third_party/blink/renderer/core/layout/ng/layout_ng_flexible_box.cc

// Copyright 2018 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/layout_ng_flexible_box.h"

#include "third_party/blink/renderer/core/layout/layout_analyzer.h"
#include "third_party/blink/renderer/core/layout/ng/ng_block_node.h"
#include "third_party/blink/renderer/core/layout/ng/ng_constraint_space.h"
#include "third_party/blink/renderer/core/layout/ng/ng_layout_result.h"
#include "third_party/blink/renderer/core/layout/ng/ng_out_of_flow_positioned_descendant.h"
#include "third_party/blink/renderer/core/layout/ng/ng_physical_box_fragment.h"

namespace blink {

LayoutNGFlexibleBox::LayoutNGFlexibleBox(Element* element)
    : LayoutBlock(element) {}

void LayoutNGFlexibleBox::UpdateBlockLayout(bool relayout_children) {
  LayoutAnalyzer::BlockScope analyzer(*this);

  // TODO(dgrogan): Reuse logic from LayoutNGBlockFlow's
  // UpdateOutOfFlowBlockLayout when this flexbox is out of flow.

  scoped_refptr<NGConstraintSpace> constraint_space =
      NGConstraintSpace::CreateFromLayoutObject(*this);

  scoped_refptr<NGLayoutResult> result =
      NGBlockNode(this).Layout(*constraint_space);

  for (NGOutOfFlowPositionedDescendant descendant :
       result->OutOfFlowPositionedDescendants())
    descendant.node.UseOldOutOfFlowPositioning();

  NGPhysicalBoxFragment* fragment =
      ToNGPhysicalBoxFragment(result->PhysicalFragment().get());

  // Pasted from layout_ng_block_flow. TODO(dgrogan): Factor a utility method.
  const LayoutBlock* containing_block = ContainingBlock();
  NGPhysicalOffset physical_offset;
  if (containing_block) {
    NGPhysicalSize containing_block_size(containing_block->Size().Width(),
                                         containing_block->Size().Height());
    NGLogicalOffset logical_offset(LogicalLeft(), LogicalTop());
    physical_offset = logical_offset.ConvertToPhysical(
        constraint_space->GetWritingMode(), constraint_space->Direction(),
        containing_block_size, fragment->Size());
  }
  fragment->SetOffset(physical_offset);
}

}  // namespace blink