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* Copyright (C) 2005 Allan Sandfeld Jensen (
* Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* Library General Public License for more details.
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
#ifndef CounterNode_h
#define CounterNode_h
#include "platform/wtf/Forward.h"
#include "platform/wtf/RefCounted.h"
// This implements a counter tree that is used for finding parents in counters()
// lookup, and for propagating count changes when nodes are added or removed.
// Parents represent unique counters and their scope, which are created either
// explicitly by "counter-reset" style rules or implicitly by referring to a
// counter that is not in scope.
// Such nodes are tagged as "reset" nodes, although they are not all due to
// "counter-reset".
// Not that layout tree children are often counter tree siblings due to counter
// scoping rules.
namespace blink {
class LayoutObject;
class LayoutCounter;
class CounterNode : public RefCounted<CounterNode> {
static scoped_refptr<CounterNode> Create(LayoutObject&,
bool is_reset,
int value);
bool ActsAsReset() const { return has_reset_type_ || !parent_; }
bool HasResetType() const { return has_reset_type_; }
int Value() const { return value_; }
int CountInParent() const { return count_in_parent_; }
LayoutObject& Owner() const { return owner_; }
void AddLayoutObject(LayoutCounter*);
void RemoveLayoutObject(LayoutCounter*);
// Invalidates the text in the layoutObjects of this counter, if any.
void ResetLayoutObjects();
CounterNode* Parent() const { return parent_; }
CounterNode* PreviousSibling() const { return previous_sibling_; }
CounterNode* NextSibling() const { return next_sibling_; }
CounterNode* FirstChild() const { return first_child_; }
CounterNode* LastChild() const { return last_child_; }
CounterNode* LastDescendant() const;
CounterNode* PreviousInPreOrder() const;
CounterNode* NextInPreOrder(const CounterNode* stay_within = nullptr) const;
CounterNode* NextInPreOrderAfterChildren(
const CounterNode* stay_within = nullptr) const;
void InsertAfter(CounterNode* new_child,
CounterNode* before_child,
const AtomicString& identifier);
// identifier must match the identifier of this counter.
void RemoveChild(CounterNode*);
// Moves all non-reset next siblings of first_node to be children of
// new_parent. Used when we insert new reset nodes that requires reparenting
// existing nodes.
static void MoveNonResetSiblingsToChildOf(CounterNode* first_node,
CounterNode& new_parent,
const AtomicString& identifier);
CounterNode(LayoutObject&, bool is_reset, int value);
int ComputeCountInParent() const;
// Invalidates the text in the layoutObject of this counter, if any,
// and in the layoutObjects of all descendants of this counter, if any.
void ResetThisAndDescendantsLayoutObjects();
void Recount();
bool has_reset_type_;
int value_;
int count_in_parent_;
LayoutObject& owner_;
LayoutCounter* root_layout_object_;
CounterNode* parent_;
CounterNode* previous_sibling_;
CounterNode* next_sibling_;
CounterNode* first_child_;
CounterNode* last_child_;
} // namespace blink
#ifndef NDEBUG
// Outside the WebCore namespace for ease of invocation from gdb.
void showCounterTree(const blink::CounterNode*);
#endif // CounterNode_h