third_party/WebKit/Source/core/layout/ng/ng_layout_input_node.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_layout_input_node.h"

#include "core/layout/ng/ng_block_layout_algorithm.h"
#include "core/layout/ng/ng_block_node.h"
#include "core/layout/ng/ng_constraint_space.h"
#include "core/layout/ng/ng_inline_layout_algorithm.h"
#include "core/layout/ng/ng_inline_node.h"
#include "core/layout/ng/ng_layout_algorithm.h"
#include "core/layout/ng/ng_legacy_block_layout_algorithm.h"
#include "core/style/ComputedStyle.h"

namespace blink {

NGLayoutAlgorithm* NGLayoutInputNode::AlgorithmForInputNode(
    NGLayoutInputNode* input_node,
    NGConstraintSpace* constraint_space) {
  // At least for now, this should never be called on LegacyInline
  // children. However, there will be other kinds of input_node so
  // it makes sense to do this here.
  DCHECK(input_node->Type() == kLegacyBlock);
  NGBlockNode* block = toNGBlockNode(input_node);
  if (!block->CanUseNewLayout())
    return new NGLegacyBlockLayoutAlgorithm(block, constraint_space);
  const ComputedStyle& style = block->Style();
  LayoutObject* layout_object = input_node->GetLayoutObject();
  if (block->HasInlineChildren()) {
    NGInlineNode* child = toNGInlineNode(block->FirstChild());
    return new NGInlineLayoutAlgorithm(layout_object, &style, child,
                                       constraint_space);
  }
  NGBlockNode* child = toNGBlockNode(block->FirstChild());
  // TODO(layout-ng): The break token should be passed as an argument to this
  // method instead of getting it from the NGBlockNode
  NGBreakToken* token = block->CurrentBreakToken();
  return new NGBlockLayoutAlgorithm(layout_object, &style, child,
                                    constraint_space, token);
}
}