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// 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/layout_object_factory.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/layout/layout_block_flow.h"
#include "third_party/blink/renderer/core/layout/layout_flexible_box.h"
#include "third_party/blink/renderer/core/layout/layout_list_item.h"
#include "third_party/blink/renderer/core/layout/layout_table_caption.h"
#include "third_party/blink/renderer/core/layout/layout_table_cell.h"
#include "third_party/blink/renderer/core/layout/layout_view.h"
#include "third_party/blink/renderer/core/layout/ng/layout_ng_block_flow.h"
#include "third_party/blink/renderer/core/layout/ng/layout_ng_flexible_box.h"
#include "third_party/blink/renderer/core/layout/ng/layout_ng_table_caption.h"
#include "third_party/blink/renderer/core/layout/ng/layout_ng_table_cell.h"
#include "third_party/blink/renderer/core/layout/ng/list/layout_ng_list_item.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
namespace blink {
namespace {
inline bool ShouldUseNewLayout(Document& document, const ComputedStyle& style) {
if (!RuntimeEnabledFeatures::LayoutNGEnabled())
return false;
bool requires_ng_block_fragmentation =
document.Printing() ||
(document.GetLayoutView() &&
document.GetLayoutView()->StyleRef().IsOverflowPaged());
if (requires_ng_block_fragmentation &&
!RuntimeEnabledFeatures::LayoutNGBlockFragmentationEnabled())
return false;
return !style.ForceLegacyLayout();
}
inline Element* GetElementForLayoutObject(Node& node) {
if (node.IsElementNode())
return &ToElement(node);
// If |node| is a Document, the layout object is going to be anonymous.
DCHECK(node.IsDocumentNode());
return nullptr;
}
} // anonymous namespace
LayoutBlockFlow* LayoutObjectFactory::CreateBlockFlow(
Node& node,
const ComputedStyle& style) {
Element* element = GetElementForLayoutObject(node);
if (ShouldUseNewLayout(node.GetDocument(), style))
return new LayoutNGBlockFlow(element);
return new LayoutBlockFlow(element);
}
LayoutBlock* LayoutObjectFactory::CreateFlexibleBox(
Node& node,
const ComputedStyle& style) {
Element* element = GetElementForLayoutObject(node);
if (RuntimeEnabledFeatures::LayoutNGFlexBoxEnabled() &&
ShouldUseNewLayout(node.GetDocument(), style))
return new LayoutNGFlexibleBox(element);
return new LayoutFlexibleBox(element);
}
LayoutBlockFlow* LayoutObjectFactory::CreateListItem(
Node& node,
const ComputedStyle& style) {
Element* element = GetElementForLayoutObject(node);
if (ShouldUseNewLayout(node.GetDocument(), style))
return new LayoutNGListItem(element);
return new LayoutListItem(element);
}
LayoutTableCaption* LayoutObjectFactory::CreateTableCaption(
Node& node,
const ComputedStyle& style) {
Element* element = GetElementForLayoutObject(node);
if (ShouldUseNewLayout(node.GetDocument(), style))
return new LayoutNGTableCaption(element);
return new LayoutTableCaption(element);
}
LayoutTableCell* LayoutObjectFactory::CreateTableCell(
Node& node,
const ComputedStyle& style) {
Element* element = GetElementForLayoutObject(node);
if (ShouldUseNewLayout(node.GetDocument(), style))
return new LayoutNGTableCell(element);
return new LayoutTableCell(element);
}
} // namespace blink
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