[LayoutNG] Add NGLineBoxFragment

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

+// Copyright 2017 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_line_box_fragment_builder.h"
+
+#include "core/layout/ng/geometry/ng_logical_size.h"
+#include "core/layout/ng/ng_fragment.h"
+#include "core/layout/ng/ng_inline_node.h"
+#include "core/layout/ng/ng_physical_line_box_fragment.h"
+#include "platform/heap/Handle.h"
+
+namespace blink {
+
+NGLineBoxFragmentBuilder::NGLineBoxFragmentBuilder(NGInlineNode* node)
+    : direction_(TextDirection::kLtr), node_(node) {}
+
+NGLineBoxFragmentBuilder& NGLineBoxFragmentBuilder::SetDirection(
+    TextDirection direction) {
+  direction_ = direction;
+  return *this;
+}
+
+NGLineBoxFragmentBuilder& NGLineBoxFragmentBuilder::SetInlineSize(
+    LayoutUnit size) {
+  inline_size_ = size;
+  return *this;
+}
+
+NGLineBoxFragmentBuilder& NGLineBoxFragmentBuilder::AddChild(
+    RefPtr<NGPhysicalFragment> child,
+    const NGLogicalOffset& child_offset) {
+  children_.push_back(std::move(child));
+  offsets_.push_back(child_offset);
+
+  return *this;
+}
+
+void NGLineBoxFragmentBuilder::MoveChildrenInBlockDirection(LayoutUnit delta) {
+  for (auto& offset : offsets_)
+    offset.block_offset += delta;
+}
+
+void NGLineBoxFragmentBuilder::UniteMetrics(
+    const NGLineHeightMetrics& metrics) {
+  metrics_.Unite(metrics);
+}
+
+RefPtr<NGPhysicalLineBoxFragment>
+NGLineBoxFragmentBuilder::ToLineBoxFragment() {
+  DCHECK_EQ(offsets_.size(), children_.size());
+
+  NGWritingMode writing_mode(
+      FromPlatformWritingMode(node_->BlockStyle()->getWritingMode()));
+  NGPhysicalSize physical_size =
+      NGLogicalSize(inline_size_, Metrics().LineHeight())
+          .ConvertToPhysical(writing_mode);
+
+  for (size_t i = 0; i < children_.size(); ++i) {
+    NGPhysicalFragment* child = children_[i].get();
+    child->SetOffset(offsets_[i].ConvertToPhysical(
+        writing_mode, direction_, physical_size, child->Size()));
+  }
+
+  // TODO(kojii): Implement BreakToken.
+  return adoptRef(new NGPhysicalLineBoxFragment(physical_size, children_,
+                                                metrics_, nullptr));
+}
+
+}  // namespace blink