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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/css/layout_tree_rebuild_root.h"
#include "third_party/blink/renderer/core/dom/document.h"
#include "third_party/blink/renderer/core/dom/element.h"
namespace blink {
Element& LayoutTreeRebuildRoot::RootElement() const {
Node* root_node = GetRootNode();
DCHECK(root_node);
// We need to start from the closest non-dirty ancestor which has a
// LayoutObject to make WhitespaceAttacher work correctly because text node
// siblings of nodes being re-attached needs to be traversed to re-evaluate
// the need for a LayoutText. Single roots are typically dirty, but we need an
// extra check for IsSingleRoot() because we mark nodes which have siblings
// removed with MarkAncestorsWithChildNeedsReattachLayoutTree() in
// StyleEngine::MarkForWhitespaceReattachment(). In that case we need to start
// from the ancestor to traverse all whitespace siblings.
if (IsSingleRoot() || root_node->NeedsReattachLayoutTree() ||
!root_node->GetLayoutObject()) {
do {
root_node = root_node->GetReattachParent();
} while (root_node && !root_node->GetLayoutObject());
}
if (!root_node || root_node->IsDocumentNode())
return *GetRootNode()->GetDocument().documentElement();
return ToElement(*root_node);
}
#if DCHECK_IS_ON()
ContainerNode* LayoutTreeRebuildRoot::Parent(const Node& node) const {
return node.GetReattachParent();
}
bool LayoutTreeRebuildRoot::IsChildDirty(const ContainerNode& node) const {
return node.ChildNeedsReattachLayoutTree();
}
#endif // DCHECK_IS_ON()
bool LayoutTreeRebuildRoot::IsDirty(const Node& node) const {
return node.NeedsReattachLayoutTree();
}
void LayoutTreeRebuildRoot::ClearChildDirtyForAncestors(
ContainerNode& parent) const {
for (ContainerNode* ancestor = &parent; ancestor;
ancestor = ancestor->GetReattachParent()) {
ancestor->ClearChildNeedsReattachLayoutTree();
DCHECK(!ancestor->NeedsReattachLayoutTree());
}
}
} // namespace blink
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