| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "third_party/blink/renderer/core/layout/ng/ng_block_node.h" |
| |
| #include <memory> |
| |
| #include "third_party/blink/renderer/core/frame/local_frame_view.h" |
| #include "third_party/blink/renderer/core/layout/layout_block_flow.h" |
| #include "third_party/blink/renderer/core/layout/layout_multi_column_flow_thread.h" |
| #include "third_party/blink/renderer/core/layout/layout_multi_column_set.h" |
| #include "third_party/blink/renderer/core/layout/min_max_size.h" |
| #include "third_party/blink/renderer/core/layout/ng/inline/ng_inline_node.h" |
| #include "third_party/blink/renderer/core/layout/ng/legacy_layout_tree_walking.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_block_break_token.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_block_layout_algorithm.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_box_fragment.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_column_layout_algorithm.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_constraint_space.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_constraint_space_builder.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_flex_layout_algorithm.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_fragment_builder.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_fragmentation_utils.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_layout_input_node.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_layout_result.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_layout_utils.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_length_utils.h" |
| #include "third_party/blink/renderer/core/layout/ng/ng_page_layout_algorithm.h" |
| #include "third_party/blink/renderer/core/layout/shapes/shape_outside_info.h" |
| #include "third_party/blink/renderer/core/paint/paint_layer.h" |
| #include "third_party/blink/renderer/platform/runtime_enabled_features.h" |
| #include "third_party/blink/renderer/platform/text/writing_mode.h" |
| |
| namespace blink { |
| |
| namespace { |
| |
| inline LayoutMultiColumnFlowThread* GetFlowThread(const LayoutBox& box) { |
| if (!box.IsLayoutBlockFlow()) |
| return nullptr; |
| return ToLayoutBlockFlow(box).MultiColumnFlowThread(); |
| } |
| |
| #define WITH_ALGORITHM(ret, func, argdecl, args) \ |
| ret func##WithAlgorithm(NGBlockNode node, const NGConstraintSpace& space, \ |
| NGBreakToken* break_token, argdecl) { \ |
| auto* token = ToNGBlockBreakToken(break_token); \ |
| const ComputedStyle& style = node.Style(); \ |
| if (style.IsDisplayFlexibleBox()) \ |
| return NGFlexLayoutAlgorithm(node, space, token).func args; \ |
| /* If there's a legacy layout box, we can only do block fragmentation if \ |
| * we would have done block fragmentation with the legacy engine. \ |
| * Otherwise writing data back into the legacy tree will fail. Look for \ |
| * the flow thread. */ \ |
| if (GetFlowThread(*node.GetLayoutBox())) { \ |
| if (style.IsOverflowPaged()) \ |
| return NGPageLayoutAlgorithm(node, space, token).func args; \ |
| if (style.SpecifiesColumns()) \ |
| return NGColumnLayoutAlgorithm(node, space, token).func args; \ |
| NOTREACHED(); \ |
| } \ |
| return NGBlockLayoutAlgorithm(node, space, token).func args; \ |
| } |
| |
| WITH_ALGORITHM(scoped_refptr<NGLayoutResult>, Layout, void*, ()) |
| WITH_ALGORITHM(base::Optional<MinMaxSize>, |
| ComputeMinMaxSize, |
| MinMaxSizeInput input, |
| (input)) |
| |
| #undef WITH_ALGORITHM |
| |
| bool IsFloatFragment(const NGPhysicalFragment& fragment) { |
| const LayoutObject* layout_object = fragment.GetLayoutObject(); |
| return layout_object && layout_object->IsFloating() && fragment.IsBox(); |
| } |
| |
| void UpdateLegacyMultiColumnFlowThread( |
| NGBlockNode node, |
| LayoutMultiColumnFlowThread* flow_thread, |
| const NGConstraintSpace& constraint_space, |
| const NGPhysicalBoxFragment& fragment) { |
| WritingMode writing_mode = constraint_space.GetWritingMode(); |
| LayoutUnit flow_end; |
| LayoutUnit column_block_size; |
| bool has_processed_first_child = false; |
| |
| // Stitch the columns together. |
| for (const scoped_refptr<NGPhysicalFragment> child : fragment.Children()) { |
| NGFragment child_fragment(writing_mode, *child); |
| flow_end += child_fragment.BlockSize(); |
| // Non-uniform fragmentainer widths not supported by legacy layout. |
| DCHECK(!has_processed_first_child || |
| flow_thread->LogicalWidth() == child_fragment.InlineSize()); |
| if (!has_processed_first_child) { |
| // The offset of the flow thread should be the same as that of the first |
| // first column. |
| flow_thread->SetX(child->Offset().left); |
| flow_thread->SetY(child->Offset().top); |
| flow_thread->SetLogicalWidth(child_fragment.InlineSize()); |
| column_block_size = child_fragment.BlockSize(); |
| has_processed_first_child = true; |
| } |
| } |
| |
| if (LayoutMultiColumnSet* column_set = flow_thread->FirstMultiColumnSet()) { |
| NGFragment logical_fragment(writing_mode, fragment); |
| auto border_scrollbar_padding = |
| CalculateBorderScrollbarPadding(constraint_space, node); |
| |
| column_set->SetLogicalLeft(border_scrollbar_padding.inline_start); |
| column_set->SetLogicalTop(border_scrollbar_padding.block_start); |
| column_set->SetLogicalWidth(logical_fragment.InlineSize() - |
| border_scrollbar_padding.InlineSum()); |
| column_set->SetLogicalHeight(column_block_size); |
| column_set->EndFlow(flow_end); |
| } |
| // TODO(mstensho): Update all column boxes, not just the first column set |
| // (like we do above). This is needed to support column-span:all. |
| |
| flow_thread->UpdateFromNG(); |
| flow_thread->ValidateColumnSets(); |
| flow_thread->SetLogicalHeight(flow_end); |
| flow_thread->UpdateAfterLayout(); |
| flow_thread->ClearNeedsLayout(); |
| } |
| |
| // For inline children, NG painters handles fragments directly, but there are |
| // some cases where we need to copy data to the LayoutObject tree. This function |
| // handles such cases. |
| void CopyFragmentDataToLayoutBoxForInlineChildren( |
| const NGPhysicalContainerFragment& container, |
| LayoutUnit initial_container_width, |
| bool initial_container_is_flipped, |
| NGPhysicalOffset offset = {}) { |
| for (const auto& child : container.Children()) { |
| if (child->IsContainer()) { |
| NGPhysicalOffset child_offset = offset + child->Offset(); |
| |
| // Replaced elements and inline blocks need Location() set relative to |
| // their block container. |
| LayoutObject* layout_object = child->GetLayoutObject(); |
| if (layout_object && layout_object->IsBox()) { |
| LayoutBox& layout_box = ToLayoutBox(*layout_object); |
| NGPhysicalOffset maybe_flipped_offset = child_offset; |
| if (initial_container_is_flipped) { |
| maybe_flipped_offset.left = initial_container_width - |
| child->Size().width - |
| maybe_flipped_offset.left; |
| } |
| layout_box.SetLocation(maybe_flipped_offset.ToLayoutPoint()); |
| } |
| |
| // The Location() of inline LayoutObject is relative to the |
| // LayoutBlockFlow. If |child| is a block layout root (e.g., inline block, |
| // float, etc.), it creates another inline formatting context. Do not copy |
| // to its descendants in this case. |
| if (!child->IsBlockLayoutRoot()) { |
| CopyFragmentDataToLayoutBoxForInlineChildren( |
| ToNGPhysicalContainerFragment(*child), initial_container_width, |
| initial_container_is_flipped, child_offset); |
| } |
| } |
| } |
| } |
| |
| NGConstraintSpaceBuilder CreateConstraintSpaceBuilderForMinMax( |
| NGBlockNode node) { |
| return NGConstraintSpaceBuilder(node.Style().GetWritingMode(), |
| node.InitialContainingBlockSize()) |
| .SetTextDirection(node.Style().Direction()) |
| .SetIsIntermediateLayout(true) |
| .SetIsNewFormattingContext(node.CreatesNewFormattingContext()) |
| .SetFloatsBfcOffset(NGBfcOffset()); |
| } |
| |
| } // namespace |
| |
| NGBlockNode::NGBlockNode(LayoutBox* box) : NGLayoutInputNode(box, kBlock) {} |
| |
| scoped_refptr<NGLayoutResult> NGBlockNode::Layout( |
| const NGConstraintSpace& constraint_space, |
| NGBreakToken* break_token) { |
| // Use the old layout code and synthesize a fragment. |
| if (!CanUseNewLayout()) { |
| return RunOldLayout(constraint_space); |
| } |
| |
| LayoutBlockFlow* block_flow = |
| box_->IsLayoutNGMixin() ? ToLayoutBlockFlow(box_) : nullptr; |
| NGLayoutInputNode first_child = FirstChild(); |
| scoped_refptr<NGLayoutResult> layout_result; |
| if (box_->IsLayoutNGMixin()) { |
| layout_result = ToLayoutBlockFlow(box_)->CachedLayoutResult( |
| constraint_space, break_token); |
| if (layout_result) { |
| // TODO(layoutng): Figure out why these two call can't be inside the |
| // !constraint_space.IsIntermediateLayout() block below. |
| UpdateShapeOutsideInfoIfNeeded( |
| constraint_space.PercentageResolutionSize().inline_size); |
| // We may need paint invalidation even if we can reuse layout, as our |
| // paint offset/visual rect may have changed due to relative |
| // positioning changes. Otherwise we fail fast/css/ |
| // fast/css/relative-positioned-block-with-inline-ancestor-and-parent |
| // -dynamic.html |
| // TODO(layoutng): See if we can optimize this. When we natively |
| // support relative positioning in NG we can probably remove this, |
| box_->SetMayNeedPaintInvalidation(); |
| |
| // We have to re-set the cached result here, because it is used for |
| // LayoutNGMixin::CurrentFragment and therefore has to be up-to-date. |
| // In particular, that fragment would have an incorrect offset if we |
| // don't re-set the result here. |
| ToLayoutBlockFlow(box_)->SetCachedLayoutResult( |
| constraint_space, break_token, layout_result); |
| if (!constraint_space.IsIntermediateLayout()) { |
| block_flow->ClearPaintFragment(); |
| if (first_child && first_child.IsInline()) |
| block_flow->SetPaintFragment(layout_result->PhysicalFragment()); |
| } |
| return layout_result; |
| } |
| } |
| |
| // This follows the code from LayoutBox::UpdateLogicalWidth |
| if (box_->NeedsPreferredWidthsRecalculation() && |
| !box_->PreferredLogicalWidthsDirty()) { |
| // Laying out this object means that its containing block is also being |
| // laid out. This object is special, in that its min/max widths depend on |
| // the ancestry (min/max width calculation should ideally be strictly |
| // bottom-up, but that's not always the case), so since the containing |
| // block size may have changed, we need to recalculate the min/max widths |
| // of this object, and every child that has the same issue, recursively. |
| box_->SetPreferredLogicalWidthsDirty(kMarkOnlyThis); |
| // Since all this takes place during actual layout, instead of being part |
| // of min/max the width calculation machinery, we need to enter said |
| // machinery here, to make sure that what was dirtied is actualy |
| // recalculated. Leaving things dirty would mean that any subsequent |
| // dirtying of descendants would fail. |
| box_->ComputePreferredLogicalWidths(); |
| } |
| |
| layout_result = LayoutWithAlgorithm(*this, constraint_space, break_token, |
| /* ignored */ nullptr); |
| if (block_flow) { |
| block_flow->SetCachedLayoutResult(constraint_space, break_token, |
| layout_result); |
| if (layout_result->Status() == NGLayoutResult::kSuccess && |
| !constraint_space.IsIntermediateLayout()) |
| block_flow->ClearPaintFragment(); |
| } |
| |
| if (IsBlockLayoutComplete(constraint_space, *layout_result)) { |
| DCHECK(layout_result->PhysicalFragment()); |
| |
| if (block_flow && first_child && first_child.IsInline()) { |
| NGBoxStrut scrollbars = GetScrollbarSizes(); |
| CopyFragmentDataToLayoutBoxForInlineChildren( |
| ToNGPhysicalBoxFragment(*layout_result->PhysicalFragment()), |
| layout_result->PhysicalFragment()->Size().width - |
| scrollbars.block_start, |
| Style().IsFlippedBlocksWritingMode()); |
| |
| block_flow->SetPaintFragment(layout_result->PhysicalFragment()); |
| } |
| |
| // TODO(kojii): Even when we paint fragments, there seem to be some data we |
| // need to copy to LayoutBox. Review if we can minimize the copy. |
| CopyFragmentDataToLayoutBox(constraint_space, *layout_result); |
| } |
| |
| return layout_result; |
| } |
| |
| MinMaxSize NGBlockNode::ComputeMinMaxSize( |
| WritingMode container_writing_mode, |
| const MinMaxSizeInput& input, |
| const NGConstraintSpace* constraint_space) { |
| bool is_orthogonal_flow_root = |
| !IsParallelWritingMode(container_writing_mode, Style().GetWritingMode()); |
| |
| MinMaxSize sizes; |
| // If we're orthogonal, we have to run layout to compute the sizes. However, |
| // if we're outside of layout, we can't do that. This can happen on Mac. |
| if (!CanUseNewLayout() || |
| (is_orthogonal_flow_root && !box_->GetFrameView()->IsInPerformLayout())) { |
| return ComputeMinMaxSizeFromLegacy(); |
| } |
| |
| scoped_refptr<NGConstraintSpace> zero_constraint_space = |
| CreateConstraintSpaceBuilderForMinMax(*this).ToConstraintSpace( |
| Style().GetWritingMode()); |
| |
| if (!constraint_space) { |
| // Using the zero-sized constraint space when measuring for an orthogonal |
| // flow root isn't going to give the right result. |
| DCHECK(!is_orthogonal_flow_root); |
| |
| constraint_space = zero_constraint_space.get(); |
| } |
| |
| if (is_orthogonal_flow_root) { |
| scoped_refptr<NGLayoutResult> layout_result = Layout(*constraint_space); |
| DCHECK_EQ(layout_result->Status(), NGLayoutResult::kSuccess); |
| NGBoxFragment fragment( |
| container_writing_mode, |
| ToNGPhysicalBoxFragment(*layout_result->PhysicalFragment())); |
| sizes.min_size = sizes.max_size = fragment.Size().inline_size; |
| return sizes; |
| } |
| |
| base::Optional<MinMaxSize> maybe_sizes = |
| ComputeMinMaxSizeWithAlgorithm(*this, *constraint_space, |
| /* break token */ nullptr, input); |
| if (maybe_sizes.has_value()) |
| return *maybe_sizes; |
| |
| if (!box_->GetFrameView()->IsInPerformLayout()) { |
| // We can't synthesize these using Layout() if we're not in PerformLayout. |
| // This situation can happen on mac. Fall back to legacy instead. |
| return ComputeMinMaxSizeFromLegacy(); |
| } |
| |
| // Have to synthesize this value. |
| scoped_refptr<NGLayoutResult> layout_result = Layout(*zero_constraint_space); |
| NGBoxFragment min_fragment( |
| container_writing_mode, |
| ToNGPhysicalBoxFragment(*layout_result->PhysicalFragment())); |
| sizes.min_size = min_fragment.Size().inline_size; |
| |
| // Now, redo with infinite space for max_content |
| scoped_refptr<NGConstraintSpace> infinite_constraint_space = |
| CreateConstraintSpaceBuilderForMinMax(*this) |
| .SetAvailableSize({LayoutUnit::Max(), LayoutUnit()}) |
| .SetPercentageResolutionSize({LayoutUnit(), LayoutUnit()}) |
| .ToConstraintSpace(Style().GetWritingMode()); |
| |
| layout_result = Layout(*infinite_constraint_space); |
| NGBoxFragment max_fragment( |
| container_writing_mode, |
| ToNGPhysicalBoxFragment(*layout_result->PhysicalFragment())); |
| sizes.max_size = max_fragment.Size().inline_size; |
| return sizes; |
| } |
| |
| MinMaxSize NGBlockNode::ComputeMinMaxSizeFromLegacy() const { |
| // TODO(layout-ng): This could be somewhat optimized by directly calling |
| // computeIntrinsicLogicalWidths, but that function is currently private. |
| // Consider doing that if this becomes a performance issue. |
| MinMaxSize sizes; |
| sizes.min_size = |
| box_->ComputeLogicalWidthUsing(kMainOrPreferredSize, Length(kMinContent), |
| LayoutUnit(), box_->ContainingBlock()); |
| sizes.max_size = |
| box_->ComputeLogicalWidthUsing(kMainOrPreferredSize, Length(kMaxContent), |
| LayoutUnit(), box_->ContainingBlock()); |
| return sizes; |
| } |
| |
| NGBoxStrut NGBlockNode::GetScrollbarSizes() const { |
| NGPhysicalBoxStrut sizes; |
| const ComputedStyle& style = box_->StyleRef(); |
| if (!style.IsOverflowVisible()) { |
| LayoutUnit vertical = LayoutUnit(box_->VerticalScrollbarWidth()); |
| LayoutUnit horizontal = LayoutUnit(box_->HorizontalScrollbarHeight()); |
| sizes.bottom = horizontal; |
| if (box_->ShouldPlaceBlockDirectionScrollbarOnLogicalLeft()) |
| sizes.left = vertical; |
| else |
| sizes.right = vertical; |
| } |
| return sizes.ConvertToLogical(style.GetWritingMode(), style.Direction()); |
| } |
| |
| NGLayoutInputNode NGBlockNode::NextSibling() const { |
| LayoutObject* next_sibling = box_->NextSibling(); |
| if (next_sibling) { |
| DCHECK(!next_sibling->IsInline()); |
| return NGBlockNode(ToLayoutBox(next_sibling)); |
| } |
| return nullptr; |
| } |
| |
| NGLayoutInputNode NGBlockNode::FirstChild() const { |
| auto* block = ToLayoutBlock(box_); |
| auto* child = GetLayoutObjectForFirstChildNode(block); |
| if (!child) |
| return nullptr; |
| if (AreNGBlockFlowChildrenInline(block)) |
| return NGInlineNode(ToLayoutBlockFlow(block)); |
| return NGBlockNode(ToLayoutBox(child)); |
| } |
| |
| bool NGBlockNode::CanUseNewLayout(const LayoutBox& box) { |
| DCHECK(RuntimeEnabledFeatures::LayoutNGEnabled()); |
| if (box.StyleRef().ForceLegacyLayout()) |
| return false; |
| |
| // When the style has |ForceLegacyLayout|, it's usually not LayoutNGMixin, |
| // but anonymous block can be. |
| return box.IsLayoutNGMixin() || box.IsLayoutNGFlexibleBox(); |
| } |
| |
| bool NGBlockNode::CanUseNewLayout() const { |
| return CanUseNewLayout(*box_); |
| } |
| |
| String NGBlockNode::ToString() const { |
| return String::Format("NGBlockNode: '%s'", |
| GetLayoutBox()->DebugName().Ascii().data()); |
| } |
| |
| void NGBlockNode::CopyFragmentDataToLayoutBox( |
| const NGConstraintSpace& constraint_space, |
| const NGLayoutResult& layout_result) { |
| DCHECK(layout_result.PhysicalFragment()); |
| if (constraint_space.IsIntermediateLayout()) |
| return; |
| |
| const NGPhysicalBoxFragment& physical_fragment = |
| ToNGPhysicalBoxFragment(*layout_result.PhysicalFragment()); |
| |
| NGBoxFragment fragment(constraint_space.GetWritingMode(), physical_fragment); |
| NGLogicalSize fragment_logical_size = fragment.Size(); |
| // For each fragment we process, we'll accumulate the logical height and |
| // logical intrinsic content box height. We reset it at the first fragment, |
| // and accumulate at each method call for fragments belonging to the same |
| // layout object. Logical width will only be set at the first fragment and is |
| // expected to remain the same throughout all subsequent fragments, since |
| // legacy layout doesn't support non-uniform fragmentainer widths. |
| LayoutUnit logical_height; |
| LayoutUnit intrinsic_content_logical_height; |
| if (IsFirstFragment(constraint_space, physical_fragment)) { |
| box_->SetLogicalWidth(fragment_logical_size.inline_size); |
| } else { |
| DCHECK_EQ(box_->LogicalWidth(), fragment_logical_size.inline_size) |
| << "Variable fragment inline size not supported"; |
| logical_height = box_->LogicalHeight(); |
| intrinsic_content_logical_height = box_->IntrinsicContentLogicalHeight(); |
| } |
| logical_height += fragment_logical_size.block_size; |
| intrinsic_content_logical_height += layout_result.IntrinsicBlockSize(); |
| |
| NGBoxStrut borders = ComputeBorders(constraint_space, Style()); |
| NGBoxStrut scrollbars = GetScrollbarSizes(); |
| NGBoxStrut padding = ComputePadding(constraint_space, Style()); |
| NGBoxStrut border_scrollbar_padding = borders + scrollbars + padding; |
| |
| if (IsLastFragment(physical_fragment)) |
| intrinsic_content_logical_height -= border_scrollbar_padding.BlockSum(); |
| box_->SetLogicalHeight(logical_height); |
| box_->SetIntrinsicContentLogicalHeight(intrinsic_content_logical_height); |
| // TODO(mstensho): This should always be done by the parent algorithm, since |
| // we may have auto margins, which only the parent is able to resolve. Remove |
| // the following line when all layout modes do this properly. |
| box_->SetMargin(ComputePhysicalMargins(constraint_space, Style())); |
| |
| LayoutMultiColumnFlowThread* flow_thread = GetFlowThread(*box_); |
| if (flow_thread) { |
| PlaceChildrenInFlowThread(constraint_space, physical_fragment); |
| } else { |
| NGPhysicalOffset offset_from_start; |
| if (constraint_space.HasBlockFragmentation()) { |
| // Need to include any block space that this container has used in |
| // previous fragmentainers. The offset of children will be relative to |
| // the container, in flow thread coordinates, i.e. the model where |
| // everything is represented as one single strip, rather than being |
| // sliced and translated into columns. |
| |
| // TODO(mstensho): writing modes |
| offset_from_start.top = |
| PreviouslyUsedBlockSpace(constraint_space, physical_fragment); |
| } |
| PlaceChildrenInLayoutBox(constraint_space, physical_fragment, |
| offset_from_start); |
| } |
| |
| if (box_->IsLayoutBlock() && IsLastFragment(physical_fragment)) { |
| LayoutBlock* block = ToLayoutBlock(box_); |
| LayoutUnit intrinsic_block_size = layout_result.IntrinsicBlockSize(); |
| if (constraint_space.HasBlockFragmentation()) { |
| intrinsic_block_size += |
| PreviouslyUsedBlockSpace(constraint_space, physical_fragment); |
| } |
| block->LayoutPositionedObjects(/* relayout_children */ false); |
| |
| if (flow_thread) { |
| UpdateLegacyMultiColumnFlowThread(*this, flow_thread, constraint_space, |
| physical_fragment); |
| } |
| |
| // |ComputeOverflow()| below calls |AddOverflowFromChildren()|, which |
| // computes visual overflow from |RootInlineBox| if |ChildrenInline()| |
| block->ComputeOverflow(intrinsic_block_size - borders.block_end - |
| scrollbars.BlockSum()); |
| } |
| |
| box_->UpdateAfterLayout(); |
| box_->ClearNeedsLayout(); |
| |
| UpdateShapeOutsideInfoIfNeeded( |
| constraint_space.PercentageResolutionSize().inline_size); |
| |
| if (box_->IsLayoutBlockFlow()) { |
| LayoutBlockFlow* block_flow = ToLayoutBlockFlow(box_); |
| block_flow->UpdateIsSelfCollapsing(); |
| |
| if (block_flow->CreatesNewFormattingContext()) |
| block_flow->AddOverflowFromFloats(); |
| } |
| } |
| |
| void NGBlockNode::PlaceChildrenInLayoutBox( |
| const NGConstraintSpace& constraint_space, |
| const NGPhysicalBoxFragment& physical_fragment, |
| const NGPhysicalOffset& offset_from_start) { |
| for (const auto& child_fragment : physical_fragment.Children()) { |
| auto* child_object = child_fragment->GetLayoutObject(); |
| DCHECK(child_fragment->IsPlaced()); |
| |
| // Skip any line-boxes we have as children, this is handled within |
| // NGInlineNode at the moment. |
| if (!child_fragment->IsBox()) |
| continue; |
| |
| const auto& box_fragment = *ToNGPhysicalBoxFragment(child_fragment.get()); |
| if (IsFirstFragment(constraint_space, box_fragment)) |
| CopyChildFragmentPosition(box_fragment, offset_from_start); |
| |
| if (child_object->IsLayoutBlockFlow()) |
| ToLayoutBlockFlow(child_object)->AddOverflowFromFloats(); |
| } |
| } |
| |
| void NGBlockNode::PlaceChildrenInFlowThread( |
| const NGConstraintSpace& constraint_space, |
| const NGPhysicalBoxFragment& physical_fragment) { |
| LayoutUnit flowthread_offset; |
| for (const auto& child : physical_fragment.Children()) { |
| // Each anonymous child of a multicol container constitutes one column. |
| DCHECK(child->IsPlaced()); |
| DCHECK(child->GetLayoutObject() == box_); |
| |
| // TODO(mstensho): writing modes |
| NGPhysicalOffset offset(LayoutUnit(), flowthread_offset); |
| |
| // Position each child node in the first column that they occur, relatively |
| // to the block-start of the flow thread. |
| const auto* column = ToNGPhysicalBoxFragment(child.get()); |
| PlaceChildrenInLayoutBox(constraint_space, *column, offset); |
| const auto* token = ToNGBlockBreakToken(column->BreakToken()); |
| flowthread_offset = token->UsedBlockSize(); |
| } |
| } |
| |
| // Copies data back to the legacy layout tree for a given child fragment. |
| void NGBlockNode::CopyChildFragmentPosition( |
| const NGPhysicalFragment& fragment, |
| const NGPhysicalOffset& additional_offset) { |
| LayoutBox* layout_box = ToLayoutBox(fragment.GetLayoutObject()); |
| if (!layout_box) |
| return; |
| |
| DCHECK(layout_box->Parent()) << "Should be called on children only."; |
| |
| // The containing block of |layout_box| on the legacy layout side is normally |
| // |box_|, but this is not an invariant. Among other things, it does not apply |
| // to list item markers and multicol container children. Multicol containiner |
| // children typically have their flow thread (not the multicol container |
| // itself) as their containing block, and we need to use the right containing |
| // block for inserting floats, flipping for writing modes, etc. |
| LayoutBlock* containing_block = layout_box->ContainingBlock(); |
| |
| // LegacyLayout flips vertical-rl horizontal coordinates before paint. |
| // NGLayout flips X location for LegacyLayout compatibility. horizontal_offset |
| // will be the offset from the left edge of the container to the left edge of |
| // the layout object, except when in vertical-rl: Then it will be the offset |
| // from the right edge of the container to the right edge of the layout |
| // object. |
| LayoutUnit horizontal_offset = |
| fragment.Offset().left + additional_offset.left; |
| bool has_flipped_x_axis = |
| containing_block->StyleRef().IsFlippedBlocksWritingMode(); |
| if (has_flipped_x_axis) { |
| NGBoxStrut scrollbars = GetScrollbarSizes(); |
| LayoutUnit container_width = |
| containing_block->Size().Width() - scrollbars.block_start; |
| horizontal_offset = |
| container_width - horizontal_offset - fragment.Size().width; |
| } |
| layout_box->SetX(horizontal_offset); |
| layout_box->SetY(fragment.Offset().top + additional_offset.top); |
| |
| // Floats need an associated FloatingObject for painting. |
| if (IsFloatFragment(fragment) && containing_block->IsLayoutBlockFlow()) { |
| FloatingObject* floating_object = |
| ToLayoutBlockFlow(containing_block)->InsertFloatingObject(*layout_box); |
| floating_object->SetIsInPlacedTree(false); |
| LayoutUnit horizontal_margin_edge_offset = horizontal_offset; |
| if (has_flipped_x_axis) |
| horizontal_margin_edge_offset -= layout_box->MarginRight(); |
| else |
| horizontal_margin_edge_offset -= layout_box->MarginLeft(); |
| floating_object->SetX(horizontal_margin_edge_offset); |
| floating_object->SetY(fragment.Offset().top + additional_offset.top - |
| layout_box->MarginTop()); |
| floating_object->SetIsPlaced(true); |
| floating_object->SetIsInPlacedTree(true); |
| } |
| } |
| |
| bool NGBlockNode::IsInlineLevel() const { |
| return GetLayoutBox()->IsInline(); |
| } |
| |
| bool NGBlockNode::IsAtomicInlineLevel() const { |
| // LayoutObject::IsAtomicInlineLevel() returns true for e.g., <img |
| // style="display: block">. Check IsInline() as well. |
| return GetLayoutBox()->IsAtomicInlineLevel() && GetLayoutBox()->IsInline(); |
| } |
| |
| scoped_refptr<NGLayoutResult> NGBlockNode::LayoutAtomicInline( |
| const NGConstraintSpace& parent_constraint_space, |
| FontBaseline baseline_type, |
| bool use_first_line_style) { |
| NGConstraintSpaceBuilder space_builder(parent_constraint_space); |
| space_builder.SetUseFirstLineStyle(use_first_line_style); |
| |
| // Request to compute baseline during the layout, except when we know the box |
| // would synthesize box-baseline. |
| if (NGBaseline::ShouldPropagateBaselines(GetLayoutBox())) { |
| space_builder.AddBaselineRequest( |
| {NGBaselineAlgorithmType::kAtomicInline, baseline_type}); |
| } |
| |
| const ComputedStyle& style = Style(); |
| scoped_refptr<NGConstraintSpace> constraint_space = |
| space_builder.SetIsNewFormattingContext(true) |
| .SetIsShrinkToFit(true) |
| .SetAvailableSize(parent_constraint_space.AvailableSize()) |
| .SetPercentageResolutionSize( |
| parent_constraint_space.PercentageResolutionSize()) |
| .SetTextDirection(style.Direction()) |
| .ToConstraintSpace(style.GetWritingMode()); |
| return Layout(*constraint_space); |
| } |
| |
| scoped_refptr<NGLayoutResult> NGBlockNode::RunOldLayout( |
| const NGConstraintSpace& constraint_space) { |
| // This is an exit-point from LayoutNG to the legacy engine. This means that |
| // we need to be at a formatting context boundary, since NG and legacy don't |
| // cooperate on e.g. margin collapsing. |
| DCHECK(!box_->IsLayoutBlock() || |
| ToLayoutBlock(box_)->CreatesNewFormattingContext()); |
| |
| WritingMode writing_mode = Style().GetWritingMode(); |
| const NGConstraintSpace* old_space = |
| box_->IsLayoutNGMixin() ? ToLayoutBlockFlow(box_)->CachedConstraintSpace() |
| : nullptr; |
| if (!old_space || box_->NeedsLayout() || *old_space != constraint_space) { |
| LayoutUnit inline_size = |
| Style().LogicalWidth().IsPercent() |
| ? constraint_space.PercentageResolutionSize().inline_size |
| : constraint_space.AvailableSize().inline_size; |
| LayoutUnit block_size = |
| Style().LogicalHeight().IsPercent() |
| ? constraint_space.PercentageResolutionSize().block_size |
| : constraint_space.AvailableSize().block_size; |
| LayoutObject* containing_block = box_->ContainingBlock(); |
| bool parallel_writing_mode; |
| if (!containing_block) { |
| parallel_writing_mode = true; |
| } else { |
| parallel_writing_mode = IsParallelWritingMode( |
| containing_block->StyleRef().GetWritingMode(), writing_mode); |
| } |
| if (parallel_writing_mode) { |
| box_->SetOverrideContainingBlockContentLogicalWidth(inline_size); |
| box_->SetOverrideContainingBlockContentLogicalHeight(block_size); |
| } else { |
| // OverrideContainingBlock should be in containing block writing mode. |
| box_->SetOverrideContainingBlockContentLogicalWidth(block_size); |
| box_->SetOverrideContainingBlockContentLogicalHeight(inline_size); |
| } |
| |
| if (constraint_space.IsFixedSizeInline()) { |
| box_->SetOverrideLogicalWidth( |
| constraint_space.AvailableSize().inline_size); |
| } |
| if (constraint_space.IsFixedSizeBlock()) { |
| box_->SetOverrideLogicalHeight( |
| constraint_space.AvailableSize().block_size); |
| } |
| box_->ComputeAndSetBlockDirectionMargins(box_->ContainingBlock()); |
| |
| if (box_->IsLayoutNGMixin() && box_->NeedsLayout()) { |
| ToLayoutBlockFlow(box_)->LayoutBlockFlow::UpdateBlockLayout(true); |
| } else { |
| box_->ForceLayout(); |
| } |
| } |
| NGLogicalSize box_size(box_->LogicalWidth(), box_->LogicalHeight()); |
| // TODO(kojii): Implement use_first_line_style. |
| NGFragmentBuilder builder(*this, box_->Style(), writing_mode, |
| box_->StyleRef().Direction()); |
| builder.SetIsOldLayoutRoot(); |
| builder.SetInlineSize(box_size.inline_size); |
| builder.SetBlockSize(box_size.block_size); |
| builder.SetPadding(ComputePadding(constraint_space, box_->StyleRef())); |
| |
| // For now we copy the exclusion space straight through, this is incorrect |
| // but needed as not all elements which participate in a BFC are switched |
| // over to LayoutNG yet. |
| // TODO(ikilpatrick): Remove this once the above isn't true. |
| builder.SetExclusionSpace( |
| std::make_unique<NGExclusionSpace>(constraint_space.ExclusionSpace())); |
| |
| CopyBaselinesFromOldLayout(constraint_space, &builder); |
| UpdateShapeOutsideInfoIfNeeded( |
| constraint_space.PercentageResolutionSize().inline_size); |
| return builder.ToBoxFragment(); |
| } |
| |
| void NGBlockNode::CopyBaselinesFromOldLayout( |
| const NGConstraintSpace& constraint_space, |
| NGFragmentBuilder* builder) { |
| const Vector<NGBaselineRequest>& requests = |
| constraint_space.BaselineRequests(); |
| if (requests.IsEmpty()) |
| return; |
| |
| if (UNLIKELY(constraint_space.GetWritingMode() != Style().GetWritingMode())) |
| return; |
| |
| for (const auto& request : requests) { |
| switch (request.algorithm_type) { |
| case NGBaselineAlgorithmType::kAtomicInline: { |
| LayoutUnit position = |
| AtomicInlineBaselineFromOldLayout(request, constraint_space); |
| if (position != -1) |
| builder->AddBaseline(request, position); |
| break; |
| } |
| case NGBaselineAlgorithmType::kFirstLine: { |
| LayoutUnit position = box_->FirstLineBoxBaseline(); |
| if (position != -1) |
| builder->AddBaseline(request, position); |
| break; |
| } |
| } |
| } |
| } |
| |
| LayoutUnit NGBlockNode::AtomicInlineBaselineFromOldLayout( |
| const NGBaselineRequest& request, |
| const NGConstraintSpace& constraint_space) { |
| LineDirectionMode line_direction = box_->IsHorizontalWritingMode() |
| ? LineDirectionMode::kHorizontalLine |
| : LineDirectionMode::kVerticalLine; |
| |
| // If this is an inline box, use |BaselinePosition()|. Some LayoutObject |
| // classes override it assuming inline layout calls |BaselinePosition()|. |
| if (box_->IsInline()) { |
| LayoutUnit position = LayoutUnit(box_->BaselinePosition( |
| request.baseline_type, constraint_space.UseFirstLineStyle(), |
| line_direction, kPositionOnContainingLine)); |
| |
| // BaselinePosition() uses margin edge for atomic inlines. Subtract |
| // margin-over so that the position is relative to the border box. |
| if (box_->IsAtomicInlineLevel()) |
| position -= box_->MarginOver(); |
| |
| return position; |
| } |
| |
| // If this is a block box, use |InlineBlockBaseline()|. When an inline block |
| // has block children, their inline block baselines need to be propagated. |
| return box_->InlineBlockBaseline(line_direction); |
| } |
| |
| // Floats can optionally have a shape area, specifed by "shape-outside". The |
| // current shape machinery requires setting the size of the float after layout |
| // in the parents writing mode. |
| void NGBlockNode::UpdateShapeOutsideInfoIfNeeded( |
| LayoutUnit percentage_resolution_inline_size) { |
| if (!box_->IsFloating() || !box_->GetShapeOutsideInfo()) |
| return; |
| |
| // TODO(ikilpatrick): Ideally this should be moved to a NGLayoutResult |
| // computing the shape area. There may be an issue with the new fragmentation |
| // model and computing the correct sizes of shapes. |
| ShapeOutsideInfo* shape_outside = box_->GetShapeOutsideInfo(); |
| LayoutBlock* containing_block = box_->ContainingBlock(); |
| shape_outside->SetReferenceBoxLogicalSize( |
| containing_block->IsHorizontalWritingMode() |
| ? box_->Size() |
| : box_->Size().TransposedSize()); |
| shape_outside->SetPercentageResolutionInlineSize( |
| percentage_resolution_inline_size); |
| } |
| |
| void NGBlockNode::UseOldOutOfFlowPositioning() { |
| DCHECK(box_->IsOutOfFlowPositioned()); |
| box_->ContainingBlock()->InsertPositionedObject(box_); |
| } |
| |
| // Save static position for legacy AbsPos layout. |
| void NGBlockNode::SaveStaticOffsetForLegacy( |
| const NGLogicalOffset& offset, |
| const LayoutObject* offset_container) { |
| DCHECK(box_->IsOutOfFlowPositioned()); |
| // Only set static position if the current offset container |
| // is one that Legacy layout expects static offset from. |
| const LayoutObject* parent = box_->Parent(); |
| if (parent == offset_container || |
| (parent && parent->IsLayoutInline() && |
| parent->ContainingBlock() == offset_container)) { |
| DCHECK(box_->Layer()); |
| box_->Layer()->SetStaticBlockPosition(offset.block_offset); |
| box_->Layer()->SetStaticInlinePosition(offset.inline_offset); |
| } |
| } |
| |
| void NGBlockNode::StoreMargins(const NGConstraintSpace& constraint_space, |
| const NGBoxStrut& margins) { |
| if (constraint_space.IsIntermediateLayout()) |
| return; |
| NGPhysicalBoxStrut physical_margins = margins.ConvertToPhysical( |
| constraint_space.GetWritingMode(), constraint_space.Direction()); |
| box_->SetMargin(physical_margins); |
| } |
| |
| } // namespace blink |