsLineList::iterator* aPrevFrameLine,
                                   nsFrameList&& aFrameList) {
  MOZ_ASSERT(
      aListID == FrameChildListID::Principal && !aPrevFrame && !GetLegend(),
      "InsertFrames should only be used to prepend a rendered legend "
      "from nsCSSFrameConstructor::ConstructFramesFromItemList");
  nsContainerFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine,
                                 std::move(aFrameList));
  MOZ_ASSERT(GetLegend());
}

#ifdef DEBUG
void nsFieldSetFrame::RemoveFrame(DestroyContext&, ChildListID, nsIFrame*) {
  MOZ_CRASH("nsFieldSetFrame::RemoveFrame not supported");
}
#endif

#ifdef ACCESSIBILITY
a11y::AccType nsFieldSetFrame::AccessibleType() {
  return a11y::eHTMLGroupboxType;
}
#endif

BaselineSharingGroup nsFieldSetFrame::GetDefaultBaselineSharingGroup() const {
  switch (StyleDisplay()->DisplayInside()) {
    case mozilla::StyleDisplayInside::Grid:
    case mozilla::StyleDisplayInside::Flex:
      return BaselineSharingGroup::First;
    default:
      return BaselineSharingGroup::Last;
  }
}

nscoord nsFieldSetFrame::SynthesizeFallbackBaseline(
    WritingMode aWM, BaselineSharingGroup aBaselineGroup) const {
  return Baseline::SynthesizeBOffsetFromMarginBox(this, aWM, aBaselineGroup);
}

Maybe<nscoord> nsFieldSetFrame::GetNaturalBaselineBOffset(
    WritingMode aWM, BaselineSharingGroup aBaselineGroup,
    BaselineExportContext aExportContext) const {
  if (StyleDisplay()->IsContainLayout()) {
    // If we are layout-contained, our child 'inner' should not
    // affect how we calculate our baseline.
    return Nothing{};
  }
  nsIFrame* inner = GetInner();
  if (MOZ_UNLIKELY(!inner)) {
    return Nothing{};
  }
  MOZ_ASSERT(!inner->GetWritingMode().IsOrthogonalTo(aWM));
  const auto result =
      inner->GetNaturalBaselineBOffset(aWM, aBaselineGroup, aExportContext);
  if (!result) {
    return Nothing{};
  }
  nscoord innerBStart = inner->BStart(aWM, GetSize());
  if (aBaselineGroup == BaselineSharingGroup::First) {
    return Some(*result + innerBStart);
  }
  return Some(*result + BSize(aWM) - (innerBStart + inner->BSize(aWM)));
}

ScrollContainerFrame* nsFieldSetFrame::GetScrollTargetFrame() const {
  return do_QueryFrame(GetInner());
}

void nsFieldSetFrame::AppendDirectlyOwnedAnonBoxes(
    nsTArray<OwnedAnonBox>& aResult) {
  if (nsIFrame* kid = GetInner()) {
    aResult.AppendElement(OwnedAnonBox(kid));
  }
}

void nsFieldSetFrame::EnsureChildContinuation(nsIFrame* aChild,
                                              const nsReflowStatus& aStatus) {
  MOZ_ASSERT(aChild == GetLegend() || aChild == GetInner(),
             "unexpected child frame");
  nsIFrame* nif = aChild->GetNextInFlow();
  if (aStatus.IsFullyComplete()) {
    if (nif) {
      // NOTE: we want to avoid our DEBUG version of RemoveFrame above.
      DestroyContext context(PresShell());
      nsContainerFrame::RemoveFrame(context,
                                    FrameChildListID::NoReflowPrincipal, nif);
      MOZ_ASSERT(!aChild->GetNextInFlow());
    }
  } else {
    nsFrameList nifs;
    if (!nif) {
      auto* fc = PresShell()->FrameConstructor();
      nif = fc->CreateContinuingFrame(aChild, this);
      if (aStatus.IsOverflowIncomplete()) {
        nif->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
      }
      nifs = nsFrameList(nif, nif);
    } else {
      // Steal all nifs and push them again in case they are currently on
      // the wrong list.
      for (nsIFrame* n = nif; n; n = n->GetNextInFlow()) {
        n->GetParent()->StealFrame(n);
        nifs.AppendFrame(this, n);
        if (aStatus.IsOverflowIncomplete()) {
          n->AddStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
        } else {
          n->RemoveStateBits(NS_FRAME_IS_OVERFLOW_CONTAINER);
        }
      }
    }
    if (aStatus.IsOverflowIncomplete()) {
      if (nsFrameList* eoc = GetExcessOverflowContainers()) {
        eoc->AppendFrames(nullptr, std::move(nifs));
      } else {
        SetExcessOverflowContainers(std::move(nifs));
      }
    } else {
      if (nsFrameList* oc = GetOverflowFrames()) {
        oc->AppendFrames(nullptr, std::move(nifs));
      } else {
        SetOverflowFrames(std::move(nifs));
      }
    }
  }
}

quality96%

¤ Dauer der Verarbeitung: 0.20 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.