Move container_builder to NGLayoutAlgorithm base class.

third_party/WebKit/Source/core/layout/ng/ng_block_layout_algorithm.cc

 // 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 "core/layout/ng/ng_block_layout_algorithm.h"
 
 #include "core/layout/ng/inline/ng_inline_node.h"
 #include "core/layout/ng/ng_absolute_utils.h"
 #include "core/layout/ng/ng_block_child_iterator.h"
 #include "core/layout/ng/ng_box_fragment.h"
@@ skipping 70 matching lines @@
     NGLogicalOffset mutable_offset(offset);
     AdjustToClearance(space.ClearanceOffset(), &mutable_offset);
     builder->SetBfcOffset(mutable_offset);
   }
 }
 
 NGBlockLayoutAlgorithm::NGBlockLayoutAlgorithm(NGBlockNode* node,
                                                NGConstraintSpace* space,
                                                NGBlockBreakToken* break_token)
     : NGLayoutAlgorithm(node, space, break_token),
-      builder_(NGPhysicalFragment::kFragmentBox, node),
       space_builder_(constraint_space_) {}
 
 Optional<MinMaxContentSize> NGBlockLayoutAlgorithm::ComputeMinMaxContentSize()
     const {
   MinMaxContentSize sizes;
 
   // Size-contained elements don't consider their contents for intrinsic sizing.
   if (Style().ContainsSize())
     return sizes;
 
@@ skipping 27 matching lines @@
   return sizes;
 }
 
 NGLogicalOffset NGBlockLayoutAlgorithm::CalculateLogicalOffset(
     const WTF::Optional<NGLogicalOffset>& known_fragment_offset) {
   LayoutUnit inline_offset =
       border_and_padding_.inline_start + curr_child_margins_.inline_start;
   LayoutUnit block_offset = content_size_;
   if (known_fragment_offset) {
     block_offset = known_fragment_offset.value().block_offset -
-                   builder_.BfcOffset().value().block_offset;
+                   ContainerBfcOffset().block_offset;
   }
   return {inline_offset, block_offset};
 }
 
 RefPtr<NGLayoutResult> NGBlockLayoutAlgorithm::Layout() {
   WTF::Optional<MinMaxContentSize> min_max_size;
   if (NeedMinMaxContentSize(ConstraintSpace(), Style()))
     min_max_size = ComputeMinMaxContentSize();
 
   border_and_padding_ = ComputeBorders(ConstraintSpace(), Style()) +
@@ skipping 10 matching lines @@
   // borders and padding.
   NGLogicalSize adjusted_size(size);
   if (size.block_size == NGSizeIndefinite)
     adjusted_size.inline_size -= border_and_padding_.InlineSum();
   else
     adjusted_size -= border_and_padding_;
 
   space_builder_.SetAvailableSize(adjusted_size)
       .SetPercentageResolutionSize(adjusted_size);
 
-  builder_.SetDirection(constraint_space_->Direction());
-  builder_.SetWritingMode(constraint_space_->WritingMode());
-  builder_.SetSize(size);
+  container_builder_.SetDirection(constraint_space_->Direction());
+  container_builder_.SetWritingMode(constraint_space_->WritingMode());
+  container_builder_.SetSize(size);
 
   NGBlockChildIterator child_iterator(Node()->FirstChild(), BreakToken());
   NGBlockChildIterator::Entry entry = child_iterator.NextChild();
   NGLayoutInputNode* child = entry.node;
   NGBreakToken* child_break_token = entry.token;
 
   // If we are resuming from a break token our start border and padding is
   // within a previous fragment.
   content_size_ = BreakToken() ? LayoutUnit() : border_and_padding_.block_start;
 
   curr_margin_strut_ = ConstraintSpace().MarginStrut();
   curr_bfc_offset_ = ConstraintSpace().BfcOffset();
 
   // Margins collapsing:
   //   Do not collapse margins between parent and its child if there is
   //   border/padding between them.
   if (border_and_padding_.block_start) {
     curr_bfc_offset_.block_offset += curr_margin_strut_.Sum();
     MaybeUpdateFragmentBfcOffset(ConstraintSpace(), curr_bfc_offset_,
-                                 &builder_);
+                                 &container_builder_);
     curr_margin_strut_ = NGMarginStrut();
   }
 
   // If a new formatting context hits the if branch above then the BFC offset is
   // still {} as the margin strut from the constraint space must also be empty.
   if (ConstraintSpace().IsNewFormattingContext()) {
     MaybeUpdateFragmentBfcOffset(ConstraintSpace(), curr_bfc_offset_,
-                                 &builder_);
+                                 &container_builder_);
     DCHECK_EQ(curr_margin_strut_, NGMarginStrut());
-    DCHECK_EQ(builder_.BfcOffset().value(), NGLogicalOffset());
+    DCHECK_EQ(container_builder_.BfcOffset().value(), NGLogicalOffset());
     curr_bfc_offset_ = {};
   }
 
   curr_bfc_offset_.block_offset += content_size_;
 
   while (child) {
     if (child->IsBlock()) {
       EPosition position = child->Style().GetPosition();
       if (position == EPosition::kAbsolute || position == EPosition::kFixed) {
         // TODO(ikilpatrick): curr_margin_strut_ shouldn't be included if there
         // is no content size yet? See floats-wrap-inside-inline-006.
         NGLogicalOffset offset = {border_and_padding_.inline_start,
                                   content_size_ + curr_margin_strut_.Sum()};
-        builder_.AddOutOfFlowChildCandidate(ToNGBlockNode(child), offset);
+        container_builder_.AddOutOfFlowChildCandidate(ToNGBlockNode(child),
+                                                      offset);
         NGBlockChildIterator::Entry entry = child_iterator.NextChild();
         child = entry.node;
         child_break_token = entry.token;
         continue;
       }
     }
 
     PrepareChildLayout(child);
     RefPtr<NGConstraintSpace> child_space =
         CreateConstraintSpaceForChild(child);
@@ skipping 17 matching lines @@
   content_size_ += border_and_padding_.block_end;
   if (border_and_padding_.block_end ||
       ConstraintSpace().IsNewFormattingContext()) {
     content_size_ += curr_margin_strut_.Sum();
     curr_margin_strut_ = NGMarginStrut();
   }
 
   // Recompute the block-axis size now that we know our content size.
   size.block_size =
       ComputeBlockSizeForFragment(ConstraintSpace(), Style(), content_size_);
-  builder_.SetBlockSize(size.block_size);
+  container_builder_.SetBlockSize(size.block_size);
 
   // Layout our absolute and fixed positioned children.
-  NGOutOfFlowLayoutPart(ConstraintSpace(), Style(), &builder_).Run();
+  NGOutOfFlowLayoutPart(ConstraintSpace(), Style(), &container_builder_).Run();
 
   // Non-empty blocks always know their position in space:
   if (size.block_size) {
     curr_bfc_offset_.block_offset += curr_margin_strut_.Sum();
     MaybeUpdateFragmentBfcOffset(ConstraintSpace(), curr_bfc_offset_,
-                                 &builder_);
+                                 &container_builder_);
     PositionPendingFloats(curr_bfc_offset_.block_offset,
-                          MutableConstraintSpace(), &builder_);
+                          MutableConstraintSpace(), &container_builder_);
   }
 
   // Margins collapsing:
   //   Do not collapse margins between the last in-flow child and bottom margin
   //   of its parent if the parent has height != auto()
   if (!Style().LogicalHeight().IsAuto()) {
     // TODO(glebl): handle minLogicalHeight, maxLogicalHeight.
     curr_margin_strut_ = NGMarginStrut();
   }
-  builder_.SetEndMarginStrut(curr_margin_strut_);
+  container_builder_.SetEndMarginStrut(curr_margin_strut_);
 
-  builder_.SetOverflowSize(NGLogicalSize(max_inline_size_, content_size_));
+  container_builder_.SetOverflowSize(
+      NGLogicalSize(max_inline_size_, content_size_));
 
   if (ConstraintSpace().HasBlockFragmentation())
     FinalizeForFragmentation();
 
-  return builder_.ToBoxFragment();
+  return container_builder_.ToBoxFragment();
 }
 
 void NGBlockLayoutAlgorithm::PrepareChildLayout(NGLayoutInputNode* child) {
   DCHECK(child);
 
   // Calculate margins in parent's writing mode.
   curr_child_margins_ = CalculateMargins(
       child, *space_builder_.ToConstraintSpace(
                  FromPlatformWritingMode(Style().GetWritingMode())));
 
   // Set estimated BFC offset to the next child's constraint space.
-  curr_bfc_offset_ = builder_.BfcOffset() ? builder_.BfcOffset().value()
-                                          : ConstraintSpace().BfcOffset();
+  curr_bfc_offset_ = container_builder_.BfcOffset()
+                         ? container_builder_.BfcOffset().value()
+                         : ConstraintSpace().BfcOffset();
   curr_bfc_offset_.block_offset += content_size_;
   curr_bfc_offset_.inline_offset += border_and_padding_.inline_start;
 
   bool is_floating = child->IsBlock() && child->Style().IsFloating();
 
   bool should_position_pending_floats =
       child->IsBlock() && !is_floating &&
       !IsNewFormattingContextForBlockLevelChild(Style(), *child) &&
-      ClearanceMayAffectLayout(ConstraintSpace(), builder_.UnpositionedFloats(),
+      ClearanceMayAffectLayout(ConstraintSpace(),
+                               container_builder_.UnpositionedFloats(),
                                child->Style());
 
   // Children which may clear a float need to force all the pending floats to
   // be positioned before layout. This also resolves the fragment's bfc offset.
   if (should_position_pending_floats) {
     LayoutUnit origin_point_block_offset =
         curr_bfc_offset_.block_offset + curr_margin_strut_.Sum();
     MaybeUpdateFragmentBfcOffset(
         ConstraintSpace(),
-        {curr_bfc_offset_.inline_offset, origin_point_block_offset}, &builder_);
+        {curr_bfc_offset_.inline_offset, origin_point_block_offset},
+        &container_builder_);
     PositionPendingFloats(origin_point_block_offset, MutableConstraintSpace(),
-                          &builder_);
+                          &container_builder_);
   }
 
   bool is_inflow = child->IsInline() || !is_floating;
 
   // Only inflow children (e.g. not floats) are included in the child's margin
   // strut as they do not participate in margin collapsing.
   if (is_inflow) {
     curr_bfc_offset_.inline_offset += curr_child_margins_.inline_start;
     // Append the current margin strut with child's block start margin.
     // Non empty border/padding use cases are handled inside of the child's
@@ skipping 11 matching lines @@
       child->IsInline() ||
       (!is_floating &&
        IsNewFormattingContextForBlockLevelChild(Style(), *child));
 
   // Inline children or children which establish a block formatting context
   // collapse margins and position themselves immediately as they need to know
   // their BFC offset for fragmentation purposes.
   if (should_collapse_margins) {
     curr_bfc_offset_.block_offset += curr_margin_strut_.Sum();
     MaybeUpdateFragmentBfcOffset(ConstraintSpace(), curr_bfc_offset_,
-                                 &builder_);
+                                 &container_builder_);
     PositionPendingFloats(curr_bfc_offset_.block_offset,
-                          MutableConstraintSpace(), &builder_);
+                          MutableConstraintSpace(), &container_builder_);
     curr_margin_strut_ = {};
   }
 }
 
 void NGBlockLayoutAlgorithm::FinishChildLayout(
     NGLayoutInputNode* child,
     NGConstraintSpace* child_space,
     RefPtr<NGLayoutResult> layout_result) {
   NGBoxFragment fragment(
       ConstraintSpace().WritingMode(),
       ToNGPhysicalBoxFragment(layout_result->PhysicalFragment().Get()));
 
   // Pull out unpositioned floats to the current fragment. This may needed if
   // for example the child fragment could not position its floats because it's
   // empty and therefore couldn't determine its position in space.
-  builder_.MutableUnpositionedFloats().AppendVector(
+  container_builder_.MutableUnpositionedFloats().AppendVector(
       layout_result->UnpositionedFloats());
 
   if (child->IsBlock() && child->Style().IsFloating()) {
     NGLogicalOffset origin_offset = constraint_space_->BfcOffset();
     origin_offset.inline_offset += border_and_padding_.inline_start;
     RefPtr<NGFloatingObject> floating_object = NGFloatingObject::Create(
         child->Style(), child_space->WritingMode(),
         child_space->AvailableSize(), origin_offset,
         constraint_space_->BfcOffset(), curr_child_margins_,
         layout_result->PhysicalFragment().Get());
-    builder_.AddUnpositionedFloat(floating_object);
+    container_builder_.AddUnpositionedFloat(floating_object);
     // No need to postpone the positioning if we know the correct offset.
-    if (builder_.BfcOffset()) {
+    if (container_builder_.BfcOffset()) {
       NGLogicalOffset origin_point = curr_bfc_offset_;
       // Adjust origin point to the margins of the last child.
       // Example: <div style="margin-bottom: 20px"><float></div>
       //          <div style="margin-bottom: 30px"></div>
       origin_point.block_offset += curr_margin_strut_.Sum();
       PositionPendingFloats(origin_point.block_offset, MutableConstraintSpace(),
-                            &builder_);
+                            &container_builder_);
     }
     return;
   }
 
   // Determine the fragment's position in the parent space either by using
   // content_size_ or known fragment's BFC offset.
   WTF::Optional<NGLogicalOffset> bfc_offset;
   if (child_space->IsNewFormattingContext()) {
-    DCHECK(builder_.BfcOffset());
     bfc_offset = curr_bfc_offset_;
   } else if (fragment.BfcOffset()) {
     // Fragment that knows its offset can be used to set parent's BFC position.
     curr_bfc_offset_.block_offset = fragment.BfcOffset().value().block_offset;
     MaybeUpdateFragmentBfcOffset(ConstraintSpace(), curr_bfc_offset_,
-                                 &builder_);
+                                 &container_builder_);
     PositionPendingFloats(curr_bfc_offset_.block_offset,
-                          MutableConstraintSpace(), &builder_);
+                          MutableConstraintSpace(), &container_builder_);
     bfc_offset = curr_bfc_offset_;
-  } else if (builder_.BfcOffset()) {
+  } else if (container_builder_.BfcOffset()) {
     // Fragment doesn't know its offset but we can still calculate its BFC
     // position because the parent fragment's BFC is known.
     // Example:
     // BFC Offset is known here because of the padding.
     // <div style="padding: 1px">
     //   <div id="empty-div" style="margins: 1px"></div>
     bfc_offset = curr_bfc_offset_;
     bfc_offset.value().block_offset += curr_margin_strut_.Sum();
   }
   NGLogicalOffset logical_offset = CalculateLogicalOffset(bfc_offset);
 
   // Update margin strut.
   curr_margin_strut_ = fragment.EndMarginStrut();
   curr_margin_strut_.Append(curr_child_margins_.block_end);
 
   // Only modify content_size if BlockSize is not empty. It's needed to prevent
   // the situation when logical_offset is included in content_size for empty
   // blocks. Example:
   //   <div style="overflow:hidden">
   //     <div style="margin-top: 8px"></div>
   //     <div style="margin-top: 10px"></div>
   //   </div>
   if (fragment.BlockSize())
     content_size_ = fragment.BlockSize() + logical_offset.block_offset;
   max_inline_size_ =
       std::max(max_inline_size_, fragment.InlineSize() +
                                      curr_child_margins_.InlineSum() +
                                      border_and_padding_.InlineSum());
 
-  builder_.AddChild(layout_result, logical_offset);
+  container_builder_.AddChild(layout_result, logical_offset);
 }
 
 void NGBlockLayoutAlgorithm::FinalizeForFragmentation() {
   LayoutUnit used_block_size =
       BreakToken() ? BreakToken()->UsedBlockSize() : LayoutUnit();
   LayoutUnit block_size = ComputeBlockSizeForFragment(
       ConstraintSpace(), Style(), used_block_size + content_size_);
 
   block_size -= used_block_size;
   DCHECK_GE(block_size, LayoutUnit())
       << "Adding and subtracting the used_block_size shouldn't leave the "
          "block_size for this fragment smaller than zero.";
 
-  DCHECK(builder_.BfcOffset()) << "We must have our BfcOffset by this point "
-                                  "to determine the space left in the flow.";
   LayoutUnit space_left = ConstraintSpace().FragmentainerSpaceAvailable() -
-                          builder_.BfcOffset().value().block_offset;
+                          ContainerBfcOffset().block_offset;
   DCHECK_GE(space_left, LayoutUnit());
 
-  if (builder_.DidBreak()) {
+  if (container_builder_.DidBreak()) {
     // One of our children broke. Even if we fit within the remaining space we
     // need to prepare a break token.
-    builder_.SetUsedBlockSize(std::min(space_left, block_size) +
-                              used_block_size);
-    builder_.SetBlockSize(std::min(space_left, block_size));
-    builder_.SetBlockOverflow(space_left);
+    container_builder_.SetUsedBlockSize(std::min(space_left, block_size) +
+                                        used_block_size);
+    container_builder_.SetBlockSize(std::min(space_left, block_size));
+    container_builder_.SetBlockOverflow(space_left);
     return;
   }
 
   if (block_size > space_left) {
     // Need a break inside this block.
-    builder_.SetUsedBlockSize(space_left + used_block_size);
-    builder_.SetBlockSize(space_left);
-    builder_.SetBlockOverflow(space_left);
+    container_builder_.SetUsedBlockSize(space_left + used_block_size);
+    container_builder_.SetBlockSize(space_left);
+    container_builder_.SetBlockOverflow(space_left);
     return;
   }
 
   // The end of the block fits in the current fragmentainer.
-  builder_.SetBlockSize(block_size);
-  builder_.SetBlockOverflow(content_size_);
+  container_builder_.SetBlockSize(block_size);
+  container_builder_.SetBlockOverflow(content_size_);
 }
 
 NGBoxStrut NGBlockLayoutAlgorithm::CalculateMargins(
     NGLayoutInputNode* child,
     const NGConstraintSpace& space) {
   DCHECK(child);
   const ComputedStyle& child_style = child->Style();
 
   WTF::Optional<MinMaxContentSize> sizes;
   if (NeedMinMaxContentSize(space, child_style))
@@ skipping 38 matching lines @@
   space_builder_.SetMarginStrut(child_style.IsFloating() ? NGMarginStrut()
                                                          : curr_margin_strut_);
 
   LayoutUnit space_available;
   if (constraint_space_->HasBlockFragmentation()) {
     space_available = ConstraintSpace().FragmentainerSpaceAvailable();
     // If a block establishes a new formatting context we must know our
     // position in the formatting context, and are able to adjust the
     // fragmentation line.
     if (is_new_bfc) {
-      DCHECK(builder_.BfcOffset());
       space_available -= curr_bfc_offset_.block_offset;
     }
   }
   space_builder_.SetFragmentainerSpaceAvailable(space_available);
 
   return space_builder_.ToConstraintSpace(
       FromPlatformWritingMode(child_style.GetWritingMode()));
 }
 }  // namespace blink